Method for transmitting response information in mobile communications system

• US 7,839,829 B2
• Filed: 04/23/2009
• Issued: 11/23/2010
• Est. Priority Date: 02/07/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Young Dae, Park, Sung Jun, Chun, Sung Duck, Jung, Myung Cheul
• Primary Examiner(s): Kumar; Pankaj
• Assistant Examiner(s): Sharma; Gautam
• Application Number:
  US12/429,104
• Publication Number:
  US 20090201890A1
• Time in Patent Office: 579 Days
• Field of Search: 370/310, 370/329, 370/336, 455/436, 455/437
• US Class Current: 370/336
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/18 End to end
• CPC Class Codes: H04L 47/34 ensuring sequence integrity, e.g. using sequence numbers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• 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: Y02D 30/70 in wireless communication networks

Abstract

A method for transmitting radio resources in a mobile communication system is disclosed. The method includes receiving a random access channel (RACH) preamble from a plurality of UEs and transmitting response information associated with the received preambles over a common channel wherein the plurality UEs can access the common channel and receive corresponding information. If a HARQ scheme is used when a UE transmits data to the eNode-B using uplink radio resources allocated over the RACH, the eNode-B does not pre-allocate uplink radio resources required for re-transmission and performs allocation of radio resources for a first transmission of HARQ. If the re-transmission is required, the eNode-B allocates the radio resources required for the re-transmission with the NACK signal. If re-transmission is not required, the present invention can reduce an amount of wasted radio resources.

Claims

1. A method for a user equipment (UE) to perform a random access in a mobile communication system, the method comprising:

transmitting a specific random access preamble;

monitoring, after transmitting the specific random access preamble, a downlink control channel including control information regarding a location of a specific random access response, corresponding to the specific random access preamble, to be received within a downlink shared channel;

receiving the downlink shared channel including the specific random access response based on the control information in the downlink control channel, when the control information identifying the specific random access response is transmitted via the downlink shared channel is received via the downlink control channel; and

processing the specific random access response received via the downlink shared channel.

2. The method of claim 1, wherein the specific random access response is received as a part of a medium access control packet data unit (MAC PDU) received on the downlink shared channel.

3. The method of claim 2, wherein the MAC PDU comprises one or more random access responses comprising the specific random access response.

4. The method of claim 2, wherein the MAC PDU comprises a MAC header and one or more random access responses comprising the specific random access response.

5. The method of claim 4, wherein the MAC header comprises one or more header parts, each of the header parts corresponding to each of the random access responses.

6. The method of claim 1, wherein the specific random access response comprises uplink resource information allocated to the UE, a temporary identifier of the UE and a timing synchronization related variable.

7. The method of claim 6, further comprising:

transmitting an uplink signal using the uplink resource information.

8. A method for a network to control a random access of a user equipment (UE) in a mobile communication system, the method comprising:

receiving a specific random access preamble from the UE;

transmitting, after receiving the specific random access preamble, a downlink control channel including control information regarding a location of a specific random access response, corresponding to the specific random access preamble, to be transmitted within a downlink shared channel, the control information identifying a transmission of the specific random access response corresponding to the specific random access preamble via the downlink shared channel; and

transmitting the specific random access response via the downlink shared channel in accordance with the control information.

9. The method of claim 8, wherein the specific random access response is transmitted as a part of a medium access control packet data unit (MAC PDU) transmitted via the downlink shared channel.

10. The method of claim 9, wherein the MAC PDU comprises one or more random access responses comprising the specific random access response.

11. The method of claim 9, wherein the MAC PDU comprises a MAC header and one or more random access responses comprising the specific random access response.

12. The method of claim 11, wherein the MAC header comprises one or more header parts, each of the header parts corresponding to each of the random access responses.

13. The method of claim 8, wherein the specific random access response comprises uplink resource information allocated to the UE, a temporary identifier of the UE and a timing synchronization related variable.

14. The method of claim 13, further comprising:

receiving an uplink signal associated with the uplink resource information.