CN101577649A - Method and system for transmitting data in wlan - Google Patents
Method and system for transmitting data in wlan Download PDFInfo
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- CN101577649A CN101577649A CNA2007101609464A CN200710160946A CN101577649A CN 101577649 A CN101577649 A CN 101577649A CN A2007101609464 A CNA2007101609464 A CN A2007101609464A CN 200710160946 A CN200710160946 A CN 200710160946A CN 101577649 A CN101577649 A CN 101577649A
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Abstract
Aspects of a method and system for coexistence between 20 MHz and 40 MHz OBSSes in WLANs. Aspects of a system may include a receiving device, such as a WLAN station (STA), which enables reception of an information frame, such as a management frame, via a wireless communication medium. The receiving device may be associated with a wireless network device group, such as a basic service set (BSS). The information frame received by the receiving device may transmitted by a transmitting device, such as a transmitting access point (AP), which is associated with a foreign wireless network device group, for example a foreign BSS. The receiving device may be reconfigured to restrict RF channel bandwidth utilized for transmitting and/or receiving signals via the wireless communication medium based on the received information frame.
Description
Technical field
The present invention relates to communication network, more particularly, relate to the method and system of coexistence between interior 20MHz of a kind of WLAN (wireless local area network) and the overlapping basic service sets of 40MHz (OBBS).
Background technology
IEEE 802.11 has described a kind of communication construction, and it can realize that computing equipment passes through WLAN (wireless local area network) (WLANs) and communicates.The structure module of WLAN is basic service sets (BBS).A BBS includes a plurality of computing equipments or terminal (STA), and it can carry out radio communication by one or more radio frequencies (RF) channel in the overlay area.The scope of overlay area can determine that the data of this emission are received by destination STA by the distance of RF channels transmit data based on source STA.
Independent B SS (IBSS) refers to a kind of like this BSS, and it includes one group of STA, and should can intercom mutually in the overlay area of this BSS each other by group STA.In IBSS, if each STA is positioned at the coverage of other STA, then each STA can carry out direct communication with any other STA in this IBSS.IBSS can be described as point to point network (ad hoc network) again.
Basis BSS refers to the BSS that is associated with expansion service group (ESS).ESS is identified by service groups identifier (SSID).The basis BSS BSS that is otherwise known as.Each BSS in the ESS is identified by BSS identifier (BSSID).Therefore, the STA in the BSS generally determines its relevance in BSS based on BSSID and SSID.
Each BSS comprises a plurality of STA and an access point (AP).Each STA in this access point and this BSS forms related.Access point is discerned each association by associated identifiers (AID).Access point can provide communication service based on the STA of association in BSS that sets up.Access point can have the function of STA.
The negotiable operating parameter of STA in BSS or the IBSS, be used to realize with this BSS or IBSS in the communicating by letter of other STA.This operating parameter comprises the determining the RF channel width used between the STA that communicates.The employed RF channel of communication can use 20MHz bandwidth or 40MHz bandwidth between the STA.This operating parameter also comprises the STA that communicates in given BSS or the IBSS distribution with the RF channel that uses.Each RF channel can include by the determined different frequency scope of IEEE 802.11 standards that is suitable for.20MHz RF channel can comprise single 20MHz channel.40MHz RF channel can comprise a 20MHz main channel and a 20MHz secondary channel.
This operating parameter also comprises STA modulator approach with use when passing through the RF channels transmit data of distributing.For example, STA based on the communication of IEEE 802.11g standard uses complementary code keying (CCK) modulation by RF channels transmit data the time, and uses OFDM (OFDM) modulation based on the STA of IEEE 802.11n standard communication by RF channels transmit data the time.
Collision detection multiple access (CSMA/CA) method of using the STA of IEEE 802.11 standards to use to have conflict to avoid obtains the visit to wireless medium.When a plurality of STA in the RF transmission coverage use overlapping RF channel to attempt the emission data simultaneously, in the wireless communication medium conflict can appear.When at least one frequency was shared by overlapping RF channel two or more and that deposit, the RF interchannel occurred overlapping.Conflict can cause the data transmission fails by this wireless communication medium, and then reduces the data transmission rate by STA emission data.
STAs related in the BSS_1 can be by 40MHz RF channel RF_1 communication, and STA related in the BSS_2 can be by 20MHz RF channel RF_2 communication.When at least a portion of RF_2 channel was included in the RF_1 channel again, BSSes BSS_1 and BSS_2 were called as overlapping BSSes (OBSS).When OBSS can appear at least one related in BSS_1 STA and is positioned at the RF coverage of BSS_2, and/or at least one STA of association in the BSS_2 is when being positioned at the RF coverage of BSS_1.For example, at least a portion of RF_2 channel can be corresponding at least a portion of the secondary channel of RF_1 channel.In this case, when the STA in the BSS_1 attempt communicating and with BSS_2 in communicating by letter and when depositing, just can produce conflict between the STA.
Compare the follow-up system that will introduce in conjunction with the accompanying drawings of the present invention, other limitation of prior art and drawback are conspicuous for the person of ordinary skill of the art.
Summary of the invention
The invention provides the method and system of coexistence between interior 20MHz of a kind of WLAN (wireless local area network) and the overlapping basic service sets of 40MHz (OBBS), carried out representing fully and describing in conjunction with at least one width of cloth accompanying drawing, and obtained more complete elaboration in the claims.
According to an aspect of the present invention, the invention provides a kind of method that transmits data, described method comprises:
Receive information frame at the receiving equipment place with a Wireless Communication Equipment set associative by wireless communication medium, wherein said information frame is by the Launch Equipment Shop emission of the Wireless Communication Equipment set associative different with another;
Reconfigure described receiving equipment, to launch and/or the employed RF channel width of received signal based on the described wireless communication medium of the information frame restricted passage of described reception.
As preferably, described method comprises: the information frame that determines whether described reception comprises the performance information of described transmitter.
As preferably, described method comprises: the one or more RF channel bandwidth limitations indications based on transmitting by described performance information reconfigure described receiving equipment.
As preferably, described method comprises: based on described reconfigure and/or described one or more RF channel bandwidth limitations indication in one or both, transmission information is given at least one miscellaneous equipment with described Wireless Communication Equipment set associative.
As preferably, described method comprises: do not have described performance information in the information frame based on described reception, reconfigure described receiving equipment.
As preferably, described method comprises: give at least one miscellaneous equipment with described Wireless Communication Equipment set associative based on the described transmission information that reconfigures.
As preferably, described method comprises: give immediately after described reconfiguring and reshuffle the timer value of putting.
As preferably, described method comprises: determine that whether information frame subsequently receives before reshuffling timer expiration described.
As preferably, described method comprises: when following one or both situations took place in described measuring period current time of reshuffling timer, to the described timer value of putting again of reshuffling:
In the information frame that receives subsequently, do not detect performance information; And/or
In the information frame that receives subsequently, detect particular value at one or more RF bandwidth constraints indications.
As preferably, described method comprises: during one or both situations below taking place in described measuring period current time of reshuffling timer, carry out reconfiguring subsequently of described receiving equipment after reshuffling timer expiration immediately described:
Described receiving equipment does not receive the information frame that does not contain performance information; And/or
Described receiving equipment does not receive the information frame that contains at the particular value of one or more RF bandwidth constraints indications.
As preferably, described reconfiguring subsequently returns to the operator scheme of carrying out before the described configuration with described receiving equipment.
As preferably, described method comprises: reconfigure described receiving equipment with one or more specific RF channels transmit of restricted passage and/or the used RF channel width of received signal.
According to a further aspect in the invention, the invention provides a kind of system that transmits data, described system comprises:
Be used for receiving one or more circuit of information frame with the receiving equipment place of a Wireless Communication Equipment set associative by wireless communication medium, wherein said information frame is by the Launch Equipment Shop emission of the Wireless Communication Equipment set associative different with another;
Described one or more circuit reconfigures described receiving equipment, to launch and/or the employed RF channel width of received signal based on the described wireless communication medium of the information frame restricted passage of described reception.
As preferably, described one or more circuit determine whether that the information frame of described reception comprises the performance information of described transmitter.
As preferably, described one or more circuit reconfigure described receiving equipment based on the one or more RF channel bandwidth limitations indications that transmit by described performance information.
As preferably, described one or more circuit based on described reconfigure and/or described one or more RF channel bandwidth limitations indication in one or both, transmission information is given at least one miscellaneous equipment with described Wireless Communication Equipment set associative.
As preferably, there is not described performance information in the information frame of described one or more circuit based on described reception, reconfigure described receiving equipment.
As preferably, described one or more circuit are given at least one miscellaneous equipment with described Wireless Communication Equipment set associative based on the described transmission information that reconfigures.
As preferably, described one or more circuit are given immediately after described reconfiguring and are reshuffled the timer value of putting.
As preferably, described one or more circuit determine that whether information frame subsequently receives before reshuffling timer expiration described.
As preferably, when following one or both situations took place in described measuring period current time of reshuffling timer described one or more circuit, to the described timer value of putting again of reshuffling:
In the information frame that receives subsequently, do not detect performance information; And/or
In the information frame that receives subsequently, detect particular value at one or more RF bandwidth constraints indications.
As preferably, during one or both situations below described one or more circuit take place, carry out reconfiguring subsequently of described receiving equipment after reshuffling timer expiration immediately in described measuring period current time of reshuffling timer described:
Described receiving equipment does not receive the information frame that does not contain performance information; And/or
Described receiving equipment does not receive the information frame that contains at the particular value of one or more RF bandwidth constraints indications.
As preferably, described reconfiguring subsequently returns to the operator scheme of carrying out before the described configuration with described receiving equipment.
As preferably, described one or more circuit reconfigure described receiving equipment with one or more specific RF channels transmit of restricted passage and/or the used RF channel width of received signal.
According to an aspect of the present invention, the present invention also provides a kind of system that transmits data, and described system comprises:
Be used for receiving by wireless communication medium one or more circuit of information frame at the receiving equipment place;
The Channel Identifier tabulation that generates in one or more communication channel identifier that described one or more circuit will be associated with the described information frame that receives and the described receiving equipment compares; And
Described one or more circuit reconfigures described receiving equipment, to launch and/or the employed RF channel width of received signal based on the described wireless communication medium of described comparative result restricted passage.
Various advantage of the present invention, various aspects and character of innovation, and the details of the embodiment of example shown in it will describe in detail in following description and accompanying drawing.
Description of drawings
Fig. 1 is the typical structure schematic diagram in conjunction with overlapping basic service sets (OBSS) in the WLAN of embodiment of the invention use;
Fig. 2 is another typical structure schematic diagram in conjunction with overlapping basic service sets (OBSS) in the WLAN of embodiment of the invention use;
Fig. 3 A is the flow chart that the WLAN terminal (STA) that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention;
Fig. 3 B is the flow chart that the WLAN terminal (STA) that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention, wherein this STA usage operation frame transmission (action frame transmission)
Fig. 3 C is the flow chart that the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention, and wherein state information is stored in the STA;
Fig. 3 D is the flow chart that the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention, wherein this STA usage operation frame transmission, and state information is stored in the STA;
Fig. 4 is the flow chart that the WLAN access point (AP) that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention;
Fig. 5 A carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS;
Fig. 5 B carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS, wherein this STA usage operation frame transmission;
Fig. 6 A carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS, and wherein state information is stored in the STA;
Fig. 6 B carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS, wherein this STA usage operation frame transmission, and state information is stored in the STA;
Fig. 7 carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN AP that is used for 20MHz and 40MHz coexistence in the OBSS;
Fig. 8 A is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in OBSS;
Fig. 8 B is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in the OBSS of usage operation frame transmission;
Fig. 9 A is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in the OBSS that uses explore frame (probe frame) transmission;
Fig. 9 B is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in the OBSS that uses the transmission of explore frame and action action frame;
Figure 10 is the flow chart of steps that coexists in OBSS and manage according to the embodiment of the invention.
Embodiment
Some embodiments of the present invention relate to the method and system of coexistence between interior 20MHz of a kind of wireless lan (wlan) and the overlapping basic service sets of 40MHz (OBBS).In the example WLAN according to IEEE 802.11 standardized operations, WLAN terminal (STA) or WLAN access point (AP) can pass through wireless communication medium receiving management frame, for example beacon frame.STA and/or AP can use 20MHz RF channel or the 40MHz RF channel selected from the different RF channel to communicate.In the exemplary embodiments of the present invention, management frames includes some information, and these information impel the STA of reception or AP at least one minimum time section of determining communication restriction to be communicated for using 20MHz RF channel.In another exemplary embodiments of the present invention, lack expected information in the management frames, will make the STA or the AP that receive at least one minimum time section of determining, communication restriction be communicated for using 20MHz RF channel.In other exemplary embodiments of the present invention, the management frames that receives can make the STA or the AP that receive that communication restriction is communicated for the RF channel that uses selected 20MHz bandwidth.
Fig. 1 is the typical structure schematic diagram in conjunction with overlapping basic service sets (OBSS) in the WLAN of embodiment of the invention use.As shown in Figure 1, show BSS_1 102 and BSS_2 132.BSS_1 102 comprises AP_1 112 and WLAN terminal STA _ A 114.BSS_2 132 comprises AP_2 142, STA_X 144 and STA_Y 146.
In the operation, the RF coverage of the signal of AP_1 112 emissions is overlay area 162.Being included in has STA_A 114 (being positioned at BSS_1 102) and a STA_Y 146 (being positioned at BSS_2 132) in this overlay area 162.The RF coverage of the signal of STA_X 144 emissions is overlay area 164.Being included in has STA_A 114, STA_Y 146 and an AP_2 142 (being positioned at BSS_2 132) in this overlay area 164.Like this, BSS_1 102 and BSS_2 132 just include OBSSes.
For example, when RF channel 122 includes at least a portion of secondary channel of RF channel 152, when transmitting simultaneously, AP_1112 and STA_X 144 just can clash.STA_A 114 detects less than the signal and/or the Frame that use the OFDM modulate emission by RF channel 152.Before the commencing signal transmission, STA_X 144 has carried out request by the main channel of RF channel 152 with AP_2 142 and has sent (RTS) and clear to send (CTS) frame turnaround sequence.The STA_A 144 that is configured to receive the signal in the secondary channel of RF channel 152 detects less than the RTS/CTS frame turnaround sequence between STA_X 144 and the AP_2 142.As a result, when STA_X 144 transmitted by RF channel 152, STA_A114 made AP_1 112 begin to carry out the signal emission by RF channel 122.
In the exemplary embodiments of the present invention, STA_Y 146 can receive management frames (for example beacon frame) and/or the Frame that is sent to STA_A 114 by AP_1 122 by RF channel 122.The frame that receives can comprise service quality (QoS) position, but does not contain HT performance information unit (IE).The value of QoS position can point out that this STA can run in the BSS in RF channel 122, RF channel 122 is based on service class definition and specifies and to be used for prioritised transmission.The value of QoS position (for example QoS_Bit=YES) can point out, STA can be during SP frame emission.When STA_Y 146 receives frame, can reconfigure to use 20MHz RF channel it.STA_Y 146 can initiate disassociation frame turnaround sequence to AP_2 142, and then initiates series of fortified passes connection frame sequence.After the connection of series of fortified passes, RF channel 154 can use the channel width of 20MHz.During series of fortified passes connection frame sequence, STA_Y 146 can launch information, HT performance information unit for example, and this information points out to configure STA_Y 146 to be used for the running of 20MHz channel width.HT performance information unit pack contains information, does not for example support 40MHz (40MHz_Intolerant) indication, 40MHz_Intolerant=YES wherein, and this information points out that STA_Y 146 request AP_2 142 are configured to the operation of 20MHz channel width.HT performance information unit also includes makes AP_2 142 can determine that STA_Y 146 supports the indication of 20MHz channel width operation (for example, to support bandwidth=20MHz, Supportee_Channel_Width=20MHz).
In the foregoing description, STA_Y 146 can receive the frame that includes HT performance information unit.This HT performance information unit pack contains information, for example 40MHz_Intolerant indication, wherein 40MHz_Intolerant=YES.Based on the reception of this frame, STA_Y 146 is configured to the operation of 20MHz channel width.STA_Y146 can carry out aforesaid disassociation/series of fortified passes connection sequence.
In the above embodiments of the present invention, STA_Y 146 can preserve with the operation of 20MHz channel width and reshuffle relevant state information.The state information of storage can make STA_Y 146 can keep being configured to the operation of 20MHz channel width in the minimum time section of determining.When in this minimum time section of determining, receiving next beacon frame (include QoS_Bit=YES in this frame and do not include HT performance information unit), with the value of replacement timer, STA_Y 146 can keep being configured to one section definite minimum time of 20MHz channel width operation after receiving this next beacon frame.Equally, when in this minimum time section of determining, receiving next beacon frame, (include HT performance information unit in this frame, 40MHz_Intolerant=YES wherein), also with the value of replacement timer, STA_Y 146 keeps being configured to one section definite minimum time of 20MHz channel width operation after receiving this next beacon frame.
When between the minimum time section of determining finishes, all not receiving next above-mentioned beacon frame, STA_Y 146 can be configured to the operation of 40MHz channel width.STA_Y 146 can initiate disassociation frame turnaround sequence to AP_2 142, and then initiates series of fortified passes connection frame sequence.After the connection of series of fortified passes, RF channel 154 can use the channel width of 40MHz.During the series of fortified passes connection frame sequence, STA_Y 146 can launch information, HT performance information unit for example, and this information is pointed out that STA_Y 146 has configured and is used for the operation of 40MHz channel width.This HT performance information unit pack contains information, for example 40MHz_Intolerant indication, and 40MHz_Intolerant=NO wherein, this information points out that STA_Y 146 does not ask AP_2 142 to be reconfigured for the operation of 20MHz channel width.HT performance information unit also includes and makes AP_2 142 can determine that STA_Y 146 supports the indication (for example Supported_Channel_Width=40MHz) of 40MHz channel width operation.
Fig. 2 is another typical structure schematic diagram in conjunction with overlapping basic service sets (OBSS) in the WLAN of embodiment of the invention use.BSS_1 202 and BSS_2 232 are arranged as shown in Figure 2.BSS_1 202 comprises AP_1 212 and STA_A 214.BSS_2 232 comprises AP_2 242, STA_X 244.AP_1 212 can communicate by letter with STA_A 214 by 20MHz RF channel 222.AP_2 212 can communicate by letter with STA_X 244 by 40MHz RF channel 252.AP_2 242 high-throughput (HT) AP that is otherwise known as.STA_X244 high-throughput (HT) STA that is otherwise known as.
In the operation, the RF coverage of the signal of STA_A 214 emissions is overlay area 262.Being included in has AP_1 212 (being positioned at BSS_1 202) and a STA_X 244 (being positioned at BSS_2 232) in this overlay area 262.Like this, BSS_1 102 and BSS_2 132 just include OBSSes.
In the exemplary embodiments of the present invention, STA_X 244 can receive management frames and/or the Frame by STA_A 214 emissions.STA_X 244 can check the BSSID of frame to determine to be associated with this frame that receives.STA_X 244 can determine the BSSID=202 that is associated with the frame with this receives of STA emission, rather than is associated with BSS_2 232.
In the above-mentioned exemplary embodiments of the present invention, STA_X 244 can attempt to judge whether it can determine the HT performance information of the BSS_1 202 that is identified by BSSID=202.When STA_X 244 can not determine out the HT performance of BSS_1 202, STA_X 244 can initiate disassociation frame turnaround sequence to AP_2 242, and then initiated series of fortified passes connection frame sequence.After the connection of series of fortified passes, RF channel 252 can use the channel width of 20MHz.During the series of fortified passes connection frame sequence, STA_X 244 can send information, HT performance information unit for example, and this information is pointed out that STA_X 244 has configured and is used for the operation of 20MHz channel width.HT performance information unit pack contains information, does not for example support 40MHz (40MHz_Intolerant) indication, 40MHz_Intolerant=YES wherein, and this information points out that STA_X 244 request AP_2 242 are reconfigured as the operation of 20MHz channel width.HT performance information unit also includes makes indication that AP_2 242 can determine that STA_X 244 supports the operation of 20MHz channel widths (for example, Supported_Channel_Width=20MHz).
In above-mentioned another exemplary embodiments of the present invention, STA_X 244 can receive management frames and/or the Frame by STA_A 214 emissions.STA_X 244 can partly receive this frame by the secondary channel of RF channel 252.STA_X 244 can detect the frame that receives to determine the BSSID relevant with the frame that receives.STA_X244 can determine the BSSID=202 that the frame with receiving of STA emission is associated, and is not associated with BSS_2 232.STA_X 244 can detect the frame that the receives transmitting station address (TA) with the STA that determines this frame that receives of emission.STA_X 244 can determine that this TA has identified STA_A 214.STA_X 244 emission management frames for example probe request are given STA_A 214, operate and/or configuration informations to STA_X 244 reports with request STA_A 214.For example, the probe request that STA_X 244 is launched can partly be launched by the secondary channel of RF channel 252, and receives by RF channel 222 at STA_A 214 places.
STA_A 214 can respond the probe request that receives, the emission detection response frame.This probing response frame can be by 222 emissions of RF channel.For the STA_A 214 that supports HT, this probing response frame can include HT performance information unit.This HT performance information unit includes 40MHz_Intolerant indication, 40MHz_Intolerant=YES wherein, and this information points out that STA_A 214 request reciever STA_X 244 are configured to the operation of 20MHz channel width.HT performance information unit also includes makes indication that STA_X 244 can determine that STA_A 214 supports the operation of 20MHz channel widths (for example, Supported_Channel_Width=20MHz).
For example, STA_X 244 can partly receive probing response frame by the secondary channel of RF channel 252.STA_X 244 can detect the probing response frame that receives and whether include HT performance information unit with the frame of determining to receive.When STA_X 244 determined that the probing response frame that receives does not contain HT performance information unit, STA_X 244 can initiate disassociation frame turnaround sequence to AP_2 242, and then initiated series of fortified passes connection frame sequence.After the connection of series of fortified passes, RF channel 252 can use the channel width of 20MHz.During the series of fortified passes connection frame sequence, STA_X 244 can launch information, HT performance information unit for example, and this information is pointed out that STA_X 244 has configured and is used for the operation of 20MHz channel width.HT performance information unit pack contains information, for example 40MHz_Intolerant indication, and 40MHz_Intolerant=YES wherein, this information points out that STA_X 244 request AP_2 242 are reconfigured as the operation of 20MHz channel width.HT performance information unit also includes makes indication that AP_2 242 can determine that STA_X 244 supports the operation of 20MHz channel widths (for example, Supported_Channel_Width=20MHz).
Perhaps, when STA_X 244 determines that the probing response frame that receives includes HT performance information unit, STA_X 244 will detect the content of this HT performance information unit.HT performance information unit in the probing response frame that receives can include information, for example 40MHz_Intolerant indication, wherein 40MHz_Intolerant=YES.Based on the reception of this frame, STA_X 244 is reconfigurable to be the operation of 20MHz channel width.STA_X 244 can carry out above-mentioned disassociation/series of fortified passes connection sequence.
Fig. 3 A is the flow chart that the WLAN terminal (STA) that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention.As shown in Figure 3A, in the step 302, STA can receive the frame of spontaneous emission side STA.Recipient STA also can receive the frame of spontaneous emission side AP.Recipient STA scans on several channels, receives from arbitrary emission side STA on the channel or frame of AP of being scanned.The frame that receives comprises management frames, for example beacon frame.In the step 304, recipient STA judges whether the frame that receives includes the QoS indication, and this indication points out that this frame is by launching at the STA that is used for running in the BSS in the RF channel of prioritised transmission based on service class definition appointment.This situation can be indicated by the value that QoS position in the frame is set, for example, and QoS_Bit=YSE.In the step 304, when recipient STA determines this QoS_Bit not by the value of putting (this value points out that STA can run in the BSS in the RF channel that is used for prioritised transmission based on service class definition appointment), in the step 306, whether include information unit in the frame that recipient STA determines to receive, this information unit indicates emission side STA can point out the HT performance, for example by HT performance information unit.When not including HT performance information unit in the frame that recipient STA determines to receive in the step 306, in the step 312, recipient STA continues its current operator scheme.
When including HT performance information unit in the frame that recipient STA determines to receive in the step 306, in the step 310, whether include the indication that request recipient STA is configured to the operation of 20MHz channel width in the frame that recipient STA attempts to determine to receive, for example, indicate by the 40MHz_Intolerant=YES in the HT performance information unit.When recipient STA in the step 310 determines that HT performance information unit does not include the 40MHz_Intolerant=YES indication, follow execution in step 312.
When recipient STA in the step 310 determined to include in the HT performance information unit 40MHz_Intolerant=YES indication, in the step 314, recipient STA was reconfigured for the operation of 20MHz channel width.In the step 316, recipient STA emission disassociation frame is given the HTAP in the associated BSS of recipient STA.Then, recipient STA sends the reassociation requests frame to relevant HTAP.This reassociation requests frame includes HT performance information unit.This HT performance information unit pack contains 40MHz_Intolerant=YES indication and Supported_Channel_Width=20MHz indication.This 40MHz_Intolerant=YES indication shows that the relevant HT AP of recipient STA request is configured to the operation of 20MHz channel width.This Supported_Channel_Width=20MHZ indication makes relevant HT AP can determine that recipient STA has been configured to the operation of 20MHz channel width.
(this value points out that STA can run in the BSS in the RF channel that is used for prioritised transmission based on service class definition appointment), then execution in step 308 when recipient STA determines QoS_Bit by the value of putting in the step 304.Step 308 is basic identical with step 306, and difference is in the step 308, when not including HT performance information unit in the frame that recipient STA determines to receive, follows execution in step 314.
Fig. 3 B is the flow chart that the WLAN terminal (STA) that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention, wherein this STA usage operation frame transmission.Among Fig. 3 B, step 302-314 is referring to the description to Fig. 3 A.In the step 346 (being connected on step 314 back), recipient STA send action frame is given the associated HT AP of this recipient STA.This action action frame includes 20MHz_BSS_Width_Requst=20MHz (20MHz_BSS bandwidth request=20MHz) indication.This 20MHz_BSS_Width_Requst=20MHz indication shows that the related HT AP of recipient STA request is reconfigured as the operation of 20MHz channel width.
In the step 315 (being connected on after the step 312), recipient STA generates channel list.Among each different embodiment of the present invention, when including current channel logo field in the frame that recipient STA determines to receive, recipient STA can generate channel list in step 315, and this channel list comprises the RF number of channel of pointing out in the frame that receives in current channel logo field or the step 302.
When not containing current channel logo field in the frame that recipient STA in the step 315 determines to receive, recipient STA generates channel list, and this channel list includes the number of channel that receives this frame place RF channel that receives.
In the step 352, recipient STA send action frame is given the HT AP that it was associated.This action action frame includes the 20MHz_BSS_Width_Requst=40MHz indication.It indicates that recipient STA does not ask related HT AP to be reconfigured as the operation of 20MHz channel width.
Fig. 3 C is the flow chart that the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention, and wherein state information is stored in the STA.Among Fig. 3 C, recipient STA handles frame and the storage and the relevant state information of this frame that receives of processing that receives.For example, recipient STA is provided with timer to measure received frame consumed time section afterwards.Shown in Fig. 3 C, step 302-314 is referring to the description to Fig. 3 A.Step 317 is basic identical with the step 316 among Fig. 3 A, and difference is in the step 317 that recipient STA is provided with the 40MHz_Intolerant timer.This 40MHz_Intolerant timer can be measured and receive frame from recipient STA and begin the spent time period, and it impels recipient STA to be configured to the operation of 20MHz channel width.The measured time quantum of 40MHz_Intolerant timer is corresponding to the minimum time section of determining.
In the step 318, recipient STA determines whether received the next frame that includes the 40MHz_Intolerant=YES indication in this minimum time section of determining.When recipient STA in the step 318 had determined to receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 320, this 40MHz_Intolerant timer was reset to measure next minimum time section.
When recipient STA in the step 318 determines not receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 322, recipient STA will judge in this minimum time section of determining whether received the next frame that includes the QoS_Bit=YSE indication.When determining to receive frame, recipient STA in the step 322 includes QoS_Bit=YSE when indication, then execution in step 320.
When not including the QoS_Bit=YSE indication in the frame that recipient STA determines to receive in the step 322, in the step 324, recipient STA will determine whether the 40MHz_Intolerant timer expires.When through the minimum time section of determining when also not receiving next frame, this 40MHz_Intolerant timer expiration, this will make recipient STA be configured to the operation of 20MHz channel width.When recipient STA in the step 324 determines that this 40MHz_Intolerant timer does not expire as yet, execution in step 318.
In step 324, when recipient STA determines that the 40MHz_Intolerant timer has expired, in the step 326, recipient STA judges whether it is the STA that supports HT, supports the STA of HT optionally to use operation of 20MHz channel width or the operation of 40MHz channel width.When recipient STA in the step 326 determined that it can not optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 328, recipient STA continued the operation of 20MHz channel width.
When recipient STA in the step 326 determines that it can optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 330, recipient STA will be configured to the operation of 40MHz channel width.In the step 332, recipient STA emission disassociation frame is given the HT AP in the BSS related with it.Then, recipient STA can be to its relevant HT AP emission reassociation requests frame.This reassociation requests frame includes HT performance information unit.This HT performance information unit pack contains 40MHz_Intolerant=NO indication and Supported_Channel_Width=40MHz indication.This 40MHz_Intolerant=NO indication shows that recipient STA does not ask related HT AP to be configured to the operation of 20MHz channel width.The Supported_Channel_Width=40MHz indication makes related HT AP can determine that this recipient STA has configured the operation of support 40MHz channel width.
Fig. 3 D is the flow chart that the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention, wherein this STA usage operation frame transmission, and state information is stored in the STA.Among Fig. 3 D, step 302-315 is with reference to the description to Fig. 3 B.Recipient STA can be in the action action frame shown in the step of transmitting 352 (referring to description and the further part to Fig. 3 B) after the step 315.
In the step 348 (being connected on after the step 314), recipient STA send action frame is given the HT AP related with it.This action action frame includes the 20MHz_BSS_Width_Requst=20MHz indication.It indicates that the related HT AP of recipient STA request is reconfigured as the operation of 20MHz channel width.Recipient STA also is provided with 40MHz_Intolerant restriction timer.The 40MHz_Intolerant timer is referring to top description.
In the step 318, recipient STA judges whether received the next frame that includes the 40MHz_Intolerant=YES indication in the minimum time section of determining.When recipient STA in the step 318 had determined to receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 320, the 40MHz_Intolerant timer was reset to measure next minimum time section.
When recipient STA in the step 318 determines not receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 322, recipient STA will judge in this minimum time section of determining whether received the next frame that includes the QoS_Bit=YSE indication.When determining to receive frame, recipient STA in the step 322 includes QoS_Bit=YSE when indication, then execution in step 320.
When not including the QoS_Bit=YSE indication in the frame that recipient STA determines to receive in the step 322, in the step 350, recipient STA will determine whether the 40MHz_Intolerant timer expires.When recipient STA in the step 350 determines that this 40MHz_Intolerant timer does not expire as yet, execution in step 318.
In step 350, when recipient STA determines that the 40MHz_Intolerant timer has expired, in the step 326, recipient STA judges whether it is the STA that supports HT, supports the STA of HT optionally to use operation of 20MHz channel width or the operation of 40MHz channel width.When recipient STA in the step 326 determined that it can not optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 328, recipient STA continued the operation of 20MHz channel width.
When recipient STA in the step 326 determines that it can optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 330, recipient STA will be configured to the operation of 40MHz channel width.In the step 352, recipient STA send action frame is given the HT AP related with it.This action action frame includes the 20MHz_BSS_Width_Requst=40MHz indication.It indicates that recipient STA does not ask related HT AP to be reconfigured as the operation of 20MHz channel width.
Fig. 4 is the flow chart that the WLAN access point (AP) that is used for 20MHz and 40MHz coexistence in the OBSS is reconfigured according to the embodiment of the invention.As shown in Figure 4, in the step 402, AP can be from the side of emission STA received frame.Recipient AP also can be from the side of emission AP received frame.The frame that receives comprises management (mgmt) frame, for example beacon frame or reassociation requests frame.In the step 404, recipient AP judges whether the frame that receives includes the QoS indication, and this indication points out that this AP can run in the BSS in the RF channel that is used for prioritised transmission based on service class definition appointment.This situation can be indicated by the value that QoS position in the frame is set, for example, and QoS_Bit=YSE.In the step 404, when recipient AP determines this QoS_Bit not by the value of putting (this value points out that STA can run in the BSS in the RF channel that is used for prioritised transmission based on service class definition appointment), in the step 406, whether include information unit in the frame that recipient AP determines to receive, this information unit indicates emission side STA can point out the HT performance, as passing through HT performance information unit.In the step 406, when not including HT performance information unit in the frame that recipient AP determines to receive, in the step 412, recipient AP continues its current operator scheme.
In the step 415 (being connected on after the step 412), recipient AP generates channel list.Among each different embodiment of the present invention, when including current channel logo field in the frame that recipient AP determines to receive, in step 415, recipient AP can generate channel list, and this channel list comprises in the current channel logo field or the RF number of channel of pointing out in the frame that receives in the step 402.
When not containing current channel logo field in the frame that recipient AP in the step 415 determines to receive, recipient AP generates channel list, and this channel list comprises and includes the number of channel that receives this frame place RF channel that receives.
Step 1011 (Figure 10) is connected on after the step 415.Recipient AP detects the channel list of generation to determine whether local BS S has used any channel in this channel list.Recipient AP can determine that the result is reconfigured as the operation of 20MHz channel width based on this.This processing procedure will provide in conjunction with Figure 10 and further describe.
When including HT performance information unit in the frame that recipient AP determines to receive in the step 406, in the step 410, whether include the indication that request recipient AP is reconfigured as the operation of 20MHz channel width in the frame that recipient AP attempts to determine to receive, for example, indicate by the 40MHz_Intolerant=YES in the HT performance information unit.When recipient AP in the step 410 determines that HT performance information unit does not include the 40MHz_Intolerant=YES indication, follow execution in step 412.
When recipient AP in the step 410 determined to include in the HT performance information unit 40MHz_Intolerant=YES indication, in the step 414, recipient AP was reconfigured for the operation of 20MHz channel width.In the step 416, recipient AP emission management frames for example beacon frame is given the associated BSS of recipient AP interior STA.This management frames includes HT performance information unit.This HT performance information unit comprises STA_Channel_Width=20MHz (STA channel width=20MHz) indication.This indication makes relevant HT STAs can determine that they will be reconfigured as the operation of support 20MHz channel width.Recipient AP is provided with the 40MHz_Intolerant timer.This 40MHz_Intolerant timer is measured and is begun consumed time section from recipient AP received frame, and it impels recipient AP to be configured to the operation of 20MHz channel width.The time quantum that the 40MHz_Intolerant timer is measured is corresponding to the minimum time section of determining.
(this value points out that STA can run in the BSS in the RF channel that is used for prioritised transmission based on service class definition appointment), then execution in step 408 when recipient AP determines QoS_Bit by the value of putting in the step 404.Step 408 is basic identical with step 406, and its difference is in the step 408, when not including HT performance information unit in the frame that recipient AP determines to receive, follows execution in step 414.
In the step 418, recipient AP determines whether received the next frame that includes the 40MHz_Intolerant=YES indication in this minimum time section of determining.When recipient AP in the step 418 had determined to receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 420, this 40MHz_Intolerant timer was reset to measure next minimum time section.
When recipient AP in the step 418 determines not receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 422, recipient AP will judge in this minimum time section of determining whether received the next frame that includes the QoS_Bit=YSE indication.When determining to receive frame, recipient AP in the step 422 includes QoS_Bit=YSE when indication, then execution in step 420.
When not including the QoS_Bit=YSE indication in the frame that recipient AP determines to receive in the step 422, in the step 424, recipient AP will determine whether the 40MHz_Intolerant timer expires.When through the minimum time section of determining when also not receiving next frame, this 40MHz_Intolerant timer expiration, this will make recipient AP be configured to the operation of 20MHz channel width.When recipient AP in the step 424 determines that this 40MHz_Intolerant timer does not expire as yet, execution in step 418.
In step 424, when recipient AP determines that the 40MHz_Intolerant timer has expired, in the step 426, recipient AP judges whether it is the AP that supports HT, supports the AP of HT optionally to use operation of 20MHz channel width or the operation of 40MHz channel width.When recipient AP in the step 426 determined that it can not optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 428, recipient AP continued the operation of 20MHz channel width.
When recipient AP in the step 426 determines that it can optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 430, recipient AP will be configured to the operation of 40MHz channel width.In the step 432, recipient AP emission management frames for example beacon frame is given STA in the BSS related with it.This management frames includes HT performance information unit.This HT performance information unit pack contains the STA_Channel_Width=40MHz indication.This indication makes related HT STA can determine that they are reconfigured to the operation of support 40MHz channel width.
In each different embodiment of the present invention, when including current channel logo field in the frame that recipient AP determines to receive, use this when being reconfigured as the RF channel that the recipient AP of 20MHz channel width operation can point out in using this current channel logo field and reconfigure, and when using other RF channel, use 20MHz or the operation of 40MHz channel width.
When not containing current channel logo field in the frame that recipient AP determines to receive, the recipient AP that is reconfigured as the operation of 20MHz channel width can use this and reconfigure when use receives the RF channel of this frame, and uses 20MHz or the operation of 40MHz channel width when using other RF channel.
Fig. 5 A carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS.The difference of Fig. 5 A and Fig. 3 A is that among Fig. 5 A, recipient STA does not assess the information relevant with QoS when handling the frame that receives.Shown in Fig. 5 A, in the step 602, STA is from the side of emission STA or AP receiving management frame.In the step 604, whether include information unit in the frame that recipient STA determines to receive, this information unit indicates emission side STA can point out the HT performance, for example by HT performance information unit.
When including HT performance information unit in the frame that recipient STA determines to receive in the step 604, in the step 606, whether include the indication that request recipient STA is reconfigured as the operation of 20MHz channel width in the frame that recipient STA attempts to determine to receive, for example, indicate by the 40MHz_Intolerant=YES in the HT performance information unit.When recipient STA in the step 606 determined that HT performance information unit does not include the 40MHz_Intolerant=YES indication, in the step 608, recipient STA continued its current operator scheme.
When recipient STA in the step 606 determined to include in the HT performance information unit 40MHz_Intolerant=YES indication, in the step 610, recipient STA was reconfigured for the operation of 20MHz channel width.In the step 612, recipient STA emission disassociation frame is given the HT AP in the associated BSS of recipient STA.Recipient STA sends the reassociation requests frame then to relevant HT AP.This reassociation requests frame includes HT performance information unit.This HT performance information unit pack contains 40MHz_Intolerant=YES indication and Supported_Channel_Width=20MHz indication.This 40MHz_Intolerant=YES indication shows that the relevant HT AP of recipient STA request is reconfigured as the operation of 20MHz channel width.This Supported_Channel_Width=20MHz indication makes relevant HTAP can determine that recipient STA has been configured to the operation of 20MHz channel width.
When not including HT performance information unit in the frame that recipient STA determines to receive in the step 604, follow execution in step 610, recipient STA continues the 20MHz operation.
Fig. 5 B carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS, wherein this STA usage operation frame transmission.Shown in Fig. 5 B, in the step 602, STA is from the side of emission STA or AP receiving management frame.In the step 603, whether include information unit in the frame that recipient STA determines to receive, this information unit indicates emission side STA can point out the HT performance, for example by HT performance information unit.
When including HT performance information unit in the frame that recipient STA determines to receive in the step 603, in the step 606, whether include the indication that request recipient STA is reconfigured as the operation of 20MHz channel width in the frame that recipient STA attempts to determine to receive, for example, indicate by the 40MHz_Intolerant=YES in the HT performance information unit.When recipient STA in the step 606 determined that HT performance information unit does not include the 40MHz_Intolerant=YES indication, in the step 608, recipient STA continued its current operator scheme.It is basic identical with the step 315 among Fig. 3 B to be connected on step 608 step 615 afterwards.Step 652 is basic identical with the step 352 among Fig. 3 B.It is basic identical with the step 346 among Fig. 3 B to be connected on step 610 step 646 afterwards.
When not including HT performance information unit in the frame that recipient STA determines to receive in the step 603, follow execution in step 608.
Fig. 6 A carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS, and wherein state information is stored in the STA.Among Fig. 6 A, recipient STA handles the relevant state information of the frame that receives after the frame receive and storage and the described processing.As shown in Figure 6A, step 602-610 is referring to the description to Fig. 5 A.Step 613 is basic identical with the step 612 among Fig. 5 A, and its difference is in the step 613 that recipient STA is provided with the 40MHz_Intolerant timer.
In the step 614, recipient STA determines whether received the next frame that includes the 40MHz_Intolerant=YES indication in this minimum time section of determining.When recipient STA in the step 614 had determined to receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 616, this 40MHz_Intolerant timer was reset to measure next minimum time section.When recipient STA determined not include in the next frame HT performance information unit, step 616 also can be connected on after the step 614.
When recipient STA in the step 614 determines not receive the next frame that includes the 40MHz_Intolerant=YES indication next frame of HT performance information unit (or do not comprise), in the step 618, recipient STA will judge whether definite 40MHz_Intolerant timer expires.When recipient STA in the step 618 determines that this 40MHz_Intolerant timer does not expire as yet, execution in step 614.
When recipient STA determines that the 40MHz_Intolerant timer has expired in the step 618, in the step 620, recipient STA judges whether it is the STA that supports HT, supports the STA of HT optionally to use operation of 20MHz channel width or the operation of 40MHz channel width.When recipient STA in the step 620 determined that it can not optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 622, recipient STA continued the operation of 20MHz channel width.
When recipient STA in the step 620 determines that it can optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 624, recipient STA will be configured to the operation of 40MHz channel width.In the step 626, recipient STA emission disassociation frame is given the HT AP in the BSS related with it.This recipient STA sends the reassociation requests frame to this relevant HT AP then.This reassociation requests frame includes HT performance information unit.This HT performance information unit pack contains 40MHz_Intolerant=NO indication and Supported_Channel_Width=40MHz indication.
Fig. 6 B carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN STA that is used for 20MHz and 40MHz coexistence in the OBSS, wherein this STA usage operation frame transmission, and state information is stored in the STA.Shown in Fig. 6 B, step 602-615 is referring to the description to Fig. 5 B.It is basic identical with the step 348 among Fig. 3 B to be connected on step 610 step 648 afterwards.Step 614 is connected on after the step 648, and step 614-624 is referring to the description to Fig. 6 A.It is basic identical with the step 352 among Fig. 3 B to be connected on step 624 or step 615 step 652 afterwards.
Fig. 7 carries out the less restricted flow chart that reconfigures according to the embodiment of the invention to the WLAN access point that is used for 20MHz and 40MHz coexistence in the OBSS.The difference of Fig. 7 and Fig. 4 is that among Fig. 7, recipient AP does not assess the information relevant with QoS when handling the frame that receives.As shown in Figure 7, in the step 702, AP is from the side of emission STA or AP receiving management frame.In the step 704, whether include information unit in the frame that recipient AP determines to receive, this information unit indicates emission side STA can point out the HT performance, for example by HT performance information unit.
When including HT performance information unit in the frame that recipient AP determines to receive in the step 704, in the step 706, whether include the indication that request recipient AP is reconfigured as the operation of 20MHz channel width in the frame that recipient AP attempts to determine to receive, for example, indicate by the 40MHz_Intolerant=YES in the HT performance information unit.When recipient AP in the step 706 determined that HT performance information unit does not include the 40MHz_Intolerant=YES indication, in the step 708, recipient AP continued its current operator scheme.It is basic identical with the step 415 among Fig. 4 to be connected on step 708 step 715 afterwards.Step 1011 (Figure 10) is connected on after the step 715.
When recipient AP in the step 706 determined to include in the HT performance information unit 40MHz_Intolerant=YES indication, in the step 710, recipient AP was reconfigured for the operation of 20MHz channel width.In the step 712, the STA in the recipient AP emission management frames BSS that for example beacon frame is given with it is associated.The management frames of emission includes HT performance information unit.This HT performance information unit pack contains the STA_Channel_Width=20MHz indication.This indication makes relevant HT STAs can determine that they will be configured to support the operation of 20MHz channel width.Recipient AP can be provided with a 40MHz_Intolerant timer.
In the step 714, recipient AP determines whether received the next frame that includes the 40MHz_Intolerant=YES indication in this minimum time section of determining.When recipient AP in the step 714 had determined to receive the next frame that includes the 40MHz_Intolerant=YES indication, in the step 716, this 40MHz_Intolerant timer was reset to measure next minimum time section.When recipient AP determined that next frame does not include HT performance information unit, step 716 also can be connected on after the step 714.
When recipient AP in the step 714 determines not receive the next frame that includes the 40MHz_Intolerant=YES indication next frame of HT performance information unit (or do not comprise), in the step 718, recipient AP will judge whether the 40MHz_Intolerant timer expires.When recipient AP in the step 718 determines that this 40MHz_Intolerant timer does not expire as yet, execution in step 714.
In step 718, when recipient AP determines that the 40MHz_Intolerant timer has expired, in the step 720, recipient AP judges whether it is the AP that supports HT, supports the AP of HT optionally to use operation of 20MHz channel width or the operation of 40MHz channel width.When recipient AP in the step 720 determined that it can not optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 722, recipient AP continued the operation of 20MHz channel width.
When recipient AP in the step 720 determines that it can optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 724, recipient AP will be reconfigured as the operation of 40MHz channel width.In the step 726, recipient AP emission management frames for example beacon frame is given STA in the BSS related with it.The management frames of emission includes HT performance information unit.This HT performance information unit pack contains the STA_Channel_Width=40MHz indication.
When not including HT performance information unit in the frame that recipient AP determines to receive in the step 704, be connected on step 704 execution in step 708 afterwards.
Fig. 8 A is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in OBSS.Shown in Fig. 8 A, in the step 802, recipient STA receives the frame that comes from the emission side STA related with external BSS.In the step 804, whether recipient STA determines known at this recipient STA place at the HT performance of this external BSS.When the HT of this external BSS performance was known for this recipient STA, in step 806, recipient STA can judge whether this HT performance shows that this external BSS operates in 40MHz (40MHz Intolerant) pattern of not supporting.When recipient STA in the step 806 determines that this external BSS operates in 40MHz Intolerant pattern, in the step 810, recipient STA is reconfigured as the operation of 20MHz channel width.In the step 812, recipient STA emission disassociation frame is given the HT AP in the BSS related with it.Recipient STA can launch the reassociation requests frame then to giving related HT AP.This reassociation requests frame includes HT performance information unit.This HT performance information unit pack contains 40MHz_Intolerant=YES indication and Supported_Channel_Width=20MHz indication.When recipient STA in the step 806 determines this external BSS is not when running on 40MHz Intolerant pattern, and in the step 808, recipient STA continues its current operator scheme.When recipient STA in the step 804 determines that the HT performance of this external BSS is not known concerning recipient STA, then execution in step 810.
Fig. 8 B is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in the OBSS of usage operation frame transmission.Shown in Fig. 8 B, step 802-808 is referring to the description to Fig. 8 A.It is basic identical with the step 315 among Fig. 3 B to be connected on step 808 step 815 afterwards.It is basic identical with the step 346 among Fig. 3 B to be connected on step 810 step 846 afterwards.It is basic identical with the step 352 among Fig. 3 B to be connected on step 815 step 852 afterwards.
Fig. 9 A is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in the OBSS that uses the explore frame transmission.Shown in Fig. 9 A, in the step 902, recipient STA receives the frame that comes from the emission side STA related with external BSS.In the step 904, whether recipient STA determines known at this recipient STA place at the HT performance of this external BSS.When the HT of this external BSS performance was known for this recipient STA, in the step 906, recipient STA can judge whether this HT performance shows that this external BSS operates in 40MHz Intolerant pattern.When recipient STA in the step 906 determined that this external BSS operates in 40MHz Intolerant pattern, in the step 907, recipient STA was reconfigured to the operation of 20MHz channel width.In the step 920, recipient STA emission disassociation frame is given the HT AP in the BSS related with it.Recipient STA can launch the reassociation requests frame then and give related HT AP.This reassociation requests frame includes HT performance information unit.This HT performance information unit pack contains 40MHz_Intolerant=YES indication and Supported_Channel_Width=20MHz indication.When recipient STA in the step 906 determines this external BSS is not when running on 40MHz Intolerant pattern, and in the step 910, recipient STA continues its current operator scheme.
When recipient STA in the step 904 determined that the HT performance of this external BSS is not known concerning recipient STA, in the step 912, recipient STA emission detection claim frame was given the emission side STA in this external BSS.In the step 913, recipient STA determines whether to receive probing response frame.When recipient STA in the step 913 determines not receive probing response frame, follow execution in step 907, otherwise execution in step 914.In the step 914, recipient STA receives the probing response frame from the emission side STA in the external BSS.In the step 916, recipient STA judges in the probing response frame that receives whether include HT performance information unit.When not including HT performance information unit in the probing response frame that recipient STA determines to receive in the step 916, execution in step 907.
When including HT performance information unit in the probing response frame that recipient STA determines to receive in the step 916, in the step 918, recipient STA judges whether this HT performance information unit that receives includes the value of representing 40MHz_Intolerant=YES.When recipient STA in the step 918 determines to include the value of representing 40MHz_Intolerant=YES in this HT performance information unit that receives, execution in step 907, otherwise execution in step 910.
Fig. 9 B is the flow chart of steps that realizes 20MHz and 40MHz coexistence according to the embodiment of the invention in the OBSS that uses the transmission of explore frame and action action frame.Shown in Fig. 9 B, step 902-918 is referring to the description to Fig. 9 A.It is basic identical with the step 346 among Fig. 3 B to be connected on step 907 step 946 afterwards.It is basic identical with the step 315 among Fig. 3 B to be connected on step 910 step 950 afterwards.It is basic identical with the step 352 among Fig. 3 B to be connected on step 950 step 952 afterwards.
Figure 10 is the flow chart of steps that coexists in OBSS and manage according to the embodiment of the invention.As shown in figure 10, in the step 1002, recipient AP receives action action frame, and management frames for example coexists.In the step 1006, whether the BSSID that recipient AP detects in the frame that receives is associated with external BSS with the emission side STA that determines this frame of emission.When recipient AP in the step 1006 determined that this side of emission STA is not associated with external BSS, in the step 1008, whether recipient AP judged to include in the frame receive and shows that 20MHz channel width operates requested value.When recipient AP in the step 1008 determined that the frame that receives points out that the operation of 20MHz channel width is requested, in the step 1012, recipient AP was configured to the operation of 20MHz channel width.
In the step 1016, the STA in the recipient AP emission management frames BSS that for example beacon frame is given with it is associated.This management frames includes HT performance information unit.This HT performance information unit comprises the STA_Channel_Width=20MHz indication.This indication makes relevant HT STAs can determine that they will be configured to support the operation of 20MHz channel width.Recipient AP can be provided with the 40MHz_Intolerant timer.
In the step 1018, recipient AP judges in the minimum time section of determining whether received the next frame that includes bandwidth (B/W) limit request, and this bandwidth constraints request makes recipient AP be reconfigured as the operation of 20MHz channel width.When recipient AP has determined to receive the next frame that includes the bandwidth constraints request in the step 1018, in the step 1020, this 40MHz_Intolerant timer will be reset to measure next minimum time section.Follow execution in step 1018.
When recipient AP in the step 1018 determined not receive the next frame that includes the bandwidth constraints request, in the step 1050, recipient AP judged whether the 40MHz_Intolerant timer expires.When recipient AP determines that the 40MHz_Intolerant timer does not expire as yet in the step 1050, execution in step 1018.
When recipient AP determines that the 40MHz_Intolerant timer has expired in the step 1050, in the step 1026, recipient AP judges whether it is the AP that supports HT, supports the AP of HT optionally to use operation of 20MHz channel width or the operation of 40MHz channel width.When recipient AP in the step 1026 determined that it can not optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 1028, recipient AP continued the operation of 20MHz channel width.
When recipient AP in the step 1026 determines that it can optionally use operation of 20MHz channel width or 40MHz channel width behaviour, in the step 1030, recipient AP will be reconfigured as the operation of 40MHz channel width.In the step 1032, recipient AP emission management frames for example beacon frame is given STA in the BSS related with it.The management frames of emission includes HT performance information unit.This HT performance information unit pack contains the STA_Channel_Width=40MHz indication.
When recipient AP in the step 1006 determines that emission side STA is associated with external BSS, in the step 1010, whether include in the frame that recipient AP judgement receives and show that this external BSS is the value that operates in 40MHz Intolerant pattern.When determining this external BSS of this frame that receives indication, recipient AP operates in 40MHz Intolerant pattern following time, execution in step 1012.
This external BSS of frame indication that recipient AP determines to receive in step 1010 operates in 40MHzIntolerant pattern following time, execution in step 1012.When recipient AP in the step 1010 determined that the frame that receives does not point out that this external BSS operates in 40MHz Intolerant pattern, in the step 1011, recipient AP detected the channel list from the frame that receives.In the step 1013, recipient AP judges any channel that whether has used in the local BS S in this channel list.When recipient AP in the step 1013 determined not use in the local BS S any channel in this channel list, in the step 1014, recipient AP continued its current operator scheme.When recipient AP in the step 1013 determines to have used in the local BS S channel in this channel list, execution in step 1012.
When emission side STA was related with external BSS, recipient STA can launch information in the action action frame that receives and give HT AP in the BSS related with it.In response, HT AP is based on the external BSS coexistence information that receives, and the send action frame is given the STAs in the BSS related with this.HT AP can start the coexistence managing timer based on receiving external BSS coexistence information.After the expiration of coexistence managing timer, HTAP launches next action action frame, and this next action action frame makes the STA in the related BSS use 20MHz or the operation of 40MHz channel width at channel in the channel list.
The method and system that the present invention is used for coexisting between interior 20MHz of WLAN and the 40MHz OBSS comprises receiver equipment, and for example WLAN terminal (STA) 146 is used for receiving information frame, for example management frames by wireless communication medium.This receiver equipment is associated with a Wireless Communication Equipment group, for example basic service sets (BSS) 132.The received information frame of receiver equipment by the emission method, apparatus for example the side's of emission access point 112 launched, this emission method, apparatus and external Wireless Communication Equipment group for example BSS 102 are associated.Receiver equipment can reconfigure emission of restricted passage wireless communication medium and/or the employed RF channel width of received signal based on the information frame that receives.
But receiver equipment reconfigure one or more specific RF channels transmit of restricted passage and/or the employed RF channel width of received signal, do not reconfigure and do not carry out this during by other RF channels transmit and/or received signal when this receiver equipment.Described one or more particular channel can determine based on channel list, and this channel list is positioned at the action action frame that the receives management frames that for example coexists.
Receiver equipment can determine whether the information frame that receives includes the performance information of launching method, apparatus, for example HT performance information unit.Receiver equipment can reconfigure based on one or more RF channel bandwidth limitations indications (for example 40MHz_Intolerant=YES indication), and this indication through performance information transmits.Receiver equipment can reconfigure and/or described one or more RF channel bandwidth limitations indication transmission information is given at least one miscellaneous equipment that is associated with this Wireless Communication Equipment group based on this.For example, after execution was reshuffled, the recipient STA 146 that is associated with BSS_2 132 can carry out disassociations/series of fortified passes connection frame sequence with AP_2 142.Receiver equipment can be based on not having performance information to reconfigure in the information frame of receiving.For example, recipient STA 146 can be reconfigured as the operation of 20MHz channel width based on receiving the management frames that does not contain HT performance information unit from AP_1 112.
Receiver equipment can be after reshuffling reconfigurable at once timer value of putting.This is reshuffled timer and can measure receiver equipment response and receive information frame and carry out one section definite minimum time section after reshuffling.Reshuffling timer will expire in the past in the minimum time section of determining.Receiver equipment can determine whether received next information frame before reshuffling timer expiration.Receiver equipment can be reset under following situation, and this reshuffles timer: a) detecting in the information frame of next reception does not have performance information; Or b) in the information frame of next reception, detects the particular value (for example 40MHz_Intolerant=YES) of indicating at one or more RF bandwidth constraints.After timer is reshuffled in replacement, will after replacement, begin the measurement of next minimum time section of determining.
Under the following situation, receiver equipment can this be reshuffled to carry out immediately after the timer expiration and reshuffle next time: a) receiver equipment does not receive the information frame that does not contain performance information; And/or b) receiver equipment does not receive the information frame that comprises the particular value that is directed to one or more RF bandwidth constraints indications.The execution of next time reshuffling is configured the operator scheme that has existed before with the frame that receiver equipment returns to the response reception.
An alternative embodiment of the invention provides a kind of computer-readable memory, the computer degree of its stored comprises at least one code segment, and described code segment is carried out by machine and made described machine carry out the method that coexists between the 20MHz and 40MHz OBSS in the above-described WLAN of being used for.
Therefore, the present invention can pass through hardware, software, and perhaps soft, combination of hardware realizes.The present invention can realize with centralized system at least one computer system, perhaps be realized with dispersing mode by the different piece in the computer system that is distributed in several interconnection.Anyly can realize that the computer system of described method or miscellaneous equipment all are applicatory.The combination of software and hardware commonly used can be the general-purpose computing system that computer program is installed, and by installing and carry out described program-con-trolled computer system, it is moved by described method.In computer system, utilize processor and memory cell to realize described method.
The present invention can also implement by computer program, and described program comprises whole features that can realize the inventive method, when it is installed in the computer system, by operation, can realize method of the present invention.Computer program in the presents refers to: one group of any expression formula of instructing that can adopt any program language, code or symbol to write, this instruction group makes system have information processing capability, with direct realization specific function, or after carrying out following one or two step, realize specific function: a) convert other Languages, coding or symbol to; B) reproduce with different forms.
The present invention describes by several specific embodiments, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, at particular condition or concrete condition, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (10)
1, a kind of method that transmits data is characterized in that, described method comprises:
Receive information frame at the receiving equipment place with a Wireless Communication Equipment set associative by wireless communication medium, wherein said information frame is launched by the emission reception of the Wireless Communication Equipment set associative different with another;
Reconfigure described receiving equipment, to launch and/or the employed RF channel width of received signal based on the described wireless communication medium of the information frame restricted passage of described reception.
2, method according to claim 1 is characterized in that, described method comprises: the information frame that determines whether described reception comprises the performance information of described transmitter.
3, method according to claim 2 is characterized in that, described method comprises: the one or more RF channel bandwidth limitations indications based on transmitting by described performance information reconfigure described receiving equipment.
4, method according to claim 3, it is characterized in that, described method comprises: based on described reconfigure and/or the indication of described one or more RF channel bandwidth limitations in one or both, transmission information is given at least one miscellaneous equipment with described Wireless Communication Equipment set associative.
5, method according to claim 2 is characterized in that, described method comprises: do not have described performance information in the information frame based on described reception, reconfigure described receiving equipment.
6, a kind of system that transmits data is characterized in that, described system comprises:
Be used for receiving one or more circuits of information frame by wireless communication medium with the receiving equipment place of a Wireless Communication Equipment set associative, wherein said information frame by the emission of the Wireless Communication Equipment set associative different with another receive launched;
Described one or more circuit reconfigures described receiving equipment, to launch and/or the employed RF channel width of received signal based on the described wireless communication medium of the information frame restricted passage of described reception.
7, system according to claim 6 is characterized in that, described one or more circuit determine whether that the information frame of described reception comprises the performance information of described transmitter.
8, system according to claim 7 is characterized in that, described one or more circuit reconfigure described receiving equipment based on the one or more RF channel bandwidth limitations indications that transmit by described performance information.
9, system according to claim 8, it is characterized in that, described one or more circuit based on described reconfigure and/or the indication of described one or more RF channel bandwidth limitations in one or both, transmission information is given at least one miscellaneous equipment with described Wireless Communication Equipment set associative.
10, a kind of system that transmits data is characterized in that, described system comprises:
Be used for receiving by wireless communication medium one or more circuit of information frame at the receiving equipment place;
The Channel Identifier tabulation that generates in one or more communication channel identifier that described one or more circuit will be associated with the described information frame that receives and the described receiving equipment compares;
Described one or more circuit reconfigures described receiving equipment, to launch and/or the employed RF channel width of received signal based on the described wireless communication medium of described comparative result restricted passage.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US98556007P | 2007-11-05 | 2007-11-05 | |
| US60/985,560 | 2007-11-05 | ||
| US11/952,202 | 2007-12-07 | ||
| US11/952,202 US9137672B2 (en) | 2006-12-09 | 2007-12-07 | Method and system for coexistence between 20 MHz and 40 MHz overlapping basic service sets (OBSS) in wireless local area networks |
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| Publication Number | Publication Date |
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| CN101577649A true CN101577649A (en) | 2009-11-11 |
| CN101577649B CN101577649B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101609464A Active CN101577649B (en) | 2007-11-05 | 2007-12-10 | Method and system for transmitting data in wlan |
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| CN (1) | CN101577649B (en) |
| HK (1) | HK1137578A1 (en) |
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| WO2012055260A1 (en) * | 2010-10-29 | 2012-05-03 | 中兴通讯股份有限公司 | Channel scanning method and system for wireless networks |
| CN102598769A (en) * | 2009-11-12 | 2012-07-18 | 交互数字专利控股公司 | Method and apparatus for providing very high throughput operation and capability signaling for wireless communications |
| WO2012152125A1 (en) * | 2011-05-09 | 2012-11-15 | 中兴通讯股份有限公司 | Method and device for group-configuring and managing wireless station in wireless local area network |
| CN103238281A (en) * | 2010-08-25 | 2013-08-07 | Utc消防及保安公司 | Frequency agility for wireless embedded system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100547975C (en) * | 2004-03-25 | 2009-10-07 | 联想(北京)有限公司 | A kind of loaming method of WLAN (wireless local area network) |
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2007
- 2007-12-10 CN CN2007101609464A patent/CN101577649B/en active Active
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2010
- 2010-02-04 HK HK10101223.5A patent/HK1137578A1/en not_active IP Right Cessation
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101577649B (en) | 2012-07-04 |
| HK1137578A1 (en) | 2010-07-30 |
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