CN104113905A - Downlink data transmitting and receiving method, and access point AP and station STA thereof - Google Patents

Downlink data transmitting and receiving method, and access point AP and station STA thereof Download PDF

Info

Publication number
CN104113905A
CN104113905A CN201310133153.9A CN201310133153A CN104113905A CN 104113905 A CN104113905 A CN 104113905A CN 201310133153 A CN201310133153 A CN 201310133153A CN 104113905 A CN104113905 A CN 104113905A
Authority
CN
China
Prior art keywords
message
send
sends
sta
permission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201310133153.9A
Other languages
Chinese (zh)
Other versions
CN104113905B (en
Inventor
杨绿溪
王敏
杨讯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honor Device Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201310133153.9A priority Critical patent/CN104113905B/en
Priority to PCT/CN2013/087408 priority patent/WO2014169650A1/en
Publication of CN104113905A publication Critical patent/CN104113905A/en
Application granted granted Critical
Publication of CN104113905B publication Critical patent/CN104113905B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a downlink data transmitting and receiving method, and an access point AP and a station STA thereof. The downlink data transmitting method comprises that the access point AP receives a first transmission-permitting message transmitted by the station STA, wherein the first transmission-permitting message comprises identification covering all BSSs of the STA; the AP determines the initial time when the AP transmits downlink data according to the first transmission-permitting message in order that the initial time determined by the AP is same as that determined by the APs of other BSSs in the first transmission-permitting message; and the AP begins to transmit the downlink data at the determined initial time. When all APs transmit data, the initial time when the data is transmitted is determined according to the received first transmission-permitting messages. By making the initial time determined by the APs same, the APs may synchronously transmit data and mutual interference generated by asynchronous data transmission of the APs in an overlapped area is prevented.

Description

Downlink data method of sending and receiving and access point AP and site STA
Technical field
The present invention relates to the communication technology, relate in particular to a kind of downlink data method of sending and receiving and access point AP and site STA.
Background technology
In 802.11 standards, an access point (Access Point is called for short AP) and a plurality of websites (Station be called for short STA) associated with AP form a Basic Service Set (Basic Service Set is called for short BSS).Conventionally, associated with this AP at the STA of the wireless signal coverage of AP.Carrier Sense Multiple Access mechanism (the Carrier Sense Multiple Access with Collision Avoidance that 802.11 defined WLAN (wireless local area network) (Wireless Local Area Networks is called for short WLAN) utilization is avoided with conflict, CSMA CA) make a plurality of website sharing wireless channel, but this random access way cannot guarantee synchronous between each transmitting node.
In actual application, a plurality of BSS occur that on overlay area overlapping situation is very general, thereby form overlapping BSS(Overlapping BSS, are called for short OBSS).When a plurality of AP send data to a plurality of STA that are positioned at OBSS respectively simultaneously, between them, disturb each other, in order to disturb at receiving terminal coherent reception signal elimination, need the strict time synchronized of each transmitting node and Frequency Synchronization.For example, STA1 and STA2 are positioned at OBSS, and AP1 sends data to STA1, AP2 sends data to STA2, and now, two STA1 and STA2 disturb each other, in order to eliminate and to disturb at receiving terminal (being STA), must guarantee to disturb alignment, guarantee the Frequency Synchronization of transmitting terminal time.
Summary of the invention
The invention provides a kind of downlink data method of sending and receiving and access point AP and site STA, for solving prior art, be positioned at the nonsynchronous problem of data of a plurality of AP that the STA of overlapping region receives.
First aspect present invention provides a kind of downlink data transmission method, comprising:
The first permission that access point AP receiving station STA sends sends message, and wherein, described first allows to send the sign that message comprises all Basic Service Set BSS that cover described STA;
Described AP allow to send message according to described first and determines that described AP sends the initial time of downlink data, makes the definite initial time of described AP and described first allow the definite initial time of the AP of other BSS in transmission message identical;
Described AP starts to send downlink data in definite initial time.
In the possible implementation of the first of first aspect present invention, described AP allows to send message according to described first and determines that the initial time of described AP transmission downlink data comprises:
Described AP determines that the BSS of self correspondence allows to send the order in message described first;
Described AP determines time to count and waiting time according to described order, according to described time to count and waiting time, determines described initial time.
In the possible implementation of the second of first aspect present invention, receive the first permission transmission message of STA transmission at AP before, also comprise:
When described AP need to send downlink data, whether idlely identify down channel to be used;
If it is idle that described AP recognizes described down channel, to the STA transmission of downlink data to be sent, represent the first request transmission message of the promoter that described AP is the described down channel of use, with first permission of indicating described STA sign to send, send message corresponding to the promoter of the described down channel of use.
In the third possible implementation of first aspect present invention, when described AP need to send downlink data, whether the free time comprises to identify down channel to be used:
When described AP need to send downlink data, judge whether to receive that first permission corresponding with down channel to be used sends message;
If so, determine that described down channel is busy, and send the estimated time that takies of carrying in message according to described the first permission, determine the release time of described down channel;
If not, determine that described down channel is idle.
In the 4th kind of possible implementation of first aspect present invention, described AP determines that according to described order time to count and waiting time comprise:
Whether described AP allows to send message identification self corresponding to the promoter who uses described down channel according to described first;
If so, definite time that receives described the first permission transmission message of described AP is time to count, and allows transmission message to determine that self sends the waiting time of downlink data according to described first;
If not, described AP sends the second request according to described order and sends message, and the second permission that reception is returned sends message, using receiving described second, allow the time that sends message as time to count, and allow transmission message to determine the waiting time that self sends downlink data according to described first, wherein, described the second request sends message for representing the promoter of the described down channel of the non-use of described AP, to indicate second of described STA sign transmission to allow to send the non-promoter corresponding to using described down channel of message.
In the 5th kind of possible implementation of first aspect present invention, described AP allow to send message according to described first and determines that the waiting time that self sends downlink data comprises:
Described AP obtains described STA and receives the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS;
Described AP allows to send the quantity N of each BSS in message according to described first, and from the sequence number n in each BSS, based on following formula, determines waiting time:
T'=(N-n)×T+T SIFS
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.
In the 6th kind of possible implementation of first aspect present invention, described AP sends the second request transmission packet according to described order and draws together:
Described AP, according to the sequence number n from each BSS, calculates and sends the required waiting time T'' of described the second request transmission information based on following formula:
T''=(n-2)×T；
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving described the first request, send the duration of message, T cTSfor sending message according to described the first request, send the duration that described the first permission sends message.
In the 7th kind of possible implementation of first aspect present invention, described AP obtains described STA and receives the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTScomprise:
Described AP allows to send message from described first and resolves and obtain the duration T that described STA reception the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS.
In conjunction with seven kinds of possible implementations of the first to the of this first aspect present invention and first aspect, in the 8th kind of possible implementation of first aspect present invention, described BSS is designated the MAC Address of AP.
Second aspect present invention provides a kind of downlink data method of reseptance, comprising:
Site STA receives the request transmission message that access point AP sends;
Described STA sends message generation according to described request and allows to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover described STA in message, and send described permission transmission message to described AP, to indicate described AP to send message according to described permission, determine the initial time that sends downlink data, wherein, to send the definite initial time of AP that in message, each BSS is corresponding identical for described permission;
Described STA is according to definite initial time downlink data receiving.
In the possible implementation of the first of second aspect present invention, described STA sends message generation according to described request and allows to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover self in message, and to described AP, sends described permission transmission packet and draw together:
Described STA is carried in order described permission by the sign of AP corresponding to all BSS that cover self and sends in message, and the quantity of carrying all BSS;
Described STA sends described permission and sends message.
In the possible implementation of the second of second aspect present invention, also comprise:
Described STA is when access network, and physical location when change, and scanning covers the described all BSS of self, the line item of going forward side by side.
The first and the possible implementation of the second in conjunction with second aspect present invention and second aspect, in the third possible implementation of second aspect present invention, described STA sends message generation according to described request and allows to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover self in message, and to described AP, sends described permission transmission packet and draw together:
Whether the identification that sends a request message described in described STA basis is to use the promoter of down channel to send;
If so, described STA is carried at the sign that covers all BSS of self to allow to send in message, and identifies described permission transmission message corresponding to the promoter who uses described down channel;
If not, described STA is carried at the sign that covers all BSS of self to allow to send in message, and identifies the non-promoter corresponding to using described down channel of described permission transmission message;
Described in described STA broadcast transmission, allow to send message.
Third aspect present invention provides a kind of access point AP, comprising:
Receiver module, the first permission sending for receiving station STA sends message, and wherein, described first allows to send the sign that message comprises all Basic Service Set BSS that cover described STA;
Initial time determination module, determines that for allow sending message according to described first described AP sends the initial time of downlink data, makes the definite initial time of described AP and described first allow the definite initial time of the AP of other BSS in transmission message identical;
Sending module, starts to send downlink data for the initial time definite.
In the possible implementation of the first of third aspect present invention, described initial time determination module comprises:
Order determining unit, for determining that the BSS that described AP is corresponding sends the order of message in described the first permission;
Time determining unit, for determining time to count and waiting time according to described order, determines described initial time according to described time to count and waiting time.
In the possible implementation of the second of third aspect present invention, described AP also comprises:
Whether idle channel identification module, for when described AP need to send downlink data, identify down channel to be used;
If it is idle that described AP recognizes described down channel, to the STA transmission of downlink data to be sent, represent the first request transmission message of the promoter that described AP is the described down channel of use, with first permission of indicating described STA sign to send, send message corresponding to the promoter of the described down channel of use.
In the third possible implementation of third aspect present invention, described channel identification module specifically for:
When described AP need to send downlink data, judge whether to receive that first permission corresponding with down channel to be used sends message;
If so, determine that described down channel is busy, and send the estimated time that takies of carrying in message according to described the first permission, determine the release time of described down channel;
If not, determine that described down channel is idle.
In the 4th kind of possible implementation of third aspect present invention, described time determining unit specifically for:
According to described first, allow to send message and whether identify described AP corresponding to the promoter who uses described down channel;
If so, definite time that receives described the first permission transmission message is time to count, and allows transmission message to determine that self sends the waiting time of downlink data according to described first;
If not, according to described order, send the second request and send message, and the second permission that reception is returned sends message, by the time that receives described the second permission transmission message, it is time to count, and allow to send according to described first the waiting time that message is determined described AP transmission downlink data, wherein, described the second request sends message for representing the promoter of the described down channel of the non-use of described AP, to indicate second of described STA sign transmission to allow to send the non-promoter corresponding to using described down channel of message.
In the 5th kind of possible implementation of third aspect present invention, described time determining unit allow to send according to described first the waiting time that message determines that described AP sends downlink data and comprises:
Obtain described STA and receive the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS;
According to described the first permission, send the quantity N of each BSS in message, and the sequence number n of described AP in each BSS, based on following formula, determine waiting time:
T'=(N-n)×T+T SIFS
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.
In the 6th kind of possible implementation of third aspect present invention, described time determining unit sends the second request transmission packet according to described order and draws together:
Sequence number n according to described AP in each BSS, calculates and sends the required waiting time T'' of described the second request transmission information based on following formula:
T''=(n-2)×T；
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving described the first request, send the duration of message, T cTSfor sending message according to described the first request, send the duration that described the first permission sends message.
In the 7th kind of possible implementation of third aspect present invention, described in obtain described STA and receive the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTScomprise:
From described first, allow to send message and resolve and obtain the duration T that described STA reception the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS.
In conjunction with seven kinds of possible implementations of the first to the of third aspect present invention and the third aspect, in the 8th kind of possible implementation of third aspect present invention, described BSS is designated the MAC Address of AP.
Fourth aspect present invention provides a kind of site STA, comprising:
Request sends message sink module, the request transmission message sending for receiving access point AP;
Sending module, for send message generation according to described request, allow to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover described site STA in message, and send described permission transmission message to described AP, to indicate described AP to send message according to described permission, determine the initial time that sends downlink data, wherein, to send the definite initial time of AP that in message, each BSS is corresponding identical for described permission;
Data reception module, for according to definite initial time downlink data receiving.
In the possible implementation of the first of fourth aspect present invention, described sending module comprises:
Information generating unit, is carried in order described permission by the sign of AP corresponding to all BSS that cover described STA and sends in message, and the quantity of carrying all BSS;
Information transmitting unit, sends message for sending described permission.
In the possible implementation of the second of fourth aspect present invention, also comprise:
Scan module, for when the described STA access network, and during physical location change, scanning covers all BSS of described STA, the line item of going forward side by side.
In conjunction with fourth aspect present invention and fourth aspect the first, to the possible implementation of the second, in the third possible implementation of fourth aspect present invention, also comprise:
Message identification module, for sending a request message described in basis, whether identification is to use the promoter of down channel to send;
If so, described sending module is carried at the sign that covers all BSS of described STA to allow to send in message, and identifies described permission transmission message corresponding to the promoter who uses described down channel;
If not, described sending module is carried at the sign that covers all BSS of described STA to allow to send in message, and identifies the non-promoter corresponding to using described down channel of described permission transmission message;
Described sending module sends described permission and sends message.
The embodiment of the present invention provides a kind of method of sending and receiving and access point AP and site STA of downlink data, method provided by the invention, when AP has downlink data to send, receive that STA broadcast transmission first allows all AP that send message all according to receive first, to allow transmission message to determine the initial time that sends data, when initial time then just starts to send data, by making the definite initial time of each AP identical, thereby guarantee that each AP can synchronized transmission data, avoided each AP in overlapping region to send the phase mutual interference that data produce when asynchronous.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of downlink data transmission method embodiment mono-of the present invention;
Fig. 2 is the flow chart of downlink data transmission method embodiment bis-of the present invention;
Fig. 3 is overlapping schematic diagram between two BSS that the embodiment of the present invention was suitable for;
Fig. 4 is the flow chart of downlink data method of reseptance embodiment tri-of the present invention;
Fig. 5 is two AP of the present invention frequency deviation schematic diagrames while simultaneously sending data to a STA;
Fig. 6 is two AP of the present invention sampling frequency offset schematic diagrames while simultaneously sending data to a STA;
Fig. 7 is the flow chart of downlink data transmission method embodiment tetra-of the present invention;
Fig. 8 is the schematic diagram that two AP send data simultaneously;
The structural representation of the AP that Fig. 9 provides for the invention process five;
The structural representation of the AP that Figure 10 provides for the embodiment of the present invention six;
The structural representation of the STA that Figure 11 provides for the embodiment of the present invention seven;
The structural representation of the STA that Figure 12 provides for the embodiment of the present invention eight;
The structural representation of the AP that Figure 13 provides for the embodiment of the present invention nine;
The structural representation of the STA that Figure 14 provides for the embodiment of the present invention ten.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the flow chart of downlink data transmission method embodiment mono-of the present invention.The method that the present embodiment provides can be carried out by downlink data dispensing device, and downlink data dispensing device is integrated in AP, it will be understood by those skilled in the art that AP can provide for wireless terminal the network equipment of wireless signal transmitting-receiving service.The wireless signal that each AP provides can cover certain position range, while arranging a plurality of AP, is cellular each overlay area and forms whole wireless network.May there is the situation that overlay area is overlapping in the region that each AP is adjacent.This overlapping region can be that two AP are overlapping, can be also that three or more AP are overlapping.STA may be arranged in this overlapping region, can receive the wireless signal that two above AP send, but STA can the mechanism based on certain select one of them AP to provide service for it.For example based on power, select, the embodiment of the present invention does not limit this.
For the STA that is positioned at overlapping region, during its downlink data receiving, may disturb, for the mode of aliging by interference at receiving terminal is eliminated interference, in the time of must guaranteeing that each AP sends data to the STA in overlapping region, can send simultaneously, the present embodiment is that head it off provides downlink data transmission method, and any one AP all can carry out the method.
The method that the present embodiment provides, comprises the following steps:
Step 101, AP receive the first permission transmission message that STA sends, and wherein, first allows to send the sign that message comprises all Basic Service Set BSS that cover STA.
In the present embodiment, STA is positioned at the overlapping region of a plurality of BSS overlay area.Be that STA is positioned at OBSS, therefore, STA can scan all BSS that cover self.STA allows to send message to the AP broadcast transmission first that covers all BSS of self, because the wireless signal of the AP of these BSS covers this STA, so the AP of these BSS can receive the first permission and send message, first allows to carry in message the sign (Basic Service Set Identity is called for short BSSID) of all BSS that cover STA.BSSID can control (Media Access Control is called for short MAC) address for the media interviews of AP, also can be for other identify, because BSS is corresponding with AP, so the sign of BSS can determine AP.The STA that need to serve to oneself as AP sends before downlink data, AP can send a request to this STA and send message (Request To Send is called for short RTS), is receiving that the permission that this STA returns sends message (Clear To Send, be called for short CTS) after, AP could send data.In this step, the CTS that AP receives, can be self issue RTS and trigger the CTS returning, and can be also that other AP issue and trigger STA after RTS and return.
Step 102, AP send message according to the first permission and determine that self sends the initial time of downlink data, make the definite initial time of AP and first allow the definite initial time of the AP of other BSS in transmission message identical.
In the present embodiment, because sending the first permission to the AP of all these STA of covering, STA sends message, therefore, each AP is after receiving the first permission transmission message, if there are data to send, according to the first permission, send message and determine that self sends the initial time of downlink data, it is all identical making the definite initial time of each AP.
Step 103, AP start to send downlink data in definite initial time.
AP, after determining the initial time that sends downlink data, waits for that initial time then starts to send downlink data.Because the definite initial time of each AP is all identical, therefore, guarantee that each AP synchronously sends downlink data to corresponding STA.
The method that the present embodiment provides, when AP has downlink data to send, receive that STA broadcast transmission first allows all AP that send message all according to receive first, to allow transmission message to determine the initial time that sends data, when initial time then just starts to send data, by making the definite initial time of each AP identical, thereby guarantee that each AP can synchronized transmission data, avoided each AP in overlapping region to send the phase mutual interference that data produce when asynchronous.
Have each AP of overlapping region, if there is not the demand that sends downlink data simultaneously, it can send separately in the different time, must can not disturb.The technical scheme of the embodiment of the present invention is mainly applicable to each AP will take the situation that certain down channel sends data simultaneously, now, by STA, send and allow to send other AP that message is known each AP to exist overlapping region, thereby timing to same time starts to send downlink data, to guarantee synchronized transmission data.When AP produces identical down channel and sends data, this interferences is particularly evident, and at non-overlapping region, AP can independently be used this down channel, and at overlapping region, has the mechanism of each AP competition use down channel, will describe in detail by embodiment below.
Fig. 2 is the flow chart of downlink data transmission method embodiment bis-of the present invention, and how the present embodiment, on the basis of embodiment mono-, sends message according to the first permission to each AP and determine that the initial time that sends data is described in detail.The method that the present embodiment provides specifically comprises the following steps:
When step 201, AP need to send downlink data, whether idlely identify down channel to be used.
It should be noted that, due to OFDM (Orthogonal Frequency Division Multiplexing, abbreviation OFDM) antijamming capability of technology is stronger, therefore a plurality of adjacent BSS can be used identical frequency resource transmission data, when a plurality of adjacent BSS have in overlapping situation.Fig. 3 is overlapping schematic diagram between two BSS that the embodiment of the present invention was suitable for, as shown in Figure 3, BSS1 and BSS2 have overlapping region, the i.e. overlapping region of two overlay areas in figure, STA1 and STA2 are in overlapping region, when AP1 is sent to STA1 by data, AP2 also can send data to STA2, at this moment between two transmitting nodes, disturbs each other.The STA that is positioned at overlapping region can receive the data of all AP transmissions that cover this STA, and therefore, the data that STA1 receives can be subject to the interference of STA2.
When AP need to send downlink data, whether the free time is specially to identify down channel to be used, when AP need to send downlink data, judges whether to receive that first permission corresponding with down channel to be used sends message.If, be that AP receives that first permission corresponding with down channel to be used sends message, determine that down channel is busy, now AP is non-corresponding to promoter, and according to the first permission, send the estimated time that takies of carrying in message, determine the release time of down channel.If not, AP does not receive that first permission corresponding with down channel to be used sends message, determines that down channel is idle, and now AP is corresponding to promoter.A plurality of AP may send RTS simultaneously, and the AP that first receives the CTS returning is the promoter as initiating this idle channel to use, and other AP are non-promoter.
If AP recognizes the down channel free time, to the STA transmission of downlink data to be sent, represent the first request transmission message of the promoter that AP is use down channel, to indicate the first permission that STA sign sends to send message corresponding to the promoter of use down channel.
Particularly, the Fig. 3 of take describes as example, as shown in Figure 3, for example AP1 has data to send to STA1, whether idlely detect channel, AP1 judges oneself whether to receive that first permission corresponding with down channel to be used sends message, if AP1 does not receive, illustrate that down channel is idle, at this moment AP1 sends the first request to STA1 and sends message, the first request sends message for representing that AP1 is the promoter who uses down channel, STA1 sends after message in first request that receives, to AP1 and AP2 broadcast first, allow to send message, and identify this and first allow to send the corresponding promoter with using down channel of message.AP1 and AP2 can receive the first permission transmission message that STA1 returns, if at this moment AP2 also has data to send, whether AP2 detects channel idle, AP2 detects and receives that the first permission that down channel to be used is corresponding sends message, therefore judges that down channel is busy, in the present embodiment, AP1 and AP2 are used identical down channel to send data, when AP1 is used this channel, concerning AP2, this channel is just occupied, is busy channel.
Step 202, AP receive the first permission transmission message that STA sends, and wherein, first allows to send the sign that message comprises all BSS that cover STA.
When AP is during corresponding to promoter, AP, also needs to send the first request to data STA to be sent and sends after message after the free time at judgement down channel, could receive the first permission transmission message that STA sends.In the present embodiment, STA adopts the mode of broadcast to send the first permission to the AP that covers all BSS of this STA and sends message.
First allows to send the sign that message comprises all BSS that cover STA, and each AP is receiving that the first permission sends after message like this, can know that own and other BSS have overlapping region.
Step 203, AP determine that the BSS of self correspondence sends the order in message in the first permission.
In the present embodiment, in the first permission, send the sign that not only carries all BSS of this STA of covering in message, and each BSS sign has certain order.Particularly, the sign of BSS corresponding to promoter AP is placed in to first, the order of the sign of other BSS can arbitrarily be placed.Each AP sends after message receiving the first permission, resolves the BSS that obtains self correspondence and sends the order in message in the first permission.
Step 204, AP determine time to count and waiting time according to order, according to time to count and waiting time, determine initial time.
Whether AP sends message identification self corresponding to the promoter who uses down channel according to the first permission.Particularly, whether AP is according to the order identification of the BSS of self correspondence getting in step 203 self corresponding to promoter, and when the order of BSS corresponding to AP is positioned at first, AP judges that self is corresponding to promoter.If the order of the BSS that AP is corresponding is not first, AP judges that self is non-corresponding to promoter.
If AP judgement self is corresponding to promoter, AP determines that it is time to count that reception first allows the time of transmission message, and determines that according to the first permission transmission message self sends the waiting time of downlink data.Still take Fig. 3 as example, AP1 judges that oneself is as promoter, and AP1 obtains STA1 and receives the duration T that the first request sends message rTS, and obtain STA1 according to the duration T of first request transmission message transmission the first permission transmission message cTS, AP can send message and resolve and obtain the duration T that STA receives the first request transmission message from the first permission rTS, and send according to the first request the duration T that message sends the first permission transmission message cTS.
AP1 is obtaining T rTSand T cTSafter, according to the quantity N of each BSS in the first permission transmission message, and from the sequence number n in each BSS, sequence number n represents the order in the first permission transmission message of BSS, determines waiting time: T'=(N-n) * T+T based on following formula sIFS, wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.In the present embodiment, first allows to carry T in transmission message rTSand T cTS, AP1 can resolve and obtain.Be understandable that, for all AP, T rTSand T cTSall certain.Therefore, AP does not also resolve and obtains each time, and AP can be provided with these durations in advance, and according to the good T of these duration calculation.The order that in the present embodiment, N is 2, BSS is 1, and at this moment, concerning AP1, waiting time is (2-1) * T+T sIFS=T+T sIFS.
If AP judges that self is non-corresponding to promoter, AP sends the second request according to the order of the BSS of self correspondence and sends message, and the second permission that reception is returned sends message, by the time that receives the second permission transmission message, be time to count, and determine that according to the first permission transmission message self sends the waiting time of downlink data.Wherein, the second request sends message for representing the promoter of the non-use down channel of AP, to indicate second of STA sign transmission to allow to send the non-promoter corresponding to using down channel of message.
In the present embodiment, AP2 judges that self is non-corresponding to promoter, AP2 is existing according to the order from the first permission transmission message, to STA2, send the second request and send message, AP2, according to the sequence number n from each BSS, calculates and sends required waiting time T'':T''=(the n-2) * T of the second request transmission information based on following formula; Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving the first request, send the duration of message, T cTSfor send message according to the first request, send the duration that the first permission sends message.In the present embodiment, the order of AP2 is 2, therefore, waiting time is T''=(2-2) * T=0, and AP2 does not need to wait for, receiving that the first permission sends after message, just to STA2, send the second request and send message, and identify the non-promoter corresponding to using down channel of this second request transmission message, STA2 sends after message in second request that receives, to AP2 transmission second, allow to send message, and the second permission that sign sends sends the non-promoter corresponding to down channel of message.AP2 sends the non-promoter corresponding to using down channel of message to recognizing the second permission after receiving the second message, take that to receive the time that the second permission sends message be time to count.
AP2, after determining time to count, sends message according to the first permission and determines that self sends the waiting time of downlink data.AP2 obtains STA1 and receives the duration T that the first request sends message rTS, obtain STA1 and send according to the first request the duration T that message sends the first permission transmission message cTS; According to the first permission, send the quantity N of each BSS in message, and from the sequence number n in each BSS, based on following formula, determine waiting time: T'=(N-n) * T-T sIFS, wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.In the present embodiment, AP2 definite waiting time is T sIFS, AP2 waits a short frame period just can send downlink data after the second permission that receives STA2 transmission sends message.
In the present embodiment, AP1 is promoter, and therefore, AP1 determines that it is time to count that reception first allows the time point of transmission message, and waiting time is T+T sIFS, the definite initial time of AP1 is the time point of time to count after waiting time, AP1, after receiving the first permission transmission message, waits for T+T sIFSafter duration, start to send data.The definite time to count of AP2 is the second time that allows to send message that receives that STA2 returns, and AP2 definite waiting time is T sIFStherefore, the initial time of AP2 allows to send after message for receiving first, adds that AP2 sends the duration that the second request sends and allows the duration of message with receiving the second request through total waiting time for sending the waiting time of the second request message, and adds and send downlink data required waiting time.The duration that second request to be sent such as AP2 sends message is 0, and total waiting time is for sending the waiting time T of downlink data sIFSallow the duration of transmission message and receive the duration T sum that the first permission sends message with transmission second, so AP2 waits for T+T after receiving the first permission transmission message sIFSafter duration, as initial time, start to send downlink data.
Thus, the initial time that known AP1 and AP2 calculate is the same, when initial time then, AP1 and AP2 can send data simultaneously.
Step 205, AP start to send downlink data in definite initial time.
Each AP, when definite initial time then starts to send downlink data, is identical by the definite initial time of known each AP of step 204, therefore, can guarantee each AP synchronized transmission data.
Be understandable that, in the present embodiment, when AP2 does not have data to send, not zero computing time, AP1 works as initial time then, sends data.If when AP2 does not have data to send certainly, can notify AP1, AP1 can cancel the initial time of setting, directly sends data.In actual use procedure, because request sends message and allow to send message all very short, sending request the time of transmission and receiving allows the time of transmission also very short, therefore, even if AP2 does not notify AP1 not have data to send, the time of waiting for for AP1 is not long yet, can not cause the waste in resource.
The method that the present embodiment provides, AP is before sending data, send after message receiving the first permission, the order sending in message in the first permission according to the BSS of self correspondence is determined time to count and waiting time, and determines initial time according to time to count and waiting time.When initial time then just starts to send data, by making the definite initial time of each AP identical, thereby guarantee that each AP can synchronized transmission data.
Fig. 4 is the flow chart of downlink data method of reseptance embodiment tri-of the present invention, and the method that the present embodiment provides is carried out by downlink data receiving system, and this device can be integrated in STA, and the method that the present embodiment provides comprises the following steps:
Step 301, STA receive the request transmission message that AP sends.
When AP has data to send to STA, first to STA, send request transmission message, STA receives the request transmission message that AP sends.
Step 302, STA send message generation according to request and allow to send message, allow to send the sign of carrying all BSS that cover self in message, and send and allow to send message to AP, with indication AP, according to allowing to send message, determine the initial time that sends downlink data, wherein, allow to send the definite initial time of AP that in message, each BSS is corresponding identical.
STA sends after message in the request that receives AP transmission, STA is carried at the sign that covers all Basic Service Set BSS of self to allow to send in message and broadcasts to each AP, particularly, STA is carried at the sign of AP corresponding to all BSS that cover self in order and allows to send in message, and the quantity of carrying all BSS.STA broadcast transmission allows to send message, so that cover the AP that all BSS of this STA are corresponding, can receive permission transmission message.
STA is when access network, and physical location when change, and scanning covers all BSS of self, the line item of going forward side by side.
Step 303, STA are according to definite initial time downlink data receiving.
AP then sends data to corresponding STA in definite initial time, and STA is according to definite initial time downlink data receiving.
The method that the present embodiment provides, STA is receiving that the request that AP sends sends after message, the sign that covers all BSS of self is carried to allow to send in message and broadcasts to each AP, so that each AP determines an initial transmitting time according to allowing to send message, allow to send the definite initial time of AP that all BSS of carrying in message are corresponding identical, when initial transmitting time then, each AP is simultaneously to the STA synchronized transmission downlink data of data to be sent.By making the definite initial time of each AP identical, thereby guarantee that each AP can synchronized transmission data.
In an alternative embodiment of the invention, on the basis of embodiment tri-, the STA in step 302 is carried at the sign that covers all BSS of self to allow to send and in message, broadcasts to each AP and be specially:
First, whether STA is to use the promoter of down channel to send according to the identification that sends a request message.If so, described STA is carried at the sign that covers all BSS of self to allow to send in message, and sign allows to send message corresponding to the promoter who uses described down channel.If not, STA is carried at the sign that covers all BSS of self to allow to send in message, and sign allows to send the non-promoter corresponding to using down channel of message.
Particularly, whether the request sending to STA at AP sends in message can identify this request message corresponding to the promoter who uses down channel.STA is after getting this request message, according to sign judge AP whether corresponding to promoter, if the promoter corresponding to down channel, the permission of returning to each AP is sent to message identifier for the promoter corresponding to using down channel, if it is non-corresponding to promoter that AP judges this AP according to request message, identify this permission and send the non-promoter corresponding to using down channel of message.STA allows to send message to each AP broadcast transmission.
Disturbing alignment is the key technology in next generation wlan.In these technology, all exist a plurality of transmitters to send the scene of data simultaneously, only have the strict time synchronized of each transmitting node and Frequency Synchronization, receiving terminal could be correct demodulates data.A kind of main application scenarios of the present invention disturbs alignment exactly, be positioned at the interference that data that the STA of overlapping region receives can be subject to other STA of overlapping region, therefore, in order to disturb at receiving terminal coherent reception signal elimination, must guarantee that each AP can guarantee time synchronized and Frequency Synchronization when STA sends data.What the present invention mainly solved is exactly the problem of time synchronized, below simply introduces the problem of Frequency Synchronization and solution.
Because the oscillator of each transmitting node AP is independently, so there is a carrier wave frequency deviation as shown in Figure 5 with respect to receiving node STA in each transmitting node, and Fig. 5 is two AP of the present invention frequency deviation schematic diagrames while simultaneously sending data to a STA.Carrier wave frequency deviation between AP1 and STA1 is △ f 1, the carrier wave frequency deviation of AP2 and STA1 is △ f 2, the sample frequency due to receiving node is also different simultaneously, therefore can produce sampling timing frequency deviation as shown in Figure 6.Although can be by the leading frequency deviation that estimates, and eliminate the interference between subcarrier.But this can not eliminate frequency deviation completely, although this residual frequency departure can not bring serious ICI, passing in time, can bring skew to OFDM data symbol.Below the example by concrete is illustrated to how receiving terminal realizes synchronous in time and frequency.
Fig. 7 is the flow chart of downlink data transmission method embodiment tetra-of the present invention, originally be implemented on the basis of embodiment bis-, the present embodiment need to align to eliminate interference by interference with receiving terminal, how to realize time and frequency synchronously for example is elaborated, the present embodiment also be take the scene shown in Fig. 3 and is illustrated as example, suppose that AP1 is corresponding to promoter, AP2 is non-corresponding to promoter, and the method that the present embodiment provides specifically comprises the following steps:
It is idle that step 401, AP1 recognize down channel to be used, sends the first request send message to STA1.
When AP1 has data to send, first whether idlely identify down channel, in the present embodiment, AP1 is for being used the promoter of down channel, AP1 judgement self does not receive first permission corresponding with down channel to be used and sends message, judge that down channel is idle, to STA1, send the first request and send message, this first request sends message and represents that AP1 is the promoter who uses down channel, particularly, the identification information that AP1 can carry a bit in the first request transmission message identifies this first request transmission message by using the promoter of down channel to send.
Step 402, STA1 receive the first request transmission message that AP1 sends, and send message generation allow to send message according to the first request, allow to carry the sign of all BSS that cover self in transmission message, and broadcast to each AP.
STA1, according to the BSS1 scanning in advance and the BSSID of BSS2, judges and lays oneself open in overlapping region, particularly, if STA1 can only scan a BSS, judge and lay oneself open to Non-overlapping Domain, if STA1 scans two or more BSS, judge and lay oneself open in overlapping region.When receiving the first request, STA1 sends after message, according to the first request, send the leading frequency deviation that estimates of message, the transmitting terminal of self is synchronized to AP1, leading long training field (Long Training Filed is called for short LTF) and the Short Training field (Short Training Filed is called for short STF) of comprising, LTF is used for carrying out channel estimating, STF is used for carrying out frequency deviation estimation, and method of estimation is prior art particularly, therefore repeat no more here.STA1 to the crystal oscillator of transmitting terminal, has realized synchronous in frequency by the compensate of frequency deviation of estimating.Due to the interference of noise, by the frequency deviation of leading estimation, can not eliminate completely frequency deviation, also can there is residual frequency departure, although residual frequency departure can not bring serious inter-carrier interference, As time goes on, can bring skew to OFDM data symbol.STA1 is synchronized to the transmitting terminal of self after AP1, the number of the sign of the BSS1 scanning and BSS2 and the BSS that scans is carried to the first permission to be sent in message, and according to the identification information of the first permission transmission message, judgement AP1 is for being used the promoter of down channel, the first permission being sent to message identifier is corresponding to the promoter who uses down channel, the first permission is sent to information broadcast and send to AP1 and AP2.
First allows to send message specifically can realize by following method, as shown in Table 1, first allow to send message comprises: frame control information, take the estimated time, the BSS number scanning, all BSSID and Frame Check Sequence (Frame Check Sequence,, be called for short FCS).Frame control information comprises the IP address of transmitting terminal, the IP address of receiving terminal etc., take the estimated time for sending the required time of data to be sent, AP1 carries this and takies the estimated time in the first request sending to STA1 sends message particularly, STA1 is after receiving the first request message, getting from the first request message takies the estimated time and is carried at the first permission and send in message, be broadcast to each AP, so that other AP estimate according to taking the release time that duration is determined down channel, when taking the estimated time then, AP has successfully sent data, discharge down channel.First allow to send the number that also carries all BSS that STA1 scans in message, and the BSSID of each BSS, and each BSSID is according to necessarily tactic.
Table one
Step 403, AP1 receive first of STA1 broadcast transmission and allow to send message, send message determine that self sends the initial time of downlink data according to the first permission.
In the present embodiment, AP1 sends after message in the first permission that receives STA1 transmission, first according to the first permission, send message identification self whether when using the promoter of down channel, concrete, if the corresponding BSS that AP sends in message in the first permission is sequentially positioned at first, judge that self is corresponding to promoter, if not first, judge that self does not correspond to promoter.
When AP1 identifies self corresponding to promoter, determine that it is time to count that reception first allows the time of transmission message, and determine that according to the first permission transmission message self sends the waiting time of downlink data.Particularly, AP1 obtains STA1 and receives the duration T that the first request sends message rTS, obtain STA1 and send according to the first request the duration T that message sends the first permission transmission message cTS; AP1 sends the quantity N of each BSS in message according to the first permission, and from the sequence number n in each BSS, determines waiting time: T'=(N-n) * T-T based on following formula sIFSwherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.AP1 is T+T according to above-mentioned formula definite waiting time sIFS, AP1 will receive that the first permission sends after message through T+T sIFStime point after duration is defined as initial time.
Step 404, AP2 receive first of STA1 broadcast transmission and allow to send message, send message determine that self sends the initial time of downlink data according to the first permission.
In the present embodiment, AP2 sends after message in the first permission that receives STA1 transmission, the sign that the first permission sends the BSS that carries self correspondence in message is obtained in parsing, first according to the first permission, sends the leading estimation frequency deviation in message, and the transmitting terminal of self is synchronized to AP1.Then, AP2 sends message according to the first permission and identifies this and first allow to send message when using the promoter of down channel, and then, the order identification self of BSS that sends in message self correspondence according to the first permission is non-corresponding to promoter.
AP2 identification self is non-corresponding to promoter, according to the BSS of self correspondence, sequentially send the second request and send message, and receive return second allow to send message, using receiving second, allow the time that sends message as time to count.Particularly, AP2, according to the sequence number n from each BSS, calculates and sends required waiting time T'':T''=(the n-2) * T of described the second request transmission information based on following formula; Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving the first request, send the duration of message, T cTSfor send message according to the first request, send the duration that the first permission sends message.The waiting time that definite transmission the second request of AP2 sends is 0, and therefore, AP2 directly sends the second request to STA2 and sends message, and the second request sends message and is used for representing that AP2 is non-corresponding to promoter.
STA2 sends after message in second request that receives, recognize AP2 non-corresponding to promoter, second permission that is carried in order of the BSS1 scanning and BSS2 is sent in message, and the number of BSS is also carried in the second permission transmission message, the second permission that STA2 sign sends sends the non-promoter corresponding to use down channel of message.STA2 also allows to send message to AP1 and AP2 broadcast transmission second.
AP2 is after receiving the second permission transmission message, using receiving second, allow the time that sends message as time to count, and determine that according to the first permission transmission message self sends the waiting time of downlink data, determine that waiting time can be with reference to the description in embodiment bis-, AP2 definite waiting time is T sIFS, so AP2 total waiting time of determining for sending the waiting time of the second request message, add that AP2 sends the duration that the second request sends and allows the duration of message with receiving the second request, and add and send downlink data required waiting time.Therefore, AP2 total waiting time is T+T sIFS.Be that AP2 waits for T+T after receiving the first permission transmission message sIFSafter, start to send data.By step 402 and 403 known AP1 and the definite initial time of AP2, be identical.
Be understandable that, step 403 and step 404 be the order of priority not, is to carry out side by side.
Step 405, AP1 and AP2 in initial time then, send data simultaneously.
By step 402 and 403 known AP1 and the definite initial time of AP2, be identical, send the second permission send after message at STA2, AP1 and AP2 have reached Timing Synchronization and Frequency Synchronization, and now, AP1 and AP2 can send downlink data simultaneously.As shown in Figure 8, Fig. 8 is the schematic diagram that two AP send data simultaneously.
Step 406, STA1 and STA2, after receiving the data of AP1 and AP2 transmission, estimate residual frequency deviation according to the pilot tone of carrying in downlink data, and align to eliminate interference by interference.
How the STA1 of take estimates residual frequency deviation according to pilot tone, suppose that AP1 is at subcarrier k as example illustrates 1and k 2launched respectively pilot tone with aP2 is at k 1and k 2place sends zero subcarrier, supposes that AP2 is at subcarrier k 1and k 2place does not send carrier wave, and STA1 is at k 1and k 2place receives pilot tone and is with with by following form, represent:
Wherein with be respectively subcarrier k 1and k 2the noise at place, H 11(k) refer to that AP1 is to the channel matrix of STA1, H 12(k) refer to that AP2 is to the channel matrix of STA1. and θ 1, θ 2be respectively the skew that residual frequency deviation and sampling frequency offset cause.Order V k 1 = H 11 ( k 1 ) × P k 1 , V k 2 = H 11 ( k 2 ) × P k 2 , ?
Because with all real number,
ε wherein 1and ε 2be the error of introducing due to noise, above simultaneous, two formulas can estimate θ 1with use the same method, can obtain θ 2with
STA1 is according to the skew that estimates, eliminates the skew causing due to residual frequency deviation and sampling frequency offset.
The method that the present embodiment provides, receiving terminal STA allows to send message according to receive first, according to the first permission, send leading in message and realize the synchronous of frequency, and further according to the first permission, send the initial time that message is determined transmission data, the initial time definite due to each AP is identical, therefore can guarantee temporal synchronous.
The structural representation of the AP that Fig. 9 provides for the invention process five, as shown in Figure 9, the AP that the present embodiment provides comprises: receiver module 51, initial time determination module 52 and sending module 53.
Receiver module 51, the first permission transmission message sending for receiving STA, wherein, first allows to send the sign that message comprises all Basic Service Set BSS that cover STA.
In the present embodiment, STA is positioned at the overlapping region of a plurality of BSS overlay area, and therefore, STA can scan all BSS that cover self.When STA broadcast transmission first allows to send message, because the wireless signal of the AP of these BSS covers this STA, so the AP of these BSS can receive the first permission, send message, first allows to carry in message the sign BSSID of all BSS that cover STA.BSSID can be the MAC Address of AP, also can be for other identify, because BSS is corresponding with AP, so the sign of BSS can determine AP.The STA that need to serve to oneself as AP sends before downlink data, and AP can send a request to this STA and send message RTS, and after receiving the permission transmission message CTS that this STA returns, AP could send data.In this step, the CTS that AP receives, can be self issue RTS and trigger the CTS returning, and can be also that other AP issue and trigger STA after RTS and return.
Initial time determination module 52, for what receive according to receiver module 51, first allow to send message and determine that access point AP sends the initial time of downlink data, make the definite initial time of AP and first allow the definite initial time of the AP of other BSS in transmission message identical.
Sending module 53, starts to send downlink data in definite initial time.
The initial time that sending module 53 is definite according to initial time determination module 52, then starts to send downlink data in initial time.Because the definite initial time of each AP is all identical, therefore, guarantee that each AP synchronously sends downlink data to corresponding STA.
The AP that the present embodiment provides, can be used for the method shown in execution graph 1, and implementation method and technique effect are similar, can, with reference to the description in embodiment mono-, repeat no more here.
The AP that the present embodiment provides, when AP has downlink data to send, receive that STA broadcast transmission first allows all AP that send message all according to receive first, to allow transmission message to determine the initial time that sends data, when initial time then just starts to send data, by making the definite initial time of each AP identical, thereby guarantee that each AP can synchronized transmission data, avoided each AP in overlapping region to send the phase mutual interference that data produce when asynchronous.
The structural representation of the AP that Figure 10 provides for the embodiment of the present invention six, as shown in figure 10, the AP that the present embodiment provides comprises:
Receiver module 61, the first permission transmission message sending for receiving STA, wherein, first allows to send the sign that message comprises all Basic Service Set BSS that cover STA.
Initial time determination module 62, determines that for send message according to the first permission access point AP sends the initial time of downlink data, makes the definite initial time of AP and first allow the definite initial time of the AP of other BSS in transmission message identical.
Sending module 63, starts to send downlink data in definite initial time.
In the present embodiment, initial time determination module 62 comprises: order determining unit 621 and time determining unit 622.
Wherein, order determining unit 621, for determining that the BSS that AP is corresponding sends the order of message in the first permission.The first permission that order determining unit 621 receives according to receiver module 61 sends message, determines that the BSS that AP is corresponding sends the order in message in the first permission, and first allows to send the sign that carries each BSS in message, and respectively sign is arranged in certain sequence.
Time determining unit 622, for determining time to count and waiting time according to order, determines initial time according to time to count and waiting time.
During this has been implemented, when AP receives the first permission transmission message, also need to identify self whether corresponding promoter with using down channel.If AP identifies self correspondence and promoter, determine that it is time to count that reception first allows the time of transmission message, and determine that according to the first permission transmission message self sends the waiting time of downlink data.Time determining unit 622 sends according to the first permission the stand-by period that message determines that AP sends downlink data and is specially: first obtain STA and receive the duration T that the first request sends message rTS, and STA sends according to the first request the duration T that message sends the first permission transmission message cTS, then, according to the first permission, send the quantity N of each BSS in message, and the sequence number n of AP in each BSS, based on following formula, determine waiting time: T'=(N-n) * T+T sIFS, wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.AP determines initial time according to time to count and waiting time, can be with reference to embodiment bis-.
If AP identification self non-correspondence and promoter, according to order, send the second request and send message, and the second permission that reception is returned sends message, using receiving second, allow the time that sends message as time to count, and determine that according to the first permission transmission message self sends the waiting time of downlink data.Wherein, the second request sends message for representing the promoter of the non-use down channel of AP, to indicate second of STA sign transmission to allow to send the non-promoter corresponding to using down channel of message.Time determining unit 622 sends the second request transmission packet according to order and draws together: the sequence number n according to AP in each BSS, calculates and sends required waiting time T'':T''=(the n-2) * T of the second request transmission information based on following formula; Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving described the first request, send the duration of message, T cTSfor send message according to the first request, send the duration that the first permission sends message.AP determines initial time according to time to count and waiting time, can be with reference to embodiment bis-.
The AP that the present embodiment provides also comprises, whether idle channel identification module 64, for when AP need to send downlink data, identify down channel to be used.Whether idle channel identification module 64 identify down channel to be used before receiving the first permission transmission message of STA broadcast transmission at receiver module 61.Particularly, when AP need to send downlink data, channel identification module 64 judges whether to receive that first permission corresponding with down channel to be used sends message; If so, determine that down channel is busy, and according to the first permission, send the estimated time that takies of carrying in message, determine the release time of down channel.If not, determine that down channel is idle.
If channel identification module 64 recognizes the down channel free time, to the STA transmission of downlink data to be sent, represent the first request transmission message of the promoter that AP is use down channel, to indicate the first permission that STA sign sends to send message corresponding to the promoter of use down channel.If it is busy that channel identification module 64 recognizes down channel, determine according to the first permission and send the estimated time that takies of carrying in message, determine the release time of down channel.
The AP that the present embodiment provides, can be used for carrying out the embodiment of the present invention one, two is the scheme that embodiment tetra-provides, implementation method and technique effect are similar, repeat no more here.
The structural representation of the STA that Figure 11 provides for the embodiment of the present invention seven, the STA that the present embodiment provides comprises: request sends message sink module 71, sending module 72 and data reception module 73.
Request sends message sink module 71, the request transmission message sending for receiving AP.
When AP has data to send to STA, first to STA, send request transmission message, STA receives the request transmission message that AP sends.
Sending module 72, for send message generation according to described request, allow to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover STA in message, and send and allow to send message to this AP, with indication AP, according to allowing to send message, determine the initial time that sends downlink data, wherein, allow to send the definite initial time of AP that in message, each BSS is corresponding identical.
STA sends after message in the request that receives AP transmission, STA is carried at the sign that covers all Basic Service Set BSS of self to allow to send in message and broadcasts to each AP, particularly, STA is carried at the sign of AP corresponding to all BSS that cover self in order and allows to send in message, and the quantity of carrying all BSS.STA broadcast transmission allows to send message, so that cover the AP that all BSS of this STA are corresponding, can receive permission transmission message.
STA is when access network, and physical location when change, and scanning covers all BSS of self, the line item of going forward side by side.
Data reception module 73, for according to definite initial time downlink data receiving.
AP then sends data to corresponding STA in definite initial time, and STA is according to definite initial time downlink data receiving.
The STA that the present embodiment provides implements three technical schemes that provide for carrying out, and implementation method and technique effect are similar, therefore repeat no more here.
The structural representation of the STA that Figure 12 provides for the embodiment of the present invention eight, the STA that the present embodiment provides comprises: request sends message sink module 81, message identification module 82, sending module 83 and data reception module 84.
Request sends message sink module 81, the request transmission message sending for receiving AP.
Whether message identification module 82 is to use the promoter of down channel to send for identifying according to sending a request message.If so, sending module 83 is carried at the sign that covers all BSS of STA to allow to send in message, and identifies this permission transmission message corresponding to the promoter who uses down channel; If not, sending module 83 is carried at the sign that covers all BSS of STA to allow to send in message, and identifies the non-promoter corresponding to using down channel of this permission transmission message.
Sending module 83, for send message generation according to request, allow to send message, allow to send the sign of carrying all Basic Service Set BSS that cover STA in message, and send and allow to send message to AP, with indication AP, according to allowing to send message, determine the initial time that sends downlink data, wherein, allow to send the definite initial time of AP that in message, each BSS is corresponding identical.
Data reception module 84, for according to definite initial time downlink data receiving.
In the present embodiment, sending module 83 comprises: information generating unit 831 and information transmitting unit 832.Wherein, information generating unit 831 is for the sign of AP corresponding to all BSS that cover STA is carried in order and allows to send message, and the quantity of carrying all BSS; Information transmitting unit 832, allows to send message for sending.STA can send downlink data to each AP in the mode of broadcast.
Further, also comprise scan module 85 in the present embodiment, for when the STA access network, and during physical location change, scanning covers all BSS of STA, the line item of going forward side by side.When STA receives the request transmission message of AP transmission, all BSS that scan according to scan module 85, are carried at the sign that covers all BSS of STA in order and allow to send in message.
The technical scheme that the STA that the present embodiment provides provides for carrying out above-described embodiment three and four, implementation method and technique effect are similar, repeat no more here.
The structural representation of the AP that Figure 13 provides for the embodiment of the present invention nine, as shown in figure 13, the AP90 that the present embodiment provides comprises:
Receiver 91, processor 92, memory 93 and reflector 94.Wherein, receiver 91, memory 93 and reflector 94 can be connected with processor 92 by bus or alternate manner respectively, be connected to example describe in Figure 13 with bus.Wherein, memory 93 is for stores executable programs code, and this program code comprises computer-managed instruction.The method that the downlink data that the program that processor 92 is stored in memory 93 by operation realizes the embodiment of the present invention to be provided sends.Bus can be industry standard architecture (Industry Standard Architecture, referred to as ISA) bus, peripheral component interconnect (Peripheral Component, referred to as PCI) bus or extended industry-standard architecture (Extended Industry Standard Architecture, referred to as EISA) bus etc.Described bus can be divided into address bus, data/address bus, control bus etc.For ease of representing, in Figure 13, only with a thick line, represent, but do not represent only to have the bus of a bus or a type.
Receiver 91, the first permission sending for receiving station STA sends message, and wherein, first allows to send the sign that message comprises all Basic Service Set BSS that cover STA.
Wherein, BSS sign can be the MAC Address of AP, certainly also can be other signs, as long as can BSS of unique identification.
Processor 92, determines that for send message according to the first permission AP sends the initial time of downlink data, makes the definite initial time of AP and first allow the definite initial time of the AP of other BSS in transmission message identical.
Reflector 94, starts to send downlink data for the initial time definite.
Processor 92 sends message specifically for the first permission receiving according to receiver 91, determine that the BSS that AP is corresponding allows to send the order in message described first, and sequentially determine time to count and waiting time according to this, according to time to count and waiting time, determine initial time.
First, whether processor 92 sends message identification AP corresponding to the promoter who uses down channel according to the first permission; If so, determine that it is time to count that reception first allows the time of transmission message, and determine that according to the first permission transmission message self sends the waiting time of downlink data.Processor 92 sends according to the first permission the waiting time that message determines that AP sends downlink data and is specially, and first, obtains STA and receives the duration T that the first request sends message rTS, obtain STA and send according to the first request the duration T that message sends the first permission transmission message cTS; Then, according to the first permission, send the quantity N of each BSS in message, and the sequence number n of AP in each BSS, based on following formula, determine waiting time:
T'=(N-n)×T+T SIFS
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.
In the present embodiment, processor 92 specifically for, from the first permission, send to resolve message and obtain STA and receive the duration T that the first request sends message rTS, obtain STA and send according to the first request the duration T that message sends the first permission transmission message cTS.
If not, be the non-promoter corresponding to using down channel of AP, processor 92 is controlled reflector 94 and is sent the second request transmission message according to order, and the second permission of returning by receiver 91 receptions sends message, using receiving second, allow the time that sends message as time to count, and send according to the first permission the waiting time that message is determined AP transmission downlink data, wherein, the second request sends message for representing the promoter of the non-use down channel of AP, to indicate second of STA sign transmission to allow to send the non-promoter corresponding to using down channel of message.In the present embodiment, processor 92 sends the second request transmission message according to order and specifically comprises: the sequence number n according to AP in each BSS, calculates and sends required waiting time T'':T''=(the n-2) * T of described the second request transmission information based on following formula; Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving the first request, send the duration of message, T cTSfor send message according to the first request, send the duration that the first permission sends message.
Whether idle processor 92, also for when AP need to send downlink data, identify down channel to be used; If recognize the down channel free time, by reflector 94, to the STA transmission of downlink data to be sent, represent the first request transmission message of the promoter that AP is use down channel, to indicate the first permission that STA sign sends to send message corresponding to the promoter of use down channel.Processor 92 is judgement in the following manner specifically, when described AP need to send downlink data, judges whether to receive that first permission corresponding with down channel to be used sends message; If so, determine that down channel is busy, and according to the first permission, send the estimated time that takies of carrying in message, determine the release time of down channel; If not, determine that down channel is idle.
The AP that the present embodiment provides, can be used for carrying out the embodiment of the present invention one, two is the scheme that embodiment tetra-provides, implementation method and technique effect are similar, repeat no more here.
The structural representation of the STA that Figure 14 provides for the embodiment of the present invention ten, as shown in figure 14, the STA100 that the present embodiment provides comprises:
Receiver 1000, processor 1001, memory 1002 and reflector 1003.Wherein, receiver 1000, memory 1002 and reflector 1003 can be connected with processor 1001 by bus or alternate manner respectively, be connected to example describe in Figure 14 with bus.Wherein, memory 1002 is for stores executable programs code, and this program code comprises computer-managed instruction.The method that the downlink data that the program that processor 1001 is stored in memory 1002 by operation realizes the embodiment of the present invention to be provided sends.Bus can be industry standard architecture (Industry Standard Architecture, referred to as ISA) bus, peripheral component interconnect (Peripheral Component, referred to as PCI) bus or extended industry-standard architecture (Extended Industry Standard Architecture, referred to as EISA) bus etc.Described bus can be divided into address bus, data/address bus, control bus etc.For ease of representing, in Figure 14, only with a thick line, represent, but do not represent only to have the bus of a bus or a type.
The request transmission message that receiver 1000 sends for receiving access point AP.
Processor 1001, allows to send message for send message generation according to request, allows to send the sign of carrying all Basic Service Set BSS that cover site STA in message.
Reflector 1003, send to allow sends message to AP, to indicate AP to determine according to allowing to send message the initial time that sends downlink data, wherein, allows to send the definite initial time of AP that in message, each BSS is corresponding identical.
Receiver 1000 also for, according to definite initial time downlink data receiving.
Processor 1001 specifically for, the sign of AP corresponding to all BSS that cover STA is carried in order and allows to send in message, and the quantity of carrying all BSS, generate and allow to send message.Reflector 1003 sends message for sending this permission.
In the present embodiment, processor 1001 is also for when the STA access network, and during physical location change, scanning covers all BSS of this STA, and the line item of going forward side by side, is saved in memory 1002.
In the present embodiment, whether processor 1001 is also to use the promoter of down channel to send for the identification that sends a request message receiving according to receiver 1000; If so, the sign that covers all BSS of STA is carried at and allows to send in message, and sign allows to send message corresponding to the promoter who uses down channel.If not, sending module is carried at the sign that covers all BSS of STA to allow to send in message, and sign allows to send the non-promoter corresponding to using down channel of message.
The technical scheme that the STA that the present embodiment provides provides for carrying out above-described embodiment three and four, implementation method and technique effect are similar, repeat no more here.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, when carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (26)

1. a downlink data transmission method, is characterized in that, comprising:
The first permission that access point AP receiving station STA sends sends message, and wherein, described first allows to send the sign that message comprises all Basic Service Set BSS that cover described STA;
Described AP allow to send message according to described first and determines that described AP sends the initial time of downlink data, makes the definite initial time of described AP and described first allow the definite initial time of the AP of other BSS in transmission message identical;
Described AP starts to send downlink data in definite initial time.
2. method according to claim 1, is characterized in that, described AP allows to send message according to described first and determines that the initial time of described AP transmission downlink data comprises:
Described AP determines that the BSS of self correspondence allows to send the order in message described first;
Described AP determines time to count and waiting time according to described order, according to described time to count and waiting time, determines described initial time.
3. method according to claim 2, is characterized in that, before receiving the first permission transmission message of STA transmission, also comprises at AP:
When described AP need to send downlink data, whether idlely identify down channel to be used;
If it is idle that described AP recognizes described down channel, to the STA transmission of downlink data to be sent, represent the first request transmission message of the promoter that described AP is the described down channel of use, with first permission of indicating described STA sign to send, send message corresponding to the promoter of the described down channel of use.
4. method according to claim 3, is characterized in that, when described AP need to send downlink data, whether the free time comprises to identify down channel to be used:
When described AP need to send downlink data, judge whether to receive that first permission corresponding with down channel to be used sends message;
If so, determine that described down channel is busy, and send the estimated time that takies of carrying in message according to described the first permission, determine the release time of described down channel;
If not, determine that described down channel is idle.
5. method according to claim 3, is characterized in that, described AP determines that according to described order time to count and waiting time comprise:
Whether described AP allows to send message identification self corresponding to the promoter who uses described down channel according to described first;
If so, definite time that receives described the first permission transmission message of described AP is time to count, and allows transmission message to determine that self sends the waiting time of downlink data according to described first;
If not, described AP sends the second request according to described order and sends message, and the second permission that reception is returned sends message, using receiving described second, allow the time that sends message as time to count, and allow transmission message to determine that self sends the waiting time of downlink data according to described first, wherein, described the second request sends message for representing the promoter of the described down channel of the non-use of described AP, to indicate second of described STA sign transmission to allow to send the non-promoter corresponding to using described down channel of message.
6. method according to claim 5, is characterized in that, described AP allow to send message according to described first and determines that the waiting time that self sends downlink data comprises:
Described AP obtains described STA and receives the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS;
Described AP allows to send the quantity N of each BSS in message according to described first, and from the sequence number n in each BSS, based on following formula, determines waiting time:
T'=(N-n)×T+T SIFS
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.
7. method according to claim 6, is characterized in that, described AP sends the second request transmission packet according to described order and draws together:
Described AP, according to the sequence number n from each BSS, calculates and sends the required waiting time T'' of described the second request transmission information based on following formula:
T''=(n-2)×T；
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving described the first request, send the duration of message, T cTSfor sending message according to described the first request, send the duration that described the first permission sends message.
8. method according to claim 7, is characterized in that, described AP obtains described STA and receives the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTScomprise:
Described AP allows to send message from described first and resolves and obtain the duration T that described STA reception the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS.
9. according to the arbitrary described method of claim 1-8, it is characterized in that: described BSS is designated the MAC Address of AP.
10. a downlink data method of reseptance, is characterized in that, comprising:
Site STA receives the request transmission message that access point AP sends;
Described STA sends message generation according to described request and allows to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover described STA in message, and send described permission transmission message to described AP, to indicate described AP to send message according to described permission, determine the initial time that sends downlink data, wherein, to send the definite initial time of AP that in message, each BSS is corresponding identical for described permission;
Described STA is according to definite initial time downlink data receiving.
11. methods according to claim 10, it is characterized in that, described STA sends message generation according to described request and allows to send message, and described permission sends the sign of carrying all Basic Service Set BSS that cover self in message, and to described AP, sends described permission transmission packet and draw together:
Described STA is carried in order described permission by the sign of AP corresponding to all BSS that cover self and sends in message, and the quantity of carrying all BSS;
Described STA sends described permission and sends message.
12. methods according to claim 10, is characterized in that, also comprise:
Described STA is when access network, and physical location when change, and scanning covers the described all BSS of self, the line item of going forward side by side.
13. according to the arbitrary described method of claim 10-12, it is characterized in that, described STA sends message generation according to described request and allows to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover self in message, and to described AP, sends described permission transmission packet and draw together:
Whether the identification that sends a request message described in described STA basis is to use the promoter of down channel to send;
If so, described STA is carried at the sign that covers all BSS of self to allow to send in message, and identifies described permission transmission message corresponding to the promoter who uses described down channel;
If not, described STA is carried at the sign that covers all BSS of self to allow to send in message, and identifies the non-promoter corresponding to using described down channel of described permission transmission message;
Described in described STA broadcast transmission, allow to send message.
14. 1 kinds of access point AP, is characterized in that, comprising:
Receiver module, the first permission sending for receiving station STA sends message, and wherein, described first allows to send the sign that message comprises all Basic Service Set BSS that cover described STA;
Initial time determination module, determines that for allow sending message according to described first described AP sends the initial time of downlink data, makes the definite initial time of described AP and described first allow the definite initial time of the AP of other BSS in transmission message identical;
Sending module, starts to send downlink data for the initial time definite.
15. AP according to claim 14, is characterized in that, described initial time determination module comprises:
Order determining unit, for determining that the BSS that described AP is corresponding sends the order of message in described the first permission;
Time determining unit, for determining time to count and waiting time according to described order, determines described initial time according to described time to count and waiting time.
16. AP according to claim 15, is characterized in that, also comprise:
Whether idle channel identification module, for when described AP need to send downlink data, identify down channel to be used;
If it is idle that described AP recognizes described down channel, to the STA transmission of downlink data to be sent, represent the first request transmission message of the promoter that described AP is the described down channel of use, with first permission of indicating described STA sign to send, send message corresponding to the promoter of the described down channel of use.
17. AP according to claim 16, is characterized in that, described channel identification module specifically for:
When described AP need to send downlink data, judge whether to receive that first permission corresponding with down channel to be used sends message;
If so, determine that described down channel is busy, and send the estimated time that takies of carrying in message according to described the first permission, determine the release time of described down channel;
If not, determine that described down channel is idle.
18. AP according to claim 16, is characterized in that, described time determining unit specifically for:
According to described first, allow to send message and whether identify described AP corresponding to the promoter who uses described down channel;
If so, definite time that receives described the first permission transmission message is time to count, and allows transmission message to determine that self sends the waiting time of downlink data according to described first;
If not, according to described order, send the second request and send message, and the second permission that reception is returned sends message, using receiving described second, allow the time that sends message as time to count, and allow to send according to described first the waiting time that message is determined described AP transmission downlink data, wherein, described the second request sends message for representing the promoter of the described down channel of the non-use of described AP, to indicate second of described STA sign transmission to allow to send the non-promoter corresponding to using described down channel of message.
19. AP according to claim 18, is characterized in that, described time determining unit allow to send according to described first the waiting time that message determines that described AP sends downlink data and comprises:
Obtain described STA and receive the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS;
According to described the first permission, send the quantity N of each BSS in message, and the sequence number n of described AP in each BSS, based on following formula, determine waiting time:
T'=(N-n)×T+T SIFS
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period.
20. AP according to claim 19, is characterized in that, described time determining unit sends the second request transmission packet according to described order and draws together:
Sequence number n according to described AP in each BSS, calculates and sends the required waiting time T'' of described the second request transmission information based on following formula:
T''=(n-2)×T；
Wherein, T=T cTS+ T rTS+ 2 * T sIFS, T sIFSfor short frame period, T rTSfor receiving described the first request, send the duration of message, T cTSfor sending message according to described the first request, send the duration that described the first permission sends message.
21. AP according to claim 20, is characterized in that, described in obtain described STA and receive the duration T that the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTScomprise:
From described first, allow to send message and resolve and obtain the duration T that described STA reception the first request sends message rTS, obtain described STA and send according to described the first request the duration T that message sends described the first permission transmission message cTS.
22. according to the arbitrary described AP of claim 14-21, it is characterized in that: described BSS is designated the MAC Address of AP.
23. 1 kinds of site STA, is characterized in that, comprising:
Request sends message sink module, the request transmission message sending for receiving access point AP;
Sending module, for send message generation according to described request, allow to send message, described permission sends the sign of carrying all Basic Service Set BSS that cover described site STA in message, and send described permission transmission message to described AP, to indicate described AP to send message according to described permission, determine the initial time that sends downlink data, wherein, to send the definite initial time of the AP of each BSS in message identical for described permission;
Data reception module, for according to definite initial time downlink data receiving.
24. STA according to claim 23, is characterized in that, described sending module comprises:
Information generating unit, is carried in order described permission by the sign of the AP of all BSS of the described STA of covering and sends in message, and the quantity of carrying all BSS;
Information transmitting unit, sends message for sending described permission.
25. STA according to claim 23, is characterized in that, also comprise:
Scan module, for when the described STA access network, and during physical location change, scanning covers all BSS of described STA, the line item of going forward side by side.
26. according to the arbitrary described STA of claim 23-25, it is characterized in that, also comprises:
Message identification module, for sending a request message described in basis, whether identification is to use the promoter of down channel to send;
If so, described sending module is carried at the sign that covers all BSS of described STA to allow to send in message, and identifies described permission transmission message corresponding to the promoter who uses described down channel;
If not, described sending module is carried at the sign that covers all BSS of described STA to allow to send in message, and identifies the non-promoter corresponding to using described down channel of described permission transmission message;
Described sending module sends described permission and sends message.
CN201310133153.9A 2013-04-17 2013-04-17 Downlink data method of sending and receiving and its access point AP and site STA Active CN104113905B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201310133153.9A CN104113905B (en) 2013-04-17 2013-04-17 Downlink data method of sending and receiving and its access point AP and site STA
PCT/CN2013/087408 WO2014169650A1 (en) 2013-04-17 2013-11-19 Downlink data sending and receiving method, access point (ap), and station (sta)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310133153.9A CN104113905B (en) 2013-04-17 2013-04-17 Downlink data method of sending and receiving and its access point AP and site STA

Publications (2)

Publication Number Publication Date
CN104113905A true CN104113905A (en) 2014-10-22
CN104113905B CN104113905B (en) 2017-12-29

Family

ID=51710501

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310133153.9A Active CN104113905B (en) 2013-04-17 2013-04-17 Downlink data method of sending and receiving and its access point AP and site STA

Country Status (2)

Country Link
CN (1) CN104113905B (en)
WO (1) WO2014169650A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016082118A1 (en) * 2014-11-26 2016-06-02 华为技术有限公司 Wireless communication method, equipment and system
WO2016191967A1 (en) * 2015-05-29 2016-12-08 华为技术有限公司 Channel access method and station
CN107027128A (en) * 2016-02-02 2017-08-08 华为技术有限公司 Information transferring method and node
WO2017133336A1 (en) * 2016-02-02 2017-08-10 华为技术有限公司 Information transmission method and node
WO2017206102A1 (en) * 2016-06-01 2017-12-07 华为技术有限公司 Method and device for channel contention
CN108293249A (en) * 2016-03-22 2018-07-17 Oppo广东移动通信有限公司 Method, terminal and base station for sending ascending control information
WO2018188502A1 (en) * 2017-04-11 2018-10-18 Huawei Technologies Co., Ltd. Bss pcp/ap cluster network reference architecture
CN110418401A (en) * 2018-04-27 2019-11-05 慧与发展有限责任合伙企业 Channel dispatch for spatial reuse
WO2021013118A1 (en) * 2019-07-24 2021-01-28 展讯通信（上海）有限公司 Multi-ap operation reverse triggering system and access points
CN114501605A (en) * 2022-01-21 2022-05-13 维沃移动通信有限公司 Communication method, communication device, electronic device and storage medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101282168A (en) * 2007-04-03 2008-10-08 中兴通讯股份有限公司 Transmission method and system for TDD mobile communication system to share time wireless frame
CN101778467A (en) * 2009-01-14 2010-07-14 鼎桥通信技术有限公司 Method for realizing synchronization timing of access point in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system
CN102547961A (en) * 2010-12-10 2012-07-04 华为技术有限公司 Method, device and system for synchronizing base stations
CN102651906A (en) * 2011-02-28 2012-08-29 华为技术有限公司 Communication method, device and base station for WCDMA (Wideband Code Division Multiple Access) system
CN102695264A (en) * 2011-03-25 2012-09-26 北京新岸线无线技术有限公司 Method for realizing time synchronization and wireless communication system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8989111B2 (en) * 2010-07-13 2015-03-24 Mediatek Singapore Pte. Ltd. System and method for coordinating multiple wireless communications devices in a wireless communications network
CN102740430B (en) * 2012-07-17 2015-12-16 宇龙计算机通信科技(深圳)有限公司 Countless according to instruction list signaling time synchronized communication means and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101282168A (en) * 2007-04-03 2008-10-08 中兴通讯股份有限公司 Transmission method and system for TDD mobile communication system to share time wireless frame
CN101778467A (en) * 2009-01-14 2010-07-14 鼎桥通信技术有限公司 Method for realizing synchronization timing of access point in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system
CN102547961A (en) * 2010-12-10 2012-07-04 华为技术有限公司 Method, device and system for synchronizing base stations
CN102651906A (en) * 2011-02-28 2012-08-29 华为技术有限公司 Communication method, device and base station for WCDMA (Wideband Code Division Multiple Access) system
CN102695264A (en) * 2011-03-25 2012-09-26 北京新岸线无线技术有限公司 Method for realizing time synchronization and wireless communication system

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3214877A4 (en) * 2014-11-26 2017-12-13 Huawei Technologies Co. Ltd. Wireless communication method, equipment and system
CN105917712A (en) * 2014-11-26 2016-08-31 华为技术有限公司 Wireless communication method, equipment and system
US10411851B2 (en) 2014-11-26 2019-09-10 Huawei Technologies Co., Ltd. Wireless communication method, device and system
RU2663818C1 (en) * 2014-11-26 2018-08-10 Хуавэй Текнолоджиз Ко., Лтд. Method, device and wireless communication system
WO2016082118A1 (en) * 2014-11-26 2016-06-02 华为技术有限公司 Wireless communication method, equipment and system
WO2016191967A1 (en) * 2015-05-29 2016-12-08 华为技术有限公司 Channel access method and station
CN107027128A (en) * 2016-02-02 2017-08-08 华为技术有限公司 Information transferring method and node
WO2017133336A1 (en) * 2016-02-02 2017-08-10 华为技术有限公司 Information transmission method and node
US10764925B2 (en) 2016-02-02 2020-09-01 Huawei Technologies Co., Ltd. Coordination of wireless nodes for data transmissions in overlapping basic service sets
CN107027128B (en) * 2016-02-02 2019-12-24 华为技术有限公司 Information transmission method and node
CN108293249A (en) * 2016-03-22 2018-07-17 Oppo广东移动通信有限公司 Method, terminal and base station for sending ascending control information
US11219044B2 (en) 2016-03-22 2022-01-04 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for sending uplink control information, terminal, and base station
CN108293249B (en) * 2016-03-22 2021-06-29 Oppo广东移动通信有限公司 Method, terminal and base station for sending uplink control information
WO2017206102A1 (en) * 2016-06-01 2017-12-07 华为技术有限公司 Method and device for channel contention
US10790948B2 (en) 2017-04-11 2020-09-29 Huawei Technologies Co., Ltd. BSS PCP/AP cluster network reference architecture
WO2018188502A1 (en) * 2017-04-11 2018-10-18 Huawei Technologies Co., Ltd. Bss pcp/ap cluster network reference architecture
US11323878B2 (en) 2017-04-11 2022-05-03 Huawei Technologies Co., Ltd. BSS PCP/AP cluster network reference architecture
CN110418401A (en) * 2018-04-27 2019-11-05 慧与发展有限责任合伙企业 Channel dispatch for spatial reuse
US11617204B2 (en) 2018-04-27 2023-03-28 Hewlett Packard Enterprise Development Lp Channel scheduling for spatial reuse
WO2021013118A1 (en) * 2019-07-24 2021-01-28 展讯通信（上海）有限公司 Multi-ap operation reverse triggering system and access points
US11979861B2 (en) 2019-07-24 2024-05-07 Spreadtrum Communications (Shanghai) Co., Ltd. Reverse trigger system of multiple access point operation including common station, initializer AP and first coordinated AP, and access point
CN114501605A (en) * 2022-01-21 2022-05-13 维沃移动通信有限公司 Communication method, communication device, electronic device and storage medium
CN114501605B (en) * 2022-01-21 2024-05-24 维沃移动通信有限公司 Communication method, communication device, electronic equipment and storage medium

Also Published As

Publication number Publication date
WO2014169650A1 (en) 2014-10-23
CN104113905B (en) 2017-12-29

Similar Documents

Publication Publication Date Title
CN104113905A (en) Downlink data transmitting and receiving method, and access point AP and station STA thereof
US11212846B2 (en) Mechanisms for enhanced transmission and reception of physical random access channel
CN104796218B (en) Method for transmitting signals and device
US20200044796A1 (en) Method and apparatus for uplink and downlink transmission alignment
KR20230125228A (en) Random access method and apparatus in wireless communication system
CN106789800B (en) Downlink synchronization method, device and system
US11497008B2 (en) Enhancements on synchronization, random access, and HARQ operation for non-terrestrial networks
TWI771323B (en) Signature sequence for system identification in a shared spectrum
AU2018261298A1 (en) Method for transmitting and receiving random access channel, and device for same
TWI434578B (en) Apparatus and method for co-existence between different radio access technologies
CN104968052A (en) Configuring method, configuring system, apparatus, receiving method, receiving system, and terminal
CN105592467A (en) Method and equipment for competing channel resource in long term evolution communication system
CN112564868B (en) Signal sending and receiving method and terminal
CN110971281B (en) Beam scanning method, beam configuration method, terminal and network equipment
EP3425990A1 (en) Enhanced prach scheme for power savings, range improvement and improved detection
US20230397263A1 (en) Methods and devices for uplink signal transmission
CN112312479A (en) Uplink signal sending method and user equipment
CN105308891B (en) A kind of device and method of determining secondary carrier transmission direction
EP3235309B1 (en) Time synchronization of stations
US20240007242A1 (en) Methods and apparatus for selecting a beam reference signal in a wireless communication system
CN107294671B (en) Method and device for sending random access subframe
CN112956136B (en) Beam pattern switching for positioning reference signal measurements
CN113973261A (en) Positioning processing method, device and equipment
CN113973333A (en) Channel measurement processing method, device and equipment
CN107113275A (en) A kind of data transmission method, device and system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20210427

Address after: Unit 3401, unit a, building 6, Shenye Zhongcheng, No. 8089, Hongli West Road, Donghai community, Xiangmihu street, Futian District, Shenzhen, Guangdong 518040

Patentee after: Honor Device Co.,Ltd.

Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen

Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd.