METHOD FOR TRANSMITTING A RANGING SIGNAL IN A WIRELESS COMMUNICATION SYSTEM

• US 20120113955A1
• Filed: 07/12/2010
• Published: 05/10/2012
• Est. Priority Date: 07/13/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Cho, Han Gyu, Kwak, Jin Sam, Lee, Hyun Woo, Choi, Jin Soo
• Granted Patent: US 8,681,734 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

The present invention relates to a method in which a terminal transmits a ranging signal in a wireless communication system. The method comprises a step of acquiring cell identification information using the preamble received from a base station, a step of determining frequency resource allocation information using the cell identification information and information on the number of allocated subbands, and a step of transmitting a ranging signal using the sub-band indicated by the frequency resource allocation information.

Claims

1. A method for transmitting a ranging signal from a user equipment in a wireless communication system, the method comprising the steps of:

acquiring cell identification information by using a preamble received from a base station;

determining frequency resource allocation information by using the cell identification information and information on the number of allocated subbands; and

transmitting a ranging signal by using the sub-band indicated by the frequency resource allocation information.

2. The method according to claim 1, wherein the frequency resource allocation information includes index information on the subband used for transmission of the ranging signal.

3. The method according to claim 2, wherein index of the subband is determined using the following Equation:

<

Equation>

I_SB=mod(CellID,K_SB)

in the above Equation, I_SB represents index of subband to which a ranging channel resource is allocated, CellID represents identification information of a cell to which the user equipment belongs, and K_SB represents a total number of subbands allocated to the user equipment.

4. The method according to claim 1, further comprising the step of receiving information on a subframe for transmitting the ranging signal from the base station through a super frame header.

5. The method according to claim 1, further comprising the step of configuring time resource allocation information by using the cell identification information, information on the number of ranging channels allocated per subframe and information on the number of time resource units of at least one of super frame, frame, and subframe.

6. The method according to claim 5, wherein the time resource allocation information includes index information on the subframe for transmitting the ranging signal.

7. The method according to claim 6, wherein index of the subframe is determined using the following Equation:

<

Equation>

I_SF=mod(f(CellID),n_SF*n_F/N_—

RCH),

in the above Equation, ISF represents index of subframe to which ranging channel resources are allocated, nSF represents the number of subframes constituting one frame, nF represents the number of frames constituting one super frame, N_RCH represents the number of ranging channels allocated per subframe, and mod(A, B) represents a modulo function that means the remainder obtained by dividing A by B.

8. A user equipment in a wireless communication system, the user equipment comprising:

a Tx module for transmitting a radio signal;

an Rx module for receiving the radio signal; and

a processor acquiring cell identification information by using a preamble received from a base station through the Rx module and determining frequency resource allocation information by using the cell identification information and information on the number of allocated subbands,

wherein the user equipment transmits a ranging signal by using the subband indicated by the frequency resource allocation information through the Tx module.

9. The user equipment according to claim 8, wherein the frequency resource allocation information is index information on the subband used for transmission of the ranging signal.

10. The user equipment according to claim 9, wherein the processor determines index of the subband by using the following Equation:

<

Equation>

I_SB=mod(CellID,K_SB),

in the above Equation, ISB represents index of subband to which a ranging channel resource is allocated, KSB represents a total number of allocated subbands, and mod (A, B) represents a modulo function that means the remainder obtained by dividing A by B.

11. The user equipment according to claim 8, wherein the processor includes time resource allocation information by using the cell identification information, information on the number of time resource units of at least one of super frame, frame and subframe, and information on the number of ranging channels allocated per subframe.

12. The user equipment according to claim 11, wherein the time resource allocation information is index information on subframe for transmitting the ranging signal.

13. The user equipment according to claim 12, wherein the processor determines index of the subframe by using the following Equation:

<

Equation>

I_SF=mod(f(CellID),n_SF*n_F/N_—

RCH)

in the above Equation, ISF represents index of subframe to which ranging channel resources are allocated, nSF represents the number of subframes constituting one frame, nF represents the number of frames constituting one super frame, N_RCH represents the number of ranging channels allocated per subframe, and mod(A, B) represents a modulo function that means the remainder obtained by dividing A by B.

14. The user equipment according to claim 8, receiving information on subframe for transmitting the ranging signal through a super frame header from the base station through the Rx module.