Method for improving buffer status triggering mechanism in wireless communications system and related communication device

A communication device of a wireless communication system for improving a buffer status triggering mechanism of a communications layer, the communication device comprising:

• a computer readable recording medium for storing program code corresponding to a process;
• a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
• wherein the process comprises:
• receiving an indication indicating that uplink data becomes data available for transmission in an upper layer of the communications layer;
• when data available for transmission other than the uplink data is included in a transmission buffer of the upper layer, determining whether a logical channel corresponding to any data of the uplink data has higher priority than logical channels corresponding to the data available for transmission in the transmission buffer;
• and
• when the logical channel corresponding to any data of the uplink data has higher priority than the logical channels corresponding to the data available for transmission in the transmission buffer, triggering a buffer status report.

A communication device of a wireless communication system for improving a buffer status triggering mechanism where a buffer status report is triggered, 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:
• triggering a scheduling request corresponding to the buffer status report when the communication device has no uplink resources allocated for a new transmission and has uplink data becoming data available for transmission.

A method for improving a buffer status triggering mechanism for a mobile device of a wireless communication system, the method comprising:

• triggering a buffer status report corresponding to a packet of a first communications layer when the packet of the first communications layer becomes data available for transmission in the first communications layer;
• when the packet of the first communications layer is transmitted to a second communications layer, determining whether a buffer of the second communications layer includes data whose priority is higher than the packet of the first communications layer;
• and
• when the buffer of the second communications layer does not include any data whose priority is higher than the packet of the first communications layer, determining that the packet of the first communications layer is not data available for transmission in the second communications layer.

A communication device of a wireless communication system for improving a buffer status triggering mechanism, the communication device comprising:

• a computer readable recording medium for storing program code corresponding to a process;
• a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
• wherein the process comprises:
• triggering a buffer status report corresponding to a packet of a first communications layer when the packet of the first communications layer becomes data available for transmission in the first communications layer;
• when the packet of the first communications layer is transmitted to a second communications layer, determining whether a buffer of the second communications layer includes data whose priority is higher than the packet of the first communications layer;
• and
• when the buffer of the second communications layer does not include any data whose priority is higher than the packet of the first communications layer, determining that the packet of the first communications layer is not data available for transmission in the second communications layer.

A communication device of a wireless communication system for improving a buffer status triggering mechanism, the communication device comprising:

• a computer readable recording medium for storing program code corresponding to a process;
• a processor coupled to the computer readable recording medium, for processing the storage data to execute the process;
• wherein the process comprises:
• initiating an radio resource control, hereinafter called RRC, connection re-establishment procedure;
• and
• when an RRC connection re-establishment complete message of the RRC connection re-establishment procedure needs to be transmitted, triggering a buffer status report corresponding to the RRC connection re-establishment complete message.

A communication device of a wireless communication system for improving a buffer status triggering mechanism, the communication device comprising:

• a computer readable recording medium for storing program code corresponding to a process;
• a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
• wherein the process comprises:
• triggering a buffer status report for radio bearers other than a signaling radio bearer 1 after the radio bearers other than the signaling radio bearer 1 are resumed.