Cooperative relay system enabling simultaneous broadcast-unicast operation with efficient automatic repeat request functionality
First Claim
1. A method, comprising:
- receiving feedback signaling from a destination, where the feedback signaling comprises data describing subchannels between each of a plurality of wireless nodes to the destination;
transmitting, using a first unicast transmission on a first subchannel, a first portion of data from a first wireless node of the plurality of wireless nodes to the destination; and
transmitting simultaneously with the first unicast transmission, using a second unicast transmission on a second subchannel, a second portion of the data from a second wireless node of the plurality of wireless nodes to the destination,where at least one of the first wireless node and the second wireless node are operated in accordance to the feedback signaling from the destination such that at least the first unicast transmission and the second unicast transmission add constructively at the destination.
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Accused Products
Abstract
A wireless node, such as a relay node, has different operating modes for unicast and broadcast/multicast subchannels. For unicast services the phase offsets of those relay nodes engaged in a cooperative transmission are optimized for the subchannels used for unicast services. Alternatively, when no feedback is available and an open loop MIMO or MIMO-type scheme is in use, retransmissions are performed in such a way that a destination (e.g., user terminal) receives effectively a distributed space-time block code. For the broadcast/multicast services time varying random phase offsets may be employed for the subchannels used for broadcast services. For reliable high data rate broadcast transmissions a cooperative retransmission scheme that effectively forms distributed space-time block codes may be used.
19 Citations
23 Claims
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1. A method, comprising:
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receiving feedback signaling from a destination, where the feedback signaling comprises data describing subchannels between each of a plurality of wireless nodes to the destination; transmitting, using a first unicast transmission on a first subchannel, a first portion of data from a first wireless node of the plurality of wireless nodes to the destination; and transmitting simultaneously with the first unicast transmission, using a second unicast transmission on a second subchannel, a second portion of the data from a second wireless node of the plurality of wireless nodes to the destination, where at least one of the first wireless node and the second wireless node are operated in accordance to the feedback signaling from the destination such that at least the first unicast transmission and the second unicast transmission add constructively at the destination. - View Dependent Claims (2, 3)
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4. A method, comprising:
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transmitting, using a first unicast transmission on a first subchannel, a first portion of data from a first wireless node of a plurality of wireless nodes to a destination and transmitting simultaneously with the first unicast transmission, using a second unicast transmission on a second subchannel, a second portion of the data from a second wireless node of the plurality of wireless nodes to the destination receiving a request for retransmission, where the request is received from the destination and received by at least one of the plurality of wireless nodes, in response to receiving the request, generating a third portion of the data such that the third portion comprises different transmission symbols than the first portion; generating a fourth portion of the data such that the fourth portion comprises different transmission symbols than the second portion; transmitting, using a third unicast transmission on the first subchannel, the third portion of the data from the first wireless node to the destination; and transmitting simultaneously with the third unicast transmission, using a fourth unicast transmission on the second subchannel, the fourth portion of the data from the second wireless node to the destination, where the third unicast transmission and the fourth unicast transmission results in the destination receiving a distributed space-time block code and the destination comprises one of a user terminal device or a relay node. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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operating a plurality of wireless nodes to cooperatively transmit at least one of broadcast and multicast data through first subchannels, and to simultaneously also cooperatively transmit unicast data through at least one second subchannel, from a source to a plurality of destinations; and while cooperatively transmitting the at least one of broadcast and multicast data and the unicast data, controlling transmission through the first subchannels differently than through the at least one second subchannel, where each of the plurality of wireless nodes uses time varying phase offsets to induce temporal variations in a channel seen at each of the plurality of destinations, where the phase offsets create a temporal variation within a forward error correction code length, while still enabling each destination to estimate and track the channel. - View Dependent Claims (15)
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16. A method, comprising:
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operating a plurality of wireless nodes to cooperatively transmit at least one of broadcast and multicast data from a source to a plurality of destinations; and while cooperatively transmitting the at least one of broadcast and multicast data, responding to a request for retransmission from one of the destinations by at least one of the plurality of wireless nodes changing transmission symbols for the retransmission such that a cooperative retransmission results in the destination receiving a distributed space-time block code, where at least one of the plurality of destinations comprises one of a user terminal device or a relay node. - View Dependent Claims (17, 18, 19)
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20. An apparatus, comprising a wireless receiver, a wireless transmitter, and a transmission control unit configured:
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to cooperatively transmit at least one of broadcast and multicast data through first subchannels to a plurality of destination nodes, and to simultaneously cooperatively transmit unicast data through second subchannels to at least one destination node, where the first subchannels and the second subchannels are controlled differently, where the apparatus uses a time varying phase offset to induce temporal variations in the first subchannel at each of the plurality of destination nodes, where the phase offset creates a temporal variation within a forward error correction code length, while still enabling each destination node to estimate and track the channel. - View Dependent Claims (21, 22, 23)
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Specification