System and method for retransmitting uplink data in a code division multiple access communication system

Abstract

A CDMA communication system includes a Node B, a UE in a region of the Node B, a neighbor Node B being adjacent to the Node B and having a soft handover region where the neighbor Node B overlaps with the Node B, and an RNC connected to the Node B and the neighbor Node B. When the UE exists in a non-soft handover region in a region of the Node B, it transmits uplink data to the Node B for a predetermined first transmission time interval. When the UE exists in the soft handover region, it transmits the uplink data to the Node B and the neighbor Node B for a predetermined second transmission time interval.

1 . A method for transmitting data in a code division multiple access (CDMA) communication system, the method comprising the steps of: 
 transmitting the data for a transmission time interval of a first length, if a user equipment (UE) is located in a non-soft handover region; and    transmitting the data for a transmission time interval of a second length, if the UE is located in a soft handover region.    
   
   
       2 . The method of  claim 1 , wherein the transmission time interval of the second length is longer than the transmission time interval of the first length.  
   
   
       3 . The method of  claim 1 , wherein the transmission time interval of the second length is 10 ms and the transmission time interval of the first length is 2 ms.  
   
   
       4 . The method of  claim 1 , wherein the transmission time interval of the second length and the transmission time interval of the first length are applied to an enhanced uplink dedicated channel (EUDCH) service.  
   
   
       5 . A method for transmitting data in a code division multiple access (CDMA) communication system in which a Node B includes a plurality of cells, the method comprising the steps of: 
 transmitting the data for a transmission time interval of a first length, if a user equipment (UE) is located in a softer handover region between the plurality of cells belonging to the Node B; and    transmitting the data for a transmission time interval of a second length, if the UE is located in a soft handover region.    
   
   
       6 . The method of  claim 5 , wherein the transmission time interval of the second length is longer than the transmission time interval of the first length.  
   
   
       7 . The method of  claim 5 , wherein the transmission time interval of the second length is 10 ms and the transmission time interval of the first length is 2 ms.  
   
   
       8 . The method of  claim 5 , wherein the transmission time interval of the second length and the transmission time interval of the first length are applied to an enhanced uplink dedicated channel (EUDCH) service.  
   
   
       9 . An apparatus for transmitting data in a code division multiple access (CDMA) communication system in which a Node B includes a plurality of cells, the apparatus comprising: 
 a user equipment (UE) for transmitting the data for a transmission time interval of a first length, if the UE is located in a softer handover region, and transmitting the data for a transmission time interval of a second length, if the UE is located in a soft handover region; and    a Node B including a plurality of cells serving the UE.    
   
   
       10 . The apparatus of  claim 9 , wherein the transmission time interval of the second length is longer than the transmission time interval of the first length.  
   
   
       11 . An apparatus for transmitting data in a code division multiple access (CDMA) communication system in which a Node B includes a plurality of cells, the apparatus comprising: 
 a user equipment (UE) for transmitting the data for a transmission time interval of a second length, if the UE is located in a soft handover region, and transmitting the data for a transmission time interval of a first length, if the UE is located in a non-soft handover region;    a plurality of Node Bs serving the UE; and    a radio network controller (RNC) for controlling the plurality of Node Bs.    
   
   
       12 . The apparatus of  claim 11 , wherein the transmission time interval of the second length is longer than the transmission time interval of the first length.  
   
   
       13 . A method for transmitting data in a code division multiple access (CDMA) communication system in which a Node B includes a plurality of cells, the method comprising the steps of: 
 determining acknowledgement (ACK)/negative acknowledgment (NACK) information for data transmitted by a user equipment (UE), if the UE is located in one of a non-soft handover region and a softer handover region;    transmitting the determined ACK/NACK information to the Node B;    upon detecting that the UE is located in a soft handover region, determining ACK/NACK information for the data transmitted by the UE and transmitting the determined ACK/NACK information to a radio network controller (RNC);    after transmitting the determined ACK/NACK information, receiving final ACK/NACK information for the data transmitted by the UE, from the RNC; and    transmitting the final ACK/NACK information received from the RNC, to the UE.    
   
   
       14 . An apparatus for transmitting data in a code division multiple access (CDMA) communication system in which a Node B includes a plurality of cells, the apparatus comprising: 
 a user equipment (UE) for transmitting data to the Node B;    a plurality of Node Bs for determining acknowledgement (ACK)/negative acknowledgment (NACK) information for data transmitted by the UE, if the UE is located in one of a non-soft handover region and a softer handover region, transmitting the determined ACK/NACK information to the UE, determining ACK/NACK information for the data transmitted by the UE, upon detecting that the UE is located in a soft handover region, and transmitting the determined ACK/NACK information; and    a radio network controller (RNC) for receiving the ACK/NACK information transmitted by the Node Bs, generating final ACK/NACK information for the data, and transmitting the final ACK/NACK information to the UE through the plurality of Node Bs.