OPTIMIZED RANDOM ACCESS CHANNEL (RACH) ACCESS

• US 20100323736A1
• Filed: 02/05/2008
• Published: 12/23/2010
• Est. Priority Date: 02/07/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Fischer, Patrick, Feuillette, Remi
• Granted Patent: US 8,526,986 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• 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 74/004 in the uplink, i.e. towards network
• 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
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus to reduce the overhead related to allocation of the terminal identifier in a random access procedure and an optimized method for detecting a collision are provided. By allocating a “short” terminal identifier in the Random Access Response that is identifiers and allocating the permanent terminal identifier at the end of the random access procedure, the size of data that must be transmitted in the Random Access Response is reduced and power is saved.

Claims

1. A method of establishing a communication link between a mobile terminal and a network, the method comprising:

requesting access to the network;

receiving a response acknowledging receipt of the access request, the response comprising resources for accessing the network and information related to a mobile terminal identifier; and

forming a mobile terminal identifier by adding to the information.

2. The method of claim 1, wherein forming the mobile terminal identifier comprises adding to the information such that the mobile terminal identifier is longer than the information.

3. The method of claim 2, wherein the information comprises the LSB of the mobile terminal identifier.

4. The method of claim 1, further comprising:

transmitting data using the mobile terminal identifier.

5. A method of establishing a communication link between a mobile terminal and a network, the method comprising:

receiving a request for access to the network; and

transmitting a response acknowledging receipt of the access request, the response comprising resources for accessing the network and information related to a mobile terminal identifier; and

receiving data comprising a mobile terminal identifier formed by adding to the information.

6. The method of claim 5, further comprising:

selecting a mobile terminal identifier; and

determining the information according to the selected mobile terminal identifier.

7. The method of claim 6, wherein the information comprises the LSB of the selected mobile terminal identifier.

8. A method of establishing a communication link between a mobile terminal and a network, the method comprising:

receiving an indication of a cell-specific mobile terminal identifier;

requesting access to the network;

receiving a response acknowledging receipt of the access request, the response comprising resources for accessing the network and a temporary mobile terminal identifier;

transmitting a data message using the resources, the data message comprising the cell-specific mobile terminal identifier; and

requesting access to the network again if a message addressed using the cell-specific mobile terminal identifier is not received within a specified period of time.

9. The method of claim 8, wherein the response acknowledging receipt of the access request is addressed using a common access identifier.

10. The method of claim 8, wherein the data message is addressed using a temporary mobile terminal identifier.

11. The method of claim 8, wherein the data message further comprises a cell-specific mobile terminal identifier type.

12. The method of claim 8, wherein the mobile terminal-specific mobile terminal identifier comprises a private C-RNTI.

13. A method of establishing a communication link between a mobile terminal and a network, the method comprising:

receiving a request for access to the network;

transmitting a response acknowledging receipt of the access request, the response comprising resources for accessing the network and a temporary mobile terminal identifier;

receiving a data message sent using the resources, the data message comprising a mobile terminal identifier and a mobile terminal identifier type;

transmitting a message addressed using the mobile terminal identifier only if the mobile terminal identifier type is a specified type.

14. The method of claim 13, wherein the response acknowledging receipt of the access request is addressed using a common access identifier.

15. The method of claim 13, wherein the data message is addressed using a temporary mobile terminal identifier.

16. The method of claim 13, wherein the specified type is C-RNTI.

17. A method of establishing a communication link between a mobile terminal and a network, the method comprising:

requesting access to the network;

receiving a response acknowledging receipt of the access request, the response comprising resources for accessing the network and a first mobile terminal identifier;

transmitting a data message using the resources, the data message comprising a second mobile terminal identifier and second mobile terminal identifier type;

requesting access to the network again if a message addressed using the second mobile terminal identifier and second mobile terminal identifier type is not received within a specified period of time.

18. The method claim 17, wherein the second mobile terminal identifier comprises a UE Id and the second mobile terminal identifier type indicates one of ‘

TMSI’

, ‘

IMEI’ and

‘

IMSI’

.

19. A method of establishing a communication link between a mobile terminal and a network, the method comprising:

receiving a request for access to the network;

transmitting a response acknowledging receipt of the access request, the response comprising resources for accessing the network and a first mobile terminal identifier;

receiving a data message using the resources, the data message comprising a second mobile terminal identifier and second mobile terminal identifier type;

transmitting a message, the message comprising the second mobile terminal identifier and the second mobile terminal identifier type.

20. The method of claim 19, wherein the second mobile terminal identifier comprises a UE Id and the second mobile terminal identifier type indicates one of ‘

C-RNTI’

, ‘

TMSI’

, ‘

IMEI’ and

‘

IMSI’

.

21. A mobile terminal for establishing a communication link between the mobile terminal and a network, the mobile terminal comprising:

a transmitting unit transmitting a request for access to the network;

a receiving unit receiving a response acknowledging receipt of the access request, the response comprising resources for accessing the network and information related to a mobile terminal identifier;

a display unit displaying information;

an input unit receiving inputs from a user; and

a processing unit forming a mobile terminal identifier by adding to the information.

22. The mobile terminal of claim 21, wherein the processing unit forms the mobile terminal identifier by adding to the information such that the mobile terminal identifier is longer than the information.

23. The mobile terminal of claim 21, wherein the information comprises the LSB of the mobile terminal identifier.

24. The mobile terminal of claim 21, wherein the processing unit controls the transmitting unit to transmit data using the mobile terminal identifier.

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

a receiver receiving a request for access to the network;

a transmitter transmitting a response acknowledging receipt of the access request, the response comprising resources for accessing the network and information related to a mobile terminal identifier; and

a controller processing data comprising a mobile terminal identifier formed by adding to the information.

26. The network of claim 25, wherein the controller further selects a mobile terminal identifier and determines the information according to the selected mobile terminal identifier.

27. The network of claim 26, wherein the information comprises the LSB of the selected mobile terminal identifier.

28. A mobile terminal for establishing a communication link between the mobile terminal and a network, the mobile terminal comprising:

a receiving unit receiving an indication of a cell-specific mobile terminal identifier;

a transmitting unit transmitting a request for access to the network;

a display unit displaying information;

an input unit receiving inputs from a user; and

a processing unit processing a received response acknowledging receipt of the access request, the response comprising resources for accessing the network and a temporary mobile terminal identifier, controlling the transmitting unit to transmit a data message using the resources, the data message comprising the cell-specific mobile terminal identifier and controlling the transmitting unit to request access to the network again if a message addressed using the cell-specific mobile terminal identifier is not received within a specified period of time.

29. The mobile terminal of claim 28, wherein the response acknowledging receipt of the access request is addressed using a common access identifier.

30. The mobile terminal of claim 28, wherein the processing unit addresses the data message using a temporary mobile terminal identifier.

31. The mobile terminal of claim 28, wherein the data message further comprises a cell-specific mobile terminal identifier type.

32. The mobile terminal of claim 28, wherein the cell-specific mobile terminal identifier comprises a private C-RNTI.

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

a receiver receiving a request for access to the network;

a transmitter transmitting a response acknowledging receipt of the access request, the response comprising resources for accessing the network and a temporary mobile terminal identifier; and

a controller processing a data message sent using the resources, the data message comprising a mobile terminal identifier and a mobile terminal identifier type, and controlling the transmitting unit to transmit a message addressed using the mobile terminal identifier only if the mobile terminal identifier type is a specified type.

34. The network of claim 33, wherein controller addresses the response acknowledging receipt of the access request using a common access identifier.

35. The network of claim 33, wherein the data message is addressed using a temporary mobile terminal identifier.

36. The network of claim 33, wherein the specified type is C-RNTI.

37. A mobile terminal for establishing a communication link between the mobile terminal and a network, the mobile terminal comprising:

a transmitting unit transmitting a request for access to the network;

a receiving unit receiving a response acknowledging receipt of the access request, the response comprising resources for accessing the network and a first mobile terminal identifier;

a display unit displaying information;

an input unit receiving inputs from a user; and

a processing unit controlling the transmitting unit to transmit a data message using the resources, the data message comprising a second mobile terminal identifier and second mobile terminal identifier type, and controlling the transmitting unit to request access to the network again if a message addressed using the second mobile terminal identifier and second mobile terminal identifier type is not received within a specified period of time.

38. The mobile terminal of claim 37, wherein the second mobile terminal identifier comprises a UE Id and the second mobile terminal identifier type indicates one of ‘

TMSI’

, ‘

IMEI’ and

‘

IMSI’

.

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

a receiver receiving a request for access to the network;

a transmitter transmitting a response acknowledging receipt of the access request, the response comprising resources for accessing the network and a first mobile terminal identifier; and

a controller processing a data message sent using the resources, the data message comprising a second mobile terminal identifier and second mobile terminal identifier type, and controlling the transmitting unit to transmit a message, the message comprising the second mobile terminal identifier and the second mobile terminal identifier type only if the second mobile terminal identifier type is the specified type.

40. The network of claim 39, wherein the second mobile terminal identifier comprises a UE Id and the second mobile terminal identifier type indicates one of ‘

C-RNTI’

, TMSI’

, ‘

IMEI’ and

‘

IMSI’

.