CN103404065B - For the method and apparatus providing the multiple re-transmission policy for individual traffic - Google Patents

Abstract

One feature provide can at the access point communicated with destination station the method for operation, wherein, this access point receives the data stream including at least one media access control protocol data cell (MPDU), and described MPDU has differentiated services code points (DSCP) field value；The re-transmission policy for described MPDU is provided based on this dscp field value；And send described MPDU by WLAN to described destination station.Described data stream can include the video data stream with hierarchical modulation scheme, and wherein, described dscp field value identifies at least one layer of this hierarchical modulation scheme.Described access point can use deep packet detection to obtain this DSCP value from MPDU.Using this mode, the multiple re-transmission policy for individual traffic can be provided by dscp field value being mapped to MPDU bit field (such as task identifier field).

Description

For the method and apparatus providing the multiple re-transmission policy for individual traffic

Technical field

Putting it briefly, a feature relates to communication system, more particularly, it relates to the difference being directed in individual traffic Media access control protocol data cell (MPDU), it is provided that the method for multiple re-transmission policy.

Background technology

The availability day by day increased of WLAN (WLAN) has allowed such as desktop computer, calculating on knee The station of machine, handheld personal (PDA) and mobile phone etc is by such as LAN (LAN) and the Internet etc It is connected to each other, to transmit data in-between various network wireless.Such as, user can be by its laptop computer from its book Table takes meeting room to and participates in meeting, and still accesses its local network to obtain data, and is not being carried out by wired connection In the case of mooring, access the Internet via one or more modems or the gateway provided on local network.

WLAN can be made up of four major parts.These parts can include stand (STA), access point (AP), wireless Jie Matter and dissemination system.Setting up network to transmit data between stations, wherein said station can include having radio network interface Calculating equipment.Such as, laptop computer, desktop computer, mobile phone and there is other electronics of radio network interface Equipment is the example at the station in network.Access point is to allow station be connected to each other and transmit the equipment of data.The example bag of access point Include router, centerized fusion device, base station, " node B " or site controller.

Data are via packet, are sent by WLAN.Packet comprises control information and payload information (such as, number According to)；The form of packet changes according to communication protocol.Stand it can be desirable to via one or more access points, to separately on WLAN The content of multimedia of such as video etc is transmitted at one station.Typically, video traffic is mapped to single levels of priority, its meaning All frames that taste in this video flowing are stood on the WLAN link between (receiving the station of this video data) at access point and destination To have identical re-transmission policy.But, some frame of video may comprise information more prior than other frame of video, therefore with tool The frame having prior information is compared, and can abandon the frame with less important information because of less importance.

Such as, in some content delivering systems, it is possible to achieve hierarchical modulation scheme (it is also known as hierarchical modulation scheme), With the video content that delivery quality or resolution are different.These schemes are all often before being transmitted by multiple data stream/bit streams It is modulated into a single symbol stream or bit stream (it includes base layer bitstream/symbol and enhancement layer bit-stream/symbol).Enhancement layer Use and permit improving the video content quality at reception equipment and/or resolution.First base layer bitstream can include multiple In-frame encoding picture frame (I frame) and prediction picture frame (P frame).First enhancement layer bit-stream includes multiple bidirectional predictive picture frame (B Frame).In this scenario, relevant with I frame and P frame data are more crucial than the data relevant with B frame.Additionally, other content distribution System can also have multiple attribute so that some frame data is more crucial than other frame data.

Accordingly, it would be desirable to in data stream (such as, there is the video and/or audio data stream of hierarchical modulation scheme) not Same Frame, it is provided that the method for multiple re-transmission policy, wherein this data stream has the single priority water between access point and station Band chain road.

Summary of the invention

One feature provide can at the access point communicated with destination station the method for operation, wherein the method includes: Reception includes the data stream of at least one media access control protocol data cell (MPDU), and described MPDU has differential service generation Code-point (DSCP) field value；Based on described dscp field value, it is provided that for the re-transmission policy of described MPDU；And by wireless office Territory net (WLAN) sends described MPDU to described destination station.In one embodiment, described data stream packets includes and has layering tune The video data stream of scheme processed, the described dscp field value of wherein said MPDU identifies at least one of described hierarchical modulation scheme Layer.In another embodiment, described re-transmission policy identifies the maximum retransmission that described MPDU stands to described destination.

In one embodiment, described method also includes: perform deep packet detection to obtain described in described MPDU Dscp field value, and the described re-transmission policy for described MPDU is provided.In another embodiment, described method is also wrapped Include: according to access category value, the transmission standing described MPDU to described destination carries out priority division, wherein said access class Not value is the IP precedence part of described dscp field value based on described MPDU.In another embodiment, described method is also Including: the non-IP precedence part of described dscp field value based on described MPDU, it is provided that for the described re-transmission of described MPDU Strategy.In another embodiment, described method also comprises determining that the described dscp field value of described MPDU is class selector generation Code-point value；Described class selector code point value is construed to values of user-priority；It is associated according to described values of user-priority Access category, the transmission standing described MPDU to described destination carries out priority division；And institute of based on described MPDU State the IP precedence part of dscp field value, it is provided that for the re-transmission policy of described MPDU.

In another embodiment, described method also comprises determining that the described dscp field value of described MPDU is the choosing of non-class Select symbol code point value；According to access category value, the transmission standing described MPDU to described destination carries out priority division, described Access category value selects based on described non-class selector code point value；And based on described non-class selector code point value, Described re-transmission policy for described MPDU is provided.In another embodiment, the method also comprises determining that the institute of described MPDU Stating dscp field value is non-class selector code point value；It is user priority by the IP precedence partial interpretation of described dscp field value Level value；According to the access category being associated with described values of user-priority, the transmission stood described MPDU to described destination is entered Row major level divides；And the non-IP precedence part of described dscp field value of based on described MPDU, it is provided that for described The described re-transmission policy of MPDU.

In another embodiment, described MPDU includes the first task identifier (TID) field value, and described method is also Including: the described first TID field value of described MPDU, wherein said second TID field is substituted/rewrites with the second TID field value Value is based on described dscp field value.In another embodiment, described 2nd TID value determines the re-transmission plan of described MPDU Slightly.In another embodiment, between standing at described access point and described destination, disable Hybrid Coordination Function and control channel When accessing (HCCA), described second TID field value has the value between eight (8) and ten five (15).In another embodiment, institute State dscp field value to be associated with Internet, and described MPDU is associated with data link layer.In another embodiment, institute Stating dscp field value is defined in the payload portions of described MPDU.In another embodiment, based on described DSCP Field value provides the described re-transmission policy for described MPDU to define based on each MPDU.

Accompanying drawing explanation

Fig. 1 shows according to an embodiment, and source station is expected that by one or more access point and sends number to destination station According to an example of WLAN (WLAN) environment.

Fig. 2 shows according to an embodiment, if having an example of open system interconnection (OSI) model of dried layer.

Fig. 3 shows according to an embodiment, has the IP packet of Internet Protocol (IP) header and IP payload One example.

Fig. 4 shows according to an embodiment, including medium access control (MAC) header and the medium access of MAC afterbody Control protocol data cell (MPDU), wherein the payload of MPDU is served as in IP packet.

Fig. 5 shows according to an embodiment, can include the bit field of MAC header, and wherein this MAC header includes frame Control field, MAC Address field, sequence control field and service quality (QoS) field.

Fig. 6 shows the table according to an embodiment, the table show the enhanced distributed channel with channel access and connects Enter task identifier (TID) sub-field value that User Priority (UP) value in (EDCA) method is corresponding, and connect with channel The Hybrid Coordination Function entered controls the TID sub-field value that the traffic stream identifier identifier value in channel access (HCCA) method is corresponding.

Fig. 7 shows according to an embodiment, task identifier sub-field value and with access classes based on various priority The mapping of not corresponding values of user-priority.

Fig. 8 shows according to an embodiment, between the transmitter and receiver, and re-transmission policy, TID value and DSCP value Part mapping.

Fig. 9 shows according to an embodiment, TID sub-field value and corresponding with access categories based on various priority Values of user-priority substitute map an example.

Figure 10 shows according to an embodiment, with values of user-priority together with the corresponding difference of the access category being associated The mapping of the IP precedence value of sub-service business code point (DSCP) field.

Figure 11 shows according to an embodiment, with values of user-priority together with the corresponding class of the access category being associated The mapping of selector code point value.

Figure 12 shows according to an embodiment, non-class selector code point value, access category value and distribute to/weigh Write the part mapping between the TID value of MPDU.

Figure 13 is to illustrate according to an embodiment, can operate for the data stream being sent to receiving station at access point The flow chart of the exemplary method of multiple re-transmission policy is provided.

Figure 14 is to illustrate according to an embodiment, can operate for the data stream being sent to receiving station at access point The flow chart of the exemplary method of multiple re-transmission policy is provided.

Figure 15 is to illustrate according to an embodiment, can operate for the data stream being sent to receiving station at access point The flow chart of the exemplary method of multiple re-transmission policy is provided.

Figure 16 is to illustrate according to an embodiment, can operate for the data stream being sent to receiving station at access point The flow chart of the exemplary method of multiple re-transmission policy is provided.

Figure 17 is to illustrate according to an embodiment, can operate for the data stream being sent to receiving station at access point The flow chart of the exemplary method of multiple re-transmission policy is provided.

Figure 18 shows the functional block diagram of the access point according to an embodiment.

Figure 19 shows the functional block diagram of the source STA according to an embodiment.

Figure 20 shows the functional block diagram of the destination STA according to an embodiment.

Detailed description of the invention

In the following description, detail is given to provide a thorough understanding of embodiments.But, the common skill in this area Art personnel are not it should be appreciated that can use these details to realize these embodiments.Such as, show in form of a block diagram Go out circuit, in order to do not make these embodiments obscure in unnecessary details.In other example, it is not illustrated in detail in known Circuit, structure and technology, in order to do not make these embodiments obscure.

General introduction

There is shown herein permission for data stream (such as, video and/or the sound including being sent to receiver from transmitter Frequency data stream) the technology of multiple re-transmission policy of different media access control protocol data cells (MPDU).Such as, one Feature provide can at the access point communicated with destination station by WLAN the method for operation, wherein: this access point Reception includes that (this MPDU has differential service code for the data stream of at least one media access control protocol data cell (MPDU) Point (DSCP) field value)；The re-transmission policy for this MPDU is provided based on dscp field value；And should to destination's station transmission MPDU.This data stream can include the video data stream with hierarchical modulation scheme, wherein, described point of this dscp field value mark At least one layer of layer modulation scheme.This access point can use deep packet detection to come from MPDU and obtain DSCP value.Use this Mode, can come for list by dscp field value is mapped to MPDU bit field (such as task identifier (TID) field) Individual data stream provides multiple re-transmission policy.

Example network environment

Fig. 1 shows exemplary WLAN environment 100, wherein, source STA 102 be expected that by one or more access point 104, 106 send data to destination STA 108.In this example, source STA 102 wishes finally to send to destination STA such as to regard Frequently Frame, but in other embodiments, the data sent can have any type.Source STA 102 can be by wireless Connect and communicate to the first access point 104.Oneth AP 104 transfers to be carried out to the 2nd AP 106 by wired or wireless connection Communication.2nd AP 106 transfers to be communicated with destination STA 108 by wireless connections.In certain embodiments, source STA 102 and/or destination STA 108 can alternatively have and the wired connection of access point 104,106, or in addition, also There are wireless connections.In other embodiments, can exist between source STA 102 and destination STA 108 one or more Access point.

Most of cordless communication networks including WLAN can be broken down into different parts, in order to helps to make network Internal work and structuring concept.Such as, Open Systems Interconnection (osi model) is that communication system is subdivided into referred to as layer A kind of mode of smaller portions.One " layer " is to its serve upper layers and from conceptive being similar to of its lower floor reception service The set of function.On each layer, an example provides service to the example being positioned at upper strata, and from lower floor's request service.Can To realize be used for for include from source STA 102 be sent to destination given herein with conceptualization in this scheme The different MPDU of the data stream of STA 108 provides the embodiment of multiple re-transmission policy.

Fig. 2 shows an example of osi model 200, by scope from " the highest " (that is, conceptive close to user) Seven layers to " end " (fabric less obvious i.e., for a user) show this example.Osi model can wrap Include the application layer 202 being positioned at top, be followed by representing layer 204, session layer 206, transport layer 208, Internet 210, data link Layer 212 and physical layer 214.

As shown in Figure 3, in Internet 210, the video data frame sent from source STA 102 can be configured to the Internet Agreement (IP) is grouped 300.IP packet 300 can include IP header 302 and payload 304.Payload 304 comprises video counts According to, this video data includes that source STA 102 expectation is sent to a part of data stream of destination STA 108.Except other side, IP header 302 includes 6 bit differentiated services code points (DSCP) fields 306, and dscp field 306 is for Internet 210 The type of the data sent is classified.

(such as voice or video divide to crucial Network packet type can to use differential service (DiffServ) Group) low time delay, guaranteed service are provided, provide simple to non-critical services (such as Email or file transmit) simultaneously Best-Effort service ensures.For example, it is possible to be categorized into having the packet that DSCP value is 52 there is " fast-forwarding " behavior, thus To send these packets with low latency and low jitter, it is suitable for voice or video.Comparatively speaking, DSCP value is 15 can to have There is a higher packet loss, and be given the priority more relatively low than having packet that value is 52.

Furthermore, it is possible to DSCP code value to be divided into two classes: class selector code point and non-class selector code point.Class is selected Select the DSCP value between symbol code point and 0-7 corresponding, the most only use first three least significant bit of 6 bit dscp fields 306. Non-class selector code point is corresponding with DSCP value 8-63, and it can use all 6 bits.Dscp field 306 " IP is preferential Level " the most corresponding with the three of dscp field 306 least significant bits.As it is used herein, " the non-IP of dscp field 306 Priority " the most corresponding with the three of dscp field 306 highest significant positions.

In data link layer 212, IP packet 300 can be encapsulated as media access control protocol data cell further Or media access control service data cell (MSDU) (MPDU).Fig. 4 shows and includes MAC header 402 and MAC afterbody 404 MPDU 400, the payload that wherein MPDU 400 is served as in IP packet 300.Therefore, except other side, effective load of MPDU Pocket includes IP header 302 and IP payload 304, and wherein IP header 302 includes that dscp field 306 is worth.Fig. 5 shows that MAC reports 402 some fields that can include, wherein, these field bags: frame control field 502, MAC Address field 504, sequential control Field 506 and service quality (QoS) field 508.Qos field 508 can include task identifier (TID) field 510.Order control Field 506 processed comprises 12 bit sequence number fields, the serial number of the MPDU 400 that the instruction of this sequence number field is distributed by dispatching station. Then, the MPDU received can be reordered by receiving station based on these serial numbers.

Seeing the table 600 shown in Fig. 6, TID field 510 is 4 bit fields, and its intermediate value 0-7 mark is for connecing at channel The enhanced distributed channel that enters accesses and gives the User Priority that the priority of MPDU 400 carries out classifying in (EDCA) method (UP) value.When the access point 104,106 in WLAN 100 supports that Hybrid Coordination Function controls channel access (HCCA), traditionally Value within range 8-16.Therefore, if WLAN 100 does not support HCCA, the most not TID of use value 8-15, and And the priority giving MPDU is classified by WLAN 100 based on values of user-priority.The rank of the priority in EDCA is referred to as Access category (AC), and mapping 700 shown in the figure 7 show the relation between values of user-priority and AC.Therefore, The UP of 4 and 5 is converted into the AC (AC_VI) of video content, and the UP of 6 and 7 is converted into the AC (AC_VO) of voice content.

QoS STA/AP be (being specified by address 1 field 504) each unique receiver, each TID value maintain one with 4096 is the serial order counter of mould.Use the enumerator identified by the TID son field 510 of QoS control field 508, be The QoS data frame allocation order number of such as MPDU 400 etc, and for belonging to each MPDU of this TID value, by this meter Number device is incremented by 1.

Typically, it is sent to the video data stream of destination STA 108 from source STA 102 and may include that substantially have The MPDU stream of single TID values of user-priority (such as, 5).Therefore, do not consider the relative importance of any one specific MPDU, This video data stream can have with for from sender (such as, source STA 102 and/or the such as the 2nd AP 106) to reception Each MPDU's 400 that machine (such as, AP the 104, the 2nd AP 106 and/or destination STA 108) sends is identical Re-transmission policy.This is that the block generally using each TID value to be configured due to 802.11n equipment confirms (ACK) re-transmission policy.Cause This, all MPDU sent with identical TID are able to be transmitted according to identical block ACK strategy, and do not have difference.

But, owing to some MPDU may be associated with frame of video (such as, " I frame "), thus these MPDU than with less Other MPDU that important frame of video (such as " B frame ") is associated is more important, and therefore source STA 102 is it can be desirable to for difference MPDU, set up different re-transmission policies.Such as, source STA 102 is it can be desirable to for the MPDU being associated with I frame, it is achieved tool There is the block Ack retrying re-transmission policy 10 times, and for the MPDU being associated with B frame, it is achieved without Ack re-transmission policy.But, logical Often, source STA 102 and/or access point 106 are it can be desirable to appointing within the data stream being sent to destination STA 108 neatly The re-transmission policy that what MPDU distribution is different.In one embodiment, it can be assumed that I frame and B frame are at different MPDU and/or IP Carry among packet.But, in certain embodiments, it is not necessary to each MPDU and/or IP packet carries one utterly Individual I frame or B frame, or each MPDU and/or IP packet carries I frame or the B frame of integral multiple.I frame and B frame can be by parts Be included in any one MPDU and/or IP packet among.

Therefore, except other side, this allows for including the data stream that sends from transmitter to receiver for disclosing The embodiment of the multiple re-transmission policy of the different MPDU of (such as, video and/or audio data stream).In certain embodiments, Transmitter can be source STA the 102, the oneth AP 104 and/or the 2nd AP 106.In certain embodiments, receiver can be One AP the 104, the 2nd AP 106 and/or destination STA 108.

In one embodiment, source STA 102 expectation uses EDCA or HCCA, sends video to destination STA 108 And/or voice data stream.Source STA 102 can distribute two TID field 510 to each MPDU 400 including this data stream In value (TID 4 or TID 5) one.TID value 4 and 5 is corresponding with values of user-priority 4 and 5 respectively, as shown in Figure 7, Corresponding with these values and to be associated with the access category of these values be AC_VI.Therefore, in this embodiment, at MPDU 400 TID 510 be worth and distribute to there is man-to-man fixed relationship between User Priority and the access category of MPDU 400.

It is then possible to distribute different values by the dscp field 306 in IP header 302, realize for each The multiple re-transmission policy of MPDU 400.As discussed herein, differential service (DiffServ) is a kind of computer network architecture, It specifies the mechanism being used for that Network is classified and provided the quality of service guarantee in IP network.In order to be grouped classification Purpose, DiffServ uses 6 bit dscp fields 306 in IP header 302.Additionally, in one embodiment, DSCP value is permissible It is used to specify different re-transmission policies by transmitter and receiver.Transmitter and receiver can exchange appointment in advance for each The map information of the specific retransmission strategy of individual DSCP value.Additionally, this map information can each according in the MAC header of MPDU Individual TID value, specifies specific re-transmission policy for each the DSCP value in IP header.

Therefore, source STA 102 and/or generate the application program of this data stream and can operate the DSCP of each MPDU 400 Field 306 value and TID field 510 are worth, based on the mapping relations preset between transmitter and receiver, to select for this The specific retransmission strategy of MPDU 400.Similarly, receiver can read the dscp field of each MPDU 400 received 306 values (such as, detected by deep packet) and TID field 510 are worth, and correspondingly process the re-transmission policy of MPDU 400.

Fig. 8 shows according to an embodiment, between the transmitter and receiver, and re-transmission policy and TID value and DSCP value A this part mapping 800.Such as, the combination of DSCP value 23 and TID 4 can be specified and be had 2 times and retry re-transmission policy Block Ack, and the combination of DSCP value 23 and TID 5 can be specified and be had the block Ack retrying re-transmission policy 5 times, etc..Each 0- DSCP value within 63 can specify different re-transmission policies from the combination of TID value 4 and 5.In other embodiments, each 0- DSCP value within 63 can specify different re-transmission policies from the combination of TID value 0-7.Therefore, based on DSCP value, send STA Determine that it will at most send the number of times that (re-transmission) carries the MPDU 400 of this packet.In certain embodiments, multiple DSCP values can To be mapped to same TID, but transmitter internally can decide whether certain MPDU 400 carries out weight based on DSCP value Pass.Therefore, in certain embodiments, the maximum times of re-transmission can be changed according to TID value.

In another embodiment, source STA 102 expectation uses EDCA to send video and/or sound to destination STA 108 Frequency data stream.Source STA 102 distributes the TID value between 0-15 to each MPDU including this data stream.But, in this enforcement In example, TID field 510 value of MPDU 400 need not have with the priority being given MPDU 400 by receiver (such as, AP 104) Close.In other words, distribute to TID field 510 TID value (User Priority 0-7 or TSID 8-15) can with by receiver to The actual access category giving MPDU 400 is unrelated.Therefore, this embodiment has vetoed the fixing EDCA mapping shown in Fig. 7.When In the case of not using HCCA, this embodiment also uses TID value 8-15, and otherwise these values are Untapped.Therefore, in one embodiment, each TID value can have fixing confirmation re-transmission policy, but due to permissible Based on different DSCP values, by multiple TID, video flowing is split, the difference therefore when being sent by WLAN, in video flowing Layer will receive different confirmation strategies.

Fig. 9 shows that the TID 510 given at receiver (such as, AP 104) place is worth between priority and access category The example of mapping 900 of replacement.Such as, TID 510 value of 12 can represent that values of user-priority is 5 and connects practically Enter classification AC_VI.It is worth owing to re-transmission policy can be directly bound to the TID field 510 of MPDU 400, therefore source STA 102 There are at least 16 different re-transmission policies now distribute to given MPDU 400, meanwhile maintain and give this MPDU's Desired priority.In certain embodiments, it is also possible to by combining the mapping scheme of this replacement, the dscp field of MPDU is used The value of 306 represents unique re-transmission policy (it is similar to above with reference to the concept described by Fig. 8), significantly increases available Quantity in the re-transmission policy of given MPDU.

Generally, use the enumerator identified by the TID son field 510 of QoS control field 508, distribute MPDU 400 Sequence control field 506 in serial number, and for belonging to each MPDU 400 of this TID value, this enumerator is passed Increase 1.Therefore, three continuous N PDU in a stream with identical TID value should have continuous print serial number, and has in a stream Three the continuous print MPDU having different TID value can have serial number discontinuous, incoherent.

But, in some of the embodiments described herein, can come to these independent of distributing to the TID value of MPDU MPDU allocation order number.Therefore, three continuous N PDU in a stream can have continuous print serial number, even if they have not Same TID value.It is suitable that the access category mapped can being actually pointed to based on TID value rather than TID value itself distribute these Sequence number.For example, use the mapping of the replacement shown in Fig. 9, among a stream, be respectively provided with three of TID value 5,13 and 15 Continuous N PDU can have continuous print serial number, and this is owing to they are mapped to access category AC_IV.

Map owing to this embodiment has deviated from traditional EDCA, use mapping all of this replacement the most in a wlan Equipment (such as, source STA the 102, the oneth AP the 104, the 2nd AP 106 and/or destination STA 108) must use this replacement Mapping scheme before, there is the knowledge of the mapping scheme of this replacement in advance.Therefore, it should between the transmitter and receiver (such as, between source STA 102 and an AP 104 and/or between the 2nd AP 106 and destination STA 108) transmits and is somebody's turn to do The negotiation mapping relevant information substituted.In one embodiment, can be during initiating message, from source STA 102 to connecing Receipts machine sends the mapping scheme of this replacement.In another embodiment, AP 104 can pass through association response frame, by wide for this mapping Broadcast to source STA 102.

In another embodiment, source STA 102 expectation use EDCA to destination STA 108 send video and/or Voice data stream.In this embodiment, in chain, the last access point of destination STA 108 it is wirelessly linked to (such as, in Fig. 1 The 2nd AP 106) use the dscp field 306 of its MPDU 400 received to be worth, cover the TID of existing MPDU 400 Value 510.This embodiment is without requiring other access point (that is, the oneth AP 104) tool being positioned in the chain before the 2nd AP 106 The knowledge in advance that the access category having any replacement maps.

Such as, if data stream is video flowing, then can be to each MPDU including this data stream at source STA 102 The TID value of 400 distribution such as 4 or 5.In one embodiment, this data stream can be the video flowing with hierarchical modulation scheme. The application generating this data stream can be based on concrete video coding layer (such as, I frame, P frame or the B frame belonging to MPDU Deng), distribute concrete dscp field 306 to this MPDU and be worth.Using this mode, this dscp field 306 can last by this chain Access point (such as, AP 106) can be used to the TID value in the last transmission going to destination STA 108 is heavily joined Put.

In one embodiment, first include the MPDU 400 of this data stream to AP 104 transmission from source STA 102. MPDU 400 is entered by the oneth AP 104 according to by the priority set by this TID value (such as, value 4 or 5) and re-transmission policy Row processes, and retransmits this data stream to correspondingly the 2nd AP 106.

It follows that this MPDU 400 data stream can be sent from the 2nd AP 106 to destination STA 108.Noticeable It is not use TID field 510 value of the MPDU 400 during going to the transmission of destination STA 108 to determine for purpose The priority treatment of the MPDU 400 of any other transmission outside ground STA 108, this is owing to destination STA 108 is this The terminal of transmission.Therefore, the TID field 510 being mainly used in the MPDU 400 during going to the transmission of destination STA 108 is worth Determine that the serial number of MPDU 400 reorders and re-transmission policy.Therefore, the 2nd AP 106 can freely rewrite and cover this The TID field 510 of a little MPDU is worth, and this is the follow-up purpose outside will not being retransmitted to destination STA 108 due to these MPDU Ground.

In one example, the 2nd AP 106 is preferential from IP precedence part and the non-IP of dscp field 306 value based on it The value that level part reads, rewrites TID field 510 and is worth.As discussed previously, IP precedence part is 6 bit dscp fields Three least significant bits of 306, rather than IP precedence part is three highest significant positions of 6 bit dscp fields 306.2nd AP Included in the IP precedence part of 106 dscp fields 306 based on the given MPDU 400 being transferred to destination STA 108 Value (such as, based on the mapping 1000 shown in Figure 10), this MPDU 400 is carried out priority division.Therefore, the 2nd AP 106 by being values of user-priority by the IP precedence partial interpretation of DSCP value 306, to being transferred to destination STA's 108 MPDU 400 carries out priority division.This values of user-priority is associated with the such as access category value shown in Figure 10,.

2nd AP 106 also uses the value included in the non-IP precedence part of dscp field 306 to rewrite MPDU 400 TID field 510 be worth.Therefore, it now is possible to change the re-transmission plan of MPDU 400 according to the value rewritten to TID field 510 value Slightly, this is to be worth owing to the re-transmission policy of MPDU 400 can being linked to TID field 510.Destination STA 108 is based on by new Serial order counter determined by TID field 510 value, reorders to the MPDU 400 received.In one embodiment, may be used To cross over by each video coding layer determined by DSCP value, MPDU/ packet is reordered.

In the above example, the 2nd AP 106 it is rewritten to the value of TID field 510 and distributes to the access of MPDU 400 Classification will originate from being generated, by video data based on layering, the dscp field 306 that the application of these IP packet initially selects Value.In one embodiment, this application may reside among source STA 102, such as, be positioned at the memorizer electricity at source STA 102 Among road, and this application can be performed by the process circuit of source STA 102.In other embodiments, another equipment base Video data in layering generates IP packet.

In another example, the 2nd AP 106 dscp field based on MPDU 400 306 value is to comprise class selector generation Code-point value still comprises non-class selector code point value, rewrites TID field 510 and is worth.Select if dscp field 306 comprises class Symbol code point value (that is, the value between 0-7), then the 2nd AP 106 is by being construed to values of user-priority by dscp field 306, base In this value, the MPDU 400 being transferred to destination STA 108 is carried out priority division.This values of user-priority with such as Figure 11 Shown in mapping 1100 shown in access category corresponding.Additionally, the 2nd AP 106 can use dscp field 306 Value included in IP precedence part, the TID field 510 rewriteeing MPDU 400 is worth.It is rewritten to the TID field of MPDU 400 The TID value of 510 may indicate that the re-transmission policy of this specific MPDU 400, and which serial order counter will be used this MPDU 400 reorders.

Comparatively speaking, if dscp field 306 comprises non-class selector code point value (that is, the value between 8-63), then This MPDU 400 can be entered by two AP 106 according to any preselected mapping managed by this non-class selector code point value Row major level divides and rewrites TID field 510 and is worth.Such as, Figure 12 show non-class selector code point value, access category value and Distribute/be rewritten to this part mapping 1200 between the TID value of MPDU 400.It is rewritten to the TID field 510 of MPDU 400 TID value may indicate that the re-transmission policy of this specific MPDU 400, and which serial order counter will be used this MPDU 400 reorder.It is therefoie, for example, the non-class selector code point value of 13 can make the 2nd AP 106 use value 5, (value 5 is corresponding In having the re-transmission policy that the block retrying trial confirms 2 times) rewrite TID field 510 and be worth.Come always according to access category AC_VI The priority of MPDU 400 is distributed in management.A part mapping 1200 simply example shown in Figure 12.Can be used it In various non-class selector code point values any preselected mapping relations corresponding from different priority and re-transmission policy.

In another example, the 2nd AP 106 dscp field based on MPDU 400 306 value is to comprise class selector generation Code-point value still comprises non-class selector code point value, rewrites TID field 510 and is worth.Select if dscp field 306 comprises class Symbol code point value (that is, the value between 0-7), then the 2nd AP 106 is by being construed to values of user-priority by dscp field 306, base In this value, the MPDU 400 being transferred to destination STA 108 is carried out priority division.This values of user-priority with such as Figure 11 Shown in mapping 1100 shown in access category corresponding.Additionally, the 2nd AP 106 can use dscp field 306 Value included in IP precedence part, the TID field 510 rewriteeing MPDU 400 is worth.It is rewritten to the TID field of MPDU 400 The TID value of 510 may indicate that the re-transmission policy of this specific MPDU 400, and which serial order counter will be used this MPDU 400 reorders.

Comparatively speaking, if dscp field 306 comprises non-class selector code point value (that is, the value between 8-63), then The value that two AP 106 can read from IP precedence part and the non-IP precedence part of dscp field 306 value based on it, weighs The TID field 510 writing MPDU 400 is worth.Value included in 2nd AP 106 IP precedence based on dscp field 306 part, To be transferred to destination STA 108 given MPDU 400 carry out priority division, such as, such as the mapping 1000 of Figure 10 Shown in.Therefore, the 2nd AP 106, by being values of user-priority by the IP precedence partial interpretation of DSCP value 306, comes biography The MPDU 400 being passed to destination STA 108 carries out priority division.Values of user-priority and the such as access shown in Figure 10 Class label is associated.2nd AP 106 uses the value included in the non-IP precedence part of dscp field 306, rewrites MPDU The TID field 510 of 400 is worth.Therefore, it now is possible to change the re-transmission of MPDU 400 according to the value being rewritten to TID field 510 value Strategy, this is to be worth owing to the re-transmission policy of MPDU 400 can being linked to TID field 510.Destination STA 108 is based on by newly Serial order counter determined by TID field 510 value, reorders to the MPDU 400 received.In one embodiment, may be used To cross over by each video coding layer determined by DSCP value, MPDU/ packet is reordered.

Figure 13 is to illustrate to operate at access point (such as, the 2nd AP 106) place, for providing for being sent to receiving station The flow chart of the exemplary method of the multiple re-transmission policy of the data stream of (such as destination STA 108).In step 1302, this access Point receives and includes the data stream of at least one MPDU 400, and wherein MPDU 400 has dscp field 306 and is worth.This data stream is permissible It is to receive from access point (a such as AP 104 or source STA 102) formerly.In step 1304, access point 106 based on Dscp field 306 is worth, it is provided that for the re-transmission policy of MPDU 400.Such as, this can be performed by following operation: uses deep Degree detection of packets obtains dscp field 306 and is worth；And use new TID field 510 to be worth (such as, the second TID field 510 is worth) weight Writing/substitute original TID field 510 to be worth (such as, the first TID field value), wherein new TID field 510 value is at least part of ground Being worth in dscp field 306, the second TID field 510 value determines the re-transmission policy of this MPDU 400.In step 1306, access point 106 According to the re-transmission policy of dscp field 306 value being based at least partially on MPDU 400, send this MPDU to destination STA 108 400。

Figure 14 is to illustrate to operate at access point (such as, the 2nd AP 106) place, for providing for being sent to receiving station The flow chart of the exemplary method of the multiple re-transmission policy of the data stream of (such as destination STA 108).In step 1402, this access Point receives and includes the data stream of at least one MPDU 400, and wherein MPDU 400 has dscp field 306 and is worth.This data stream is permissible It is to receive from access point (a such as AP 104 or source STA 102) formerly.In step 1404, access point 106 based on The non-IP precedence part of dscp field 306 value of MPDU 400, it is provided that for the re-transmission policy of this MPDU 400.Such as, this Can be performed by following operation: use deep packet detection to obtain dscp field 306 and be worth；And use new TID field 510 values (such as, the second TID field 510 is worth) rewrite/substitute original TID field 510 and are worth (such as, the first TID field value), its In new TID field 510 value be at least partially based on the non-IP precedence part of dscp field 306 value.Second TID field 510 Value determines the re-transmission policy of this MPDU 400.In step 1406, access point 106 is according to access category value, to MPDU 400 to mesh The transmission at station, ground 108 carry out priority division, wherein this access category value is dscp field 306 value based on MPDU 400 IP precedence part.In step 1408, access point 106 is according to the non-IP precedence being based at least partially on dscp field 306 value The re-transmission policy of part, sends this MPDU 400 to destination STA 108.

Figure 15 is to illustrate to operate at access point (such as, the 2nd AP 106) place, for providing for being sent to receiving station The flow chart of the exemplary method of the multiple re-transmission policy of the data stream of (such as destination STA 108).In step 1502, this access Point receives and includes the data stream of at least one MPDU 400, and wherein MPDU 400 has dscp field 306 and is worth.This data stream is permissible It is to receive from access point (a such as AP 104 or source STA 102) formerly.In step 1504, access point 106 determines The dscp field value of this MPDU is class selector code point value, and in step 1506, access point 106 is by such selector code point value It is construed to values of user-priority.In step 1508, the IP precedence of access point 106 dscp field based on MPDU 400 306 value Part, it is provided that for the re-transmission policy of this MPDU 400.Such as, this can be performed by following operation: uses deep packet Detection obtains dscp field 306 and is worth；And use new TID field 510 to be worth (such as, the second TID field 510 is worth) to rewrite/replace Being worth (such as, the first TID field value) for original TID field 510, wherein new TID field 510 value is at least partially based on DSCP The IP precedence part of field 306 value.Second TID field 510 value determines the re-transmission policy of this MPDU 400.In step 1510, Access point 106 according to the access category being associated with this values of user-priority, MPDU 400 to destination is stood 108 transmission enter Row major level divides.In step 1512, access point 106 is according to dscp field 306 value being based at least partially on MPDU 400 The re-transmission policy of IP precedence part, sends this MPDU 400 to destination STA 108.

Figure 16 is to illustrate to operate at access point (such as, the 2nd AP 106) place, for providing for being sent to receiving station The flow chart of the exemplary method of the multiple re-transmission policy of the data stream of (such as destination STA 108).In step 1602, this access Point receives and includes the data stream of at least one MPDU 400, and wherein MPDU 400 has dscp field 306 and is worth.This data stream is permissible It is to receive from access point (a such as AP 104 or source STA 102) formerly.In step 1604, access point 106 determines The dscp field value of this MPDU is non-class selector code point value.In step 1606, it is non-that access point 106 is based at least partially on this Class selector code point value, it is provided that for the re-transmission policy of this MPDU 400.This can be performed by following operation: uses deep Degree detection of packets obtains dscp field 306 and is worth；And use new TID field 510 to be worth (such as, the second TID field 510 is worth) weight Writing/substitute original TID field 510 to be worth (such as, the first TID field value), wherein new TID field 510 value is at least part of ground In this non-class selector code point value.Second TID field 510 value determines the re-transmission policy of this MPDU 400.In step 1608, connect Access point 106 according to access category value, MPDU 400 to destination is stood 108 transmission carry out priority division, wherein this access Class label selects based on described non-class selector code point value.In step 1610, access point 106 is according at least part of ground In the re-transmission policy of described non-class selector code point value, send this MPDU 400 to destination STA 108.

Figure 17 is to illustrate to operate at access point (such as, the 2nd AP 106) place, for providing for being sent to receiving station The flow chart of the exemplary method of the multiple re-transmission policy of the data stream of (such as destination STA 108).In step 1702, this access Point receives and includes the data stream of at least one MPDU 400, and wherein MPDU 400 has dscp field 306 and is worth.This data stream is permissible It is to receive from access point (a such as AP 104 or source STA 102) formerly.In step 1704, access point 106 determines Dscp field 306 value of this MPDU is non-class selector code point value, and in step 1706, access point 106 is by this DSCP word The IP precedence partial interpretation of section 306 values is values of user-priority.In step 1708, access point 106 DSCP based on this MPDU The non-IP precedence part of field 306 value, it is provided that for the re-transmission policy of this MPDU 400.Such as, this can pass through following behaviour Make to perform: use deep packet detection to obtain dscp field 306 and be worth；And use new TID field 510 to be worth (such as, second TID field 510 is worth) rewrite/substitute original TID field 510 and be worth (such as, the first TID field value), wherein new TID field 510 is worth It is at least partially based on the non-IP precedence part of dscp field 306 value of MPDU 400.Second TID field 510 value determines The re-transmission policy of this MPDU 400.In step 1710, access point 106 is according to the access class being associated with this values of user-priority , MPDU 400 to destination is not stood 108 transmission carry out priority division.In step 1712, access point 106 is according at least portion Divide the re-transmission policy of the non-IP precedence part of ground dscp field 306 based on MPDU 400 value, send to destination STA 108 This MPDU 400.

In certain embodiments, when disabling HCCA between access point 106 and destination STA 108, the second TID field 510 values can have the value between 8 and 15.Therefore, the second TID field 510 can use usually HCCA use to be retained Value, and enable EDCA between this access point and destination STA 108.In other embodiments, the number received at access point 106 The video and/or audio data stream with hierarchical modulation scheme, and the dscp field 306 value mark of MPDU 400 is included according to stream At least one layer of the hierarchical modulation scheme that this MPDU 400 is associated.

Exemplary access point

Figure 18 shows the functional block diagram of the second access point 106 according to an embodiment.Second access point 106 can wrap Include process circuit 1802 (such as, processor, processing module etc.), memory circuitry 1804 (such as, memorizer, memory module Deng) and communication interface 1806, all these parts can be communicatively coupled with one another.Communication interface 1806 can also include allow with WLAN 100, other access point (such as, access point 104), source STA 102 and/or destination STA 108 carry out wireless and/or At least one transmitter 1808 and at least one receiver 1810 of wire communication.

Process circuit 1802 to be configured to data are processed.Specifically, this process circuit be adapted for carrying out at least with Any one in lower step: the step 1302 shown in Figure 13,1304 and 1306；Step 1402 shown in Figure 14,1404, 1406 and 1408；Step 1502 shown in Figure 15,1504,1506,1508,1510 and 1512；Step shown in Figure 16 1602,1604,1606,1608 and 1610；And/or the step 1702 shown in Figure 17,1704,1706,1708,1710 and 1712.Such as, MPDU 400 stream that this process circuit is applicable to having specific dscp field 306 value processes, wherein This dscp field 306 value indicates particular video frequency coding layer (such as, I frame, P frame or B frame etc.) that this MPDU 400 is associated. Use this mode, before transmitting MPDU 400 data stream to destination STA 108, DSCP word can be used by processing circuit 1802 Section 306 reconfigures TID field 510 and is worth.

Memory circuitry 1804 is configured to store data, comprising: the dscp field 306 obtained from the MPDU of data stream Value and the corresponding mapping, re-transmission policy and the access category/priority value that substitute between TID field 510 value.Such as, Memory circuitry 1804 can store and map those mapping classes described in 700,800,900,1000,1100 and 1200 As map.Memory circuitry 1804 is additionally configured to store data stream, and this data stream packets includes the video with hierarchical modulation scheme And/or voice data stream.Communication interface 1806 is configured that and receives and send the data for other network (WLAN) assembly, all As reception and transmission include the data stream of at least one MPDU (it has dscp field value).First access point 104 can have Perform the identical construction unit of the function identical with the second access point 106.

Exemplary source station

Figure 19 shows the functional block diagram of the source STA 102 according to an embodiment.Source STA 102 can include processing electricity Road 1902 (such as, processor, processing module etc.), memory circuitry 1904 (such as, memorizer, memory module etc.) and communicate Interface 1906, all these parts can be communicatively coupled with one another.Communication interface 1906 can also include allow with WLAN 100, AP 104,106 and/or destination STA 108 carries out wireless and/or at least one transmitter 1908 and at least one of wire communication Individual receiver 1910.

Process circuit 1902 to be configured to process and/or generate the video and/or audio number including having hierarchical modulation scheme Data stream according to stream.Memory circuitry 1904 be configured to store data, comprising: have hierarchical modulation scheme video and/or Voice data stream.Additionally, memory circuitry 1904 be also configured as storage application/instruction, wherein when this application/instruction by When reason device 1904 performs, generation has the MPDU 400 of specific dscp field 306 value and flows, wherein this specific dscp field 306 values indicate particular video frequency coding layer (such as, I frame, P frame or B frame etc.) that this MPDU 400 is associated.With this side Formula, can be used dscp field 306 by last access point (such as, AP 106) in chain, to going to destination STA's TID field 510 value of the MPDU 400 in final transmission reconfigures.Communication interface 1906 is configured that to other WLAN 100 assemblies (including AP the 104, the 2nd AP 106 and/or destination STA 108) receive and send data, such as receive and Transmission includes the data stream of at least one MPDU (it has dscp field value).

Station, exemplary purpose ground

Figure 20 shows the functional block diagram of the destination STA 108 according to an embodiment.Destination STA 108 can wrap Include process circuit 2002 (such as, processor, processing module etc.), memory circuitry 2004 (such as, memorizer, memory module Deng) and communication interface 2006, all these parts can be communicatively coupled with one another.Communication interface 2006 can also include allow with WLAN 100, AP 104,106 and/or source STA 102 carry out wireless and/or at least one transmitter 2008 and of wire communication At least one receiver 2010.

Process circuit 2002 to be configured to process and/or generate the video and/or audio number including having hierarchical modulation scheme Data stream according to stream.It is additionally configured to additionally, process circuit 2002: receive and process there is specific dscp field 306 value MPDU 400, wherein this specific dscp field 306 value indicates the particular video frequency coding layer (example that this MPDU 400 is associated As, I frame, P frame or B frame etc.).Memory circuitry 2004 is configured to store data, comprising: have regarding of hierarchical modulation scheme Frequency and/or voice data stream.There is specific dscp field 306 it is worth additionally, memory circuitry 2004 is also configured as storage MPDU 400 flow, wherein this specific dscp field 306 value indicate this MPDU 400 be associated particular video frequency coding layer (such as, I frame, P frame or B frame etc.).Using this mode, destination STA 108 (via communication interface 2006) receives, (in storage In device circuit 2004) storage and (use process circuit 2002) process at least one including having new TID field 510 value The data stream of MPDU 400, and the new re-transmission policy of dscp field based on MPDU 400 306 value.Communication interface 2006 configures For: receive to other WLAN 100 assembly (including AP the 104, the 2nd AP 106 and/or destination STA 108) and send Data, such as receive and transmission includes the data stream of at least one MPDU (it has dscp field value).

Can be by shown in Fig. 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 and/or 20 Assembly, step, feature and/or function in one or more carrying out rearrange and/or be combined to single component, a step Suddenly, in feature or function, or realize in several assemblies, step or function.Additionally, on the basis of without departing from the present invention, Other module, assembly, step and/or function can also be increased.Device shown in Fig. 1,18,19 and/or 20, equipment And/or assembly, can be configured in method, feature or the step described in execution Figure 13,14,15,16 and/or 17 Individual or multiple.Device, equipment and/or assembly shown in Fig. 1,18,19 and/or 20, can be configurable to generate, receive And/or use table described in Fig. 3,4,5,6,7,8,9,10,11,12,13,14,15,16 and/or 17, mapping relations or MPDU/ packet in one or more.Algorithm described herein can also realize efficiently at software and/or be embedded into hard In part.

Additionally, it should be noted that flow chart, flow chart, structure chart or block diagram can be used as mistake using embodiment Journey is described.Although using flow chart to describe the operations as into a sequential process, but a lot of operation can be parallel Or perform simultaneously.And it is possible to adjust the order of these operations.At the end of these operate, processing procedure also just terminates.Place Reason process can correspond to method, function, process, subroutine, subprogram etc..When a process corresponds to a function, this process The termination of process is corresponding to calling the return of function or principal function from this function to it.

Additionally, storage medium can be expressed as the one or more equipment for storing data, it includes read only memory (ROM), random access memory (RAM), magnetic disk storage medium, optical storage media, flash memory device and/or for storing information Other machine readable media, processor readable medium and/or computer-readable medium.Term " machine readable media ", " computer Computer-readable recording medium " and/or " processor readable medium " non-transitory medium can be included but not limited to, such as, portable or fixing Storage device, light storage device and various can store, comprise or carry instruction and/or other medium of data.Therefore, this Shen Various methods described by please can be fully or partly with being stored in " machine readable media ", " computer-readable medium " And/or instruction and/or the data in " processor readable medium " realize, and by one or more processors, machine and/or set For performing.

Furthermore, it is possible to realize embodiment by hardware, software, firmware, middleware, microcode or its combination in any.When making When realizing by software, firmware, middleware or microcode, can the program code or code segment that perform necessary task be stored in all In the machine readable media of storage medium or other memorizer etc.These necessary tasks are performed by processor.Can use Journey, function, subprogram, program, routine, subroutine, module, software kit, class or instruction, data structure or program The combination in any of statement represents code segment.Can be by transmission and/or the information of reception, data, independent variable, parameter or memorizer Content, is connected to another code segment or hardware circuit by code segment.Can by any applicable by the way of, including internal memory share, Information, independent variable, parameter, data etc. are transmitted, forward or are sent by message transmission, alternative space and network transmission etc..

For performing the general processor of herein described function, digital signal processor (DSP), special IC (ASIC), field programmable gate array (FPGA) or other PLD, discrete gate or transistor logic, point Vertical hardware component or its combination in any, can be used to realize or perform combining the various examples that example disclosed herein describes Box, module, circuit, element and/or the assembly of property.General processor can be microprocessor, or, this processor also may be used To be the processor of any routine, controller, microcontroller or state machine.Processor can also be embodied as the group of computation module Close, such as, DSP and the combination of the combination of microprocessor, some microprocessors, one or more microprocessor and DSP core, or Person's other this kind of structure any.

In conjunction with example disclosed herein describe method or algorithm can use processing unit, programmed instruction or other The form of instruction, is embodied directly in hardware, the processor software module performed or a combination of both, these methods or algorithm May be embodied in individual equipment, it is also possible to be distributed among multiple equipment.Software module may be located at RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, depositor, hard disk, portable hard drive, CD-ROM or known in the art Other form any storage medium in.A kind of storage medium can be connected to processor, thus enable the processor to From this read information, and information can be write to this storage medium.Or, storage medium can also be processor Ingredient.

Those of ordinary skill in the art are it should also be appreciated that combine the various exemplary of embodiment disclosed herein description Box, module, circuit and algorithm steps all can be implemented as electronic hardware, computer software or combination.In order to clearly Chu ground represents this interchangeability between hardware and software, above to various exemplary parts, frame, module, circuit and step Suddenly all overall description has been carried out around its function.It is implemented as hardware as this function and is also implemented as software, depend on spy Fixed application and the design constraint that whole system is applied.

On the basis of without departing from protection scope of the present invention, can realize described herein in different systems The various features of the present invention.It should be noted that, what the above embodiments were merely exemplary, it should not be constructed as this Bright restriction.The description of these embodiments is intended to illustrative rather than limits the scope of the invention.Equally, this Bright content can be readily applied to other type of device, and for the person of ordinary skill of the art, various changes Change, amendment and modification will be apparent from.

Claims (29)

1. can at the access point communicated with destination station a method for operation, described method includes:

Receiving the data stream including at least one media access control protocol data cell MPDU, described MPDU has differential service Code point dscp field value, wherein, described data stream has hierarchical modulation scheme, the described dscp field value mark of described MPDU At least one layer of described hierarchical modulation scheme；

Based on described dscp field value, provide pin by substituting the first TID field value with the second task identifier TID field value Re-transmission policy to described MPDU, wherein, described re-transmission policy identifies the maximum re-transmission time that described MPDU stands to described destination Number；And

Described MPDU is sent to described destination station by WLAN (WLAN).

Method the most according to claim 1, wherein, described data stream packets includes the video data with hierarchical modulation scheme Stream.

Method the most according to claim 1, wherein, described maximum retransmission becomes based on described second TID field value Change.

Method the most according to claim 1, also includes:

Perform the deep packet detection described dscp field value with the described MPDU of acquisition, and provide for described in described MPDU Re-transmission policy.

Method the most according to claim 1, also includes:

According to access category value, the transmission standing described MPDU to described destination carries out priority division, described access category It is worth the IP precedence part of described dscp field value based on described MPDU.

Method the most according to claim 1, also includes:

The non-IP precedence part of described dscp field value based on described MPDU, it is provided that for the described re-transmission plan of described MPDU Slightly.

Method the most according to claim 1, also includes:

The described dscp field value determining described MPDU is class selector code point value；

Described class selector code point value is construed to values of user-priority；

According to the access category being associated with described values of user-priority, the transmission standing described MPDU to described destination is carried out Priority divides；And

The IP precedence part of described dscp field value based on described MPDU, it is provided that for the re-transmission policy of described MPDU.

Method the most according to claim 1, also includes:

The described dscp field value determining described MPDU is non-class selector code point value；

According to access category value, the transmission standing described MPDU to described destination carries out priority division, described access category Value selects based on described non-class selector code point value；And

Based on described non-class selector code point value, it is provided that for the described re-transmission policy of described MPDU.

Method the most according to claim 1, also includes:

The described dscp field value determining described MPDU is non-class selector code point value；

It is values of user-priority by the IP precedence partial interpretation of described dscp field value；

According to the access category being associated with described values of user-priority, the transmission standing described MPDU to described destination is carried out Priority divides；And

The non-IP precedence part of described dscp field value based on described MPDU, it is provided that for the described re-transmission plan of described MPDU Slightly.

Method the most according to claim 1, wherein, described MPDU includes described first TID field value, and wherein institute State the second TID field value based on described dscp field value.

11. methods according to claim 10, wherein, described second TID field value determines the described re-transmission of described MPDU Strategy.

12. methods according to claim 11, wherein, disabling mixing between standing at described access point and described destination When coordination function controls channel access (HCCA), described second TID field value has the value between eight (8) and ten five (15).

13. methods according to claim 1, wherein, described dscp field value is associated with Internet, and described MPDU It is associated with data link layer.

14. methods according to claim 1, wherein, described dscp field value is the payload portions at described MPDU Defined in.

15. methods according to claim 1, wherein, provide the institute for described MPDU based on described dscp field value State re-transmission policy to define based on each MPDU.

16. 1 kinds of access points communicated with destination station, described access point includes:

Wireless communication interface, it is operable to communicate with WLAN；And

Processing circuit, it is coupled to described wireless communication interface and is applicable to:

Receiving the data stream including at least one media access control protocol data cell MPDU, described MPDU has differential service Code point dscp field value, wherein, described data stream has hierarchical modulation scheme, the described dscp field value mark of described MPDU At least one layer of described hierarchical modulation scheme；

Based on described dscp field value, provide pin by substituting the first TID field value with the second task identifier TID field value Re-transmission policy to described MPDU, wherein, described re-transmission policy identifies the maximum re-transmission time that described MPDU stands to described destination Number；And

Described MPDU is sent to described destination station by WLAN (WLAN).

17. access points according to claim 16, wherein, described data stream packets includes the video counts with hierarchical modulation scheme According to stream.

18. access points according to claim 16, wherein, described process circuit applies also for:

Perform the deep packet detection described dscp field value with the described MPDU of acquisition, and provide for described in described MPDU Re-transmission policy.

19. access points according to claim 16, wherein, described process circuit applies also for:

According to access category value, the transmission standing described MPDU to described destination carries out priority division, described access category It is worth the IP precedence part of described dscp field value based on described MPDU；

The non-IP precedence part of described dscp field value based on described MPDU, it is provided that for the described re-transmission plan of described MPDU Slightly.

20. access points according to claim 16, wherein, described process circuit applies also for:

The described dscp field value determining described MPDU is class selector code point value；

Described class selector code point value is construed to values of user-priority；

According to the access category being associated with described values of user-priority, the transmission standing described MPDU to described destination is carried out Priority divides；And

The IP precedence part of described dscp field value based on described MPDU, it is provided that for the described re-transmission plan of described MPDU Slightly.

21. access points according to claim 16, wherein, described process circuit applies also for:

The described dscp field value determining described MPDU is non-class selector code point value；

According to access category value, the transmission standing described MPDU to described destination carries out priority division, described access category Value selects based on described non-class selector code point value；And

Based on described non-class selector code point value, it is provided that for the described re-transmission policy of described MPDU.

22. access points according to claim 16, wherein, described process circuit applies also for:

The described dscp field value determining described MPDU is non-class selector code point value；

It is values of user-priority by the IP precedence partial interpretation of described dscp field value；

According to the access category being associated with described values of user-priority, the transmission standing described MPDU to described destination is carried out Priority divides；And

The non-IP precedence part of described dscp field value based on described MPDU, it is provided that for the described re-transmission plan of described MPDU Slightly.

23. 1 kinds of access points communicated with destination station, described access point includes:

For receiving the module of the data stream including at least one media access control protocol data cell MPDU, described MPDU has Having differentiated services code points dscp field value, wherein, described data stream has hierarchical modulation scheme, the described DSCP of described MPDU Field value identifies at least one layer of described hierarchical modulation scheme；

For based on described dscp field value, carrying by substituting the first TID field value with the second task identifier TID field value For the module of the re-transmission policy for described MPDU, wherein, described re-transmission policy identifies what described MPDU stood to described destination Maximum retransmission；And

For being sent the module of described MPDU to described destination station by WLAN (WLAN).

24. access points according to claim 23, wherein, described data stream packets includes the video counts with hierarchical modulation scheme According to stream.

25. access points according to claim 23, also include:

For performing the deep packet detection described dscp field value with the described MPDU of acquisition, and provide for described MPDU's The module of described re-transmission policy.

26. access points according to claim 23, also include:

For according to access category value, the transmission standing described MPDU to described destination carries out the module of priority division, institute State the IP precedence part of access category value described dscp field value based on described MPDU；

Non-IP precedence part for described dscp field value based on described MPDU, it is provided that described heavy for described MPDU Pass the module of strategy.

27. access points according to claim 23, also include:

For determining that the described dscp field value of described MPDU is the module of class selector code point value；

For described class selector code point value being construed to the module of values of user-priority；

For according to the access category being associated with described values of user-priority, the transmission that described MPDU is stood to described destination Carry out the module of priority division；And

IP precedence part for described dscp field value based on described MPDU, it is provided that for the described re-transmission of described MPDU The module of strategy.

28. access points according to claim 23, also include:

For determining that the described dscp field value of described MPDU is the module of non-class selector code point value；

For according to access category value, the transmission standing described MPDU to described destination carries out the module of priority division, institute State access category value to select based on described non-class selector code point value；And

For based on described non-class selector code point value, it is provided that for the module of the described re-transmission policy of described MPDU.

29. access points according to claim 23, also include:

For determining that the described dscp field value of described MPDU is the module of non-class selector code point value；

For by the module that IP precedence partial interpretation is values of user-priority of described dscp field value；

For according to the access category being associated with described values of user-priority, the transmission that described MPDU is stood to described destination Carry out the module of priority division；And

Non-IP precedence part for described dscp field value based on described MPDU, it is provided that described heavy for described MPDU Pass the module of strategy.