CN100539528C - In wireless network, determine the method and system of available channel - Google Patents
In wireless network, determine the method and system of available channel Download PDFInfo
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- CN100539528C CN100539528C CNB200580023260XA CN200580023260A CN100539528C CN 100539528 C CN100539528 C CN 100539528C CN B200580023260X A CNB200580023260X A CN B200580023260XA CN 200580023260 A CN200580023260 A CN 200580023260A CN 100539528 C CN100539528 C CN 100539528C
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Abstract
In order to reduce the average latency, can be by being used for determining to obtain the information that exists about radar, the i.e. information of the channel utilizability part in the equipment of the available channel of wireless network and method.This comprises by following steps determines available channel in wireless network: be received in regulatory domain information in the wireless network; Generation comprises the report corresponding at least one part of described regulatory domain information; Send described report; Receive described report at the STA place; And determine according to the part that is comprised in the report whether channel can be used for transmission at least in part corresponding to described regulatory domain information.
Description
Present patent application requires the temporary patent application No.60/586 of submission on July 9th, 2004,945 rights and interests, and being taught in of this patent application is hereby incorporated by reference.
IEEE 802.11 standard codes are used for the medium access control (MAC) of wireless lan (wlan) and physical features to support physical layer element.IEEE 802.11 standards are at international standard ISO/IEC 8802-11, " be used for the concrete requirement of ieee standard (telecommunications between system-local area network (LAN) and metropolitan area network and information exchange) of information technology; part 11: WLAN medium access control (MAC) and physical layer (PHY) technical specification ", stipulate in 1999 editions [1] that this standard integrally is being hereby incorporated by reference.The following additional part for 802.11 also is being hereby incorporated by reference: IEEE 802.11h, IEEE TGk draft (IEEE TGk draft) D0.14 and IEEE TGe draft (IEEE TGe draft) D8.0.
In some management domain, do not allow station (STA) to determine in interested frequency band, not exist radar signal or it to be apprised of at it: before access point (AP) does not detect interested radar, transmit frame in some frequency band.If AP finds radar, then it is to the station report, and the network on this channel will be turn-offed in this station then, and move to one other channel.This moves the 802.11 scan channel programs of following and carries out.
The IEEE TGk that quote the front provides roaming capacity for WLAN.This standard provides the channel of fixed number for radar scanning, and promptly system will be at the scope interscan channel of certain permission.For help system scanning, wireless station receives such as the site report or the neighbours that collect from AP and reports such report, this report explanation, and which channel is spendable in the neighbours at station.This is reduced to determines the needed scanning amount of spendable channel, and makes the hysteresis in transmission time minimize.
Stand and itself can not have the ability that detects radar.In such management domain, stand and carry out passive scanning, to wait for beacon from access point.Beacon package contains the relevant information that whether has radar in channel.Beacon is sent out with the Fixed Time Interval of rule, usually for the reason of the usefulness of networking they at interval quite far away.This has shortcoming: during standing in roaming during switching channels, it can not send comprise the beacon of radar information in scanning radar or uppick before.This for radar scanning and/or to be arranged when causing these stations to carry out passive scannings the long average latency for intercepting of beacon, up to beacon period of each scanning channel.
Therefore, in order to reduce the average latency, must obtain the information that relevant radar exists, the i.e. part of channel workability by the measure of replacing.
The present invention relates to be used for to determine equipment and method at the spendable channel of wireless network.In one aspect, a kind ofly be used for determining may further comprise the steps: be received in the regulatory domain information in the wireless network at the AP place in the method for the spendable channel of wireless network; Generate the report that comprises corresponding at least a portion of regulatory domain information at the AP place; Be independent of conventional beacon transmissions and send this report at the AP place; Receive this report at the STA place; And determine according to being included in part in the report whether channel can be used for transmitting at least in part corresponding to described regulatory domain information at the STA place.
In one embodiment, the step that receives at the AP place comprises other regulatory domain information of receiving system level.
In another embodiment, the step that receives at the AP place comprises with wireless mode, or by wired system, or use the two receiving system regulatory domain information simultaneously.
In another embodiment, forwarding step comprises that using the time interval shorter than the time interval between the later beacon transmissions to send reports.
In another embodiment, forwarding step comprises when being asked by STA from AP transmission report.
In another embodiment, forwarding step comprises transmission report on one's own initiative.
In another embodiment, this method comprises according to this determining step and sending on channel.
In another embodiment, report comprises the information of a series of candidate AP that a relevant STA can roam.
In another embodiment, report comprises the information of a series of candidate AP that relevant STA will preferably roam.
In another embodiment, generating step comprises and generates a report that comprises at least one part that exists corresponding at least one part of regulatory domain information with corresponding to radar;
In another embodiment, determining step comprises at least in part according to being comprised in and determines corresponding to the part of regulatory domain information with corresponding to the part that radar exists whether channel can be used for transmitting in this report.
On the other hand, be used for determining that the method for the available channel of wireless network may further comprise the steps: the regulatory domain information in the AP place receives wireless network; Generate a report that comprises at least one part that exists corresponding at least one part of regulatory domain information with corresponding to radar at the AP place; Be independent of beacon transmissions and send this report at the AP place; Receive this report at the STA place; And determine corresponding to the part of regulatory domain information with corresponding to the part that radar exists whether channel can be used for transmitting according to being comprised in the report at least in part at the STA place.
On the other hand, be used for determining that the method for the available channel of wireless network may further comprise the steps: be collected in the regulatory domain information at least one channel at the AP place; Generate the protocol frame format that has corresponding at least one part of regulatory domain information at the AP place; Be independent of conventional beacon and send this protocol frame format at the AP place; And determine according to being comprised in part in the protocol frame format whether channel can be used for transmitting at least in part corresponding to described regulatory domain information at the STA place.
In one embodiment, collect step and comprise the regulatory domain information of collecting relevant at least one channel of measurement, from local data base searching, managing information, or a management rule is applied on the result of Radio Measurement.
In another embodiment, collecting step takes place by wired network or by wireless network.
In another embodiment, forwarding step comprises that AP is according to the request of STA or send protocol frame format on one's own initiative.
On the other hand, be used for determining comprising: a series of AP and STA in the system of the available channel of wireless network.Each AP comprises: memory includes regulatory domain information; Dispensing device is used for sending regulatory domain information in wireless network; Receiver is used for receiving management domain information in this wireless network; Report Builder, it generates a report that comprises corresponding at least one part of regulatory domain information; Transmitter is used to be independent of beacon transmissions and sends this report.STA comprises: receiver is used to receive this report; And processor, be used for determining according to the part that is comprised in report whether channel can be used for transmission at least in part corresponding to regulatory domain information.The candidate that described a series of AP can roam as STA.
On the other hand, be used for determining comprising: AP and STA in the system of the available channel of wireless network.AP comprises: memory includes regulatory domain information; Dispensing device is used for sending regulatory domain information in wireless network; Receiver is used for receiving management domain information in this wireless network; Detector is used to detect the existence of radar; Report Builder, its generates the report comprise at least one part that exists corresponding at least one part of regulatory domain information with corresponding to radar; Transmitter is used to be independent of beacon transmissions and sends this report.STA comprises: receiver is used to receive this report; And processor, be used at least in part determining corresponding to the part of described regulatory domain information with corresponding to the part that radar exists whether channel can be used for transmitting according to what be comprised in report.
The invention provides many advantages, some advantage is set forth with reference to embodiment below.
Fig. 1 shows WLAN;
Fig. 2 shows the simplified block diagram according to each station (STA) in the access point (AP) of embodiments of the invention and the sub-district;
Fig. 3 shows website report unit;
Fig. 4 shows BSSID matching status district;
Fig. 5 shows signal/map section;
Fig. 6 is presented at the process chart of AP place for the low latency scanning of use and management information frame; And
Fig. 7 is presented at the process chart of STA place for the low latency scanning of use and management information frame.
Fig. 1 shows an example of WLAN (WLAN) 20 systems that are used to implement the inventive method.WLAN 20 has been stipulated an infrastructure network that comprises a plurality of sub-districts 22.Sub-district 22 comprises access point (AP) 24 (it is called as wireless local bridge circuit or base station sometimes).
Continuation is with reference to Fig. 1, and sub-district 22 can comprise far-end network station (STA) 26.Access point 24 and far-end STA 26 can be the transmitter and the receivers of system.Each STA 26 can be move, portable or quiescent terminal.Each STA 26 can be desk-top workstation, notebook computer, palmtop PC, handheld personal computer, the computer based on pen, personal digital assistant, hand held scanner, data collector, hand held printer or the like.
If exist, AP 24 is used for can being configured to be provided between sub-district STA 26 and the AP 24 and the communication gate between wired network and STA 26 at the interface that communicates between wireless network 20 and the wired network, AP 24.AP 24 typically is configured to figure signal between wired and wireless communication media.Conversion can allow access point to transmit the communication information between wired network and wireless STA26.Wired network can be coupled to external network (for example, PBX, PSTN, internet or the like).
Referring now to Fig. 2, AP 24 and STA 26 can comprise display 30, CPU 32, emittor/receiver 34, input unit 36, reservoir module 38, random access storage device (RAM) 40, read-only memory 42 and common bus 41.Though illustrate to relate to the common term that uses in described concrete computer system, explanation and notion may be used on other treatment system equally, comprise having the system that is different from the sort of structure shown in Figure 2.Emittor/receiver 34 is coupled to the antenna (not shown), sends the data of wanting, and its receiver becomes the corresponding digital data to the signal transformation that receives.Move under the control of the operating system of CPU 32 in being comprised in ROM 42, and utilizing RAM 40 to carry out frequency in wireless lan (wlan) selects, by being enabled in AP in the infrastructure network or the STA in AD-HOC network, for all the other websites (STA) provide new channel or Radio Link.
In when operation, based on 802.11 wireless lan (wlan), in the WLAN 20 such as Fig. 1, a plurality of STA 26 can interrelate with AP 24, if present typically.Each STA 26 can have different communication capacities and requirement.AP 24 can manage the communication service between STA 26 and wireless network.When AP 24 can send to each far-end STA 26 in the sub-district 22 to these frames and the supervisory communications business by control.Communication service in the sub-district 22 (for example can comprise Frame, carry the signal of the frame that data communication is provided), Speech frame (for example, carry the signal of the frame that Speech Communication is provided), in real time frame is (for example, the signal that provides such as the frame of the real time communication of multimedia or Speech Communication is provided), management frames (for example, carrying the signal of the frame that network management communication is provided) or the like.
AP 24 can broadcast or send report, such as the site report in the site report protocol frame or neighbours' report.Regulatory domain information can be included in the report neutralization and be propagated by report.Fig. 3 shows a site report unit, and it comprises the relevant information of a series of AP of the candidate that can roam about STA.This information comprises ID district 300, unit and length field 301.Length field 301 is variable, and it is set to the four hyte 302-311 numbers (that is being 10) that the size by the quadruplication hyte obtains in Fig. 3.Each four hyte is described AP 24, and comprises basic service sets ID (BSSID) 302, BSSID matching status 303, current channel 304 and PHY type 306.The minimum value of length field is 0.This does not occur when not having neighbor AP in the site report unit.Site report unit transmission can be by the STA request or initiatively.It also can appear between the beacon frame.
BSSID 302 is the addresses that are comprised in the STA 26 among the AP 24.Later district comprises BSSID matching status 303, current channel 304 and PHY type 306, all supposes to be used for corresponding BSSID.
BSSID matching status 303 for example is two eight hyte districts that comprise information shown in Figure 4.Fig. 4 shows BSSID matching status district 303.BSSID matching status 303 for example is two eight hyte districts that comprise ESS bit 401, capability bit 402 and supported rates bit 403.ESS bit 401, if be set up, expression is by the AP announcement SSID identical with current AP of BSSID 302 expressions.If this bit is not set up, its expression or SSID do not match, and perhaps AP does not have this information in the current time.Capability bit 402, if be set up, the ability of representing current AP is complementary with ability by the AP of BSSID 302 representatives.If capability bit 402 is not set up, then its expression or ability do not match, and perhaps at this moment information is unavailable for AP.Supported rates bit 403, if be set up, the supporting rate of speed that the AP announcement that expression is represented by BSSID302 is supported and current AP is complementary.If supported rates bit 403 is not set up, then its expression or supporting rate do not match, and perhaps at this moment information is unavailable for AP.
Get back to the site report of Fig. 3, the channel of the current operation of current channel 304 regulation AP 24.
The PHY type of the AP 24 that PHY type 306 expression is represented by BSSID.If BSSID has more than one PHY type, the BSSID item of repetition will be arranged in site report then.
The length in maximum transit power level district 307 for example is one eight hyte.It is illustrated in the maximum power that allows transmission in this system, for example in dBm.
Partial power's confining region 308 is set to a value, and the requirement that this value allows to alleviate in current channel is met.It is encoded as the integer that does not for example add sign, is unit with dB.Local maximum transmit power to channel for example is defined as deducting partial power's constraint of stipulating into the channel in the power constraint unit (for MIB) for the maximum transit power level of the regulation of the channel in national unit (not shown).
Signal/map section 309 is encoded as bit area.Fig. 5 shows signal/map section 309, it comprises BSS bit 501, OFDM preamble bit 502, Unidentified signal bit 503, radar bit 504 and unmeasured bit 505.
When during measuring period when another BSS or IBSS have received at least one efficient MAC protocol data cell (MPDU) channel, BSS bit 501 can be set to equal 1.Otherwise this bit is set to equal 0.
When detecting the useful signal district that neither one is followed as saving at least one sequence of the Short Training code element of stipulating among the 17.3.3 at IEEE 80,211 1999 Reaf2003 during measuring period in channel, OFDM preamble bit 502 can be set to equal 1.This can represent the existence such as the OFDM preamble of HIPERLAN/2.Otherwise this OFDM preamble bit is set to equal 0.
When receiving the obvious power that can not be characterized as being radar, OFDM preamble or effective MPDU during measuring period in channel, Unidentified signal bit 503 can be set to equal 1.Otherwise this Unidentified signal bit is set to equal 0.Significantly embodiment is depended in the definition of power.
When detecting the radar of working by system in channel during measuring period, radar bit 504 can be set to equal 1.The algorithm that detects radar satisfies the requirement of managing in given zone, and is beyond the scope of TGk standard.If when not detecting radar during measuring period, this radar bit is set to equal 0.
When not measuring this channel, unmeasured bit 505 can be set to equal 1.Otherwise it is set to equal 0.When unmeasured bit 505 was set to equal 1, other all in signal/map section 309 districts were set to equal 0.
The subclass of the subclass in the subclass of information unit or district or the bit in the district or their combination can be used in the protocol frame of suggestion.In addition, the length in district just provides as an example.Section length can be that fix or variable, or byte count is carried out change to adapt to the different scope of known technically information.
Fig. 6 is presented at the process flowchart of AP place for the low latency scanning of use and management information frame.In this illustrative example, in step 62, AP collects the management information of the channel that the channel of working about it and relevant other AP worked.AP can be by measuring for channel, by from local data base searching, managing information, or applies the management rule by the result to Radio Measurement and collect this information.AP can also obtain management information by wired network or by wireless network.AP generates protocol frame format in step 63 with management information then.AP is independent of conventional beacon and sends protocol frame format in step 64 then.AP can send this frame in STA request back or it can send at least one STA on one's own initiative.
Fig. 7 is presented at the process chart of the low latency scanning of STA place use and management information frame.In this illustrative example, in step 72, STA asks some management information of relevant at least one AP in same or other channel.This step is chosen wantonly, and STA can not carry out this step.When AP sends management information, as what set forth in the paragraph in front, STA receives this information in step 73, and will interrelate with which AP, get in touch, roam into this AP again or stay current AP with it according to the information decision that receives at least in part in step 74.If STA decision roams into it and receive that AP from the information of this AP in report, its getting in touch or associated process again then at step 75 beginning and this AP.
The present invention describes with reference to specific description embodiment.Should see that the present invention is not limited to the modification of the above embodiments and it, and those skilled in the art can make various changes and modification and not deviate from the spirit and scope of claims.
When the decipher claims, should see:
A) individual character " comprise " do not get rid of except in given claim, list those other unit or the existence of step;
B) do not get rid of the existence of a plurality of such unit at the individual character " " of front, unit;
C) any label does not in the claims limit their scope;
D) several " devices " can be by the structure or the function representative of same project or hardware or software implementation;
E) any disclosed unit can comprise hardware components (for example, comprise discrete with integrated electronic circuit), software section (for example, computer programming) and their any combination:
F) hardware components can be made up of simulation and numerical portion one or both of;
G) other part can be combined or be separated into to any disclosed device or their part, unless set forth especially in addition; And
H) need not plan the step of particular sequence, unless represent especially.
Claims (20)
1. one kind is used for determining the method at the available channel of wireless network, comprising:
Locate to receive regulatory domain information in the wireless network at AP (24);
Locate to generate the report that comprises corresponding at least one part of described regulatory domain information at AP (24);
Locate to be independent of beacon transmissions and send described report at AP (24);
Locate to receive described report at STA (26); And
Locate to determine according to the described part that is comprised in the described report whether channel can be used for sending at least in part at STA (26) corresponding to described regulatory domain information.
2. method as claimed in claim 1, wherein the step of locating to receive at AP (24) also comprises the regulatory domain information that is received on the system level.
3. method as claimed in claim 1, wherein the step of locating to receive at AP (24) also comprises and uses wireless mode, or by wired system, or come the receiving management domain information with the two simultaneously.
4. method as claimed in claim 1, wherein forwarding step also comprises with the time interval transmission report shorter than the time interval between the later beacon transmissions.
5. method as claimed in claim 1, wherein forwarding step also comprises when being asked by STA (26) from AP transmission report.
6. method as claimed in claim 1, wherein forwarding step also comprises transmission report on one's own initiative.
7. method as claimed in claim 1 also comprises according to this determining step sending on channel.
8. method as claimed in claim 1, wherein report also comprises the information of a series of candidate AP (24) that relevant STA (26) can roam.
9. method as claimed in claim 1, wherein report also comprises the information of a series of candidate AP (24) that relevant STA (26) will preferably roam.
10. method as claimed in claim 1 wherein generates step and also comprises and generate a report, and it comprises corresponding at least one part of described regulatory domain information and at least one part of existing corresponding to the radar of working in the channel.
11. as the method for claim 10, wherein determining step also comprises at least in part according to being comprised in and determines corresponding to the described part of described regulatory domain information with corresponding to the described part that the radar of working in the channel exists whether channel can be used for transmitting in the described report.
12. a method that is used for determining at wireless network available channel may further comprise the steps:
Locate to receive regulatory domain information in the wireless network at AP (24);
Locating to generate one at AP (24) comprises corresponding at least one part of described regulatory domain information and the report of at least one part that the radar of working in corresponding to channel exists;
Locate to be independent of beacon transmissions and send described report at AP (24);
Locate to receive report at STA (26); And
STA (26) locate at least in part according to be comprised in the described report corresponding to the described part of described regulatory domain information and the described part that exists of the radar of working in corresponding to channel determine whether channel can be used for transmitting.
13. a method that is used for determining at wireless network available channel may further comprise the steps:
Locate to collect regulatory domain information at least one channel at AP (24);
Locate to generate the protocol frame format that has corresponding at least one part of described regulatory domain information at AP (24);
Locate to be independent of conventional beacon and send described protocol frame format at AP (24); And
Locate to determine according to the described part that is comprised in the described protocol frame format whether channel can be used for transmission at least in part at STA (26) corresponding to described regulatory domain information.
14. method as claim 13, wherein collect step and also comprise the regulatory domain information of collecting relevant at least one channel of measurement, from local data base searching, managing domain information, or the management rule is applied to collect on the result of Radio Measurement this regulatory domain information.
15., wherein collect step and realize by wired network or by wireless network as the method for claim 13.
16. as the method for claim 13, wherein forwarding step comprises that also AP (24) according to the request of being done by STA (26) or on one's own initiative, sends protocol frame format.
17. as the method for claim 13, wherein protocol frame format also comprises the information of a series of candidate AP (24) that relevant STA (26) can roam.
18. as the method for claim 13, wherein protocol frame format also comprises the information of a series of candidate AP (24) that relevant STA (26) will preferably roam.
19. a system that is used for determining at wireless network available channel comprises:
STA and a series of AP (24), wherein each AP (24) comprising:
Memory includes regulatory domain information;
Dispensing device is used for sending regulatory domain information in wireless network;
Receiver is used for receiving management domain information in this wireless network;
Report Builder, it generates the report that comprises corresponding at least one part of described regulatory domain information; With
Transmitter is used to be independent of beacon transmissions and sends described report;
Wherein this STA (26) comprising:
Receiver is used to receive described report; And
Processor (32) is used for determining according to the described part corresponding to described regulatory domain information that is comprised in described report whether channel is available for transmission at least in part,
The candidate that described a series of AP (24) can roam as STA (26).
20. a system that is used for determining at wireless network available channel comprises:
AP (24) and STA (26), wherein this AP (24) comprising:
Memory comprises regulatory domain information;
Dispensing device is used for sending regulatory domain information in wireless network;
Receiver is used for receiving management domain information in this wireless network;
Detector is used for detecting the existence of the radar that channel works;
Report Builder, its generates a report that comprises at least one part that exists corresponding at least one part of regulatory domain information with corresponding to radar; With
Transmitter is used to be independent of beacon transmissions and sends described report;
Wherein this STA (26) comprising:
Receiver is used to receive described report; And
Processor (32) is used at least in part determining corresponding to the described part of described regulatory domain information with corresponding to the described part that the radar of working in the channel exists whether channel can be used for transmitting according to what be comprised in described report.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58694504P | 2004-07-09 | 2004-07-09 | |
| US60/586,945 | 2004-07-09 | ||
| US60/635,685 | 2004-12-13 |
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| Publication Number | Publication Date |
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| CN1985476A CN1985476A (en) | 2007-06-20 |
| CN100539528C true CN100539528C (en) | 2009-09-09 |
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| CNB200580023260XA Expired - Fee Related CN100539528C (en) | 2004-07-09 | 2005-07-07 | In wireless network, determine the method and system of available channel |
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| CN111913159A (en) * | 2019-05-10 | 2020-11-10 | 华为技术有限公司 | Radar test method and device |
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| CN1985476A (en) | 2007-06-20 |
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