Method for sending rlc pdu and allocating radio resource in mobile communications system and rlc entity of mobile communications

A method for allocating resources for transmission in a mobile communications system, comprising:

• allocating the resources such that all logical channels are served in a decreasing priority order up to the size of each radio link control (RLC) STATUS protocol data unit (PDU) waiting for transmission;
• if nay resources remain, allocating such remaining resources such that all the logical channels are served in a decreasing priority order up to their configured prioritized bit rate (PBR);
• and
• if any resources remain, allocating such remaining resources such that all the logical channels are served in a strictly decreasing priority order.

A radio link control (RLC) entity in a mobile communications system comprising a module configured to:

• receive an indication of resource from a medium access control (MAC) entity;
• check whether there is a STATUS PDU is scheduled to be sent to a peer RLC entity;
• compare the size of the indicated resource with the size of the STATUS PDU to be sent;
• primarily allocate the resource to the STATUS PDU so as to send the STATUS PDU to the peer RLC entity if the resource is larger than or equal to the STATUS PDU according to the comparison result;
• and
• skip the transmission of the STATUS PDU if the resource is smaller than the STATUS PDU according to the comparison result.