Method of transmitting and receiving radio access information in a wireless mobile communications system

Abstract

In a wireless mobile communications system, a method of transmitting and receiving radio access information that allows a faster and an efficient way of establishing a radio connection between a terminal and a target base station while performing a handover for the terminal to a cell of the target base station. The network transmits in advance, the radio access information and the like, to the terminal so that the terminal can be connected with the target cell in a faster manner which minimizes the total time for the handover process.

The invention claimed is: 
     
       1. A method of transmitting uplink data in a wireless communication system, the method comprising:
 receiving in a terminal from a network, preamble information generated by the network, wherein the preamble information is received via dedicated signaling in downlink,   wherein the received preamble information is either a dedicated preamble or an index of the dedicated preamble, and wherein the preamble information is used for performing a random access channel (RACH) procedure, and   wherein the dedicated preamble is used for a specific terminal;   transmitting from the terminal to the network, the dedicated preamble on a random access channel (RACH) in uplink; uplink   receiving in the terminal, a random access response in response to the transmitted dedicated preamble, wherein the random access response includes at least one of time information for a handover operation, an uplink grant for the handover operation, time information for a downlink data arrival, or a random access preamble identifier; and   transmitting the uplink data to the network using the uplink grant included in the random access response.   
     
     
       2. The method of  claim 1 , wherein the preamble information is a non-contention random access preamble assigned to the specific terminal by the network. 
     
     
       3. The method of  claim 1 , wherein the preamble information is signaled via a handover command generated by a target base station. 
     
     
       4. The method of  claim 1 , wherein the preamble information is signaled via a physical downlink control channel (PDCCH). 
     
     
       5. The method of  claim 1 , wherein the random access response is received on a downlink shared channel (DL-SCH). 
     
     
       6. A mobile terminal for transmitting uplink data in a wireless communication system, the mobile terminal comprising:
 a transceiver configured to transmit or receive the uplink data;   a memory configured to store the uplink data transmitted or received via the transceiver or from an external source; and   a processor cooperating with the transceiver and the memory, the processor configured to:   receive, from a network, preamble information generated by the network, wherein the preamble information is received via dedicated signaling in downlink, wherein the preamble information is used for performing a random access channel (RACH) procedure, wherein the received preamble information is either a dedicated preamble or an index of the dedicated preamble, and wherein the dedicated preamble is used for a specific terminal;
 transmit, to the network, the dedicated preamble on a random access channel (RACH) in uplink; 
 receive a random access response in response to the transmitted dedicated preamble, wherein the random access response includes at least one of time information for a handover operation, an uplink grant for the handover operation, time information for a downlink data arrival, or a random access preamble identifier; and 
 transmit the uplink data to the network using the uplink grant included in the random access response. 
   
     
     
       7. The mobile terminal of  claim 6 , wherein the preamble information is a non-contention random access preamble assigned to the specific terminal by the network. 
     
     
       8. The mobile terminal of  claim 6 , wherein the preamble information is signaled via a handover command generated by a target base station. 
     
     
       9. The mobile terminal of  claim 6 , wherein the preamble information is signaled via a physical downlink control channel (PDCCH). 
     
     
       10. The mobile terminal of  claim 6 , wherein the random access response is received on a downlink shared channel (DL-SCH). 
     
     
       11. A method of transmitting uplink data in a wireless communication system comprising:
 receiving, via signaling in downlink, in a terminal from a source base station after the source base station has determined that a handover should occur to a target base station, information related to a preamble, wherein the information related to the preamble was previously defined in a message sent from the target base station to the source base station,   wherein the received information related to the preamble is used for performing a random access channel (RACH) procedure, and   wherein the information related to the preamble is used by the terminal to avoid a collision while performing a handover by the terminal to the target base station;   transmitting, from the terminal to the target base station, the preamble on a random access channel (RACH) in uplink;   receiving, in the terminal, in response to the transmitted preamble, a random access response for uplink, wherein the random access response includes an uplink grant for the handover; and   transmitting the uplink data to the target base station using the uplink grant included in the random access response.    
     
     
       12. The method of claim 11, further comprising receiving, in the terminal, time and frequency information from the source base station for use in connecting to the target base station.  
     
     
       13. The method of claim 11, further comprising receiving, in the terminal, a handover command message that includes time and frequency information to connect the target base station and the terminal.  
     
     
       14. The method of claim 11, wherein the information related to the preamble originates at least in part at the target base station and includes frequency information and time information.  
     
     
       15. The method of claim 11, wherein the information related to the preamble is signaled via a physical downlink control channel (PDCCH).  
     
     
       16. The method of claim 11, wherein the random access response is received on a downlink shared channel (DL-SCH).  
     
     
       17. The method of claim 11, wherein the uplink data is uplink traffic data.  
     
     
       18. A mobile terminal configured to transmit uplink data in a wireless communication system, the mobile terminal comprising:
 a transceiver configured to transmit the uplink data;   a memory configured to store uplink data; and   a processor cooperating with the transceiver and the memory, the processor configured to:
 receive, at the terminal from a source base station a command that a handover should occur to a target base station, the command including information related to a preamble, wherein the information related to the preamble is received via signaling in downlink via the source base station from the target base station, 
 wherein the received information related to the preamble is used for performing a random access channel (RACH) procedure, and 
 wherein the information related to the preamble is used by the terminal to avoid a collision while performing a handover by the terminal to the target base station; 
 transmit, from the terminal to the target base station the preamble on a random access channel (RACH) in uplink; 
 receive, in the terminal, in response to the transmitted preamble, a random access response for uplink, wherein the random access response includes an uplink grant for the handover; and 
 transmit the uplink data to the target base station using the uplink grant included in the random access response.  
   
     
     
       19. The mobile terminal of claim 18, wherein the processor is further configured to receive, in the terminal, time and frequency information from the source base station for use in connecting to the target base station.  
     
     
       20. The mobile terminal of claim 18, wherein the processor is further configured to receive, in the terminal, a handover command message that includes time and frequency information to connect the target base station and the terminal.  
     
     
       21. The mobile terminal of claim 18, wherein the command includes information from the target base station for establishing a radio connection to the target base station.  
     
     
       22. The mobile terminal of claim 18, wherein the information related to the preamble is signaled via a physical downlink control channel (PDCCH).  
     
     
       23. The system of claim 18, wherein the random access response is received on a downlink shared channel (DL-SCH).  
     
     
       24. A method of performing a handover of a terminal to a target base station in a wireless communication system, the method comprising:
 transmitting, by the terminal, measurement information to a source base station;   receiving, by the terminal, and after the source base station has determined that a handover should occur to the target base station, a handover command message from the source base station, wherein the handover command message includes access information, and the access information includes information related to a preamble as identified by the target base station for use by the terminal during a random access procedure with the target base station, wherein the information related to the preamble is used by the terminal to avoid a collision while performing the handover to the target base station;   establishing, by the terminal, and in response to the handover command message, a radio connection with the target base station, wherein the terminal connects with the target base station during the random access procedure using the preamble; and   transmitting, by the terminal, a handover complete message to the target base station.    
     
     
       25. The method of claim 24, wherein the measurement information is a measurement report including channel conditions.  
     
     
       26. The method of claim 24, wherein the handover command message includes a handover command with a terminal identification, and wherein the target base station determines the terminal identification using the preamble information.  
     
     
       27. The method of claim 24, wherein the handover command message includes time and frequency information for use in connecting the target base station and the terminal.  
     
     
       28. The method of claim 24, further comprising receiving, by the terminal, time and frequency information from the source base station for use in connecting to the target base station.  
     
     
       29. A system comprising:
 a source base station;   a target base station; and   a mobile terminal configured to transmit uplink data in a wireless communication system, the mobile terminal comprising:   a transceiver configured to transmit the uplink data;   a memory configured to store uplink data; and   a processor cooperating with the transceiver and the memory, the processor configured to:
 receive, at the terminal from the source base station, and after the source base station has determined that a handover should occur to the target base station, information related to a preamble, wherein the information related to the preamble is received via signaling in downlink from the target base station, 
 wherein the received information related to the preamble is used for performing a random access channel (RACH) procedure, and 
 wherein the information related to the preamble is used by the terminal to avoid a collision while performing a handover by the terminal to the target base station; 
 transmit, from the terminal to the target base station the preamble on a random access channel (RACH) in uplink; 
 receive, in the terminal, in response to the transmitted preamble, a random access response for uplink, wherein the random access response includes an uplink grant for the handover; and 
 transmit the uplink data to the target base station using the uplink grant included in the random access response.  
   
     
     
       30. The system of claim 29, wherein the processor is further configured to receive, in the terminal, time and frequency information from the source base station for use in connecting to the target base station.  
     
     
       31. The system of claim 29, wherein the processor is further configured to receive, in the terminal, a handover command message that includes time and frequency information to connect the target base station and the terminal.  
     
     
       32. The system of claim 29, wherein the information related to the preamble is signaled via a physical downlink control channel (PDCCH).  
     
     
       33. The system of claim 29, wherein the random access response is received on a downlink shared channel (DL-SCH).  
     
     
       34. The mobile terminal of claim 29, wherein the information related to the preamble originates at least in part at the target base station.