CA2491929C - Process for implementation of a blind handover in an intersystem and interfrequency handover with mobile communications systems - Google Patents
Process for implementation of a blind handover in an intersystem and interfrequency handover with mobile communications systems Download PDFInfo
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- CA2491929C CA2491929C CA2491929A CA2491929A CA2491929C CA 2491929 C CA2491929 C CA 2491929C CA 2491929 A CA2491929 A CA 2491929A CA 2491929 A CA2491929 A CA 2491929A CA 2491929 C CA2491929 C CA 2491929C
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010295 mobile communication Methods 0.000 title claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000001419 dependent effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/0009—Transmission of position information to remote stations
- G01S5/0018—Transmission from mobile station to base station
- G01S5/0036—Transmission from mobile station to base station of measured values, i.e. measurement on mobile and position calculation on base station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
- H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/14—Determining absolute distances from a plurality of spaced points of known location
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The invention relates to a method for carrying out a blind handover in an intersystem and interfrequency handover in mobile communication systems, whereby a mobile station is supplied by several base stations prior to the handover i.e. it can receive several other base stations in addition to the supplying base station. According to the invention, measurement of the propagation time of the signals received from the base station is carried out by the mobile station on the air interface. The measured propagation times are transmitted to one of the base stations. The location of the mobile station is determined using the transmitted propagation time measuring data by the mobile communication network. With the aid of a data base, at least one suitable base station for an intersystem or interfrequency handover is then selected using the determined location and the data necessary for a handover is transmitted to the mobile station from the selected base station.The mobile station can carry out the handover to the selected base station using said information.
Description
[Modified page]
Process for Implementation of a Blind Handover in an Intersystem- and Interfrequency Handover with Mobile Communication Systems The invention relates to a process for implementation of a so-called "Blind Handover" in an inter-system and interfrequency Handover in mobile communication systems, in particular with inho-mogeneous network structures of shared mobile communication systems.
With a so-called Blind Handover (HO) with inhomogeneity of the different network structures, i.e., different frequency layers or provider regions of the participating networks, no guarantee can be given for the successful implementation of the HO.
The specifications valid at this time, for example, disclosed in 3GPP TS
23.009 V5.1.0 (2002-06) "3rd Generation Partnership Project", Technical Specification Group Core Network, Handover Procedures (Release 5), provides that, for example, with a handover between one UMTS layer and one GSM layer per UMTS cell one HO candidate can be configured for a blind handover. In this case it is assumed that the provider region of the destination cell is compatible with the origi-nating cell, i.e., the provider regions of the respective cells of the UMTS
and the GSM networks are congruent at the place of the handover. Otherwise the arising situation is ambiguous. The result would then be an HO error and therewith the risk of losing the connection (call drop).
In order to avoid these problems with a blind handover, so-called dual-mobile end devices can be used, i.e., mobile telephones with two separate transmit/receive arrangements that can work at two different frequencies or in two mobile radio networks.
(Modified page]
Process for Implementation of a Blind Handover in an Intersystem- and Interfrequency Handover with Mobile Communication Systems The invention relates to a process for implementation of a so-called "Blind Handover" in an inter-system and interfrequency Handover in mobile communication systems, in particular with inho-mogeneous network structures of shared mobile communication systems.
With a so-called Blind Handover (HO) with inhomogeneity of the different network structures, i.e., different frequency layers or provider regions of the participating networks, no guarantee can be given for the successful implementation of the HO.
The specifications valid at this time, for example, disclosed in 3GPP TS
23.009 V5.1.0 (2002-06) "3rd Generation Partnership Project", Technical Specification Group Core Network, Handover Procedures (Release 5), provides that, for example, with a handover between one UMTS layer and one GSM layer per UMTS cell one HO candidate can be configured for a blind handover. In this case it is assumed that the provider region of the destination cell is compatible with the origi-nating cell, i.e., the provider regions of the respective cells of the UMTS
and the GSM networks are congruent at the place of the handover. Otherwise the arising situation is ambiguous. The result would then be an HO error and therewith the risk of losing the connection (call drop).
In order to avoid these problems with a blind handover, so-called dual-mobile end devices can be used, i.e., mobile telephones with two separate transmit/receive arrangements that can work at two different frequencies or in two mobile radio networks.
(Modified page]
In WO 00 28774 A a process is proposed for implementation of an intersystem and interfre-quency handover within CDMA networks, wherein a mobile station is provided with radio signals by several base stations, and, with the aid of a database, on the basis of the stopping location of the mobile station at least one suitable base station is selected for the intersystem and interfre-quency handover. The data of the selected station required for a handover is communicated to the mobile station, so that the mobile station can execute the handover to the selected base sta-tion. The mobile station determines its stopping location by means of a satellite-supported GPS
positioning system and/or through transmission time measurement of the radio signal and trans-fers the determined position data to the mobile radio system. The disadvantage of this is that the mobile stations, for executing this handover process, preferably must be fitted with a GPS posi-tioning system, which causes additional costs and increases the structural size of the device.
Not an object of the process described here are the signalizations exchanged between participat-ing devices and the participating network nodes, as for example base stations, RNC (radio net-work controllers) and exchange sites (UMSC) of the participating mobile communications net-works. Therefore this will not be detailed further.
The object of the invention is to state a process through which a blind handover can be imple-mented without great risk between two different layers of mobile communication systems, even if these have no common network structure. The process is intended to be based purely on a trans-mission time measurement of the radio signals for determination of the stopping location of the mobile station, so that on the part of the mobile stations no additional hardware is needed.
This object is achieved according to the invention through the features of patent claim 1.
[Modified page) 2a The invention starts with the fact that before the handover a mobile station is cared for by several base stations, i.e., besides the provider base station signals of several other base stations can also be received.
According to the invention, a transmission time measurement is implemented by the mobile sta-tion of the signals received from the base station on the air interface.
According to the level ratio of the signals the end device must be forcibly requested to carry out this transmission time meas-urement. The measured transmission times are transmitted to one of the base stations. There-upon, based on the transmitted measured transmission time data, the location of the mobile sta-tion is determined by the mobile communications network. With the help of a data base, on the basis of the determined stopping location at least one suitable base station is selected for an in-tersystem or interfrequency handover, and the data required for a handover for the selected base station is transmitted to the mobile station. On the basis of this information the mobile station can implement the handover to the selected base station.
With this process, by means of a further developed blind handover, henceforth designated blind handover advanced, the possibility exists of implementing such handovers in a more unerring manner.
positioning system and/or through transmission time measurement of the radio signal and trans-fers the determined position data to the mobile radio system. The disadvantage of this is that the mobile stations, for executing this handover process, preferably must be fitted with a GPS posi-tioning system, which causes additional costs and increases the structural size of the device.
Not an object of the process described here are the signalizations exchanged between participat-ing devices and the participating network nodes, as for example base stations, RNC (radio net-work controllers) and exchange sites (UMSC) of the participating mobile communications net-works. Therefore this will not be detailed further.
The object of the invention is to state a process through which a blind handover can be imple-mented without great risk between two different layers of mobile communication systems, even if these have no common network structure. The process is intended to be based purely on a trans-mission time measurement of the radio signals for determination of the stopping location of the mobile station, so that on the part of the mobile stations no additional hardware is needed.
This object is achieved according to the invention through the features of patent claim 1.
[Modified page) 2a The invention starts with the fact that before the handover a mobile station is cared for by several base stations, i.e., besides the provider base station signals of several other base stations can also be received.
According to the invention, a transmission time measurement is implemented by the mobile sta-tion of the signals received from the base station on the air interface.
According to the level ratio of the signals the end device must be forcibly requested to carry out this transmission time meas-urement. The measured transmission times are transmitted to one of the base stations. There-upon, based on the transmitted measured transmission time data, the location of the mobile sta-tion is determined by the mobile communications network. With the help of a data base, on the basis of the determined stopping location at least one suitable base station is selected for an in-tersystem or interfrequency handover, and the data required for a handover for the selected base station is transmitted to the mobile station. On the basis of this information the mobile station can implement the handover to the selected base station.
With this process, by means of a further developed blind handover, henceforth designated blind handover advanced, the possibility exists of implementing such handovers in a more unerring manner.
3 PCTlDE120031002121 - The end device need not be fitted with GPS or a dual end device (with two trans-mit/receive units) and can therefore be produced cost-effectively.
Advantageous embodiments and developments of the invention result from the features of the dependent claims.
For determination of the location information the participating device must measure the level rela-tionship of its own cell and that of at least one or two additional cells.
Besides the signal levels, the signal transmission times of the cells are also measured. If this is not actually required through the current level relationship, the end device must be forcibly called upon to execute this measurement. This can happen, for example, through specifically informing the end device of the other provider threshold values which force a measurement, or through adjusting at the start the parameters of the network so that these measurements are obligatorily executed.
The information thus generated of the signal transmission times is transferred to the network. In order to be able to utilize this information for a blind HO, the layer in which the potential destina-tion cell is located must be analyzed beforehand as to the best provider station, thus the best server. This can happen in different ways and manners. For one, the provider region of the best server can be determined with appropriate processes and, for another, this can occur from the available measurement data. The best server thus obtained can then be assigned at each point over the polygon.
The coordinates of these end devices are then compared to the best server databank and thus the appropriate destination cell is selected. This destination cell is then transferred by HO com-mand to the end device and thus the blind handover is intentionally accomplished.
An implementation example of the invention is detailed on the basis of the drawn figure.
Figure 1 shows, as an example, a section of the cell structure of two overlying mobile communi-cations networks, for example, a UMTS network and a GSM network.
The UMT network comprises a multiplicity of radio cells 10-14, which are provided with radio sig-nals by a multiplicity of fixedly installed base stations 20, 23, 24.
Likewise, the GSM network com-prises a multiplicity of radio cells 1-7, which are provided with radio signals by a multiplicity of fix-edly installed base stations 20-22.
The UMTS and the GMS networks have in common, for example, the site for the base station 20.
A mobile station 30 is located inside the UMTS cell 10 and is provided with radio signals, for ex-ample, by the base station 24. The mobile station 30 would like to execute a blind handover into a suitable radio cell of the GSM network.
According to the invention, for this the stopping location of the mobile station 30 must first be de-termined.
Through a suitable application, the end device is requested to measure the provider level and the quality of the base station 24 and the neighbouring UMTS base stations 20, 23.
In this, the end device 30 must identify unambiguously the appropriate base stations 20, 23, 24 and the associ-ated transmission times of the signals on the air interface must be determined. This information about the neighbouring cells and its own cell is sent as an information packet to one base station, for example, 24.
From only two measured neighbouring cells and its own cell, the location of the end device 30 can thus be calculated. This process is not dependent on whether the stopping place of the end device is inside or outside a building.
In order to determine the stopping place of a participant end device without knowledge of the di-rection information, three base stations 20, 23, 24 are thus necessary, whose locations are accu-rately known. Based on the transmission time measurement of the signals between the final de-vice and each of the base stations, circular rings can be calculated which define the distance of the stopping location end device to the base station in each case. The common point of intersec-tion of the three circular rings is the stopping location of the end device.
The sites of the base sta-tion are here the reference points, the site coordinates being available from the site data bank of the network operator.
In theory three circles intersect at one point. This is impossible under real conditions, since the principal of transmission time measurement is dependent on the propagation conditions and the processing speed of the signals in the microchip of the end device (chip frequency). The segment length per measurement interval cannot be arbitrarily small.
WO 2004/004393 rJ PCTIDE/2003/002121 That means in practice that the stopping location of the end device is described by a sectional area. Hence the accuracy of the determination of the stopping location increases with the number of measured base stations.
With a chip frequency of, for example, 3.84 MHz the smallest measurement interval a per chip calculates to be a = speed of light C / chip frequency fb;t= 300E6 / 3.84E6 = 78 m With modern end devices much better measurement accuracies can be achieved in practice.
Accuracy also depends on the receiver of the end device. The receiver must be able to resolve time intervals within the chip frequency in order to deliver results within a 10 m range. The com-mon sectional area of the circle yields the probable stopping region of the end device.
Since the end device possesses no information on the frame synchronicity of the participating base stations, the determined stopping location of the end device contains additional measure-ment errors.
In order to circumvent these, principally two possibilities are offered:
The base stations are synchronized with a central clock or via GPS time.
Through measurements on the part of the base stations the amount of asynchronicity with respect to other base stations is established and a matrix formed.
Base on the ascertained stopping location of the mobile station 30, with the help of an available data base in the mobile communications network, a determination is made of the most suitable radio cell or base station of the GSM network for a handover. For example, in Fig. 1 this is the GSM base station 20, which provides for the GSM radio cell 1, among others.
So that the mobile station 30 also completes an HO to the appropriate GSM
destination cell 1, it must be informed, after the evaluation of the location information (measured value) of the end device, of the target cell or the appropriate base station 20. This can be accomplished directly in the form of an HO order to the mobile station.
From this there results the fact that the functionality of the appropriate network nodes, for exam-ple, RNC, must be expanded accordingly, such that the evaluation of the measurement data re-sults in location information, from which the best provider base station obtained from a best server databank is sent to the destination cell and is made available to the end device participat-ing in the handover and to the base station.
Advantageous embodiments and developments of the invention result from the features of the dependent claims.
For determination of the location information the participating device must measure the level rela-tionship of its own cell and that of at least one or two additional cells.
Besides the signal levels, the signal transmission times of the cells are also measured. If this is not actually required through the current level relationship, the end device must be forcibly called upon to execute this measurement. This can happen, for example, through specifically informing the end device of the other provider threshold values which force a measurement, or through adjusting at the start the parameters of the network so that these measurements are obligatorily executed.
The information thus generated of the signal transmission times is transferred to the network. In order to be able to utilize this information for a blind HO, the layer in which the potential destina-tion cell is located must be analyzed beforehand as to the best provider station, thus the best server. This can happen in different ways and manners. For one, the provider region of the best server can be determined with appropriate processes and, for another, this can occur from the available measurement data. The best server thus obtained can then be assigned at each point over the polygon.
The coordinates of these end devices are then compared to the best server databank and thus the appropriate destination cell is selected. This destination cell is then transferred by HO com-mand to the end device and thus the blind handover is intentionally accomplished.
An implementation example of the invention is detailed on the basis of the drawn figure.
Figure 1 shows, as an example, a section of the cell structure of two overlying mobile communi-cations networks, for example, a UMTS network and a GSM network.
The UMT network comprises a multiplicity of radio cells 10-14, which are provided with radio sig-nals by a multiplicity of fixedly installed base stations 20, 23, 24.
Likewise, the GSM network com-prises a multiplicity of radio cells 1-7, which are provided with radio signals by a multiplicity of fix-edly installed base stations 20-22.
The UMTS and the GMS networks have in common, for example, the site for the base station 20.
A mobile station 30 is located inside the UMTS cell 10 and is provided with radio signals, for ex-ample, by the base station 24. The mobile station 30 would like to execute a blind handover into a suitable radio cell of the GSM network.
According to the invention, for this the stopping location of the mobile station 30 must first be de-termined.
Through a suitable application, the end device is requested to measure the provider level and the quality of the base station 24 and the neighbouring UMTS base stations 20, 23.
In this, the end device 30 must identify unambiguously the appropriate base stations 20, 23, 24 and the associ-ated transmission times of the signals on the air interface must be determined. This information about the neighbouring cells and its own cell is sent as an information packet to one base station, for example, 24.
From only two measured neighbouring cells and its own cell, the location of the end device 30 can thus be calculated. This process is not dependent on whether the stopping place of the end device is inside or outside a building.
In order to determine the stopping place of a participant end device without knowledge of the di-rection information, three base stations 20, 23, 24 are thus necessary, whose locations are accu-rately known. Based on the transmission time measurement of the signals between the final de-vice and each of the base stations, circular rings can be calculated which define the distance of the stopping location end device to the base station in each case. The common point of intersec-tion of the three circular rings is the stopping location of the end device.
The sites of the base sta-tion are here the reference points, the site coordinates being available from the site data bank of the network operator.
In theory three circles intersect at one point. This is impossible under real conditions, since the principal of transmission time measurement is dependent on the propagation conditions and the processing speed of the signals in the microchip of the end device (chip frequency). The segment length per measurement interval cannot be arbitrarily small.
WO 2004/004393 rJ PCTIDE/2003/002121 That means in practice that the stopping location of the end device is described by a sectional area. Hence the accuracy of the determination of the stopping location increases with the number of measured base stations.
With a chip frequency of, for example, 3.84 MHz the smallest measurement interval a per chip calculates to be a = speed of light C / chip frequency fb;t= 300E6 / 3.84E6 = 78 m With modern end devices much better measurement accuracies can be achieved in practice.
Accuracy also depends on the receiver of the end device. The receiver must be able to resolve time intervals within the chip frequency in order to deliver results within a 10 m range. The com-mon sectional area of the circle yields the probable stopping region of the end device.
Since the end device possesses no information on the frame synchronicity of the participating base stations, the determined stopping location of the end device contains additional measure-ment errors.
In order to circumvent these, principally two possibilities are offered:
The base stations are synchronized with a central clock or via GPS time.
Through measurements on the part of the base stations the amount of asynchronicity with respect to other base stations is established and a matrix formed.
Base on the ascertained stopping location of the mobile station 30, with the help of an available data base in the mobile communications network, a determination is made of the most suitable radio cell or base station of the GSM network for a handover. For example, in Fig. 1 this is the GSM base station 20, which provides for the GSM radio cell 1, among others.
So that the mobile station 30 also completes an HO to the appropriate GSM
destination cell 1, it must be informed, after the evaluation of the location information (measured value) of the end device, of the target cell or the appropriate base station 20. This can be accomplished directly in the form of an HO order to the mobile station.
From this there results the fact that the functionality of the appropriate network nodes, for exam-ple, RNC, must be expanded accordingly, such that the evaluation of the measurement data re-sults in location information, from which the best provider base station obtained from a best server databank is sent to the destination cell and is made available to the end device participat-ing in the handover and to the base station.
Claims (7)
1. Process for implementation of a blind handover in an intersystem and interfrequency hand-over in mobile communication systems, wherein a mobile station (30) is provided with radio sig-nals by several base stations (23, 24) and, with the aid of a database, on the basis of the stop-ping location of the mobile station (30) at least one suitable base station (20) is selected for an intersystem or interfrequency handover, wherein the data of the selected base station (20) re-quired for a handover is communicated to the mobile station and the mobile station (30) imple-ments the handover to the selected base station (20), wherein the mobile station (30) carries out a transmission time measurement of the signals received from the base stations (23, 24) over the air interface as well as a measurement of the signal strengths and/or the signal qualities of the base stations (23, 24), so that the measured transmission times, signal strengths and/or signal qualities are communicated to one of the base stations (23, 24) and that, on the part of the mobile communications network, on the basis of the transmission time measurement the stopping loca-tion of the mobile station (30) is determined, characterized in that the end device is forcibly re-quested to carry out a transmission time measurement, through other provider level threshold values being intentionally communicated to the end device, which values force a measurement, or through the parameters of the network being adjusted beforehand in such a manner that these measurements are obligatorily carried out, and that the mobile station (30) changes at the hand-over from a base station (24) of a first UMTS mobile communications system to a base station (20) of a second GSM mobile communications system.
2. Process according to claim 1, characterized in that the mobile station (30) during the hand-over changes the used radio frequencies.
3. Process according to one of the claims 1 or 2, characterized in that the provider region of the base station (24) serving the mobile station before the handover differs from the provider region of the base station (20) serving the mobile station after the handover.
4. Process according to one of the claims 1 to 3, characterized in that the provider region of the base station (24) serving the mobile station before the handover overlaps the provider region of the base station (20) serving the mobile station after the handover.
5. Process according to one of the claims 1 to 4, characterized in that the exact stopping location of the mobile station (30) is determined by means of a GPS receiver.
6. Process according to one of the claims 1 to 5, characterized in that a frame synchronisation between the participating base stations (23, 24) is carried out by means of a central clock.
7. Process according to one of the claims 1 to 6, characterized in that deviations of the frame synchronisation between the participating base stations (23, 24) are determined, stored in a ma-trix and used for the calculation of the stopping location of the mobile station (30).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10228885A DE10228885B4 (en) | 2002-06-27 | 2002-06-27 | Method for performing a blind handover for inter-system and inter-frequency handover in mobile communication systems |
| DE10228885.2 | 2002-06-27 | ||
| PCT/DE2003/002121 WO2004004393A1 (en) | 2002-06-27 | 2003-06-25 | Method for carrying out a blind handover in an interfrequency handover in mobile communication systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2491929A1 CA2491929A1 (en) | 2004-01-08 |
| CA2491929C true CA2491929C (en) | 2011-04-19 |
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ID=29761497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2491929A Expired - Fee Related CA2491929C (en) | 2002-06-27 | 2003-06-25 | Process for implementation of a blind handover in an intersystem and interfrequency handover with mobile communications systems |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US7058404B2 (en) |
| EP (1) | EP1516507B1 (en) |
| CN (1) | CN100355312C (en) |
| AT (1) | ATE380445T1 (en) |
| AU (1) | AU2003250759A1 (en) |
| CA (1) | CA2491929C (en) |
| DE (2) | DE10228885B4 (en) |
| ES (1) | ES2298574T3 (en) |
| PL (1) | PL215622B1 (en) |
| PT (1) | PT1516507E (en) |
| RU (1) | RU2313922C2 (en) |
| WO (1) | WO2004004393A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1575324A1 (en) * | 2004-03-10 | 2005-09-14 | France Telecom | A new blind handover technique |
| CN100391300C (en) * | 2004-06-07 | 2008-05-28 | 华为技术有限公司 | Blind hand off method from wideband code division multiple access system to worldwide mobile communication system |
| CN100370878C (en) * | 2004-09-23 | 2008-02-20 | 华为技术有限公司 | Control method of different frequency different system switchover |
| US20080102834A1 (en) * | 2006-10-31 | 2008-05-01 | Urs Peter Bernhard | Selecting a target cell for a blind handover |
| US20130189991A1 (en) * | 2010-08-06 | 2013-07-25 | Nokia Siemens Networks Oy | Method for Self-Optimized Interworking Between Radio Access Networks |
| ES2627862T3 (en) * | 2011-05-06 | 2017-07-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and nodes that support cell change |
| CN104378731A (en) * | 2013-08-12 | 2015-02-25 | 中兴通讯股份有限公司 | Blind switching or blind redirection method and system and associated equipment |
| CN110868689B (en) * | 2019-11-25 | 2020-12-08 | 智慧足迹数据科技有限公司 | Standing population determining method and device and electronic equipment |
| CN112888026B (en) * | 2021-01-20 | 2022-12-27 | 维沃移动通信有限公司 | Redirection failure processing method and device, electronic equipment and readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5402413A (en) * | 1991-04-08 | 1995-03-28 | Omnipoint Corporation | Three-cell wireless communication system |
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| US6035197A (en) * | 1994-12-29 | 2000-03-07 | Cellco Partnership | Method and system for providing a handoff from a CDMA cellular telephone system |
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-
2002
- 2002-06-27 DE DE10228885A patent/DE10228885B4/en not_active Expired - Fee Related
-
2003
- 2003-06-25 CN CNB03815109XA patent/CN100355312C/en not_active Expired - Fee Related
- 2003-06-25 RU RU2005101888/09A patent/RU2313922C2/en active
- 2003-06-25 WO PCT/DE2003/002121 patent/WO2004004393A1/en active IP Right Grant
- 2003-06-25 AU AU2003250759A patent/AU2003250759A1/en not_active Abandoned
- 2003-06-25 PT PT03761434T patent/PT1516507E/en unknown
- 2003-06-25 EP EP03761434A patent/EP1516507B1/en not_active Expired - Lifetime
- 2003-06-25 ES ES03761434T patent/ES2298574T3/en not_active Expired - Lifetime
- 2003-06-25 US US10/519,316 patent/US7058404B2/en not_active Expired - Lifetime
- 2003-06-25 PL PL372692A patent/PL215622B1/en unknown
- 2003-06-25 CA CA2491929A patent/CA2491929C/en not_active Expired - Fee Related
- 2003-06-25 AT AT03761434T patent/ATE380445T1/en active
- 2003-06-25 DE DE50308734T patent/DE50308734D1/en not_active Expired - Lifetime
Also Published As
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|---|---|
| RU2005101888A (en) | 2005-08-20 |
| DE50308734D1 (en) | 2008-01-17 |
| RU2313922C2 (en) | 2007-12-27 |
| CA2491929A1 (en) | 2004-01-08 |
| AU2003250759A1 (en) | 2004-01-19 |
| WO2004004393A1 (en) | 2004-01-08 |
| CN100355312C (en) | 2007-12-12 |
| PL215622B1 (en) | 2014-01-31 |
| DE10228885A1 (en) | 2004-01-22 |
| EP1516507B1 (en) | 2007-12-05 |
| ATE380445T1 (en) | 2007-12-15 |
| PT1516507E (en) | 2008-03-12 |
| US7058404B2 (en) | 2006-06-06 |
| PL372692A1 (en) | 2005-07-25 |
| DE10228885B4 (en) | 2006-09-21 |
| ES2298574T3 (en) | 2008-05-16 |
| US20050170836A1 (en) | 2005-08-04 |
| CN1666553A (en) | 2005-09-07 |
| EP1516507A1 (en) | 2005-03-23 |
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| EEER | Examination request | ||
| MKLA | Lapsed |
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