METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL IN RELAY STATION

• US 20110070821A1
• Filed: 09/21/2010
• Published: 03/24/2011
• Est. Priority Date: 09/21/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Cho, Han Gyu, Lim, Dong Guk, Kwak, Jin Sam, Chun, Jin Young
• Granted Patent: US 8,547,895 B2
• Time in Patent Office: Days
• US Class Current: 455/7
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

A method of a Relay Station (RS) transmitting and receiving a signal in a wireless communication system including the RS, comprising receiving frame configuration information about an RS frame from a Base Station (BS), configuring a downlink (DL) access zone in which a signal is transmitted to a relay Mobile Station (MS) connected to the RS and a DL relay zone in which a signal is received from the BS in the RS frame on the basis of the frame configuration information, comparing a time necessary to switch an operation from the DL access zone to the DL relay zone and a propagation delay time taken to receive the signal from the BS, configuring some symbols of the DL access zone or the DL relay zone as a transition time according to a result of the comparison, transmitting the signal to the relay MS in the DL access zone, and receiving the signal from the BS in the DL relay zone.

Claims

1. A method of a Relay Station (RS) transmitting and receiving a signal in a wireless communication system including the RS, the method comprising:

receiving frame configuration information about an RS frame from a Base Station (BS);

configuring a downlink (DL) access zone in which a signal is transmitted to a relay Mobile Station (MS) connected to the RS and a DL relay zone in which a signal is received from the BS in the RS frame on the basis of the frame configuration information;

comparing a time necessary to switch an operation from the DL access zone to the DL relay zone and a propagation delay time taken to receive the signal from the BS;

configuring some symbols of the DL access zone or the DL relay zone as a transition time according to a result of the comparison;

transmitting the signal to the relay MS in the DL access zone; and

receiving the signal from the BS in the DL relay zone.

2. The method of claim 1, wherein the transition time is configured in a last symbol of the DL access zone or a first symbol of the DL relay zone.

3. The method of claim 1, wherein in case where the time necessary to switch the operation is indicated by an RSTTG, the propagation delay time is indicated by R_RTD/2, and the transition time is indicated by an R-TTI, the transition time is calculated using an equation below.

4. The method of claim 1, further comprising:

in case where the RS frame is a Frequency Division Duplex (FDD) frame, comparing a time necessary to switch an operation from the DL relay zone to a DL access zone of a next frame, the propagation delay time taken to receive the signal from the BS, and an idle time of a BS frame; and

configuring the transition time in a last symbol of the DL relay zone and in the idle time according to a result of the comparison.

5. The method of claim 4, wherein the transition time configured in the last symbol of the DL relay zone and in the idle time is calculated using an equation below.

6. A method of an RS transmitting and receiving a signal in a wireless communication system including the RS, the method comprising:

receiving frame configuration information about an RS frame from a BS;

configuring an uplink (UL) access zone in which a signal is received from a relay MS connected to the RS and an UL relay zone in which a signal is transmitted to the BS in the RS frame on the basis of the frame configuration information;

receiving the signal from the relay MS in the UL access zone; and

transmitting the signal to the BS in the UL relay zone,

wherein the UL access zone is time-aligned with an UL access zone of a BS frame and then transmitted or transmitted before the UL access zone of the BS frame by a specific time interval.

7. The method of claim 6, wherein in case where the RS frame is a FDD frame, assuming that a time necessary to switch an operation from the UL access zone to the UL relay zone is an RSRTG and a time necessary to switch an operation from the UL relay zone to an UL access zone of a frame subsequent to the RS frame is an RSTTG, if a sum of the RSRTG and the RSTTG is smaller than an idle time of the BS frame, the specific time interval is the RSRTG.

8. The method of claim 7, further comprising:

comparing the sum of the RSTTG and the RSRTG and the idle time of the BS frame; and

configuring some symbols of the UL access zone or the UL relay zone as a transition time according to a result of the comparison.

9. The method of claim 8, wherein in case where the idle time of the BS frame is IdleTime, a transition time configured when the operation is switched from the UL access zone to the UL relay zone is a Relay Receive to transmit Transition Interval (R-RTI), and a transition time configured when the operation is switched from the UL relay zone to the UL access zone of the frame subsequent to the RS frame is a Relay Transmit to receive Transition Interval (R-TTI), the R-RTI and the R-TTI are calculated using an equation below.

10. The method of claim 6, wherein in case where the UL access zone is time-aligned with the UL access zone of the BS frame and then transmitted, a last symbol of the UL access zone or a first symbol of the UL relay zone is used as an R-RTI.

11. The method of claim 10, wherein assuming that a time necessary to switch an operation from the UL relay zone to an UL access zone of a frame subsequent to the RS frame is an RSTTG, if the RSTTG is greater than a sum of a propagation delay time taken to receive the signal from the BS and an idle time of the BS frame, a last symbol of the relay zone is used as the R-TTI.

12. A method of an RS transmitting and receiving a signal in a wireless communication system including the RS, the method comprising:

receiving frame configuration information about an RS frame from a BS;

configuring a frame, comprising a DL access zone in which a signal is transmitted to a relay MS connected to the RS, a DL relay zone in which a signal is received from the BS, an UL access zone in which a signal is received from the relay MS connected to the RS, and an UL relay zone in which a signal is transmitted to the BS, on the basis of the frame configuration information;

configuring a transition time in the DL access zone or the UL relay zone;

transmitting the signal in the DL access zone or the UL relay zone; and

receiving the signal in the DL relay zone or the UL access zone.

13. The method of claim 12, wherein the RS frame is a TDD frame.

14. The method of claim 13, wherein assuming that a transition time configured in the DL access zone is an R-TTI, the R-TTI is selectively included in a last symbol of the DL access zone and calculated using an equation below.

15. The method of claim 14, wherein in case where the UL access zone is transmitted before an UL access zone of a BS frame by a specific time, assuming that a transition time configured in the UL relay zone is an R-RTI, the R-RTI is calculated using an equation below.

16. An RS, comprising:

a Radio Frequency (RF) unit configured to transmit and receive a radio signal; and

a processor connected to the RF unit,

wherein the processor receives frame configuration information about an RS frame from a BS, configures a DL access zone in which a signal is transmitted to a relay MS connected to the RS and a DL relay zone in which a signal is received from the BS in an RS frame on the basis of the frame configuration information, compares a time necessary to switch an operation from the DL access zone to the DL relay zone and a propagation delay time taken to receive a signal from the BS, configures some symbols of the DL access zone or the DL relay zone as a transition time according to a result of the comparison, and transmits a signal to the relay MS in the DL access zone or receives a signal from the BS in the DL relay zone.

17. An RS, comprising:

an RF unit configured to transmit and receive a radio signal; and

a processor connected to the RF unit,

wherein the processor receives frame configuration information about an RS frame from a BS, configures an UL access zone in which a signal is received from a relay MS connected to the RS and an UL relay zone in which a signal is transmitted to the BS in the RS frame on the basis of the frame configuration information, and receives the signal from the relay MS in the UL access zone and transmits the signal to the BS in the UL relay zone, and

the UL access zone is time-aligned with an UL access zone of a BS frame and then transmitted or transmitted before the UL access zone of the BS frame by a specific time interval.

18. An RS, comprising:

an RF unit configured to transmit and receive a radio signal; and

a processor connected to the RF unit,

wherein the processor receives frame configuration information about an RS frame from a BS, configures a frame, comprising a DL access zone in which a signal is transmitted to a relay MS connected to the RS, a DL relay zone in which a signal is received from the BS, an UL access zone in which a signal is received from the relay MS connected to the RS, and an UL relay zone in which a signal is transmitted to the BS, on the basis of the frame configuration information, configures a transition time in the DL access zone or the UL relay zone, transmits the signal in the DL access zone or the UL relay zone, and receives the signal in the DL relay zone or the UL access zone.