CN1784865A - System and method for measurement report time stamping to ensure reference time correctness - Google Patents
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Abstract
A system and method is provided that resolves a possible ambiguity in WLAN measurement reports by having a measuring entity include timer values in returned measurement reports. The time a measurement was requested to be performed and the actual time it was done by a measuring entity can be compared by the receiver to ensure that no ambiguities occurred.
Description
The present invention relates to local area network communication, and more specifically, relate to system and method the measurement report application time marking that guarantees correctness fiducial time.
The change example that two kinds of WLAN are arranged usually: based on foundation structure with ad hoc type.In the former network, communication typically only the radio node that is called as station (STA) with also be generation between the access point (AP) of STA, they form basic service set (BSS) together.In ad hoc type network, communication directly occurs between the radio node, and these radio nodes form independently basic service set (IBSS).
In WLAN, request can measured and reporting measurements between the STA of Radio Measurement.Measurement on non-service channel is a special measurement, needs the STA that measures to interrupt its normal operation, switching channels and obtain the Radio Measurement value.Measurement on service channel is carried out as concurrent measurement by STA.Though the STA that can measure is responsible for deciphering with each measurement report frame of decipher and assesses its Effect on Performance for itself, but some is measured the execution of request and chooses wantonly, if and its execution meeting significantly worsens the performance of STA, then can ignore it by the STA that receives.
STA itself can measure one or more channels or STA can ask other STA in same BSS or IBSS to represent it to measure one or more channels.When other STA of request measured one or more channel, STA utilized the measurement request frame of wherein stipulating at least one measurement request elements.
IEEE (IEEE) 802.11-1999 standard is the consensus standard that is used for WLAN (WLAN), it pays close attention to medium access control (MAC) and physics (PHY) layer, incorporate this paper by reference at this, just as it being set forth in full at this.One incorporates this paper into by reference at this in the IEEE 802.11 (h) of standard hereto and 802.11 (k) rough draft additional project, and just a measurement asks to comprise the time reference when measurement of regulation request begins as at this it is set forth in full.For example, shown in Figure 1A, measured deviation parameter 100 and starting delay parameter 101 are defined in the fiducial time among IEEE TGh and the TGk together.The starting time-delay is the measurement starting time-delay in a plurality of target beacon transmit time (TBTT), and measured deviation is the measured deviation in timer units (TU).Figure 1B shows the measurement request of permission.
Because channel condition can be attempted once abovely, the request of measuring is sent to station, destination (STA).At the STA place that receives, if receive the more than one copy of same measurement request, then STA abandons the repeated packets of up-to-date reception.It follows the agreement of IEEE 802.11 standard codes.
According to IEEE 802.11 agreements, the abandoning of repeating frame at the STA place that receives may cause the STA with receiving that asks to have different reference beacon respectively, and each reference measurement values picks up counting from this reference beacon.For example, if being predefined in the beacon period, the request of measurement is sent out, and because channel condition, the STA that receives correctly receives this frame but its ACK (replying) is not received at the STA place that sends, if and the request of measuring subsequently successfully transmission in another beacon period, it is different then locating reference beacon in dispatching station with receiving station.
It is a kind of by timer numerical value being included in the method and system that solves the ambiguity in the WLAN measurement report in the measurement report that embodiments of the invention provide.Time and actual time of measuring that measurement is carried out in request are compared by the requestor, to guarantee not occur ambiguity.At the embodiments of the invention that are used for IEEE 802.11 WLAN, time synchronized function (TSF) timer numerical value is included in the measurement report.
In a preferred embodiment, by revising measurement report frame and unit to comprise field with absolute time benchmark.For IEEE 802.11 WLAN, the absolute time benchmark is to work as the measurement of the being asked numerical value of the TSF time (or its part) when beginning.In all embodiment, compare between time that predetermined (request) begins to measure and the time of measuring actual beginning, the agreement ambiguity does not appear with assurance.
Figure 1A shows that request sends to the request of measuring the parameter of the service primitive of the peer-entities among the WLAN;
Figure 1B is presented at the measurement request that allows among the WLAN;
Fig. 2 A is the simplified block diagram that shows the structure of basic service set (BSS) wireless communication system that wherein can use embodiments of the invention;
Fig. 2 B shows the ad hoc type simplified block diagram of the structure of basic service set (IBSS) wireless communication system independently that wherein can use embodiments of the invention;
Fig. 3 is presented at according to the specific basic service set (BSS) of embodiments of the invention or the independently access point (AP) in the basic service set (IBSS) and the simplified block diagram of each station (STA);
Fig. 4 shows the measurement report frame format according to embodiments of the invention;
Fig. 5 A shows the measurement report element form according to embodiments of the invention; And
Fig. 5 B shows the measurement report pattern field according to measurement report element embodiments of the invention, shown in Fig. 5 A.
In the following description, as an illustration rather than restriction, set forth concrete details,, well understand of the present invention so that provide such as concrete structure, interface, technology or the like.Yet, it will be apparent to those skilled in the art that the present invention can implement in being different from other wireless network embodiment of these details.
Fig. 2 A is representative basis structure basic service set (BSS) wireless communication system that wherein can use embodiments of the invention.Shown in Fig. 2 A, access point (AP) 200 is coupled to a plurality of mobile radio station (STA
i) 201, they are communicated by letter with AP by Radio Link 202 mutual communication and via a plurality of wireless channels.The principle of key of the present invention has provided a kind of giving by STA
iThe report of 201 measurements that obtain adds the mechanism of the time marking, so that can avoid agreement ambiguity (if they take place), so, make and might after this fact, take correct action.Should be noted that: for the purpose of example, the network shown in Fig. 2 is very little.In fact, most of network will comprise the mobile radio station STA of much bigger number
i201.Fig. 2 B is representative ad hoc type basic service set (IBSS) wireless communication system independently that wherein can use embodiments of the invention.Shown in Fig. 2 B, a plurality of mobile radio station (STA
i) 201 need not any AP by Radio Link 202 mutual communication.
With reference to Fig. 3, AP 200 and each STA in the WLAN of Fig. 2 A
i201 can comprise the system of a structure shown in the block diagram with Fig. 3.AP 200 and each STA
i201 can comprise receiver 301, demodulator 302, measuring circuit 303, memory 304, processor controls 305, timer 306, modulator 307 and transmitter 308.The example system 300 of Fig. 3 is only used for illustrative purposes.Use normally used term when describing particular mobile station though the gathering of calligraphers is described, these are described and notion similarly can be applicable to other treatment system, comprise having the system that is different from structure shown in Figure 3.
In a preferred embodiment, receiver 301 and transmitter 308 are coupled to the antenna (not shown), via demodulator 302 measurement report that receives are transformed into the corresponding digital data and send the measurement request of wanting via modulator 307 respectively.Measurement acquisition circuit is operated under the control of processor 305, the measurement report frame that receives with processing, comprise measured value and corresponding time-stamp, or that carry out being asked or periodic measure (independently), measured value is transferred together with corresponding time-stamp in measurement report frame therein.Figure 1B shows for the possible requestor of IBSS of the present invention and BSS IEEE 802.11 wlan implementation examples and gauger's combination.Timer 306 is used in the time-stamp that the measurement time started that expression reported is set in the measurement report frame.
Fig. 4 shows the form according to the measurement report frame body 400 of the preferred embodiments of the present invention.In IEEE 802.11 wlan implementation examples of the present invention, measurement report frame body 400 usage operation frames (Action Frame) physique formula, and send by STA 201 in response to measurement request frame, or send by the STA 201 that metrical information independently is provided.In all embodiment, kind field 401 is set to equal the numerical value of an expression Radio Measurement kind or spectrum management category.Action field 402 is set to equal the numerical value that an expression wherein comprises measurement report.Dialog token field 403 is set to equal the numerical value in corresponding measurement request frame.If measurement report frame 400 is not sent out in response to measurement request frame, then dialog token field 403 is set to zero.In a preferred embodiment, the time-stamp field 404 of at least one (1) measurement report frame numerical value and (2) at least one measurement report element 405500 of comprising the absolute time benchmark when STA begins to measure the measured value of first report is coupled with time-stamp 504.Measurement report elements field 405 comprises at least one measurement report element 500, shown in Fig. 5 A.The length of the number of measurement report element 500 and the measurement report elements field in measurement report frame 400 405 is subjected to the restriction of maximum medium access control (MAC) management protocol data unit (MMPDU) size that allows.
Each measurement report element 500 comprises the measurement report of the measurement of being made by STA 201.Fig. 5 B shows the form of the measurement report element 500 of preferred embodiment.Unit id field 501 is set to by the identifier of corresponding measurement request appointment (for example, according to IEEE 802.11 standards, it is 39 for measurement report).Length field 502 is variable, and it depends on the length of measurement report field 507.The minimum value of length field be 3 (for example, the report measurement pattern equal can not with or be rejected, and use distance of zero mark degree measurement report field).Measurement token field 503 is set to equal the measurement markers measured in the request corresponding.If the surveying record unit is independently sent by STA, then measurement token field 503 is set to equal zero.Time-stamp district 504 is set to when each measuring unit for report in measurement report frame 400, the numerical value of absolute timer when the measurement of request begins, and it is the TSF timer for IEEE802.11 embodiment of the present invention.Each or the two of should be pointed out that time-stamp field 404 and 504 can appear in the measurement report.
Owing to comprise time 504 of the reality of measuring unit 500, improved the confidence level of measuring, and when several STA 201 reported identical measured value in the real times 504 of approaching but different time, this confidence level improved further.In addition, the frequency of that send and measurement report request, help guiding STA 201 when asking and making measurement report, for example, if being reported in 1:00 and 1:05 is received by STA 201, then STA 201 can be at 1:10 request or reporting measurements, obtains or provide the reliable measured value of given unit respectively.
Though the preferred embodiments of the present invention are shown and describe, it will be apparent to those skilled in the art that and under the condition that does not deviate from scope of the present invention, to make various changes and correction and can be with the unit of equivalent alternative embodiment.In addition, can make many corrections and adapt to specific situation of the present invention and instruction, and not deviate from its center range.So, the invention is not restricted to be used to the specific embodiment that realizes that best pattern of the present invention is disclosed, but the present invention includes all embodiment in the scope that belongs to claims as expection.
Claims (19)
1. method that is used between a plurality of stations (201) of wireless lan (wlan) creating measurement report may further comprise the steps:
Receive the measurement request that (301) will make in the given time by the station that can measure (201) in described a plurality of stations (201) at least one measurement report element (500);
By this station that can measure (201) record described at least one measurement report element (500);
Comprise the measurement report (400) of described at least one measurement report element (500) by this station that can measure (201) establishment as one of the measurement report element that wherein comprises (405);
Add time-stamp (404,504) at least one item in described at least one measurement report element that is write down (500) and the described measurement report (400) respectively with the absolute time benchmark; And
Send the measurement report of (308) described establishment by this station that can measure.
2. the process of claim 1 wherein that the described step that adds the time marking also comprises the step that is set to time synchronized function (TSF) timer numerical value (306) by each described absolute time benchmark of the station that can measure.
3. the method for claim 1, further comprising the steps of:
(504) add the time marking if at least one measuring unit has been used the absolute time benchmark,
Then determine the described absolute time benchmark (504) the earliest of measurement report element by the station that can measure (201), and
Described measurement report time-stamp (404) is set to the absolute time benchmark the earliest of described definite measurement report element by the station that can measure (201).
4. the method for claim 3, the step that wherein adds the time marking also comprises the step that is set to time synchronized function (TSF) timer numerical value (306) by the station that can measure (201) each described absolute time.
5. the process of claim 1 wherein that described foundation step comprises that also an a plurality of field that are formatted as one of following form is included in the step in the described measurement report:
Kind 401 Action 402 Dialogue mark 403 404 of reservation Measurement report element 405
Eight hytes: 1118 variable and
These fields are-
Kind field (401) is set to equal a numerical value of representing Radio Measurement kind or spectrum management category,
Action field (402) is set to equal the numerical value that an expression wherein comprises measurement report (500),
Dialog token field (403) is set to equal the numerical value measured in the request corresponding, if or not in response to the request of measuring and send measurement report, then be not set to zero,
Optional time-stamp field comprises the numerical value of the absolute time benchmark (306) when first measurement of the measurement report element of reporting in the measurement report (400) (405) is carried out at the station that can measure, and
Measurement report elements field (405), it comprises a plurality of described measurement report element 500, and described number is 1 at least, and described measurement report elements field (405) has length and a plurality of son field of combination, and is formatted as
Unit ID 501 Length 502 Measurement markers 503 Time-stamp 504 Measurement pattern 505 Measure type 506 Measurement report 507
Eight hytes: 111811 is variable
These son fields are-
Unit ID son field (501) is set to be assigned to the identifier of the measurement report of being asked,
Length son field (502), it is variable, minimum value is 3.
Measurement markers son field (503) is set to equal the measurement markers in the corresponding measurement request elements of the request of measuring, if or measurement report element independently send by the station that can measure, then measurement markers (503) field is set to equal zero,
Optional time-stamp field (504) is set to work as the numerical value of the absolute timer (306) of the measurement of being reported when beginning,
Measurement pattern son field (505) is a bit field of describing the type of the measurement request of having done,
Measure type son field (506), be set to represent the identifier of the type of the request of measuring, and
Measurement report field (507) comprises at least one measurement report element (500),
Wherein there be at least one in the measurement report time-stamp (404) and the measuring unit report time marking (504).
6. the method for claim 5, wherein:
WLAN is IEEE 802.11WLAN;
Unit ID (501) is set to the unique identifier by IEEE 802.11 prescribed by standard;
Each time-stamp field (404,504) is time synchronized function (TSF) timer numerical value (306); And
The length of the combination of measurement report element (405) is less than or equal to maximum medium access control (MAC) management protocol data unit (MMPDU) size that allows.
7. method that is used between a plurality of stations (201) of WLAN (wireless local area network) creating the autonomous measurement report (400) with at least one measurement report element (500) may further comprise the steps:
Write down at least one predetermined measurement report element (500) by the station that can measure (201) in described a plurality of stations (201);
Randomly described at least one measurement report element that is recorded is added time-stamp by this station that can measure (201) with the absolute time benchmark;
Create the autonomous measurement report (400) that comprises described at least one measurement report element (500) by this station that can measure;
Randomly the absolute time benchmark with the earliest time that is comprised in measurement report element wherein adds time-stamp to described autonomous measurement report (400); And
Send (308) described autonomous measurement reports (400) by the station that can measure,
At least one in wherein said autonomous measurement report time-stamp (504) and described at least one measurement report element time-stamp (404) is included in the described autonomous measurement report (400).
8. the method for claim 7, wherein each described step that adds the time marking also comprises the step that each described absolute time marking (404,504) is set to time synchronized function (TSF) timer numerical value by the station that can measure (201).
9. the method for the correctness of the time reference of a measurement that is used for the request between a plurality of stations of wireless lan (wlan) (STA) (201) that guarantees may further comprise the steps:
Send (308) request by first stop (201) for the measurement report element of at least one time-stamp that will carry out in the given time;
Receive (301) by second station and measure request and corresponding measurement report (400), described measurement report comprises at least one measurement report element (500) and at least one time-stamp (404 of being asked, 504), comprise when the absolute time benchmark of the measurement that is recorded in it (507) when finishing;
By second station (201) this given time and at least one time-stamp (404,504) of measuring request is compared, to determine the correctness of time-stamp.
10. the method for claim 9, wherein said receiving step also are included in the step that receives a plurality of fields that are formatted as one of following form in the described measurement report (400):
Kind 401 Action 402 Dialogue mark 403 404 of reservation Measurement report element 405
Eight hytes: 1118 variable and
Kind 401 Action 402 Dialogue mark 403 Time-stamp 404 Measurement report element 405
Eight hytes: 1118 is variable
These fields are-
Kind field (401) is set to equal a numerical value of representing Radio Measurement kind or spectrum management category,
Action field (402) is set to equal the numerical value that an expression wherein comprises measurement report,
Dialog token field (403) is set to equal the numerical value measured in the request corresponding, if or not in response to the request of measuring and send measurement report, then be not set to zero,
Optional time-stamp field (404), it comprises the numerical value of the timer (306) when the station that can measure begins to measure the measurement of first report;
Measurement report elements field (405) comprises a plurality of described measurement report element (500), and described number is 1 at least, and described measurement report elements field (405) has length and a plurality of son field of combination, and is formatted as
Unit ID 501 Length 502 Measurement markers 503 Time-stamp 504 Measurement pattern 505 Measure type 506 Measurement report 507
Eight hytes: 111811 is variable
These son fields are-
Unit ID son field (501) is set to an identifier that is assigned to the measurement report of request,
Length son field (502), it is variable, minimum value is 3.
Measurement markers son field (503) is set to equal the measurement markers in corresponding measurement request elements, if or measurement report element (500) independently send by the station that can measure (201), then measurement token field (503) is set to equal zero,
Optional time-stamp field (504) is set to work as for each measuring unit of reporting in the measurement report frame, the numerical value of the absolute timer (306) the when measurement of request begins,
Measurement mode field (505) is a bit field of describing the type of the measurement request of having done,
Measure type field (506), be set to represent the numeral of the type of the measurement reported, and
Measurement report field (507) comprises the measurement of being reported,
Wherein there be at least one in the measurement report time-stamp and the measuring unit report time marking.
11. the method for claim 10, wherein:
WLAN is IEEE 802.11WLAN;
Unit ID (501) is set to the unique identifier by the setting of IEEE 802.11 standards;
Each time-stamp (504) is time synchronized function (TSF) timer numerical value (306); And
The length of the combination of measurement report element is less than or equal to maximum medium access control (MAC) management protocol data unit (MMPDU) size that allows.
12. the method for claim 10, wherein said reception (301) step is further comprising the steps of: receive the measurement report with each the described time-stamp (404,405) that is provided with by synchronizing function service time (TSF) timer numerical value (306).
13. carry out the equipment of resource measurement between a plurality of stations that a kind is arranged in wireless lan (wlan), comprising:
Receiver (301) is used to receive the signal that enters;
Measurement acquisition circuit (303), the resource that is used to measure wherein the described signal that enters that receives is with as at least one measurement report element (500);
Timer (306) provides the absolute time benchmark;
Processor controls (305), be coupled to described measurement acquisition circuit (303) and described timer (306) and begin, be configured to obtain at least one measurement report element of the signal that enters and randomly (1) first measured in the absolute time benchmark (306) of the absolute time benchmark (306) of beginning of (500) and (2) beginning of (507) each measurement report element of reporting therein one and measurement report element time-stamp (504) and interrelated as what time-stamp (404) report measurement report (400) in predetermined absolute time.
14. the equipment of claim 13 also comprises:
Memory (304) is coupled to described processor controls (305), is used for storing the described measurement report element that obtains (500) and randomly stores described relevant measurement report element time-stamp (504); And
Wherein said processor controls (305) also is configured to relatively more predetermined absolute time and at least one described absolute time marking (404,504), to determine the correctness of described at least one absolute time marking (404,504).
15. the equipment of claim 14 also comprises transmitter, its transmission comprises the measurement report of a plurality of fields that are formatted as one of following form:
Kind 401 Action 402 Dialogue mark 403 404 of reservation Measurement report element 405
Eight hytes: 1118 variable and
Kind 401 Action 402 Dialogue mark 403 Time-stamp 404 Measurement report element 405
Eight hytes: 1118 is variable
These fields are-
Kind field (401) is set to equal a numerical value of representing Radio Measurement kind or spectrum management category,
Action field (402) is set to equal the numerical value that an expression wherein comprises measurement report (500),
Dialog token field (403) is set to equal the numerical value measured in the request corresponding, if or not in response to the request of measuring and send measurement report, then be not set to zero,
Optional time-stamp field (404) comprises the numerical value of the timer (306) when the station that can measure begins to measure the measurement of first report;
Measurement report elements field (405) comprises a plurality of described measurement report element (500), and described number is 1 at least, and described measurement report elements field (405) has length and a plurality of son field of combination, and is formatted as
Unit ID 501 Length 502 Measurement markers 503 Time-stamp 504 Measurement pattern 505 Measure type 506 Measurement report 507
Eight hytes: 111811 is variable
These son fields are-
Unit ID son field (501) is set to an identifier that is assigned to the measurement report of request,
Length son field (502), it is variable, minimum value is 3.
Measurement markers son field (503), it is set to equal the measurement markers in the corresponding measurement request elements, if or measurement report element (500) independently send by the station that can measure (201), then measurement token field (503) is set to equal zero,
Optional time-stamp field (504) is set to work as for each measuring unit of reporting in the measurement report frame, the numerical value of the absolute timer (306) the when measurement of being reported begins,
Measurement mode field (505) is a bit field of describing the type of the measurement request of having done,
Measure type field (506), be set to represent the numeral of the type of the measurement reported, and
Measurement report field (507) comprises the measured value of being reported,
Wherein there be at least one in the measurement report time-stamp and the measuring unit report time marking.
16. the equipment of claim 15, wherein:
WLAN is IEEE 802.11WLAN;
Unit ID (501) is set to the unique identifier by IEEE 802.11 standard codes;
Each described time-stamp (404,504) is time synchronized function (TSF) timer numerical value (306); And
The length of the combination of measurement report element is less than or equal to maximum medium access control (MAC) management protocol data unit (MMPDU) size that allows.
17. the equipment of claim 15, also comprise receiver (301), be used to receive a request of measuring, this measurements request comprises to be wanted measured and as measurement report element (500) and at least one measurement request elements reported and the preset time that begins to measure.
18. the equipment of claim 17, wherein measured request are to be sent by the station (201) at described a plurality of stations (201).
19. the equipment of claim 17, wherein measured request are to be sent by the access point (200) at described a plurality of stations (201).
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US46919403P | 2003-05-09 | 2003-05-09 | |
| US60/469,194 | 2003-05-09 | ||
| US50384903P | 2003-09-17 | 2003-09-17 | |
| US60/503,849 | 2003-09-17 | ||
| PCT/IB2004/001466 WO2004100450A1 (en) | 2003-05-09 | 2004-05-03 | System and method for measurement report time stamping to ensure reference time correctness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1784865A true CN1784865A (en) | 2006-06-07 |
| CN1784865B CN1784865B (en) | 2013-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200480012525.1A Expired - Lifetime CN1784865B (en) | 2003-05-09 | 2004-05-03 | Method for measurement report time stamping to ensure reference time correctness |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1784865B (en) |
| UA (1) | UA90995C2 (en) |
| ZA (1) | ZA200509023B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104995947A (en) * | 2013-02-14 | 2015-10-21 | 高通股份有限公司 | Receiver measurement assisted access point control |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6345043B1 (en) * | 1998-07-06 | 2002-02-05 | National Datacomm Corporation | Access scheme for a wireless LAN station to connect an access point |
| US6385173B1 (en) * | 1999-02-16 | 2002-05-07 | Telefonaktiebolaget L M Ericsson (Publ) | Adaptive control of telecommunications systems with measurements of varying time-delays |
| FI111113B (en) * | 1999-11-18 | 2003-05-30 | Nokia Corp | Dissemination of measurement data in a communication system |
| FR2811848A1 (en) * | 2000-07-13 | 2002-01-18 | Thomson Multimedia Sa | SYSTEM, METHOD AND DEVICE FOR TIMING AND VERIFYING HORODATE VALIDITY IN A DIGITAL BROADCASTING ENVIRONMENT |
| US7206840B2 (en) * | 2001-05-11 | 2007-04-17 | Koninklike Philips Electronics N.V. | Dynamic frequency selection scheme for IEEE 802.11 WLANs |
-
2004
- 2004-05-03 CN CN200480012525.1A patent/CN1784865B/en not_active Expired - Lifetime
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104995947A (en) * | 2013-02-14 | 2015-10-21 | 高通股份有限公司 | Receiver measurement assisted access point control |
| CN104995946A (en) * | 2013-02-14 | 2015-10-21 | 高通股份有限公司 | Receiver measurement assisted access point control |
| CN104995947B (en) * | 2013-02-14 | 2019-06-07 | 高通股份有限公司 | Receiver measures the control of assist type access point |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1784865B (en) | 2013-07-17 |
| ZA200509023B (en) | 2007-04-25 |
| UA90995C2 (en) | 2010-06-25 |
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