Frequency point coordination method and system of communication network

Abstract

The invention discloses a frequency point coordination method and system of a communication network, each subnet in the communication network establishes a frequency point preference list of the subnet according to a gain index of the subnet to each frequency point, each subnet can generate request matching information for a preferred frequency point according to the frequency point preference list, and each subnet broadcasts the request matching information to other subnets. And when the subnet receives broadcast information sent by other subnets, simulating a prediction gain index of the preference frequency point in the request matching information, and judging whether the preference frequency point is reserved in the frequency point preference list or not according to the prediction gain index. And finally, matching the subnets in the subnets corresponding to the received matching request information by the frequency point. In this way, a stable subnet matching result can be converged in finite steps, so that different subnets can obtain relatively ideal frequency point resources. And each sub-network only needs to receive the request matching information broadcasted by other sub-networks and perform virtual decision locally, so that the communication overhead required by frequency point coordination can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication frequency coordination, in particular to a frequency point coordination method and system of a communication network. BACKGROUND

[0002] At present, frequency coordination between different subnets of a communication network is crucial for efficient and reliable communication of the wireless communication network. However, the current subnet communication has the problem that the subnets occupy the same frequency point resources, resulting in co-channel interference, and the current communication overhead for frequency coordination between subnets is large. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a frequency point coordination method and system of a communication network, which can improve the rationality of matching frequency points of each subnet in the communication network and reduce the communication overhead of coordination.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is: A frequency point coordination method of a communication network, comprising the steps of: establishing a frequency point preference list of each subnet according to the gain index of each subnet to the frequency points in a frequency point set; generating request matching information of preferred frequency points by each subnet according to the frequency point preference list, the request matching information containing the gain index of the preferred frequency points of the subnet; broadcasting the request matching information by each subnet to the remaining subnets; when each subnet receives the request matching information, calculating the predicted gain index of the preferred frequency points in the request matching information, and judging whether to keep the preferred frequency points in the frequency point preference list according to the predicted gain index; matching the frequency points in the subnets corresponding to the received request matching information.

[0005] To solve the above technical problems, another technical scheme adopted by the present application is: A frequency point coordination system of a communication network, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement each step of the above-mentioned frequency point coordination method of a communication network.

[0006] The beneficial effect of the present application is that each sub-network in the communication network establishes a frequency point preference list of the sub-network according to the gain index of each frequency point of the sub-network, each sub-network can generate request matching information for the preferred frequency point according to the frequency point preference list, and each sub-network broadcasts the request matching information to the remaining sub-networks. When a sub-network receives the broadcast information sent by other sub-networks, the predicted gain index of the preferred frequency point in the request matching information is simulated, and whether the preferred frequency point is retained in the frequency point preference list is judged according to the predicted gain index. Finally, the frequency point is matched in the sub-network corresponding to the received request matching information. In this way, a stable sub-network matching result can be converged within a limited step, so that different sub-networks can obtain relatively ideal frequency point resources. Moreover, each sub-network only needs to receive the request matching information broadcast by other sub-networks and make a virtual decision locally, so that the communication overhead required for frequency point coordination can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 A flow chart of a frequency point coordination method of a communication network according to an embodiment of the present application; Figure 2 A schematic diagram of a frequency point coordination system of a communication network according to an embodiment of the present application; Figure 3 A specific step flow chart of a frequency point coordination method of a communication network according to an embodiment of the present application.

[0008] REFERENCE NUMERALS: 1. A frequency point coordination system of a communication network; 2. A memory; 3. A processor. DETAILED DESCRIPTION

[0009] To make the technical content, the achieved purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0010] Please refer to Figure 1 The embodiment of the present application provides a frequency point coordination method of a communication network, which comprises the following steps: establishing a frequency point preference list of each sub-network according to the gain index of each frequency point in a frequency point set in each sub-network in the communication network; each sub-network generates request matching information of a preferred frequency point according to the frequency point preference list, and the request matching information contains the gain index of the preferred frequency point of the sub-network; each sub-network broadcasts the request matching information to the remaining sub-networks; when each sub-network receives the request matching information, the predicted gain index of the preferred frequency point in the request matching information is calculated, and whether the preferred frequency point is retained in the frequency point preference list is judged according to the predicted gain index; the frequency point is matched in the sub-network corresponding to the received request matching information.

[0011] From the above description, the beneficial effects of the present application are that: each subnetwork in the communication network establishes a frequency point preference list of the subnetwork according to the gain index of the subnetwork to each frequency point, each subnetwork can generate request matching information for the preferred frequency point according to the frequency point preference list, and each subnetwork broadcasts the request matching information to the remaining subnetworks. When a subnetwork receives the broadcast information sent by other subnetworks, the predicted gain index of the preferred frequency point in the request matching information is simulated, and whether the preferred frequency point is retained in the frequency point preference list is judged according to the predicted gain index. Finally, the frequency point is matched in the subnetwork corresponding to the received request matching information. In this way, a stable subnetwork matching result can be converged within a limited step, so that different subnetworks can obtain relatively ideal frequency point resources. Moreover, each subnetwork only needs to receive the request matching information broadcast by other subnetworks and make a virtual decision locally, so that the communication overhead required for frequency point coordination can be reduced.

[0012] Further, the gain index of each subnetwork to the frequency points in the frequency point set in the communication network is established according to the gain index of each subnetwork to the frequency points in the frequency point set, and the previous includes: The spectrum sensing of a frequency point in the frequency point set is performed by a service node of a subnetwork in the communication network, and a first sensing result is obtained; The spectrum sensing of the frequency point is performed by a center node of the subnetwork, and a second sensing result is obtained; The gain index of the center node of the subnetwork to the frequency point is calculated in combination with the first sensing result, the second sensing result, the current matched frequency point data and the current idle frequency point data.

[0013] From the above description, for each subnetwork in the communication network, the gain index of the subnetwork to the frequency point can be calculated according to the spectrum sensing result of the service node to the frequency point and the spectrum sensing result of the center node to the frequency point; and the preference for the current matched frequency point and the idle frequency point is considered in the calculation process of the gain index, so that a reasonable gain index can be calculated.

[0014] Further, the gain index of each subnetwork to the frequency points in the frequency point set in the communication network is established according to the gain index of each subnetwork to the frequency points in the frequency point set, and the previous includes: For each subnetwork in the communication network, the gain index of the subnetwork to each frequency point in the frequency point set is sorted in descending order to generate a frequency point preference list of the subnetwork.

[0015] From the above description, the greater the gain index of the subnetwork to the frequency point, the more preferred the frequency point is, so the gain index of the subnetwork to each frequency point is sorted in descending order to generate a frequency point preference list of the subnetwork, so that the subnetwork can obtain relatively ideal frequency point resources.

[0016] Further, the request matching information of the preferred frequency point is generated by each subnetwork according to the frequency point preference list, including: For each sub-network in the communication network, a sub-network selects a frequency point with the highest gain index from the frequency point preference list as a preferred frequency point, and generates request matching information of the preferred frequency point.

[0017] As can be seen from the above description, the sub-network selects a frequency point with the highest gain index from the frequency point preference list as a preferred frequency point, which can reduce the overall sub-network matching time.

[0018] Further, the request matching information is broadcasted by each sub-network to the remaining sub-networks, and further includes: The request matching information of the adjacent sub-networks is broadcasted by each sub-network to the remaining sub-networks.

[0019] As can be seen from the above description, the sub-network broadcasts the request matching information of the adjacent sub-networks, which can reduce the sub-network hiding.

[0020] Further, whether to keep the preferred frequency point in the frequency point preference list is determined according to the predicted gain index, and includes: In the sub-network, when the predicted gain index is greater than the gain index in the request matching information, the preferred frequency point is kept in the frequency point preference list of the sub-network. Otherwise, the preferred frequency point is deleted from the frequency point preference list of the sub-network.

[0021] As can be seen from the above description, when the sub-network receives the request matching information, the preferred frequency point in the request matching information is matched and simulated, if the simulated gain index is less than the gain index in the request matching information, that is, the simulation matching of the sub-network to the frequency point is rejected, the frequency point is deleted from the frequency point preference list of the sub-network, which can reduce the overall sub-network matching time.

[0022] Further, the frequency point is matched in the sub-network corresponding to the received request matching information, and includes: If the frequency point is in an un-matched state, the sub-network with the maximum gain index in the received request matching information is selected for matching, and the remaining sub-networks corresponding to the request matching information are rejected.

[0023] Further, the frequency point is matched in the sub-network corresponding to the received request matching information, and includes: If the frequency point is in a matched state, it is determined whether the gain index of the matched sub-network of the frequency point is greater than the gain index in each received request matching information, if not, the matched sub-network is rejected, and the sub-network with the maximum gain index in the received request matching information is selected for matching.

[0024] From the above description, after receiving the request matching information, the subnetwork with the largest gain index in the matchable subnetwork can be selected, and different subnetworks can obtain relatively ideal frequency point resources.

[0025] Further, the subnetwork is matched by the frequency point in the subnetwork corresponding to the received request matching information, and then includes: If there is a subnetwork that does not match the frequency point, the subnetwork of the unmatched frequency point is returned to the step of broadcasting the request matching information to the remaining subnetworks by each subnetwork, until all subnetworks match the frequency point.

[0026] From the above description, each round re-matches the unmatched subnetwork to complete the matching of all subnetworks within a limited number of steps.

[0027] Please refer to Figure 2 Another embodiment of the application provides a frequency point coordination system of a communication network, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements each step of the above-mentioned frequency point coordination method of the communication network when executing the computer program.

[0028] The above-mentioned frequency point coordination method and system of the communication network are suitable for improving the rationality of matching frequency points of each subnetwork in the communication network and reducing the communication overhead of coordination. Please refer to Figure 1 An embodiment of the application is: A frequency point coordination method of a communication network, characterized in that it comprises the following steps: S1, establishing a frequency point preference list of each subnetwork according to the gain index of each frequency point in the frequency point set of each subnetwork in the communication network.

[0029] Specifically, the state of all subnetworks in the communication network is initialized as unmatched, and the state of all frequency points in the frequency point set is initialized as unmatched.

[0030] First, the spectrum sensing of a frequency point in the frequency point set is performed by the business node of a subnetwork in the communication network to obtain a first sensing result, and the spectrum sensing of the frequency point is performed by the center node of the subnetwork to obtain a second sensing result; the gain index of the frequency point for the center node of the subnetwork is calculated by combining the first sensing result, the second sensing result, the current matched frequency point data, and the current idle frequency point data.

[0031] Specifically, each subnetwork independently performs spectrum sensing, and each subnetwork center node calculates the gain index of each frequency point according to the received spectrum sensing result reported by the business node in the subnetwork and the result obtained by its own spectrum sensing. Let the number of performed spectrum sensing rounds be T, the spectrum sensing result of the center node itself to the jth frequency point (total of K frequency points) is n N x n,t , where n =1, 2, …, N , t =1, 2, …, T , the spectrum sensing result of the service node in the subnet to the jth frequency point is n x i,n,t , where i =1, 2, …, M . If the spectrum sensing result is 0, it indicates that there is no occupation or interference; if it is 1, it indicates that the frequency point is occupied or interfered). Then the gain index of the center node to the frequency point n can be calculated as:

[0032] In the formula, x n The larger the value is, the more the frequency point n is preferred. α , β ∈(0, 1) is a pre-set parameter for weighting the confidence degree of the spectrum sensing result of the subnet to the service node and the center node in the subnet. gamma , kappa ∈(0, 1) is used to increase the preference to the currently occupied frequency point and the idle frequency point of the subnet, and the reason is that frequent switching of frequency points or exchange of frequency point allocation with other subnets will bring additional signaling overhead, so it is more preferred to stay in the current frequency point or switch to an idle frequency point. rho t represents the time weighting, and in general, a larger weight value is set for the newer spectrum sensing sampling to represent the real-time requirement of spectrum sensing. Through such preference calculation, the preference list of the subnet k can be obtained, denoted as P k , k =1, 2, …, K , K is the number of subnets in the communication network.

[0033] Further, for each subnet in the communication network, the gain index of the subnet to each frequency point in the frequency point set is sorted in descending order to generate a frequency point preference list of the subnet, and the frequency point preference list is maintained by the center node of the subnet.

[0034] S2, each subnet generates request matching information of the preferred frequency point according to the frequency point preference list, and the request matching information includes the gain index of the subnet to the preferred frequency point. ​​​

[0035] Specifically, for each subnet in the communication network, the subnet k From the frequency preference list P k The frequency point with the highest gain index that is not rejected is selected as the preferred frequency point, and request matching information of the preferred frequency point is generated. The request matching information includes the gain index of the subnet for the preferred frequency point.

[0036] S3. Each subnet broadcasts the request matching information to other subnets.

[0037] Specifically, each subnet broadcasts its own request matching information and the request matching information of the adjacent subnet to other subnets, so as to forward the request matching information of the adjacent subnet and avoid the phenomenon of hidden subnets.

[0038] S4. When each subnet receives the request matching information, it calculates a prediction gain index for the preferred frequency in the request matching information, and determines whether to retain the preferred frequency in the frequency preference list according to the prediction gain index.

[0039] Among them, in the subnet, when the predicted gain index is greater than the gain index in the request matching information, the preferred frequency point is retained in the frequency preference list of the subnet; otherwise, the preferred frequency point is deleted from the frequency preference list of the subnet.

[0040] Specifically, after receiving matching request information from other subnets, each subnet simulates a frequency decision locally. Specifically, the subnet compares its gain index for the frequency with the gain index in the matching request information from other subnets. If the gain index in the matching request information from other subnets is greater than the subnet's gain index for the frequency, the subnet rejects the simulated matching for the frequency. The subnet removes the rejected frequency from its preference list. Otherwise, the frequency remains in the preference list.

[0041] S5. Match a subnet in the subnet corresponding to the received request matching information based on the frequency point.

[0042] If the frequency point is in an unmatched state, the subnet with the largest gain index is selected from the received matching request information for matching, and the subnets corresponding to the remaining matching request information are rejected.

[0043] If the frequency point is in a matched state, determine whether the gain index of the matched subnet of the frequency point is greater than the gain index in each received request matching information. If not, reject the matched subnet, select the subnet with the largest gain index in the received request matching information for matching, and reject the subnets corresponding to the remaining request matching information. If so, reject the subnets corresponding to all request matching information.

[0044] Specifically, if a frequency point has a matched subnetwork currently, but receives a request matching information of a subnetwork with a larger gain index, the frequency point rejects the previously matched subnetwork and selects a new subnetwork sending the request matching information to perform matching; the operation corresponding to each node is to update the subnetwork matched by the frequency point in the matched frequency point, and update the state of the subnetwork as matched.

[0045] If there is a subnetwork not matched with a frequency point, the subnetwork not matched with the frequency point is returned to step S2 for execution until all subnetworks are matched with frequency points.

[0046] Therefore, in the embodiment, the frequency point coordination scheme is constructed in a matching game manner, and theoretically, it can be proved that a stable matching can be converged within a limited step, so that different subnetworks can obtain relatively ideal frequency point resources. In addition, since the frequency point itself has no decision-making ability, the embodiment makes a virtual frequency point role in the center node of each subnetwork to make a decision. In each round of matching, each subnetwork only needs to receive the request matching information broadcast by other subnetworks and make a virtual decision locally, so that the communication overhead required for frequency coordination is greatly reduced.

[0047] Meanwhile, each subnetwork only needs to maintain an array of 1 frequency point number x 3 and an array of 1 subnetwork number x 2 in each round of matching. The decision-making process only needs to perform a simple comparison operation, and the complexity and storage overhead are low. Please refer to Figure 3 , the specific implementation of the matching game algorithm in the embodiment is as follows: (1) define the frequency point set as M = {1, 2, …, M}, and the subnetwork set as N = {1, 2, …, N}. M N

[0048] Each subnetwork detects the channel information of each frequency point, including the signal-to-interference-and-noise ratio, and generates a preference for each frequency point as a gain index (that is, an array of 1 x 1 is maintained, and the preference for the node is arranged from high to low). M Meanwhile, each subnetwork calculates the gain index of the subnetwork at each frequency point according to a same rule and stores it in the gain index vector e n (that is, an array of 1 x 2 is maintained, and the preference for the node is arranged from high to low in the first column, and the current state of each subnetwork is matched / unmatched in the second column). In addition, an array of 1 x 2 is maintained N M f n , f n [ i ], i =1, 2, …, N. M ​​​​, store the subnets matched with each frequency in the current round and the gain index of the subnets to the frequency.

[0049] (2) In each round, each subnet center node selects the un-rejected frequency from high to low in the preference list in the control frame (the control frame time slot is determined in advance by other means, such as the network entry procedure) occupied by the subnet, and broadcasts the request matching information of the frequency, including the subnet number, the frequency requested to be matched, and the gain index of the subnet to the frequency.

[0050] (3) In each round, each node judges whether the current request matching is rejected by comparing the subnets matched with each frequency in the current round and the gain index of the subnets to the frequency stored in the array, and the gain index information in the currently broadcast request matching information, and updates the array according to the request matching result.

[0051] (4) Repeat (2) to (3) for the un-matched subnets until each subnet is matched with at least one frequency.

[0052] (5) Each subnet performs frequency switching according to the frequency matching result.

[0053] Therefore, in the wireless communication network considered in the embodiment, each subnet occupies different frequency resources. Within the subnet, one center node and multiple service nodes share the same frequency resources and access through time division multiplexing. In order to adapt to the complex electromagnetic environment that may exist in actual deployment conditions, each node of the wireless communication network has cognitive radio spectrum sensing capability, the spectrum sensing result of the service node of the subnet is reported to the center node, and the center node uniformly makes frequency decision, including selecting a suitable frequency for access and switching to an idle frequency point when interfered. Through efficient coordination communication mode between different subnets, the same frequency interference caused by different subnets occupying the same frequency resource is avoided, and the communication overhead of coordination between different subnets is minimized.

[0054] Please refer to Figure 2 Embodiment two of the present application is: A frequency point coordination system 1 of a communication network, comprising a memory 2, a processor 3, and a computer program stored in the memory 2 and executable on the processor 3, wherein the processor 3 implements each step of the frequency point coordination method of the communication network of embodiment one when executing the computer program.

[0055] In summary, the application provides a frequency point coordination method and system for a communication network. Each subnet in the communication network establishes a frequency point preference list according to the gain index of each frequency point. Each subnet can generate request matching information for the preferred frequency point according to the frequency point preference list. Each subnet broadcasts the request matching information to the remaining subnets. When a subnet receives the broadcast information sent by other subnets, the predicted gain index of the preferred frequency point in the request matching information is simulated, and whether to keep the preferred frequency point in the frequency point preference list is determined according to the predicted gain index. Finally, the frequency point is matched in the subnet corresponding to the received request matching information. In this way, a stable subnet matching result can be converged within a limited step, so that different subnets can obtain relatively ideal frequency point resources. Moreover, each subnet only needs to receive the request matching information broadcast by other subnets and make a virtual decision locally, so that the communication overhead required for frequency point coordination can be reduced.

[0056] The above description is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent transformation or direct or indirect application in the related technical field based on the content of the specification and drawings is also included in the patent protection scope of the application.

Claims

1. A frequency coordination method for a communication network, characterized in that: Including steps: Establish a frequency preference list for each subnet in the communication network according to the gain index of each subnet to the frequency points in the frequency set; Each subnet generates request matching information of a preferred frequency according to the frequency preference list, wherein the request matching information includes a gain index of the subnet for the preferred frequency; Each subnet broadcasts the request matching information to other subnets; when each subnet receives the request matching information, it calculates a predicted gain index for the preferred frequency in the request matching information, and determines whether to retain the preferred frequency in the frequency preference list based on the predicted gain index; The subnet is matched by the frequency point in the subnet corresponding to the received request matching information.

2. The frequency coordination method of a communication network according to claim 1, characterized in that: A frequency preference list for each subnet in the communication network is established based on its gain index for the frequency points in the frequency set, which previously included: A service node of a subnet in the communication network performs spectrum sensing on a frequency point in the frequency point set to obtain a first sensing result; The central node of the subnet performs spectrum sensing on the frequency point to obtain a second sensing result; The gain index of the central node of the subnet for the frequency point is calculated by combining the first perception result, the second perception result, the currently matched frequency point data, and the currently idle frequency point data.

3. The frequency coordination method of a communication network according to claim 1, characterized in that: A frequency preference list for each subnet in the communication network is established based on the gain index of each subnet to the frequency points in the frequency set, including: For each subnet in the communication network, the gain index of the subnet for each frequency point in the frequency point set is sorted in descending order to generate a frequency point preference list of the subnet.

4. The frequency coordination method of a communication network according to claim 3, characterized in that: Each subnet generates request matching information for a preferred frequency based on the frequency preference list, including: For each subnet in the communication network, the subnet selects a frequency with the highest gain index that has not been rejected from the frequency preference list as a preferred frequency, and generates request matching information for the preferred frequency.

5. The frequency coordination method of a communication network according to claim 1, characterized in that: Each subnet broadcasts the request matching information to other subnets, further comprising: Each subnet broadcasts the request matching information of the adjacent subnet to the other subnets.

6. The frequency coordination method of a communication network according to claim 1, characterized in that: Determining whether to retain the preferred frequency point in the frequency point preference list according to the predicted gain index includes: In the subnet, when the predicted gain index is greater than the gain index in the request matching information, retaining the preferred frequency in the frequency preference list of the subnet; Otherwise, the preferred frequency is deleted from the frequency preference list of the subnet.

7. The frequency coordination method of a communication network according to claim 1, characterized in that: Matching a subnet in the subnet corresponding to the received request matching information by the frequency point includes: If the frequency point is in an unmatched state, the subnet with the largest gain index is selected from the received matching request information for matching, and the subnets corresponding to the remaining matching request information are rejected.

8. The frequency coordination method of a communication network according to claim 1, characterized in that: Matching a subnet in the subnet corresponding to the received request matching information by the frequency point includes: If the frequency point is in a matched state, determine whether the gain index of the matched subnet of the frequency point is greater than the gain index in each received request matching information. If not, reject the matched subnet and select the subnet with the largest gain index in the received request matching information for matching.

9. The frequency coordination method of a communication network according to claim 1, characterized in that: The frequency point matches the subnet in the subnet corresponding to the received request matching information, and then includes: If there is a subnet that does not match the frequency, the subnet that does not match the frequency is returned to the step of broadcasting the request matching information to other subnets until all subnets match the frequency.

10. A frequency coordination system for a communication network, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, each step of the frequency coordination method for a communication network as described in any one of claims 1 to 9 is implemented.

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