Interference alignment method and apparatus in wireless communication system
An interference alignment method and apparatus in a wireless communication system are provided. A method of a serving Base Station (BS) for uplink interference alignment in a wireless communication system includes estimating a channel for at least one served Mobile Station (MS), estimating an interference channel for at least one neighboring MS, exchanging information about an interference channel with at least one neighboring BS, determining a precoding vector of each of the at least one served MS for configuring interference from all of the at least one neighboring MS as one spatial dimension, and transmitting the determined precoding vector to each of the at least one served MSs.
1. A method of a base station (BS) serving a terminal in a wireless communication system, the method comprising:
receiving, from each of at least one neighboring BS, each predetermined vector for each of the at least one neighboring BS and channel state information for each channel between the terminal and each of the at least one neighboring BS;
determining a precoding vector based on the channel state information for the each channel and the each predetermined vector;
transmitting, to the terminal, the precoding vector; and
receiving, from the terminal, data precoded by the precoding vector,
wherein the each predetermined vector is to determine a spatial dimension for an interference, caused by the data, to each of the at least one neighboring BS.
2. The method of claim 1 , further comprising:
estimating a channel between the terminal and the BS; and
transmitting channel state information for the channel and a predetermined vector of the BS to each of the at least one neighboring BS.
3. The method of claim 1 , wherein the precoding vector configures each interference vector from the terminal to each of the at least one neighboring BS to have a same spatial dimension as each of the predetermined vectors.
4. The method of claim 1 , further comprising forming a reception beam for the terminal by using the precoding vector.
5. The method of claim 1 , wherein the terminal comprises a first plurality of antennas and the BS comprises a second plurality of antennas, the method further comprising:
performing a signal transmission or a signal reception by using a fewer number of antennas among the second plurality of antennas than a threshold number of antennas,
wherein the threshold number of antennas is determined based on the number of the first plurality of antennas.
6. The method of claim 1 , wherein a number of each of the at least one neighboring BS is two or more.
7. The method of claim 5 , wherein the threshold number of antennas is determined based further on a number of the BS and the at least one neighboring BS.
8. The method of claim 7 , wherein the threshold number is the number of the first plurality of antennas divided by one fewer number of the BS and each of the at least one neighboring BS.
9. The method of claim 1 , wherein the terminal is within a coverage of the BS and out of a coverage of each of the at least one BS.
10. An apparatus of a base station (BS) serving a terminal in a wireless communication system, the apparatus comprising:
a transceiver configured to receive, from each of at least one neighboring BS, each predetermined vector for each of the at least one neighboring BS and channel state information for each channel between the terminal and each of the at least one neighboring BS; and
a controller configured to determine a precoding vector based on the channel state information for the each channel and the each predetermined vector,
wherein the transceiver is further configured to:
transmit, to the terminal, the precoding vector, and
receive, from the terminal, data precoded by the precoding vector, and
wherein the each predetermined vector is to determine a spatial dimension for an interference, caused by the data, to each of the at least one neighboring BS.
11. The apparatus of claim 10 ,
wherein the controller is further configured to estimate a channel between the terminal and the BS, and
wherein the transceiver is further configured to transmit channel state information for the channel and a predetermined vector of the BS to each of the at least one neighboring BS.
12. The apparatus of claim 10 , wherein the precoding vector configures each interference vector from the terminal to each of the at least one neighboring BS to have a same spatial dimension as each of the predetermined vectors.
13. The apparatus of claim 10 ,
wherein the terminal comprises a first plurality of antennas and the BS comprises a second plurality of antennas,
wherein the controller is further configured to perform a signal transmission or a signal reception by using a fewer number of antennas among the second plurality of antennas than a threshold number of antennas, and
wherein the threshold number of antennas is determined based on the number of the first plurality of antennas.
14. The apparatus of claim 10 ,
wherein the controller is further configured to form a reception beam for the terminal by using the precoding vector.
15. The apparatus of claim 10 , wherein a number of each of the at least one neighboring BS is two or more.
16. The apparatus of claim 13 , wherein the threshold number of antennas is determined based further on a number of the BS and each of the at least one neighboring BS.
17. The apparatus of claim 16 , wherein the threshold number is the number of the first plurality of antennas divided by one fewer number of the BS and each of the at least one neighboring BS.
18. The apparatus of claim 10 , wherein the terminal is within a coverage of the BS and out of a coverage of each of the at least one BS.