Method for reporting channel quality through uplink common channel in wireless communication

1. A method of transmitting channel quality information (CQI) in a mobile communications system, the method comprising:

periodically checking whether a request for reporting the channel quality information is received from a network,

wherein the request is transmitted from the network for a report of channel quality

wherein the request is received through a High Speed-Shared Control Channel (HS-SCCH),

wherein an identifier of a corresponding terminal is also received from the network through the HS-SCCH, and

wherein the identifier of the corresponding terminal is a HS-DSCH Radio Network Temporary Identifier (H-RNTI); and

transmitting the channel quality information to the network after the request is received according to the checking step,

wherein the channel quality information is transmitted to the network through a random access channel (RACH) procedure,

wherein the channel quality information is included in a medium access control protocol data unit (MAC PDU) of a RACH message,

wherein the MAC PDU including the CQI is transmitted to the network through a High Speed-Downlink Shared Channel (HS-DSCH),

wherein a format of the MAC PDU transmitted through the HS-DSCH is determined by the H-RNTI received through the HS-SCCH, and

wherein the RACH message is transmitted in a transmission time interval (TTI) of every 2 ms

wherein the MAC PDU comprises: a TCTF (Type Channel Type Field) which used to indicate a type of logical channel; a terminal ID to identify a channel quality measurement terminal; and an indicator in a preamble of the MAC PDU to indicate the RACH message is transmitted in the transmission time interval (TTI) of every 2 ms.

2. The method of claim 1 , wherein the periodically checking step is performed by monitoring a control channel.

3. The method of claim 2 , wherein the monitoring of the control channel is performed by periodically receiving the control channel.

4. The method of claim 1 , wherein at least one RACH message is transmitted after the request is received.

5. The method of claim 1 , wherein the channel quality information is transmitted periodically for certain time period after the request is received.

6. The method of claim 1 , wherein the request is transmitted from the network through first layer signaling via a physical control channel.

7. The method of claim 1 , wherein the request is included in a header or payload of a MAC PDU generated in a MAC layer.

8. A method of receiving channel quality information (CQI) in a mobile communications system, the method comprising:

transmitting, to a mobile terminal, a request for reporting the channel quality information when the channel quality information is temporarily needed:

wherein the request is transmitted through a High Speed-Shared Control Channel (HS-SCCH),

wherein an identifier of a corresponding terminal is also transmitted to the mobile terminal through the HS-SCCH, and

wherein the identifier of the corresponding terminal is a HS-DSCH Radio Network Temporary Identifier (H-RNTI); and

receiving the channel quality information from the mobile terminal,

wherein the channel quality information is received from the mobile terminal through a random access channel (RACH) procedure,

wherein the channel quality information is included in a medium access control protocol data unit (MAC PDU) of a RACH message,

wherein the MAC PDU including the CQI is received from the mobile terminal through a High Speed-Downlink Shared Channel (HS-DSCH),

wherein a format of the MAC PDU received through the HS-DSCH is determined by the H-RNTI transmitted through the HS-SCCH, and

wherein the RACH message is received in a transmission time interval (TTI) of every 2 ms

wherein the MAC PDU comprises: a TCTF (Type Channel Type Field) which used to indicate a type of logical channel;

a terminal ID to identify a channel quality measurement terminal; and an indicator in a preamble of the MAC PDU to indicate the RACH message is transmitted in the transmission time interval (TTI) of every 2 ms.

9. The method of claim 8 , wherein the received channel quality information is used to support high speed packet access procedures.

10. The method of claim 8 , wherein the request is included in a header or payload of a MAC PDU generated in a MAC layer.

11. A mobile terminal for transmitting channel quality information (CQI), the mobile terminal comprising:

a radio protocol adapted to periodically check whether a request for reporting the channel quality information is received from a network,

wherein the request is received through a High Speed-Shared Control Channel (HS-SCCH),

wherein an identifier of a corresponding terminal is also received from the network through the HS-SCCH,

wherein the identifier of the corresponding terminal is a HS-DSCH Radio Network Temporary Identifier (H-RNTI)

wherein the request is transmitted from the network for a report of channel quality, and to transmit the channel quality information to the network after the request is received,

wherein the channel quality information is transmitted to the network through a random access channel (RACH) procedure,

wherein the channel quality information is included in a medium access control protocol data unit (MAC PDU) of a RACH message,

wherein the MAC PDU including the CQI is transmitted to the network through a High Speed-Downlink Shared Channel (HS-DSCH),

wherein a format of the MAC PDU transmitted through the HS-DSCH is determined by the H-RNTI received through the HS-SCCH, and

wherein the RACH message is transmitted in a transmission time interval (TTI) of every 2 ms

wherein the MAC PDU comprises: a TCTF (Type Channel Type Field) which used to indicate a type of logical channel; a terminal ID to identify a channel quality measurement terminal; and an indicator in a preamble of the MAC PDU to indicate the RACH message is transmitted in the transmission time interval (TTI) of every 2 ms.