WO2022149316A1 - 基地局、通信装置及び通信方法 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- 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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
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- H04W72/12—Wireless traffic scheduling
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- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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- H—ELECTRICITY
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- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- This disclosure relates to base stations, communication devices and communication methods.
- IEEE 802.11ax Next-generation wireless local area networks
- LAN Local Area Network
- IEEE802.ax is also called High Efficiency (HE)
- EHT Extream High Throughput
- IEEE 802.11-20 / 0566r99 Compendium of straw polls and potential changes to the Specification Framework Document IEEE 802.11-19 / 1533r0, Consideration on Multi-AP Ack Protocol IEEE 802.11-20 / 0590r5, Coordinated Spatial Reuse: Focus on Downlink IEEE P802.11axTM / D8.0 IEEE P802.11-REVmdTM / D5.0
- the non-limiting examples of the present disclosure contribute to the provision of a base station, a communication device, and a communication method capable of improving the efficiency of retransmission control in cooperative communication.
- the base station includes a receiving circuit for receiving control information regarding sharing of a response signal for a downlink signal in coordinated communication between base stations, and another base station of the response signal based on the control information. It is provided with a control circuit for controlling transmission to.
- the efficiency of retransmission control in cooperative communication can be improved.
- Figure showing an example of MAP control sequence A block diagram showing a configuration example of a part of the AP according to the first embodiment.
- Block diagram showing a configuration example of AP according to the first embodiment Block diagram showing a configuration example of STA according to the first embodiment
- Figure showing an example of Block ACK (BA) request frame A diagram showing an example of defining a BA request in the Frame Control field.
- BA Block ACK
- Diagram showing a definition example of BA sharing in BlockAckframevariant The figure which shows an example of the control sequence of MAP which concerns on Embodiment 2.
- Diagram showing a definition example of BA sharing in BlockAckframevariant The figure which shows an example of the control sequence of MAP which concerns on Embodiment 3.
- a diagram showing a configuration example of a MAP trigger frame A diagram showing a configuration example of a MAP trigger frame Diagram showing an example of BA shared frame A diagram showing an example of defining a BA share in the Frame Control field.
- Diagram showing a definition example of BA sharing in BlockAckframevariant The figure which shows an example of the control sequence of MAP which concerns on Embodiment 4.
- a diagram showing a configuration example of a MAP trigger frame Diagram showing an example of line configuration between Shared APs The figure which shows an example of the control sequence of MAP which concerns on Embodiment 5.
- Multi-Access Point coordination In 11be, for example, a plurality of access points (AP: Access Point, or also referred to as “base station”) cooperate with each terminal (STA: Station, or also referred to as “non-AP STA”).
- AP Access Point
- STA Station
- non-AP STA Station
- MAP Multi-AP
- Coordinatd communication Coordinated communication between base stations
- JT Joint Transmissions
- MAP coordination schemes also referred to as “communication type” or “MAP type”
- JT includes, for example, a method of transmitting the same signal from a plurality of cooperating APs and a method of transmitting a different transmission stream from a plurality of cooperating APs.
- a method of transmitting different transmission streams from a plurality of cooperating APs is called, for example, Distributed MultiUser-MultipleInputMultipleOutput (D-MIMO).
- D-MIMO Distributed MultiUser-MultipleInputMultipleOutput
- IEEE 802.11 defines an Acknowledgment (ACK) frame as an acknowledgment signal for Quality of Service (QoS) data and a BlockAck frame that collectively returns responses to multiple frames (for example). , Non-Patent Document 4 or 5).
- FIG. 1 is a diagram showing a configuration example (MAP configuration example) of AP and STA that perform cooperative communication.
- the “Sharing AP” may be, for example, an AP that acquires a channel use (or transmission) period (for example, TXOP: transmission opportunity) and starts (or controls) cooperative communication.
- the "Shared AP” may be an AP instructed to perform cooperative communication by the Sharing AP.
- FIG. 1 shows a configuration in which any of the Shared APs (for example, AP1) also serves as a Sharing AP, but the configuration is not limited to this, and the Sharing AP and the Shared AP may be different APs.
- the STA a is associated with the Sharing AP (AP1) (may be referred to as “connection”), and cooperative communication is performed between the Sharing AP (AP1) and the Shared AP (AP2). conduct.
- the STA b is associated with the Shared AP (AP2) and performs cooperative communication between the Sharing AP (AP1), the Shared AP (AP2), and the Shared AP (AP3).
- the STA receives downlink data from the AP to the STA, and sends an ACK or a block ACK to the AP to which the STA is associated. Further, for example, when the MAP coordination scheme is JT, it is expected that an ACK or a block ACK is exchanged between Shared APs (see, for example, Non-Patent Document 2).
- FIG. 2 is a diagram showing an example of a communication environment in which coverage (communicable range) differs between a downlink and an uplink.
- the connection relationship between AP1, AP2, AP3, STA a and STA b shown in FIG. 2 may be the same as the connection relationship between AP and STA shown in FIG.
- Sharing AP AP1
- Shared AP AP2
- Sharing AP AP1
- Shared AP AP2
- Sharing AP exists within the coverage of each downlink of Sharing AP (AP1), Shared AP (AP2) and Shared AP (AP3).
- the Shared AP (AP2) and the Shared AP (AP3) exist in the STAb uplink coverage, but the Sharing AP (AP1) is out of the STAb uplink coverage. Therefore, Sharing AP (AP1), Shared AP (AP2), and Shared AP (AP3) may not receive (for example, simultaneously receive) a response from STAb (for example, ACK or block ACK for downlink data).
- STAb for example, ACK or block ACK for downlink data.
- Sharing AP (AP1) may not receive an ACK or block ACK from STAb.
- FIG. 3 is a diagram showing an example of a MAP control sequence in the communication environment shown in FIG.
- the Sharing AP transmits a MAP trigger frame (also referred to as a MAP Announcement frame), which is a trigger for starting data transmission related to the MAP, to the Shared AP (AP2 and AP3).
- a MAP trigger frame also referred to as a MAP Announcement frame
- the Sharing AP (AP1) and the Shared AP (AP2 and AP3) may simultaneously transmit data (for example, initial transmission data).
- STAa and STAb receive data from each AP and transmit ACK or block ACK (represented as “BA” in the example of FIG. 3) indicating the success or failure of reception (or decoding) to each AP (represented as “BA” in the example of FIG. 3). Or give feedback).
- the Sharing AP (AP1) is out of the coverage of the uplink of STAb
- the ACK or block ACK transmitted from STAb is An example that does not reach Sharing AP (AP1) is shown. Since the Sharing AP (AP1) does not receive the ACK or block ACK from STAb, it may decide to retransmit the data, for example. In this way, even though STAb has received the data normally, useless retransmission may occur.
- FIG. 4 is a diagram showing an example of a control sequence of the retransmission phase following the operation shown in FIG.
- the Sharing AP transmits a MAP trigger frame to the Shared AP (AP2 and AP3) even at the time of retransmission.
- the Sharing AP (AP1) and the Shared AP (AP2, AP3) may simultaneously transmit data (for example, retransmission data).
- a method for improving the efficiency of retransmission control during MAP operation will be described. For example, by providing a "shared phase (or BA sharing phase)" in which an AP receives an ACK or block ACK from each STA and then shares the ACK or block ACK, the ACK or block ACK is provided in the Sharing AP and the Shared AP. Share.
- phase may be read as another term such as “period”, “sequence” or “procedure”.
- the wireless communication system may include a plurality of AP100s and STA200s.
- the AP100 may have both the functions of a Sharing AP and a Shared AP, for example, or may have either of the functions.
- FIG. 5 is a block diagram showing a partial configuration example of the AP100 according to the embodiment of the present disclosure.
- the radio transmission / reception unit 105 controls the sharing of the response signal (for example, ACK or block ACK) for the downlink signal in the coordinated communication between base stations (for example, MAP coordination).
- Receive information for example, ACK or block ACK
- the control unit 101 controls transmission of the response signal to another base station based on the control information.
- FIG. 6 is a block diagram showing a configuration example of the AP100.
- the AP100 shown in FIG. 6 includes, for example, a control unit 101, a control signal generation unit 102 for STA, a control signal generation unit 103 for AP, a transmission signal generation unit 104, a wireless transmission / reception unit 105, and reception signal demodulation / decoding. Section 106 and may be included.
- the control unit 101 may control, for example, the setting of the MAP Trigger frame. For example, when the AP100 is a Sharing AP, the control unit 101 may control the generation of a control signal (for example, a MAP Trigger frame) for another AP100 (for example, a Shared AP). Further, the control unit 101 may control the sharing of ACK or block ACK, for example. For example, the control unit 101 shares the ACK or block ACK from each STA200 with another AP100 based on the control information for controlling the sharing of the ACK or block ACK input from the received signal demodulation / decoding unit 106. You may decide whether or not.
- control unit 101 may set control information for, for example, the STA200 or another AP100.
- control unit 101 may set resource allocation information for each STA 200 and scheduling information such as MCS.
- control unit 101 is, for example, based on the information input from the received signal demodulation / decoding unit 106 (for example, the control information notified from the Sharing AP to the Shared AP), and the parameters related to the transmission control (for example, the above-mentioned cooperation). Communication parameters) may be determined.
- the control unit 101 may output, for example, control information including the determined transmission control parameter to the control signal generation unit 102 for STA and the control signal generation unit 103 for AP.
- the control signal generation unit 102 for STA may generate, for example, a control signal for STA200 (for example, Trigger frame) and output the generated control signal to the transmission signal generation unit 104.
- a control signal for STA200 for example, Trigger frame
- the control signal generation unit 103 for AP may generate a control signal for AP100, for example.
- the control signal for the AP100 may include, for example, a MAP Trigger frame or a control frame for sharing an ACK or block ACK.
- the control signal generation unit 103 for AP may generate a control signal based on the control information input from the control unit 101 and the information input from the received signal demodulation / decoding unit 106.
- the control signal generation unit 103 for AP outputs, for example, the generated control signal to the transmission signal generation unit 104.
- the transmission signal generation unit 104 performs transmission processing on the control signal, data, and ACK / block ACK input from, for example, the control signal generation unit 102 for STA or the control signal generation unit 103 for AP, and the wireless frame. (Transmission signal) may be generated.
- the transmission signal generation unit 104 outputs the generated transmission signal to the wireless transmission / reception unit 105.
- the wireless transmission / reception unit 105 performs wireless transmission processing such as D / A conversion and up-conversion to the carrier frequency on the transmission signal input from the transmission signal generation unit 104, and the signal after the wireless transmission processing is used as an antenna. Send via.
- the AP100 may operate as follows, for example, when receiving an uplink signal transmitted from the STA200 or a control signal transmitted from another AP100.
- the wireless signal received via the antenna is input to the wireless transmission / reception unit 105.
- the wireless transmission / reception unit 105 performs wireless reception processing such as down-conversion of the carrier frequency on the received wireless signal, and outputs the signal after the wireless reception processing to the reception signal demodulation / decoding unit 106.
- the received signal demodulation / decoding unit 106 may perform processing such as autocorrelation processing on the signal input from the wireless transmission / reception unit 105 to extract the received wireless frame. Further, the received signal demodulation / decoding unit 106 may, for example, include an uplink signal (for example, a response signal or feedback information) from the STA200 included in the extracted wireless frame, or a control signal (for example, MAP) from another AP100. Trigger frames, or control frames for sharing ACKs or block ACKs) may be decoded and demodulated. The received signal demodulation / decoding unit 106 may output the demodulated control signal to the control unit 101, the control signal generation unit 102 for STA, and the control signal generation unit 103 for AP, for example.
- an uplink signal for example, a response signal or feedback information
- a control signal for example, MAP
- Trigger frames, or control frames for sharing ACKs or block ACKs may be decoded and demodulated.
- FIG. 7 is a block diagram showing a configuration example of the STA 200 according to the present embodiment.
- the STA 200 shown in FIG. 7 may include, for example, a wireless transmission / reception unit 201, a reception signal demodulation / decoding unit 202, and a transmission signal generation unit 203.
- the wireless transmission / reception unit 201 receives the signal transmitted from the AP100 via the antenna, performs wireless reception processing such as down-conversion and A / D conversion to the received signal, and receives the signal after the wireless reception processing. Output to the demodulation / decoding unit 202. Further, the wireless transmission / reception unit 201 performs wireless transmission processing such as D / A conversion and up-conversion to the carrier frequency on the signal input from the transmission signal generation unit 203, and displays the signal after the wireless transmission processing. It may be transmitted via an antenna.
- the received signal demodulation / decoding unit 202 may perform processing such as autocorrelation processing on the signal input from the wireless transmission / reception unit 201 to extract the received wireless frame.
- the received signal demodulation / decoding unit 202 may, for example, demodulate and decode a control signal (for example, Trigger frame) included in the extracted wireless frame, and acquire uplink transmission control parameters.
- the received signal demodulation / decoding unit 202 may output, for example, the acquired uplink transmission control parameter to the transmission signal generation unit 203.
- the transmission signal generation unit 203 performs transmission signal processing on the uplink signal (for example, ACK or block ACK for the downlink signal) based on the uplink transmission control parameter input from the reception signal demodulation / decoding unit 202, for example. This may be done to generate a radio frame (transmission signal).
- the transmission signal generation unit 203 outputs, for example, the generated transmission signal to the wireless transmission / reception unit 201.
- an AP that controls sharing of ACK or block ACK is defined as "BA control AP".
- the BA control AP may control the sharing of the ACK or the block ACK in the Sharing AP and the Shared AP by aggregating the information regarding the ACK or the block ACK.
- a Sharing AP may be set in the BA control AP, or a Shared AP capable of receiving an ACK or a block ACK transmitted from the STA200 under the MAP may be set (or defined). Further, for example, the BA control AP may be set (defined or changed) periodically or irregularly. As a result, the BA control AP is set according to the propagation environment, which enables adaptive optimization of retransmission control.
- control steps (A), (B) and (C) may be provided in the BA sharing phase after the process in which each STA200 transmits an ACK or a block ACK.
- step may be read as other terms such as “process” and "procedure”.
- the frame requests the BA control AP for the ACK or the block ACK (or requests the BA sharing) (hereinafter referred to as "BA request frame"). To send.
- BA control AP When the BA control AP receives a BA request frame, it transmits a frame instructing BA sharing (for example, called a "BA sharing request frame") to each Shared AP.
- a BA sharing request frame a frame instructing BA sharing
- the Shared AP When the Shared AP receives the BA share request frame, it transmits a frame containing an ACK or a block ACK held (for example, received) by the Shared AP (for example, referred to as a "BA shared frame").
- the TXOP (channel usage period) may be set, for example, in the MAP trigger frame, which is a trigger for starting MAP data transmission, and the TXOP includes BA sharing including the above-mentioned control steps (A) to (C). Phases may be included.
- FIG. 8 is a diagram showing an example of a MAP control sequence according to the present embodiment.
- FIG. 8 is a diagram showing an example of a MAP control sequence in the communication environment shown in FIG. 2, as in FIG.
- the ACK or block ACK for the data transmitted from the Sharing AP (AP1) and the Shared AP (AP2, AP3) (for example, the initial transmission data) is ACKed from STAb to Sharing AP (AP1).
- An example is shown in which the block ACK does not reach.
- Shared AP which is an AP capable of receiving ACK or block ACK from both STA a and STA b, may be set (or defined) as a BA control AP.
- the BA control AP may be specified in the MAP trigger frame, which is the trigger to start MAP data transmission, or may be set in the MAP setup or channel estimation phase before the MAP trigger frame. good.
- the Sharing AP (AP1) that does not receive the ACK or the block ACK may transmit the BA request frame to the Shared AP (AP2) that is the BA control AP.
- the Shared AP which is a BA control AP
- AP1 a BA sharing AP
- BA sharing request frame may be transmitted to (eg, AP1 and AP3) instructing BA sharing (eg, transmission of an ACK or block ACK to AP1).
- the Shared AP (AP3) that received the BA share request frame from the BA control AP, or the Shared AP (AP2) that is the BA control AP becomes the BA share request frame.
- BA shared frames may be sent based on.
- the Shared AP (AP2 and AP3) that received the ACK or the block ACK from STAb sets the BA shared frame for the Sharing AP (AP1) that does not receive the ACK or the block ACK.
- AP1, AP2 and AP3 share an ACK or block ACK from STAb.
- the Sharing AP does not receive the ACK or block ACK of STAb from STAb, it receives it from another Shared AP to appropriately control the retransmission to STAb.
- the Sharing AP confirms (or recognizes) that the downlink data transmitted to the STA b has been normally received by the STA b. Therefore, for example, as shown in FIG. 8, the Sharing AP (AP1) and the Shared AP (AP2, AP3) may simultaneously transmit data (for example, new transmission data) in the next TXOP.
- the AP that controls the sharing of the ACK or the block ACK is defined as the BA control AP, and the information on the ACK or the block ACK is aggregated in the BA control AP, and then the AP100 is the Sharing AP and the Sharing AP.
- Controls sharing of ACK or block ACK for Shared AP By this control, the Sharing AP and the Shared AP can share the ACK or block ACK information of each STA200 under the MAP, and unnecessary retransmission can be suppressed.
- the BA request frame transmitted / received in the control step (A) may be configured to include, for example, an address field of a Shared AP (AP1 which is a Sharing AP in FIG. 8) that does not receive an ACK or a block ACK.
- AP1 which is a Sharing AP in FIG. 8
- FIG. 9 is a diagram showing a configuration example of a BA request (BA Req) frame.
- the BA request frame includes, for example, an address (for example, BAReqAddress) of a Shared AP that does not receive an ACK or a block ACK (in other words, an AP that transmits the BA request frame).
- an address for example, BAReqAddress
- the address may be, for example, an AP100 Medium Access Control (MAC) address or a virtual Basic Service Set (BBS) (basic service set) address.
- MAC Medium Access Control
- BSS Basic Service Set
- ID one identifier
- AP100s to be operated by the MAP
- a plurality of IDs may be assigned within the range of a specific ID.
- the "frame type" that specifies that the wireless frame is a BA request frame may be based on, for example, at least one of the following definitions (or settings).
- -Type value and Subtype value in the Frame Control field ⁇ Trigger frame type -BlockAckReq frame frame variant
- FIG. 10 is a diagram showing an example in which a frame type is specified by the Type value and Subtype value of the Frame Control field in the BA request frame shown in FIG.
- a BA request (BA Req) is made to “0000” which is an unused Subtype value (for example, Reserved) in 11ax (for example, the Control type of Table 9-1 Valid type and subtype combinations of 11ax specifications).
- 0000 is an unused Subtype value (for example, Reserved) in 11ax (for example, the Control type of Table 9-1 Valid type and subtype combinations of 11ax specifications).
- 11ax for example, the Control type of Table 9-1 Valid type and subtype combinations of 11ax specifications.
- FIG. 10 shows an example in which the type of the BA request frame is defined as “0000”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 11 is a diagram showing an example in which the type of the BA request frame (for example, TriggerType) is specified by the Type subfield of the Trigger frame when the Trigger frame is used as the BA request frame.
- the BA request frame type (BA Req) is set to “8” which is an unused Trigger Type subfield value (for example, Reserved) in 11ax (for example, Table 9-29c Trigger Type subfield encoding of 11ax specification). ) Is an example defined. Note that FIG. 11 shows an example in which the type of the BA request frame is defined as “8”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 12 shows an example in which when a block ACK request (BlockAckReq) frame is used as the BA request frame, the type of the BA request frame (for example, the block ACK request (BAR) type) is specified by the frame variant of the BlockAckReq frame.
- the BA request frame type (BA Req) is set to “7” which is an unused BlockAckReq frame variant (for example, Reserved) in 11ax (for example, Table 9-28 BlockAckReq frame variant encoding of 11ax specification).
- FIG. 12 shows an example in which the type of the BA request frame is defined as “7”, but the present invention is not limited to this, and other unused values may be defined.
- BA shared request frame (control step (B))>
- the BA shared request frame transmitted / received in the control step (B) may be configured to include, for example, an address field of a Sharing AP or a Shared AP (AP1 in the example of FIG. 8) requesting an ACK or a block ACK.
- FIG. 13 is a diagram showing a configuration example of a BA share request (BA ShareReq) frame.
- the BA share request frame includes, for example, the address (for example, BAShareReqAddress) of a Sharing AP or a Shared AP requesting an ACK or a block ACK (for example, an AP requesting the sharing of an ACK or a block ACK). ) May be included.
- the address (BAShareReqAddress) included in the BA share request frame may include the address (BAReqAddress) in the BA request frame sent and received in the control step (A).
- the frame type that specifies that the wireless frame is a BA sharing request frame may be based on, for example, at least one of the following definitions (or settings).
- -Type value and Subtype value in the Frame Control field may be based on, for example, at least one of the following definitions (or settings).
- FIG. 14 is a diagram showing an example in which a frame type is specified by the Type value and Subtype value of the Frame Control field in the BA sharing request frame shown in FIG.
- a BA share request (BAShareReq) is set to “0001”, which is an unused Subtype value (for example, Reserved) in 11ax (for example, Table 9-1 Valid type and subtype combinations Control type of 11ax specification).
- This is an example in which the type of frame is defined.
- FIG. 14 shows an example in which the type of the BA sharing request frame is defined as “0001”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 15 is a diagram showing an example in which the type of the BA sharing request frame (for example, TriggerType) is specified by the Type subfield of the Trigger frame when the Trigger frame is used as the BA sharing request frame.
- a BA share request (BAShareReq) frame is set to “9” which is an unused Trigger Type subfield value (for example, Reserved) in 11ax (for example, Table 9-29c Trigger Type subfield encoding of 11ax specification).
- This is an example in which the type of is defined.
- FIG. 15 shows an example in which the type of the BA sharing request frame is defined as “9”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 16 is a diagram showing an example in which when a BlockAckReq frame is used as a BA sharing request frame, the type of the BA sharing request frame (for example, BAR type) is specified by the frame variant of the BlockAckReq frame.
- the BA share request (BAShareReq) frame is set to “8” which is an unused BlockAckReqframe variant (for example, Reserved) in 11ax (for example, Table 9-28 BlockAckReq frame variant encoding of 11ax specification).
- This is an example in which the type is defined.
- FIG. 16 shows an example in which the type of the BA sharing request frame is defined as “8”, but the present invention is not limited to this, and other unused values may be defined.
- the BA shared frame transmitted / received in the control step (C) may be configured to include, for example, information regarding ACK or block ACK.
- FIG. 17 is a diagram showing a configuration example of a BA share frame.
- the Block Ack Bitmap field included in the BA shared frame shown in FIG. 17 may include a bitmap composed of ACK / NACK information of each retransmission unit such as each MAC Protocol Data Unit (MPDU) or Codeword. Further, for example, when the information fed back from the STA200 to the AP100 is ACK (in other words, when NACK is not included), if the BA shared frame can be identified by the frame type described later, the BA shared frame can be used. , BlockAck Bitmap field does not have to be included.
- MPDU MAC Protocol Data Unit
- the frame type that specifies that the wireless frame is a BA shared frame may be based on, for example, at least one of the following definitions (or settings).
- FIG. 18 is a diagram showing an example in which a frame type is specified by the Type value and Subtype value of the Frame Control field in the BA shared frame shown in FIG.
- BA sharing BAShare
- 1111 which is an unused Subtype value (for example, Reserved) in 11ax (for example, Control type of Table 9-1 Valid type and subtype combinations of 11ax specification).
- 11ax for example, Control type of Table 9-1 Valid type and subtype combinations of 11ax specification.
- FIG. 18 shows an example in which the type of the BA shared frame is defined as “1111”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 19 is a diagram showing an example in which when a block ACK (BlockAck) frame is used as a BA shared frame, the type of the BA shared frame (for example, BlockAck (BA) type) is specified by the frame variant of the BlockAck frame. ..
- the type of BA share (BA Share) frame is set to “4” which is an unused BlockAckReqframe variant (for example, Reserved) in 11ax (for example, Table 9-28 BlockAck frame variant encoding of 11ax specification).
- FIG. 19 shows an example in which the type of the BA shared frame is defined as “4”, but the present invention is not limited to this, and other unused values may be defined.
- the AP100 receives the control information (radio frame) regarding the sharing of the ACK or the block ACK for the downlink signal in the coordinated communication between the base stations, and ACKs or blocks based on the received control information. Controls the transmission of ACKs to other APs.
- the AP100 which is a BA control AP
- the AP100 is a base involved in coordinated communication between base stations when the control information received from another AP (for example, a BA request frame) indicates an ACK or block ACK request. Instructs an AP different from the other AP (AP that transmits the BA request frame) in the station to transmit an ACK or a block ACK to the other AP (in other words, sharing an ACK or a block ACK). Request).
- the AP 100 different from the BA control AP indicates that the received control information (for example, the BA sharing request frame) requests the sharing of the ACK or the block ACK, it is indicated in the control information. Determines the transmission of an ACK or block ACK (eg, BA shared frame) to other APs.
- the ACK or block ACK from the STA200 under the MAP is shared by a plurality of AP100s (for example, Sharing AP and Shared AP). Therefore, for example, even if the AP100 does not receive the ACK or the block ACK from the STA200, the ACK or the block ACK is acquired by sharing the ACK or the block ACK by another AP100, so that an appropriate determination regarding the necessity of retransmission is made. Is possible. Therefore, according to the present embodiment, it is possible to suppress unnecessary retransmission in the AP100 in cooperative communication and improve the efficiency of retransmission control in cooperative communication.
- AP100s for example, Sharing AP and Shared AP
- the BA request frame may include the address of the STA200 that transmitted the ACK or the block ACK in addition to the address of the AP100 that does not receive the ACK or the block ACK.
- the ACK or block ACK shared by the plurality of AP100s is set to the ACK or block ACK that the AP100 that transmitted the BA request frame does not receive, and the other ACKs or block ACKs do not have to be shared. Overhead in shared control can be reduced.
- AP100 which is a BA control AP
- AP100 individually controls the sharing of the ACK or the block ACK. For example, if the AP100 does not receive an ACK or block ACK from the STA200, the AP100 may individually request another AP100 to share the ACK or block ACK.
- control steps (A) and (B) may be provided in the BA sharing phase after the process in which each STA200 transmits an ACK or a block ACK.
- the TXOP (channel usage period) may be set in the MAP trigger frame, which is a trigger for starting MAP data transmission, and the TXOP has a BA sharing phase including the above-mentioned control steps (A) and (B). May be included.
- FIG. 20 is a diagram showing an example of a MAP control sequence according to the present embodiment.
- FIG. 20 is a diagram showing an example of a MAP control sequence in the communication environment shown in FIG. 2, as in FIG.
- the ACK or block ACK for the data transmitted from the Sharing AP (AP1) and the Shared AP (AP2, AP3) (for example, the initial transmission data) is ACKed from STAb to Sharing AP (AP1).
- An example is shown in which the block ACK does not reach.
- the Sharing AP (AP1) that does not receive the ACK or the block ACK from the STA b transmits a BA share request frame to the Shared AP (AP2) to which the STA b is associated. You can do it.
- the Shared AP (AP2) that has received the BA share request frame from the Sharing AP (AP1) is directed to the Sharing AP (AP1) based on the BA share request frame.
- BA shared frames may be sent.
- the Shared AP (AP2) to which the STA b is associated transmits a BA shared frame to the Sharing AP (AP1) that does not receive an ACK or a block ACK, and the STA b sends a BA shared frame. Notify the ACK or block ACK of. In other words, AP1 and AP2 share an ACK or block ACK from STAb.
- the Sharing AP does not receive the ACK or block ACK of STAb from STAb, it receives it from another Shared AP (AP2) to appropriately control the retransmission to STAb.
- the Sharing AP confirms (or recognizes) that the downlink data transmitted to the STA b has been normally received by the STA b. Therefore, for example, as shown in FIG. 20, the Sharing AP (AP1) and the Shared AP (AP2, AP3) may simultaneously transmit data (for example, new transmission data) in the next TXOP.
- the AP 100 does not receive the ACK or the block ACK.
- the AP 100 individually requests the sharing of the ACK or the block ACK, and controls the sharing of the ACK or the block ACK.
- the Sharing AP and the Shared AP can share the ACK or block ACK information from each STA200 under the MAP, and useless retransmission can be suppressed.
- the present embodiment as compared with the first embodiment, for example, there is no need to set the BA control AP and control steps of the BA request for the BA control AP, so that the overhead related to the shared control of the ACK is reduced. can.
- the BA shared request frame transmitted / received in the control step (A) may be configured to include, for example, the address field of the Sharing AP or the Shared AP (AP2 in the example of FIG. 20) to which the ACK or the block ACK is requested to be shared. ..
- FIG. 21 is a diagram showing a configuration example of a BA share request (BA ShareReq) frame.
- the BA sharing request frame includes, for example, the address (for example, BA) of the Sharing AP or Shared AP (for example, the AP requested to share the ACK or the block ACK) to which the ACK or the block ACK is requested.
- ShareReqAddress may be included at least one.
- the address (BAShareReqAddress) may be shared in the MAP trigger frame, which is a trigger for starting MAP data transmission, and is shared in the MAP setup or channel estimation phase prior to the MAP trigger frame. You may.
- the frame type that specifies that the wireless frame is a BA sharing request frame may be based on, for example, at least one of the following definitions (or settings).
- -Type value and Subtype value in the Frame Control field may be based on, for example, at least one of the following definitions (or settings).
- FIG. 22 is a diagram showing an example in which a frame type is specified by the Type value and Subtype value of the Frame Control field in the BA sharing request frame shown in FIG. 21.
- a BA share request (BAShareReq) is set to “0000” which is an unused Subtype value (for example, Reserved) in 11ax (for example, Table 9-1 Valid type and subtype combinations Control type of 11ax specification).
- This is an example in which the type of frame is defined.
- FIG. 22 shows an example in which the type of the BA sharing request frame is defined as “0000”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 23 is a diagram showing an example in which the type of the BA sharing request frame (for example, TriggerType) is specified by the Type subfield of the Trigger frame when the Trigger frame is used as the BA sharing request frame.
- a BA share request (BAShareReq) frame is set to “8” which is an unused Trigger Type subfield value (for example, Reserved) in 11ax (for example, Table 9-29c Trigger Type subfield encoding of 11ax specification).
- This is an example in which the type of is defined.
- FIG. 23 shows an example in which the type of the BA sharing request frame is defined as “8”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 24 is a diagram showing an example in which when a BlockAckReq frame is used as a BA sharing request frame, the type of the BA sharing request frame (for example, BAR type) is specified by the frame variant of the BlockAckReq frame.
- the BA share request (BAShareReq) frame is set to “7” which is an unused BlockAckReqframe variant (for example, Reserved) in 11ax (for example, Table 9-28 BlockAckReq frame variant encoding of 11ax specification).
- This is an example in which the type is defined.
- FIG. 24 shows an example in which the type of the BA sharing request frame is defined as “7”, but the present invention is not limited to this, and other unused values may be defined.
- the BA shared frame transmitted / received in the control step (B) may be configured to include information regarding ACK or block ACK, as in the case of the BA shared frame in the control step (C) of the first embodiment, for example.
- FIG. 25 is a diagram showing a configuration example of a BA share frame.
- the Block Ack Bitmap field included in the BA shared frame shown in FIG. 25 may include a bitmap composed of ACK / NACK information of the retransmission unit such as each MPDU or Codeword. Further, for example, when the information fed back from the STA200 to the AP100 is ACK (in other words, when NACK is not included), if the BA shared frame can be identified by the frame type described later, the BA shared frame can be used. , BlockAck Bitmap field does not have to be included.
- the frame type that specifies that the wireless frame is a BA shared frame may be based on, for example, at least one of the following definitions (or settings).
- FIG. 26 is a diagram showing an example in which a frame type is specified by the Type value and Subtype value of the Frame Control field in the BA shared frame shown in FIG. 25.
- BA sharing BAShare
- 0001 an unused Subtype value (for example, Reserved) in 11ax (for example, Control type of Table 9-1 Valid type and subtype combinations of 11ax specification).
- 11ax for example, Control type of Table 9-1 Valid type and subtype combinations of 11ax specification.
- FIG. 26 shows an example in which the type of the BA shared frame is defined as “0001”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 27 is a diagram showing an example in which when a block ACK (BlockAck) frame is used as a BA shared frame, the type of the BA shared frame (for example, BA type) is specified by the frame variant of the BlockAck frame.
- the type of BA share (BA Share) frame is set to “4” which is an unused BlockAckReqframe variant (for example, Reserved) in 11ax (for example, Table 9-28 BlockAck frame variant encoding of 11ax specification).
- FIG. 27 shows an example in which the type of the BA shared frame is defined as “4”, but the present invention is not limited to this, and other unused values may be defined.
- the AP100 receives the control information (radio frame) regarding the sharing of the ACK or the block ACK for the downlink signal in the coordinated communication between the base stations, and ACKs or blocks based on the received control information. Controls the transmission of ACKs to other APs.
- the AP 100 indicates that the control information received from another AP (for example, a BA sharing request frame) requests the sharing of the ACK or the block ACK of the STA 200 associated with the AP 100. , Determines the transmission of an ACK or block ACK to the other AP.
- the ACK or block ACK from the STA200 under the MAP is shared by a plurality of AP100s (for example, Sharing AP and Shared AP). Therefore, for example, even if the AP100 does not receive the ACK or the block ACK from the STA200, the ACK or the block ACK is acquired by sharing the ACK or the block ACK by another AP100, so that an appropriate determination regarding the necessity of retransmission is made. Is possible. Therefore, according to the present embodiment, it is possible to suppress unnecessary retransmission in the AP100 in cooperative communication and improve the efficiency of retransmission control in cooperative communication.
- AP100s for example, Sharing AP and Shared AP
- a method of specifying a Shared AP that requests sharing of an ACK or a block ACK will be described in the MAP trigger frame that is a trigger for starting MAP data transmission.
- control steps (A) and (B) may be provided in the MAP trigger frame and the BA sharing phase after the process in which each STA200 transmits an ACK or a block ACK.
- the Sharing AP specifies to the Shared AP a combination of the Shared AP that requests sharing of the ACK or the block ACK and the STA200 that transmits the ACK or the block ACK in the MAP trigger frame.
- the Shared AP transmits a BA shared frame including an ACK from STA200 included in the combination or a block ACK to the Shared AP included in the combination.
- the TXOP (channel usage period) may be set in the MAP trigger frame, which is a trigger for starting MAP data transmission, and the TXOP may include a BA sharing phase including the control step (B) described above. ..
- FIG. 28 is a diagram showing an example of a MAP control sequence according to the present embodiment.
- FIG. 28 is a diagram showing an example of a MAP control sequence in the communication environment shown in FIG. 2, as in FIG.
- an ACK or block ACK for data transmitted from Sharing AP (AP1) and Shared AP (AP2, AP3) (for example, initial transmission data) is ACKed from STAb to Sharing AP (AP1).
- An example is shown in which the block ACK does not reach.
- the Sharing AP (AP1) specifies a combination of the Shared AP that requests sharing of the ACK or the block ACK and the STA200 that transmits the ACK or the block ACK.
- the Sharing AP (AP1) may specify a combination of the AP100 and the STA200, which may not receive the ACK or the block ACK from the STA200.
- the Sharing AP (AP1) is an uplink of each STA200 based on the propagation loss or channel estimation value between each STA200 and each Shared AP collected in the Multi-AP Channel sounding phase performed before the MAP data transmission. You may determine the coverage of the link. Then, the Sharing AP (AP1) may determine, for example, a combination of the Shared AP existing outside the uplink coverage of each STA200 and the STA200. In the example of FIG. 28, for example, a combination of STA b and AP1 existing outside the coverage of the uplink of STA b may be specified.
- the AP100 determines the uplink coverage of each STA200 based on the propagation loss or the channel estimation value collected in the Multi-AP Channel sounding phase performed before the MAP data transmission.
- the above-mentioned combination may be determined periodically or irregularly.
- the combination of AP100 and STA200 is set (or changed) according to the propagation environment, so that the retransmission control can be adaptively optimized.
- the Shared AP (AP2) specified in the MAP Trigger frame of the control step (A) is a BA shared frame with respect to the Sharing AP (AP1) shown in the combination. May be sent.
- the Shared AP (AP2) in which the combination of AP1 and STAb is specified transmits a BA shared frame to the Sharing AP (AP1) that does not receive an ACK or a block ACK. And notify the ACK or block ACK from STAb.
- AP1 and AP2 share an ACK or block ACK from STAb.
- the Sharing AP does not receive the ACK or block ACK of STAb from STAb, it receives it from another Shared AP (AP2) to appropriately control the retransmission to STAb.
- the Sharing AP confirms (or recognizes) that the downlink data transmitted to the STA b has been normally received by the STA b. Therefore, for example, as shown in FIG. 28, the Sharing AP (AP1) and the Shared AP (AP2, AP3) may simultaneously transmit data (for example, new transmission data) in the next TXOP.
- the Sharing AP and the Shared AP can share the ACK or block ACK information from each STA200 under the MAP, and useless retransmission can be suppressed.
- the control step related to the setting of the BA control AP and the BA sharing request in the BA sharing phase can be eliminated, so that the overhead related to the sharing control of the ACK can be eliminated. Can be reduced.
- the MAP trigger frame transmitted / received in the control step (A) may be configured to include, for example, information about the STA 200 in which the ACK or the block ACK is shared in the information (for example, “Per AP Info”) field for each AP100.
- FIG. 29 is a diagram showing an example of the configuration of the MAP trigger frame.
- the BA share request (BAShareReq) field may be set in the information (PerAPInfo) field for each AP100 in the MAP trigger frame. Further, the BA sharing request field shown in FIG. 29 may include, for example, an identifier (ID) of the STA 200 in which the ACK or the block ACK is shared.
- ID an identifier
- the STAb ID may be set in the BAShareReq field in the PerAPInfo field corresponding to SharingAP (AP1).
- the MAC address (for example, 48 bits) may be used for the STAID, and the STA identifier called ShortID may be defined.
- the Short ID for example, it may be defined by being included in the Assosiation ID (AID) specified in the 11ax specification, or may be assigned to the Reserved of AID12. By using ShortID, overhead can be reduced compared to MAC address.
- FIG. 30 is a diagram showing another example of the configuration of the MAP trigger frame.
- the MAP trigger frame shares an ACK or a block ACK in the information (for example, PerSTAinfo) field for each STA200 included in the information (PerAPInfo) field for each AP100.
- Information indicating the above (for example, referred to as "BAShareFlag") may be set.
- the BA sharing flag may be, for example, 1-bit information indicating whether or not an ACK or a block ACK is shared.
- BAShareFlag indicates that ACK or block ACK is shared. good.
- the information regarding the combination of the AP100 and the STA200 is included in the information for each AP100 (PerAPInfo), but the present invention is not limited to this.
- Information about the combination of AP100 and STA200 may be defined in the Common info field of the MAP trigger frame. For example, information about a plurality of the above combinations may be collectively defined in the Common info field.
- the BA shared frame transmitted / received in the control step (B) may be configured to include information regarding ACK or block ACK, as in the case of the BA shared frame in the control step (C) of the first embodiment, for example.
- FIG. 31 is a diagram showing a configuration example of a BA share frame.
- the Block Ack Bitmap field included in the BA shared frame shown in FIG. 31 may include a bitmap composed of ACK / NACK information of the retransmission unit such as each MPDU or Codeword. Further, for example, when the information fed back from the STA200 to the AP100 is ACK (in other words, when NACK is not included), if the BA shared frame can be identified by the frame type described later, the BA shared frame can be used. , BlockAck Bitmap field does not have to be included.
- the frame type that specifies that the wireless frame is a BA shared frame may be based on, for example, at least one of the following definitions (or settings).
- FIG. 32 is a diagram showing an example in which a frame type is specified by the Type value and Subtype value of the Frame Control field in the BA shared frame shown in FIG. 31.
- BA sharing BAShare
- 0001 an unused Subtype value (for example, Reserved) in 11ax (for example, Control type of Table 9-1 Valid type and subtype combinations of 11ax specification).
- 11ax for example, Control type of Table 9-1 Valid type and subtype combinations of 11ax specification.
- FIG. 32 shows an example in which the type of the BA shared frame is defined as “0001”, but the present invention is not limited to this, and other unused values may be defined.
- FIG. 33 is a diagram showing an example in which when a block ACK (BlockAck) frame is used as the BA shared frame, the type of the BA shared frame (for example, BA type) is specified by the frame variant of the BlockAck frame.
- the type of BA share (BA Share) frame is set to “4” which is an unused BlockAckReqframe variant (for example, Reserved) in 11ax (for example, Table 9-28 BlockAck frame variant encoding of 11ax specification).
- FIG. 32 shows an example in which the type of the BA shared frame is defined as “4”, but the present invention is not limited to this, and other unused values may be defined.
- the AP100 receives the control information (radio frame) regarding the sharing of the ACK or the block ACK for the downlink signal in the coordinated communication between the base stations, and ACKs or blocks based on the received control information. Controls the transmission of ACKs to other APs.
- the AP100 receives the control information (for example, a MAP trigger frame) with another AP that does not receive the ACK or the block ACK among the APs involved in the cooperative communication between base stations and the ACK or the block.
- the control information for example, a MAP trigger frame
- the ACK or block ACK from the STA200 under the MAP is shared by a plurality of AP100s (for example, Sharing AP and Shared AP). Therefore, for example, even if the AP100 does not receive the ACK or the block ACK from the STA200, the ACK or the block ACK is acquired by sharing the ACK or the block ACK by another AP100, so that an appropriate determination regarding the necessity of retransmission is made. Is possible. Therefore, according to the present embodiment, it is possible to suppress unnecessary retransmission in the AP100 in cooperative communication and improve the efficiency of retransmission control in cooperative communication.
- AP100s for example, Sharing AP and Shared AP
- control steps (A) and (B) may be provided in the MAP trigger frame and the BA sharing phase after the process in which each STA200 transmits an ACK or a block ACK.
- the Sharing AP instructs a plurality of Shared APs (for example, all Shared APs) to share an ACK or a block ACK in the MAP trigger frame.
- the Shared AP receives the ACK or the block ACK from the STA200, and then transmits the BA shared frame including the ACK or the block ACK.
- the TXOP (channel usage period) may be set in the MAP trigger frame, which is a trigger for starting MAP data transmission, and the TXOP may include a BA sharing phase including the control step (B) described above. ..
- FIG. 34 is a diagram showing an example of a MAP control sequence according to the present embodiment.
- FIG. 34 is a diagram showing an example of the MAP control sequence in the communication environment shown in FIG. 2, as in FIG.
- an ACK or a block ACK for data transmitted from Sharing AP (AP1) and Shared AP (AP2, AP3) (for example, initial transmission data) is ACKed from STAb to Sharing AP (AP1).
- An example is shown in which the block ACK does not reach.
- the Sharing AP may set information for instructing (or requesting) sharing of an ACK or a block ACK to a plurality of Shared APs (AP2 and AP3). ..
- the information instructing the sharing of ACK or block ACK may be, for example, a 1-bit flag (BAShareReqFlag). For example, if this flag is set as enabled (for example, if ACK sharing is instructed), each Shared AP will operate assuming that the BA sharing phase of control step (B) is set. good. On the other hand, if the flag is set as invalid (for example, if ACK sharing is not instructed), each Shared AP may operate on the assumption that the BA sharing phase of control step (B) is not set. ..
- the Shared AP may specify a multiplexing method when transmitting a BA shared frame in the control step (B) in the control step (A).
- Examples of the method for multiplexing BA shared frames include time division multiplexing (TDMA: Time Division Multiple Access), frequency division multiplexing (for example, OFDMA: Orthogonal Frequency Division Multiple Access), or spatial division multiplexing (for example, MU-MIMO:). MultiUser-MultipleInputMultipleOutput) can be mentioned.
- the Shared AP may transmit the BA shared frame according to the multiplexing method specified by the MAP Trigger frame in the control step (A).
- a plurality of Shared APs instructed to share the ACK in the MAP trigger frame transmit the BA shared frame.
- the Shared AP (AP2 and AP3) notifies the Sharing AP (AP1) that does not receive the ACK or block ACK from STAb of the ACK or block ACK from STAb.
- AP1, AP2 and AP3 share an ACK or block ACK from STAb.
- the Sharing AP does not receive the ACK or block ACK of STAb from STAb, it receives it from another Shared AP (AP2) to appropriately control the retransmission to STAb.
- the Sharing AP confirms (or recognizes) that the STA b has normally received the downlink data transmitted to the STA b. Therefore, for example, as shown in FIG. 34, the Sharing AP (AP1) and the Shared AP (AP2, AP3) may simultaneously transmit data (for example, new transmission data) in the next TXOP.
- control is performed to instruct a plurality of AP100s to share the ACK or the block ACK.
- the Sharing AP and the Shared AP can share the ACK or block ACK information from each STA200 under the MAP, and useless retransmission can be suppressed.
- the control step related to the setting of the BA control AP and the BA sharing request in the BA sharing phase can be eliminated, so that the overhead related to the sharing control of the ACK can be eliminated. Can be reduced.
- the MAP trigger frame transmitted / received in the control step (A) may be configured to include, for example, information instructing a plurality of AP100s (for example, all Shared APs) to share an ACK or a block ACK.
- FIG. 35 is a diagram showing an example of the configuration of the MAP trigger frame.
- MAP trigger frame information for instructing BA sharing to a plurality of Shared APs (for example, a 1-bit BA sharing request) in the information (Common info) field shared by the plurality of AP100s.
- a flag (BAShareReqFlag) may be set.
- FIG. 35 has described the case where the BA share request flag (BA ShareReq Flag) is set in the common information field, but the present invention is not limited to this, and the BA share request flag is set in a field different from the common information field. You may.
- the BA shared frame transmitted in the control step (B) may be configured to include information regarding ACK or block ACK, as in the case of the BA shared frame in the control step (C) of the first embodiment, for example.
- the configuration example of the BA shared frame and the specification example of the frame type may be the same as, for example, the BA shared frame of the third embodiment.
- the AP100 receives the control information (for example, a wireless frame) regarding the sharing of the ACK or the block ACK for the downlink signal in the coordinated communication between the base stations, and ACKs based on the received control information. Or control the transmission of the block ACK to other APs.
- the control information for example, MAP trigger frame
- the AP100 transmits the ACK or the block ACK to the AP100 involved in the cooperative communication between base stations. decide.
- ACK or block ACK sharing control ACK or block ACK from STA200 under MAP is shared by a plurality of AP100s (for example, Sharing AP and Shared AP). Therefore, for example, even if the AP100 does not receive the ACK or the block ACK from the STA200, the ACK or the block ACK is acquired by sharing the ACK or the block ACK by another AP100, so that an appropriate determination regarding the necessity of retransmission is made. Is possible. Therefore, according to the present embodiment, it is possible to suppress unnecessary retransmission in the AP100 in cooperative communication and improve the efficiency of retransmission control in cooperative communication.
- AP100s for example, Sharing AP and Shared AP
- the information determined by the AP100 regarding the setting of sharing and the presence / absence of transmission may be, for example, at least one of the following.
- the AP100 may acquire information on the line type between Shared APs, for example, in the Multi-AP Channel sounding phase performed before the MAP data transmission, or may be acquired in another period.
- FIG. 36 is a diagram showing a configuration example of a line between Shared APs.
- the Sharing AP (AP1) and the Shared AP (AP2) are connected by a wired line
- the Sharing AP (AP1) and the Shared AP (AP3) and the Shared AP (AP2) are connected to each other.
- Shared AP (AP3) are connected by wireless line.
- the relay line between Shared APs (eg, between AP1 and AP2 in FIG. 36) is an ideal communication environment (eg, if it is a low latency wired line such as Ethernet® or optical fiber).
- AP100 does not transmit at least one of BA request frame, BA share request frame, combination of AP100 and STA200, and BA share frame wirelessly, and is a wired frame such as an Ethernet frame of IEEE802.3. You may send it at.
- the relay line between Shared APs (for example, between AP1 and AP3 in FIG. 36 or between AP2 and AP3) is not an ideal communication environment (for example, wireless).
- the AP100 is a MAP trigger frame containing a BA request frame, a BA share request frame, information on the combination of the AP100 and the STA200, and a BA share frame. At least one of them is transmitted wirelessly.
- the AP100 MAPs at least one of the BA sharing request frame and the combination of the AP100 and the STA200 in the wireless line path. It may be transmitted by a trigger frame, and a BA request frame or a BA shared frame may be transmitted by a wired frame such as an IEEE802.3 Ethernet frame in a wired line path.
- the frame transmitted on each of the wired line and the wireless line is not limited to the above-mentioned example, and may be another frame.
- FIG. 37 is a diagram showing an example of a MAP control sequence according to the present embodiment.
- the Sharing AP (AP1) and the Shared AP (AP2) are connected by a line in which both wired and wireless are mixed, and between the Sharing AP (AP1) and the Shared AP (AP3), and , Shared AP (AP2) and Shared AP (AP3) are connected by wireless line.
- FIG. 37 regarding the ACK or block ACK for the data transmitted from the Sharing AP (AP1) and the Shared AP (AP2, AP3) (for example, the initial transmission data), the ACK from STAb to the Sharing AP (AP1) or An example is shown in which the block ACK does not reach.
- the control sequence shown in FIG. 37 is, as an example, the same as the control sequence in the fourth embodiment.
- Sharing AP (AP1) and Shared AP (AP2) that can be connected by a wired line
- at least one of information regarding sharing of ACK or block ACK (for example, BA shared frame).
- BA shared frame Is transmitted in a wired frame and does not have to be transmitted wirelessly.
- the BA shared frame from the Sharing AP (AP1) to the Shared AP (AP2) and the BA shared frame from the Shared AP (AP2) to the Sharing AP (AP1) do not have to be transmitted.
- the AP100 can share information about the ACK or the block ACK of each STA200 in a short time by using the wired frame and the wireless frame in combination, and can suppress unnecessary retransmission.
- FIG. 37 shows, as an example, the control sequence in the fourth embodiment, but the present invention is not limited to this, and in any one of the first to third embodiments, the operation according to the line type in the present embodiment is applied. You may.
- sharing control is performed according to a line type such as wireless and wired
- a line type such as wireless and wired
- the present invention is not limited to this, and for example, sharing is performed according to communication performance (or communication method). Control may be performed.
- the AP100 may determine, for example, whether to perform the controls relating to the BA sharing described above, based on, for example, the MAP coordination schemes. For example, the AP100 does not need to execute the above-mentioned control regarding BA sharing when the MAP coordination scheme is JT, and the above-mentioned control regarding BA sharing when the MAP coordination scheme is different from JT. good. Further, for example, when the AP100 receives a BA sharing request frame from another AP100 and the MAP coordination scheme is JT, the AP100 may respond to the BA sharing request (for example, send a BA sharing frame).
- the BA sharing request may be instructed to the Shared AP in the MAP trigger frame, and the MAP coordination scheme is different from JT. In this case, the BA sharing request does not have to be directed to the Shared AP in the MAP trigger frame.
- the method of sharing the ACK or the block ACK between the AP100s has been described, but the signal or information shared between the AP100s is not limited to the ACK or the block ACK, and other signals or information. But it may be.
- the sharing method in the above-described embodiment may be applied to information that is expected to be shared between APs, such as channel estimates or information regarding data buffer management.
- the configurations of the BA request frame, the BA shared request frame, the BA shared frame, and the Trigger frame described in the above embodiment are examples, and the configuration is not limited to these, and other configurations may be used. For example, in these frame configurations, some fields may not be set and other fields may be further set.
- the AP instructing cooperative communication and the AP instructing cooperative communication are described by the terms “Sharing AP” and “Shared AP”, respectively, but the term is not limited to this, and other terms may be used. good.
- the description is based on the 11be format as an example, but the format to which one embodiment of the present disclosure is applied is not limited to the 11be format.
- One embodiment of the present disclosure may be applied to, for example, IEEE 802.11bd (NGV (Next Generation V2X)), which is a next-generation standard of IEEE 802.11p, which is an in-vehicle standard.
- NVG Next Generation V2X
- Each functional block used in the description of the above embodiment is partially or wholly realized as an LSI which is an integrated circuit, and each process described in the above embodiment is partially or wholly. It may be controlled by one LSI or a combination of LSIs.
- the LSI may be composed of individual chips, or may be composed of one chip so as to include a part or all of functional blocks.
- the LSI may include data input and output.
- LSIs may be referred to as ICs, system LSIs, super LSIs, and ultra LSIs depending on the degree of integration.
- the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Further, an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and settings of the circuit cells inside the LSI may be used.
- FPGA Field Programmable Gate Array
- the present disclosure may be realized as digital processing or analog processing.
- the communication device may include a wireless transceiver and a processing / control circuit.
- the wireless transceiver may include a receiver and a transmitter, or them as a function.
- the radio transceiver (transmitter, receiver) may include an RF (Radio Frequency) module and one or more antennas.
- the RF module may include an amplifier, an RF modulator / demodulator, or the like.
- Non-limiting examples of communication devices include telephones (mobile phones, smartphones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital still / video cameras, etc.).
- Digital players digital audio / video players, etc.
- wearable devices wearable cameras, smart watches, tracking devices, etc.
- game consoles digital book readers
- telehealth telemedicines remote health Care / medicine prescription
- vehicles with communication functions or mobile transportation automobiles, planes, ships, etc.
- combinations of the above-mentioned various devices can be mentioned.
- Communication devices are not limited to those that are portable or mobile, but are all types of devices, devices, systems that are non-portable or fixed, such as smart home devices (home appliances, lighting equipment, smart meters or Includes measuring instruments, control panels, etc.), vending machines, and any other "Things” that can exist on the IoT (Internet of Things) network.
- smart home devices home appliances, lighting equipment, smart meters or Includes measuring instruments, control panels, etc.
- vending machines and any other “Things” that can exist on the IoT (Internet of Things) network.
- Communication includes data communication by a combination of these, in addition to data communication by a cellular system, a wireless LAN system, a communication satellite system, etc.
- the communication device also includes devices such as controllers and sensors that are connected or connected to communication devices that perform the communication functions described in the present disclosure.
- devices such as controllers and sensors that are connected or connected to communication devices that perform the communication functions described in the present disclosure.
- controllers and sensors that generate control and data signals used by communication devices that perform the communication functions of the communication device.
- Communication devices also include infrastructure equipment that communicates with or controls these non-limiting devices, such as base stations, access points, and any other device, device, or system. ..
- the base station includes a receiving circuit for receiving control information regarding sharing of a response signal for a downlink signal in coordinated communication between base stations, and another base station of the response signal based on the control information. It is provided with a control circuit for controlling transmission to.
- control circuit comprises the other base station involved in the inter-base station cooperative communication when the control information received from the other base station indicates a request for the response signal.
- a base station different from the base station is instructed to transmit the response signal to the other base station.
- the control circuit when the control circuit indicates that the received control information requires sharing of the response signal, the control circuit transmits the response signal to the other base station indicated in the control information. To decide.
- control circuit may indicate that the control information received from the other base station requires sharing of the response signal of the terminal associated with the base station. Determines the transmission of the response signal to the base station of.
- the control circuit transmits the response signal to the other base station that does not receive the response signal among the base stations involved in the coordinated communication between the base stations.
- the transmission of the response signal from the source to the other base station is determined.
- control information is included in a signal that triggers the start of coordinated communication between base stations.
- the control circuit determines transmission of the response signal to the base station involved in the cooperative communication between the base stations.
- control information is included in a signal that triggers the start of coordinated communication between base stations.
- control circuit determines whether or not to share the response signal with the other base station based on the type of line for the other base station.
- the communication device includes a transmission unit that transmits a response signal to a downlink signal in coordinated communication to a first base station that performs coordinated communication, and information on the response signal is the coordinated. It is shared with a second base station that communicates.
- control circuit determines sharing of the response signal when the line type is wireless, and determines non-sharing of the response signal when the line type is wired.
- the base station receives control information regarding sharing of a response signal to a downlink signal in coordinated communication between base stations, and based on the control information, another base of the response signal. Control transmission to the station.
- the communication device transmits a response signal to the downlink signal in the coordinated communication to the first base station performing the coordinated communication, and the information regarding the response signal is the coordinated communication. It is shared with the second base station to do.
- One embodiment of the present disclosure is useful for wireless communication systems.
- Control unit 102 Control signal generation unit for STA 103
- Control signal generation unit for AP 104 Control signal generation unit for AP 104
- Transmission signal generation unit 105 Transmission signal generation unit 105
- Wireless transmission / reception unit 106 Receive signal demodulation / decoding unit 200
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Abstract
Description
11beでは、例えば、複数のアクセスポイント(AP:Access Point。又は、「基地局」とも呼ばれる)が協調して各端末(STA:Station。又は、「non-AP STA」とも呼ばれる)との間においてデータを送受信するMulti-AP(以下、「MAP」と呼ぶ) coordination(以下「協調通信」又は「基地局間協調通信」とも呼ぶ)の適用が検討された(例えば、非特許文献1~3を参照)。
図2は、下りリンクと上りリンクとでカバレッジ(通信可能な範囲)が異なる通信環境の例を示す図である。なお、図2に示すAP1、AP2、AP3、STA a及びSTA bの接続関係は、図1に示すAP及びSTAの接続関係と同様でよい。
本実施の形態に係る無線通信システムは、複数のAP100、及び、STA200を含んでよい。AP100は、例えば、Sharing AP及びShared APの双方の機能を備えてもよく、何れか一方の機能を備えてもよい。
[AP100の構成例]
図6は、AP100の構成例を示すブロック図である。図6に示すAP100は、例えば、制御部101と、STA向け制御信号生成部102と、AP向け制御信号生成部103と、送信信号生成部104と、無線送受信部105と、受信信号復調・復号部106と、を含んでよい。
図7は、本実施の形態に係るSTA200の構成例を示すブロック図である。図7に示すSTA200は、例えば、無線送受信部201と、受信信号復調・復号部202と、送信信号生成部203と、を含んでよい。
次に、本実施の形態に係るAP100及びSTA200の動作例について説明する。
制御ステップ(A)において送受信されるBA要求フレームは、例えば、ACK又はブロックACKを受信しないShared AP(図8では、Sharing APであるAP1)のアドレスフィールドを含む構成でよい。
・Frame ControlフィールドのType value及びSubtype value
・TriggerフレームのType
・BlockAckReqフレームのframe variant
制御ステップ(B)において送受信されるBA共有要求フレームは、例えば、ACK又はブロックACKを要求するSharing AP又はShared AP(図8の例では、AP1)のアドレスフィールドを含む構成でよい。
・Frame ControlフィールドのType value及びSubtype value
・TriggerフレームのType
・BlockAckReqフレームのframe variant
制御ステップ(C)において送受信されるBA共有フレームは、例えば、ACK又はブロックACKに関する情報を含む構成でよい。
・Frame ControlフィールドのType value及びSubtype value
・BlockAckフレームのframe variant
本実施の形態に係るAP及びSTAの構成は、実施の形態1と同様でよい。
制御ステップ(A)において送受信されるBA共有要求フレームは、例えば、ACK又はブロックACKの共有の要求先であるSharing AP又はShared AP(図20の例では、AP2)のアドレスフィールドを含む構成でよい。
・Frame ControlフィールドのType value及びSubtype value
・TriggerフレームのType
・BlockAckReqフレームのframe variant
制御ステップ(B)において送受信されるBA共有フレームは、例えば、実施の形態1の制御ステップ(C)のBA共有フレームと同様、ACK又はブロックACKに関する情報を含む構成でよい。
・Frame ControlフィールドのType value及びSubtype value
・BlockAckフレームのframe variant
本実施の形態に係るAP及びSTAの構成は、実施の形態1と同様でよい。
制御ステップ(A)において送受信されるMAP triggerフレームは、例えば、AP100毎の情報(例えば、「Per AP Info」)フィールド内に、ACK又はブロックACKが共有されるSTA200に関する情報を含む構成でよい。
制御ステップ(B)において送受信されるBA共有フレームは、例えば、実施の形態1の制御ステップ(C)のBA共有フレームと同様、ACK又はブロックACKに関する情報を含む構成でよい。
・Frame ControlフィールドのType value及びSubtype value
・BlockAckフレームのframe variant
本実施の形態に係るAP及びSTAの構成は、実施の形態1と同様でよい。
制御ステップ(A)において送受信されるMAP triggerフレームは、例えば、複数のAP100(例えば、全てのShared AP)に対してACK又はブロックACKの共有を指示する情報を含む構成でよい。
制御ステップ(B)において送信されるBA共有フレームは、例えば、実施の形態1の制御ステップ(C)のBA共有フレームと同様、ACK又はブロックACKに関する情報を含む構成でよい。また、BA共有フレームの構成例及びフレームタイプの指定例は、例えば、実施の形態3のBA共有フレームと同様でよい。
本実施の形態に係るAP及びSTAの構成は、実施の形態1と同様でよい。
・実施の形態1におけるBA要求フレーム
・実施の形態1又は2におけるBA共有要求フレーム
・実施の形態3におけるAP100とSTA200との組み合わせに関する情報
・実施の形態4における複数のShared APにおけるBA共有に関する情報
上述した各実施の形態において、AP100は、例えば、MAP coordination schemesに基づいて、上述したBA共有に関する制御を実行するか否かを決定してもよい。例えば、AP100は、MAP coordination schemeがJTの場合には、上述したBA共有に関する制御を実行し、MAP coordination schemeがJTと異なる方式の場合には、上述したBA共有に関する制御を実行しなくてもよい。また、例えば、AP100は、他のAP100からBA共有要求フレームを受信した場合、MAP coordination schemeがJTの場合には、BA共有要求に対して応答(例えば、BA共有フレームを送信)してもよく、MAP coordination schemeがJTと異なる方式の場合には、BA共有要求に対して応答しなくてもよい。また、例えば、上述した実施の形態3~5において、MAP coordination schemeがJTの場合には、MAP triggerフレームにてBA共有要求がShared APへ指示されてもよく、MAP coordination schemeがJTと異なる方式の場合には、MAP triggerフレームにてBA共有要求がShared APへ指示されなくてもよい。
101 制御部
102 STA向け制御信号生成部
103 AP向け制御信号生成部
104,203 送信信号生成部
105,201 無線送受信部
106,202 受信信号復調・復号部
200 STA
Claims (13)
- 基地局間協調通信における下り信号に対する応答信号の共有に関する制御情報を受信する受信回路と、
前記制御情報に基づいて、前記応答信号の他の基地局への送信を制御する制御回路と、
を具備する基地局。 - 前記制御回路は、前記他の基地局から受信した前記制御情報が前記応答信号の要求を示す場合、前記基地局間協調通信に関わる基地局のうちの前記他の基地局とは異なる基地局に対して、前記他の基地局への前記応答信号の送信を指示する、
請求項1に記載の基地局。 - 前記制御回路は、受信した前記制御情報が前記応答信号の共有を要求することを示す場合、前記制御情報において示される前記他の基地局への前記応答信号の送信を決定する、
請求項1に記載の基地局。 - 前記制御回路は、前記他の基地局から受信した前記制御情報が、前記基地局にアソシエートされた端末の前記応答信号の共有を要求することを示す場合、前記他の基地局に対する前記応答信号の送信を決定する、
請求項1に記載の基地局。 - 前記制御回路は、受信した前記制御情報が、前記基地局間協調通信に関わる基地局のうち、前記応答信号を受信しない前記他の基地局と前記応答信号の送信元との組み合わせを示す場合、前記他の基地局に対する、前記送信元からの前記応答信号の送信を決定する、
請求項1に記載の基地局。 - 前記制御情報は、前記基地局間協調通信の開始をトリガーする信号に含まれる、
請求項5に記載の基地局。 - 前記制御回路は、受信した前記制御情報が前記応答信号の共有を指示する場合、前記基地局間協調通信に関わる基地局に対する前記応答信号の送信を決定する、
請求項1に記載の基地局。 - 前記制御情報は、前記基地局間協調通信の開始をトリガーする信号に含まれる、
請求項7に記載の基地局。 - 前記制御回路は、前記他の基地局に対する回線の種別に基づいて、前記他の基地局と前記応答信号を共有するか否かを決定する、
請求項1に記載の基地局。 - 前記制御回路は、前記回線の種別が無線の場合に前記応答信号の共有を決定し、前記回線の種別が有線の場合に前記応答信号の非共有を決定する、
請求項9に記載の基地局。 - 協調通信における下り信号に対する応答信号を、前記協調通信を行う第1の基地局に送信する、送信部を具備し、
前記応答信号に関する情報は前記協調通信を行う第2の基地局に共有される、
通信装置。 - 基地局は、
基地局間協調通信における下り信号に対する応答信号の共有に関する制御情報を受信し、
前記制御情報に基づいて、前記応答信号の他の基地局への送信を制御する、
通信方法。 - 通信装置は、
協調通信における下り信号に対する応答信号を、前記協調通信を行う第1の基地局に送信し、
前記応答信号に関する情報は前記協調通信を行う第2の基地局に共有される、
通信方法。
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