Method, apparatus and computer program for relay selection
First Claim
Patent Images
1. A method comprising:
- determining a plurality of relays that are available between at least one source and at least one destination;
selecting a subset of the plurality of relays for an activation interval comprising a predetermined time interval, under a constraint that comprises relay transmit energy per activation interval, wherein the relay transmit energy during an activation interval remains the same throughout the activation interval, and wherein each relay selected for the subset is selected based at least in part on the relay'"'"'s available power designated for relaying, and wherein the subset comprises more than one relay of the plurality of relays; and
causing at least one of the relays of the subset to relay between the at least one source and the at least one destination during the activation interval.
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Abstract
First are determined which relays are available between at least one source and at least one destination, and from them are selected a subset of those relays for an activation interval under a constraint of equal transmit energy per selected relay across the activation interval. A matrix is formed, using CSI received from the relays, to evaluate each effective channel between source and destination that goes through each of the relays, including multi-relay hops, and the relays are selected from that matrix. Utility of source-relay pairing is evaluated in view of the relay-destination channel and the pairing enables relays to multiplex multiple sources where feasible.
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Citations
33 Claims
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1. A method comprising:
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determining a plurality of relays that are available between at least one source and at least one destination; selecting a subset of the plurality of relays for an activation interval comprising a predetermined time interval, under a constraint that comprises relay transmit energy per activation interval, wherein the relay transmit energy during an activation interval remains the same throughout the activation interval, and wherein each relay selected for the subset is selected based at least in part on the relay'"'"'s available power designated for relaying, and wherein the subset comprises more than one relay of the plurality of relays; and causing at least one of the relays of the subset to relay between the at least one source and the at least one destination during the activation interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device comprising:
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a processor configured to determine from received transmissions a plurality of relays that are available between at least one source and at least one destination; the processor further configured to select a subset of the plurality of relays for an activation interval comprising a predetermined time interval, under a constraint that comprises relay transmit energy per activation interval, wherein the relay transmit energy during an activation interval remains the same throughout the activation interval and wherein each relay selected for the subset is selected based at least in part on the relay'"'"'s available power designated for relaying, and wherein the subset comprises more than one of the plurality of relays; and a transmitter configured to cause at least one of the relays of the subset to relay between the at least one source and the at least one destination during the activation interval. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A non-transitory computer readable memory embodying a program of instructions for causing a processor to take actions directed toward selecting relays, the actions comprising:
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determining a plurality of relays that are available between at least one source and at least one destination; selecting a subset of the plurality of relays for an activation interval comprising a predetermined time interval, wherein the subset comprises more than one of the plurality of relays, under a constraint that comprises relay transmit energy per activation interval, wherein the relay transmit energy during an activation interval remains the same throughout the activation interval and wherein each relay selected for the subset is selected based at least in part on the relay'"'"'s available power designated for relaying; and causing at least one of the relays of the subset to relay between the at least one source and the at least one destination during the activation interval. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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Specification