WO2012130092A1

WO2012130092A1 - Method and device for use in frame acknowledgement

Info

Publication number: WO2012130092A1
Application number: PCT/CN2012/072888
Authority: WO
Inventors: 鲍东山; 周玉宝; 姚惠娟; 于晓燕; 刘慎发; 解晓强; 阎德升; 杨之佐
Original assignee: 北京新岸线无线技术有限公司
Priority date: 2011-03-31
Filing date: 2012-03-23
Publication date: 2012-10-04

Abstract

Provided in the present invention are a method and device for use in frame acknowledgement. The method comprises: packaging an acknowledgement response of one or multiple frames into a group acknowledgement response; and transmitting the group acknowledgment response. The method reduces transmission resources occupied by the frame acknowledgement, and effectively ensures the successful transmission of data.

Description

Method and device for frame confirmation

The application date is March 31, 2011, and the application number is 201110081288.6. The invention name is the priority of the prior application of a wireless communication method, and the application date is May 19, 2011, and the application number is 201110130194.3. The title of the invention is the priority of a prior application of a communication system, and the application is July 6, 2011, the application number is 201110189230.3, and the invention name is a priority of the prior application of a method and apparatus for retransmission. The right, and the filing date is February 8, 2012, the application number is 201210027848.4, the invention name is the priority of a prior application for a method and apparatus for frame confirmation, and the filing date is March 2, 2012. The application number is 201210053090.1, the name of the invention is the priority of a prior application for a method and apparatus for frame acknowledgment, the entire contents of which are hereby incorporated by reference.

TECHNICAL FIELD The present invention relates to the field of wireless communications, and in particular, to a method and apparatus for frame acknowledgment.

Background technique

In recent years, wireless network technology has 802.11-based wireless LAN WiFi technology, 802.15-based Bluetooth Blu-etooth system, and Femto technology for indoor applications from mobile communication systems.

WiFi technology based on IEEE 802.11 is one of the most widely used wireless network transmission technologies today. It is mainly used in wireless office i or network environments. The application scenarios are mostly indoors and can also be applied to outdoor environments. The 802.11 system evolved from the original 802.11 b based on the C D M A transmission mechanism to 802.11 a and 802.11 g based on OFDM technology. Although in the latest IEEE 802.11 n-2009 standard, the 802.11 η physical layer peak rate can reach 600 Mbps by introducing multi-antenna (MIMO) technology, but usually the media access control (MAC, Media ACess Control) layer is only capable of vomiting. Up to 300Mbps. Therefore, for traditional WLAN systems, the MAC layer design based on CSMA/CA (Carrier Sense/Collision Avoidance) for single-user access has been the bottleneck of network performance. Therefore, although the existing Wi-Fi technology provides users with a low-cost user access mode to a certain extent, it is difficult to adapt to the current and future rapid development of high-speed multimedia service requirements.

Femto technology based on 3GPP standard is a new technology for indoor coverage evolved from mobile communication systems. Femto technology based on 3G system uses CDMA transmission mechanism, and Femto technology for LTE or WiMAX system uses OFDM transmission mechanism. . Its multiple access mechanism allocates mutually orthogonal access resources for different users by time, frequency and codeword, which is fundamentally different from the competitive CSMA/CA random multiple access. But Femto technology is moved by The 3G/LTE/WiMAX system of the mobile communication system is derived. Since the 3G/LTE/WiMAX system is mainly for wide-area coverage mobile communication scenarios, its system features are not optimized for short- and medium-range wireless communication scenarios. At the same time, based on the complicated upper layer protocol design of 3G/LTE/WiMAX and the strict requirements of PHY layer synchronization, the equipment cost can not be as low as 802.11, which is one of the important reasons why Femto technology has not been widely used. . In order to meet the needs of the increasingly rapidly developing multimedia service applications, in order to better meet the needs of wireless communication, it is necessary to propose a more suitable implementation solution.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method and apparatus for frame confirmation, thereby effectively ensuring successful data transmission. In order to solve the above technical problem, the present invention provides a method for frame acknowledgment, including: The present invention provides a method for frame acknowledgment, including:

Encapsulating the acknowledgement response of one or more frames into a group acknowledgement response;

Send the group confirmation response. The invention also provides an apparatus for frame confirmation, comprising:

An encapsulating module, configured to encapsulate an acknowledgement response of one or more frames into a group acknowledgement response; and a sending module, configured to send the group acknowledgement response. The invention also provides a method for frame confirmation, comprising:

Generating a group confirmation request, where the group confirmation request carries an identifier of one or more service flows and an identifier of a frame that needs to be confirmed on each service flow;

Send the group confirmation request. The invention also provides an apparatus for frame confirmation, comprising:

An encapsulating module, configured to generate a group acknowledgment request, where the group acknowledgment request carries an identifier of one or more service flows and an identifier of a frame that needs to be confirmed on each service flow;

a sending module, configured to send the group confirmation request. The invention provides a method and device for frame confirmation, which can provide a response mode for ensuring successful data transmission, and can effectively save transmission resources. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a flowchart of a method for frame confirmation according to a first embodiment of the present invention;

2 is a schematic diagram of a group acknowledgment frame format according to a first embodiment of the present invention; FIG. 3 is a schematic diagram of an ACK frame format according to a second embodiment of the present invention;

4 is a flowchart of a method for retransmission according to a third embodiment of the present invention; FIG. 5 is a schematic diagram of a G-MPDU format according to a third embodiment of the present invention;

6 is a schematic diagram of a G-MPDU subframe format according to a third embodiment of the present invention; FIG. 7 is a flowchart of a method for retransmission according to a fourth embodiment of the present invention;

8 is a schematic diagram of a group confirmation request frame format according to a fourth embodiment of the present invention; FIG. 9 is a block diagram of an apparatus for frame confirmation according to a fifth embodiment of the present invention;

Figure 10 is a block diagram of an apparatus for frame acknowledgment in accordance with a sixth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description and the annexed drawings are intended to illustrate Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can vary. Portions and features of some embodiments may be included or substituted for parts and features of other embodiments. The scope of the embodiments of the invention includes the full scope of the claims, and all equivalents of the claims. These embodiments of the invention may be referred to herein, individually or collectively, by the term "invention", merely for convenience, and if more than one invention is disclosed, it is not intended to automatically limit the application. The scope is any single invention or inventive concept.

First embodiment

Embodiments of the present invention provide a method for frame confirmation, which is applicable to both a management frame and a data frame. After the sender sends the frame, the receiver returns an acknowledgment response to inform the sender whether the data is successfully received, so that the data transmission success can be effectively monitored.

Referring to FIG. 1, the figure illustrates a frame acknowledgment method according to an embodiment of the present invention, including the following steps: Step S101: Encapsulating an acknowledgment response of one or more frames into a group acknowledgment response (GroupAck); wherein the acknowledgement response of the frame is used to indicate the reception status of the frame, including received and not received.

Step S102: Send the group confirmation response. The embodiment of the invention provides a group acknowledgment response mode, which encapsulates the acknowledgment responses of multiple frames into the same frame and sends out the acknowledgment mode. The same frame header parameter only needs to be transmitted once, which effectively saves Transmission resources; In addition, when transmitting on a physical channel, a frame (group acknowledgment) synchronization can be performed to obtain responses of multiple frames, thereby effectively saving physical transmission resources.

The wireless communication system supports a variety of services, and the transmission of data is transmitted according to the service flow. By type, traffic can be divided into management traffic and data traffic. The management service flow is composed of one or more management frames, and the data service flow is composed of one or more data frames. It is also possible to divide the data traffic flow into more flows according to the specific service type, such as traffic flow 1 (represented by FID1), service flow 2 (represented by FID2), and service flow n (represented by FIDn). Therefore, step S101 may further include (not shown):

Step S1011: Encapsulating an acknowledgement response of one or more frames on the same service flow as a service flow acknowledgement response;

Step S1012: Encapsulate one or more service flow acknowledgement responses into a group acknowledgement response. And identifying, by the encapsulating group, an identifier of the one or more service flows, and an identifier of the one or more frames on the service flows, so that the receiving end identifies that the received group acknowledgement response is A confirmation of which frames on which traffic flow.

Preferably, the embodiment of the present invention proposes to sequentially carry the acknowledgement response of each frame on the service flow by each bit in a bitmap. The acknowledgment response of the corresponding frame is identified by the sequence number of the frame corresponding to the bit in the bitmap. The receiving end determines, according to the sequence number of the frame corresponding to the bit in the bitmap, which frame is carried in the bit, and determines the content of the acknowledgement of the frame identified by the bit number according to the value of the bit.

Preferably, when responding to a plurality of consecutive frames on the traffic stream, the frame of the specific frame in the consecutive frames, for example, the sequence number of the frame corresponding to the first bit in the bitmap, and the length of the bitmap may be used to identify the service. An acknowledgment response of consecutive frames on the stream, each bit in the bitmap corresponds to an acknowledgment response of one frame. Preferably, the length of the bitmap is not fixed, and the number of responses of the returned frame is very flexible, which further improves resource utilization.

Preferably, the fragmentation indication information may also be set to indicate whether the corresponding bitmap carries an acknowledgement response of the fragmented frame or an unacknowledged frame acknowledgement response. That is, the embodiment of the present invention supports the acknowledgment response to the unfragmented frame, and also supports the acknowledgment response to the fragmented frame, and can also mix the acknowledgment response of the frame of the feedback fragment and the acknowledgment response of the unfragmented frame. For example, carrying in a group confirmation response '

FIDO and FID1 acknowledge the response, the frame on FIDO is the unfragmented frame, and the frame on FID1 is the fragmented frame. Then, the acknowledgement response of the unfragmented frame on FIDO is indicated by bitmapO, and the FID is indicated by bitmap 1. A confirmation response of the fragmented frame on 1. For another example, the acknowledgment response of FIDO and FID 1 is carried in the group acknowledgment response, the frame on the FIDO includes the unfragmented frame and the fragmented frame, and the frame on the FID1 is the unfragmented frame, and the FIDO is indicated by the bitmapO. The acknowledgment response of the unfragmented frame indicates that the acknowledgment response of the fragmented frame on FIDO is indicated by bitmap 1, and the acknowledgment response of the unfragmented frame on FID 1 is indicated by bitmap2. For a more intuitive description, the embodiment of the present invention further provides a format of a specific group confirmation frame, as shown in FIG. 2. The group confirmation frame shown in FIG. 2 includes a frame header, a frame body, and frame calibration information (FCS). The frame header contains frame control information, such as a frame type (management frame or data frame), a subtype (specific management frame type, or a specific data frame type), version information, etc.; the frame body contains one or more FID information. Block, the FID information block includes a service flow identifier, a sequence number, and a bitmap, where the bitmap is used to carry an acknowledgment response of consecutive frames, and each bit of the bitmap+ is acknowledgment response of one frame, the sequence number A sequence number indicating a frame corresponding to the first bit in the bitmap.

Preferably, each FID information block is set according to the length of the bitmap; the length of the bitmap is not fixed.

Preferably, a length field of the bitmap is further set in the FID information block to indicate the length of the bitmap.

Preferably, the fragmentation indication information is further set in the FID information block to indicate that the bitmap carries an acknowledgement response of the fragmented frame, or an acknowledgement response of the unfragmented frame.

Preferably, a management control frame acknowledge bit is further set in the frame body for confirming receipt of a no-sequence number management control frame.

Preferably, a length field may be set in the frame body for indicating the total byte length of all fields between the length field and the FCS field, i.e., indicating the sum of the lengths of all FID information blocks. Refer to Table 1 for the definition of each parameter in the frame body.

Table 1 Field Length (bits) Description Reserved 3, the default setting is 0.

1 Indicates that a no-serial management control frame has been received for confirmation. Length 12 represents the total byte length of all fields between the length field and the FCS field.

FID 4 informs the sender that the FID information block is for a certain FID service. The flow is confirmed by the GroupAck.

The SSN 12 notifies the sender of the start sequence number of the Bitmap of the FID block.

Bitmap 4 indicates the length of the Bitmap for each FID block. Length

0: 8 bits;

1 : 16 bits;

2: 32 bits;

3: 64 bits;

4: 128 bits;

5: 256 bits;

6-15: Reserved. Reserve 3, the default setting is 0.

Whether or not 1 is 1, the indication is confirmation of the fragmented data frame. At this point, each bit in the slice Bitmap is a slice for a frame to confirm.

A 0 indicates that the acknowledgment is for the unfragmented data frame. At this point, each bit in the Bitmap is acknowledged for a certain frame.

A bit in Bitmap 8/16/32/Bitmap indicates whether an MPDU or fragment is successfully received. Successful reception is set to 1. Otherwise, 64/128/256 is set to 0. The MPDU sequence number or fragment number is based on SSN and offset. The amount is calculated.

The acknowledgement response of the frame is used to indicate the reception status of the frame, including received and not received si

The trigger timing of the return frame acknowledgement response in the embodiment of the present invention will be described below:

1. Confirm immediately:

Method 1: Return to the confirmation frame immediately after receiving the immediate confirmation request. The immediate confirmation request may be a request frame format agreed by both parties. Preferably, the immediate confirmation request may be a group confirmation request, carrying an identifier of one or more service flows, and an identifier of one or more frames on each service flow, to indicate that the finger on the specified service flow is immediately returned. A confirmation response for the frame. Immediately after receiving the group acknowledgment request, it returns an acknowledgment response for the specified frame on the specified data stream.

The immediate confirmation request may also be an indication bit agreed by both parties. For example, a field in the contracted data frame is an immediate confirmation indicator. When the data frame is parsed, if the immediate confirmation indication is parsed from the data frame, the confirmation frame is immediately returned. Preferably, the immediate confirmation indication is set to be carried in a frame header of the data frame. In the embodiment of the present invention, the confirmation frame is immediately returned, and is returned in the next time period. In the embodiment of the present invention, the central access point (CAP) and the station (STA) may be the transmitting end and the receiving end of each other. The CAP is an entity that provides access services for the visited STAs; the STA is a terminal device that has a medium access control (MAC) and a physical layer (PHY) function interface and can communicate with the CAP. The transmitting and receiving dual-ends communicate through physical frames, and each physical frame period includes a downlink period and an uplink period in sequence: the CAP sends data to the STA in a downlink period; the STA sends data to the CAP in an uplink period. In the embodiment of the present invention, when the peer end immediately returns an acknowledgement frame, the indicated immediate return duration, that is, the next time period, means that the uplink physical frame period corresponds to the downlink physical frame period, or the downlink physical frame period corresponds to the previous one. The uplink period of the physical frame. Specifically, when the sending end is a CAP, when the data frame carrying the immediate acknowledgement indication is sent in the downlink physical period of the current frame, the immediate acknowledgement indication is used to instruct the STA to return a frame acknowledgement in the uplink physical period of the current frame. When the sending end is the STA, the data frame carrying the immediate acknowledgement indication is sent in the uplink physical period of the current frame, and the immediate acknowledgement indication is used to indicate that the CAP returns a frame acknowledgement response in the downlink physical period of the next frame.

2. Delayed confirmation:

When the immediate confirmation request is not received, it can be considered that the peer is allowed to delay the return of the acknowledgement of the return frame. In the embodiment of the present invention, an indication bit is agreed by both parties, and the explicit indication is delayed confirmation. For example, a field in the contracted data frame is a delayed acknowledgement indicator. The frame acknowledgement interval using delayed acknowledgement is determined by the sender and can be sent when there are free resources. When the data frame is parsed, if the delayed acknowledgement instruction is parsed from the data frame, the acknowledgement frame is returned when there is an idle resource.

Second embodiment

For the management control frame, the unicast management control frame without the corresponding response frame needs to be acknowledged by using ACK or group acknowledgement frame (GroupAck), otherwise it is directly confirmed by the corresponding response frame. The embodiment of the present invention further provides some management frame request frames and corresponding response frames, as shown in Table 2. Of course, in another embodiment, other management request frames and their corresponding responses may be set as needed, and the present invention is not limited herein.

Table 2

Request frame corresponding response frame Random Access Request Frame (RA - REQ) Random Access Response Frame (RA - RSP) Terminal Basic Capability Negotiation Request (SBC - REQ) Terminal Basic Capability Negotiation Response (SBC - RSP) Uplink Dynamic Service Setup Request (DSA - REQ) Dynamic Service Setup Response (DSA-RSP) Uplink Dynamic Service Tamper Request (DSC-REQ) Dynamic Service Tamper Response (DSC-RSP) Uplink Dynamic Service Delete Request (DSD-REQ) Dynamic Service Delete Response (DSD-RPP) Group Acknowledgement Request Frame (GroupAckReq) Group Acknowledgement Frame (GroupAck) Sleep Request Frame (SLP-REQ) Dormant Response Frame (SLP-RSP)

All non-broadcast management control frames (except random access request response frames and independent resource request frames) need to send an acknowledgment frame or an implicit acknowledgment. Implicit acknowledgment means that the acknowledgment frame can be treated as a acknowledgment frame for a unicast management control frame with a corresponding response frame. The non-broadcast management control frame does not need to be immediately confirmed, and the response frame can be responded to within the maximum number of physical frames allowed thereafter. The response frame sent by the CAP does not receive the acknowledgement frame of the STA. The response frame may be retransmitted before the preset maximum number of retransmissions. The number of retransmissions exceeds the preset maximum number of retransmissions. The frame. The data frame is determined by the sender using immediate acknowledgement and delayed acknowledgement. The receiving end can indicate whether an immediate confirmation is needed according to the field indicating the frame confirmation mode set in the MAC header. The frame confirmation wait interval is a time period using the immediately acknowledged frame. The frame acknowledgment interval using delayed acknowledgment is determined by the sender.

If the confirmation mode is immediate confirmation, if the confirmation frame is not received in the next time period, the data frame may be retransmitted before the preset maximum number of retransmissions is reached, and the number of retransmissions exceeds the preset maximum number of retransmissions. After that, the sender will discard the frame. The next time period mentioned here may be that the uplink physical frame period corresponds to the downlink physical frame period, or the downlink physical frame period corresponds to the uplink period of the previous physical frame. That is, when the data frame carrying the immediate acknowledgement indication is sent in the downlink physical period of the current frame, the immediate acknowledgement indication is used to indicate that the frame acknowledgement response is returned in the uplink physical period of the current frame; and the bearer is sent in the uplink physical period of the current frame. When the indicated data frame is immediately acknowledged, the immediate acknowledgement indication is used to indicate that the frame acknowledgement response is returned in the downlink physical period of the next frame. When the MPDU is retransmitted, the sequence number and the fragment number remain unchanged.

If the acknowledgement mode is delayed acknowledgement, if the acknowledgement frame is not received within the waiting interval set by the sender, the data frame may be retransmitted before the preset maximum number of retransmissions is reached, and the number of retransmissions exceeds the preset number. After the maximum number of retransmissions, the sender will discard the frame.

ACK frames and GroupAck frames no longer require additional frames for acknowledgment. For fragmented and unfragmented data frames, either ACK or GroupAck can be used to confirm. The embodiment of the present invention further provides another frame confirmation mode (ACK frame;), which is suitable for confirming for a single frame. For a more intuitive description, the embodiment of the present invention further provides a format of a specific acknowledgement frame, as shown in FIG. The acknowledgement frame shown in FIG. 3 includes a frame header, a frame body, and frame check information (FCS). The frame header includes frame control information, such as a frame type (management frame or data frame), a subtype (specific management frame type, or a specific data frame type), version information, and the like; the frame body includes the FID and the fragment number ( FSN), frame sequence number (SN). Refer to Table 3 for the definition of each parameter in the frame body.

table 3

Third embodiment

An embodiment of the present invention provides a retransmission method, as shown in FIG. 4, including the following steps: Step S401: Cache a transmitted frame;

Step S402: Receive and parse the frame acknowledgement response. Step S403: Retransmit the buffered frame and not acknowledge the received frame. The retransmission method provided by the embodiment of the present invention maintains the retransmitted data by the transmitting end. When retransmitting, only the unacknowledged received frame is retransmitted, and the already received frame is not retransmitted. Especially when retransmitting data according to the preset window, the frame that has been confirmed to have been acknowledged in the window is not retransmitted, which greatly saves transmission resources.

Preferably, frames that have been acknowledged to be received in the buffered frame may be deleted. This effectively saves local cache resources.

Preferably, one or more consecutive frames may be encapsulated into a framing (G-MPDU) transmission. As shown in FIG. 5, the G-MPDU is composed of a series of G-MPDU subframes. As shown in Figure 6, the G-MPDU subframe includes the G-MPDU delimiter, MPDU, and possibly padding bytes. In addition to the last G-MPDU sub-frame, each G-MPDU sub-frame needs to be boosted. 0~1 padding bytes, making each The length of the G-MPDU subframe is an integer multiple of 2 bytes. The G-MPDU delimiter shown is used to locate the MPDU unit of the G-MPDU. Multiple frames are encapsulated and sent out. When transmitting on a physical channel, multiple frames can be obtained by performing synchronization of one frame (frame), thereby effectively saving physical transmission resources.

The frame acknowledgment response received in step S402 may be the group acknowledgment response provided by the first embodiment, or may be the acknowledgment response of the single frame provided in the second embodiment.

Fourth embodiment

For the purpose of the cache capability, in order to prevent the error from being exceeded, the embodiment of the present invention further provides a method for retransmission, which increases the buffering capability of the local end, and may detect that the buffering capability may exceed the risk. , promptly notify the peer to return the response immediately, as shown in Figure 7, including the steps:

Step S701: Cache a frame that does not receive the acknowledgement response; Step S701: Determine whether the cache capacity threshold is reached;

Step S701: When the buffer capacity threshold is reached, an immediate acknowledgement request is sent to indicate that the frame acknowledgement response is immediately returned. Preferably, the immediate acknowledgement request carries an identification of one or more traffic flows, and an identification of one or more frames on each traffic flow to indicate an immediate acknowledgement of the acknowledgment of the specified frame on the designated data stream. Preferably, the immediate acknowledgement request may carry the sequence number of the first frame on each service flow that needs to return a response, to instruct the peer end to return an acknowledgement response of the frame from the first frame on the service flow. For a more intuitive explanation, the embodiment of the present invention further provides a specific frame format of the immediate confirmation request, as shown in FIG. 8. The immediate acknowledge request frame shown in Figure 8 includes a frame header, a frame body, and frame check information (FCS). The frame header contains frame control information, such as a frame type (management frame or data frame), a subtype (specific management frame type, or a specific data frame type), version information, etc.; the frame body contains one or more FID information. a block, each FID information block includes a service flow identifier FID and a sequence number, where the sequence number is a sequence number of the first frame of the service that needs to return an acknowledgement response, to indicate that the peer end returns an acknowledgement response from the first frame, and implements The sequence number of the frame corresponding to the first bit of the bitmap in the group confirmation provided in the first example corresponds. Refer to Table 4 for the definition of each parameter in the frame body. Table 4 Field Length (ratio Description

Special)

Reserved 4 is set to 0 by default. FID 4 indicates the number of FID information blocks included between this field and the FCS. The format of each FID information block is the same.

FID 4 requires the receiving end to perform GroupAck confirmation on the FID service flow.

SSN 12 notifies the receiving end to use this value when GroupAck confirms

Bi tma starting sequence number.

Preferably, the embodiment of the present invention further provides another manner for implementing an immediate acknowledgement request: by transmitting an immediate acknowledgement indication in a data frame, sending the data frame with an immediate acknowledgement request; the immediate acknowledgement indication, Used to indicate that the frame confirmation response is returned immediately. Preferably, the immediate acknowledgement indication can be carried in the frame header of the data frame.

The immediate return frame acknowledgement response returns the group acknowledgement response in the next time period. The next time period refers to an uplink physical frame period corresponding to a downlink physical frame period, or a downlink physical frame period corresponding to an uplink period of a previous physical frame. That is, when the data frame carrying the immediate acknowledgment indication is sent in the downlink physical period of the current frame, the immediate acknowledgment indication is used to indicate that the peer end returns a frame acknowledgment response in the uplink physical period of the current frame; When the data frame carrying the immediate acknowledgement indication is sent, the immediate acknowledgement indication is used to indicate that the peer end returns a frame acknowledgement response in the downlink physical period of the next frame.

Preferably, in the embodiment of the present invention, the delay confirmation indication is carried in the data frame when the buffer capacity threshold is not reached, and is sent out along with the data frame. The delayed acknowledgement indication is used to indicate an acknowledgement response that allows a delay to return all unacknowledged data frames on each traffic flow. When the peer parses the data frame, if the delay acknowledgement instruction is parsed from the data frame, all unacknowledged frame acknowledgement responses on each service flow are returned when there is an idle resource. The embodiment of the present invention further provides a selection of a frame acknowledgment transmission timing, where the central access point (CAP) and the station (STA) can be mutually a transmitting end and a receiving end, and specifically include:

1. If the CAP sends a management control frame (requires acknowledgment) to the STA, the CAP needs to reserve resources for the acknowledgment frame when scheduling the uplink transmission resource, ensuring that the STA has the opportunity to successfully send the acknowledgment frame.

2. If the CAP sends a G-MPDU to the STA and instructs the STA to perform immediate acknowledgment through the field indicating the frame acknowledgment mode, the CAP needs to reserve resources for the GroupAck frame or the ACK frame when scheduling the uplink transmission resource.

3. If the CAP sends an aggregated data frame to the STA, and the field indicating the frame acknowledgement mode indicates that the STA is allowed to delay the response, the STA may actively transmit the GroupAck frame when the uplink transmission resource has remaining, or may wait to receive the message. The GroupAck frame is returned after the CAP sends an immediate confirmation notification.

4. If the STA sends a management control frame (requires confirmation) to the CAP, the CAP should be under The downlink physical period of one frame is confirmed.

5. If the STA sends a G-MPDU to the CAP and instructs the CAP to confirm immediately by the field indicating the frame acknowledgement mode, the Bay's CAP sends a GroupAck frame or an ACK frame in the downlink physical period of the next frame.

6. If the STA sends an aggregated data frame to the CAP, and the field indicating the frame acknowledgement mode indicates that the CAP is allowed to delay the response, the CAP may actively return the GroupAck frame when the downlink transmission resource has remaining, or may wait for receiving. The GroupAck frame is returned after the STA sends an immediate confirmation notification.

Fifth embodiment

In order to implement the frame acknowledgment method in the embodiment of the present invention, the present invention further provides an apparatus for frame acknowledgment, as shown in FIG. 9, including: a packaging module 901, configured to encapsulate an acknowledgement response of one or more frames into a group acknowledgement The sending module 902 is configured to send the group acknowledgement response. Preferably, the encapsulating module 901 is configured to encapsulate an acknowledgement response of one or more frames on the same service flow as a service flow acknowledgement response; and encapsulate one or more of the service flow acknowledgement responses into a group acknowledgement response. Preferably, the encapsulating module 901 is configured to encapsulate a frame header, a frame body, and an FCS of the group acknowledgement response: set one or more FID information blocks in the frame body, where the service flow confirmation response includes a service flow identifier, a sequence number and a bitmap bitmap, wherein the bitmap is used to carry an acknowledgment response of consecutive frames, each bit in the bitmap corresponds to an acknowledgment response of one frame, and the sequence number is used to indicate that the first bit in the bitmap corresponds to The serial number of the frame.

Preferably, the encapsulating module 901 is configured to set each FID information block according to the length of the bitmap; the length of the bitmap is not fixed.

Preferably, the encapsulating module 901 further sets a length field of the bitmap in the FID information block to indicate the length of the bitmap.

Preferably, the encapsulating module 901 further sets fragmentation indication information in the FID information block to indicate an acknowledgement response of the frame that is carried in the bitmap, or an acknowledgement of an unfragmented frame. Answer. Preferably, the encapsulating module 901 further sets a management control frame acknowledgement bit in the group acknowledgement response for confirming receipt of a no-serial number management control frame. Preferably, the encapsulating module 901 further sets a length field in the frame body for indicating the sum of the lengths of all the FID information blocks. Preferably, the acknowledgement response of the frame is used to indicate the reception status of the frame, including received and not received.

Preferably, the method further includes: a first control module 904, configured to receive an immediate acknowledgement request, and control the encapsulation module 901 to encapsulate the group acknowledgement response, and control the transmit module 902 to immediately send the encapsulated group acknowledgement response.

Preferably, the immediate confirmation request carries an identifier of one or more service flows, and an identifier of one or more frames on each service flow; the first control module 904, according to the immediate confirmation request control The encapsulation module 901 encapsulates an acknowledgment response specifying a frame on the data stream as a group acknowledgment response. Preferably, the immediate transmission is to return the group confirmation response in a next time period. The next time period means that the uplink physical frame period corresponds to the downlink physical frame period, or the downlink physical frame period corresponds to the uplink period of the previous physical frame. That is, the first control module 904, when receiving the immediate acknowledgement request from the downlink physical period of the current frame, controls the sending module 902 to send the encapsulated group acknowledgement response in the uplink physical period of the current frame; When the uplink physical period of the current frame receives the immediate acknowledgement request, the sending module 902 is controlled to send the encapsulated group acknowledgement response in the downlink physical period of the next frame.

Preferably, the method further includes:

The second control module 904 is configured to receive a data frame carrying an immediate acknowledgement indication, control the encapsulation module 901 to encapsulate the group acknowledgement response according to the immediate acknowledgement indication, and control the sending module 902 to immediately send the encapsulated group acknowledgement response. Preferably, the second control module 904 is configured to control the encapsulating module 901 to encapsulate an acknowledgment response of all unacknowledged frames on each service flow into a group acknowledgment response, and control the sending module 902 to immediately send the encapsulation. The group confirms the response. Preferably, the second control module 904 obtains the immediate confirmation indication by parsing the frame header of the data frame. Preferably, the immediate sending is to return the group acknowledgement response in a next time period; the next time period is that the uplink physical frame period corresponds to a downlink physical frame period, or the downlink physical frame period corresponds to a previous physical period The up period of the frame. That is, the second control module 904, when receiving the data frame carrying the immediate acknowledgement indication from the downlink physical period of the current frame, controls the sending module 902 to send the encapsulated group acknowledgement response in the uplink physical period of the current frame; When receiving the data frame carrying the immediate acknowledgement indication from the uplink physical period of the current frame, the transmitting module 902 is controlled to transmit the encapsulated group acknowledgement response in the downlink physical period of the next frame. Preferably, the method further includes:

a third control module 905, configured to receive a data frame carrying a delay confirmation indication, according to the delay The indication indicates that the encapsulation module 901 encapsulates the group acknowledgment response when there is an idle resource, and controls the sending module 902 to send the encapsulated group acknowledgment response.

Sixth embodiment

In order to implement the frame confirmation method in the embodiment of the present invention, the present invention further provides another apparatus for frame confirmation, as shown in FIG. 10, including:

The encapsulating module 1001 is configured to generate a group acknowledgment request, where the group acknowledgment request carries an identifier of one or more service flows and an identifier of a frame that needs to be confirmed on each service flow; and a sending module 1002, configured to send the group acknowledgment request . Preferably, the encapsulating module 1001 is configured to encapsulate a group confirmation request frame to generate the group confirmation request.

The group confirmation request includes a frame header, a frame body, and an FCS, where the frame body includes one or more FID information blocks, and each FID information block includes a service flow identifier FID and a sequence number, and the service flow needs to be answered. The sequence number of the first frame is used as the identifier of the frame to be acknowledged on the service flow, indicating that the frame acknowledgement is returned from the first frame.

Preferably, the encapsulating module 1001 further sets an FID number field in the group confirmation request to indicate the number of FID information blocks included in the frame body. Preferably, the group acknowledgment request is used to indicate that the acknowledgment response of the specified frame on the specified data stream is immediately returned. Preferably, the immediate return group acknowledgement response is to return the group acknowledgement response in a next time period; the next time period is that the uplink physical frame period corresponds to a downlink physical frame period, or the downlink physical frame period corresponds to The upstream period of the last physical frame. That is, if the sending module 1002 sends a group acknowledgment request in the downlink physical period of the current frame, the immediate acknowledgment indication is used to indicate that the frame acknowledgment response is returned in the uplink physical period of the current frame; if the sending module 1002 is in the current frame The uplink physical period sends a group acknowledgment request, and the immediate acknowledgment indication is used to indicate that the frame acknowledgment response is returned in the downlink physical period of the next frame.

The present invention can be implemented or used by those skilled in the art in light of the disclosed embodiments. Various modifications to the embodiments are obvious to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope and spirit of the invention. The above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are included in the spirit and principles of the present invention, should be included in Within the scope of protection of the present invention.

Claims

Claim

A method for frame confirmation, comprising:

Send the group confirmation response.

2. The method of claim 1 wherein:

Encapsulating an acknowledgment response for one or more frames on the same traffic flow as a traffic flow acknowledgment response; encapsulating one or more traffic flow acknowledgment responses as a group acknowledgment response.

3. The method of claim 2, wherein:

Encapsulating the acknowledgment frame header, frame body and frame check information FCS; setting one or more FID information blocks in the frame body, where the FID information block includes a service flow identifier, a sequence number, and a bitmap bitmap, where The bitmap is used to carry an acknowledgment response for consecutive frames. Each bit in the bitmap corresponds to an acknowledgment response of one frame, and the sequence number is used to indicate the sequence number of the frame corresponding to the first bit in the bitmap.

4. The method of claim 3 wherein:

Each FID information block is set according to the length of the bitmap; the length of the bitmap is not fixed.

5. The method according to claim 3, further comprising: setting a length field of the bitmap in the FID information block to indicate a length of the bitmap.

The method according to claim 3, further comprising: setting fragmentation indication information in the FID information block to indicate that the bitmap carries an acknowledgement response of a fragmented frame, or A confirmation response for an unfragmented frame.

7. The method according to claim 3, further comprising: setting a management control frame acknowledgement bit in the frame body for confirming receipt of a no-serial number management control frame.

8. The method according to claim 3, further comprising: setting a length field in the frame body for indicating a sum of lengths of all FID information blocks.

9. The method according to claim 1, wherein: the acknowledgement response of the frame is used to indicate a reception status of the frame, including received and not received.

10. The method of claim 1 wherein: upon receipt of the immediate acknowledgement request, the group acknowledgement response is immediately returned.

11. The method of claim 10 wherein: The immediate acknowledgement request carries an identifier of one or more service flows, and an identifier of one or more frames on each service flow;

An acknowledgment response to the specified frame on the specified data stream is immediately returned in accordance with the immediate acknowledgment request.

12. The method of claim 1 wherein:

The data frame carrying the immediate acknowledgement indication is received and parsed, and the group acknowledgement response is immediately returned according to the immediate acknowledgement indication.

13. The method of claim 12, wherein: parsing a frame header of the data frame, obtaining an immediate confirmation indication therefrom.

The method according to claim 10, wherein: when receiving an immediate acknowledgement request or an immediate acknowledgement indication in a downlink physical period of the current frame, returning a group acknowledgement response in an uplink physical period of the current frame; When the physical cycle receives the immediate acknowledgement request or the immediate acknowledgement indication, it returns a group acknowledgement response in the downlink physical period of the next frame.

The method according to claim 1, wherein: when parsing the data frame, if the delayed acknowledgement indication is parsed from the data frame, the group acknowledgement response is returned when there is an idle resource.

16. An apparatus for frame acknowledgment, characterized by: an encapsulating module, configured to encapsulate an acknowledgment response of one or more frames into a group acknowledgment response; and a sending module, configured to send the group acknowledgment response.

The device according to claim 16, wherein: the encapsulating module is configured to encapsulate an acknowledgement response of one or more frames on the same service flow as a service flow confirmation response; and one or more of the The traffic flow acknowledgement response is encapsulated as a group acknowledgement response.

The device according to claim 17, wherein: the encapsulating module is configured to encapsulate a frame header, a frame body, and an FCS of the group acknowledgement response: setting one or more FID information blocks in the frame body, The service flow confirmation response includes a service flow identifier, a sequence number, and a bitmap bitmap, wherein the bitmap is used to carry an acknowledgement response of consecutive frames, and each bit in the bitmap corresponds to an acknowledgement response of one frame, and the sequence number is used for Indicates the sequence number of the frame corresponding to the first bit in the bitmap.

The device according to claim 18, wherein: the encapsulating module is configured to set each FID information block according to a length of the bitmap; the length of the bitmap is not fixed.

The apparatus according to claim 18, wherein: the encapsulating module further sets a length field of the bitmap in the FID information block to indicate a length of the bitmap.

21. Apparatus according to claim 18 wherein: The encapsulating module further sets fragmentation indication information in the FID information block to indicate that the bitmap is an acknowledgment response of a fragmented frame or an acknowledgment response of an unfragmented frame.

The apparatus according to claim 18, wherein: said encapsulating module further sets a management control frame acknowledge bit in the group acknowledgment response for confirming receipt of a no-serial number management control frame.

The apparatus according to claim 18, wherein: the encapsulating module further sets a length field in the frame body for indicating a sum of lengths of all FID information blocks.

The apparatus according to claim 16, wherein: the acknowledgement response of the frame is used to indicate a reception status of the frame, including received and not received.

The device according to claim 16, further comprising: a control module, configured to receive an immediate acknowledgement request, and control the encapsulated module package group to confirm the response, and control the sending module to immediately send the package A good group confirms the response.

26. Apparatus according to claim 25 wherein:

The immediate acknowledgement request carries an identifier of one or more service flows, and an identifier of one or more frames on each service flow;

The control module controls the encapsulating module to encapsulate an acknowledgment response of a specified frame on the designated data stream as a group acknowledgment response according to the immediate acknowledgment request.

The device according to claim 25, wherein: the control module, when receiving the immediate acknowledgement request from a downlink physical period of the current frame, controls the sending module to send in an uplink physical period of the current frame. The encapsulated group acknowledgement response; when receiving the immediate acknowledgement request from the uplink physical period of the current frame, controlling the sending module to send the encapsulated group acknowledgement response in the downlink physical period of the next frame.

The device according to claim 16, further comprising: a control module, configured to receive a data frame carrying an immediate acknowledgement indication, control the encapsulated module package group acknowledgement response according to an immediate acknowledgement indication, and control the The sending module immediately sends the encapsulated group acknowledgment response.

The device according to claim 28, wherein: the control module is configured to control the encapsulating module to encapsulate an acknowledgement response of all unacknowledged frames on each service flow into a group acknowledgement response.

The apparatus according to claim 28, wherein: said control module acquires said immediate confirmation indication by parsing a frame header of the data frame.

The device according to claim 28, wherein: the control module controls the uplink physical of the sending module in the current frame when receiving a data frame carrying an immediate acknowledgement indication from a downlink physical period of the current frame. Periodically sending a packaged group acknowledgment response; When receiving the data frame carrying the immediate acknowledgement indication from the uplink physical period of the current frame, the transmitting module is controlled to send the encapsulated group acknowledgement response in the downlink physical period of the next frame.

The device according to claim 16, further comprising: a control module, configured to receive a data frame carrying a delay acknowledgement indication, and control the encapsulation module package group confirmation when there is an idle resource according to the delay acknowledgement indication Answering, and controlling the sending module to send the encapsulated group acknowledgment response.

33. A method for frame acknowledgment, comprising:

Send the group confirmation request.

34. The method of claim 33, wherein: the encapsulating group acknowledges the request frame to generate the group acknowledgement request;

The method according to claim 34, wherein: the FID number field is further set in the group confirmation request, and is used to indicate the number of FID information blocks included in the frame body.

The method according to claim 33, wherein: when the group acknowledgment request is sent in a downlink physical period of the current frame, the immediate acknowledgment indication is used to indicate that a frame acknowledgment response is returned in an uplink physical period of the current frame; When the group acknowledgment request is sent in the uplink physical period of the current frame, the immediate acknowledgment indication is used to indicate that the frame acknowledgment response is returned in the downlink physical period of the next frame.

37. An apparatus for frame acknowledgment, comprising: an encapsulating module, configured to generate a group acknowledgment request, where the group acknowledgment request carries an identifier of one or more service flows and a acknowledgment on each service flow The identity of the frame;

a sending module, configured to send the group confirmation request.

The device according to claim 37, wherein: the encapsulating module is configured to encapsulate a group confirmation request frame to generate the group confirmation request; the group confirmation request includes a frame header, a frame body, and an FCS, The frame body includes one or more FID information blocks, and each FID information block includes a service flow identifier FID and a sequence number, and the sequence number of the first frame that needs to be answered on the service flow is used as a frame that needs to be confirmed on the service flow. An indication that the frame confirmation is returned from the first frame.

39. Apparatus according to claim 38 wherein: The encapsulating module further sets an FID number field in the group confirmation request, and is used to indicate the number of FID information blocks included in the frame body.

The device according to claim 37, wherein: the sending module is configured to send the group acknowledgment request in a downlink physical period of the current frame; and the immediate acknowledgment indication is used to indicate an uplink physics in the current frame. The cycle returns a frame acknowledgment.

The device according to claim 37, wherein: the sending module is configured to send the group acknowledgment request in an uplink physical period of the current frame; and the immediate acknowledgment indication is used to indicate a downlink physics in a next frame. The cycle returns a frame acknowledgment.