Transmitting Information in Mobile Communications System

• US 20090011769A1
• Filed: 01/04/2007
• Published: 01/08/2009
• Est. Priority Date: 01/05/2006
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Fischer, Patrick, Park, Sung-Jun, Lee, Young-Dae, Chun, Sung-Duck, Jung, Myung-Cheul
• Granted Patent: US 7,881,724 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

Transmitting information using a preamble of a Random Access Channel (RACH) in an Evolved Universal mobile Telecommunications System (E-UMTS) is provided. A preamble transmission is used to inform a base station of specific information when a terminal uses a RACH and the base station efficiently allocates radio resources for data transmission to the terminal according to the specific information. Delay time before the terminal transmits data is reduced and unnecessary consumption of radio resources is minimized.

Claims

1. A method for allocating radio resources in a mobile communication system, the method comprising:

receiving grouping information related to signatures and occasions for accessing a Random Access Channel (RACH);

selecting one signature and one Random Access Channel (RACH) occasion according to the grouping information;

transmitting a preamble according to the selected signature and RACH occasion;

receiving a message comprising a radio resource allocated according to the selected signature and RACH occasion; and

transmitting data using the allocated radio resource.

2. The method of claim 1, wherein RACH signatures and occasions are grouped according to predetermined criteria.

3. The method of claim 2, wherein the predetermined criteria comprise at least one of a purpose for using RACH, Channel Quality Indicator (CQI) information, a requested amount of radio resources and an establishment cause.

4. The method of claim 3, wherein the purpose for using RACH comprises one of an initial access, handover, maintaining synchronization, an access release and a radio resource request.

5. The method of claim 3, wherein the establishment cause comprises one of an emergency call, transition from an idle state to an active state and transition from a disconnected state to an active state.

6. The method of claim 1, wherein the grouping information is received in one of system information and a paging message.

7. A method for allocating radio resources in a mobile communication system, the method comprising:

transmitting grouping information related to signatures and occasions for accessing a Random Access Channel (RACH);

receiving a preamble transmitted according to a signature and RACH occasion selected according to the grouping information;

transmitting a message comprising a radio resource allocated according to the selected signature and RACH occasion; and

receiving data transmitted using the allocated radio resource.

8. The method of claim 7, further comprising grouping the RACH signatures and occasions according to predetermined criteria.

9. The method of claim 8, wherein the predetermined criteria comprise at least one of a purpose for using RACH, Channel Quality Indicator (CQI) information, a requested amount of radio resources and an establishment cause.

10. The method of claim 9, wherein the purpose for using RACH comprises one of an initial access, handover, maintaining synchronization, an access release and a radio resource request.

11. The method of claim 9, wherein the establishment cause comprises one of an emergency call, transition from an idle state to an active state and transition from a disconnected state to an active state.

12. The method of claim 7, wherein the grouping information is transmitted in one of system information and a paging message.

13. The method of claim 7, further comprising:

changing and retransmitting the grouping information.

14. A method for allocating radio resources in a mobile communication system, the method comprising:

a network transmitting grouping information related to signatures and occasions for accessing a Random Access Channel (RACH);

a mobile communication terminal selecting one signature and one Random Access Channel (RACH) occasion according to the grouping information;

the mobile communication terminal transmitting a preamble according to the selected signature and RACH occasion;

the network transmitting a message comprising a radio resource allocated according to the selected signature and RACH occasion; and

the mobile communication terminal transmitting data using the allocated radio resource.

15. The method of claim 14, wherein RACH signatures and occasions are grouped according to predetermined criteria.

16. The method of claim 15, wherein the predetermined criteria comprise at least one of a purpose for using RACH, Channel Quality Indicator (CQI) information, a requested amount of radio resources and an establishment cause.

17. The method of claim 16, wherein the purpose for using RACH comprises one of an initial access, handover, maintaining synchronization, an access release and a radio resource request.

18. The method of claim 16, wherein the establishment cause comprises one of an emergency call, transition from an idle state to an active state and transition from a disconnected state to an active state.

19. The method of claim 14, wherein the network transmits the grouping information in one of system information and a paging message.

20. The method of claim 14, further comprising the network changing and retransmitting the grouping information.