Method for transmitting response information in mobile communications system
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.
1. A method for transmitting a specific preamble and receiving information in response to the specific preamble in a mobile communication system, the method comprising:
transmitting the specific preamble over a random access channel (RACH);
receiving response information over a common channel, the response information comprising a plurality of responses and a plurality of identifiers respectively corresponding to the plurality of responses; and
processing a specific response from among the plurality of responses if one of the plurality of identifiers indicates that the specific response corresponds to the specific preamble.
2. The method of claim 1 , further comprising:
transmitting data using radio resources allocated by the specific response if one of the plurality of identifiers indicates that the specific response corresponds to the specific preamble.
3. The method of claim 2 , further comprising:
receiving a first message comprising an indication that the transmitted data was not properly received; and
retransmitting the data using newly allocated radio resources.
4. The method of claim 3 , wherein the first message comprises the newly allocated radio resources.
5. The method of claim 3 , further comprising:
receiving a second message comprising the newly allocated radio resources.
6. The method of claim 1 , wherein the common channel is a downlink shared channel (DL-SCH).
7. A method for receiving a preamble and transmitting information in response to the preamble in a mobile communication system, the method comprising:
receiving a plurality of preambles over a random access channel (RACH);
transmitting response information over a common channel, the response information comprising a plurality of responses corresponding to the plurality of preambles and a plurality of identifiers identifying which of the plurality of responses corresponds to each of the plurality of preambles.
8. The method of claim 7 ,
wherein each of the responses comprises radio resource allocation information, and
wherein the radio resource allocation information is for a transmission of data from a mobile communication terminal.
9. The method of claim 8 , further comprising:
receiving data from the mobile communication terminal via a radio resource corresponding to the radio resource allocation information;
determining that the data was not properly received;
transmitting a first message comprising additional allocated radio resources associated with a retransmission of the data; and
receiving the data retransmitted using the radio resources allocated by the first message.
10. The method of claim 9 ,
wherein the first message further comprises an indication that the data was not properly received.
11. The method of claim 9 , further comprising:
transmitting a second message comprising an indication that the data was not properly received.
12. The method of claim 9 , wherein the common channel is a downlink shared channel (DL-SCH).
13. A method for performing a random access in a mobile communication system, the method comprising:
a plurality of mobile communication terminals transmitting a plurality of preambles over a random access channel (RACH);
a network transmitting response information over a common channel, the response information comprising a plurality of responses corresponding to the plurality of preambles and a plurality of identifiers respectively corresponding to the plurality of responses;
the plurality of mobile communication terminals receiving the response information; and
one of the plurality of mobile communication terminals processing specific response from among the plurality of responses if one of the plurality of identifiers indicates that the specific response corresponds to a preamble transmitted by the one of the plurality of mobile communication terminals.
14. The method of claim 13 ,
wherein each of the responses comprises radio resource allocation information, and
wherein the radio resource allocation information is for each transmission of data from each of the plurality of mobile communication terminals.
15. The method of claim 14 , further comprising:
the one of the plurality of mobile communication terminals transmitting data using the radio resources allocated by the radio resource allocation information if one of the plurality of identifiers indicates that the specific response corresponds to the preamble transmitted by the one of the plurality of mobile communication terminals.
16. The method of claim 15 , further comprising:
the network receiving data from the one of the plurality of mobile communication terminals using the allocated radio resources;
the network determining that the data was not properly received;
the network transmitting a first message comprising additional allocated radio resources associated with a retransmission of the data;
the one of the plurality of mobile communication terminals retransmitting the data using the radio resources allocated by the first message; and
the network receiving the data retransmitted using the radio resources allocated by the first message.
17. The method of claim 16 ,
wherein the first message further comprises an indication that the data was not properly received.
18. The method of claim 16 , further comprising:
the network transmitting a second message comprising an indication that the data was not properly received.
19. The method of claim 13 , wherein the common channel is a downlink shared channel (DL-SCH).
20. The method of claim 1 , wherein the plurality of responses correspond to a plurality of preambles received by a base station during a specific time interval.
21. The method of claim 7 , wherein the plurality of responses are received during a specific time interval.