Method and apparatus for controlling a reverse traffic rate in a mobile communication system

Abstract

A method and apparatus for controlling an uplink data rate in a mobile station of a mobile communication system. The apparatus includes a receiver for receiving control information based on uplink data transmitted in a first transmission interval, a controller for determining an adjusted data rate for uplink data to be transmitted in a second transmission interval, the adjusted data rate being determined based on the received control information and a data rate of the uplink data in the first transmission interval, and a transmitter for transmitting the uplink data in the second transmission interval according to the adjusted data rate. The first transmission interval and the second transmission interval are separated by at least one transmission interval.

1 . A method for controlling an uplink data rate in a mobile station of a mobile communication system, the method comprising:
 transmitting uplink data in a first transmission interval;   receiving control information based on the transmitted uplink data;   determining an adjusted data rate for uplink data to be transmitted in a second transmission interval, the adjusted data rate being determined based on the received control information and a data rate of the uplink data in the first transmission interval; and   transmitting the uplink data in the second transmission interval according to the adjusted data rate,   wherein the first transmission interval and the second transmission interval are separated by at least one transmission interval.   
   
   
       2 . The method of  claim 1 , wherein the control information indicates whether to increase, decrease, or maintain a current data rate. 
   
   
       3 . The method of  claim 1 , wherein the control information is based on a data rate for the first transmission interval that occurs a rate control delay ahead of a current transmission interval. 
   
   
       4 . The method of  claim 3 , wherein the rate control delay is a time required for the mobile station to transmit the uplink data, receive the control information based on the transmitted uplink data, and apply the received control information to the data rate corresponding to the received control information. 
   
   
       5 . The method of  claim 1 , wherein the control information includes a Rate Control Bit (RCB). 
   
   
       6 . The method of  claim 1 , wherein the control information is received through a Forward Rate Control CHannel (F-RCCH). 
   
   
       7 . The method of  claim 1 , wherein the uplink data to be transmitted in the second transmission interval is transmitted over a Reverse Packet Data CHannel (R-PDCH). 
   
   
       8 . The method of  claim 1 , wherein the transmission interval includes a frame, a slot, or a Transmission Time Interval (TTI). 
   
   
       9 . A method for controlling an uplink data rate in a mobile station of a mobile communication system, the method comprising:
 transmitting uplink data in a first transmission interval;   receiving an acknowledgement or non-acknowledgement from a base station, indicating whether reception of the uplink data by the base station is successful;   if the reception of the uplink data is successful, receiving control information based on the transmitted uplink data;   determining an adjusted data rate for uplink data to be transmitted in a second transmission interval, the adjusted data rate being determined based on the received control information and a data rate of the uplink data in the first transmission interval; and   transmitting the uplink data in the second transmission interval according to the adjusted data rate,   wherein the first transmission interval and the second transmission interval are separated by at least one transmission interval.   
   
   
       10 . The method of  claim 9 , further comprising retransmitting the uplink data of the first transmission interval, if the reception of the uplink data is unsuccessful. 
   
   
       11 . The method of  claim 10 , wherein the retransmitted uplink data is combined, by the base station, with uplink data previously transmitted by the mobile station, so that the retransmitted uplink data is lower in energy than the previously transmitted uplink data. 
   
   
       12 . The method of  claim 9 , wherein the control information indicates whether to increase, decrease, or maintain a current data rate. 
   
   
       13 . The method of  claim 9 , wherein the control information includes a rate control bit. 
   
   
       14 . The method of  claim 9 , wherein the control information is based on a data rate for the first transmission interval that occurs a rate control delay ahead of the second transmission interval. 
   
   
       15 . The method of  claim 14 , wherein the rate control delay is a time required for the mobile station to transmit the uplink data, receive the control information based on the transmitted the uplink data, and apply the received control information to the data rate corresponding to the received control information. 
   
   
       16 . An apparatus for controlling a data rate of uplink data in a mobile station of a mobile communication system, comprising:
 a receiver for receiving control information based on uplink data transmitted in a first transmission interval;   a controller for determining an adjusted data rate for uplink data to be transmitted in a second transmission interval, the adjusted data rate being determined based on the received control information and a data rate of the uplink data in the first transmission interval; and   a transmitter for transmitting the uplink data in the second transmission interval according to the adjusted data rate,   wherein the first transmission interval and the second transmission interval are separated by at least one transmission interval.   
   
   
       17 . The apparatus of  claim 16 , wherein the control information indicates whether to increase, decrease, or maintain a current data rate. 
   
   
       18 . The apparatus of  claim 16 , wherein the control information comprises a rate control bit. 
   
   
       19 . The apparatus of  claim 16 , wherein the control information is based on a data rate for the first transmission interval that occurs a rate control delay ahead of the second transmission interval. 
   
   
       20 . The apparatus of  claim 19 , wherein the rate control delay comprises a time required for the mobile station to transmit the uplink data, receive the control information based on the transmitted uplink data, and apply the received control information to the data rate corresponding to the received control information. 
   
   
       21 . The apparatus of  claim 16 , wherein the control information is received through a Forward Rate Control CHannel (F-RCCH). 
   
   
       22 . The apparatus of  claim 16 , wherein the uplink data to be transmitted in the second transmission interval is transmitted over a Reverse Packet Data CHannel (R-PDCH).