Method and apparatus for relaying data in wireless communication system based on TDD

• US 9,271,277 B2
• Filed: 11/02/2009
• Issued: 02/23/2016
• Est. Priority Date: 11/11/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Byoung Hoon, Kwon, Yeong Hyeon, Seo, Han Byul, Chung, Jae Hoon, Yun, Young Woo, Lee, Dae Won
• Primary Examiner(s): Smith, Marcus R.
• Assistant Examiner(s): ALI, SYED
• Application Number:
  US13/128,539
• Publication Number:
  US 20110228709A1
• Time in Patent Office: 2,304 Days
• Field of Search: 370/279, 455/13.1
• US Class Current: 1/1
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04J 3/00 Time-division multiplex systems H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention provides a method and an apparatus of relaying data in a wireless communication system based on Time Division Duplex (TDD). A relay station receives downlink data from a base station in an uplink subframe and relays the downlink data to at least one mobile station. Accordingly, the efficiency of resource allocation for a relay station can be improved.

Claims

1. A method of relaying data in a wireless communication system based on Time Division Duplex (TDD) using a radio frame comprising a plurality of subframes, each of the plurality of subframes comprising at least one or more downlink subframes and at least one or more uplink subframes that are defined between a base station and at least one mobile station, the method performed by a relay station and comprising:

receiving swapped subframe information informing that a first uplink subframe among only the at least one or more uplink subframes, except for the at least one or more downlink subframes, is to be changed into a downlink subframe,

wherein the first uplink subframe was originally designated as an uplink subframe only for the at least one mobile station for transmission to the base station, but is changed by the base station into the downlink subframe to transmit a downlink data to the relay station;

receiving, by the relay station and from the base station, the downlink data on first resources of the first uplink subframe,

wherein the base station lowers a transmit power on the first uplink subframe thereby reducing an interference, and wherein the first resources used by the base station to transmit the downlink data in the first uplink subframe do not overlap with resources used by the mobile station to transmit an uplink data; and

relaying, by the relay station, the downlink data to the at least one mobile station.

2. The method of claim 1, wherein the resources are subject to time division or frequency division.

3. The method of claim 1, wherein the radio frame comprises 10 subframes.

4. The method of claim 3, wherein the radio frame corresponds to at least any one of configurations in Table 1 below, wherein ‘

D’

denotes a downlink subframe, ‘

U’

denotes an uplink subframe, and ‘

S’

denotes a special subframe;

5. A relay station in a wireless communication system based on Time Division Duplex (TDD) using a radio frame comprising a plurality of subframes, the plurality of subframes comprising at least one or more downlink subframes and at least one or more uplink subframes that are defined between a base station and at least one mobile station, the relay station comprising:

a transceiver configured to transmit or receive a radio signal; and

a processor coupled to the transceiver and configured to;

receive swapped subframe information informing that a first uplink subframe among only the at least one or more uplink subframes, except for the at least one or more downlink subframes, is to be changed into a downlink subframe,

wherein the first uplink subframe was originally designated as an uplink subframe only for the at least one mobile station for transmission to the base station, but is changed by the base station into the downlink subframe to transmit a downlink data to the relay station;

receive, from the base station, the downlink data on first resources of the first uplink subframe,

wherein the base station lowers a transmit power on the first uplink subframe thereby reducing an interference, and wherein the first resources used by the base station to transmit the downlink data in the first uplink subframe do not overlap with resources used by the mobile station to transmit an uplink data; and

relay the downlink data to the at least one mobile station.