Method and apparatus of transmitting backhaul signal in wireless communication system including relay station

Abstract

A method and apparatus of transmitting backhaul signals performed by a relay station in a wireless communication system is provided. A relay station performs scheduling with a base station in order to transmit the backhaul signals, and transmitting the backhaul signals to the base station using both resources for downlink transmission and resources for uplink transmission based on the scheduling.

The invention claimed is: 
     
       1. A method of transmitting backhaul signals performed by a relay station in a wireless communication system, the method comprising:
 receiving, from a base station, scheduling information about resources assigned to transmit backhaul signals; and   transmitting the backhaul signals to the base station using both resources for downlink transmission and resources for uplink transmission simultaneously based on the scheduling information.   
     
     
       2. The method of  claim 1 , wherein the resources for downlink transmission comprise a first frequency band, and the resources for uplink transmission comprise a second frequency band. 
     
     
       3. The method of  claim 2 , wherein the backhaul signals are simultaneously transmitted in the first frequency band and the second frequency band. 
     
     
       4. The method of  claim 2 , wherein the backhaul signals respectively transmitted in the first frequency band and the second frequency band are subjected to a single channel coding process thereby resulting in one codeword. 
     
     
       5. The method of  claim 1 , wherein the scheduling information about the resources assigned to transmit the backhaul signals is semi-persistently indicated using a bitmap. 
     
     
       6. The method of  claim 1 , wherein some of the scheduling information about the resources assigned to transmit the backhaul signals is semi-persistently indicated, and a remainder of the scheduling information about the resources assigned to transmit the backhaul signals is dynamically indicated. 
     
     
       7. The method of  claim 6 , wherein the scheduling information about the dynamically indicated resources is transmitted using the semi-persistently indicated resources. 
     
     
       8. The method of  claim 1 , wherein the resources for downlink transmission comprise a first time domain, and the resources for uplink transmission comprise a second time domain. 
     
     
       9. A method of transmitting backhaul signals performed by a base station in a wireless communication system, the method comprising:
 performing scheduling in order to transmit the backhaul signals; and   transmitting the backhaul signals to at least one relay station using both resources for downlink transmission and resources for uplink transmission simultaneously based on the scheduling.   
     
     
       10. The method of  claim 9 , wherein the resources for downlink transmission comprise a first frequency band, the resources for uplink transmission comprise a second frequency band, and the backhaul signals are simultaneously transmitted in the first frequency band and the second frequency band. 
     
     
       11. The method of  claim 9 , wherein performing the scheduling comprises exchanging scheduling information about resources assigned to transmit the backhaul signals with the relay station. 
     
     
       12. The method of  claim 10 , wherein the base station transmits a first backhaul signal to a first relay station in the first frequency band and transmits a second backhaul signal to a second relay station in the second frequency band. 
     
     
       13. The method of  claim 9 , further comprising receiving a request to limit resources from the at least one relay station based on communication conditions, wherein the request is used to limit frequency bands or subframes assigned in order to transmit the backhaul signals. 
     
     
       14. A relay station in a wireless communication system, the relay station comprising:
 a Radio Frequency (RF) unit configured to transmit and receive a radio signal; and   a processor coupled to the RF unit and configured to receive from a base station, scheduling information about resources assigned to transmit backhaul signals and to transmit the backhaul signals to the base station using both resources for downlink transmission and resources for uplink transmission simultaneously based on the scheduling information.   
     
     
       15. A base station in a wireless communication system, the base station comprising:
 a Radio Frequency (RF) unit configured to transmit and receive a radio signal; and   a processor coupled to the RF unit and configured to perform scheduling in order to transmit backhaul signals and to transmit the backhaul signals to at least one relay station using both resources for downlink transmission and resources for uplink transmission simultaneously based on the scheduling.   
     
     
       16. A method of receiving signals, the method performed by a wireless station and comprising:
 receiving, from a base station, a first Time Division Duplex (TDD) subframe configuration which indicates locations of at least one downlink subframe and at least one uplink subframe, wherein the first TDD subframe configuration is received at a predetermined period;   receiving, from the base station, a second TDD subframe configuration which indicates new locations of at least one downlink subframe and at least one uplink subframe, wherein the second TDD subframe configuration is expressed as a bitmap; and   after applying the second TDD subframe configuration, receiving, from the base station, the signals on a subframe,   wherein when the second TDD subframe configuration is applied, the subframe is changed from an uplink subframe indicated by the first TDD subframe configuration to a downlink subframe, and   wherein the subframe is configured in Multicast Broadcast Single Frequency Network (MBSFN) subframes.   
     
     
       17. The method of claim 16, wherein the first TDD subframe configuration semi-persistently indicates the locations of at least one downlink subframe and at least one uplink subframe, until the second TDD subframe configuration is received. 
     
     
       18. The method of claim 16, wherein the second TDD subframe configuration dynamically indicates the new locations of at least one downlink subframe and at least one uplink subframe. 
     
     
       19. A wireless station, comprising:
 a transceiver; and   a processor coupled to the transceiver and configured to:
 receive, from a base station, a first Time Division Duplex (TDD) subframe configuration which indicates locations of at least one downlink subframe and at least one uplink subframe, wherein the first TDD subframe configuration is received at a predetermined period, 
 receive, from the base station, a second TDD subframe configuration which indicates locations of at least one downlink subframe and at least one uplink subframe, wherein the second TDD subframe configuration is expressed as a bitmap, and 
 after applying the second TDD subframe configuration, receive, from the base station, signals on a subframe, 
   wherein when the second TDD subframe configuration is applied, the subframe is changed from an uplink subframe indicated by the first TDD subframe configuration to a downlink subframe, and   wherein the subframe is configured in Multicast Broadcast Single Frequency Network (MBSFN) subframes.   
     
     
       20. The wireless station of claim 19, wherein the first TDD subframe configuration semi-persistently indicates the locations of at least one downlink subframe and at least one uplink subframe, until the second TDD subframe configuration is received. 
     
     
       21. The wireless station of claim 19, wherein the second TDD subframe configuration dynamically indicates the new locations of at least one downlink subframe and at least one uplink subframe.