CA2552783A1 - Wireless local area network radio resource management admission control - Google Patents
Wireless local area network radio resource management admission control Download PDFInfo
- Publication number
- CA2552783A1 CA2552783A1 CA002552783A CA2552783A CA2552783A1 CA 2552783 A1 CA2552783 A1 CA 2552783A1 CA 002552783 A CA002552783 A CA 002552783A CA 2552783 A CA2552783 A CA 2552783A CA 2552783 A1 CA2552783 A1 CA 2552783A1
- Authority
- CA
- Canada
- Prior art keywords
- time
- traffic stream
- admission
- medium
- time value
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000001419 dependent effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 108700026140 MAC combination Proteins 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/824—Applicable to portable or mobile terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
Abstract
In a wireless local area network having an access point (AP) and at least one station, wherein data is prioritized by access categories, a method for admission control begins by calculating a transmission budget for each access category (AC) and a total transmission budget for all Acs requiring admission control. A traffic stream admission request is sent from a station to the AP.
A medium time value for the traffic stream is calculated at the AP, based on information extracted from the admission request. The medium time value is compared to the transmission budget for the AC corresponding to the traffic stream and the total transmission budget. The traffic stream is accepted if the medium time value is not greater than both the transmission budget for the AC corresponding to the traffic stream and the total transmission budget;
otherwise, the traffic stream is rejected.
A medium time value for the traffic stream is calculated at the AP, based on information extracted from the admission request. The medium time value is compared to the transmission budget for the AC corresponding to the traffic stream and the total transmission budget. The traffic stream is accepted if the medium time value is not greater than both the transmission budget for the AC corresponding to the traffic stream and the total transmission budget;
otherwise, the traffic stream is rejected.
Description
[0001] WIRELESS LOCAL AREA NETWORK RADIO
RESOURCE MANAGEMENT ADMISSION CONTROL
RESOURCE MANAGEMENT ADMISSION CONTROL
[0002] FIELD OF INVENTION
[00M] The present invention generally relates to a wireless local area network (WLAN) system, and more particularly relates to a radio resource management (RRM) admission control function of a WLAN access point (AP) and a user station.
[0004] BACKGROUND
[0005] The IEEE 802.11e standard provides modifications to the baseline IEEE 802.11 standard for the support of an admission control function at the access point (AP) of a WLAN. The standard provides the mechanisms by which a station (STA) can request admission of a traffic stream (TS) and by which the AP
can notify the STA of the admission or rejection of the request. In the initial 802.11e draft, admission control functionality existed mainly within the STA.
In a later release, this functionality has been moved to the AP and is left unspecified. As the AP decides whether to accept or deny a request for admission, the algorithm used for this determination is not specified in the standard and is left for proprietary implementation.
[0006] With respect to the AP radio resource management (RRM) admission control function, if the AP supports admission control, it uses admission control mandatory (ACM) flags advertised in the enhanced distributed coordination function (EDCF) parameter set element to indicate whether admission control is enabled for each of the access categories (ACs). In the 802.11e standard, admission control is mandatory for Voice (AC_VO) and Video (AC_VI) access categories. However, the Background (AC BK) and Best Effort (AC BE) access categories do not require admission control.
[0007] While the minimum contention window (CWmin[AC]), maximum contention window (CWmax[AC]), arbitration interframe space (AIFS[AC]), and transmit opportunity (TROP [AC] ) limit parameters may be adjusted over time by the AP, the ACM bit is static for the duration of the lifetime of the basic service set (BSS). Upon reception of an add traffic stream (ADDTS) message from a STA
with QoS functionality (QSTA), the AP (also referred to as a QAP) can decide to accept or reject the request and inform the QSTA of the decision.
[0008] With respect to QSTA admission control, each channel access function maintains two variables: Admitted_Time and Used_Time. The Admitted_Time and Used Time variables are set at association time to zero.
Admitted Time is defined as the maximum amount of medium time that the QSTA can use during a one second period. The Used_Time is maintained by the QSTA and indicates the amount of medium time that the QSTA has used. At each successful or unsuccessful transmission attempt by the QSTA, Used Time is updated by the total time required to transmit the frame, including the received acknowledge frame and the overhead in accessing the channel (SIFS interval).
At one second intervals, the Used Time is reset to 0 if it is less than or equal to the admitted time.
[0009] The STA may subsequently decide to explicitly request admission for a specific AC, which is associated with a specific IEEE 802.1D priority.
In order to make such a request, the STA transmits a traffic specification (TSPEC) element contained in an ADDTS request management frame with the following fields specified (i.e., non-zero): nominal MAC service data unit (MSDU) size for the current traffic stream in bytes; mean data rate, the average data rate in bits per second (bps); minimum physical (PHY) rate, the desired minimum PHY rate in bps; and surplus bandwidth allowance, the excess allocation of time and bandwidth over and above the stated application rate requirements. It is noted that these fields are all obtained from operations and maintenance (OA&M) data.
The Medium_Time field is not used in the request frame and is set to zero. The QSTA then waits for an ADDTS response message from the QAP.
[0010] Once the ADDTS response message is received, the QSTA evaluates it to determine if the admission request was approved. If the QAP allows the admission request, then the Medium_Time value (the transmission time available for a traffic stream) is obtained from a TSPEC element contained in the ADDTS response frame and the Admitted Time variable is set equal to the Medium Time value.
[0011] The QSTA then is free to commence frame transmission for the admitted traffic stream. The Used Time is updated each time a frame transmission is initiated as follows:
Used_Time = Used_Time + FrameExchangeTime Equation (1) where FrameExchangeTime equals the time required to transmit the frame plus one acknowledgement (ACK) frame plus one short interframe space (SIFS) interval. Every second, the Used Time is compared with the Admitted Time:
Used_Time = max((Used_Time - Admitted Time), 0) Equation (2) [0012] When the Used_Time reaches or exceeds the Admitted Time value, the corresponding channel access function no longer transmits using the EDCF
parameters for that AC, until a future interval where the Used Time reaches zero again. The 802.11e standard allows the STA to temporarily replace the EDCF parameters for that channel access function with those specified for the access categories Best Effort (AC_BE) or Background (AC BK) in order to continue transmissions at a lower priority, provided no admission control is required for those access categories.
[0013] The STA or AP may choose to tear down an explicit admission request at any time. In order for the STA to tear down an explicit admission, the STA transmits a delete traffic stream (DELTS) frame containing the TSPEC
element to the AP. If the STA receives a management notification frame with the action code set to DELTS, it disables the use of the specified AC. If an explicit admission is torn down, the STA disables the use of the AC. The Admitted Time and the Used_Time values for the AC are then both set to zero.
[0014] According to the standard, some ACs can be admitted without an admission control procedure. A STA transmits an ADDTS request to the AP to request admission of traffic in any direction (uplink, downlink, or bi-directional) for an AC that requires admission control. The STA may also have the option to transmit un-admitted traffic under the ACs for which the AP does not require admission control. Therefore, if a STA desires to send data without admission control using an AC that mandates admission control, the STA can use an AC
that corresponds to a lower priority and does not require admission control.
[0015] SUMMARY
[0016] In a wireless local area network having an access point (AP) and at least one station, wherein data is prioritized by access categories, a method for admission control begins by calculating a transmission budget for each access category (AC) and a total transmission budget for all ACs requiring admission control. A traffic stream admission request is sent from a station to the AP.
A
medium time value for the traffic stream is calculated at the AP, based on information extracted from the admission request. The medium time value is compared to the transmission budget for the AC corresponding to the traffic stream and the total transmission budget. The traffic stream is accepted if the medium time value is not greater than both the transmission budget for the AC
corresponding to the traffic stream and the total transmission budget;
otherwise, the traffic stream is rejected.
[0017] The total transmission budget includes a minimum amount of time allocated to a voice AC and a minimum amount of time allocated to a video AC.
The minimum amount of time for the voice AC and the video AC each is a percentage of the maximum transmission time available.
[001] BRIEF DESCRIPTION OF THE DRAWINGS
[0019] A more detailed understanding of the invention may be had from the following description of a preferred embodiment, given by way of example, and to be understood in conjunction with the accompanying drawings, wherein:
[0020] Figure 1 is a flowchart of a method for admission control in accordance with the present invention;
[00M] The present invention generally relates to a wireless local area network (WLAN) system, and more particularly relates to a radio resource management (RRM) admission control function of a WLAN access point (AP) and a user station.
[0004] BACKGROUND
[0005] The IEEE 802.11e standard provides modifications to the baseline IEEE 802.11 standard for the support of an admission control function at the access point (AP) of a WLAN. The standard provides the mechanisms by which a station (STA) can request admission of a traffic stream (TS) and by which the AP
can notify the STA of the admission or rejection of the request. In the initial 802.11e draft, admission control functionality existed mainly within the STA.
In a later release, this functionality has been moved to the AP and is left unspecified. As the AP decides whether to accept or deny a request for admission, the algorithm used for this determination is not specified in the standard and is left for proprietary implementation.
[0006] With respect to the AP radio resource management (RRM) admission control function, if the AP supports admission control, it uses admission control mandatory (ACM) flags advertised in the enhanced distributed coordination function (EDCF) parameter set element to indicate whether admission control is enabled for each of the access categories (ACs). In the 802.11e standard, admission control is mandatory for Voice (AC_VO) and Video (AC_VI) access categories. However, the Background (AC BK) and Best Effort (AC BE) access categories do not require admission control.
[0007] While the minimum contention window (CWmin[AC]), maximum contention window (CWmax[AC]), arbitration interframe space (AIFS[AC]), and transmit opportunity (TROP [AC] ) limit parameters may be adjusted over time by the AP, the ACM bit is static for the duration of the lifetime of the basic service set (BSS). Upon reception of an add traffic stream (ADDTS) message from a STA
with QoS functionality (QSTA), the AP (also referred to as a QAP) can decide to accept or reject the request and inform the QSTA of the decision.
[0008] With respect to QSTA admission control, each channel access function maintains two variables: Admitted_Time and Used_Time. The Admitted_Time and Used Time variables are set at association time to zero.
Admitted Time is defined as the maximum amount of medium time that the QSTA can use during a one second period. The Used_Time is maintained by the QSTA and indicates the amount of medium time that the QSTA has used. At each successful or unsuccessful transmission attempt by the QSTA, Used Time is updated by the total time required to transmit the frame, including the received acknowledge frame and the overhead in accessing the channel (SIFS interval).
At one second intervals, the Used Time is reset to 0 if it is less than or equal to the admitted time.
[0009] The STA may subsequently decide to explicitly request admission for a specific AC, which is associated with a specific IEEE 802.1D priority.
In order to make such a request, the STA transmits a traffic specification (TSPEC) element contained in an ADDTS request management frame with the following fields specified (i.e., non-zero): nominal MAC service data unit (MSDU) size for the current traffic stream in bytes; mean data rate, the average data rate in bits per second (bps); minimum physical (PHY) rate, the desired minimum PHY rate in bps; and surplus bandwidth allowance, the excess allocation of time and bandwidth over and above the stated application rate requirements. It is noted that these fields are all obtained from operations and maintenance (OA&M) data.
The Medium_Time field is not used in the request frame and is set to zero. The QSTA then waits for an ADDTS response message from the QAP.
[0010] Once the ADDTS response message is received, the QSTA evaluates it to determine if the admission request was approved. If the QAP allows the admission request, then the Medium_Time value (the transmission time available for a traffic stream) is obtained from a TSPEC element contained in the ADDTS response frame and the Admitted Time variable is set equal to the Medium Time value.
[0011] The QSTA then is free to commence frame transmission for the admitted traffic stream. The Used Time is updated each time a frame transmission is initiated as follows:
Used_Time = Used_Time + FrameExchangeTime Equation (1) where FrameExchangeTime equals the time required to transmit the frame plus one acknowledgement (ACK) frame plus one short interframe space (SIFS) interval. Every second, the Used Time is compared with the Admitted Time:
Used_Time = max((Used_Time - Admitted Time), 0) Equation (2) [0012] When the Used_Time reaches or exceeds the Admitted Time value, the corresponding channel access function no longer transmits using the EDCF
parameters for that AC, until a future interval where the Used Time reaches zero again. The 802.11e standard allows the STA to temporarily replace the EDCF parameters for that channel access function with those specified for the access categories Best Effort (AC_BE) or Background (AC BK) in order to continue transmissions at a lower priority, provided no admission control is required for those access categories.
[0013] The STA or AP may choose to tear down an explicit admission request at any time. In order for the STA to tear down an explicit admission, the STA transmits a delete traffic stream (DELTS) frame containing the TSPEC
element to the AP. If the STA receives a management notification frame with the action code set to DELTS, it disables the use of the specified AC. If an explicit admission is torn down, the STA disables the use of the AC. The Admitted Time and the Used_Time values for the AC are then both set to zero.
[0014] According to the standard, some ACs can be admitted without an admission control procedure. A STA transmits an ADDTS request to the AP to request admission of traffic in any direction (uplink, downlink, or bi-directional) for an AC that requires admission control. The STA may also have the option to transmit un-admitted traffic under the ACs for which the AP does not require admission control. Therefore, if a STA desires to send data without admission control using an AC that mandates admission control, the STA can use an AC
that corresponds to a lower priority and does not require admission control.
[0015] SUMMARY
[0016] In a wireless local area network having an access point (AP) and at least one station, wherein data is prioritized by access categories, a method for admission control begins by calculating a transmission budget for each access category (AC) and a total transmission budget for all ACs requiring admission control. A traffic stream admission request is sent from a station to the AP.
A
medium time value for the traffic stream is calculated at the AP, based on information extracted from the admission request. The medium time value is compared to the transmission budget for the AC corresponding to the traffic stream and the total transmission budget. The traffic stream is accepted if the medium time value is not greater than both the transmission budget for the AC
corresponding to the traffic stream and the total transmission budget;
otherwise, the traffic stream is rejected.
[0017] The total transmission budget includes a minimum amount of time allocated to a voice AC and a minimum amount of time allocated to a video AC.
The minimum amount of time for the voice AC and the video AC each is a percentage of the maximum transmission time available.
[001] BRIEF DESCRIPTION OF THE DRAWINGS
[0019] A more detailed understanding of the invention may be had from the following description of a preferred embodiment, given by way of example, and to be understood in conjunction with the accompanying drawings, wherein:
[0020] Figure 1 is a flowchart of a method for admission control in accordance with the present invention;
[0021] Figure 2 is a diagram of an admissible time allocation for various ACs; and [0022] Figure 3 is a flowchart of a method performed by an AP after admission of a TSPEC.
[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] A method 100 for admission control is shown in Figure 1. The Q~1P
calculates two parameters: TxBudget[AC], which is the amount of time available for admission of traffic of that AC; and Total_TxBudget, which is the amount of time available for admission of both ACM-enabled ACs (AC_VO and AC_VI; step 102).
[0025] TxBudget[AC] and Total TxBudget are defined to be:
TxBudget[AC] (sec) = TransmitLimit[AC] -Allocated_Time[AC]
Equation (3) AC VO
AC VI
Total TxBudget (sec) = a - ~ Allocated_Time [AC] Equation (4) AC
where TransmitLimit[AC] is the maximum amount of time that may be allocated for transmissions of a specific AC per one second interval.
TransmitLimit[AC] _ (3~AC~ x a Equation (5) where (3~AC] is a percentage of a (the maximum transmission time) and should be set such that at any point in time, the system is able to admit a minimum VO_Time (sec) medium time for access category AC VO and a minimum VI Time (sec) medium time for access category AC VI. The setting of (3[AC-VO] affects the minimum medium time available for AC_VI, and vice versa. Figure 2 shows the relationship between a and (3 and the admissible time available.
[0026] Allocated_Time [AC] is the amount of time that has been granted admission so far for all traffic streams (TS) under this AC.
_5_ n Allocated_Time [AC] _ Current Allocated Time-per TSB [AC] Equation (6) t~=i where n is the number of TSs admitted under category AC. Therefore, Equations (3) and (4) could be expressed as:
n TxBudget[AC] _ ((3~AC~ x a ) - Current Allocated_Time_per_TSts[AC]
ts=i Equation (7) AC V~
AC-vI n Total_TxBudget = a - ~ ~ Current Allocated Time-per TSB [AC]
Ac ts=i Equation (8) [0027] Referring back to Figure 1, a QSTA specifies its traffic stream requirements in a TSPEC, which is sent to the Q~P as an ADDTS request (step 104). The QAP extracts information from the TSPEC element contained in the ADDTS request (step 106). The QAP's admission control algorithm derives a Medium-Timets value for the requested TS transmissions of a specific AC (step 108). The Medium-Timets value is based on the information conveyed in the TSPEC element of the ADDTS request, and is calculated as follows:
Medium Timets = Surplus Bandwidth Allowance x PPS x MPDUExchangeTime Equation (9) where Surplus Bandwidth Allowance specifies the excess allocation of time (and bandwidth) over and above the stated application rates required to transport an MSDU belonging to the traffic stream. The PPS (packet per second) value and the MPDUExchange Time in Equation (9) are defined as PPS = ceiling((Mean Data Rate / 8) / Nominal MSDU Size) Equation (10) MPDUExchangeTime = duration (Nominal MSDU Size, Minimum Transmitted PHY Rate) + SIFS + ACK duration Equation (11) [0028] In Equation (10), duration( ) is the PLME-TxTIME primitive that returns the duration of a packet based on its payload size and the PHY data rate employed, SIFS is the short interframe space value, and an MPDU is a MAC
protocol data unit.
[0029] At the time of receiving the admission request, the QAP determines whether to accept or deny the admission request based on the Medium Timers, the TxBudget[AC], and Total TxBudget as follows (step 110). If both of the conditions:
Medium_Timets <= TxBudget[AC] Equation (12) Medium_Timets <= Total TxBudget Equation (13) are not satisfied, then the QAP rejects the ADDTS request (step 112) and sends an ADDTS response with "request declined" back to the QSTA (step 114). The method then terminates (step 116).
[0030] If both of the conditions are satisfied (step 110), then the QAP
ensures that it has the transmission time available to be allocated and accepts the admission request (step 118).
[0031] If the Medium Timets meets all the above criteria for admission, then the Allocated_Time[AC] is updated at the QAP as follows (step 120):
Allocated Time[AC] = Allocated_Time[AC] +
Current Allocated_Time_per_TSts [AC] Equation (13) where Current Allocated_Time_per TSts [AC] is the allocated time for this particular TSID, i.e., Current Allocated Time_per_TSts [AC] = Medium._Timets Equation (14) [0032] Consequently, this update will be reflected in both TxBudget[AC]
and Total TxBudget as shown in equations (7) and (8) above.
[0033] Having made such a determination, the QAP transmits a TSPEC
element to the requesting QSTA contained in an ADDTS response frame (step _7_ 122). Since the QAP is accepting the request, the Medium_Timets field is specified. The method then terminates (step 116).
[0034] By considering both TxBudget[AC] and Total TxBudget, the method 100 ensures that the QAP does not admit more traffic streams (or transmission time) per AC than it can support, which would achieve fairness with the other ACM-enabled AC. The method 100 also ensures that even when the first criterion is met, the total available time can still accommodate the requested Medium Timers, which would ensure some fairness to the non ACM-enabled traffic (AC BK and AC_BE) despite their lower priority in the system.
[0035] Figure 3 shows a method 300 performed by the QAP after admission of a TSPEC. First, the QAP updates a record of admitted time per AC for each QSTA, as follows (step 302):
m Admitted Time_per_QSTA[AC] _ ~ Medium_Timets [AC]
c~=i QsT~.;
Equation (15) where rrz is the number of traffic streams per QSTA under the same AC, and j is the specific QSTA.
[0036] The QAP uses a policing mechanism similar to that used in the QSTA in which it monitors its downlink transmissions and updates a variable Used_Time_per QSTA at every transmission and at every one second interval (step 304).
[0037] After each successful or unsuccessful MPDU transmission or retransmission attempt, Used_Time_per QSTA is updated according to:
Used Time_per QSTA[AC] = Used Time_per_QSTA +
MPDUExchangeTime Equation (16) [0038] At one second intervals, Used_Time_per_QSTA is updated according to:
Used_Time_per_QSTA[AC] = max ((Used Time_per QSTA -Admitted_Time_per QSTA[AC]), 0) Equation (17) _g_ [0039] In the event that a transmission occurs exactly on the one second interval, Used_Time_per QSTA[AC] is updated according to Equation (16) and then according to Equation (17).
[0040] Before the transmission of every frame, the channel access function checks if the Used_Time_per_QSTA[AC] has reached or exceeded the Admitted_Time_per QSTA[AC] value (step 306). If it is the case, then the channel access function no longer transmits using the EDCA parameters for that AC (step 308), until a future interval where the Used_Time_per QSTA[AC]
would reach zero again. The method then terminates (step 310). In an alternate embodiment, the frame is transmitted without the EDCA parameters and then the method terminates.
[0041] If the Used_Time_per_QSTA[AC] is less than the Admitted_Time_per QSTA[AC] (step 306), then the frame is transmitted using the ECA parameters (step 312) and the method terminates (step 310).
[0042] Example [0043] Below is an example showing what a QSTA could request for admitting a traffic stream (TS) under an ACM-enabled AC, and the respective Medium_TimetS calculation by the QAP.
[0044] Surplus Bandwidth Allowance: 1.1 (10% extra) [0045] Nominal MSDU Size: 1000 bytes [0046] Min. PHY Rate: 1 Mbps [0047] Mean Data Rate: 200 Kbps [0048] PPS = ceiling((Mean Data Rate / 8) / Nominal MSDU Size) 200kbps _ ~ = 25 (s_i) 1000bytes [0049] MPDUExchangeTime = duration (Nominal MSDU Size, Minimum Transmitted PHY Rate) + SIFS + ACK
- 1000byte x 8 + SIFS + ACK
lMbps _g_ = 0.008 + 10~, sec+ (24byte x 8/ ) ~lMbps = 0.008202 sec [0050] Medium-Timers - Surplus Bandwidth Allowance x PPS x MPDUExchangeTime = 1.1 x 25 x 0.008202 = 0.2255 sec = 22.55 msec [0051] Hence the requested time is 22.55 msec for a single TS. If both TxBudget[AC] and Total TxBudget are greater than 22.55 msec, then the TS is admitted. This 22.55 msec will be part of the total transmission time available for the QSTA under the requested category.
[0052] The input parameters for the admission control algorithm are shown in Table 1.
Table 1: Inputs for Contention-based Admission Control Default Symbol Description Type Range Value Minimum The minimum Config. 1 fps NA
PHY Rate PHY rate (b arameter s) Nominal MSDU size for Received Application this traffic NA
MSDU Size parameter Dependent stream (b es) Mean Data Average data Received Application NA
Rate rate (b s) arameter De endent Excess allocation of time (and Surplus bandwidth) Received Application 1.10 over Bandwidth and above the parameter Dependent 1.50 Allowance stated application rate re uirements The maximum transmission a (sec) time availableConfig. O,g sec 0 to 5 ~ 0 voice (AC-VO) parameter .
.
and video (AC_VI) traffic.
Default Symbol Description Type Range Value The percentage amount of admissible Config.
time (yAC-vo~ (fraction of parameter 80% 0 ~ 100%
a) that AC_VO
can be allocated for transmission The percentage amount of admissible Co~,.lg time [AC-VI] (fraction of parameter 80% 0 ~ 100%
a) that AC_VI
can be allocated for transmission Minimum VO Time medium time Config a * (1- 0 ~ a for *
- access categoryparameter a[AC-VI]) [~fAC-VI]
AC VO
Minimum VI Time medium time Config a * (1- 0 ~ a for *
- access categoryparameter ~[AC Vo]) a[AC-VO]
AC VI
[0053] The received parameters are taken from the ADDTS request. The value of a depends on the number of users that can be accommodated without congestions. The (3~ao-vo~ value for either AC should start below 100%;
however, it could be stretched to 100%.
[0054] The output parameters for the admission control algorithm are shown in Table 2.
Table 2: Outputs for Contention-based Admission Control Parameters Description Medium_TimetsTransmission time available for a certain traffic stream [0055] In a second embodiment of the present invention, the AP admission control operates on a per-user basis. For example, in baseline IEEE 802.11 stations (e.g., 802.11a, 802.11b and 802.11g), ACs are not utilized during admission requests, which hinders the AP from assessing TxBudget according to the method of Figure 1. Accordingly, the budget can instead be allocated according to the number of stations presently engaged by the WLAN. The budget is preferably allocated evenly among the stations. Alternatively, the budget may be allocated to each STA on a priority basis, according to standard or predetermined priority types, such as "best effort." For example, in a voice over Internet protocol (VoIP) environment, a Web browsing traffic stream may be assigned a lower priority of best effort compared to a voice traffic stream.
Under this third embodiment, the admission control algorithm preferably performs admission control upon association requests of non-802.11e compliant stations.
For example, the AP could reject all association requests in a heavily loaded BSS.
Such an admission control algorithm could be used by non-802.11e compliant APs, as well as 802.11e compliant APs for the admission control of non-802.11e compliant stations.
[0056] Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone (without the other features and elements of the preferred embodiments) or in various combinations with or without other features and elements of the present invention. While specific embodiments of the present invention have been shown and described, many modifications and variations could be made by one skilled in the art without departing from the scope of the invention. The above description serves to illustrate and not limit the particular invention in any way.
* * *
[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] A method 100 for admission control is shown in Figure 1. The Q~1P
calculates two parameters: TxBudget[AC], which is the amount of time available for admission of traffic of that AC; and Total_TxBudget, which is the amount of time available for admission of both ACM-enabled ACs (AC_VO and AC_VI; step 102).
[0025] TxBudget[AC] and Total TxBudget are defined to be:
TxBudget[AC] (sec) = TransmitLimit[AC] -Allocated_Time[AC]
Equation (3) AC VO
AC VI
Total TxBudget (sec) = a - ~ Allocated_Time [AC] Equation (4) AC
where TransmitLimit[AC] is the maximum amount of time that may be allocated for transmissions of a specific AC per one second interval.
TransmitLimit[AC] _ (3~AC~ x a Equation (5) where (3~AC] is a percentage of a (the maximum transmission time) and should be set such that at any point in time, the system is able to admit a minimum VO_Time (sec) medium time for access category AC VO and a minimum VI Time (sec) medium time for access category AC VI. The setting of (3[AC-VO] affects the minimum medium time available for AC_VI, and vice versa. Figure 2 shows the relationship between a and (3 and the admissible time available.
[0026] Allocated_Time [AC] is the amount of time that has been granted admission so far for all traffic streams (TS) under this AC.
_5_ n Allocated_Time [AC] _ Current Allocated Time-per TSB [AC] Equation (6) t~=i where n is the number of TSs admitted under category AC. Therefore, Equations (3) and (4) could be expressed as:
n TxBudget[AC] _ ((3~AC~ x a ) - Current Allocated_Time_per_TSts[AC]
ts=i Equation (7) AC V~
AC-vI n Total_TxBudget = a - ~ ~ Current Allocated Time-per TSB [AC]
Ac ts=i Equation (8) [0027] Referring back to Figure 1, a QSTA specifies its traffic stream requirements in a TSPEC, which is sent to the Q~P as an ADDTS request (step 104). The QAP extracts information from the TSPEC element contained in the ADDTS request (step 106). The QAP's admission control algorithm derives a Medium-Timets value for the requested TS transmissions of a specific AC (step 108). The Medium-Timets value is based on the information conveyed in the TSPEC element of the ADDTS request, and is calculated as follows:
Medium Timets = Surplus Bandwidth Allowance x PPS x MPDUExchangeTime Equation (9) where Surplus Bandwidth Allowance specifies the excess allocation of time (and bandwidth) over and above the stated application rates required to transport an MSDU belonging to the traffic stream. The PPS (packet per second) value and the MPDUExchange Time in Equation (9) are defined as PPS = ceiling((Mean Data Rate / 8) / Nominal MSDU Size) Equation (10) MPDUExchangeTime = duration (Nominal MSDU Size, Minimum Transmitted PHY Rate) + SIFS + ACK duration Equation (11) [0028] In Equation (10), duration( ) is the PLME-TxTIME primitive that returns the duration of a packet based on its payload size and the PHY data rate employed, SIFS is the short interframe space value, and an MPDU is a MAC
protocol data unit.
[0029] At the time of receiving the admission request, the QAP determines whether to accept or deny the admission request based on the Medium Timers, the TxBudget[AC], and Total TxBudget as follows (step 110). If both of the conditions:
Medium_Timets <= TxBudget[AC] Equation (12) Medium_Timets <= Total TxBudget Equation (13) are not satisfied, then the QAP rejects the ADDTS request (step 112) and sends an ADDTS response with "request declined" back to the QSTA (step 114). The method then terminates (step 116).
[0030] If both of the conditions are satisfied (step 110), then the QAP
ensures that it has the transmission time available to be allocated and accepts the admission request (step 118).
[0031] If the Medium Timets meets all the above criteria for admission, then the Allocated_Time[AC] is updated at the QAP as follows (step 120):
Allocated Time[AC] = Allocated_Time[AC] +
Current Allocated_Time_per_TSts [AC] Equation (13) where Current Allocated_Time_per TSts [AC] is the allocated time for this particular TSID, i.e., Current Allocated Time_per_TSts [AC] = Medium._Timets Equation (14) [0032] Consequently, this update will be reflected in both TxBudget[AC]
and Total TxBudget as shown in equations (7) and (8) above.
[0033] Having made such a determination, the QAP transmits a TSPEC
element to the requesting QSTA contained in an ADDTS response frame (step _7_ 122). Since the QAP is accepting the request, the Medium_Timets field is specified. The method then terminates (step 116).
[0034] By considering both TxBudget[AC] and Total TxBudget, the method 100 ensures that the QAP does not admit more traffic streams (or transmission time) per AC than it can support, which would achieve fairness with the other ACM-enabled AC. The method 100 also ensures that even when the first criterion is met, the total available time can still accommodate the requested Medium Timers, which would ensure some fairness to the non ACM-enabled traffic (AC BK and AC_BE) despite their lower priority in the system.
[0035] Figure 3 shows a method 300 performed by the QAP after admission of a TSPEC. First, the QAP updates a record of admitted time per AC for each QSTA, as follows (step 302):
m Admitted Time_per_QSTA[AC] _ ~ Medium_Timets [AC]
c~=i QsT~.;
Equation (15) where rrz is the number of traffic streams per QSTA under the same AC, and j is the specific QSTA.
[0036] The QAP uses a policing mechanism similar to that used in the QSTA in which it monitors its downlink transmissions and updates a variable Used_Time_per QSTA at every transmission and at every one second interval (step 304).
[0037] After each successful or unsuccessful MPDU transmission or retransmission attempt, Used_Time_per QSTA is updated according to:
Used Time_per QSTA[AC] = Used Time_per_QSTA +
MPDUExchangeTime Equation (16) [0038] At one second intervals, Used_Time_per_QSTA is updated according to:
Used_Time_per_QSTA[AC] = max ((Used Time_per QSTA -Admitted_Time_per QSTA[AC]), 0) Equation (17) _g_ [0039] In the event that a transmission occurs exactly on the one second interval, Used_Time_per QSTA[AC] is updated according to Equation (16) and then according to Equation (17).
[0040] Before the transmission of every frame, the channel access function checks if the Used_Time_per_QSTA[AC] has reached or exceeded the Admitted_Time_per QSTA[AC] value (step 306). If it is the case, then the channel access function no longer transmits using the EDCA parameters for that AC (step 308), until a future interval where the Used_Time_per QSTA[AC]
would reach zero again. The method then terminates (step 310). In an alternate embodiment, the frame is transmitted without the EDCA parameters and then the method terminates.
[0041] If the Used_Time_per_QSTA[AC] is less than the Admitted_Time_per QSTA[AC] (step 306), then the frame is transmitted using the ECA parameters (step 312) and the method terminates (step 310).
[0042] Example [0043] Below is an example showing what a QSTA could request for admitting a traffic stream (TS) under an ACM-enabled AC, and the respective Medium_TimetS calculation by the QAP.
[0044] Surplus Bandwidth Allowance: 1.1 (10% extra) [0045] Nominal MSDU Size: 1000 bytes [0046] Min. PHY Rate: 1 Mbps [0047] Mean Data Rate: 200 Kbps [0048] PPS = ceiling((Mean Data Rate / 8) / Nominal MSDU Size) 200kbps _ ~ = 25 (s_i) 1000bytes [0049] MPDUExchangeTime = duration (Nominal MSDU Size, Minimum Transmitted PHY Rate) + SIFS + ACK
- 1000byte x 8 + SIFS + ACK
lMbps _g_ = 0.008 + 10~, sec+ (24byte x 8/ ) ~lMbps = 0.008202 sec [0050] Medium-Timers - Surplus Bandwidth Allowance x PPS x MPDUExchangeTime = 1.1 x 25 x 0.008202 = 0.2255 sec = 22.55 msec [0051] Hence the requested time is 22.55 msec for a single TS. If both TxBudget[AC] and Total TxBudget are greater than 22.55 msec, then the TS is admitted. This 22.55 msec will be part of the total transmission time available for the QSTA under the requested category.
[0052] The input parameters for the admission control algorithm are shown in Table 1.
Table 1: Inputs for Contention-based Admission Control Default Symbol Description Type Range Value Minimum The minimum Config. 1 fps NA
PHY Rate PHY rate (b arameter s) Nominal MSDU size for Received Application this traffic NA
MSDU Size parameter Dependent stream (b es) Mean Data Average data Received Application NA
Rate rate (b s) arameter De endent Excess allocation of time (and Surplus bandwidth) Received Application 1.10 over Bandwidth and above the parameter Dependent 1.50 Allowance stated application rate re uirements The maximum transmission a (sec) time availableConfig. O,g sec 0 to 5 ~ 0 voice (AC-VO) parameter .
.
and video (AC_VI) traffic.
Default Symbol Description Type Range Value The percentage amount of admissible Config.
time (yAC-vo~ (fraction of parameter 80% 0 ~ 100%
a) that AC_VO
can be allocated for transmission The percentage amount of admissible Co~,.lg time [AC-VI] (fraction of parameter 80% 0 ~ 100%
a) that AC_VI
can be allocated for transmission Minimum VO Time medium time Config a * (1- 0 ~ a for *
- access categoryparameter a[AC-VI]) [~fAC-VI]
AC VO
Minimum VI Time medium time Config a * (1- 0 ~ a for *
- access categoryparameter ~[AC Vo]) a[AC-VO]
AC VI
[0053] The received parameters are taken from the ADDTS request. The value of a depends on the number of users that can be accommodated without congestions. The (3~ao-vo~ value for either AC should start below 100%;
however, it could be stretched to 100%.
[0054] The output parameters for the admission control algorithm are shown in Table 2.
Table 2: Outputs for Contention-based Admission Control Parameters Description Medium_TimetsTransmission time available for a certain traffic stream [0055] In a second embodiment of the present invention, the AP admission control operates on a per-user basis. For example, in baseline IEEE 802.11 stations (e.g., 802.11a, 802.11b and 802.11g), ACs are not utilized during admission requests, which hinders the AP from assessing TxBudget according to the method of Figure 1. Accordingly, the budget can instead be allocated according to the number of stations presently engaged by the WLAN. The budget is preferably allocated evenly among the stations. Alternatively, the budget may be allocated to each STA on a priority basis, according to standard or predetermined priority types, such as "best effort." For example, in a voice over Internet protocol (VoIP) environment, a Web browsing traffic stream may be assigned a lower priority of best effort compared to a voice traffic stream.
Under this third embodiment, the admission control algorithm preferably performs admission control upon association requests of non-802.11e compliant stations.
For example, the AP could reject all association requests in a heavily loaded BSS.
Such an admission control algorithm could be used by non-802.11e compliant APs, as well as 802.11e compliant APs for the admission control of non-802.11e compliant stations.
[0056] Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone (without the other features and elements of the preferred embodiments) or in various combinations with or without other features and elements of the present invention. While specific embodiments of the present invention have been shown and described, many modifications and variations could be made by one skilled in the art without departing from the scope of the invention. The above description serves to illustrate and not limit the particular invention in any way.
* * *
Claims (9)
1. A method for admission control in a wireless local area network having an access point (AP) and at least one station, wherein data is prioritized by access categories, the method comprising the steps of:
calculating a transmission budget for each access category (AC) at the AP;
calculating a total transmission budget for all ACs requiring admission control;
sending a traffic stream admission request from a station to the AP;
calculating a medium time value for the traffic stream at the AP, the medium time value being based on the admission request;
comparing the medium time value to the transmission budget for the AC
corresponding to the traffic stream and the total transmission budget;
accepting the traffic stream if the medium time value is not greater than both the transmission budget for the AC corresponding to the traffic stream and the total transmission budget; and rejecting the traffic stream if the medium time value is greater than one of the transmission budget for the AC corresponding to the traffic stream and the total transmission budget.
calculating a transmission budget for each access category (AC) at the AP;
calculating a total transmission budget for all ACs requiring admission control;
sending a traffic stream admission request from a station to the AP;
calculating a medium time value for the traffic stream at the AP, the medium time value being based on the admission request;
comparing the medium time value to the transmission budget for the AC
corresponding to the traffic stream and the total transmission budget;
accepting the traffic stream if the medium time value is not greater than both the transmission budget for the AC corresponding to the traffic stream and the total transmission budget; and rejecting the traffic stream if the medium time value is greater than one of the transmission budget for the AC corresponding to the traffic stream and the total transmission budget.
2. The method according to claim 1, wherein the transmission budget for each access category (AC) is the amount of time available for the admission of traffic in the AC and is equal to the total time available for the AC minus a sum of the time currently allocated to all traffic streams the AC.
3. The method according to claim 1, wherein the total transmission budget is the amount of time available for the admission of traffic on all admission control mandatory ACs and is equal to the maximum transmission time minus a sum of the time currently allocated to all traffic stream in the ACs that are admission control mandatory.
4. The method according to claim 1, wherein the total transmission budget includes:
a minimum amount of time allocated to a voice AC; and a minimum amount of time allocated to a video AC.
a minimum amount of time allocated to a voice AC; and a minimum amount of time allocated to a video AC.
5. The method according to claim 4, wherein the minimum amount of time for the voice AC and the video AC each is a percentage of the maximum transmission time available.
6. The method according to claim 1, wherein the sending step includes:
creating a traffic specification element which specifies traffic stream requirements.
creating a traffic specification element which specifies traffic stream requirements.
7. The method according to claim 1, wherein the medium time value is the transmission time available for the requested traffic stream and is calculated based on the extracted information from the admission request according to the formula:
Medium_Time = Surplus Bandwidth Allowance x PPS x MPDUExchangeTime, where Surplus Bandwidth Allowance specifies the excess allocation of time and bandwidth over and above the stated application rates required to transport a medium access control (MAC) service data unit (MSDU) belonging to the traffic stream;
PPS (packet per second) = ceiling((Mean Data Rate/8)/ Nominal MSDU
Size); and MPDUExchangeTime = duration (Nominal MSDU Size, Minimum Transmitted PHY Rate)+SIFS+acknowledgement duration, where the duration function returns the duration of a packet based on its payload size and the physical (PHY) data rate employed, and SIFS is a short interframe space value.
Medium_Time = Surplus Bandwidth Allowance x PPS x MPDUExchangeTime, where Surplus Bandwidth Allowance specifies the excess allocation of time and bandwidth over and above the stated application rates required to transport a medium access control (MAC) service data unit (MSDU) belonging to the traffic stream;
PPS (packet per second) = ceiling((Mean Data Rate/8)/ Nominal MSDU
Size); and MPDUExchangeTime = duration (Nominal MSDU Size, Minimum Transmitted PHY Rate)+SIFS+acknowledgement duration, where the duration function returns the duration of a packet based on its payload size and the physical (PHY) data rate employed, and SIFS is a short interframe space value.
8. The method according to claim 1, wherein if the traffic stream is accepted, the method further comprises the steps of:
updating the allocated time value for the AC based on the newly accepted traffic stream; and sending a response message to the station.
updating the allocated time value for the AC based on the newly accepted traffic stream; and sending a response message to the station.
9. The method according to claim 8, further comprising the steps of:
calculating a sum of medium time values for each traffic stream in the same AC;
updating a used time value per station per AC;
comparing the sum and the used time value for an AC;
transmitting a frame with existing parameters if the sum is less than the used time value; and transmitting a frame without parameters if the sum is not less than the used time value.
calculating a sum of medium time values for each traffic stream in the same AC;
updating a used time value per station per AC;
comparing the sum and the used time value for an AC;
transmitting a frame with existing parameters if the sum is less than the used time value; and transmitting a frame without parameters if the sum is not less than the used time value.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53492104P | 2004-01-08 | 2004-01-08 | |
| US60/534,921 | 2004-01-08 | ||
| US10/977,041 | 2004-10-29 | ||
| US10/977,041 US7506043B2 (en) | 2004-01-08 | 2004-10-29 | Wireless local area network radio resource management admission control |
| PCT/US2005/000130 WO2005069878A2 (en) | 2004-01-08 | 2005-01-04 | Wireless local area network radio resource management admission control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2552783A1 true CA2552783A1 (en) | 2005-08-04 |
Family
ID=34811300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002552783A Abandoned CA2552783A1 (en) | 2004-01-08 | 2005-01-04 | Wireless local area network radio resource management admission control |
Country Status (12)
| Country | Link |
|---|---|
| US (2) | US7506043B2 (en) |
| EP (1) | EP1702431B1 (en) |
| JP (2) | JP4335924B2 (en) |
| KR (2) | KR20070048786A (en) |
| CN (1) | CN101203845B (en) |
| AR (2) | AR047370A1 (en) |
| AT (1) | ATE459156T1 (en) |
| CA (1) | CA2552783A1 (en) |
| DE (1) | DE602005019534D1 (en) |
| NO (1) | NO20063590L (en) |
| TW (3) | TWI350083B (en) |
| WO (1) | WO2005069878A2 (en) |
Families Citing this family (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050152373A1 (en) * | 2004-01-08 | 2005-07-14 | Interdigital Technology Corporation | Packet scheduling in a wireless local area network |
| US7787366B2 (en) * | 2005-02-02 | 2010-08-31 | Interdigital Technology Corporation | Method and apparatus for controlling wireless medium congestion by adjusting contention window size and disassociating selected mobile stations |
| EP1694088A1 (en) * | 2005-02-22 | 2006-08-23 | Alcatel | A method for admission control for mobile networks, an admission controller and a communication system therewith |
| US20060215686A1 (en) * | 2005-03-28 | 2006-09-28 | Nokia Corporation | Communication method for accessing wireless medium under enhanced distributed channel access |
| GB2427978A (en) * | 2005-06-30 | 2007-01-10 | Nokia Corp | Setting up a direct link between peripheral and device in a WLAN |
| US7486658B2 (en) * | 2005-07-29 | 2009-02-03 | Cisco Technology, Inc. | Method and system for media synchronization in QoS-enabled wireless networks |
| JP4545662B2 (en) * | 2005-09-06 | 2010-09-15 | 日本電信電話株式会社 | Wireless LAN base station control method and base station |
| US8385193B2 (en) * | 2005-10-18 | 2013-02-26 | Qualcomm Incorporated | Method and apparatus for admission control of data in a mesh network |
| EP1793639B1 (en) * | 2005-11-30 | 2012-01-11 | NTT DoCoMo, Inc. | Call admission control device and call admission control method |
| KR100738545B1 (en) * | 2005-12-29 | 2007-07-11 | 삼성전자주식회사 | Quality of service security system and method for service type of wireless local area network |
| US7822405B2 (en) * | 2006-03-30 | 2010-10-26 | Intel Corporation | Power saving in VoIP transmission apparatus, systems, and methods |
| WO2007116337A2 (en) * | 2006-04-07 | 2007-10-18 | Nokia Corporation | 802.11k neighbor report enhancement |
| US8254253B2 (en) | 2006-07-05 | 2012-08-28 | Nokia Corporation | Conditional utilization of private short-range wireless networks for service provision and mobility |
| US9148823B2 (en) | 2006-07-05 | 2015-09-29 | Nokia Technologies Oy | Ensuring quality of service for private short-range wireless networks |
| US8902839B2 (en) | 2006-07-05 | 2014-12-02 | Nokia Corporation | Service/mobility domain with handover for private short-range wireless networks |
| KR100784539B1 (en) | 2006-08-29 | 2007-12-11 | 엘지전자 주식회사 | Terminal for controlling a function of bluetooth, and method thereof |
| JP4503625B2 (en) * | 2007-02-28 | 2010-07-14 | 日本電信電話株式会社 | Admission control method, traffic control method, and wireless LAN base station apparatus |
| US9807803B2 (en) * | 2007-03-01 | 2017-10-31 | Qualcomm Incorporated | Transmission control for wireless communication networks |
| WO2009050539A1 (en) * | 2007-10-19 | 2009-04-23 | Nokia Corporation | Radio access control utilizing quality of service access windows |
| KR100932554B1 (en) | 2007-10-23 | 2009-12-17 | 한국과학기술원 | Traffic stream admission control method and apparatus |
| US8320383B2 (en) * | 2007-10-31 | 2012-11-27 | Alcatel Lucent | Method and apparatus for providing call admission control for VoIP over wireless local area networks using a transparent proxy agent |
| US8913564B2 (en) * | 2009-09-30 | 2014-12-16 | Intel Corporation | Method and system for dynamic bandwidth allocation between networks |
| US8514707B2 (en) * | 2009-12-28 | 2013-08-20 | Tti Inventions D Llc | Non-blocking admission control |
| KR101755013B1 (en) | 2010-03-11 | 2017-07-07 | 한국전자통신연구원 | Frame structure and communication method of coordinator, source station and relay station in a wireless network system |
| US8737368B2 (en) * | 2010-04-26 | 2014-05-27 | Intel Corporation | Method, apparatus and system for switching traffic streams among multiple frequency bands |
| JP5494382B2 (en) * | 2010-09-15 | 2014-05-14 | 株式会社リコー | Access point, communication control method, program, and recording medium |
| CN102802171B (en) | 2011-05-25 | 2016-06-22 | 华为技术有限公司 | For the back-off method of wireless communication system with keep out of the way equipment |
| KR101348623B1 (en) * | 2011-12-15 | 2014-01-09 | 한국전자통신연구원 | Transmitter and receiver in wireless local area network |
| CN102594495B (en) * | 2012-03-06 | 2014-06-04 | 苏州博联科技有限公司 | Dynamic beacon interval (BI) design method based on wireless multimedia sensor networks enhanced distributed channel access (EDCA) mechanism |
| US9420610B2 (en) | 2014-07-29 | 2016-08-16 | Qualcomm Incorporated | Estimating wireless capacity |
| EP3214839B1 (en) * | 2014-11-28 | 2020-01-01 | Huawei Technologies Co. Ltd. | Method and device for transmitting multiple video streams |
| US9787491B2 (en) | 2015-03-20 | 2017-10-10 | Landis & Gyr Innovations, Inc. | Interleaved communication with resource providers and a home area network |
| EP3503661B1 (en) * | 2016-08-21 | 2021-10-27 | LG Electronics Inc. | Method for transmitting frame in wireless lan system and wireless terminal using same |
| CN107809746B (en) * | 2016-09-09 | 2021-06-04 | 松下电器（美国）知识产权公司 | Communication method, server and wireless distribution system |
| CN107809747B (en) * | 2016-09-09 | 2021-06-04 | 松下电器（美国）知识产权公司 | Communication method, radio base station, server, and radio distribution system |
| US10143000B2 (en) * | 2016-12-12 | 2018-11-27 | Landis+Gyr Innovations, Inc. | Prioritized association between child devices and parent devices operating on a time-slotted channel hopping network |
| US10264526B2 (en) * | 2017-06-07 | 2019-04-16 | Mediatek Singapore Pte. Ltd. | Adaptive TIM setup policy for client devices in power-save mode in dense environment |
| US11115881B2 (en) | 2019-08-08 | 2021-09-07 | Landis+Gyr Innovations, Inc. | Heterogeneous networks using two channel hopping protocols |
| WO2022115467A1 (en) * | 2020-11-25 | 2022-06-02 | Intel Corporation | A framework for exchanging quality of service (qos) policies and resource availability in a wireless network |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI100158B (en) * | 1995-11-09 | 1997-09-30 | Nokia Telecommunications Oy | Traffic control in a telecommunication system |
| US5982748A (en) * | 1996-10-03 | 1999-11-09 | Nortel Networks Corporation | Method and apparatus for controlling admission of connection requests |
| US6028842A (en) * | 1996-12-23 | 2000-02-22 | Nortel Networks Corporation | Dynamic traffic conditioning |
| US6366559B1 (en) * | 1997-06-06 | 2002-04-02 | Telcordia Technologies, Inc. | Method and system for state-dependent admission control and routing of multi-rate circuit-switched traffic |
| US6216006B1 (en) | 1997-10-31 | 2001-04-10 | Motorola, Inc. | Method for an admission control function for a wireless data network |
| US6898180B2 (en) | 1999-06-08 | 2005-05-24 | Nokia Corporation | Connection admission in a communications network |
| US6882623B1 (en) * | 2000-02-08 | 2005-04-19 | Native Networks Technologies Ltd. | Multi-level scheduling method for multiplexing packets in a communications network |
| AU2002216279A1 (en) | 2000-12-27 | 2002-07-08 | Cellglide Technologies Corp. | Resource allocation in cellular telephone networks |
| CN1137561C (en) * | 2001-02-20 | 2004-02-04 | 智捷科技股份有限公司 | Signal transmission method in radio network |
| US20030093526A1 (en) * | 2001-11-13 | 2003-05-15 | Koninklijke Philips Electronics N. V. | Apparatus and method for providing quality of service signaling for wireless mac layer |
| US7423966B2 (en) * | 2002-11-07 | 2008-09-09 | Sharp Laboratories Of America, Inc. | Prioritized communication bandwidth-sharing management for plural-station wireless communication system |
| US7426180B2 (en) * | 2002-11-08 | 2008-09-16 | Sharp Laboratories Of America, Inc. | Rapid build transmission-limit method and structure for BSS stations in wireless communication network |
| US7366126B2 (en) * | 2002-11-08 | 2008-04-29 | Sharp Laboratories Of America, Inc. | Modified-beacon, bandwidth-access control in wireless network communication system |
| US7403531B2 (en) * | 2003-05-30 | 2008-07-22 | Texas Instruments Incorporated | WLAN admission control for multimedia service |
| JP2006528861A (en) * | 2003-07-24 | 2006-12-21 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Admission control method for wireless network based on guaranteed transmission rate |
| US7317682B2 (en) * | 2003-09-04 | 2008-01-08 | Mitsubishi Electric Research Laboratories, Inc. | Passive and distributed admission control method for ad hoc networks |
| TWI390904B (en) * | 2003-11-05 | 2013-03-21 | Interdigital Tech Corp | Quality of service management for a wireless local area network |
| US20060099933A1 (en) * | 2004-06-16 | 2006-05-11 | Avaya Technology Llc | Call admission control of a shared-access resource during a handover |
| US8665714B2 (en) * | 2004-06-16 | 2014-03-04 | Avaya Inc. | Call admission control of shared-access resources through a call-handling server |
| US7801043B2 (en) * | 2005-04-01 | 2010-09-21 | Interdigital Technology Corporation | Method and apparatus for admission control and resource tracking in a wireless communication system |
| US8385193B2 (en) * | 2005-10-18 | 2013-02-26 | Qualcomm Incorporated | Method and apparatus for admission control of data in a mesh network |
-
2004
- 2004-10-29 US US10/977,041 patent/US7506043B2/en not_active Expired - Fee Related
-
2005
- 2005-01-04 KR KR1020077006014A patent/KR20070048786A/en not_active Application Discontinuation
- 2005-01-04 TW TW094123823A patent/TWI350083B/en not_active IP Right Cessation
- 2005-01-04 CA CA002552783A patent/CA2552783A1/en not_active Abandoned
- 2005-01-04 DE DE602005019534T patent/DE602005019534D1/en active Active
- 2005-01-04 TW TW094100193A patent/TWI269554B/en not_active IP Right Cessation
- 2005-01-04 CN CN2005800017266A patent/CN101203845B/en not_active Expired - Fee Related
- 2005-01-04 KR KR1020067015894A patent/KR20070012339A/en not_active IP Right Cessation
- 2005-01-04 JP JP2006549346A patent/JP4335924B2/en not_active Expired - Fee Related
- 2005-01-04 TW TW098101114A patent/TW200947961A/en unknown
- 2005-01-04 WO PCT/US2005/000130 patent/WO2005069878A2/en active Application Filing
- 2005-01-04 AT AT05704962T patent/ATE459156T1/en not_active IP Right Cessation
- 2005-01-04 EP EP05704962A patent/EP1702431B1/en not_active Not-in-force
- 2005-01-07 AR ARP050100045A patent/AR047370A1/en active IP Right Grant
-
2006
- 2006-08-08 NO NO20063590A patent/NO20063590L/en not_active Application Discontinuation
-
2007
- 2007-07-06 AR ARP070103011A patent/AR061956A2/en not_active Application Discontinuation
-
2009
- 2009-03-13 US US12/403,965 patent/US8108505B2/en not_active Expired - Fee Related
- 2009-05-01 JP JP2009112245A patent/JP2009177839A/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP1702431B1 (en) | 2010-02-24 |
| CN101203845A (en) | 2008-06-18 |
| CN101203845B (en) | 2010-05-05 |
| US8108505B2 (en) | 2012-01-31 |
| DE602005019534D1 (en) | 2010-04-08 |
| US7506043B2 (en) | 2009-03-17 |
| KR20070048786A (en) | 2007-05-09 |
| WO2005069878A3 (en) | 2007-06-28 |
| ATE459156T1 (en) | 2010-03-15 |
| EP1702431A4 (en) | 2008-03-05 |
| TW200947961A (en) | 2009-11-16 |
| TWI350083B (en) | 2011-10-01 |
| TWI269554B (en) | 2006-12-21 |
| JP4335924B2 (en) | 2009-09-30 |
| TW200524346A (en) | 2005-07-16 |
| US20090168717A1 (en) | 2009-07-02 |
| NO20063590L (en) | 2006-08-08 |
| KR20070012339A (en) | 2007-01-25 |
| JP2009177839A (en) | 2009-08-06 |
| TW200629801A (en) | 2006-08-16 |
| JP2007532047A (en) | 2007-11-08 |
| EP1702431A2 (en) | 2006-09-20 |
| AR061956A2 (en) | 2008-08-10 |
| WO2005069878A2 (en) | 2005-08-04 |
| AR047370A1 (en) | 2006-01-18 |
| US20050197148A1 (en) | 2005-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8108505B2 (en) | Wireless local area network radio resource management admission control | |
| US7525915B2 (en) | Quality of service management for a wireless local area network | |
| JP4401352B2 (en) | Scheduler system and method thereof | |
| US7123627B2 (en) | Class of computationally parsimonious schedulers for enforcing quality of service over packet based AV-centric home networks | |
| US7801043B2 (en) | Method and apparatus for admission control and resource tracking in a wireless communication system | |
| JP4545662B2 (en) | Wireless LAN base station control method and base station | |
| EP1797673B1 (en) | Network array, forwarder device and method of operating a forwarder device | |
| JP4335219B2 (en) | Wireless LAN traffic priority control method and apparatus | |
| Yoon et al. | Dynamic admission control in IEEE 802.11 e EDCA-based wireless home network | |
| MXPA06007699A (en) | Wireless local area network radio resource management admission control | |
| Liu et al. | Dynamic admission and congestion control for real-time traffic in IEEE 802.11 e wireless LANs | |
| Villalón et al. | A novel IEEE 802.11 e-based QoS protocol for voice communications over WLANs | |
| Portoles et al. | Implementation of a QoS management mechanism to support applied algorithms on an IEEE 802.11 WLAN test-bed | |
| WO2006026291A1 (en) | Method and system for a quality of service mechanism for a wireless network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |