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.

Description

This application (e.g., first TDD subframe configuration signal) for the transmission of backhaul signals. The configuration signal can include information about a domain assigned to transmit the backhaul signals. The configuration signal can include information about, for example, the position, the number, etc. of subframes which are assigned to transmit the backhaul signals.

The information included in the configuration signal (e.g., the first TDD subframe configuration signal) can be configured semi-persistently or dynamically. For example, if subframes assigned to transmit the backhaul signals are semi-persistently configured, the BS or the RS can transmit the backhaul signals in the subframes which have been semi-persistently configured within a predetermined period of time or until a new configuration signal (e.g., second TDD subframe configuration signal) is exchanged. If subframes assigned to transmit the backhaul signals are dynamically configured, the BS or the RS can exchange a configuration signal (e.g., second TDD subframe configuration signal) whenever the backhaul signal is transmitted. A The first TDD subframe configuration signal for transmitting backhaul signals in one of DL subframes and UL subframes can be semi-persistently configured, and a the second TDD subframe configuration signal for transmitting backhaul signals in the other of the DL subframes and the UL subframes can be dynamically configured. The second TDD subframe configuration signal dynamically configured can be transmitted in the subframes semi-persistently configured by the first TDD subframe configuration signal.

FIG. 16 is a block diagram of a BS or an RS according to an embodiment of the present invention.

Referring to FIG. 16, the BS or the RS 100 includes a processor 110 and a Radio Frequency (RF) unit 120. The RF unit 120 transmits and receives a radio signal. The processor 110 is coupled to the RF unit 120. The processor 110 is configured to perform scheduling for the transmission of backhaul signals and to transmit the backhaul signal to the RS or the BS using both resources for downlink transmission and resources for uplink transmission based on the scheduling.

In view of the exemplary systems described herein, methodologies that may be implemented in accordance with the disclosed subject matter have been described with reference to several flow diagrams. While for purposed of simplicity, the methodologies are shown and described as a series of steps or blocks, it is to be understood and appreciated that the claimed subject matter is not limited by the order of the steps or blocks, as some steps may occur in different orders or concurrently with other steps from what is depicted and described herein. Moreover, one skilled in the art would understand that the steps illustrated in the flow diagram are not exclusive and other steps may be included or one or more of the steps in the example flow diagram may be deleted without affecting the scope and spirit of the present disclosure.

What has been described above includes examples of the various aspects. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the various aspects, but one of ordinary skill in the art may recognize that many further combinations and permutations are possible. Accordingly, the subject specification is intended to embrace all such alternations, modifications and variations that fall within the spirit and scope of the appended claims.

Claims

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.