METHOD FOR TRANSMITTING RANDOM ACCESS CHANNEL MESSAGE AND RESPONSE MESSAGE, AND MOBILE COMMUNICATION TERMINAL

• US 20100046384A1
• Filed: 10/30/2007
• Published: 02/25/2010
• Est. Priority Date: 10/30/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Sung Jun, Lee, Young Dae, Chun, Sung Duck
• Granted Patent: US 8,442,017 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

A method for responding to a random access channel message, a method for transmitting a random access channel message and a mobile communication terminal for supporting the same are disclosed. The method for responding to a random access channel message includes reading quality measurement information of a downlink channel from a second layer header of a random access channel (RACH) message which is transmitted from a user equipment to an uplink, controlling transmission power of a response message for the RACH message according to the quality measurement information; and transmitting the response message to the user equipment. Since transmission power can be adaptively controlled according to a channel measurement result of the user equipment, a radio resource can be efficiently used. In a method in which information indicating whether or not quality measurement information is included or whether or not upper layer information is included is notified to a base station through a header, compatibility between the existing user equipment and a radio network can be maintained.

Claims

1. A method for responding to a random access channel message, the method comprising:

reading quality measurement information of a downlink channel from a second layer header of a random access channel (RACH) message which is transmitted from a user equipment to an uplink;

controlling transmission power of a response message for the RACH message according to the quality measurement information; and

transmitting the response message to the user equipment.

2. The method according to claim 1, wherein the second layer header is a medium access control (MAC) header configuring an MAC protocol data unit (PDU).

3. The method according to claim 2, wherein the controlling of the transmission power comprises removing the quality measurement information from the MAC PDU and transmitting the MAC PDU to the MAC of a radio network controller (RNC), if upper layer information is included in the MAC PDU of the RACH message.

4. The method according to claim 3, wherein the upper layer information is a radio resource control (RRC) message transmitted through at least one of a common control channel (CCCH), a dedicated control channel (DCCH) and a dedicated traffic channel (DTCH), all of which are logic channels.

5. The method according to claim 1, wherein the response message includes any one of an acknowledge (ACK) response for notifying that the RACH message is successfully received and a non-acknowledge (NACK) response for notifying that the RACH message is not successfully received.

6. A method for responding to a random access channel message, the method comprising:

reading quality measurement information of a downlink channel included in a payload next to a second layer header from a random access channel (RACH) message which is transmitted from a user equipment to an uplink;

controlling transmission power of a response message for the RACH message according to the quality measurement information; and

transmitting the response message to the user equipment.

7. The method according to claim 6, wherein the RACH message stores information, which indicates whether or not the quality measurement information is included in the payload, in a target channel type field (TCTF) of the second layer header.

8. A method for transmitting a random access channel message, the method comprising:

at a user equipment, measuring quality of a downlink channel and generating quality measurement information of the downlink channel; and

including the quality measurement information in a second layer header of a random access channel (RACH) message and transmitting the RACH message to an uplink.

9. The method according to claim 8, wherein the transmitting of the RACH message to the uplink comprises transmitting a preamble to the uplink, retransmitting the preamble to the uplink if a response for the preamble is not received or a non-acknowledge response is received, and transmitting the RACH message to the uplink if an acknowledge response for the preamble is received.

10. The method according to claim 8, wherein the second layer header is a medium access control (MAC) header configuring an MAC protocol data unit (PDU).

11. The method according to claim 8, wherein the second layer header stores information, which indicates whether or not the quality measurement information is included in the second layer header, in a target channel type field (TCTF).

12. The method according to claim 8, further comprising retransmitting the RACH message to the uplink if the response message for the RACH message is a non-acknowledge response.

13. A method for transmitting a random access channel message, the method comprising:

at a user equipment, measuring quality of a downlink channel and generating quality measurement information of the downlink channel; and

including the quality measurement information in a payload next to a second layer header of a random access channel (RACH) message and transmitting the RACH message to an uplink.

14. The method according to claim 13, further comprising retransmitting the RACH message to the uplink if the response message for the RACH message is a non-acknowledge response.

15. A mobile communication terminal for transmitting data to an uplink through random access in a mobile communication system, the mobile communication terminal comprising:

a downlink channel measurement unit which measures quality of a downlink channel and generates quality measurement information of the downlink channel; and

a message transmission unit which includes the quality measurement information in a second layer header of a random access channel (RACH) message and transmitting the RACH message to the uplink.

16. A mobile communication terminal for transmitting data to an uplink through random access in a mobile communication system, the mobile communication terminal comprising:

a downlink channel measurement unit which measures quality of a downlink channel and generates quality measurement information of the downlink channel; and

a message transmission unit which includes the quality measurement information in payload next to a second layer header of a random access channel (RACH) message and transmitting the RACH message to the uplink.