Method and related device of a trigger mechanism of buffer status report and scheduling request in a wireless communication system

Abstract

A method of a trigger mechanism of buffer status report (BSR) and scheduling request (SR) for a MAC layer of a UE in a wireless communication system, including receiving a first data, identifying a state of SPS resource configuration and a type of the first data when the first data arrives at a transmission buffer, deciding a state of a BSR-SR triggering according to the state of SPS resource configuration, the type of the first data and a comparison between a size of a second data in the transmission buffer and a threshold, and after a BSR-SR is triggered, performing at least one of cancelling a pending SR when an uplink grant corresponding to the BSR-SR is enough to transmit total available data in the transmission buffer and remaining the pending SR when an uplink grant corresponding to the BSR-SR is not enough to transmit the total available data.

What is claimed is: 
     
         1 . A method of a trigger mechanism of buffer status report (BSR) and scheduling request (SR) for a medium access control layer of a user equipment in a communication system, the method comprising:
 receiving a first data;   identifying a state of semi-persistent scheduling (SPS) resource configuration and a type of the first data when the first data arrives at a transmission buffer;   deciding a state of a BSR-SR triggering according to the state of SPS resource configuration, the type of the first data, and a comparison between a size of a second data in the transmission buffer and a threshold; and   after a BSR-SR is triggered, performing at least one of:
 cancelling a pending SR when an uplink grant corresponding to the BSR-SR is enough to transmit total available data in the transmission buffer; and 
 remaining the pending SR when an uplink grant corresponding to the BSR-SR is not enough to transmit the total available data in the transmission buffer. 
   
     
     
         2 . The method of  claim 1 , wherein the step of deciding the state of the BSR-SR triggering comprises at least one of the following:
 when SPS resources are not configured and a size of total available data in the transmission buffer is larger than the threshold, triggering the BSR-SR, wherein the total available data is the second data equal to the first data plus the data already existed in transmission buffer; and   when the SPS resources are configured, the first data is SPS data, and a size of accumulated SPS data in the transmission buffer is larger than the threshold, triggering the BSR-SR, wherein the accumulated SPS data is the second data.   
     
     
         3 . The method of  claim 1 , wherein the threshold is set to a value according to a size of at least one uplink grant, a value according to the sum of uplink grants during a time window, or a predetermined value not according to any uplink grant or time window. 
     
     
         4 . The method of  claim 1 , wherein the threshold for a logic channel is set to infinity by not allocating the logical channel to any logical channel group. 
     
     
         5 . A communication device of a wireless communication system for a trigger mechanism of buffer status report (BSR) and scheduling request (SR) for a medium access control layer, the communication device comprising:
 a computer readable recording medium for storing program code corresponding to a process; and   a processor coupled to the computer readable recording medium, for processing the program code to execute the process, wherein the process comprises:
 receiving a first data; 
 identifying a state of semi-persistent scheduling (SPS) resource configuration and a type of the first data when the first data arrives at a transmission buffer; 
 deciding a state of a BSR-SR triggering according to the state of SPS resource configuration, the type of the first data, and a comparison between a size of a second data in the transmission buffer and a threshold; and 
   after a BSR-SR is triggered, performing at least one of:
 cancelling a pending SR when an uplink grant corresponding to the BSR-SR is enough to transmit total available data in the transmission buffer; and 
 remaining the pending SR when an uplink grant corresponding to the BSR-SR is not enough to transmit the total available data in the transmission buffer. 
   
     
     
         6 . The communication device of  claim 5 , wherein the step of deciding the state of the BSR-SR triggering in the process comprises at least one of the following:
 when SPS resources are not configured and a size of total available data in the transmission buffer is larger than the threshold, triggering the BSR-SR, wherein the total available data is the second data equal to the first data plus the data already existed in transmission buffer; and   when the SPS resources are configured, the first data is SPS data, and a size of accumulated SPS data in the transmission buffer is larger than the threshold, triggering the BSR-SR, wherein the accumulated SPS data is the second data.   
     
     
         7 . The communication device of  claim 5 , wherein the threshold is set to a value according to a size of at least one uplink grant, a value according to the sum of uplink grants during a time window, or a predetermined value not according to any uplink grant or time window. 
     
     
         8 . The communication device of  claim 5 , wherein the threshold for a logic channel is set to infinity by not allocating the logical channel to any logical channel group.