Method and system for wireless communication networks using cooperative relaying
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Abstract
The present invention relates to relay supported wireless communication to enhance communication performance. In the wireless communication system according to the invention neighboring relay stations are arranged with substantially overlapping coverage. In the method according to the invention mobile stations makes soft association to relay stations. The mobile stations feed back the selection of relay stations and channel quality measures to the base station. The base station adapts the transmission to the relay stations based on each mobile stations reported soft associations and channel quality measures. In this way the control signaling to and from the relay stations can be very limited.
221 Citations
56 Claims
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1-28. -28. (canceled)
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29. A method of performing communication in a two-hop wireless communication network, wherein a base station, at least one mobile station and a plurality of relay stations are engaged in, or in the process of establishing, a communication session, and wherein the relay stations forward signals from the based station to the at least one mobile station, said plurality of relay stations having at least partially overlapping coverage, said method comprising the steps of:
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establishing by said at least one mobile station a soft association to said plurality of relay stations by internally selecting a set of relay channels from said number of relay stations, said set of relay channels associated to the relay stations being candidates for use in the communication session;
feeding back from the at least one mobile station, during the communication session, information on the communication quality to the base station; and
,adapting in the base station the transmission to at least one of the relay stations which the mobile station has soft association with, in response to the communication quality feedback from the at least one mobile station. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A system adapted for communication in a two-hop wireless communication network, wherein the network comprises at least a base station, at least one mobile station and a plurality of relay stations, wherein the relay stations are adapted to forwarding signals from the base station to the mobile station, at least a portion of the plurality of relay stations are organized so that at least two neighbouring relay stations have substantially overlapping coverage, and the channels of the relay stations with overlapping coverage are essentially orthogonal;
- wherein;
at least one mobile station is operative to select a set of relay stations from the relay stations with at least partially overlapping coverage, thereby establishing soft association to a plurality of relay stations which are candidates to use in communication between the base station and the mobile station; and
,logical feedbacks between the mobile stations and the base station, wherein the logical feedbacks carries information usable by the base station to adapt transmit parameters for the transmission to the relay stations. - View Dependent Claims (48, 49, 50)
- wherein;
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51. A receiver adapted for use in a two-hop wireless communication network, wherein the network comprises a transmitter, a receiver and at least one relay station, wherein the relay station is adapted to forward signals from the transmitter to the receiver, said receiver comprising:
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selecting means operative to select a set of relay stations from a plurality of relay stations with substantially overlapping coverage, said selecting means arranged to base the selection on relay channel quality;
feedback means operative to feed back the information on selected relays to the transmitter. - View Dependent Claims (52, 53)
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54. A base station adapted for use in a two-hop wireless communication network, wherein the network comprises a base station, at least one mobile station and at least one relay station, wherein the relay station is adapted to forwarding signals from the base station to the mobile station, the base station comprising:
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means for receiving feedback from the mobile station on the transmission to the mobile station;
optimization means operative to identify conflicting demands from at least two mobile stations regarding the usage of at least one relay station, said two mobile stations having soft association to the same as least one relay station, and operative to perform an optimization process for resolving the conflicting demands;
transmission parameter adapting means operative to determine transmission parameters for the transmission at least to the relay stations to which the two mobile stations have soft association, taking into account the result of the optimization process. - View Dependent Claims (55, 56)
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Specification