RANDOM ACCESS CHANNEL FREQUENCY ALLOCATION

• US 20090203384A1
• Filed: 02/09/2009
• Published: 08/13/2009
• Est. Priority Date: 02/10/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: VUJCIC, Dragan
• Granted Patent: US 8,295,850 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

The present invention provides a method of allocating a frequency parameter for random access preamble transmission. The method includes determining a fixed location, in an operating bandwidth, of a frequency region for random access transmission wherein a relative location parameter defines the fixed location of the frequency region according to a bandwidth parameter, the relative location parameter being common to a plurality of cells. The present invention further provides a method of allocating a frequency parameter for random access transmission. The method comprises allocating a fixed location, in an operating bandwidth, of a frequency region for random access transmission, wherein the fixed location is configurable per cell.

Claims

1. A method of allocating a frequency parameter for random access preamble transmission, the method comprising:

determining a fixed location, in an operating bandwidth, of a frequency region for random access transmission;

wherein a relative location parameter defines the fixed location of the frequency region according to a bandwidth parameter, the relative location parameter being common to a plurality of cells.

2. A method according to claim 1, wherein the fixed location is determined as a function of the total operating bandwidth.

3. A method according to claim 1, wherein the relative location parameter is defined as a frequency offset relative to the middle of the operating bandwidth.

4. A method according to claim 3 wherein the frequency offset is expressed as a number of sub-carriers in the frequency domain.

5. A method according to claim 1, wherein the fixed location is such that the frequency region for random access transmission overlaps the control channel frequency region.

6. A method according to claim 1 wherein the range of the frequency offset X is expressed as:

0≦

X≦

(N_RB^UL−

6)/2

where N_RB^UL represents the operating bandwidth expressed in multiples of resource block size in the frequency domain.

7. A method according to claim 1 wherein the relative location parameter is selected by the network entity.

8. A method according to claim 1, wherein the relative location parameter is defined in an operating standard.

9. A method of allocating a frequency parameter for random access transmission, the method comprising

allocating a fixed location, in an operating bandwidth, of a frequency region for random access transmission, wherein the fixed location is configurable per cell.

10. A method according to claim 9, wherein the fixed location is determined using as a location parameter X where:

0≦

X≦

(N_RB^UL−

6)

where N_RB^UL represents the operating bandwidth expressed in multiples of resource block size in the frequency domain expressed in terms of frequency carriers.

11. A method according to claim 9 wherein the fixed location of the frequency region is selected by a network entity.

12. A user equipment for allocating a frequency parameter for random access preamble transmission, the user equipment comprising:

a transceiver;

a processor for determining a fixed location, in an operating bandwidth of a frequency region for random access transmission;

wherein the processor is operable to determine the fixed location according to a relative location parameter for defining the fixed location of the frequency region as a function of a bandwidth parameter, the relative location parameter being common to a plurality of cells.

13. A user equipment according to claim 12 wherein the fixed location of the frequency region is selected by a network entity.

14. A user equipment for allocating a allocating a frequency parameter for random access transmission, the user equipment comprising

a transceiver;

a processor for allocating a fixed location, in an operating bandwidth, of a frequency region for random access transmission, wherein the fixed location is configurable per cell.

15. A user equipment according to claim 14 wherein the fixed location of the frequency region is selected by a network entity of the corresponding cell.