Method And Apparatus For Handling Packet Data Convergence Protocol Duplication In Mobile Communications

Abstract

Various solutions for handling packet data convergence protocol (PDCP) duplication with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether a PDCP entity is associated with two radio link control (RLC) entities. The apparatus may determine whether PDCP duplication is activated. The apparatus may select one of the two RLC entities to transmit a PDCP control protocol data unit (PDU) in an event that the PDCP entity is associated with the two RLC entities and the PDCP duplication is activated.

What is claimed is: 
     
         1 . A method, comprising:
 determining, by a processor of an apparatus, whether packet data convergence protocol (PDCP) duplication is activated;   adding, by the processor, a sequence number to a first PDCP control protocol data unit (PDU) in an event that the PDCP duplication is activated; and   transmitting, by the processor, the first PDCP control PDU.   
     
     
         2 . The method of  claim 1 , wherein the first PDCP control PDU comprises a PDCP status report or an interspersed robust header compression (ROHC) feedback. 
     
     
         3 . The method of  claim 1 , further comprising:
 receiving, by the processor, a second PDCP control PDU;   determining, by the processor, whether the second PDCP control PDU is a duplicate PDU according to a sequence number of the second PDCP control PDU; and   discarding, by the processor, the second PDCP control PDU in an event that the second PDCP control PDU is the duplicate PDU.   
     
     
         4 . An apparatus, comprising:
 a transceiver capable of wirelessly communicating with a network node of a wireless network; and   a processor communicatively coupled to the transceiver, the processor capable of:
 determining whether packet data convergence protocol (PDCP) duplication is activated; 
 adding a sequence number to a first PDCP control protocol data unit (PDU) in an event that the PDCP duplication is activated; and 
 transmitting, via the transceiver, the first PDCP control PDU. 
   
     
     
         5 . The apparatus of  claim 4 , wherein the first PDCP control PDU comprises a PDCP status report, or an interspersed robust header compression (ROHC) feedback. 
     
     
         6 . The apparatus of  claim 4 , wherein the processor is further capable of:
 receiving, via the transceiver, a second PDCP control PDU;   determining whether the second PDCP control PDU is a duplicate PDU according to a sequence number of the second PDCP control PDU; and   discarding the second PDCP control PDU in an event that the second PDCP control PDU is the duplicate PDU.