Method and apparatus for cooperative wireless communications
A method and apparatus for wireless communications is disclosed. Channel state information (CSI) for a plurality of network nodes is transmitted. Grant information is received from at least one network node of the plurality of network nodes. The grant information is based on the transmitted CSI and includes an indication of a cooperative scheme. A plurality of beam-formed signals, including data from each of the plurality of network nodes, is received in response to the received grant information. The same data is received from each of the plurality of network nodes.
1. A wireless transmit/receive unit (WTRU) comprising:
a transmitter configured to transmit channel state information (CSI) for a plurality of network nodes;
a receiver configured to receive grant information from at least one network node of the plurality of network nodes, wherein the grant information is based on the transmitted CSI and includes an indication of a cooperative scheme; and
wherein the receiver is further configured to receive a plurality of signals including data from each of the plurality of network nodes in response to the received grant information, and wherein the same data is received from each of the plurality of network nodes.
2. The WTRU of claim 1 , wherein the CSI includes beam-forming information.
3. The WTRU of claim 2 , wherein the beam-forming information includes beam-forming weights.
4. The WTRU of claim 1 , wherein at least one of the plurality of network nodes is a base station or a relay node.
5. The WTRU of claim 1 , wherein the plurality of signals are long term evolution (LTE) orthogonal frequency division multiplex (OFDM) signals.
6. The WTRU of claim 1 , wherein the cooperative scheme indicates a combination of the plurality of network nodes that the plurality of signals originate from.
7. The WTRU of claim 1 , wherein the plurality of signals are beam-formed signals, distributed beam-formed signals, or weighted beam-formed signals.
8. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:
transmitting channel state information (CSI) for a plurality of network nodes;
receiving grant information from at least one network node of the plurality of network nodes, wherein the grant information is based on the transmitted CSI and includes an indication of a cooperative scheme; and
receiving a plurality of signals including data from each of the plurality of network nodes in response to the received grant information, wherein the same data is received from each of the plurality of network nodes.
9. The method of claim 8 , wherein the CSI includes beam-forming information.
10. The method of claim 9 , wherein the beam-forming information includes beam-forming weights.
11. The method of claim 8 , wherein at least one of the plurality of network nodes is a base station or a relay node.
12. The method of claim 8 , wherein the plurality of signals are long term evolution (LTE) orthogonal frequency division multiplex (OFDM) signals.
13. The method of claim 8 , wherein the cooperative scheme indicates a combination of the plurality of network nodes that the plurality of signals originate from.
14. The method of claim 8 , wherein the plurality of signals are beam-formed signals, distributed beam-formed signals, or weighted beam-formed signals.
15. A first network node comprising:
a receiver configured to receive channel state information (CSI) for a plurality of network nodes from a wireless transmit/receive unit (WTRU); and
a transmitter configured to transmit grant information to the WTRU, wherein the grant information is based on the transmitted CSI and includes an indication of a cooperative scheme; and
wherein the transmitter is further configured to transmit a first signal that includes data to the WTRU substantially simultaneously with a second signal from another network node, based on the transmitted grant information, wherein the same data is transmitted in the first and second signals.
16. The first network node of claim 15 , wherein the CSI includes beam-forming information and wherein the beam-forming information includes beam-forming weights.
17. The first network node of claim 15 , wherein the first network node is a base station or a relay node.
18. The first network node of claim 15 , wherein the first signal is a long term evolution (LTE) orthogonal frequency division multiplex (OFDM) signal.
19. The first network node of claim 15 , wherein the cooperative scheme indicates a combination of at least the first network node and the another network node that the signals originate from.
20. The first network node of claim 15 , wherein the first signal and the second signal from the another network node are beam-formed signals, distributed beam-formed signals, or weighted beam-formed signals.