METHOD FOR OPTIMIZING SPATIAL DIVERSITY GAIN OF A SET OF NODES USED FOR COOPERATIVE SENSING
First Claim
1. A method for optimizing spatial diversity of a set of nodes for cooperative spectrum sensing, comprising:
- selecting an initial set of nodes from a plurality of nodes, the initial set of nodes selected substantially at random from the plurality of nodes;
obtaining sensing results from each node of the initial set of nodes, the sensing results produced by the nodes in response to performing a cooperative sensing regime;
determining an initial cooperative sensing index of the initial set of nodes based on the sensing results, the initial cooperative sensing index indicating a level of spatial diversity of the initial set of nodes, wherein the initial cooperative sensing index satisfies a minimum spatial diversity criteria;
selecting at least one additional node from a remaining set of nodes, the remaining set of nodes consisting of nodes in the plurality of nodes not in the initial set of nodes, wherein the at least one additional node is selected substantially at random from the remaining nodes; and
replacing at least one node in the initial set of nodes with the at least one additional node to produce an optimized set of nodes, the optimized set of nodes having an increased cooperative sensing index that is higher than the initial cooperative sensing index.
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Abstract
A group of nodes used for sensing in a cooperative sensing communication system (100) are selected from nodes (104-112) associated with a base station (102) operating in secondary communication mode. The group has a spatial diversity gain, as determined by a cooperative sensing index (306) that initially meets a minimum threshold. To optimize the spatial diversity gain, nodes not in the initial set are individually added to the set (408), and the index is recomputed (608). The additional node having the highest effect on spatial diversity is added to the group (614). To maintain group size, each of the original nodes is individually removed from the group (706) and the index is recomputed (708) with each initial node removed to determine which of the initial nodes provided the smallest spatial gain contribution, and is removed from the group (714).
66 Citations
19 Claims
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1. A method for optimizing spatial diversity of a set of nodes for cooperative spectrum sensing, comprising:
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selecting an initial set of nodes from a plurality of nodes, the initial set of nodes selected substantially at random from the plurality of nodes; obtaining sensing results from each node of the initial set of nodes, the sensing results produced by the nodes in response to performing a cooperative sensing regime; determining an initial cooperative sensing index of the initial set of nodes based on the sensing results, the initial cooperative sensing index indicating a level of spatial diversity of the initial set of nodes, wherein the initial cooperative sensing index satisfies a minimum spatial diversity criteria; selecting at least one additional node from a remaining set of nodes, the remaining set of nodes consisting of nodes in the plurality of nodes not in the initial set of nodes, wherein the at least one additional node is selected substantially at random from the remaining nodes; and replacing at least one node in the initial set of nodes with the at least one additional node to produce an optimized set of nodes, the optimized set of nodes having an increased cooperative sensing index that is higher than the initial cooperative sensing index. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for optimizing a sensing set of nodes for use in cooperative sensing secondary channel availability, comprising:
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selecting an initial set of nodes from a plurality of nodes associated with a base station to form a sensing set of nodes, the initial set of nodes having a cooperative sensing index that at least meets a minimum cooperative sensing index criteria; selecting an additional set of nodes, the additional set of nodes consisting of at least one node from the plurality of nodes not in the initial set of nodes; determining a cooperative sensing index delta for each one of the additional nodes when each of the additional nodes is individually added to the sensing set of nodes and identifying a leader node among the additional nodes which yields a highest cooperative sensing index delta when added to the sensing set; adding the leader node to the sensing set of nodes; determining a cooperative sensing index delta for each node of the initial set of nodes when individually removed from the sensing set of nodes with the leader node added to the sensing set and identifying which node of the initial set of nodes yields a lowest cooperative sensing index delta when removed from the sensing set; and removing the node of the initial set of nodes which yields the lowest cooperative sensing index delta from the sensing set; wherein the cooperative sensing index is based on radio sensing results provided by each node of the sensing set, and wherein the sending results are obtained by each node in the sensing set by performing a sensing regime provided by the base station to each node in the sensing set. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A secondary communication system, comprising:
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a plurality of nodes; a base station configured to provide a radio interface to each of the plurality of nodes, and further configured to define a set of sensing nodes from the plurality of nodes by receiving sensing results of performing a sensing regime from an initial set of nodes having an initial cooperative sensing index, and replacing nodes in the initial set of nodes with other nodes from the plurality of nodes which increase the cooperative sensing index of the set over nodes of the initial set which are removed from the initial set to achieve a desired cooperative sensing index which is higher than the initial cooperative sensing index. - View Dependent Claims (17, 18, 19)
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Specification