APPARATUS AND METHOD FOR PREAMBLE PSEUDO NOISE CODE ALLOCATION IN BROADBAND WIRELESS COMMUNICATION SYSTEM

• US 20080291871A1
• Filed: 02/05/2008
• Published: 11/27/2008
• Est. Priority Date: 02/06/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Oh, Soo-Yeul, Sung, Ki-Won
• Granted Patent: US 8,189,520 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

An apparatus and a method for preamble pseudo noise code allocation in a broadband wireless communication system are provided. The method includes defining an inherent index for each FA, allocating a preamble PN index to base stations using a reference FA index, defining an inherent offset by each FA for remaining FA indexes, and shifting the preamble PN index allocated to the base stations using the reference FA index by the defined offset, and allocating the preamble PN index to base stations using the remaining FA indexes. The price of a system can thus be lowered by reducing a Peak-to-Average Power Ratio (PAPR) of a preamble, increase the number of FAs that a specific amplifier can amplify, and immediately allocate a preamble PN index when adding a new FA during an operation of a system.

Claims

1. A preamble Pseudo Noise (PN) code allocation method in a broadband wireless communication system using a plurality of Frequency Allocations (FAs), the method comprising:

defining an inherent index for each FA;

allocating a preamble PN index to base stations using a reference FA index;

defining an inherent offset by each FA for remaining FA indexes; and

shifting the preamble PN index allocated to the base stations using the reference FA index by the offset, and allocating a preamble PN index to base stations using the remaining FA indexes.

2. The method of claim 1, wherein defining an inherent index for each FA comprises:

allocating an index to an FA; and

taking the index allocated to the FA as a minimum value and allocating FA indexes which increase by 1 to remaining FAs.

3. The method of claim 1, wherein the preamble PN index is allocated in the same way as that used in a system employing one FA.

4. The method of claim 1, wherein the inherent offset by each FA is defined by the inherent index of each FA.

5. The method of claim 1, wherein a modulo operation is implemented for a shifted value with the number of the preamble PN indexes to make the shifted value not greater than a maximum value of the preamble PN index.

6. The method of claim 1, wherein the preamble PN indexes for the base stations using the remaining FA indexes are allocated by:

PN_i=(PN_o+i)mod N_PN

wherein the PN_i is a preamble PN index for the base stations using an FA index i, mod is a modulo operation, the PN₀ is a preamble PN index for the base stations using a reference FA index, and the N_PN is the number of the preamble PN indexes.

7. A preamble Pseudo Noise (PN) code allocation apparatus in a broadband wireless communication system using a plurality of Frequency Allocations (FAs), the apparatus comprising:

an FA index determining device for defining an inherent index of each FA;

a preamble PN index allocation device for a reference FA index, for allocating a preamble PN index to base stations using a reference FA index; and

a preamble PN index allocation device for remaining FA indexes, for defining an inherent offset by each FA for the remaining FA indexes, shifting the preamble PN index allocated to the base stations using the reference FA index by the offset, and allocating the preamble PN index to base stations using the remaining FA indexes.

8. The apparatus of claim 7, wherein the FA index determining device allocates an index to one FA, takes the index allocated to one FA as a minimum value, and allocates FA indexes which increase by 1 to remaining FAs, thereby defining the inherent index of each FA.

9. The apparatus of claim 7, wherein the preamble PN index allocation device for a reference FA index allocates the preamble PN index in the same way as that is used in a system employing one FA.

10. The apparatus of claim 7, wherein the preamble PN index allocation device for remaining FA indexes defines an inherent offset by each FA with the inherent index of each FA.

11. The apparatus of claim 7, wherein the preamble PN index allocation device for remaining FA indexes implements a modulo operation for the shifted value with the number of the preamble PN indexes to make the shifted value not greater than a maximum value of the preamble PN index.

12. The apparatus of claim 7, wherein the preamble PN index allocation device for remaining FA indexes allocates the preamble PN index for the base stations using the remaining FA indexes by:

PN_i=(PA_o+i)mod N_PN

wherein the PN_i is a preamble PN index for the base stations using an FA index i, mod is a modulo operation, the PN₀ is a preamble PN index for the base stations using a reference FA index, and the N_PN is the number of the preamble PN indexes.