Method and Apparatus of a Procedure for Receiving Window Size Reconfiguration in a Communication System

Abstract

A method for reconfiguring receiving window size of a receiving end of a communication system in a transmitting end of the communication system includes receiving a status report unit from the receiving end and updating an acknowledge state variable and a maximum send state variable according to the status report unit. Positively acknowledged packets with sequence numbers greater than the acknowledge state variable are retained in a buffer of the transmitting end. Positively acknowledged packets with sequence numbers greater than the acknowledge state variable are marked by the transmitter end as positively acknowledged packets. The maximum send state variable is updated according to a command for reconfiguring receiving window size of the communication system. Positively acknowledged packets with sequence numbers greater than or equal to the maximum send state variable are marked as not yet acknowledged packets.

1 . A method of processing reconfiguration of a receiving window size of a receiver in a transmitter of a communications system, the method comprising: 
 receiving a status report unit from the receiver;    updating a first parameter indicating a sequence number following a sequence number of a last in-sequence acknowledged packet and a second parameter indicating a sequence number following a sequence number of a last packet within a transmitting window according to the status report unit;    retaining packets that have been positively acknowledged according to the status report unit and have sequence numbers larger than the first parameter in a buffer of the transmitter;    marking packets that have been positively acknowledged according to the status report unit and have sequence numbers larger than the first parameter as positively acknowledged packets;    updating the second parameter according to a command for reconfiguring the receiving window size of the communications system; and    marking packets with sequence numbers larger than or equal to the updated second parameter as not yet acknowledged packets.    
   
   
       2 . The method of  claim 1  further comprising initiating a retransmission procedure for retransmitting negatively acknowledged packets according to the status report unit.  
   
   
       3 . The method of  claim 2  wherein the retransmission procedure retransmits a negatively acknowledged packet for a predetermined number of times.  
   
   
       4 . The method of  claim 3  wherein the predetermined number of times is 1.  
   
   
       5 . The method of  claim 1  wherein the communications system is a 3 rd  generation mobile communications system.  
   
   
       6 . The method of  claim 1  wherein the communications system is operating in an acknowledged mode.  
   
   
       7 . A wireless device comprising a central processing unit in electrical communications with a memory, the memory comprising program code for implementing the method of  claim 1.