Method and apparatus for configuring a transmission mode for a backhaul link transmission

• US 8,934,523 B2
• Filed: 07/13/2010
• Issued: 01/13/2015
• Est. Priority Date: 07/13/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chung, Jae Hoon, Lee, Moon Il, Han, Seung Hee, Noh, Min Seok
• Primary Examiner(s): Ghulamali, Qutbuddin
• Application Number:
  US13/383,804
• Publication Number:
  US 20120114021A1
• Time in Patent Office: 1,645 Days
• Field of Search: 375/211, 375315-324
• US Class Current: 375/211
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/15557 Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: H04W 92/12 between access points and access point controllers

Abstract

Provided is a method for configuring a transmission mode for a backhaul link transmission in a radio communication system including a relay station. The method comprises: a step in which a base station transmits, to the relay station, a relay-physical downlink control channel (R-PDCCH) containing backhaul control information; and a step in which the base station transmits, to the relay station, a relay-physical downlink shared channel (R-PDSCH) containing backhaul data, wherein the R-PDCCH is transmitted in one transmission mode selected from a plurality of predetermined transmission modes, and a reference signal transmitted through the R-PDCCH for the demodulation of the R-PDCCH is determined in accordance with said selected transmission mode.

Claims

1. A method of demodulating a signal, performed by a relay node, the method comprising:

receiving control information through a relay-physical downlink control channel (R-PDCCH) from an evolved-NodeB (eNB);

receiving a data through a relay-physical downlink shared channel (R-PDSCH) from the eNB; and

demodulating the control information and the data,

wherein when a number of transmission layers of the R-PDSCH is 2 or more than 2, reference signals among a plurality of reference signals transmitted by a specific one of a plurality of antenna ports are used for a demodulation of the control information.

2. The method of claim 1, wherein a number of the plurality of reference signals used for a demodulation of the data is same as a number of transmission layers of the R-PDSCH.

3. The method of claim 1, wherein a number of transmission layers of the R-PDCCH is 1.

4. The method of claim 1, wherein the control information and the data are received at different times in a same subframe.

5. The method of claim 1, wherein the reference signals used for a demodulation of the control information are selected in ascending order from a minimum index among a plurality of reference signals used for a demodulation of the data.

6. A relay node, 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 is configured for;

receiving control information through a relay-physical downlink control channel (R-PDCCH) from an evolved-NodeB (eNB);

receiving a data through a relay-physical downlink shared channel (R-PDSCH) from the eNB; and

demodulating the control information and the data,

wherein when a number of transmission layers of the R-PDSCH is 2 or more than 2, reference signals among a plurality of reference signals transmitted by a specific one of a plurality of antenna ports are used for a demodulation of the control information.

7. The relay node of claim 6, wherein a number of the plurality of reference signals used for a demodulation of the data is same as a number of transmission layers of the R-PDSCH.

8. The relay node of claim 6, wherein a number of transmission layers of the R-PDCCH is 1.

9. The relay node of claim 6, wherein the control information and the data are received at different times in a same subframe.

10. The relay node of claim 6, wherein the reference signals used for a demodulation of the control information are selected in ascending order from a minimum index among a plurality of reference signals used for a demodulation of the data.