Access point and control method for coordinated communication

Abstract

An access point according to the present invention comprises: a transmission / reception unit that transmits and receives information pertaining to reconfiguration of coordinated communication; and a control unit that reconstructs the coordinated communication on the basis of the received information relating to the reconfiguration of the coordinated communication.

Description

Technical Field

[0001] The present disclosure relates to an access point and a control method for coordinated communication. Background Art

[0002] As a successor standard to IEEE (the Institute of Electrical and Electronics Engineers) 802.11 standard 802.11ax (hereinafter referred to as "11ax"), the technical specification of 802.11be (hereinafter referred to as "11be") is being planned and developed. 11ax is also known as "High Efficiency (HE)", and 11be is also known as "Extreme High Throughput (EHT)". In addition, the successor standard of 11be is sometimes called "Ultra High Reliability (UHR)", and the required specifications are also being discussed.

[0003] Prior Art Documents

[0004] Non-Patent Documents

[0005] Non-Patent Document 1: IEEE 802.11-19 / 1961r1, Multi-AP Group Establishment

[0006] Non-Patent Document 2: IEEE 802.11-19 / 0103r1, AP Coordination in EHT

[0007] Non-Patent Document 3: IEEE Std 802.11-2020, December 2020 Summary of the Invention

[0008] In 11be and UHR, the application of multi-Ap coordination (hereinafter referred to as "coordinated communication") is studied, in which access points (also called "base stations", hereinafter referred to as "AP (Access Point)") coordinate to transmit and receive data with each terminal (also called "non-AP STA (non-AP STA) (station)", hereinafter referred to as "STA").

[0009] However, the reconstruction process of multi-AP control objects has not been studied, nor has the control in cases where the coordination communication objects change or become unnecessary for coordination communication, such as when an AP or STA stops, data transmission stops, or interference from APs and STAs performing coordinated communication decreases. In addition, the control of APs performing coordinated communication in each coordination method has not been studied.

[0010] Non-limiting embodiments of the present disclosure contribute to providing a reconstruction process for multi-AP control objects.

[0011] An access point according to an embodiment of the present disclosure includes: a transceiver unit that transmits and receives information related to the reconstruction of coordinated communication; and a control unit that reconstructs coordinated communication based on the received information related to the reconstruction of coordinated communication.

[0012] Furthermore, these broad or specific embodiments may be implemented by a system, apparatus, method, integrated circuit, computer program, or recording medium, or may be implemented by any combination of a system, apparatus, method, integrated circuit, computer program, and recording medium.

[0013] According to the present invention, a wireless communication device and a communication method for controlling coordinated communication can be provided.

[0014] More advantages and effects of an embodiment of the present disclosure will be clarified by the specification and the drawings. These advantages and / or effects are provided by several embodiments and the features described in the specification and the drawings, but it is not necessary to provide all of them in order to obtain one or more of the same features. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram showing the format of an element.

[0016] Figure 2 It is a diagram showing a table of element IDs (Identifiers).

[0017] Figure 3 It is a diagram showing a structural example of an STA.

[0018] Figure 4 It is a diagram showing a structural example of an AP.

[0019] Figure 5 It is a diagram showing a configuration example of an AP and an STA.

[0020] Figure 6 It is a diagram showing the overall steps.

[0021] Figure 7 It is a diagram showing another AP configuration example.

[0022] Figure 8 This is a diagram showing an example of the list notification format of the Coordination Group.

[0023] Figure 9 This is a diagram showing an example of the update notification format.

[0024] Figure 10 This is a diagram showing the action timing.

[0025] Figure 11 This is a diagram showing another example of AP configuration.

[0026] Figure 12 This is a diagram showing the action timing.

[0027] Figure 13 This is a diagram showing an example of the format of the interference measurement request.

[0028] Figure 14 This is a diagram showing an example of the format of the interference measurement report.

[0029] Figure 15 This is a diagram showing another example of AP configuration.

[0030] Figure 16 This is a diagram showing an example of the list notification format of the coordinated communication group. Detailed implementation manners

[0031] <Regarding multi-AP coordination>

[0032] As a structure for coordinated communication, a method is proposed in which an AP that regulates coordinated communication (also referred to as: Coordination Group, Coordination set, multi-AP group, AP candidate set) performs coordinated communication by the APs included in the APs that are the objects of coordinated communication (refer to Non-Patent Document 1).

[0033] On the other hand, as a method of coordinated communication, C-OFDMA (Coordinated Orthogonal Frequency Division Multiple Access), C-TDMA (Coordinated Time Division Multiple Access), C-SR (Coordinated Spatial Reuse), JT (Joint Transmissions), etc. are proposed (refer to Non-Patent Document 2).

[0034] In addition, in IEEE802.11, elements can be cited as the information for transmission and reception. Figure 1 The format of the element is shown in Figure 2 The table of element IDs is shown in (see Non-Patent Document 3).

[0035] <Embodiment 1>

[0036] In one aspect of the present invention, in a group composed of multiple APs capable of coordinated communication (hereinafter referred to as "Coordination Group"), the APs included perform multi-AP coordinated communication.

[0037] [Structure of STA]

[0038] Figure 3 Fig. shows a structural example of STA300. STA300 includes a transmission frame generation unit 301, a control circuit 302, a wireless transceiver circuit 303, a frame reception unit 304, and a reception quality measurement unit 305. The control unit 306 may be constituted by at least one of the transmission frame generation unit 301, the control circuit 302, the frame reception unit 304, and the reception quality measurement unit 305.

[0039] The transmission frame generation unit 301 generates a transmission frame based on the input data and the control information generated by the control circuit 302, and outputs it to the wireless transceiver circuit 303.

[0040] The control circuit 302 generates control information based on the input data, the control information obtained by the frame reception unit 304, the reception quality obtained by the reception quality measurement unit 305, and the internal state, and outputs it to the transmission frame generation unit 301.

[0041] The wireless transceiver circuit 303 encodes and modulates the transmission frame generated by the transmission frame generation unit 301 to generate a baseband transmission signal (also referred to as PPDU: Physical layer Protocol Data Unit). In addition, the PPDU is converted into a high-frequency signal (RF: Radio Frequency signal) and output to the antenna.

[0042] The wireless transceiver circuit 303 receives a wireless signal using the antenna and outputs it to the frame reception unit 304 and the reception quality measurement unit 305.

[0043] The frame reception unit 304 outputs the output data received by the decoded frame, and outputs the control information to the reception quality measurement unit 305 and the control circuit 302.

[0044] The reception quality measurement unit 305 measures the reception quality based on the reception signal obtained by the wireless transceiver circuit 303, the control information obtained by the frame reception unit 304, and the internal state.

[0045] [Structure of AP]

[0046] Figure 4 An example of the structure of the AP 400 is shown. The AP 400 includes a transmission frame generation unit 401, a control circuit 402, a wireless transceiver circuit 403, a reception frame decoding unit 404, a reception quality measurement unit 405, and a coordination control unit 406. The structure of the AP 400 can also be a structure in which the coordination control unit 406 is added to the structure of the STA 300 shown in Figure 3 The control unit 407 can be composed of at least one of the transmission frame generation unit 401, the control circuit 402, the reception frame decoding unit 404, the reception quality measurement unit 405, and the coordination control unit 406.

[0047] The transmission frame generation unit 401, the control circuit 402, the wireless transceiver circuit 403, the reception frame decoding unit 404, and the reception quality measurement unit 405 can have the same functions as the transmission frame generation unit 301, the control circuit 302, the wireless transceiver circuit 303, the frame reception unit 304, and the reception quality measurement unit 305.

[0048] The coordination control unit 406 generates coordination control information for controlling coordination communication based on the input data, the control information obtained by the reception frame decoding unit 404, the reception quality obtained by the reception quality measurement unit 405, and the internal state, and outputs it to the control circuit 402.

[0049] <Example 1>

[0050] Hereinafter, as an example, Figure 5 An example of the configurations of the AP and the STA is shown. An example of the operation when the STA 3 stops in a state where coordinated communication is performed among the 3 APs and 3 STAs configured as shown in Figure 5 is described. In addition, in Figure 5In the configuration example of the AP and STA shown, AP1 is the AP that controls coordinated communication (also referred to as "coordinator AP, primary AP, controller AP, or master AP". Hereinafter referred to as "coordinator AP"), and AP2 and AP3 are the APs that are controlled for coordinated communication (also referred to as "coordinated AP, secondary AP, agent AP, or slave AP". Hereinafter referred to as "coordinated AP"). The inter-AP communication between AP1 and AP2 and between AP2 and AP3 is wireless communication. STA1 is associated with AP1, STA2 is associated with AP2, and STA3 is associated with AP3.

[0051] Figure 6 Indicates the overall steps. As Figure 6 shown, after the multi-AP setup S601, each AP performs multi-AP measurement S602 and multi-AP transmission S603.

[0052] Figure 8 Indicates the coordinated group list notification format. In the multi-AP setup S601, AP1, which is the coordinator AP, forms a coordinated group based on information of surrounding APs such as information contained in the received beacon, for example. It is possible that each AP creates a list of APs included in the coordinated group (hereinafter referred to as "coordinated group list") and notifies the surrounding APs of the coordinated group list. The coordinated group list notification format shown in Figure 8 can be used to notify the coordinated group list.

[0053] In Figure 5 the configuration example shown, AP1 cannot receive the beacon sent by AP3, but AP2 can forward the information contained in the beacon of AP3 to AP1, and the coordinated group list is set to (AP1, AP2, AP3).

[0054] In the multi-AP measurement S602, the AP and / or STA can also perform interference measurement with reference to the coordinated group list. For example, each AP can measure the interference with the APs included in the coordinated group list and the STAs associated with the APs included in the coordinated group list.

[0055] Each AP can request the measurement of interference from the AP and STA that are the measurement objects to the APs included in the coordination group list and the STAs associated with the APs included in the coordination group list, so that the interference measurement reports of each AP and each STA are sent to the AP that indicates the interference measurement. Each AP can send the coordination group list to the associated STA, so that the STA refers to the list to measure interference and reports the result of the measured interference to the AP as an interference measurement report. Figure 13 The interference measurement request format shown can be used for the request of interference measurement. Figure 14 The interference measurement report format shown can be used for the interference measurement report.

[0056] Each AP can send a trigger indicating the execution of interference measurement to the associated STA.

[0057] In this operation example, it can be that STA1 measures the interference from AP2, AP3 shown in the coordination group list, STA2 associated with AP2, and STA3 associated with AP3, and sends the interference measurement report to AP1 associated with STA1. STA1 can perform multi-AP measurement regularly, or can perform multi-AP measurement when, for example, the path loss changes. In the case of operating in a coordination mode that does not require interference measurement such as C-OFDMA, C-TDMA, etc., STA1 may not perform multi-AP measurement S602. AP1 can notify the interference measurement report to APs AP2 and AP3 shown in the coordination group list through inter-AP communication.

[0058] In multi-AP transmission S603, the AP that has obtained the TXOP (Transmission Opportunity) becomes the Sharing AP, and the Sharing AP refers to the interference measurement report obtained in the multi-AP measurement S602 and performs coordinated communication with multiple APs included in the coordination group as the transmission source or destination.

[0059] An example is described in which, in the state where each AP performs the multi-AP measurement S602 or multi-AP transmission S603 shown Figure 6 STA3 associated with AP3 has no data to send and receive, and STA3 stops the action of data sending and receiving.

[0060] Figure 9 Indicates the update notification format. AP3 can notify AP2 of the situation where there is no data to send and receive with the associated STA3 in the update notification format shown, for example, Figure 9 AP2 that has received the update notification format can forward the received update notification format to AP1. AP1 can delete AP3 from the coordination group list according to the information that AP3 has stopped data sending and receiving included in the update notification format.

[0061] AP1 can use, for example, Figure 8 the coordination group list notification format shown in the figure to notify the list after deletion to AP2.

[0062] In this way, the AP that has stopped data transmission and reception is deleted from the coordination group list to update the coordination group list, so that the number of APs and STAs that are the measurement objects of the multi-AP measurement S602 can be reduced. Therefore, the amount of information of the interference measurement results notified by the STA to the AP can be reduced, and the throughput can be improved. In addition, by reducing the measurement objects of the STA, the power consumption of the STA can be reduced. Furthermore, since AP-to-AP communication such as coordination control information for the AP deleted from the coordination group list is not required, the throughput is improved.

[0063] When the operation of STA3 resumes or a new STA associates with AP3 and AP3 starts data transmission and reception, it can be that AP3 notifies AP2 of the start of data transmission and reception in a situation such as, for example, Figure 9 the update notification format shown in the figure. AP2 forwards the update notification format to AP1. AP1 can append AP3 to the coordination group list based on the information that AP3 has started data transmission and reception in the update notification format. AP1 can use, for example, Figure 8 the coordination group list notification format shown in the figure to notify the coordination group list with AP3 appended to AP2. AP2 can forward the received coordination group list notification format to AP3.

[0064] It can be that when AP3 stops, a deletion notification is sent, for example, through the shutdown process of AP3. It can also be that when the situation where AP2 cannot receive the beacon of AP3 has continued for a preset time, AP2 sends a deletion notification to AP1. Here, as the preset time, maxlostbeacons shown in Non-Patent Document 3 can be used, or a newly set value for determining the stop of the AP can be used.

[0065] A structure that does not determine a coordinator AP can also be adopted. Each AP can be, for example, to create its own coordination group list according to the information of surrounding APs by each AP. The information of surrounding APs can be grasped based on the received beacon. It can be that the AP that has received update notifications such as addition and deletion through Figure 9 the update notification format shown in the figure updates its own coordination group list.

[0066] In addition, each AP can also broadcast its own coordination group list to surrounding APs. The coordination group list can be broadcast, for example, in a beacon. Since each AP broadcasts the coordination group list, it can be that if an AP or STA receives an unupdated coordination group list, it is determined that the AP that sent the unupdated coordination group list failed to receive an update notification. Then, the AP or STA that has received the updated coordination group list forwards the coordination group list.

[0067] In addition, although an operation example using a coordination group list is shown, instead of using a coordination group list, the coordinator AP can have information equivalent to the coordination group list to control the coordinated APs, or each AP can have information equivalent to the coordination group list respectively.

[0068] One AP can be included in multiple coordination groups. For example, in the configuration example of the AP shown as Figure 5 a different configuration example Figure 7 AP2 can also generate two coordination groups {(AP1, AP2), (AP2, AP3)} consisting of the coordination group composed of (AP1, AP2) and the coordination group composed of (AP2, AP3). The coordination groups can be distinguished, for example, by an identification number such as a coordination group ID.

[0069] [Format example]

[0070] It is possible to use Figure 1 the element format shown to notify control information related to multiple APs, etc. For example, the element ID = 255 and the element ID extension = 111 in the table of element IDs shown Figure 2 can be set as a multi-AP element. As an example, the value of the element ID extension is set to 111, but it can also be set to other values indicating that the element is a multi-AP element. For example, the multi-AP element can be included in the information of a management frame (for example, a beacon, a probe response, an association request, a re-association request, an association response, or a re-association response frame), or can also be included in other action frames newly defined in the 11be standard or subsequent standards. In addition, control information related to multiple APs can also be notified in a format other than the element format. The multi-AP element can also be called other names, for example, "multi-AP information element".

[0071] The subtype (also known as variant) of the multi-AP element can be represented by the value of the Type field. For example, in the multi-AP element, type = 0 and type = 1 can be used as the format of the multi-AP setting, type = 2 can be used as the coordination group list notification format, type = 3 can be used as the update notification format, type = 4 can be used as the interference measurement request format, and type = 5 can be used as the interference measurement report format.

[0072] Figure 8 An example representing the coordination group list notification format is given. The coordination group list notification format includes identifiers of one or more APs or BSSs (Basic Service Sets) included in the coordination group (e.g., BSSID, Mac address, BSS color, etc.). The coordination group list notification format can also include an identifier representing the coordination group, such as the coordination group ID. As an example, the coordination group list notification format can include one or more BSS IDs included in the coordination group ID.

[0073] Figure 9 An example representing the update notification format is given. The update notification format includes an update category and a BSS ID. The update category indicates the content to be notified. For example, 0 indicates deletion and 1 indicates addition. However, it can also be that 1 indicates deletion and 0 indicates addition. The BSS ID represents identifiers such as the BSSID, Mac address, and color of the AP or BSS to be updated.

[0074] The case where the coordination group list notification format and the update notification format are defined as subtypes of the multi-AP element has been described. However, the information contained in the coordination group list notification format and the update notification format can also be included in other elements (such as the multi-AP information element) or formats other than the element format (such as frames, fields, etc.) for notification.

[0075] <Example 2>

[0076] An example of the operation when APs participating in a coordination group perform inter-AP communication via a backhaul line is described. The backhaul line can be a wired, wireless, or hybrid wired and wireless line. The wired line can be, for example, Ethernet. The wireless line can be, for example, a BSS with an SSID different from the SSID used in AP-STA communication, pre-association communication, or wireless LAN communication other than BSS such as OCB (Outside the context of a BSS), or other wireless communication methods.

[0077] For example, the process of Wi-Fi Easy Mesh can be used for constructing a multi-AP structure. For example, control of coordinated communication such as updating a coordinated group list can be performed by a Multi-AP Controller included in a coordinator AP. Notifications regarding coordinated communication between each AP can be set as notifications between SMEs (station management entities) of the Multi-AP Controller and notifications of the MLME (MAC sublayer management entity).

[0078] Hereinafter, as an example, an example of an operation of updating a coordinated group list in a state where coordinated communication is performed in the configuration example shown in the same Figure 5 as in the first embodiment will be described, in the case where AP1 is a coordinator AP and STA3 stops.

[0079] Figure 10 FIG. shows the operation timing of this operation example. In Figure 10 the AP3 shown, for example, the stop of STA3 can be notified from the SME of AP3 to the MLME of AP3 by MLME-DISASSOCIATE.request (S1001). In the IEEE 802.11 standard, the SME is sometimes referred to as the upper layer.

[0080] It can be that the MLME (MAC layer) of AP3 notified of MLME-DISASSOCIATE.request notifies the SME of AP3 of MLME-DISASSOCIATE.response (S1002), and determines that since STA3 has stopped, there are no longer any STAs associated with AP3, and AP3 stops data transmission and reception, so coordinated communication for AP3 is not required.

[0081] The MLME of AP3 can notify the SME of AP3 of the stop of coordinated communication of AP3 by, for example, MLME-MULTIAP-RECONFIGURATION.indication (S1003). In addition, the notification of the stop of coordinated communication can adopt the same data structure as the Figure 9 update notification format shown.

[0082] The SME of AP3 can use inter-AP communication based on a wired connection to notify the multi-AP controller of AP1 of the stop of coordinated communication of AP3 as an update notification of AP3 (S1004). The multi-AP controller of AP1 can perform an update of removing AP3 from the coordinated group list.

[0083] The multi-AP controller of AP1 can notify the updated coordinated group list to the SMEs of AP1 and AP2 (S1005, S1007).

[0084] The SME of AP1 and AP2 can notify the MAC layers of AP1 and AP2 by notifying the MLME-MULTIAP-RECONFIGURATION.request to the MLME of AP1 and AP2 (S1006, S1008). In addition, the MLME-MULTIAP-RECONFIGURATION.request can adopt a data structure identical to the coordinated group list notification format shown in Figure 8 Upon receiving the updated coordinated group list notification format, the MLMEs of AP1 and AP2 can send measurement requests and / or measurement reports for the APs included in the list of APs such as the list of BSS IDs included in the updated coordinated group list notification format, and / or measure the reception quality of beacon frames, other frames, and / or NDPs sent from the APs included in the list. In addition, it is possible to stop sending measurement requests and / or reports for APs not included in the updated list such as AP3, and measuring the reception quality of beacon frames, other frames, and / or NDPs sent from APs not included in the list.

[0085] By updating the coordinated group list in this way, as in the first embodiment, it is possible to reduce the measurement targets of the multi-AP measurement S602, so that the throughput can be improved and the power consumption of the STA can be reduced.

[0086] In addition, when the operation of STA3 resumes or a new STA associates with AP3 and AP3 starts data transmission and reception, AP3 can notify the multi-AP controller via the MLME and SME of AP3 and the inter-AP communication between AP3 and AP1. In this case, the MLME-MULTIAP-RECONFIGURATION.indication can be used in the notification between the MLME and SME of AP3, and a data structure identical to the updated notification format shown in Figure 9 is adopted.

[0087] In addition, when AP3 stops, the multi-AP controller can also perform the same operation. For example, the multi-AP controller can confirm the responses of each AP by means of ping or the like, remove the non-responsive APs from the coordinated group list, update the coordinated group list, and notify it.

[0088] In addition, for example, a structure may be adopted in which the MAC layer of each AP manages its own list, and the multi-AP controller does not manage the coordination group list. In this case, instead of the coordination group list, the update notification may be notified using MLME-MULTIAP-RECONFIGURATION.request and / or MLME-MULTIAP-RECONFIGURATION.response. Alternatively, both the update notification and the coordination group list may be notified. Or, for example, it may be specified in the MLME-START.request notified from the upper layer at startup or the MLME-START.response notified to the upper layer whether the MAC layer of each AP manages or does not manage its own coordination group list. The notification content may be switched according to whether it is managed or not.

[0089] In addition, an operation example in which the multi-AP controller controls coordinated communication is shown here. However, in the case of an ESS (Extended Service Set) structure, instead of the multi-AP controller, the control device that controls the ESS may control the coordinated communication.

[0090] In addition, a structure in which both wired and wireless communications coexist in the inter-AP communication may be adopted. In this case, in the case where the inter-AP communication is wireless communication, the operation of Example 1 may be performed, and in the case where the inter-AP communication is wired communication, the operation of Example 2 may be performed.

[0091] <Example 3>

[0092] In Example 1 and Example 2, operation examples of reconstructing the coordination group due to the stop of the AP or STA are shown. In Example 3, an example of controlling coordinated communication in a manner that takes into account the influence of interference using a group (hereinafter referred to as "coordination set") composed of multiple APs that perform coordinated communication is shown. The coordination group is a group of access points that may perform coordinated communication, and the coordination set is a group of access points in the coordination group where the coordinated communication can actually function.

[0093] Hereinafter, as an example, in Figure 11 a configuration example in which 3 APs and 3 STAs are configured is shown. An example of the operation when STA2 moves in the direction of the arrow in the coordinated communication state in the Figure 11 configuration example will be described. In addition, in Figure 11In the configuration example shown, the inter-AP communication between AP1 and AP3 and between AP2 and AP3 is performed wirelessly. STA1 is associated with AP1, STA2 is associated with AP2, and STA3 is associated with AP3. In addition, AP2 and STA2 associated with AP2 are only affected by the interference from AP1 and STA1 associated with AP1 before moving. The coordination group list in Embodiment 3 is the same as that in Embodiment 1 (AP1, AP2, AP3).

[0094] It can be that when an AP and the STA associated with the AP are affected by the interference from the AP and / or the STA associated with the AP included in the coordination group shown in Embodiment 1 or Embodiment 2, that is, when there is an interference effect, the identifier of the AP with the interference effect is registered in the coordination set.

[0095] Figure 12 indicating Figure 11 An example of the operation timing in the configuration example shown. AP1 recognizes being affected by the interference from AP3 by receiving the frame sent by AP3 (S1201).

[0096] It can be that if AP1 recognizes the situation of AP3 transmitting according to the BSS color contained in the preambles of the received frame, it determines that it is affected by the interference from AP3 and registers AP3 in the coordination set (S1202). Similarly, it can be that AP2 registers AP3 in the coordination set, and AP3 registers AP1 and AP2 in the coordination set.

[0097] Next, each AP can update the coordination set according to whether there is interference in the associated STA. For example, AP1 can send an interference measurement request to the associated STA1 (S1203). Figure 13 An example of the interference measurement request format is shown. In the interference measurement request, an action to report when an interference signal is received can be specified.

[0098] It can be that STA1 that receives the interference measurement request sends a report of the interference measurement to AP1 when there is an interference effect (S1204). Figure 14 An example of the interference measurement report format is shown. In Figure 11 In the configuration example shown, STA1 is affected by the interference from STA2. Based on the BSS color contained in the preamble of the received frame, STA1 sends the situation of being affected by the interference from STA2 associated with AP2 as an interference measurement report to AP1.

[0099] AP1 can append AP2 to the coordination set according to the received interference measurement report (S1205).

[0100] AP2 and AP3 perform the same processing as AP1. AP2 may send an interference measurement request to the associated STA2 (S1206). STA2 may send the situation of being affected by the interference from STA1 and / or AP1 to AP2 (S1207). AP2 may add AP1 to the coordination set (S1208).

[0101] Each AP may also perform the multi-AP measurement S602 and multi-AP transmission S603 shown with reference to the coordination set instead of the coordination group shown in Embodiment 1 and Embodiment 2. Figure 6 shown

[0102] Each AP may send to the associated STA Figure 13 the interference measurement request shown to detect a change in the reception environment. For example, AP2 may send an interference measurement request to STA2 (S1206, S1209). In the interference measurement request, an action to report when the interference signal from STA1 and / or AP1 can no longer be received may be specified.

[0103] Regarding the state where the multi-AP measurement S602 and multi-AP transmission S603 shown are being performed Figure 6 An example of the actions of each AP when STA2 moves in the direction away from AP1 and thus STA2 becomes not affected by the interference from STA1 and AP1 will be described.

[0104] Since STA2 has moved and is no longer affected by the interference from STA1 and AP1, as a response to the received interference measurement request (S1209), STA2 may send an interference measurement report without interference effect to AP2 (S1210). AP2 may delete AP1 from the coordination set based on the received interference measurement report (S1211).

[0105] In this way, even when using the coordination set instead of the coordination group, it is possible to reduce the number of APs and STAs to be measured in the multi-AP measurement S602, so the amount of information of the interference measurement results notified by the STA to the AP can be reduced. As a result, the throughput is improved. By reducing the measurement objects of the STA, the power consumption of the STA can be reduced. In addition, by setting the object of AP-to-AP communication to the APs included in the coordination set, unnecessary AP-to-AP communication can be prevented, so the throughput is improved.

[0106] By using the coordination set as the group that actually performs coordination communication in the coordination group, it is possible to manage a semi-fixed group that may perform coordination communication with the coordination group, and manage the group that is currently performing coordination communication corresponding to the interference situation with the coordination set.

[0107] AP2 can notify AP1 of the confirmability of whether AP1 can be deleted from the coordination set (S1212). For example, the update notification format shown in Figure 9 can be used for the confirmability. Additionally, instead of the confirmability of deleting AP1, AP2 can notify AP1 of the coordination set from which AP1 has been deleted.

[0108] AP1 that has received the confirmability of deleting AP1 can send a request for interference measurement to STA1 regarding AP2 and the STAs associated with AP2 (S1213). In the interference measurement request, an action of reporting the presence or absence of an interference signal can be specified.

[0109] STA1 that has received the interference measurement request can send an interference measurement report indicating the presence or absence of interference effects to AP1 (S1214). Since STA2 has moved, STA1 sends an interference measurement report without the interference effect of STA2 to AP1.

[0110] AP1 can send a response to the update notification to AP2 based on the interference measurement report of STA1 (S1215). AP2 can perform the process of deleting AP1 from the coordination set (S1211) after receiving the response to the update notification (S1215).

[0111] It can be that when in S1214, through the interference measurement report, AP1 is notified by STA1 of the presence of interference effects, AP1 sends a response to the update notification that negates the deletion of AP1 from AP2's coordination set. It can be that when in S1214, through the interference measurement report, AP1 is notified by STA1 of the absence of interference effects, AP1 sends a response to the update notification that affirms the deletion of AP1 from AP2's coordination set. The Figure 14 shown interference measurement report format can be used for the response to the update notification.

[0112] AP1 can delete AP2 from AP1's coordination set based on AP2's update notification or STA1's interference measurement result (S1216). Thereby, the coordination sets of both AP1 and AP2 can be updated.

[0113] Here, an example of the action of AP1 sending an interference measurement request to STA1 is shown, but it can also be that, through broadcast information, it is sent to all associated STAs. By doing so, AP1 can confirm the presence or absence of interference effects caused by AP2 and the STAs associated with AP2 to all STAs associated with AP1. Additionally, here, an example of the action of specifying the action of reporting the presence or absence of an interference signal in the interference measurement request is shown, but it can also be that the action of reporting when an interference signal is received is specified. By doing so, the sending of interference measurement reports from STAs that have never received an interference signal can be prevented.

[0114] Although an example of an operation using a coordination group and a coordination set is shown here, a configuration may also be adopted in which only a coordination group is used and an AP with less interference influence is deleted from the coordination group.

[0115] Although an example of an operation for determining interference influence based on whether an interference signal is received is shown here, it may also be that interference influence is determined when the received power of the interference signal is equal to or greater than a threshold value. In this case, the threshold value of the received power may be added to Figure 13 the format of the interference measurement request shown.

[0116] It may be that when returning to a position where interference from AP1 is received, such as the original position for example, STA2 notifies AP2 of the reception of the interference signal in the format of the interference measurement report shown, for example. Figure 14 In this case, AP2 may send an interference measurement request to STA2 in advance. In the interference measurement request, an operation to report when an interference signal from STA1 and / or AP1 is received may be specified. It may be that, in the same manner as the operation when deleting STA2, AP2 adds AP1 to the coordination set of AP2 and notifies AP1 of the approval confirmation for adding AP1.

[0117] In the case of a configuration in which direct inter-AP communication between AP1 and AP2 is not possible as shown in Figure 11 , for example, notification may be made via AP3, or notification may be made using a higher layer. Notification using a higher layer may also include notification based on wired communication.

[0118] The coordinator AP may manage the coordination sets of the APs included in the coordination group. For example, in Figure 11 , when AP3 is the coordinator AP, AP2 may send an interference measurement report of the interference caused by STA2 to AP3. AP3 may send an interference measurement request to AP1 based on the interference measurement report received from AP2. AP1 may perform an interference measurement based on the interference measurement request received from AP3 and send an interference measurement report to AP3. AP3 may update the coordination set based on the interference measurement reports received from AP2 and AP1, and send a list of the APs included in the updated coordination set (hereinafter referred to as "coordination set list") to AP1 and AP2.

[0119] It is possible to Figure 8The coordination group list notification format shown below is used for sending the coordination set list. It is possible to append information for identification (e.g., the ListType field) to the coordination group list notification format in order to identify whether the object of the notification is a coordination group list or a coordination set list. Set "ListType = 0" to indicate that the object of the notification is a coordination group list, and "ListType = 1" to indicate that the object of the notification is a coordination set list. Alternatively, the coordination group ID included in the coordination group list notification format can be set to a number in a way that can distinguish between the coordination group list and the coordination set list. For example, set it such that when the coordination group ID is 128 or higher, the object of the notification is a coordination group, and when the coordination set ID is 127 or lower, the object of the notification is a coordination set. By using different numbers for the coordination group list and the coordination set list, information for identification (e.g., the ListType field) can be omitted.

[0120] Although an example of the action of creating a coordination set with reference to a coordination group is shown, it is also possible to create a coordination set without referring to a coordination group.

[0121] It is possible to append the interference impact information of each AP or each BSS to the coordination set list and / or the coordination group list. For example, it is possible to append the interference impact information of each BSS to the coordination group member list notification format shown below. The interference impact information can be, for example, "0: There is interference from the AP and the STA; 1: There is only interference from the AP; 2: There is only interference from the STA; 3: There is no interference". By referring to the interference impact information to request the interference measurement of the STA, unnecessary measurement requests can be prevented. For example, when it is Figure 8 as shown below, in the coordination group member list of AP2 in the case where the interference impact information is appended, before STA2 moves, it is "AP1(2), AP3(1)" (the value shown in "()" is the value of the interference impact information), and after STA2 moves, it is "AP1(3), AP3(1)". It is possible for AP2 to send a Figure 11 interference measurement request as shown below to STA2 that is affected by interference from AP1 whose interference impact information is 2 (i.e., there is only interference from the STA). Figure 12 shown below.

[0122] Alternatively, instead of appending the interference impact information to the coordination set list and / or the coordination group list, a list of APs that summarizes, for example, "there is only interference from the STA" can be created.

[0123] [Format example]

[0124] Figure 13 represents the interference measurement request format. The interference measurement request can be set to the Figure 13 interference measurement request format shown below. Figure 13 An example where the type is set to 4 in the multi-AP element is shown.

[0125] Figure 13 The format of the interference measurement request shown includes Measurement Type, Duration, BSS ID, and STA ID. The Measurement Type indicates the interference measurement method. The Duration indicates the measurement time corresponding to the interference measurement method indicated by the Measurement Type. The BSS ID indicates the BSS ID of the interference measurement target AP and STA such as the BSS color, etc. The STA ID indicates the ID of the STA that performs measurements such as AID, etc.

[0126] The Measurement Type indicates the type of interference measurement method, for example, represented by 0 - 3.

[0127] For example, Measurement Type = 0 indicates the following method: after receiving the format of the interference measurement request, or after receiving the interference signal from the measurement target specified by the BSS ID (hereinafter referred to as the "target interference signal"), if the target interference signal is not received after the time indicated by the Duration, an interference measurement report is sent, and when the target interference signal is received before the time indicated by the Duration, the action of confirming whether there is an interference signal in each time period indicated by the Duration is repeatedly executed. The Figure 14 interference measurement report format can be used for the interference measurement report.

[0128] Before moving from Figure 11 the AP2 to STA2, the interference measurement request S1206 sent by AP2 to STA2 as shown can specify "Type = 0". When "Type = 0" is specified in the interference measurement request S1206, STA2 does not send the interference measurement report of S1207 but monitors until the interference signal is no longer received. For example, in the case where STA2 moves and can no longer receive the interference signal from STA1 / AP1, or other cases where STA2 can no longer receive the interference signal, STA2 sends an interference measurement report. It can also be the case that a report on the situation of receiving the interference signal is made for each time period indicated by the Duration.

[0129] For example, Measurement Type = 1 indicates the following method: after the time indicated by the Duration has passed since receiving the format of the interference measurement request, it is sent in the interference measurement report whether there is a target interference signal. The Figure 14 interference measurement report format can be used for the interference measurement report. In the interference measurement requests S1203 and S1213 sent from AP1 to STA1 shown in this embodiment, "Type = 1" can be specified.

[0130] For example, a measurement type = 2 indicates that an interference measurement report is sent when an interference signal of an object is received. In the interference measurement request S1209 sent from AP2 after moving from STA2 to STA2 shown in this embodiment, "type = 2" can be specified. When "type = 2" is specified in the interference measurement request S1209, STA2 monitors without sending the interference measurement report of S1210 until an interference signal is received. For example, in the case where an interference signal of STA1 / AP1 is received when returning to the original location, etc., when STA2 receives an interference signal, STA2 sends an interference measurement report. It can also be that a report of no interference signal received is made every time period shown by the duration, or it can be that the duration is removed from the format when the measurement type = 2. The Figure 14 interference measurement report format can be used for the interference measurement report.

[0131] For example, it can be that a measurement type = 3 indicates that the interference measurement requests specified by measurement types = 0 and 2 are stopped. The Figure 13 format can be used for the interference measurement request.

[0132] In addition, the AP can control the destination and type of the interference measurement request according to the capability information of the STA. For example, it can be that the AP sends an interference measurement request of measurement type = 0 or 2 to the STA that does not need to reduce power consumption, and when an interference measurement report is received from the STA, it sends an interference measurement request of measurement type = 1 to the STA that needs to reduce power consumption. Thus, the interference measurement time and / or the number of interference measurement reports of the STA that needs to reduce power consumption can be reduced, and an increase in power consumption can be prevented. The Figure 14 interference measurement report format can be used for the interference measurement report.

[0133] It can be that by including multiple BSS IDs in the interference measurement request format, an interference signal can be notified to multiple objects using one interference measurement request format.

[0134] In the case of sending to an individual STA, the STA ID can also be removed from the interference measurement request format.

[0135] Figure 14 represents an interference measurement report format. The interference measurement report can be set to the Figure 14 interference measurement report format shown. In addition, Figure 14 shows an example where the type = 5 is set in the multi-AP element.

[0136] Figure 14 The interference measurement report format shown includes "Detect". "Detect" means for Figure 13Presence or absence of interference signals with respect to the object specified in the interference measurement request shown. It can be 0 indicating no interference and 1 indicating interference, or 1 indicating no interference and 0 indicating interference.

[0137] In addition, in the case of a response where the measurement type = 0 or 2 in the interference measurement request format shown Figure 13 the detected field can be removed, or an Ack can be sent instead of the interference measurement report.

[0138] For example, when multiple BSS IDs are specified in the interference measurement request format shown Figure 13 the BSS ID of the reporting object can be appended to the interference measurement report format.

[0139] In Figure 13 and Figure 14 examples of the formats of the interference measurement request and interference measurement report using the multi - AP element are shown. However, for example, in the case of a wired connection between APs, the interference measurement request and interference measurement report can also be notified via a higher layer. In this case, the information shown in the interference measurement request and interference measurement report can be notified using MLME - MULTIAP - RECONFIGURATION.request and / or MLME - MULTIAP - RECONFIGURATION.response.

[0140] (Embodiment 2)

[0141] In one aspect of the present disclosure, a list of coordinated communication APs in which coordinated communication can be effective in each coordination method is notified. In one aspect of the present disclosure, a group (hereinafter referred to as "coordinated communication group") composed of APs in which coordinated communication can be effective is created, and the APs included in the coordinated communication group perform coordinated communication. It can be that the structures of the STA and AP are the same as those shown in Embodiment 1.

[0142] <Example 4>

[0143] Hereinafter, as an example, an example of the state of coordinated communication configured with 4 APs and 4 STAs as shown Figure 15 will be described. In addition, in the configuration shown Figure 15 STA1 is associated with AP1, STA2 is associated with AP2, STA3 is associated with AP3, and STA4 is associated with AP4. In addition, the coordinated group lists of AP1, AP2, AP3, and AP4 shown in Example 1 are all (AP1, AP2, AP3, AP4).

[0144] Each AP can create a coordinated communication group based on the coordinated group.

[0145] For example, the coordination methods C-OFDMA, C-TDMA, C-CSR, and C-BF are coordination methods that can be effective in the presence of interference effects between the AP and the STA. It is possible to create a list of APs with interference effects (hereinafter referred to as the "interference effect list") for each AP, and use the APs included in the interference effect list to execute the coordination methods C-OFDMA, C-TDMA, C-CSR, or C-BF.

[0146] The coordination method JT can, for example, be to transmit data sent between multiple APs while the multiple APs perform a simultaneous transmission operation. When the method is JT, in the case where the APs are wirelessly connected and have a low MCS (Modulation and Coding Scheme), that is, when the path loss between the APs is large, the transmission bandwidth and / or transmission time required for data transmission between the APs increases, so the throughput decreases. That is, the group of APs for which JT can be effective is a group composed of APs connected by a wired method and / or APs with a small path loss between the APs. The list of APs for which JT can be effective is called the JT list. In addition, a case where the path loss as the distance between the APs is sufficiently small compared to the radio wave arrival distance of the APs can be regarded as a case where the path loss between the APs is small. The coordination method JT can be executed using the APs included in the JT list.

[0147] For the Figure 15 In the configuration shown, an example of the operation of AP2 to create an interference effect list will be described.

[0148] Each AP creates a coordination group list through the same operation as the multi-AP setup shown in Embodiment 1 and Embodiment 2, and when receiving a beacon from an AP included in the coordination group list, appends the AP that sent the received beacon to the interference effect list. In the Figure 15 In the configuration example shown, the interference effect list of AP2 is (AP1, AP3). In addition, each AP can send an interference measurement request for other APs and STAs associated with other APs to the associated STA. This interference measurement request can be, for example, an interference measurement request format specifying measurement type = 2. The STA that receives the interference measurement request can send an interference measurement report to the AP.

[0149] In the Figure 15 In the configuration example shown, STA2 associated with AP2 receives a frame sent by STA4. It is possible to send the fact that there is an interference effect from AP4 to AP2 in the interference measurement report format shown in the Figure 14 shown according to the BSS color included in the preamble of the received frame. AP2 can append AP4 to the interference effect list.

[0150] For the Figure 15In the configuration shown, the operation example in which AP2 creates a JT list will be described.

[0151] Each AP creates a coordination group list through the same operation as the multi-AP setup S601 shown in Embodiment 1 and Embodiment 2. When a beacon is received from an AP included in the coordination group list, the AP that has transmitted the beacon with the larger received power is added to the JT list. In Figure 15 the configuration example shown, it may be that AP2 adds AP1 to the JT list.

[0152] Figure 16 An example of the coordination communication group list notification format is shown. For example, Figure 16 the coordination communication group list notification format shown can be used to send the coordination communication groups created by each AP to the APs and / or coordinator APs included in the coordination communication group. It may be that when the coordination communication group list owned by each AP is inconsistent with the coordination communication group list received from other APs, for example, Figure 9 the update notification format shown is sent to the AP and / or coordinator AP that has sent the received coordination communication group list, thereby requesting modification of the coordination communication group list. It may be that in the modification request, in addition to Figure 9 the update notification format shown, as an object of update, for example, a Figure 16 coordination type (Coordination Type) shown is also appended.

[0153] In this way, by creating a coordination communication group, an AP can select available APs according to the coordination method executed. In addition, by sending the coordination communication group list from each AP to the APs and / or coordinator APs included in the coordination communication group, the coordination communication group lists held by the APs performing coordination communication can be made the same list.

[0154] [Format Example]

[0155] Figure 16 The coordination communication group list notification format is shown. The coordination communication group list notification can be notified using Figure 16 the coordination communication group list notification format shown. In addition, Figure 16 an example in which the type = 6 is set in the multi-AP element is shown.

[0156] The coordination communication group list notification format includes a coordination group ID (Coordination Group ID), a coordination type (Coordination Type), a number of BSSs (num BSS), and a BSS ID.

[0157] The coordination group ID indicates Figure 8Identifiers with the same coordination group ID as shown. The coordination type indicates the coordination method of a coordination communication group list such as an interference impact list or a JT list. The number of BSSs is the number of APs included in the coordination communication group list of the coordination method indicated by the coordination type, and it shows the number of BSS IDs immediately following the number of BSSs. The BSS ID is the ID of the AP included in the coordination communication group list of the coordination method indicated by the coordination type, and it represents the ID of the AP constituting the coordination communication group list.

[0158] In the case of a list where the coordination type is JT, the number of STAs to be the object and the STA IDs can also be appended to the format.

[0159] As described above, although the embodiments have been described with reference to the drawings, the present disclosure is not limited to this example. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope described in the claims. It should be understood that these modification examples or correction examples also belong to the technical scope of the present disclosure. Additionally, within the scope not departing from the gist of the present disclosure, the structural elements in the embodiments can be arbitrarily combined.

[0160] In the above embodiments, the expression "section" used for each structural element can also be replaced with other expressions such as "... circuitry", "... assembly", "device", "unit", or "module".

[0161] The present disclosure can be implemented by software, hardware, or software in cooperation with hardware. Each functional block used in the description of the above embodiments can also be partially or wholly implemented as an LSI (Large Scale Integration, large-scale integrated circuit) as an integrated circuit. Each process described in the above embodiments can also be partially or wholly controlled by one LSI or a combination of LSIs. The LSI can be composed of individual chips or can be composed of one chip in a manner that includes part or all of the functional blocks. The LSI can also include data input and output. Depending on the degree of integration, the LSI is sometimes referred to as "IC (Integrated Circuit)", "system LSI", "ultra-large LSI", or "extra-large LSI".

[0162] The method of integrating circuits is not limited to LSI, and can also be implemented by dedicated circuits, general-purpose processors, or dedicated processors. Additionally, FPGA (Field Programmable Gate Array), which can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection or setting of circuit blocks inside the LSI can also be utilized. This disclosure can also be implemented as digital processing or analog processing.

[0163] Furthermore, if, with the progress of semiconductor technology or the derivation of other technologies, an integrated circuit technology that replaces LSI emerges, of course, this technology can also be used to achieve the integration of functional blocks. There is also the possibility of applying biotechnology and so on.

[0164] This disclosure can be implemented in all types of devices, equipment, and systems with communication functions (collectively referred to as "communication devices"). A communication device may also include a wireless transceiver and a processing / control circuit. The wireless transceiver may also include a receiving unit and a transmitting unit, or perform the functions of these parts. The wireless transceiver (transmitting unit, receiving unit) may also include an RF (Radio Frequency) module and one or more antennas. The RF module may also include an amplifier, an RF modulator / demodulator, or devices similar to these. Non-limiting examples of communication devices include: telephones (mobile phones, smart phones, etc.), tablet computers, personal computers (PCs) (laptop computers, desktop computers, notebook computers, etc.), cameras (digital cameras, digital video cameras, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smart watches, tracking devices, etc.), game consoles, e-book readers, remote health / telemedicine (remote healthcare / medical prescription) devices, transportation vehicles or means of transportation with communication functions (automobiles, airplanes, ships, etc.), and combinations of the above various devices.

[0165] Communication devices are not limited to portable or mobile devices, and also include all types of devices, equipment, and systems that are not portable or are fixed. For example, it includes: smart home devices (home appliances, lighting devices, smart meters or gauges, control panels, etc.), vending machines, and all "Things" that can exist on the IoT (Internet of Things) network.

[0166] Communication includes not only data communication through cellular systems, wireless LAN (Local Area Network) systems, communication satellite systems, etc., but also data communication through combinations of these systems.

[0167] In addition, the communication device also includes devices such as a controller or a sensor that are connected or linked to a communication device that executes the communication function described in the present invention. For example, it includes a controller or a sensor that generates a control signal or a data signal used by the communication device that executes the communication function of the communication device.

[0168] In addition, the communication device includes infrastructure devices that communicate with or control the above-mentioned various non-limiting devices, such as base stations, access points, and all other devices, equipment, and systems.

[0169] In recent years, in IoT (Internet of Things) technology, CPS (Cyber Physical Systems), a new concept that creates new added value through information cooperation between the physical space and the information space, has attracted much attention. In the above-described embodiment, this CPS concept can also be adopted.

[0170] That is, as a basic configuration of CPS, for example, it is possible to connect an edge server configured in the physical space to a cloud server configured in the information space via a network, and perform distributed processing by processors mounted on both servers. Here, each processing data generated in the edge server or the cloud server is preferably generated on a standardized platform. By using such a standardized platform, the efficiency of building a system including various sensor groups or IoT application software can be improved.

[0171] (1) An access point according to an embodiment of the present disclosure includes: a transceiver unit that transmits and receives information related to the reconstruction of coordinated communication; and a control unit that reconstructs coordinated communication based on the received information related to the reconstruction of coordinated communication.

[0172] (2) An access point according to an embodiment of the present disclosure is such that, in the access point of (1), the transceiver unit transmits information related to a change in the operation of the access point to surrounding access points.

[0173] (3) An access point according to an embodiment of the present disclosure is such that, in the access point of (1), the control unit adds an access point notified of addition or deletion to or deletes it from the access points performing coordinated communication.

[0174] (4) An access point according to an embodiment of the present disclosure is such that, in the access point of (1), the reconstruction of the coordinated communication is performed according to the influence of interference.

[0175] (5) An access point according to an embodiment of the present disclosure is, among the access points in (4), the influence of the interference is based on a result obtained by measuring the influence of interference from an access point for coordinated communication and a terminal associated with the access point for coordinated communication.

[0176] (6) An access point according to an embodiment of the present disclosure is, among the access points in (4), the information related to the reconstruction of coordinated communication is information related to an access point where coordinated communication can be effective considering the influence of the interference.

[0177] (7) An access point according to an embodiment of the present disclosure is, among the access points in (1), the information related to the reconstruction of coordinated communication is information related to an access point where coordinated communication can be effective in each coordination method.

[0178] (8) In a method for controlling coordinated communication according to an embodiment of the present disclosure, an access point performs the following steps: receiving information related to the reconstruction of coordinated communication; and reconstructing coordinated communication based on the received information.

[0179] The disclosures of the specification, drawings, and abstract of the Japanese patent application No. 2022-201270 filed on December 16, 2022, are incorporated herein by reference in their entirety.

[0180] Industrial Applicability

[0181] The present disclosure is useful for coordinated communication.

[0182] Description of Reference Numerals

[0183] 300: STA

[0184] 301, 401: Transmission Frame Generation Unit

[0185] 302: Control Circuit

[0186] 303: Wireless Transceiver Circuit

[0187] 304: Frame Reception Unit

[0188] 305, 405: Reception Quality Measurement Unit

[0189] 306, 407: Control Unit

[0190] 400: AP

[0191] 402: Control Circuit

[0192] 403: Wireless Transceiver Circuit

[0193] 404: Received Frame Decoding Unit

[0194] 406: Coordination Control Department

Claims

1. An access point, characterized in that, Comprising: a transceiver unit that transmits and receives information related to the reconstruction of coordinated communication; and a control unit that reconstructs coordinated communication based on the received information related to the reconstruction of coordinated communication.

2. The access point according to claim 1, wherein the transceiver unit transmits information related to a change in the operation of the access point to surrounding access points.

3. The access point according to claim 1, wherein the control unit adds an access point notified of addition or deletion to the access points performing coordinated communication or deletes it from the access points performing coordinated communication.

4. The access point according to claim 1, wherein the reconstruction of coordinated communication is performed according to the influence of interference.

5. The access point according to claim 4, wherein the influence of the interference is based on the result of measuring the influence of interference from the access points of coordinated communication and the terminals associated with the access points of coordinated communication.

6. The access point according to claim 4, wherein the information related to the reconstruction of coordinated communication is information related to the access points where coordinated communication can be effective considering the influence of the interference.

7. The access point according to claim 1, wherein the information related to the reconstruction of coordinated communication is information related to the access points where coordinated communication can be effective in each coordination method.

8. A control method for coordinated communication, characterized in that an access point performs the following steps: receiving information related to the reconstruction of coordinated communication; and reconstructing coordinated communication according to the received information.

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