WO1995009490A1 - Using two classes of channels with different capacity - Google Patents

Using two classes of channels with different capacity Download PDF

Info

Publication number
WO1995009490A1
WO1995009490A1 PCT/SE1994/000880 SE9400880W WO9509490A1 WO 1995009490 A1 WO1995009490 A1 WO 1995009490A1 SE 9400880 W SE9400880 W SE 9400880W WO 9509490 A1 WO9509490 A1 WO 9509490A1
Authority
WO
WIPO (PCT)
Prior art keywords
channels
class
mobile station
channel
base station
Prior art date
Application number
PCT/SE1994/000880
Other languages
French (fr)
Inventor
Ulf FORSSÉN
Björn Gudmundson
Original Assignee
Telefonaktiebolaget Lm Ericsson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson filed Critical Telefonaktiebolaget Lm Ericsson
Priority to CA2148940A priority Critical patent/CA2148940A1/en
Priority to DE69433983T priority patent/DE69433983T2/en
Priority to JP7510248A priority patent/JPH08508865A/en
Priority to KR1019950702126A priority patent/KR100344503B1/en
Priority to NZ274026A priority patent/NZ274026A/en
Priority to EP94928540A priority patent/EP0671085B1/en
Priority to AU77935/94A priority patent/AU677717B2/en
Publication of WO1995009490A1 publication Critical patent/WO1995009490A1/en
Priority to FI952582A priority patent/FI952582A0/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources

Definitions

  • the present invention relates to a cellular communication system with adaptive antenna arrays, and more specifically to a cellular communication system which uses both wide adaptive antenna lobes and narrow adaptive antenna lobes for com ⁇ munication between base stations and mobile stations.
  • This object of the present invention is accomplished by using antenna arrays and by dividing the available traffic channels into a plurality of classes.
  • One embodiment of the present invention discloses a method of transmitting and receiving signals in a base station with an antenna array in a cellular communication system.
  • the available communication channels are divided into a plurality of classes.
  • the base station then transmits signals to mobile stations in a first class of channels with a wide antenna lobe.
  • the position of a mobile station can then be determined from signals received at the base station from the mobile station.
  • the base station can transmit signals to and receive signals from the mobile station in a second class of channels with a narrow antenna lobe.
  • Figure 1 illustrates a block diagram of the relationship between the transmitter and the receiver
  • Figures 2(a)-(b) illustrates one antenna arrangement accor ⁇ ding to one embodiment of the present invention
  • Figure 3 is a flow chart of a call set up routine according to one embodiment of the present invention
  • Figure 4 illustrates an example of beam-forming according to one embodiment of the present invention
  • Figure 5 illustrates a flow chart for detecting and demodulat- ing a signal according to one embodiment of the present invention
  • Figure 6 illustrates a block diagram of one embodiment of a part of the present invention
  • FIG. 7(a)-(b) illustrates another antenna arrangement according to one embodiment of the present invention.
  • Figure 8 is a flow chart of a handover routine between base stations accordingto one embodiment of the present invention.
  • Figure 1 illustrates an overview picture of the link between a transmitter 10 and a receiver 14.
  • the transmitter and receiver are located in both the mobile station and the base stations, however for this discussion the transmitter 10 is in the mobile station and the receiver 14 is located at the base station.
  • the transmitter 10 sends a signal to the receiver 14 through a channel 12.
  • the channel 12 is considered to be a linear transfer function with an impulse response h(t) which creates all the variations and phase and signal strength between the transmitter and the receiver.
  • the transmitted signal s(t) is affected by the channel impulse response h(t) to form a received signal r(t) .
  • the signal r(t) is received by the receiver 14 through an adaptive antenna array 20 which feeds the received signal into a channel estimator 16 which calculates a discrete approximation to h(t) called h(n) .
  • the discrete approximation h(n) is then fed into the fading frequency estimator 18 which produces an estimate of the doppler frequency for the mobile station.
  • the received signal is also feed into a demodulator/detector 22 which uses the channel estimate and a doppler frequency estimate to demodu ⁇ late and detec ⁇ _-Jt__e signal s
  • the number of available traffic channels are divided into a plurality of groups or classes, for instance, two.
  • the first class of channels has a disturbance situation so that the base station can receive signals using wide antenna lobes and transmit signals to the mobile station using a wide antenna lobe.
  • the second class of channels has a disturbance situation so that the base station must transmit signals using narrow antenna lobes in order to obtain acceptable quality.
  • the difference between the channel classes is that a narrow lobe channel where the base station transmits signals in a narrow antenna lobe has a significantly higher spectral efficiency. The higher spectral efficiency can typically be used to reduce the frequency reuse or to enable multiple spatial separated users to communicate over the same channel.
  • control channel and some of the traffic channels should be class one channels while most of the traffic channels should be class two channels.
  • class one channels should use the same reuse distance and receiver algorithms as are presently available today, while the class two channels can have a smaller reuse distance than the class one channels.
  • Figure 2(a) illustrates a wide lobe channel.
  • the channel fl is broadcast over a wide area so that a plurality of mobile stations can receive broadcast messages from the base station independently of their posi ⁇ tion.
  • Figure 2(b) illustrates a narrow lobe channel according to one embodiment of the present invention.
  • the channel f2 is broadcasted to a limited area using the spatial filters of the adaptive antenna array to limit the direction of channel f2.
  • the channel f2 can be used by a plurality of mobile stations to transmit and receive individual messages, so long the mobile stations are not located in the same vicinity.
  • a base station transmits broadcast information, control messages, and paging messages on a wide lobe downlink channel.
  • the base station also listens to all of the mobile stations in its assigned geographical area on a wide lobe uplink channel where, for example, mobile stations can send access requests to the base station.
  • the base station collects the signals from the surrounding area at the antenna array. The collected signals are then entered into a signal processor which evaluates all of the individual signals to detect the presence of a mobile station and to measure the position of the mobile station.
  • the base station can then use these position measurements to reduce the width of the antenna lobe used to send signals to particular mobile stations, i.e., assign the mobile station a class two channel, after the position of the mobile station is determined to be above a predetermined level of certainty.
  • Class one channels are also used for setting up a new call and for handover between base stations.
  • a typical call set up routine is illustrated in Figure 3.
  • a mobile station sends an access message on a random access control channel, which is a class one channel, to a base station in step 300.
  • the message sequence (d(K) ⁇ ,” can for example be used as the desired signal in a least-squares problem as follows.
  • the linear combination of X(K) closest to d(K) is determined, in other words, the vector W is determined so that (d lc -W H X
  • the base station assigns the mobile station an available class one channel for the re- quested call in step 304. The position of the mobile station can then be measured while the mobile station uses the class one channel to transmit data.
  • the position of the mobile station can, for example, be characterized by the previously determined vector W 0 . It is also possible to determine a direction of arrival of the signal from the mobile station using well known algorithms such as beam-forming, MUSIC, ESPRIT, and WSF.
  • An example of beam-forming is illustrated in Figure 4.
  • the signal from a mobile station is received in a number of lobes, for example, four lobes.
  • the beam-forming could, for example, be done with four separate directional antennas 402, with a Butler beam- former 404 on the radio freguency signal or at base band with digital filters.
  • Figure 5 illustrates one process for detecting and demodulating a signal from a mobile station. In step 500, a signal from a mobile station is received at the antenna array 402.
  • Lobes are then formed in step 502 and the output power from each of the lobes is measured in step 504.
  • the lobe with the largest measured power is then selected as the best lobe in step 506.
  • the lobe number i.e., 1,2,3,4, is then a characterization of the position of the mobile station.
  • the desired signal is then filtered out in step 508 and the signal is detected and demodulated in step 510.
  • the resulting signal is then checked to see if it is useable, for example, has sufficient signal strength, in step 512. If the signal is not useable, the selected lobe is marked as used in step 514 and the routine returns to step 502.
  • Figure 6 illustrates one method for measuring the power of signals received from mobile station MSI.
  • the array of antennas 602 receive a plurality of signals, some of which are from MSI.
  • the plurality of signals are then filtered in a spatial filter 604.
  • the spatial filtering can reduce inter ⁇ ference from other directions in the uplink direction. It can also reduce the downlink disturbance from the base station towards the mobile station.
  • the weights of the spatial filter W,, W 2 , W 3 , and W 4 are chosen so that the filtered signal Y(K) consists solely of the signals received from the mobile station MSI.
  • the weight of the spatial filter are chosen so that all of the signals for MSI reach MSI without disturbing MS2.
  • the filtered signal Y(K) is then squared in a squaring means 606 to produce the momentaneous power of the mobile station MSI.
  • the momentaneous power is then averaged in time in an integrator 408 to produce the time averaged power of the mobile station MSI.
  • the mobile station can then be assigned a class two channel in step 308.
  • Traffic to and from mobiles with known positions can be directed in specific directions using narrow antenna lobes. As a result, interference is reduced and multiple mobiles can use the same frequency channel.
  • a single frequency channel can have up to 5 users at the same time but is not limited thereto.
  • a mobile that wants to access an AMPS-type FDMA system would typically send its access request or call setup request to a base station using a widelobe channel as indicated in Figure 2(a). The signal is processed by the base station and the mobile's position can then be measured. The mobile is then instructed to transmit and receive on a narrow band channel as illustrated in Figure 2(b) .
  • An active mobile in a ADC-type TDMA system would, as illustrated in Figure 7(a)-(b), typically use one time slot for transmission to the base station and another timeslot for reception from the base station. This transmission would typically use narrowlobe channels with high spectral ef ⁇ ficiency as illustrated in Figure 7a. The mobile is then free for the rest of the time slots to listen for information broadcasted from base stations in the general vicinity on widelobe channels as illustrated in Figure 7b.
  • a typical call handover routine is illustrated in Figure 8.
  • a first base station determines that a handover is required using one of the methods that are well known to one of ordinary skill in the art in step 800
  • the first base station hands off the mobile station to a second base station in step 802.
  • the second base station assigns the mobile station an available class one channel in step 804 so that the mobile station can continue the call in progress.
  • the position of the mobile station is then gradually determined by either the base station or the mobile station in step 806.
  • the second base station the assigns the mobile station an available class two traffic channel in step 808.
  • the mobile station canmake handovermeasurements bymonitoring the class one channels as long as the signals are separated in time.
  • the class two channels have antenna lobes with variable widths, wherein all of the widths of the antenna lobes of class two channels are less than the width of antenna lobes of class one channels.

Abstract

A method and apparatus for transmitting and receiving signals in a base station with an antenna array in a cellular communication system. The available communication channels are divided into a plurality of classes. The base station transmits signals to the mobile station in a first class of channels in a wide antenna lobe. The position of a mobile station can then be determined from signals received at the base station from the mobile station. After the position of the mobile station has been determined, the base station can transmit signals to and receive signals from the mobile station in a second class channel with a narrow antenna lobe.

Description

USING TWO CLASSES OF CHANNELS WITH DIFFERENT CAPACITY
FIELD OF THE INVENTION
The present invention relates to a cellular communication system with adaptive antenna arrays, and more specifically to a cellular communication system which uses both wide adaptive antenna lobes and narrow adaptive antenna lobes for com¬ munication between base stations and mobile stations.
BACKGROUND OF THE INVENTION
The cellular industry has made phenomenal strides in commer- cial operations in the United States as well as the rest of the world. Growth in major metropolitan areas has far exceeded expectations and is outstripping system capacity. If this trend continues, the effects of rapid growth will soon be achieved in the smallest markets. Innovative solutions are required to meet these increasing capacity needs as well as to maintain high quality service and avoid rising prices. Furthermore, as the number of cellular users increases, the problems associated with co-channel interference become of increased importance.
Current digital cellular systems employ base stations which separate mobile signals using time and frequency ort¬ hogonality. Signals from a mobile propagate to a base station and the signals are received in a single or sometimes double antenna. The receiver processes the signal using time and frequency orthogonality to separate signals from different users. It is then possible to equalize and detect the signals. While techniques such as frequency hopping and advanced coding techniques provide ways for lowering co- channel interference, they are inherently limited by the available frequency spectrum. However, the use of the directional sensitivity of adaptive antennas offers a new way of reducing co-channel interference. An adaptive antenna consists of an array of spatially distributed antennas. Impinging on the array are signals from several transmitters. By properly combining the antenna outputs, it is possible to extract individual signals from the received superposition, even if they occupy the same frequency band. It is then possible to distinguish between spatially separated users by using narrow adaptive antenna lobes. This can be viewed as a way to utilize orthogonality in the spatial dimension.
Current digital cellular systems also employ base stations which use base antennas with wide antenna lobes, i.e., approximately 60, 120 or 360°. The base station receives signals from all mobile stations within the lobe. It is hence not necessary to know the position of the mobile station. However, it is not possible to suppress mobiles transmitting from other angles. The use of narrow adaptive antenna lobes requires that the position or more exactly, the best spatial filters for reception/transmission to and from the mobile station be known. This implies that the spatial filters of the mobile must be measured for each new call and after each handover between base stations.
This measurement problem can be easily solved in many ap¬ plications. However, the problem is much more important in cellular mobile applications where the mobile stations change position and where communication channels fade quickly. Furthermore, existing standards such as the GSM standard often assume that a wide antenna lobe is used so that valuable information can be sent directly to mobile stations with unknown positions. This implies that special care must be taken so that information is not lost during the training of the adaptive antennas. Another consideration is the linking to a channel, i.e., the fact that a mobile can be assigned to one of a number of time and/or frequency orthogonal channels. A new mobile may not be appropriate for a specific channel since, for example, it is close to an old mobile on the same channel. There is hence a desire to first measure, without disturbing any traffic, and then to link the mobile to an appropriate channel. In other words, one should maximize the spatial orthogonality.
Another important consideration is handover measurements. There is a desire to have some channels transmitted in a wide lobe so that the mobile station can measure the signal strength of the signal from the base stations.
SUMMARY OF THE DISCLOSURE
It is an object of the present invention to provide a system wherein mobile stations with known and unknown positions can be used in the same system while the knowledge about the mobile's position at the same time can be utilized to reduce interference and increase system capacity. This object of the present invention is accomplished by using antenna arrays and by dividing the available traffic channels into a plurality of classes.
One embodiment of the present invention discloses a method of transmitting and receiving signals in a base station with an antenna array in a cellular communication system. First, the available communication channels are divided into a plurality of classes. The base station then transmits signals to mobile stations in a first class of channels with a wide antenna lobe. The position of a mobile station can then be determined from signals received at the base station from the mobile station. After the position of the mobile station has been determined, the base station can transmit signals to and receive signals from the mobile station in a second class of channels with a narrow antenna lobe. BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described in more detail with reference to preferred embodiments of the present invention, given only by way of example, and illustrated in the accompanying drawings in which;
Figure 1 illustrates a block diagram of the relationship between the transmitter and the receiver;
Figures 2(a)-(b) illustrates one antenna arrangement accor¬ ding to one embodiment of the present invention; Figure 3 is a flow chart of a call set up routine according to one embodiment of the present invention;
Figure 4 illustrates an example of beam-forming according to one embodiment of the present invention;
Figure 5 illustrates a flow chart for detecting and demodulat- ing a signal according to one embodiment of the present invention;
Figure 6 illustrates a block diagram of one embodiment of a part of the present invention;
Figure 7(a)-(b) illustrates another antenna arrangement according to one embodiment of the present invention; and
Figure 8 is a flow chart of a handover routine between base stations accordingto one embodiment of the present invention.
DETAILED DESCRIPTION
While the following description is in the context of cellular communication systems involving portable or mobile radio telephones and/or personal communication networks and a plurality of base stations, it will be understood by those skilled in the arts that the present invention may be applied to other communications applications.
Figure 1 illustrates an overview picture of the link between a transmitter 10 and a receiver 14. The transmitter and receiver are located in both the mobile station and the base stations, however for this discussion the transmitter 10 is in the mobile station and the receiver 14 is located at the base station. The transmitter 10 sends a signal to the receiver 14 through a channel 12. The channel 12 is considered to be a linear transfer function with an impulse response h(t) which creates all the variations and phase and signal strength between the transmitter and the receiver. The transmitted signal s(t) is affected by the channel impulse response h(t) to form a received signal r(t) . The signal r(t) is received by the receiver 14 through an adaptive antenna array 20 which feeds the received signal into a channel estimator 16 which calculates a discrete approximation to h(t) called h(n) . The discrete approximation h(n) is then fed into the fading frequency estimator 18 which produces an estimate of the doppler frequency for the mobile station. The received signal is also feed into a demodulator/detector 22 which uses the channel estimate and a doppler frequency estimate to demodu¬ late and detec{ _-Jt__e signal s
According to one embodiment of the present invention, the number of available traffic channels are divided into a plurality of groups or classes, for instance, two. According to one embodiment of the present invention, the first class of channels has a disturbance situation so that the base station can receive signals using wide antenna lobes and transmit signals to the mobile station using a wide antenna lobe. The second class of channels has a disturbance situation so that the base station must transmit signals using narrow antenna lobes in order to obtain acceptable quality. The difference between the channel classes is that a narrow lobe channel where the base station transmits signals in a narrow antenna lobe has a significantly higher spectral efficiency. The higher spectral efficiency can typically be used to reduce the frequency reuse or to enable multiple spatial separated users to communicate over the same channel. Typically, the control channel and some of the traffic channels should be class one channels while most of the traffic channels should be class two channels. Furthermore, the class one channels should use the same reuse distance and receiver algorithms as are presently available today, while the class two channels can have a smaller reuse distance than the class one channels.
Figure 2(a) illustrates a wide lobe channel. As is illustrated, the channel fl is broadcast over a wide area so that a plurality of mobile stations can receive broadcast messages from the base station independently of their posi¬ tion. Figure 2(b) illustrates a narrow lobe channel according to one embodiment of the present invention. As is illustra¬ ted, the channel f2 is broadcasted to a limited area using the spatial filters of the adaptive antenna array to limit the direction of channel f2. As a result, the channel f2 can be used by a plurality of mobile stations to transmit and receive individual messages, so long the mobile stations are not located in the same vicinity.
According to one embodiment of the present invention, a base station transmits broadcast information, control messages, and paging messages on a wide lobe downlink channel. The base station also listens to all of the mobile stations in its assigned geographical area on a wide lobe uplink channel where, for example, mobile stations can send access requests to the base station. The base station collects the signals from the surrounding area at the antenna array. The collected signals are then entered into a signal processor which evaluates all of the individual signals to detect the presence of a mobile station and to measure the position of the mobile station. The base station can then use these position measurements to reduce the width of the antenna lobe used to send signals to particular mobile stations, i.e., assign the mobile station a class two channel, after the position of the mobile station is determined to be above a predetermined level of certainty.
Class one channels are also used for setting up a new call and for handover between base stations. A typical call set up routine according to one embodiment of the present invention is illustrated in Figure 3. First, a mobile station sends an access message on a random access control channel, which is a class one channel, to a base station in step 300. The message is detected and used as a training sequence for the antenna algorithm, in step 302, by demoting the vector signal from the antenna array at time K as X(K)=[X, (K) ...XL(K) ]τ where L is the number of array elements. The message sequence (d(K) },", can for example be used as the desired signal in a least-squares problem as follows. First, the linear combination of X(K) closest to d(K) is determined, in other words, the vector W is determined so that (dlc-WHX|()2 is minimized. The determined vector, W0, where W0 = [W...W2]τ, can then be used to filter out the signal from the mobile. The base station then assigns the mobile station an available class one channel for the re- quested call in step 304. The position of the mobile station can then be measured while the mobile station uses the class one channel to transmit data.
The position of the mobile station can, for example, be characterized by the previously determined vector W0. It is also possible to determine a direction of arrival of the signal from the mobile station using well known algorithms such as beam-forming, MUSIC, ESPRIT, and WSF. An example of beam-forming is illustrated in Figure 4. The signal from a mobile station is received in a number of lobes, for example, four lobes. The beam-forming could, for example, be done with four separate directional antennas 402, with a Butler beam- former 404 on the radio freguency signal or at base band with digital filters. Figure 5 illustrates one process for detecting and demodulating a signal from a mobile station. In step 500, a signal from a mobile station is received at the antenna array 402. Lobes are then formed in step 502 and the output power from each of the lobes is measured in step 504. The lobe with the largest measured power is then selected as the best lobe in step 506. The lobe number, i.e., 1,2,3,4, is then a characterization of the position of the mobile station. The desired signal is then filtered out in step 508 and the signal is detected and demodulated in step 510. The resulting signal is then checked to see if it is useable, for example, has sufficient signal strength, in step 512. If the signal is not useable, the selected lobe is marked as used in step 514 and the routine returns to step 502.
Figure 6 illustrates one method for measuring the power of signals received from mobile station MSI. The array of antennas 602 receive a plurality of signals, some of which are from MSI. The plurality of signals are then filtered in a spatial filter 604. The spatial filtering can reduce inter¬ ference from other directions in the uplink direction. It can also reduce the downlink disturbance from the base station towards the mobile station. In the uplink direction, the weights of the spatial filter W,, W2, W3, and W4 are chosen so that the filtered signal Y(K) consists solely of the signals received from the mobile station MSI. In the downlink direction, the weight of the spatial filter are chosen so that all of the signals for MSI reach MSI without disturbing MS2. The filtered signal Y(K) is then squared in a squaring means 606 to produce the momentaneous power of the mobile station MSI. The momentaneous power is then averaged in time in an integrator 408 to produce the time averaged power of the mobile station MSI. Returning to Figure 3, as soon as the position and power level of the new mobile are determined in step 306, the mobile station can then be assigned a class two channel in step 308.
Traffic to and from mobiles with known positions can be directed in specific directions using narrow antenna lobes. As a result, interference is reduced and multiple mobiles can use the same frequency channel. According to one embodiment of the present invention, a single frequency channel can have up to 5 users at the same time but is not limited thereto. A mobile that wants to access an AMPS-type FDMA system would typically send its access request or call setup request to a base station using a widelobe channel as indicated in Figure 2(a). The signal is processed by the base station and the mobile's position can then be measured. The mobile is then instructed to transmit and receive on a narrow band channel as illustrated in Figure 2(b) .
An active mobile in a ADC-type TDMA system would, as illustrated in Figure 7(a)-(b), typically use one time slot for transmission to the base station and another timeslot for reception from the base station. This transmission would typically use narrowlobe channels with high spectral ef¬ ficiency as illustrated in Figure 7a. The mobile is then free for the rest of the time slots to listen for information broadcasted from base stations in the general vicinity on widelobe channels as illustrated in Figure 7b.
A typical call handover routine according to one embodiment of the present invention is illustrated in Figure 8. When a first base station determines that a handover is required using one of the methods that are well known to one of ordinary skill in the art in step 800, the first base station hands off the mobile station to a second base station in step 802. The second base station then assigns the mobile station an available class one channel in step 804 so that the mobile station can continue the call in progress. The position of the mobile station is then gradually determined by either the base station or the mobile station in step 806. The second base station the assigns the mobile station an available class two traffic channel in step 808. Furthermore, according to one embodiment of the present invention, while the mobile station is transmitting on a class two channel, the mobile station canmake handovermeasurements bymonitoring the class one channels as long as the signals are separated in time.
According to another embodiment of the present invention, the class two channels have antenna lobes with variable widths, wherein all of the widths of the antenna lobes of class two channels are less than the width of antenna lobes of class one channels. As a result, as the position of a mobile station is gradually determined, the base station can gradually reduce the antenna lobe width of the class two channel assigned to the mobile station. As a result, the signal quality of the mobile station can be gradually increased.
It would be appreciated by those of ordinary skill in the art that the present invention can be embodied in other specific formswithout departing fromthe spirit or essential character thereof. The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restric¬ tive. The scope of the invention is indicated by the appended claims rather than the foregoing description, and all changes which come within the meaning and range of equivalence thereof are intended to be embraced therein.

Claims

WE CLAIM :
1. Amethod for transmitting and receiving signals at a base station with an antenna array in a cellular communication system, comprising the steps of: dividing available communication channels into a plurality of classes; transmitting signals to a plurality of mobile stations in a first class of channels with a wide antenna lobe; determining position of a mobile station from signals received from said mobile station; transmitting signals to said mobile station in a second class of channels with a narrow antenna lobe when the position of said mobile is determined; and receiving signals from said mobile station with an adjustable lobe widths on both channel classes.
2. A method according to claim 1, wherein said first class of channels is used for call set-up.
3. A method according to claim 2, wherein the position of said mobile station is determined by: measuring the power level of signals received from said mobile station; and determining a proper antenna lobe for a newly connected mobile station.
4. A method according to claim 1, wherein said base station assigns said mobile station to a channel in said second class of channels after the position of said mobile station is determined to be above a predetermined level of certainty.
5. A method according to claim 1, wherein said first class of channels is used for handover between base stations.
6. A method according to claim 5, further comprising the steps of: transmitting and receiving signals at a mobile station on a channel in said second class of channels; and performing handover measurements of signals received at said mobile station on said first class of channels.
7. A method according to claim 1, wherein at least one control channel and a minority of traffic channels belong to the first class of channels.
8. A method according to claim 1, wherein said second class of channels has a smaller reuse distance than said first class of channels.
9. A method according to claim 1, wherein said second class of channels can have more than one user for each channel.
10. A method according to claim 1, wherein said second class of channels can have variable antenna lobe widths.
11. A method according to claim 10, wherein the base station gradually reduces the antenna lobe width of a second class channel assigned to a mobile station as the base station gradually determines the position of said mobile station.
12. A communication system with at least one base station having an antenna arrays, comprising; means for transmitting signals from a base station to a plurality of mobile stations on a plurality of classes of channels; means for receiving signals from a plurality of mobile stations at a base station on a plurality of classes of channels; means for determining a position of a mobile station from said received signals, wherein said base station transmits signals in a first class of channels with a wide antenna lobe and said base station transmits signals in a second class of channels with a narrow antenna lobe when the position of said mobile station has been determined.
13. A cellular communication system according to claim 12, wherein said first class of channels is used for call set-up.
14. A cellular communication system according to claim 12, wherein said first class of channels is used for handover between base stations.
15. A cellular communication system according to claim 13, wherein said position determining means comprises: means for determining a power level of a signal from said mobile station; and means for determining a proper antenna lobe for a newly connected mobile station.
16. A cellular communication system according to claim 13, wherein said base station assigns said mobile station to a channel in said second class of channels after the position of said mobile is determined to be above a predetermined level of certainty.
17. A cellular communication system according to claim 14, wherein a mobile station contains means for transmitting and receiving signal on a channel in said second class of channels and means for measuring handover measurements on a channel in said first class of channels.
18. A cellular communication system according to claim 17, said mobile station further comprising means for transmitting and receiving signals on a channel in said first class of channels.
19. A cellular communication system according to claim 12, wherein at least one control channel and a minority of traffic channels belong to the first class of channels.
20. A cellular communication system according to claim 12, wherein said second class of channels have a smaller reuse distance than said first class of channels.
21. A cellular communication system according to claim 12, wherein said second class of channels can have more than one user for each channel.
22. A cellular communication system according to claim 12, wherein said second class of channels have variable antenna lobe widths.
23. A cellular communication system according to claim 22, wherein the base station gradually reduces the antenna lobe width of a class two channel assigned to a mobile station as the base station gradually determines the position of said mobile station.
PCT/SE1994/000880 1993-09-27 1994-09-23 Using two classes of channels with different capacity WO1995009490A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
CA2148940A CA2148940A1 (en) 1993-09-27 1994-09-23 Using two classes of channels with different capacity
DE69433983T DE69433983T2 (en) 1993-09-27 1994-09-23 USE OF TWO CHANNEL CLASSES WITH DIFFERENT CAPACITY
JP7510248A JPH08508865A (en) 1993-09-27 1994-09-23 Use of two classes of channels with different capacities
KR1019950702126A KR100344503B1 (en) 1993-09-27 1994-09-23 Using two classes of channels with different capacity
NZ274026A NZ274026A (en) 1993-09-27 1994-09-23 Cellular telecommunication: transmitting channels in wide lobe then narrow lobe when mobile position is determined
EP94928540A EP0671085B1 (en) 1993-09-27 1994-09-23 Using two classes of channels with different capacity
AU77935/94A AU677717B2 (en) 1993-09-27 1994-09-23 Using two classes of channels with different capacity
FI952582A FI952582A0 (en) 1993-09-27 1995-05-26 Using two channel categories with different capacities

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US126,558 1980-03-03
US12655893A 1993-09-27 1993-09-27

Publications (1)

Publication Number Publication Date
WO1995009490A1 true WO1995009490A1 (en) 1995-04-06

Family

ID=22425496

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/000880 WO1995009490A1 (en) 1993-09-27 1994-09-23 Using two classes of channels with different capacity

Country Status (14)

Country Link
US (1) US5615409A (en)
EP (1) EP0671085B1 (en)
JP (2) JPH08508865A (en)
KR (1) KR100344503B1 (en)
CN (1) CN1064797C (en)
AU (1) AU677717B2 (en)
CA (1) CA2148940A1 (en)
DE (1) DE69433983T2 (en)
FI (1) FI952582A0 (en)
NZ (1) NZ274026A (en)
RU (1) RU2154903C2 (en)
SG (1) SG49352A1 (en)
TW (1) TW351886B (en)
WO (1) WO1995009490A1 (en)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729285A2 (en) * 1995-02-24 1996-08-28 Alcatel SEL Aktiengesellschaft Carrier frequency allocation in a SDMA radio system
WO1996037969A1 (en) * 1995-05-24 1996-11-28 Nokia Telecommunications Oy Method for transmitting a pilot signal, and a cellular radio system
WO1996037970A1 (en) * 1995-05-24 1996-11-28 Nokia Telecommunications Oy Method for transmitting pilot channels, and a cellular radio system
DE19610334A1 (en) * 1996-03-18 1997-09-25 Bernhard Dr Ing Walke System for point to multipoint radio network (PMP)
WO1998005180A1 (en) * 1996-07-31 1998-02-05 Telefonaktiebolaget Lm Ericsson (Publ) Circuitry and method for time division multiple access communication system
WO1998014024A1 (en) * 1996-09-25 1998-04-02 Motorola Limited Communication system with a beamformed control channel and method of system control
EP0837523A2 (en) * 1996-10-18 1998-04-22 Kabushiki Kaisha Toshiba Adaptive antenna
EP0837522A2 (en) * 1996-10-15 1998-04-22 Nortel Networks Corporation Adaptive antenna arrangement for a radio communications system
EP0851609A2 (en) * 1996-12-25 1998-07-01 Matsushita Electric Industrial Co., Ltd. Transceiver in base station for communicating with high-speed and low speed communication spread spectrum mobile users
WO1998033233A1 (en) * 1997-01-28 1998-07-30 Telefonaktiebolaget Lm Ericsson (Publ) Directional-beam generative apparatus and associated method
EP0866568A1 (en) * 1997-03-20 1998-09-23 Siemens Aktiengesellschaft Method and reception device for the detection of data
WO1998043106A2 (en) * 1997-03-25 1998-10-01 Siemens Aktiengesellschaft Method for evaluating direction
WO1999022543A1 (en) * 1997-10-29 1999-05-06 Radio Design Innovation Tj Ab Arrangement for different frequency planning in a telecommunication system
EP0926843A2 (en) * 1997-11-26 1999-06-30 Nokia Mobile Phones Ltd. Method and system for operating a cellular system having beamforming antennas
WO1999052311A1 (en) * 1998-04-03 1999-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for handling radio signals in a radio base station
EP0952747A2 (en) * 1998-04-24 1999-10-27 Lucent Technologies Inc. Dual mode base station antenna with wide and narrow beams
FR2780817A1 (en) * 1998-07-06 2000-01-07 Sfr Sa RADIO-RADIATION BEAM ORIENTATION METHOD (S) FOR COMMUNICATION BETWEEN A BASE STATION AND A MOBILE RADIOTELEPHONE, AND CORRESPONDING BASE STATION
WO2000002405A1 (en) * 1998-07-03 2000-01-13 Radio Design Innovation Tj Ab Mobile telecommunication system
EP1077508A2 (en) * 1999-08-14 2001-02-21 Robert Bosch Gmbh Indoor antenna with changeable antenna characteristics for communication with high data rates
WO2001031809A2 (en) * 1999-10-28 2001-05-03 Telefonaktiebolaget Lm Ericsson (Publ) Downlink power control and adaptive beamforming for half-rate radiocommunication systems
EP1193792A2 (en) * 2000-10-02 2002-04-03 NTT DoCoMo, Inc. Mobile communication base station equipment
WO2002013394A3 (en) * 2000-08-10 2002-04-25 Siemens Ag Method for assignment of transmission channels in a radio communication system
WO2002078372A3 (en) * 2001-03-23 2003-11-13 Qualcomm Inc Wireless communications with an adaptive antenna array
FR2861231A1 (en) * 2003-10-20 2005-04-22 Thomson Licensing Sa Business/domestic wireless transmitter/receiver station communications network/method having first omni direction station/multiple station frame transfer and second directively exchanged frame set
EP1527618A1 (en) * 2002-06-28 2005-05-04 Interdigital Technology Corporation System for efficiently providing coverage of a sectorized cell
WO2007050949A1 (en) * 2005-10-26 2007-05-03 Intel Corporation Communication signaling using multiple frequency bands in a wireless network
WO2007095328A3 (en) * 2006-02-14 2007-11-29 Sibeam Hd physical layer of a wireless communication device
US7596387B2 (en) 2002-06-28 2009-09-29 Interdigital Technology Corporation System for efficiently covering a sectorized cell utilizing beam forming and sweeping
GB2459131A (en) * 2008-04-11 2009-10-14 Vodafone Group Services Ltd Locating nodes of a telecommunications system
US7653163B2 (en) 2005-10-26 2010-01-26 Intel Corporation Systems for communicating using multiple frequency bands in a wireless network
US7689171B2 (en) 2006-11-27 2010-03-30 Intel Corporation Reducing interference in a wireless network via antenna selection
US7720036B2 (en) 2005-10-26 2010-05-18 Intel Corporation Communication within a wireless network using multiple frequency bands
US8340071B2 (en) 2005-10-26 2012-12-25 Intel Corporation Systems for communicating using multiple frequency bands in a wireless network
US9084260B2 (en) 2005-10-26 2015-07-14 Intel Corporation Systems for communicating using multiple frequency bands in a wireless network

Families Citing this family (104)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2626514B2 (en) * 1993-11-08 1997-07-02 日本電気株式会社 Base station transceiver
US6684071B1 (en) * 1994-01-11 2004-01-27 Ericsson Inc. Terminal position location using multiple beams
US5790606A (en) * 1994-01-11 1998-08-04 Ericsson Inc. Joint demodulation using spatial maximum likelihood
JPH10502231A (en) * 1994-06-23 1998-02-24 テレフオンアクチーボラゲツト エル エム エリクソン Intra-cell handover with antenna array
US6137843A (en) * 1995-02-24 2000-10-24 Ericsson Inc. Methods and apparatus for canceling adjacent channel signals in digital communications systems
FI105513B (en) * 1995-05-24 2000-08-31 Nokia Networks Oy Reception procedure and recipients
US6697633B1 (en) * 1995-06-02 2004-02-24 Northrop Grummar Corporation Method permitting increased frequency re-use in a communication network, by recovery of transmitted information from multiple cochannel signals
US6658234B1 (en) * 1995-06-02 2003-12-02 Northrop Grumman Corporation Method for extending the effective dynamic range of a radio receiver system
US6018317A (en) * 1995-06-02 2000-01-25 Trw Inc. Cochannel signal processing system
US6240098B1 (en) * 1995-08-22 2001-05-29 Thomson-Csf Method and device for space division multiplexing of radio signals transmitted in cellular radio communications
GB2309616B (en) * 1996-01-27 2000-05-17 Motorola Ltd A space division multiple access radio communication system and method for allocating channels therein
US5822683A (en) * 1996-04-05 1998-10-13 Ball Aerospace And Technologies Corp. Pseudo-passive transponder device
US6512481B1 (en) * 1996-10-10 2003-01-28 Teratech Corporation Communication system using geographic position data
US6463295B1 (en) 1996-10-11 2002-10-08 Arraycomm, Inc. Power control with signal quality estimation for smart antenna communication systems
US7035661B1 (en) 1996-10-11 2006-04-25 Arraycomm, Llc. Power control with signal quality estimation for smart antenna communication systems
US6275543B1 (en) 1996-10-11 2001-08-14 Arraycomm, Inc. Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing
AU5442998A (en) * 1996-11-18 1998-06-10 Argosystems, Inc. Adaptive beamforming for wireless communication
US5924040A (en) * 1996-11-20 1999-07-13 Telxon Corporation Wireless communication system having base station with adjustable power transceiver for locating mobile devices
ES2200348T3 (en) * 1997-03-25 2004-03-01 Siemens Aktiengesellschaft PROCEDURE FOR ESTIMATING CHANNEL FROM RECEPTION SIGNALS TRANSMITTED THROUGH A RADIO CHANNEL.
SE509776C2 (en) 1997-07-04 1999-03-08 Ericsson Telefon Ab L M Device and method of antenna loop control in radio communication systems
US6195556B1 (en) 1997-07-15 2001-02-27 Metawave Communications Corporation System and method of determining a mobile station's position using directable beams
US6333953B1 (en) * 1997-07-21 2001-12-25 Ericsson Inc. System and methods for selecting an appropriate detection technique in a radiocommunication system
US5966657A (en) * 1997-07-24 1999-10-12 Telefonaktiebolaget L M Ericsson (Publ) Method and system for radio frequency measurement and automatic frequency planning in a cellular radio system
US5952969A (en) * 1997-08-18 1999-09-14 Telefonakiebolaget L M Ericsson (Publ) Method and system for determining the position of mobile radio terminals
FI106669B (en) * 1997-08-20 2001-03-15 Nokia Networks Oy Broadcasting procedure and radio system
US6519478B1 (en) 1997-09-15 2003-02-11 Metawave Communications Corporation Compact dual-polarized adaptive antenna array communication method and apparatus
US6760603B1 (en) 1997-09-15 2004-07-06 Kathrein-Werke Kg Compact dual-polarized adaptive antenna array communication method and apparatus
US6693982B1 (en) 1997-10-06 2004-02-17 At&T Corp. Minimum mean squared error approach to interference cancellation and maximum likelihood decoding of space-time block codes
US6188914B1 (en) * 1997-10-22 2001-02-13 Nortel Networks Limited Method and apparatus for improving link performance and capacity of a sectorized CDMA cellular communication network
US6006097A (en) * 1997-11-24 1999-12-21 Telefonaktiebolaget L M Ericsson (Publ) Method for determining position of mobile communication terminals
US6154661A (en) * 1997-12-10 2000-11-28 Arraycomm, Inc. Transmitting on the downlink using one or more weight vectors determined to achieve a desired radiation pattern
US7299071B1 (en) * 1997-12-10 2007-11-20 Arraycomm, Llc Downlink broadcasting by sequential transmissions from a communication station having an antenna array
US6580910B1 (en) * 1997-12-19 2003-06-17 Telefonaktiebolaget L M Ericsson (Publ) Method and system for improving handoffs in cellular mobile radio systems
US6097970A (en) * 1997-12-31 2000-08-01 Weblink Wireless, Inc. Antenna system for narrowband communications systems and method of operation
US6097969A (en) * 1997-12-31 2000-08-01 Weblink Wireless, Inc, System for scheduling reverse-channel messages in narrowband communications systems and methods of operation
US6615024B1 (en) * 1998-05-01 2003-09-02 Arraycomm, Inc. Method and apparatus for determining signatures for calibrating a communication station having an antenna array
US6161024A (en) * 1998-10-15 2000-12-12 Airnet Communications Corporations Redundant broadband multi-carrier base station for wireless communications using omni-directional overlay on a tri-sectored wireless system
JP3607512B2 (en) * 1998-11-26 2005-01-05 松下電器産業株式会社 Base station apparatus and transmission power control method
US6314305B1 (en) 1998-12-10 2001-11-06 Lucent Technologies Inc. Transmitter/receiver for combined adaptive array processing and fixed beam switching
US6141566A (en) * 1999-01-11 2000-10-31 Tellabs Operations, Inc. Co-located omnidirectional and sectorized base station
SE9900394L (en) * 1999-02-05 2000-08-06 Radio Design Innovation Tj Ab Arrangements for frequency planning in cell radio systems
US6240290B1 (en) 1999-03-04 2001-05-29 Harris Corporation Base station hand-off mechanism for cellular communication system
JP3987229B2 (en) * 1999-03-16 2007-10-03 テレフオンアクチーボラゲット エル エム エリクソン（パブル） Wireless communication system, base station thereof, and communication method thereof
US6600914B2 (en) 1999-05-24 2003-07-29 Arraycomm, Inc. System and method for emergency call channel allocation
JP3699295B2 (en) 1999-05-24 2005-09-28 東芝テック株式会社 Wireless communication system
US6597927B1 (en) * 1999-05-27 2003-07-22 Nortel Networks Limited Narrow beam traffic channel assignment method and apparatus
US6141567A (en) 1999-06-07 2000-10-31 Arraycomm, Inc. Apparatus and method for beamforming in a changing-interference environment
US7139592B2 (en) * 1999-06-21 2006-11-21 Arraycomm Llc Null deepening for an adaptive antenna based communication station
US7356390B2 (en) * 1999-06-29 2008-04-08 Space Data Corporation Systems and applications of lighter-than-air (LTA) platforms
US6628941B2 (en) * 1999-06-29 2003-09-30 Space Data Corporation Airborne constellation of communications platforms and method
US7203491B2 (en) * 2001-04-18 2007-04-10 Space Data Corporation Unmanned lighter-than-air safe termination and recovery methods
US6453177B1 (en) * 1999-07-14 2002-09-17 Metawave Communications Corporation Transmitting beam forming in smart antenna array system
ATE429084T1 (en) * 1999-07-20 2009-05-15 Texas Instruments Inc WIRELESS NETWORK WITH CALIBRATION OF CONTROLLABLE ANTENNAS VIA INDEPENDENT CONTROL PATH
US6850505B1 (en) * 1999-09-01 2005-02-01 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for Doppler frequency estimation
US6757553B1 (en) * 1999-10-14 2004-06-29 Qualcomm Incorporated Base station beam sweeping method and apparatus using multiple rotating antennas
US6985466B1 (en) 1999-11-09 2006-01-10 Arraycomm, Inc. Downlink signal processing in CDMA systems utilizing arrays of antennae
GB9927517D0 (en) * 1999-11-23 2000-01-19 Motorola Ltd Adaptive antenna and network incorporating same
US6901062B2 (en) * 1999-12-01 2005-05-31 Kathrein-Werke Kg Adaptive antenna array wireless data access point
US6611695B1 (en) * 1999-12-20 2003-08-26 Nortel Networks Limited Method and apparatus for assigning frequency channels to a beam in a multi-beam cellular communications system
JP4187377B2 (en) * 2000-02-23 2008-11-26 富士通株式会社 Radio transceiver and radio wave radiation direction control method
DE10009150A1 (en) * 2000-02-26 2001-08-30 Bosch Gmbh Robert Data transmission method and system
US6804252B1 (en) * 2000-05-19 2004-10-12 Ipr Licensing, Inc. Automatic reverse channel assignment in a two-way TDM communication system
FR2809250B1 (en) * 2000-05-19 2003-10-03 Sagem SHORT-RANGE RADIO RECEIVER WITH ADJUSTABLE LOBE ANTENNA FOR MOTOR VEHICLE DATA
US8363744B2 (en) 2001-06-10 2013-01-29 Aloft Media, Llc Method and system for robust, secure, and high-efficiency voice and packet transmission over ad-hoc, mesh, and MIMO communication networks
JP4306098B2 (en) * 2000-06-30 2009-07-29 株式会社デンソー Communication device
JP2002026790A (en) * 2000-07-03 2002-01-25 Matsushita Electric Ind Co Ltd Wireless communication unit and wireless communication method
JP2002111564A (en) * 2000-09-27 2002-04-12 Matsushita Electric Ind Co Ltd Base station device and radio transmission method
US7242964B1 (en) * 2000-09-28 2007-07-10 Lucent Technologies Inc. Shaping of EM field for transmission to multiple terminals
US6564036B1 (en) * 2000-09-29 2003-05-13 Arraycomm, Inc. Mode switching in adaptive array communications systems
US7043259B1 (en) * 2000-09-29 2006-05-09 Arraycomm, Inc. Repetitive paging from a wireless data base station having a smart antenna system
US7062294B1 (en) 2000-09-29 2006-06-13 Arraycomm, Llc. Downlink transmission in a wireless data communication system having a base station with a smart antenna system
US6795409B1 (en) 2000-09-29 2004-09-21 Arraycomm, Inc. Cooperative polling in a wireless data communication system having smart antenna processing
US6982968B1 (en) 2000-09-29 2006-01-03 Arraycomm, Inc. Non-directional transmitting from a wireless data base station having a smart antenna system
JP3786918B2 (en) * 2000-10-11 2006-06-21 サムスン エレクトロニクス カンパニー リミテッド Transmission antenna array control apparatus and method for physical downlink shared channel in mobile communication system
US7181244B2 (en) * 2000-11-16 2007-02-20 Qualcomm, Incorporated Method and apparatus for using position location to direct narrow beam antennas
US6996418B2 (en) * 2000-12-29 2006-02-07 Nortel Networks Limited Apparatus and method for OFDM data communications
US9908608B2 (en) 2001-04-18 2018-03-06 Space Data Corporation Systems and applications of lighter-than-air (LTA) platforms
US9632503B2 (en) 2001-04-18 2017-04-25 Space Data Corporation Systems and applications of lighter-than-air (LTA) platforms
US9643706B2 (en) 2001-04-18 2017-05-09 Space Data Corporation Systems and applications of lighter-than-air (LTA) platforms
JP2003101515A (en) * 2001-09-25 2003-04-04 Sony Corp Radio communication system, base station, mobile station, transmission control method and program storage medium
TW595857U (en) * 2001-11-29 2004-06-21 Us 091219345
US8861466B2 (en) 2002-08-07 2014-10-14 Interdigital Technology Corporation Mobile communication system and method for providing common channel coverage using beamforming antennas
US8213994B2 (en) * 2002-08-07 2012-07-03 Interdigital Technology Corporation Mobile communications system and method for providing common channel coverage using beamforming antennas
TW200729983A (en) * 2002-09-27 2007-08-01 Interdigital Tech Corp Mobile communications system and method for providing mobile unit handover in wireless communication systems that employ beamforming antennas
US7606192B2 (en) * 2002-09-30 2009-10-20 Intel Corporation Transmitting signals on a channel used for traffic and access in a communications system
US7492743B2 (en) * 2002-09-30 2009-02-17 Intel Corporation Assigning training sequences based on spatial channels in a wireless communications system
US7729316B2 (en) * 2002-09-30 2010-06-01 Intel Corporation Receiving signals on a channel used for traffic and access in a communications system
US7277730B2 (en) * 2002-12-26 2007-10-02 Nokia Corporation Method of allocating radio resources in telecommunication system, and telecommunication system
US7292189B2 (en) * 2004-09-10 2007-11-06 Worcester Polytechnic Institute Methods and apparatus for high resolution positioning
US8199724B2 (en) * 2005-09-23 2012-06-12 Xr Communications, Llc Multiple beam antenna base station
CN104333404B (en) * 2006-01-04 2018-10-02 艾利森电话股份有限公司 Array antenna device
US8060099B2 (en) * 2008-08-27 2011-11-15 Qualcomm Incorporated Inter-sector control channel transmission
US8412093B2 (en) * 2008-10-22 2013-04-02 Mediatek Inc. Receiver applying channel selection filter for receiving satellite signal and receiving method thereof
WO2011140794A1 (en) * 2010-11-16 2011-11-17 华为技术有限公司 Method and system for on-line adjusting angle of base station antenna
KR20130125903A (en) 2012-05-10 2013-11-20 삼성전자주식회사 Apparatus and method for performing beamforming in communication system
RU2636655C2 (en) 2012-07-31 2017-11-27 Самсунг Электроникс Ко., Лтд. Method and device for communication using formation of diagrams of direction in wireless communication system
BR112017013836B1 (en) 2014-12-24 2022-05-24 Space Data Corporation Detachment of a platform by pending collision
MX2017008552A (en) 2014-12-24 2018-03-15 Space Data Corp Techniques for intelligent balloon/airship launch and recovery window location.
US10059421B2 (en) 2014-12-30 2018-08-28 Space Data Corporation Multifunctional balloon membrane
US9763162B2 (en) 2015-01-30 2017-09-12 Telefonaktiebolaget L M Ericsson (Publ) Cell detection in a cellular communications network
US9762343B2 (en) * 2015-01-30 2017-09-12 Telefonaktiebolaget L M Ericsson (Publ) Interference rejection for improved cell detection
US9509427B2 (en) 2015-04-22 2016-11-29 Telefonaktiebolaget L M Ericsson (Publ) Adaptive suppression of unknown interference
JP6551611B2 (en) * 2016-09-23 2019-07-31 株式会社村田製作所 Position estimation system and position estimation method
US11564182B2 (en) 2018-10-09 2023-01-24 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for power control

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5193109A (en) * 1989-02-06 1993-03-09 Pactel Corporation Zoned microcell with sector scanning for cellular telephone system
US5212830A (en) * 1991-05-31 1993-05-18 International Mobile Machines Corporation Radio frequency communications system
US5212805A (en) * 1990-06-29 1993-05-18 Motorola, Inc. Near-field on-site/trunking system frequency sharing
US5230081A (en) * 1989-09-19 1993-07-20 Nippon Telegraph And Telephone Corporation Method and apparatus for locating which zone and sector of a mobile communication system a mobile station is in
US5276907A (en) * 1991-01-07 1994-01-04 Motorola Inc. Method and apparatus for dynamic distribution of a communication channel load in a cellular radio communication system
US5327576A (en) * 1990-08-23 1994-07-05 Telefonakitebolaget L M Ericsson Handoff of a mobile station between half rate and full rate channels

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2189348B (en) * 1979-05-23 1988-04-20 Standard Telephones Cables Ltd Adaptive antenna arrays for frequency hopped systems
US4338605A (en) * 1980-02-28 1982-07-06 Westinghouse Electric Corp. Antenna array with adaptive sidelobe cancellation
EP0188504B1 (en) * 1984-07-23 1989-12-13 The Commonwealth Of Australia Adaptive antenna array
US4575724A (en) * 1984-08-15 1986-03-11 The United States Of America As Represented By The Secretary Of The Air Force Parallel processor configuration for adaptive antenna arrays
US4723266A (en) * 1987-01-21 1988-02-02 General Electric Company Cellular communication system sharing control channels between cells to reduce number of control channels
US5021801A (en) * 1989-09-05 1991-06-04 Motorola, Inc. Antenna switching system
US5117238A (en) * 1991-02-19 1992-05-26 General Electric Company Superresolution beamformer for large order phased array system
US5122732A (en) * 1991-02-19 1992-06-16 General Electric Company Multi-rate superresolution time series spectrum analyzer
FI91344C (en) * 1991-03-05 1994-06-10 Nokia Telecommunications Oy Cellular radio network, base station and method for regionally adjusting traffic capacity in a cellular radio network

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5193109A (en) * 1989-02-06 1993-03-09 Pactel Corporation Zoned microcell with sector scanning for cellular telephone system
US5230081A (en) * 1989-09-19 1993-07-20 Nippon Telegraph And Telephone Corporation Method and apparatus for locating which zone and sector of a mobile communication system a mobile station is in
US5212805A (en) * 1990-06-29 1993-05-18 Motorola, Inc. Near-field on-site/trunking system frequency sharing
US5327576A (en) * 1990-08-23 1994-07-05 Telefonakitebolaget L M Ericsson Handoff of a mobile station between half rate and full rate channels
US5276907A (en) * 1991-01-07 1994-01-04 Motorola Inc. Method and apparatus for dynamic distribution of a communication channel load in a cellular radio communication system
US5212830A (en) * 1991-05-31 1993-05-18 International Mobile Machines Corporation Radio frequency communications system

Cited By (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729285A3 (en) * 1995-02-24 1999-05-06 Alcatel SEL Aktiengesellschaft Carrier frequency allocation in a SDMA radio system
EP0729285A2 (en) * 1995-02-24 1996-08-28 Alcatel SEL Aktiengesellschaft Carrier frequency allocation in a SDMA radio system
CN1092428C (en) * 1995-05-24 2002-10-09 诺基亚电信公司 Method for transmitting pilot signal, and cellular radio system
WO1996037969A1 (en) * 1995-05-24 1996-11-28 Nokia Telecommunications Oy Method for transmitting a pilot signal, and a cellular radio system
WO1996037970A1 (en) * 1995-05-24 1996-11-28 Nokia Telecommunications Oy Method for transmitting pilot channels, and a cellular radio system
AU707124B2 (en) * 1995-05-24 1999-07-01 Nokia Telecommunications Oy Method for transmitting a pilot signal, and a cellular radio system
AU707721B2 (en) * 1995-05-24 1999-07-15 Nokia Telecommunications Oy Method for transmitting pilot channels, and a cellular radio system
US5966670A (en) * 1995-05-24 1999-10-12 Nokia Telecommunications Oy Method for transmitting a pilot signal, and a cellular radio system
US6415163B1 (en) 1995-05-24 2002-07-02 Nokia Telecommunications Oy Method for transmitting pilot channels and a cellular radio system
DE19610334A1 (en) * 1996-03-18 1997-09-25 Bernhard Dr Ing Walke System for point to multipoint radio network (PMP)
DE19610334C2 (en) * 1996-03-18 2000-09-28 Bernhard Walke Point-to-multipoint radio system with dynamic channel selection and simultaneous operation in different frequency bands due to radio propagation
WO1998005180A1 (en) * 1996-07-31 1998-02-05 Telefonaktiebolaget Lm Ericsson (Publ) Circuitry and method for time division multiple access communication system
US5838674A (en) * 1996-07-31 1998-11-17 Telefonaktiebolaget L M Ericsson Circuitry and method for time division multiple access communication system
WO1998014024A1 (en) * 1996-09-25 1998-04-02 Motorola Limited Communication system with a beamformed control channel and method of system control
EP0837522A3 (en) * 1996-10-15 1998-06-03 Nortel Networks Corporation Adaptive antenna arrangement for a radio communications system
EP0837522A2 (en) * 1996-10-15 1998-04-22 Nortel Networks Corporation Adaptive antenna arrangement for a radio communications system
EP0837523A3 (en) * 1996-10-18 1998-06-03 Kabushiki Kaisha Toshiba Adaptive antenna
EP0837523A2 (en) * 1996-10-18 1998-04-22 Kabushiki Kaisha Toshiba Adaptive antenna
US5936577A (en) * 1996-10-18 1999-08-10 Kabushiki Kaisha Toshiba Adaptive antenna
EP0851609A3 (en) * 1996-12-25 2000-10-25 Matsushita Electric Industrial Co., Ltd. Transceiver in base station for communicating with high-speed and low speed communication spread spectrum mobile users
US6212407B1 (en) 1996-12-25 2001-04-03 Matsushita Electric Industrial Co., Ltd. Spread-spectrum transmitter and receiver providing suppressed interference between high-speed and low-speed communication users
CN1077369C (en) * 1996-12-25 2002-01-02 松下电器产业株式会社 Transmitter and receiver
EP0851609A2 (en) * 1996-12-25 1998-07-01 Matsushita Electric Industrial Co., Ltd. Transceiver in base station for communicating with high-speed and low speed communication spread spectrum mobile users
WO1998033233A1 (en) * 1997-01-28 1998-07-30 Telefonaktiebolaget Lm Ericsson (Publ) Directional-beam generative apparatus and associated method
EP0866568A1 (en) * 1997-03-20 1998-09-23 Siemens Aktiengesellschaft Method and reception device for the detection of data
WO1998043106A3 (en) * 1997-03-25 1998-12-23 Siemens Ag Method for evaluating direction
WO1998043106A2 (en) * 1997-03-25 1998-10-01 Siemens Aktiengesellschaft Method for evaluating direction
WO1999022543A1 (en) * 1997-10-29 1999-05-06 Radio Design Innovation Tj Ab Arrangement for different frequency planning in a telecommunication system
EP0926843A2 (en) * 1997-11-26 1999-06-30 Nokia Mobile Phones Ltd. Method and system for operating a cellular system having beamforming antennas
EP0926843A3 (en) * 1997-11-26 2000-08-02 Nokia Mobile Phones Ltd. Method and system for operating a cellular system having beamforming antennas
US6108323A (en) * 1997-11-26 2000-08-22 Nokia Mobile Phones Limited Method and system for operating a CDMA cellular system having beamforming antennas
WO1999052311A1 (en) * 1998-04-03 1999-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for handling radio signals in a radio base station
EP0952747A3 (en) * 1998-04-24 2001-01-17 Lucent Technologies Inc. Dual mode base station antenna with wide and narrow beams
US6349217B1 (en) 1998-04-24 2002-02-19 Lucent Technologies Inc. Multi-mode/multi-rate fixed wireless communication system
EP0952747A2 (en) * 1998-04-24 1999-10-27 Lucent Technologies Inc. Dual mode base station antenna with wide and narrow beams
WO2000002405A1 (en) * 1998-07-03 2000-01-13 Radio Design Innovation Tj Ab Mobile telecommunication system
EP0971438A1 (en) * 1998-07-06 2000-01-12 Societé Francaise du Radiotéléphone SRF Method for directing radiating beams for the communication between a base station and a mobile radio telephone and base station therefor
FR2780817A1 (en) * 1998-07-06 2000-01-07 Sfr Sa RADIO-RADIATION BEAM ORIENTATION METHOD (S) FOR COMMUNICATION BETWEEN A BASE STATION AND A MOBILE RADIOTELEPHONE, AND CORRESPONDING BASE STATION
EP1077508A2 (en) * 1999-08-14 2001-02-21 Robert Bosch Gmbh Indoor antenna with changeable antenna characteristics for communication with high data rates
US6539010B1 (en) 1999-10-28 2003-03-25 Telefonaktiebolaget Lm Ericsson (Publ) Downlink power control and adaptive beamforming for half-rate radiocommunication systems
WO2001031809A2 (en) * 1999-10-28 2001-05-03 Telefonaktiebolaget Lm Ericsson (Publ) Downlink power control and adaptive beamforming for half-rate radiocommunication systems
WO2001031809A3 (en) * 1999-10-28 2002-02-14 Ericsson Telefon Ab L M Downlink power control and adaptive beamforming for half-rate radiocommunication systems
WO2002013394A3 (en) * 2000-08-10 2002-04-25 Siemens Ag Method for assignment of transmission channels in a radio communication system
US6907269B2 (en) 2000-10-02 2005-06-14 Ntt Docomo, Inc. Mobile communication base station equipment
EP1193792A3 (en) * 2000-10-02 2003-06-04 NTT DoCoMo, Inc. Mobile communication base station equipment
EP1193792A2 (en) * 2000-10-02 2002-04-03 NTT DoCoMo, Inc. Mobile communication base station equipment
CN100334816C (en) * 2001-03-23 2007-08-29 高通股份有限公司 Wireless communications with an adaptive antenna array
WO2002078372A3 (en) * 2001-03-23 2003-11-13 Qualcomm Inc Wireless communications with an adaptive antenna array
KR100883943B1 (en) * 2001-03-23 2009-02-18 퀄컴 인코포레이티드 Wireless communications with an adaptive antenna array
US7340279B2 (en) 2001-03-23 2008-03-04 Qualcomm Incorporated Wireless communications with an adaptive antenna array
EP1527618A4 (en) * 2002-06-28 2008-12-17 Interdigital Tech Corp System for efficiently providing coverage of a sectorized cell
US7596387B2 (en) 2002-06-28 2009-09-29 Interdigital Technology Corporation System for efficiently covering a sectorized cell utilizing beam forming and sweeping
EP1527618A1 (en) * 2002-06-28 2005-05-04 Interdigital Technology Corporation System for efficiently providing coverage of a sectorized cell
FR2861231A1 (en) * 2003-10-20 2005-04-22 Thomson Licensing Sa Business/domestic wireless transmitter/receiver station communications network/method having first omni direction station/multiple station frame transfer and second directively exchanged frame set
WO2005039225A1 (en) 2003-10-20 2005-04-28 Thomson Licensing Method of communication in a wireless communication network, corresponding station and network
US7720036B2 (en) 2005-10-26 2010-05-18 Intel Corporation Communication within a wireless network using multiple frequency bands
US7653163B2 (en) 2005-10-26 2010-01-26 Intel Corporation Systems for communicating using multiple frequency bands in a wireless network
WO2007050949A1 (en) * 2005-10-26 2007-05-03 Intel Corporation Communication signaling using multiple frequency bands in a wireless network
US8340071B2 (en) 2005-10-26 2012-12-25 Intel Corporation Systems for communicating using multiple frequency bands in a wireless network
US9084260B2 (en) 2005-10-26 2015-07-14 Intel Corporation Systems for communicating using multiple frequency bands in a wireless network
US10193733B2 (en) 2005-10-26 2019-01-29 Intel Corporation Wireless communication system to communicate using different beamwidths
US10686638B2 (en) 2005-10-26 2020-06-16 Intel Corporation Wireless communication system to communicate using different beamwidths
WO2007095328A3 (en) * 2006-02-14 2007-11-29 Sibeam Hd physical layer of a wireless communication device
US8014416B2 (en) 2006-02-14 2011-09-06 Sibeam, Inc. HD physical layer of a wireless communication device
US7689171B2 (en) 2006-11-27 2010-03-30 Intel Corporation Reducing interference in a wireless network via antenna selection
GB2459131A (en) * 2008-04-11 2009-10-14 Vodafone Group Services Ltd Locating nodes of a telecommunications system

Also Published As

Publication number Publication date
NZ274026A (en) 1997-11-24
CN1064797C (en) 2001-04-18
AU7793594A (en) 1995-04-18
JPH08508865A (en) 1996-09-17
CA2148940A1 (en) 1995-04-06
EP0671085B1 (en) 2004-09-08
DE69433983T2 (en) 2005-09-29
AU677717B2 (en) 1997-05-01
RU2154903C2 (en) 2000-08-20
US5615409A (en) 1997-03-25
KR950704872A (en) 1995-11-20
DE69433983D1 (en) 2004-10-14
CN1116024A (en) 1996-01-31
FI952582A (en) 1995-05-26
JP2005020790A (en) 2005-01-20
SG49352A1 (en) 1998-05-18
EP0671085A1 (en) 1995-09-13
FI952582A0 (en) 1995-05-26
TW351886B (en) 1999-02-01
KR100344503B1 (en) 2002-10-31

Similar Documents

Publication Publication Date Title
AU677717B2 (en) Using two classes of channels with different capacity
JP3887013B2 (en) Method and apparatus for communicating communication signals between a communication unit and a base site
EP1518331B1 (en) Primary station for efficiently covering a sectorized cell utilizing beam forming and sweeping
JP2518156B2 (en) Channel allocation method for wireless communication system
EP1078276B1 (en) Method and apparatus for determining a direction of arrival of a signal
US7702336B2 (en) Channel assignment based on spatial strategies in a wireless network using adaptive antenna arrays
CA2490951A1 (en) System for efficiently providing coverage of a sectorized cell
JPH07193857A (en) Channel assignment system for mobile communication system
WO1996000484A1 (en) Intra-cell handover with antenna arrays
KR100435795B1 (en) Radio base station device and radio communication method
EP1801999B1 (en) Method and system for efficiently covering a cell utilising beam forming and sweeping
JP3208343B2 (en) Diversity device
Nishimori et al. High-power CCI reduction performance of adaptive array for asynchronous TDMA systems

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 94190819.4

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AU CA CN FI JP KR NZ RU

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

WWE Wipo information: entry into national phase

Ref document number: 1994928540

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2148940

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 274026

Country of ref document: NZ

WWE Wipo information: entry into national phase

Ref document number: 952582

Country of ref document: FI

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWP Wipo information: published in national office

Ref document number: 1994928540

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1994928540

Country of ref document: EP