Cluster cooperation group establishment method based on orthogonal frequency division multiple access in aerial wireless network

Abstract

The application discloses a cluster cooperation group establishment method based on orthogonal frequency division multiple access in an aerial wireless network. A center cluster head node is selected from a plurality of clan heads, and a cluster cooperation group is established by the center cluster head node. Through cooperation between clusters, partial information sharing between APs can be realized, so that a more optimal decision can be made collectively or independently, which is beneficial to interference management, spatial multiplexing, efficient transmission and other technologies, and further improves the overall performance of the aerial wireless network.

Description

Technical Field

[0001] This invention belongs to the field of aviation networks and is a fast cluster establishment technology. It proposes a method for fast establishment of cluster cooperative groups based on orthogonal frequency division multiple access. Background Technology

[0002] Aviation systems, with their characteristics of long-range operation, precision strike, rapid response, and flexibility, play a crucial role in future warfare and weapon systems. Currently, aviation technology is developing rapidly, with collaboration, networking, and unmanned operation becoming new development trends and requirements. In particular, aviation wireless collaborative networks, with multi-aircraft platforms and UAV swarms as typical applications, have become a key focus and challenge.

[0003] In aviation wireless cooperative networks, due to the large number of network nodes, wide geographical distribution, and different roles of nodes, it is difficult to meet the requirements of aviation wireless networks for quality of service assurance for diversified services by adopting either purely distributed cooperation (i.e., all nodes in the aviation network are completely equal) or purely centralized cooperation (i.e., there is a centralized control node in the aviation network that controls the entire network). Summary of the Invention

[0004] The purpose of this invention is to provide a cluster cooperation group establishment method based on orthogonal frequency division multiple access in an aviation wireless network, which can quickly establish a central cluster head node and form a cluster cooperation group for aviation wireless cooperative networks, so as to facilitate cooperation between aviation nodes.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A method for establishing a cluster cooperative group based on orthogonal frequency division multiple access in an aviation wireless network includes the following steps:

[0007] Step 1, selection of the central cluster head node, includes the following steps:

[0008] Step 11: The convener sends a cooperation trigger frame to the convened cluster head. At this time, the cooperation trigger frame has a type field indicating that the subtype of the cooperation trigger frame is the election of the central cluster head node.

[0009] Step 12: After receiving the cooperation trigger frame sent by the calling cluster, the called cluster head sends the first reply information in OFDMA mode to provide feedback;

[0010] Step 13: After receiving the first response information from each of the summoned cluster heads, the central cluster head node of this cluster cooperative group is determined, and then the address of the central cluster head node is broadcast.

[0011] Step 14: After receiving the collaboration notification frame from the initiating cluster head, the central cluster head node sends a collaboration confirmation frame to all cluster heads in the local collaboration group to establish the central cluster head node.

[0012] Step 2: Establish a cluster collaboration group from the central cluster head node.

[0013] Preferably, the first response message is: message = {num, dB, T}, where num is the number of surrounding cluster heads perceived by the summoned cluster head, dB is the signal strength, and T is its own beacon frame period.

[0014] Preferably, in step 11, the bandwidth resources in the cooperative trigger frame are divided into several OFDMA sub-channels, and a portion of the summoned cluster heads are scheduled to feed back the first response information on the corresponding sub-channels, while the other portion of the OFDMA sub-channels are used for random competition, and a competition probability P is specified.

[0015] In step 12, if the called cluster head is explicitly scheduled by the called cluster head, it will provide feedback on the corresponding OFDMA sub-channel; if it is not scheduled by the called cluster head, but wants to be the central cluster head node, it will provide feedback on the randomly contested sub-channel with a contest probability P.

[0016] Furthermore, step two includes the following steps:

[0017] Step 21: The central cluster head node sends a cooperation trigger frame to the summoned cluster heads. At this time, the cooperation trigger frame has a type field indicating that the subtype of the cooperation trigger frame is the establishment of a cluster cooperation group.

[0018] Step 22: After receiving the cooperation trigger frame from the central cluster head node, the summoned cluster head sends a second reply message in OFDMA mode to provide feedback;

[0019] Step 23: After receiving the second reply information from each of the summoned cluster heads, the central cluster head node sends a cooperation notification frame to formally notify the establishment of the cooperation group in this cluster;

[0020] Step 24: After receiving the cooperation notification frame, the member nodes of the cluster cooperation group send an acknowledgment frame in OFDMA mode to establish the cluster cooperation group.

[0021] Ideally, the second response should only indicate whether you agree to join or disagree to join.

[0022] Preferably, in step 23, the collaboration notification frame format is: message co = {ID, address, list, para}, where ID is the identifier of the cluster cooperative group, address is the address of the cluster head node, list is the list of addresses of the member nodes of the cluster cooperative group, and para is other basic parameters of the cluster.

[0023] Preferably, in step 21, the bandwidth resources in the cooperative trigger frame are divided into several OFDMA sub-channels, and a portion of the summoned cluster heads are scheduled to feed back the second response information on the corresponding sub-channels, while the other portion of the OFDMA sub-channels are used for random competition, and a competition probability P is specified.

[0024] In step 22, if the convened cluster head is explicitly scheduled by the central cluster head node, it will provide feedback on the corresponding OFDMA sub-channel; if it is not scheduled by the central cluster head node but wants to join this cluster cooperation group, it will provide feedback confirmation or apply to join on a randomly contested sub-channel with probability P. Attached Figure Description

[0025] Figure 1 A schematic diagram of the selection process for the central cluster head node.

[0026] Figure 2 A schematic diagram of the process for establishing a cluster collaboration group. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0028] By forming clusters (or groups) from several nodes within a local area, and selecting a cluster head node for each cluster, aeronautical wireless network cooperation can be carried out through inter-cluster collaboration, achieving good results in terms of efficiency and complexity. The Orthogonal Frequency Division Multiple Access (OFDMA) approach requires the participation of multiple cluster heads to establish more efficient cooperative relationships. This embodiment addresses an aeronautical wireless cooperative network composed of multiple aeronautical nodes. Multiple nodes within a local area in this network can spontaneously form clusters and elect cluster heads. Thus, the network encompasses multiple clusters, each with a cluster head. Clusters then collaborate through their respective cluster heads. However, for efficiency, a central cluster head node should be elected from among these cluster heads to facilitate coordination and reduce network control overhead. The set of clusters that have established cooperative relationships is called a cluster cooperation group.

[0029] Inter-cluster cooperation enables partial information sharing among access points (APs), allowing for better collective or independent decision-making. This benefits technologies such as interference management, spatial reuse, and efficient transmission, ultimately improving the overall performance of the aviation wireless network. However, a crucial prerequisite for effective inter-cluster cooperation is the spontaneous, rapid, and efficient establishment of different clusters. Specifically, for efficiency, a cluster head (central cluster head node) often plays a primary coordinating role among established clusters. Determining a suitable central cluster head node is a key technical challenge. After selecting the central cluster head node, establishing a cluster cooperation group is another critical issue. Therefore, this embodiment employs a two-step process to establish the cluster cooperation group:

[0030] Step 1: Selection of the central cluster head node, see [link / reference] Figure 1 As shown, it includes the following steps:

[0031] Step 11: The clustered aerospace wireless network includes cluster head nodes. One of these cluster head nodes is designated as the initiating cluster head. The initiating cluster head sends a cooperation trigger frame to trigger other surrounding cluster heads to send back their first response information, thus selecting the central cluster head node of the cluster cooperation group. This cooperation trigger frame contains a type field indicating that its subtype is central cluster head node election. The other surrounding cluster heads are referred to as the initiating cluster heads. Any cluster head node can act as the initiating cluster head, but it is often recommended that a cluster head node with a large number of surrounding cluster heads act as the initiating cluster head, as this is more effective. The cooperation trigger frame divides the bandwidth resources into several OFDMA sub-channels and explicitly schedules a portion of the initiating cluster heads to send back their first response information on the corresponding sub-channels. The other portion of the OFDMA sub-channels is used for random contention, and a contention probability P is specified.

[0032] Step 12: After receiving the cooperation trigger frame sent by the calling cluster, the called cluster head sends a first response message via OFDMA. The first response message is: message = {num, dB, T}, where num is the number of surrounding cluster heads perceived by the called cluster head, dB is the signal strength, and T is its own beacon frame period, etc. If the called cluster head is explicitly scheduled by the called cluster head, it will respond on the corresponding OFDMA sub-channel; if it is not scheduled by the called cluster head but still wants to act as the central cluster head node, it can respond on a randomly contested sub-channel with a contention probability P.

[0033] Step 13: After receiving the first response information from each of the convened cluster heads, the convening cluster head determines the central cluster head node of its cooperative group. Then, the convening cluster head sends a cooperation notification frame to broadcast the address of the central cluster head node.

[0034] The algorithm for determining the central cluster head node of the cooperating group by the convening cluster is not covered by this invention. This embodiment provides an example algorithm as follows: the cluster head node with the most surrounding cluster heads (including the convening cluster head and the convened cluster head) is selected as the central cluster head node. Then, the convening cluster head sends a cooperation notification frame to broadcast the address of the central cluster head node.

[0035] Step 14: After receiving the collaboration notification frame from the initiating cluster head, the central cluster head node sends a collaboration confirmation frame to all cluster heads in the local collaboration group to establish the central cluster head node.

[0036] Step 2: Establishing a cluster collaboration group (see below) Figure 2 As shown, it includes the following steps:

[0037] Step 21: The central cluster head node sends a cooperation trigger frame to prompt other surrounding cluster heads to respond whether to join the cluster cooperation group. This cooperation trigger frame contains a type field indicating that its subtype is cluster cooperation group establishment. The cooperation trigger frame divides bandwidth resources into several OFDMA sub-channels and explicitly schedules a portion of the recruited cluster heads to respond with second reply information on the corresponding sub-channels. The remaining OFDMA sub-channels are used for random contention, and a contention probability P is specified.

[0038] Step 22: After receiving the cooperation trigger frame from the central cluster head node, the called cluster head sends a second response message via OFDMA. The second response message only needs to indicate agreement to join (ACK) or disagreement to join (NAK). If the called cluster head is explicitly scheduled by the central cluster head node, it will respond on the corresponding OFDMA sub-channel; if it is not scheduled by the central cluster head node but wants to join this cluster cooperation group, it can respond with probability P on a randomly contested sub-channel to confirm or request to join.

[0039] Step 23: After receiving the second response messages from each of the convened cluster heads, the central cluster head node sends a cooperation notification frame to formally notify the establishment of the cooperation group within its cluster. The cooperation notification frame format is: message co = {ID, address, list, para}, where ID is the identifier of the cluster cooperative group, address is the address of the cluster head node, list is the list of addresses of the member nodes of the cluster cooperative group, and para is other basic parameters of the cluster.

[0040] Step 24: After receiving the cooperation notification frame, the member nodes of the cluster cooperation group send an acknowledgment frame in OFDMA mode to establish the cluster cooperation group.

[0041] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A method for establishing a cluster cooperative group based on orthogonal frequency division multiple access in an aviation wireless network, characterized by the following steps: Step 1, selection of the central cluster head node, includes the following steps: Step 11: The convener sends a cooperation trigger frame to the convened cluster head. At this time, the cooperation trigger frame has a type field indicating that the subtype of the cooperation trigger frame is the election of the central cluster head node. Step 12: After receiving the cooperation trigger frame sent by the calling cluster, the called cluster head sends the first reply information in OFDMA mode to provide feedback; the first reply information is: message = {num, dB, T}, where num is the number of surrounding cluster heads perceived by the called cluster head, dB is the signal strength, and T is its own beacon frame period; Step 13: After receiving the first response information from each of the summoned cluster heads, the central cluster head node of this cluster cooperative group is determined, and then the address of the central cluster head node is broadcast. Step 14: After receiving the cooperation notification frame from the initiating cluster head, the central cluster head node sends a cooperation confirmation frame to all cluster heads in the local cluster cooperation group to establish the central cluster head node. Step 2: Establish a cluster cooperative group from the central cluster head node, which includes the following steps: Step 21: The central cluster head node sends a cooperation trigger frame to the summoned cluster heads. At this time, the cooperation trigger frame has a type field indicating that the subtype of the cooperation trigger frame is the establishment of a cluster cooperation group. Step 22: After receiving the cooperation trigger frame from the central cluster head node, the summoned cluster head sends a second response message in OFDMA mode to provide feedback. The second response message only needs to indicate whether it agrees to join or disagrees to join. Step 23: After receiving the second reply information from each of the summoned cluster heads, the central cluster head node sends a cooperation notification frame to formally notify the establishment of the cooperation group in this cluster; Step 24: After receiving the cooperation notification frame, the member nodes of the cluster cooperation group send an acknowledgment frame in OFDMA mode to establish the cluster cooperation group.

2. The cluster cooperation group establishment method based on orthogonal frequency division multiple access in an aviation wireless network according to claim 1, characterized in that... In step 11, the bandwidth resources are divided into several OFDMA sub-channels in the cooperative trigger frame, and a portion of the summoned cluster heads are scheduled to feed back the first response information on the corresponding sub-channels. The other portion of the OFDMA sub-channels are used for random competition, and a competition probability P is specified. In step 12, if the called cluster head is explicitly scheduled by the called cluster head, it will provide feedback on the corresponding OFDMA sub-channel; if it is not scheduled by the called cluster head, but wants to be the central cluster head node, it will provide feedback on the randomly contested sub-channel with a contest probability P.

3. The cluster cooperation group establishment method based on orthogonal frequency division multiple access in an aviation wireless network according to claim 1, characterized in that... In step 23, the collaboration notification frame format is: message co = {ID, address, list, para}, where ID is the identifier of the cluster cooperative group, address is the address of the cluster head node, list is the list of addresses of the member nodes of the cluster cooperative group, and para is other basic parameters of the cluster.

4. The cluster cooperation group establishment method based on orthogonal frequency division multiple access in an aviation wireless network according to claim 1, characterized in that... In step 21, the bandwidth resources are divided into several OFDMA sub-channels in the cooperative trigger frame, and a portion of the summoned cluster heads are scheduled to feed back the second response information on the corresponding sub-channels. The other portion of the OFDMA sub-channels are used for random competition, and a competition probability P is specified. In step 22, if the convened cluster head is explicitly scheduled by the central cluster head node, it will provide feedback on the corresponding OFDMA sub-channel; if it is not scheduled by the central cluster head node but wants to join this cluster cooperation group, it will provide feedback confirmation or apply to join on a randomly contested sub-channel with probability P.

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