Method of transmitting preamble for supporting relay system

• US 8,547,921 B2
• Filed: 12/03/2009
• Issued: 10/01/2013
• Est. Priority Date: 08/22/2008
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Youn, Ae Ran, Kwak, Jin Sam, Park, Kyu Jin, Chung, Ji Wook
• Primary Examiner(s): Thier, Michael
• Assistant Examiner(s): HAILE, FEBEN
• Application Number:
  US13/141,932
• Publication Number:
  US 20110261749A1
• Time in Patent Office: 1,398 Days
• Field of Search: 370/310, 370/315, 370/328, 370/329, 370/330, 370/331
• US Class Current: 370/329
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 56/0085 detecting a given structure in the signal
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

The present invention relates to a frame structure and method for supporting a relay. According to an embodiment of the present invention, a method for transmitting a preamble from a network supporting a relay includes transmitting a first preamble for establishing synchronization with at least one of a mobile station and a relay station, and transmitting a second preamble including supplemental information for accurately establishing synchronization with at least one of the mobile station and the relay station.

Claims

1. A method for transmitting a preamble in a network supporting a relay, the method comprising:

transmitting a first preamble through a downlink access zone, the first preamble being for establishing synchronization with at least one of a mobile station and relay stations divided into an odd-hop relay station and an even-hop relay station based upon a number of hops with the base station; and

transmitting a second preamble through a downlink relay zone, the second preamble including supplemental information for accurately establishing synchronization with at least one of the mobile station and the relay stations,

wherein the odd-hop relay station and the even-hop relay station transmit a third preamble to the mobile station or a subordinate relay station, the third preamble being used to establish synchronization with the odd-hop relay station and the even-hop relay station at a same time point where the first preamble is being transmitted.

2. The method of claim 1, wherein the second preamble is periodically transmitted with a predetermined time interval after the transmission of the first preamble.

3. The method of claim 1, wherein the first preamble and the second preamble include at least one of a synchronization channel and a broadcast channel.

4. The method of claim 1, wherein the third preamble is transmitted after a predetermined offset value from a time point where the first preamble is being transmitted.

5. A method for transmitting a preamble in a network supporting a relay, the method performed by a first relay station, the method comprising:

receiving a first preamble through a downlink access zone of a downlink, the first preamble being for establishing synchronization with the first relay station which is determined one of an odd-hop relay station and an even-hop relay station based upon a number of hops with the base station; and

receiving a second preamble through a downlink relay zone, the second preamble including supplemental information for accurately establishing synchronization with the first relay station,

transmitting a third preamble to the mobile station or a subordinate relay station, the third preamble being used to establish synchronization with the first relay station at a same time point where the first preamble is being transmitted, and

wherein the first preamble includes hop information on the first relay station.

6. The method of claim 5, wherein the hop information indicates whether the first relay station corresponds to an odd hop or an even hop.

7. The method of claim 5, wherein the first preamble is transmitted at a same time point as a preamble being transmitted from a base station and a preamble transmitted from a second relay station, and

wherein a frame structure used in the first relay station is configured of a downlink transmit zone and a downlink receive zone.

8. The method of claim 5,

wherein the downlink is configured in an order of a downlink transmit zone, a gap, and a downlink receive zone.

9. The method of claim 5, wherein the downlink is configured in an order of the downlink access zone, a first gap, a downlink receive zone, a second gap, and the downlink transmit zone.

10. The method of claim 9, wherein the first preamble is included in a super frame header, and wherein the second preamble is transmitted with a predetermined cycle period after the transmission of the first preamble.

11. The method of claim 5, wherein the downlink is configured in an order of the downlink access zone, the downlink transmit zone, a gap, and a downlink receive zone.

12. The method of claim 5, wherein the first preamble is transmitted only to the mobile station via a downlink access zone of the downlink, and wherein the downlink is configured in an order of the downlink access zone, a gap, and a bi-directional receive zone.

13. The method of claim 5, further comprising:

transmitting a second preamble from the first relay station to the mobile station or the second relay station via a bi-directional receive zone for accurately establishing synchronization with the first relay station,

wherein the first preamble is transmitted only to the mobile station via a downlink access zone of the downlink, and

wherein the downlink is configured of the downlink access zone, a first gap, and a second gap.

14. The method of claim 5, wherein the first preamble and the second preamble are transmitted from neighboring positions.

15. The method of claim 5, wherein the first preamble and the second preamble are spaced apart at a predetermined distance and transmitted.

16. A first relay station comprising:

a receiving module;

a transmitting module;

an antenna transmitting a wireless signal received from an outside environment to the receiving module and transmitting a wireless signal delivered from the transmission module to the outside environment, and

a controller which is configured to;

receive a first preamble through a downlink access zone of a downlink, the first preamble being for establishing synchronization with the first relay station which is determined one of an odd-hop relay station and an even-hop relay station based upon a number of hops with the base station; and

receive a second preamble through a downlink relay zone, the second preamble including supplemental information for accurately establishing synchronization with the first relay station,

transmit a third preamble to the mobile station or a subordinate relay station, the third preamble being used to establish synchronization with the first relay station at a same time point where the first preamble is being transmitted.

17. The first relay station of claim 16, wherein the first preamble further includes hop information, the hop information indicating whether the first relay station corresponds to an odd hop or an even hop.