CN1784866B - System and method for specifying measurement request start time - Google Patents
System and method for specifying measurement request start time Download PDFInfo
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- CN1784866B CN1784866B CN200480012526.6A CN200480012526A CN1784866B CN 1784866 B CN1784866 B CN 1784866B CN 200480012526 A CN200480012526 A CN 200480012526A CN 1784866 B CN1784866 B CN 1784866B
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Abstract
The present invention relates to specification of the start time for taking measurements in wireless local area networks (WLAN), in which the start time of measurements to be taken is included in a Measurement Start Time field of a Measurement Request Frame and the interpretation of the start time for a specific measured element is determined by a Mode field included in each Measurement Request Element field of the Measurement Request Frame. Optionally, the start time of a Measurement Request Frame is specified using a time synchronization function (TSF) timer value or part thereof in order to avoid ambiguities in interpretation of the start time reported.
Description
The present invention relates to stipulate to being used for explanation in the time started that wireless lan (wlan) is measured.The said time started is stipulated so that eliminate possible ambiguity by time synchronized function (TSF (timesynchronization function)) timer value or its part.
Usually, have two types wireless lan (wlan), based on foundation structure with special (ad-hoc) or independently.In Fig. 2 A illustrated former network, wherein communication only occurs in radio node and (is called as station (STA in typical case
i) 201) and access point (AP (access point)) between 200, and communication occurs in radio node STA in the illustrational latter's network of Fig. 2 B institute
iBetween 201.STA in the same radio overlay area
i201 with AP 200 be called as Basic Service Set (BSS).In second type WLAN, direct communication and wherein do not have the STA of AP each other
i201 are called as independently Basic Service Set or IBSS together.
IEEE 802.11 standards are WLAN regulation medium access control (MAC) and physical characteristic so that support physical layer element.In the international standard ISO/IEC 8802-11 " Information Technology-Telecommunications andInformation Exchange Area Networks " that [1] 1999 publishes, IEEE 802.11 standards have been defined; Therefore being introduced into for your guidance, just looks like it intactly have been set forth the same at this.
In the IEEE802.11h [2] of IEEE 802.11 standards appendix; All introduce for your guidance in this whole contents said appendix; Just look like at this it intactly have been set forth equally, measurement request comprises the time reference that is used to stipulate when will carry out the measurement of asking.For example, ' measuring skew (Measurement Offset) ' stipulates the fiducial time among the IEEE TGh together with ' activate and postpone (ActivationDelay) '.
In the IEEE TGk of IEEE 802.11 standards draft D 0.1 appendix [3]; All introduce for your guidance in this whole contents the draft appendix; Just look like at this it intactly have been set forth equally, the ability that is used for beginning to measure in the accurate time started is replaced by certain random interval after this.Measure though this ability can be used for some, yet in the measurement of other type, hope to have the ability that can begin to measure at certain precise time.For example, AP possibly want to have and keeps when station that this information asked with box lunch is just being measured or send communication service.
Current I EEE 802.11 mechanism allow the measurement of accurate timing or time started at random.Therefore, usefully be: have and in identical measurement request, to transmit to measuring the flexible mechanism of dissimilar explanations of time started.
Because channel condition in order to be sent to measurement request point of destination (STA), is made once above trial possibly.Receiving STA, if received the copy more than of same measurement request, STA abandons the repeated packets of nearest reception so.This meets the agreement of defined in the IEEE802.11 standard.
Abandon repeating frame according to IEEE 802.11 agreements and possibly cause asking and receive STA and all have different benchmark beacons receiving STA, they each all from the said benchmark beacon reference measure time started.For example; If estimate and will in a beacon period, send measurement request, and because channel condition, recipient STA is received frame correctly; And being sent out STA, its ACK do not receive; And if in another beacon period, successfully sent measurement request subsequently, and sending and receiving station so, the benchmark beacon is different.
Thereby, in order to overcome the ambiguity of measurement request in the time started in present mechanism, need the shared standard time as benchmark.
The present invention relates to a kind of being used for through revising measurement request so that comprise the absolute time started; And through optionally revising measurement request element so that in pattern field, comprise the explanation type that will be applied to the absolute time started; Come equipment and the method for specifying measurement time started neatly, the wherein said absolute time started optionally is timer synchronous function (TSF) timer value or its part.Being included in absolute time starteds (referring to Fig. 3) in the measurement request frame 300 refers to first time started of measuring of being carried out in response to measurement request frame 300 by STA.The absolute time started of measurement request element 400, (referring to Fig. 4 A) referred to the time started that is included in first measurement request 406 wherein.432 of absolute time starteds of measurement request 430 relate to the measurement of being asked.
In a preferred embodiment, the present invention is equipment and the method that is used for being come by the requesting party who sends measurement request frame the specifying measurement time started.Be used for usually explaining the indicated time started through comprising in the pattern field in measurement request element with respect to the unit that will measure, provide that (1) use that the indicated time started relates to lock in time benchmark or (2) explain at least one in the flexibility of indicated time started.
In another preferred embodiment; The present invention is intended to a kind of through in measurement request element, comprising measurement mode field and stipulate that in said pattern field some bits realize that 802.11 measure the Apparatus for () and method therefor of flexibilities, and the time started that said bit is used for being given for the indication of each measurement is: 1) with ask in the same; 2) be randomized; 3) be left in the basket; Still be 4) immediately.Whether the additional mode field bit indication actual measurement time started will be returned report.The indicated time started can stipulate according to time synchronized function (TSF) timer value or its part, measuring STA and receiving the ambiguity between the STA of the measurement report that comprises measurement so that eliminate.
Fig. 1 is the simplified block diagram that illustrates the architecture of the wireless communication system of using the embodiments of the invention application;
Fig. 2 A for example understands access point (AP) and each station (STA in specific Basic Service Set (BSS) according to the embodiment of the invention
i) simplified block diagram;
Fig. 2 B for example understands each station (STA in the Basic Service Set (IBSS) of specific independence or special type according to the embodiment of the invention
i) simplified block diagram;
Fig. 3 is according to the for example clear measurement request frame form (comprising the modification of measuring the time started field) of the embodiment of the invention, and it can be used between the station, sending the request that element-specific is measured.
Fig. 4 A accordings to the for example form (comprising the modification of measurement mode field) of clear measurement request element of the embodiment of the invention, and it can be used for stipulating the explanation to the time started of elements are contained.
The for example clear measurement request element format of Fig. 4 B comprises the modification of measurement mode field and measurement request element time started.
The for example clear measurement request mode field form of Fig. 4 C comprises the modification of the beginning field of the explanation type that is used for the specifying measurement claim frame time started, is used to be comprised in measurement request element wherein.
Among the for example clear Fig. 4 B of Fig. 4 D some probable value of beginning field of illustrational measurement request mode field; The type that its time started that can be used for stipulating being applied to measurement request element explains comprises said pattern field in said measurement request element.
Among the for example clear Fig. 4 A of Fig. 4 E some probable value of measurement type field of illustrational measurement request element, it can be used for the measurement type that regulation is asked.
The for example clear measurement request field format that is used for basic request of Fig. 4 F.
In being described below, as explaining rather than restriction, with setting forth such as details such as specific architecture, interface, technology so that thorough understanding of the present invention is provided.Yet it is obvious that concerning those those skilled in that art: can be in breaking away from other embodiment of these details embodiment of the present invention.
Fig. 2 A is typical Basic Service Set (BSS) wireless network of using the embodiment of the invention.
Shown in Fig. 2 A, access point (AP) 200 and a plurality of mobile radio station (STA
i) 201 couplings, said mobile radio station (STA
i) 201 communicate with one another and communicate by letter with AP via a plurality of wireless channels via Radio Link 202.Key principle of the present invention is to provide flexibility that a kind of increase explains the time started and/or is expressed as the time started and is used for by AP 200 and STA
iThe mechanism of the TSF timer value of 201 performed measurements.Fig. 2 B is typical independent basic service set (IBSS) wireless network of using the embodiment of the invention.Shown in Fig. 2 B, a plurality of mobile radio station (STA
i) 201 communicate with one another via Radio Link 202 having no under the situation of AP.Should be noted that for for the purpose of explaining, all very little at each network shown in Fig. 2 A-B.In practice, most of network may comprise much more mobile radio station STA that number is big
i201.
In IEEE 802.11h, measurement request comprises being used to indicate when to carry out the time reference measured of asking.For example, ' measuring skew ' stipulates the fiducial time among the IEEE TGh together with ' activate and postpone '.' activate postpone ' field is the number of the beacon markers (TBTT) that before beginning to measure, will wait for, and ' measuring skew ' field is from last time among these TBTT.Official hour possibly cause ambiguity in this manner as stated.
In IEEE TGk draft D 0.1, the ability that begins to measure in the accurate time started is replaced by certain random interval after this.Though this ability maybe be useful in some is measured, yet in the measurement of other type, also hope the ability that begins to measure at certain precise time.For example, AP possibly want to have and keeps when station that this information asked with box lunch is just being measured or send communication service.In addition as stated, because ACK loses, measurement request side breaks away from the ambiguity problem that is caused synchronously with the recipient and still exists.
Thereby art mechanisms or permission may be introduced about the ambiguous Measuring Time benchmark of Measuring Time between measurement side and the recipient who measures (it possibly be or also possibly not be the requesting party who measures), or allow the randomized time started.Therefore, need a kind of absolute time benchmark and wherein can in same measurement request, transmit the flexible mechanism of dissimilar explanation of time started in this area.
Equipment of the present invention and method are come scheduled start time through utilizing the absolute time benchmark, thereby a kind of any ambiguous mechanism of time started that is used for avoiding measuring is provided.According to equipment of the present invention and method, the problems referred to above are able to solve according to any one or a plurality of following manner: through in measurement request frame, in the measurement request element and comprise the absolute time benchmark in the measurement request.Through comprising in measurement request element that optionally pattern field provides flexibility in equipment of the present invention and method.Pattern field has stipulated how measurement side explains the measurement time started of each measurement element.In a preferred embodiment, use the coding of tribit to stipulate illustrational explanation among Fig. 4 D.
Fig. 1 is for example clear can be included in the interior AP of WLAN of Fig. 2 A-B and the architecture among each STA.AP 200 and STA
i201 can comprise receiver 101, demodulator 102, measurement acquisition cuicuit 103, memory 104, processor controls 105, TSF timer or its part 106, modulator 107 and transmitter 108.The example system 100 of Fig. 1 only is used for descriptive purpose.Although this description possibly relate to the term of public use in describing specific mobile radio station, yet this description and principle are equally applicable to other treatment system, comprise the system that has with in different architecture shown in Fig. 1.
In the operation; Receiver 101 is coupled so that convert the data of wanting of signal that is received and transmission into the corresponding digital data via demodulator 102 and modulator 107 with transmitter 108 and antenna (not shown), or returns the signal of said reception and the data of wanting from the corresponding digital data transaction.Measuring acquisition cuicuit 103 operates under the control of processor controls 105 so that construct measurement request frame 300; Said measurement request frame 300 comprises to be measured the time started 304; The said measurement time started 304 is set to equal the value of a TSF timer or its part 106, will carry out first of measurement request frame at this moment and measure.At least one measurement request element 305 by being included in the measurement request frame 300 is indicated the measurement (one or more) of being asked.
In alternative embodiment, the form of revising measurement request element 400 is so that make it comprise measurement mode field 404, shown in Fig. 4 A.In Fig. 4 C illustrated the form of measurement request mode field 410, wherein as among Fig. 4 D the institute illustrational, defined beginning field 407.
In a preferred embodiment, another STA by request BSS or IBSS goes the STA or the AP that measure one or more channels to send measurement request frame 300.The preferred embodiment of the form of the measurement request frame body 300 with following field setting has been shown in Fig. 3:
Measuring time started field 304 and be set to the time, is the TSF timer value in candidate's preferred embodiment, will begin the measurement by the first measurement request element defined at this moment.Equal zero if the measurement time started is set, will after receiving measurement request frame 300, begin measurement so by the first measurement request element defined.The existence of measuring time started field 304 is selectable.
Measurement request element field 305 comprises at least one measurement request element.In first alternative embodiment, measurement request element has illustrational format 4 00 among Fig. 4 A.In second alternative embodiment, measurement request element has illustrational format 4 40 among Fig. 4 B.In 802.11 embodiment of the present invention, limit the number and the length of measurement request element in the measurement request frame 300 by the size of medium access control (MAC) the management protocol data unit MMPDU that maximum allowed.The son field of the element of revising is:
1. element ID son field 401 is set to equal unique identifier;
2. length son field 402 is variable and the length that depends on the measurement request field.The minimum value of this length field is 3.
3. measuring token son field 403 and be set to non-zero number, is unique among the measurement request element of said non-zero number in the particular measurement claim frame.
4. selectable measurement pattern son field 404 is in Fig. 4 C illustrated and comprise beginning son field 407 in a preferred embodiment; Be used to stipulate to be applied to shown in Fig. 4 D, measure the explanation of the time started 304 or 408 or 432 (any one time started has the priority of given measurement) of element
5. measure element time started field 408 and be set to the time (in candidate's preferred embodiment, being the TSF timer value), will begin measurement at this moment by measurement request element 400 defineds.Be set to equal zero if measure the time started 408, will after receiving measurement request frame 300, begin measurement so by the first measurement request element defined.The existence of measuring element time started field 408 is selectable, and if its be present in to cover so in the frame 300 and measure frame zero-time 304.
6. measure type son field 405 and be set to the measurement type of being asked, and can comprise one of several kinds of request types 420 and
7. measurement request son field 406 is set to additional parameter is provided so that the measurement type of carrying out being asked, and for example, when the measurement request type was basic request type, measurement request had illustrational format 4 30 among Fig. 4 F, comprised following field:
Channel number fields 431 is set to equal the applied channel number of said measurement request,
Selectable measurement time started field 432; Be set to equal absolute timer value (for example in (± 32:s) time TSF timer); To begin the measurement request of being asked this moment, and if be worth 0 indication and do not have measurement pattern son field 404 to begin so immediately to measure, if also represent to exist measurement pattern son field 404; So just according to respect to the indicated bit that begins to measure of the mode subfield of measuring time started field 432 404 and
Measurement duration field 433 is set to equal the duration of the measurement of asking, and representes with TU.
In candidate's preferred embodiment,, be defined in the field less than 8 bytes measuring skew (being time started field 304 408 432) through only using the minimum effective bit number of being wanted of the absolute timer value of 8 bytes (for example TSF timer value).For example, can also be defined in it in the field of 4 bytes through four most significant bytes clipping the TSF timer value.
In addition, if do not need the highest resolution of 1 microsecond, can not use some minimum effective bit of TSF timer value so.For example, if use bit 36-5, so attainable minimum resolution is the complexity that 32:s and regulation in this way can reduce enforcement.
Though illustrated and described the preferred embodiments of the present invention, it will be understood by those skilled in the art that and to carry out various changes and modification, and under the situation that does not break away from true scope of the present invention, can replace its element with equivalent.For example, the absolute time benchmark be provided in the measurement request frame skin or according to the internal layer of the single basic request of the measurement request element of any combination of measurement pattern in.In addition, can carry out many modifications so that be suitable for specific situation, such as the format change of frame and element, and according to making amendment to instruction of the present invention with the mode of the not situation equivalence of off center scope.Therefore the object of the invention and not lying in will be limited in as carrying out the desired disclosed specific embodiment of best mode of the present invention, but the present invention includes all embodiment that fall into accompanying claims.
List of documents
IEEE 802.11 WG document number ISO/IEC 8802-11:1999 (E) ieee standards 802.11,1999 editions.International Standard [for] InformationTechnology-Telecommunications and Information Exchange AreaNetworks (international standard of information technology-between local area network (LAN)/metropolitan area network system radio communication and information exchange), real needs-part 11: WLAN medium access control (MAC) and physical layer (PHY) standard.USA New York: IEEE company, 1999.
IEEE 802.11 WG ieee standard 802.11h/D3, in May, 2003 version.The radio communication and the information exchange of the draft appendix of the ieee standard of information technology-between local area network (LAN)/metropolitan area network system, real needs-part 11: wireless medium access control (MAC) and physical layer (PHY) standard: expand in European 5GHz bandwidth intermediate frequency spectrum and transmit power management.
IEEE 802.11 WG ieee standard 802.11k/D0.4, in July, 2003.The radio communication and the information exchange of the draft appendix of the ieee standard of information technology-between local area network (LAN)/metropolitan area network system, real needs-part 11: wireless medium access control (MAC) and physical layer (PHY) standard: the standard of radio resource measurement.
Claims (13)
1. method that is used in network measure claim frame (300) the specifying measurement time started comprises step:
Format measurement request frame (300) is so that make it have measurement request element field (305); This measurement request element field (305) comprises at least one measurement request element (400; 440), said at least one measurement request element (400,440) comprises at least one measurement request (406 of the network measure of given type (405); 410)
In corresponding at least one measurement request frame, measurement request element (440) and at least one measurement request (406), at least one in the absolute time started according to priority of separate provision first (304), second the (408) and the 3rd (432),
Wherein said first (304), second the (408) and the 3rd (432) the absolute time started was suitable for the absolute time started according to the priority order indication that increases respectively; To start the measurement of the measurement request element (305) that at first comprises in this first (304) absolute time started; Corresponding measurement request element (440) to be started in this second (408) absolute time started, and corresponding measurement request (432) will be started in the 3rd (432) absolute time started.
2. the method for claim 1, also comprise step: said first (304), second the (408) and the 3rd (432) the absolute time started was set to one of part of time synchronized function (TSF) timer (106) value and TSF timer (106) value.
3. like any one described method in the claim 1 to 2, also comprise step: first (304), at least one in the second (408) and the 3rd (432) absolute time started is set to zero so that indication will receive that measurement request frame (300) starts corresponding the measurement afterwards.
4. the method for claim 1 also comprises step:
In at least one measurement request element (400,440), comprise measurement pattern son field (404); And
Said measurement pattern son field (404) be set to be used for regulation how to explain suitable in first (304), second the (408) and the 3rd (432) the absolute time started one so that the value of start element measurement.
5. method as claimed in claim 4, the wherein said step that is used for being provided with measurement pattern son field (404) is to be set to the beginning son field (407) of measurement pattern (404) son field from the step of the following group of indicating device of selecting (407), said group comprises:
Require to measure in the indicated time started,
Certain random interval that requires to measure after the indicated time started begins,
Measurement can begin at any time,
Require measurement after receiving request, to begin immediately,
Should toward the reported actual measurement time started and
Should be toward the reported actual measurement time started.
6. method as claimed in claim 5, the wherein said step that is provided with comprises that also the coding (407) that uses three bits representes the step of selected indicating device.
7. method as claimed in claim 6, wherein said use step comprise that also the coding (407) that uses following three bits representes the step of selected indicating device:
X00: require to measure in the indicated time started,
X01: certain random interval that requires to measure after the indicated time started begins,
X10: measurement can begin at any time,
X11: require measurement after receiving request, to begin immediately,
1xx: should toward the reported actual measurement time started and
0xx: should be toward the reported actual measurement time started.
8. a format has the equipment of measurement request frame of the measurement time started of unambiguity, comprising:
Measure acquisition cuicuit (103); Be used to format measurement request frame (300) so that make it have measurement request element field (305); This measurement request element field (305) comprises at least one measurement request element (400; 440), said at least one measurement request element (400,440) comprises at least one measurement request (406) of the network measure of given type (405);
TSF timer (106); With
Processor controls (105); With said measurement acquisition cuicuit (103) and said TSF timer (106) coupling; And be configured in corresponding measurement request frame (300); Be provided with first (304) respectively in measurement request element (305) and at least one measurement request (406); In the second (408) and the 3rd (432) absolute time started at least one; Said first (304); The second (408) and the 3rd (432) absolute time started was set to be used for to indicate the value of the TSF timer (106) that order of priority increases
Wherein said first (304), second the (408) and the 3rd (432) the absolute time started was suitable for the absolute time started according to the priority order indication that increases respectively; To start the measurement of the measurement request element (305) that at first comprises in this first (304) absolute time started; Corresponding measurement request element (440) to be started in this second (408) absolute time started, and corresponding measurement request (432) will be started in the 3rd (432) absolute time started.
9. equipment as claimed in claim 8, the value of wherein said TSF timer (106) are the parts of TSF timer (106) value.
10. equipment as claimed in claim 9, wherein:
Said measurement request frame (300) is formatted into and comprises fields:
Classification field (301) is set to be used for indicating the value of Radio Measurement or spectrum management classification,
Action field (302) is set to be used for indicating the value of measurement request,
Session token field (303) is set to equal to be selected to be used for by the transmitter of measurement request frame the nonzero value of identification request/reporting transactions,
Measure time started field (304); Be set to TSF timer (106) value; Will start the measurement by the first measurement request element defined this moment; And if said measurement time started field (304) is set to equal zero, receive that measurement request frame (300) begins the measurement of the first measurement request element defined afterwards
Measurement request element field (305) has at least one measurement request element,
And the measurement request element field is formatted into and comprises following son field:
Element ID son field (401) is set to unique identifier,
Length son field (402), it is variable and depends on the length of measurement request son field, and the minimum value of this length son field is 3,
Measuring token son field (403), be set to non-zero number, is unique among its measurement request element (305) in particular measurement claim frame (300),
Measurement pattern son field (404) is set to comprise beginning (407) mode subfield, is used to stipulate to be applied to the explanation of the measurement frame time started of measured element,
Measurement request son field (406) is set to be used to accomplish at least one parameter of the type of measuring type, and is formatted into and comprises following son field:
Channel number son field (431) is set to the channel number that is applied to measurement request,
Measure time started son field (432), be set to begin the time of measurement request,
Measure duration son field (433), be set to accomplish the measurement elapsed time of wanting.
11. equipment as claimed in claim 10, wherein processor controls (105) the beginning mode subfield (407) that also is configured to a measurement pattern son field (404) is set to the value from following group, selected, and said group comprises:
Require to measure in the indicated time started,
Certain random interval that requires to measure after the indicated time started begins,
Measurement can begin at any time,
Require measurement after receiving request, to begin immediately,
Should toward the reported actual measurement time started and
Should be toward the reported actual measurement time started.
12. equipment as claimed in claim 11, the value of wherein said selection is encoded with the coding (407) of three bits.
13. equipment as claimed in claim 12, the coding of wherein said three bits (407) is:
X00: require to measure in the indicated time started,
X01: certain random interval that requires to measure after the indicated time started begins,
X10: measurement can begin at any time,
X11: require measurement after receiving request, to begin immediately,
1xx: should toward the reported actual measurement time started and
0xx: should be toward the reported actual measurement time started.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US46919503P | 2003-05-09 | 2003-05-09 | |
| US60/469,195 | 2003-05-09 | ||
| US50385103P | 2003-09-17 | 2003-09-17 | |
| US60/503,851 | 2003-09-17 | ||
| PCT/IB2004/001509 WO2004100451A1 (en) | 2003-05-09 | 2004-05-03 | System and method for specifying measurement request start time |
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| Publication Number | Publication Date |
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| CN1784866A CN1784866A (en) | 2006-06-07 |
| CN1784866B true CN1784866B (en) | 2012-11-14 |
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| CN200480012526.6A Active CN1784866B (en) | 2003-05-09 | 2004-05-03 | System and method for specifying measurement request start time |
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|---|---|
| CN (1) | CN1784866B (en) |
| UA (1) | UA90845C2 (en) |
| ZA (1) | ZA200509032B (en) |
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Non-Patent Citations (4)
| Title |
|---|
| Daryl Kaiser等.Proposed Text for Radio Measurement Requests and Reports.http://grouper.ieee.org/groups/802/11/Documents/D3T151-200.html.2003,4-5,6-7,13-14. * |
| Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements-Part11:Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications 1999 Edition.The Institute of Electrical and Electronics Engineers, Inc.,1999,34-58, 123-128. |
| Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements-Part11:Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications 1999 Edition.The Institute of Electrical and Electronics Engineers, Inc.,1999,34-58, 123-128. * |
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| CN1784866A (en) | 2006-06-07 |
| UA90845C2 (en) | 2010-06-10 |
| ZA200509032B (en) | 2007-02-28 |
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