CN116419432A - Multilink transmission indication method and system - Google Patents

Multilink transmission indication method and system Download PDF

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Publication number
CN116419432A
CN116419432A CN202310408277.7A CN202310408277A CN116419432A CN 116419432 A CN116419432 A CN 116419432A CN 202310408277 A CN202310408277 A CN 202310408277A CN 116419432 A CN116419432 A CN 116419432A
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link
frame
block acknowledgement
mpdu
information
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朱海峰
何蓉
方旭明
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Southwest Jiaotong University
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Southwest Jiaotong University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The invention discloses a multilink transmission indication method and a system, which specifically comprise the following steps: the multi-link transmitting equipment transmits a BAR frame on a designated link after completing the transmission of the A-MPDU data frame on each link, wherein the BAR frame comprises multi-link BAR type indication information and multi-link redundancy block acknowledgement information; the multi-link receiving device receives the BAR frame, generates a BA frame indicating the receiving state of each MPDU on a plurality of links on a designated link, wherein the BA frame comprises multi-link BA type indication information, corresponding link indication information and type information of failed MPDU receiving, and simultaneously and redundantly transmits the BA frame on the plurality of links according to multi-link redundancy block acknowledgement information in the BAR frame, so that the probability of successful receiving of the BA frame can be increased. The invention can improve the transmission efficiency of the multi-link communication, increase the reliability of BA frame transmission, distinguish the different state information such as data frame decoding failure, data frame loss and the like, and lay a foundation for selecting a proper confirmation retransmission link strategy.

Description

Multilink transmission indication method and system
Technical Field
The present invention belongs to the field of wireless communication, and in particular, relates to a method and a system for indicating multilink transmission.
Background
With the development of wireless technology, the multi-link device can support multi-link communication, for example, communication is performed at the same time in frequency bands such as 2.4GHz, 5GHz and 6GHz, even millimeter wave, or the best frequency band is selected from multiple links, so as to ensure the communication quality. In wireless local area network data transmission, after receiving an aggregated media access control layer protocol data unit (Aggregation Medium Access Control Protocol Data Unit, a-MPDU), a transmitting device may send a Block acknowledgement request (Block ACK Request, BAR) frame, and the receiving device feeds back a Block acknowledgement frame (Block ACK, BA) frame of a corresponding type according to the BAR type, and feeds back the receiving condition of each MPDU in the received a-MPDU. In a multilink communication scenario, the multilink device supports simultaneous communication of multiple links, and the multilink device may reply to a BA frame only on one link, carrying an indication of the a-MPDU reception status on the multiple links, so as to improve efficiency. On the other hand, the BA frames can be replied in a redundancy manner on a plurality of links at the same time, so as to improve the reliability of BA frame reception, and the redundancy condition and the receiving state of the data packet need to be indicated. In addition, a specific type of data frame transmission failure (such as decoding failure, packet loss, etc.) needs to be indicated, so that a suitable retransmission strategy is convenient to select and use. The conventional BA frame cannot indicate link information to which the MPDU belongs, and cannot indicate specific status information of a data frame transmission failure. Therefore, it is necessary to design a multilink block acknowledgement request BAR frame and block acknowledgement BA frame structure suitable for the multilink MAC (Media Access Control) architecture, which carries link information, data frame reception status, and data frame transmission failure types.
Disclosure of Invention
In order to realize in the multilink communication scene, after the data transmitting end transmits a plurality of a-MPDUs corresponding to one or a plurality of service type identifiers (Traffic Identifier, TID) to the data receiving end along a plurality of links, the data receiving end transmits a multilink block acknowledgement (ML-BA) frame on a designated link, so that correct feedback of the receiving state of each MPDU in the a-MPDUs received on the plurality of links can be completed, or the ML-BA frame is simultaneously and redundantly transmitted on the plurality of links, thereby improving the reliability of transmission. The invention provides a multilink transmission indication method and a multilink transmission indication system.
The invention relates to a multi-link transmission indication method, which aims at uplink and downlink multi-link communication scenes, and when a multi-link data transmitting terminal transmits A-MPDUs to the same data receiving terminal by a plurality of links, the data receiving terminal carries A-MPDU block acknowledgement information of a plurality of links in one multi-link BA frame; transmitting a multi-link BA frame indicating whether each MDPU in each A-MPDU on a plurality of links is correctly received or simultaneously and redundantly transmitting a plurality of link BA frames on a plurality of links so as to improve the transmission reliability of the BA frames; meanwhile, after the block acknowledgement field indicating that each MDPU receives or fails correctly, a variable-length field indicating MPDU receiving failure type is added to distinguish data frame decoding failure from data frame loss state information.
When the multilink data transmitting end indicates that the data receiving end simultaneously transmits multilink BA frames indicating whether each MDPU in a-MPDU transmitted on multiple links is correctly received on one link or multiple links, the multilink BAR frames need to be transmitted, and indicates whether the data receiving end needs to repeatedly transmit the multilink BA frames on the multiple links through the multilink block acknowledgement frame redundancy transmission indication field.
The BAR frame includes a multi-link block acknowledgement request indication field for indicating whether a reply to each a-MPDU block acknowledgement information on a plurality of links can be completed on one link, and a multi-link block acknowledgement frame redundancy transmission indication field for indicating whether a receiving device repeatedly transmits a multi-link BA frame on a plurality of links.
When the multilink equipment in the multilink transmission scene is a multi-MAC MLO architecture (i.e. each link has an independent MAC address), the adopted multilink BA frame carries a plurality of block acknowledgement information bit maps corresponding to each link and link information corresponding to the link block acknowledgement bit maps, and the bit maps for explaining the receiving failure types of each MPDU are added after the block acknowledgement bit maps.
The multilink equipment sends a multilink BA frame which comprises a multilink block acknowledgement indication field, a link sequence number field of a corresponding link block acknowledgement bitmap and an additional bitmap field of a corresponding MPDU receiving failure type in the block acknowledgement bitmap; the multi-link block acknowledgement indication field is used for indicating whether the acknowledgement information reply of each A-MPDU block on a plurality of links is completed on one link; the link number field of the corresponding link block acknowledgement bitmap is used for indicating the link information corresponding to the block acknowledgement bitmap; the bitmap field in the block acknowledgement bitmap, which corresponds to the type of MPDU reception failure, is used to indicate whether the reception status of a data frame error is decoding failure or the ability to not receive the data frame.
When the multilink equipment in the multilink transmission scene is a single MAC MLO architecture (namely, a plurality of links share a single MAC address), the adopted multilink BA frame carries a bit map comprising a plurality of link block acknowledgement information, and the bit map for explaining each MPDU receiving failure type and corresponding link information of the receiving failure MPDU is added after the block acknowledgement bit map, wherein the bit number required by the link information is determined by specific link information coding granularity indication information.
The multilink equipment sends a multilink BA frame which comprises a multilink block acknowledgement indication field, an additional bitmap link information coding granularity field and an additional bitmap field corresponding to the MPDU receiving failure type and the link sequence number corresponding to the receiving failure MPDU in the block acknowledgement bitmap; the multi-link block acknowledgement indication field is used for indicating whether the acknowledgement information reply of each A-MPDU block on a plurality of links is completed on one link; the additional bitmap link information encoding granularity field is used for indicating the encoding bit number required by corresponding MPDU link information in the additional bitmap; the additional bitmap field in the block acknowledgement bitmap, which corresponds to the type of MPDU reception failure and the link sequence number corresponding to the MPDU reception failure, is used to indicate whether the reception status of the data frame error is decoding failure or the capability of not receiving the data frame, and the link information corresponding to the erroneous data frame.
The invention relates to a multilink transmission indicating system, which comprises an access point and a station under a multilink communication scene; both stations and access points can operate on multiple links and become data transmitting or receiving ends; the data transmitting terminal transmits data to the data receiving terminal on a plurality of links within a preset data transmission opportunity time, and the data transmitting terminal transmits a multi-link type block acknowledgement request frame to the data receiving terminal on a specific link after the data transmission of the plurality of links is completed; the data receiving end only sends the multi-link type block acknowledgement frame simultaneously comprising a plurality of link data receiving states on one specific link, or sends the multi-link type block acknowledgement frame simultaneously in a redundancy way on a plurality of links; in the multi-link type block acknowledgement frame, different link information indication methods are provided according to the multi-link device architecture, and information about the status type (decoding failure or not receiving the data frame) capability of the data frame error reception is carried after the block acknowledgement information.
The beneficial technical effects of the invention are as follows:
the invention aims at a multilink communication scene, and the multilink sending device can instruct the receiving device to reply the link information of the BA frame. The BAR frame and the BA frame can be sent only on one link, so that the indication of the receiving state of the A-MPDU on a plurality of links is realized, and the efficiency is improved; the same BA frame can be transmitted in a plurality of links in a redundancy way, so that the reliability of BA frame transmission is improved, and unnecessary retransmission caused by BA frame receiving failure is avoided. In addition, on the basis of the existing Block ACK Bitmap field for indicating correct reception or failure of each MDPU, a field for indicating MPDU reception failure type is increased, so that different state information such as data frame decoding failure, data frame loss and the like can be distinguished, and a foundation is laid for selecting a proper acknowledgement retransmission link/strategy.
Drawings
Fig. 1 is a schematic diagram of a multi-link wireless communication system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an association relationship between multiple link devices according to an embodiment of the present invention;
fig. 3 is an interactive schematic diagram of a multilink transmission indication method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a structure of a multi-link block acknowledgement request frame according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a multi-link block acknowledgment frame redundant transmission in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a multi-link device architecture according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a multi-link block acknowledgement frame that may be employed in a multi-MAC MLO architecture according to an embodiment of the invention;
FIG. 8 is a diagram illustrating the correspondence between BA Bitmap and Multi-MAC BAAddButtmap bits in a Multi-link BA frame according to an embodiment of the present invention;
FIG. 9 is a diagram of a multi-link block acknowledgement frame that may be employed in a second multi-MAC MLO architecture according to an embodiment of the invention;
FIG. 10 is a diagram of a multi-link block acknowledgment frame that may be employed in a third multi-MAC MLO architecture in accordance with an embodiment of the invention;
FIG. 11 is a schematic diagram of a multi-link block acknowledgement frame that may be employed in a single MAC MLO architecture according to an embodiment of the invention;
fig. 12 is a schematic diagram showing the correspondence between BA Bitmap and Single-MAC BA addbits in a multi-link BA frame according to an embodiment of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
In the end stage of data transmission, the multilink device as a data transmitting end sends a multilink block acknowledgement request (ML-BAR) frame to the multilink device as a data receiving end, and the ML-BAR frame utilizes a Reserved (Reserved) field in a BAR Control field and simultaneously defines a multilink block acknowledgement request indication (Multi-Link BAR Indication) subfield and a multilink block acknowledgement frame redundancy transmission indication (BA Repeat Indication) subfield. The Multi-Link BAR Indication subfield is used to indicate that the frame is an ML-BAR frame, to request the multilink receiving device to transmit an ML-BA frame carrying multilink block acknowledgement information, or as a generic BAR frame, to perform an existing BA mechanism. The BA Repeat Indication subfield indicates to the receiving device to send ML-BA frames on only one link or to send ML-BA frames redundantly on all links transmitting data frames simultaneously.
After receiving the ML-BAR frame, the multi-link receiving device feeds back the ML-BA frame of each a-MPDU receiving status on the multi-link on one or more links according to the indication. Depending on the architecture of the multilink device, ML-BA frames are divided into two types. Under the Multi-MAC MLO (Multi-Link Operation) architecture, the designed ML-BA frame uses a reserved field in the BA Control field to define a Multi-Link block acknowledgement indication (Multi-Link BA Indication) subfield for indicating whether the BA frame only carries the present Link block acknowledgement information or the Multi-Link block acknowledgement information. The data frame receiving status Information of the ML-BA frame is indicated by a BA Information field, where the BA Information field of the BA frame in the existing protocol contains one or more independent Information structures, e.g. if the data frame corresponds to a plurality of TIDs, each independent Information structure is identified by a TID. To better illustrate the multi-link transmission indication method of the embodiments of the present application, each independent information structure is referred to as a block acknowledgement information field segment. The specific information contained in the block acknowledgement information field segment in the embodiments provided in this application is different according to the different BA Type subfield bit values in the BA Control field in the ML-BA frame. To carry specific Link information, a Link Value (Link Value) subfield is newly added in the block acknowledgement information field segment, defined by the Reserved field, or by extending the original field. Each block acknowledgement information field segment corresponds to a block acknowledgement Bitmap (BA Bitmap) sub-field, after which a MAC block acknowledgement additional Bitmap (Multi-MAC BA AddBitmap) sub-field is added to indicate whether the reception status of a data frame error is decoding failure or the capability of not receiving the data frame.
Under the single MAC MLO architecture, the designed ML-BA frame also defines a Multi-Link BA Indication subfield using the Reserved field in the BA Control field. The BA Information field containing the data frame reception status Information contains one or more block acknowledgement Information field segments, each block acknowledgement Information field segment corresponding to a BA Bitmap subfield, after which a Single MAC block acknowledgement additional Bitmap (Single-MAC BA addbits map) subfield is added to indicate whether the reception status of a data frame error is decoding failure or the capability of not receiving the data frame, and link Information corresponding to the data frame of the error.
Examples:
1. multilink wireless communication system
The network device of the present invention may be a device for communicating with a terminal, or the network device may be a relay station, an access point, a vehicle device, a wearable device, a network device in a 5G network, a network device in a future 6G network, or a network device in a PLMN network, etc. The multilinks may be different frequency bands, or different subchannels of the same frequency band; may be a low frequency link or a high frequency link, such as a millimeter wave band. Fig. 1 is a schematic diagram of an application scenario of a method and a system for indicating multi-link transmission. The Access Point (AP) may be a communication server, a router, a switch, or a base Station, or any of the above network devices, and the Station (STA) may be a mobile phone, a computer, or any of the above terminals.
In the multi-link wireless communication system shown in fig. 1, the base station is exemplified by an AP, and the STA is exemplified by a mobile phone. The communication Device in the Multi-Link wireless communication system may be a wireless communication Device supporting parallel transmission of a plurality of links, for example, a Multi-Link Device (MLD). A multi-link device has higher transmission efficiency and higher throughput than a device that supports only a single link transmission. The multilink device includes one or more affiliated stations STA (Affiliated STA), which are logical stations that can operate on a link. Wherein the affiliated stations can be APs or non-AP STAs. For convenience of description, the multi-link device with the affiliated station as an AP in this embodiment may be referred to as a multi-link AP or multi-link AP device or AP multi-link device (AP MLD), and the multi-link device with the affiliated station as a non-AP STA may be referred to as a multi-link STA or multi-link STA device or STA multi-link device (non-AP MLD).
2. Multilink device architecture specification
Fig. 2 is a schematic diagram of an association relationship between multiple link devices in this embodiment. The AP MLD shown in fig. 2 may be composed of a plurality of APs, and the STA MLD may be composed of a plurality of STAs. Each AP in the AP MLD associates with a corresponding STA in the STA MLD to enable multi-link communication. As shown in fig. 2, APs 1 to AP3 in the AP MLD operating on links 1, 2, 3 are associated with STAs 1 to STA3 in the STAMLD, respectively. The association is established such that each AP in the AP MLD can establish a connection with a corresponding STA in the STA MLD on a respective link. Meanwhile, in order to realize the multi-link communication between two MLDs, a MAC layer multi-link operation carrier aggregation solution is required to be executed in the MLDs. According to the multilink reference model given in 802.11be, the MAC layer can be divided into an Upper MAC layer (UMAC) and a Lower MAC layer (LMAC, lower MAC), which allow data frames to be transmitted simultaneously over multiple links. UMAC is a common part of all interfaces, responsible for link management, buffering traffic from the upper layer before being allocated to a particular LMAC interface for transmission, while buffering traffic from the LMAC interface before being delivered to the upper layer. UMAC also supports seamless handover between links to minimize access latency and achieve high-efficiency load balancing. The LMAC, as a separate interface part under the UMAC, performs a link specific function through its own channel access method and parameters.
3. Related concepts related to embodiments of the invention
The BA mechanism of the existing Wi-Fi network is proposed in the 802.11e standard at the earliest and is perfect in the 802.11n standard. The BA mechanism has evolved after the 802.11n standard, such as Multi-STA type BA frames. The BA mechanism improves channel efficiency by aggregating multiple "acknowledgement" messages into one frame. The BA mechanism is initiated by exchanging an add block acknowledgement (Add Block Acknowledgment, ADDBA) request frame and an ADDBA reply frame or a no request BA extension mechanism (unsolicited block ack extension mechanism). The transmitting device sends an ADDBA request frame and the receiving device replies with an ADDBA reply frame, so that the BA mechanism/session establishment between the transmitting device and the receiving device is successful. During data transmission, the transmitting apparatus transmits a plurality of MPDUs to the receiving apparatus at SIFS (Short Interframe Space) intervals, or aggregates a plurality of MPDUs into one a-MPDU to be transmitted to the receiving apparatus. The acknowledgement policy for the transmitted data is classified into a explicit BAR policy and an implicit BAR policy. The BAR policy is shown that after the last data transmission is completed, the transmitting device transmits a BAR frame request feedback BA frame. The implicit BAR policy directly feeds back the BA frame by the receiving device after the last data transmission is completed without BAR frame request. To enable the generation of BA frames on a given link indicating the receipt status of each MPDU on multiple links, it may be necessary to wait for all links to transmit to completion and then indicate the ML-BA frame transmission link. The related indication information of the multi-link block acknowledgement can be carried in the ML-BAR frame by adopting the display BAR strategy so as to indicate the receiving equipment to send the ML-BA frame; whereas the use of the implicit BAR policy may default to sending the ML-BA frame through negotiation of the sending device and the receiving device. Under both BAR strategies, the frame structure design of the ML-BA frame is similar.
4. The invention aims to solve the technical problems
In the scheme designed by the invention, the sending equipment in the multilink BA mechanism needs to indicate the multilink block acknowledgement frame to redundantly send link information in the BAR frame, and the receiving equipment replies the BA frame carrying all link A-MPDU receiving states and indicating specific receiving error type information on one or more specified links according to the information carried in the received BAR frame. The present invention specifically designs the ML-BAR frame and the ML-BA frame used in the multilink communication flow.
5. Multilink transmission indication method and system
The following method implementation flow and frame structure design is based on the IEEE 802.11ax standard, but is not limited to the 802.11ax standard, and is also applicable to Wi-Fi7 and subsequent Wi-Fi standards. The invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 3 is an interactive schematic diagram of the multilink transmission indication method. The method is based on an explicit BAR policy and is elucidated from the perspective of frame interactions between BAR frame transmitting devices and BA frame transmitting devices. The multi-link device as a data transmitting end transmits a BAR frame to a data receiving end to request feedback of a data receiving state. After receiving the BAR frame, the multi-link device as the data receiving end feeds back the ML-BA frame carrying the data receiving states of the multiple links on one or more links according to the indication information.
Fig. 4 is a schematic diagram of a structure of a multi-link block acknowledgement request frame according to this embodiment. An ML-BAR frame of this embodiment is used as a newly designed BAR frame, and Multi-Link BAR Indication subfields and BA Repeat Indication subfields are defined by using the Reserved field in the BAR Control field. The Multi-Link BAR Indication subfield indicates that the frame requests the multilink receiving device to transmit an ML-BA frame carrying multilink block acknowledgement information as an ML-BAR frame or performs an existing BA mechanism as a generic BAR frame, in addition to the BAR Type indication that the BAR frame is originally of. To increase the probability that a device sending a BAR frame successfully receives a BA frame, the BA Repeat Indication subfield indicates that the receiving device sends an ML-BA frame on only one link, or sends an ML-BA frame redundantly on all links transmitting data frames simultaneously, as shown in fig. 5. The Multi-Link BAR Indication subfield and BA Repeat Indication subfield functions and detailed definitions are set forth below:
multi Link BAR Indication subfield
This field is used to indicate whether the multilink receiving device receiving the BAR frame is suitable for transmitting the ML-BA frame, and has a field length of 1 bit. When the field value is 1, the receiving device is suitable for sending the ML-BA frame, and when the field value is 0, the receiving device is unsuitable for being compatible with the existing BA mechanism.
2.BA Repeat Indication subfields
This field is used to instruct a receiving device receiving the BAR frame to transmit the ML-BA frame on only one link or to transmit the ML-BA frame redundantly on all links transmitting the data frame simultaneously, the field length being 1 bit. When this field value is 1, it indicates that the receiving device is simultaneously redundant for ML-BA frames on all links transmitting the data frame. When the field value is 0, it means that the data is transmitted only on the link receiving the ML-BAR frame.
According to the MAC layer carrier aggregation solution of the multi-link device, the multi-link device architecture can be divided into a single MAC MLO architecture and a multi-MAC MLO architecture into two types, as shown in fig. 6. In both architecture types, in order to manage the MAC layer and the Physical (PHY) layer, there is one multilink management entity in each device, which is mainly responsible for collecting the layer-related states from various layer management entities, and setting the related parameter values. In the multi-MAC MLO example architecture, the MAC layer is divided into two sublayers, the UMAC layer and the LMAC layer, and the main functions of the MAC layer of the multi-link device are implemented by the unified UMAC layer under the multi-link management entity. Each LMAC layer has independent MAC addresses, and functions such as channel state monitoring are realized in the LMAC layer. In the single MAC MLO example architecture, only one MAC address serves as the physical identity of the device, and transmissions between multiple links are transparent to the multilink management entity. When the device receives the ML-BAR frame, the present embodiment provides a multi-link block acknowledgement frame that can be used by the ML-BAR frame transmitting device in the single MAC MLO architecture and an ML-BA frame that can be used by the ML-BAR frame transmitting device in the multi-MAC MLO architecture, where the ML-BA frame in the multi-MAC MLO architecture is different according to the BA Type subfield bit value in the BA Control field.
Fig. 7 is a schematic diagram of an ML-BA frame structure that can be adopted by an ML-BA frame Type of reduced BA, with a specific BA Type subfield bit value of 2, under a multi-MAC MLO architecture of this embodiment. In addition to defining Multi-Link BA Indication subfields by using Reserved fields in the BA Control field, a new PerLID Info subfield and Multi-MAC BA AddBitmap subfield are added to each block acknowledgment field segment. A Link Value subfield is defined in the Per LID Info subfield to indicate Link information, and a Multi-MAC BA addframe subfield to indicate whether the reception status of a data frame error is a decoding failure or the capability of not receiving the data frame. The following sets forth the Multi-Link BA Indication subfield, link Value subfield, and Multi-MAC BA addbmap subfield functions and detailed definitions:
multi Link BA Indication subfield
The field is used to indicate whether the BA frame contains the reception status information of each MDPU in the a-MPDU transmitted on multiple links, and the field length is 1 bit. When the field value is 1, it indicates that the BA frame contains a plurality of link data frame reception states, and when the field value is 0, it indicates that only the link is contained.
Link Value subfield
The field is used for indicating the link sequence number corresponding to the block acknowledgement Information field segment in the BA Information field, the field length is 4 bits, and at most 16 links can be represented. For example, this field is set to 0011, indicating that the corresponding link number is 3. If the Multi-Link BA Indication subfield Value is 0, i.e., the receiving device is not suitable for transmitting the ML-BA frame, it is not necessary to carry the Link information through the Link Value subfield.
MultiMAC BA AddBItmap subfield
When the Multi-Link BA Indication subfield value is 1, that is, the receiving device is suitable for sending the ML-BA frame, the Multi-MAC BA addbmap subfield is newly added after the original BA Bitmap subfield. This field indicates in the form of a Bitmap (Bitmap) whether the reception status of a data frame error in the BA Bitmap subfield is a decoding failure or the capability of not receiving the data frame. The length of the field is variable, and the field is shown in fig. 8 as a sequential Bitmap sequence coding schematic diagram. Wherein the BA Bitmap indicates the reception status of 1 corresponding MPDU with 1 bit, and when the bit is 1, the reception of MPDU is successful, and when the bit is 0, the reception is not successful. The Multi-MAC BA addbit map indicates an error reception state when BA Bitmap is 0 with 1 bit, and when the bit is 1, the decoding failure of the data frame is indicated, the bit is 0, indicating that the data frame is not received.
Fig. 9 is a schematic diagram of an ML-BA frame structure that can be adopted by the second Multi-MAC MLO architecture according to this embodiment, where the specific BA Type subfield bit value is 3, indicating that the ML-BA frame Type is Multi-TID BA. The difference from the Compressed BA type ML-BA is the different indication manner of the Link Value subfield. The block acknowledgement information field segment in the type BA frame defined in the protocol contains a Per TID Info subfield which can be redefined as a Per TID LID Info subfield after the Link Value subfield is defined with the Reserved field therein.
Fig. 10 shows an ML-BA frame structure that can be adopted by the Multi-STA BA with a specific BA Type subfield bit value of 11 and an ML-BA frame Type under the third Multi-MAC MLO architecture of this embodiment. The difference from the Compressed BA type ML-BA is also that the Link Value subfield is indicated differently. The block acknowledgement information field segment in the type BA frame is defined to contain a Per AID TID Info subfield in the protocol, and after the subfield is extended to add a Link Value subfield, it can be redefined as a Per AID TID LID Info subfield.
The link information indication method newly added in the ML-BA frame by adding, using the Reserved field definition or by extending the original field includes, but is not limited to, the above-described embodiments.
Fig. 11 is a schematic diagram of an ML-BA frame structure that is used for indicating that the ML-BA frame Type is Multi-TID BA, with a specific BA Type subfield bit value of 3, in a single MAC MLO architecture of this embodiment. The indication mode of the receiving state information of each MDPU in the a-MPDU transmitted on multiple links is the same as that in the BA frame under the multi-MAC MLO architecture. Since there is only a single MAC address, successfully received data frames on multiple links may not distinguish between link sequence numbers, whereas erroneously received data frames need to indicate link sequence numbers to achieve the purpose of better indicating retransmission links/policies. Therefore, a Single-MAC BA addbmap subfield is added after the BA Bitmap subfield in each block acknowledgement information field segment to indicate whether the receiving status of the data frame error is decoding failure or not, and the link information corresponding to the data frame with the received error. According to the difference of the number of links, the number of coding bits required for the link information of the MPDU corresponding to the reception error is different in the Single-MAC BA AddBitmap sub-field, so that the Reserved field in the BA Control field is utilized to add a AddBitmap Link Coding Granularity sub-field to indicate the coding granularity of the link information of the MPDU corresponding to the difference of the number of links in the Single-MAC BA AddBitmap sub-field. The AddBitmap Link Coding Granularity subfield and Single-Link BA Indication subfield functions and detailed definitions are set forth below:
1.AddBitmap Link Coding Granularity subfields
This field is used to indicate the number of coding bits required for MPDU link information corresponding to a reception error in the Single-MAC BA addbits subfield, and the field length is 2 bits. The number of coding bits required for MPDU link information corresponding to a reception error= AddBitmap Link Coding Granularity subfield takes a value of +1. If the Multi-Link BA Indication subfield value is 0, it is indicated that the receiving device is not suitable to transmit the ML-BA frame without indicating the number of encoding bits of the link information through this field.
Single-MAC BA AddBItmap subfield
When the Multi-Link BA Indication subfield value is 1, that is, the receiving device is suitable for sending the ML-BA frame, the Single-MAC BA addbmap subfield is newly added after the original BA Bitmap subfield. The field indicates whether the receiving state of the data frame error in the BA Bitmap subfield is failed in decoding or the data frame is not received in a bit pattern mode, and the length of the field is variable. The AddBitmap Link Coding Granularity subfield value+2 bits in the Single-MAC BA AddBitmap subfield indicates error receiving status information and link information of the MPDU of 1 BA Bitmap corresponding to the receiving error, and the field is shown in fig. 12 as a sequential Bitmap sequence coding schematic diagram, in which the AddBitmap Link Coding Granularity subfield value=1. Wherein the 1 st bit indicates the reception status information of the corresponding erroneous MPDU, and when the bit value of 1 indicates that the decoding of the data frame fails, the bit value of 0 indicates that the data frame is not actually received. The subsequent bits indicate the link sequence number of the corresponding erroneous MPDU, and when the AddBitmap Link Coding Granularity subfield value takes the maximum value=3, it may indicate the sequence number of at most 16 different links. If the Multi-Link BA Indication subfield value is 0, when the receiving device is not suitable for transmitting the ML-BA frame, the receiving device may indicate the receiving status information of the corresponding receiving error MPDU with one bit in the Single-MAC BA addbit subfield.

Claims (6)

1. The multi-link transmission indication method is characterized in that for uplink and downlink multi-link communication scenes, when a multi-link data transmitting terminal transmits A-MPDUs to the same data receiving terminal through a plurality of links, the data receiving terminal carries A-MPDU block acknowledgement information of a plurality of links in one multi-link BA frame; transmitting a multi-link BA frame indicating whether each MDPU in each A-MPDU on a plurality of links is correctly received or simultaneously and redundantly transmitting a plurality of link BA frames on a plurality of links so as to improve the transmission reliability of the BA frames; meanwhile, after the block acknowledgement field indicating that each MDPU receives or fails correctly, a variable-length field indicating MPDU receiving failure type is added to distinguish data frame decoding failure from data frame loss state information.
2. The method of claim 1, wherein when the multi-link data transmitting end indicates that the data receiving end simultaneously transmits, on one link or a plurality of links, a multi-link BA frame indicating whether each MDPU in the a-MPDU transmitted on the plurality of links is correctly received, the multi-link BAR frame needs to be transmitted, and indicates, through the multi-link block acknowledgement frame redundancy transmission indication field, whether the data receiving end needs to repeatedly transmit the multi-link BA frame on the plurality of links.
3. The method of claim 2, wherein the BAR frame includes a multi-link block acknowledgement request indication field for indicating whether each a-MPDU block acknowledgement information reply on a plurality of links can be completed on one link, and a multi-link block acknowledgement frame redundancy transmission indication field for indicating whether a receiving device repeatedly transmits a multi-link BA frame on a plurality of links.
4. The method of claim 1, wherein when the multi-link device in the multi-link transmission scenario is a multi-MAC MLO architecture, the adopted multi-link BA frame carries a plurality of block acknowledgement information bit maps corresponding to each link and link information corresponding to the link block acknowledgement bit maps, and adds a bit map for explaining the reception failure type of each MPDU after the block acknowledgement bit maps;
the multilink equipment sends a multilink BA frame which comprises a multilink block acknowledgement indication field, a corresponding link block acknowledgement bitmap link sequence number field and an additional bitmap field of a corresponding MPDU receiving failure type in a block acknowledgement bitmap; the multi-link block acknowledgement indication field is used for indicating whether the acknowledgement information reply of each A-MPDU block on a plurality of links is completed on one link; the link number field of the corresponding link block acknowledgement bitmap is used for indicating the link information corresponding to the block acknowledgement bitmap; the bitmap field in the block acknowledgement bitmap, which corresponds to the type of MPDU reception failure, is used to indicate whether the reception status of a data frame error is decoding failure or the ability to not receive the data frame.
5. The method of claim 1, wherein when the multi-link device in the multi-link transmission scenario is a single MAC MLO architecture, the adopted multi-link BA frame carries a bitmap including a plurality of link block acknowledgement information, and adds a bitmap indicating a reception failure type of each MPDU and link information corresponding to the reception failure MPDU after the block acknowledgement bitmap, wherein the number of bits required for the link information is determined by specific link information coding granularity indication information;
the multilink equipment sends a multilink BA frame which comprises a multilink block acknowledgement indication field, an additional bitmap link information coding granularity field and an additional bitmap field corresponding to the MPDU receiving failure type and the link sequence number corresponding to the receiving failure MPDU in the block acknowledgement bitmap; the multi-link block acknowledgement indication field is used for indicating whether the acknowledgement information reply of each A-MPDU block on a plurality of links is completed on one link; the additional bitmap link information encoding granularity field is used for indicating the encoding bit number required by corresponding MPDU link information in the additional bitmap; the additional bitmap field in the block acknowledgement bitmap, which corresponds to the type of MPDU reception failure and the link sequence number corresponding to the MPDU reception failure, is used to indicate whether the reception status of the data frame error is decoding failure or the capability of not receiving the data frame, and the link information corresponding to the erroneous data frame.
6. A multilink transmission indicating system, characterized in that the application of a multilink transmission indicating method according to any one of claims 1 to 5 comprises an access point and a station in a multilink communication scenario; both stations and access points can operate on multiple links and become data transmitting or receiving ends; the data transmitting terminal transmits data to the data receiving terminal on a plurality of links within a preset data transmission opportunity time, and the data transmitting terminal transmits a multi-link type block acknowledgement request frame to the data receiving terminal on a specific link after the data transmission of the plurality of links is completed; the data receiving end only sends the multi-link type block acknowledgement frame simultaneously comprising a plurality of link data receiving states on one specific link, or sends the multi-link type block acknowledgement frame simultaneously in a redundancy way on a plurality of links; in the multi-link type block acknowledgement frame, different link information indication methods are provided according to the multi-link device architecture, and information about the status type capability of data frame error reception is carried after the block acknowledgement information.
CN202310408277.7A 2023-04-17 2023-04-17 Multilink transmission indication method and system Pending CN116419432A (en)

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