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