HIGH SPEED ACCESS SYSTEM AND METHOD IN A MOBILE COMMUNICATIONS NETWORK

• US 20100210243A1
• Filed: 10/09/2008
• Published: 08/19/2010
• Est. Priority Date: 10/10/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Vujcic, Dragan
• Granted Patent: US 8,295,229 B2
• Time in Patent Office: Days
• US Class Current: 455/411
• CPC Class Codes: H04B 1/7073 Synchronisation aspects
• CPC Class Codes: H04B 7/2637 for logical channel control
• CPC Class Codes: H04J 13/0044 OVSF [orthogonal variable spreading factor]

Abstract

A method of selecting signatures for a random access in a wireless communication system is presented. The method includes receiving information comprising at least one root sequence index, a cyclic shift parameter, and a configuration parameter that corresponds to different power metric threshold values, providing at least one root sequence table for random access transmission according to the configuration parameter, and accessing the at least one root sequence table is accessed to generate a predetermined number of signatures for accessing the base station, the at least one root sequence table accessed according to the at least one root sequence index and the cyclic shift parameters, wherein the root sequence table comprises a plurality of root sequences arranged in first and second root sequence groups.

Claims

1. A method of selecting signatures for a random access in a wireless communication system, the method comprising:

receiving information comprising at least one root sequence index, a cyclic shift parameter, and a configuration parameter that corresponds to different power metric threshold values;

providing at least one root sequence table for random access transmission according to the configuration parameter; and

accessing the at least one root sequence table to generate a predetermined number of signatures for accessing a base station, the at least one root sequence table accessed according to the at least one root sequence index and the cyclic shift parameters,

wherein the root sequence table comprises a plurality of root sequences arranged in first and second root sequence groups, the first root sequence group corresponding to signatures that are less than or equal to a predetermined cubic metric value and the second group corresponding to signatures that are greater than the predetermined cubic metric value.

2. The method of claim 1, wherein each of the first and second root sequence groups further comprise signature sub-groups that are arranged according to at least one of alternate power metric ordering in adjacent signature sub-groups, and an alternate maximum cyclic shift.

3. The method of claim 1, wherein the root sequence table comprises 839 root sequences.

4. The method of claim 2, wherein the number of root sequences in each signature sub-group is modified in accordance to the configuration parameter.

5. The method of claim 1, further comprising providing a plurality of root sequence tables, each root sequence table comprising root sequences arranged in different order according to the predetermined cubic metric value.

6. The method of claim 1, further comprising generating a second root sequence table from the at least one root sequence table, the second root sequence table having root sequences arranged in different order according to the predetermined cubic metric value.

7. The method of claim 1, further comprising receiving from the base station information comprising a high speed bit that identifies the use of either the first or second root sequence groups of the root sequence table.

8. A method of selecting signatures for a random access in a wireless communication system, the method comprising:

transmitting to a mobile terminal information comprising at least one root sequence index, a cyclic shift parameter, a configuration parameter that corresponds to different power metric threshold values, or a combination thereof;

providing at least one root sequence table for random access transmission according to the configuration parameter; and

accessing the at least one root sequence table to generate a predetermined number of signatures for accessing the base station, the at least one root sequence table accessed according to the at least one root sequence index and the cyclic shift parameters,

wherein the root sequence table comprises a plurality of root sequences arranged in first and second root sequence groups, the first root sequence group corresponding to signatures that are less than or equal to a predetermined cubic metric value and the second group corresponding to signatures that are greater than the predetermined cubic metric value.

9. The method of claim 8, wherein each of the first and second root sequence groups further comprise signature sub-groups that are arranged according to at least one of alternate power metric ordering in adjacent signature sub-groups, alternate maximum cyclic shift, or a combination thereof.

10. The method of claim 8, wherein the root sequence table comprises 839 root sequences.

11. The method of claim 9, wherein the number of root sequences in each signature sub-group is modified in accordance to the configuration parameter.

12. The method of claim 8, further comprising providing a plurality of root sequence tables, each root sequence table comprising root sequences arranged in different order according to the predetermined cubic metric value.

13. The method of claim 8, further comprising generating a second root sequence table from the at least one root sequence table, the second root sequence table having root sequences arranged in different order according to the predetermined cubic metric value.

14. The method of claim 8, further comprising transmitting information comprising a high speed bit that identifies the use either the first or second root sequence groups of a root sequence table.

15. A mobile terminal for of establishing a communication link with a network, the mobile terminal comprising:

a transmitting/receiving unit receiving information comprising at least one root sequence index, a cyclic shift parameter, and a configuration parameter that corresponds to different power metric threshold values;

a display unit displaying user interface information;

an input unit receiving inputs from a user; and

a processing unit processing the received configuration parameters to provide at least one root sequence table for random access transmission according to the configuration parameter and accessing the at least one root sequence table to generate a predetermined number of signatures for accessing the base station, the at least one root sequence table accessed according to the at least one root sequence index and the cyclic shift parameters,

wherein the root sequence table comprises a plurality of root sequences arranged in first and second root sequence groups, the first root sequence group corresponding to signatures that are less than or equal to a predetermined cubic metric value and the second group corresponding to signatures that are greater than the predetermined cubic metric value.

16-21. -21. (canceled)

22. A network for establishing a communication link with a mobile terminal, the network comprising:

a transmitter transmitting information comprising at least one root sequence index, a cyclic shift parameter, and a configuration parameter that corresponds to different power metric threshold values;

a receiver receiving messages from the mobile terminal; and

a controller processing the received configuration parameters to provide at least one root sequence table for random access transmission according to the configuration parameter and accessing the at least one root sequence table to generate a predetermined number of signatures for accessing the base station, the at least one root sequence table accessed according to the at least one root sequence index and the cyclic shift parameters,

wherein the root sequence table comprises a plurality of root sequences arranged in first and second root sequence groups, the first root sequence group corresponding to signatures that are less than or equal to a predetermined cubic metric value and the second group corresponding to signatures that are greater than the predetermined cubic metric value.

23-28. -28. (canceled)