Patent ID: 11877184
Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A network device, wherein the network device is used a target network device, comprising a Packet Data Convergence Protocol (PDCP) entity,
wherein when a terminal device is switched from a source network device to the target network device, a connection between the terminal device and the source network device and a connection between the terminal device and the target network device are both maintained;
the target network device further comprises a memory and a processor, wherein the processor is configured to execute instructions stored in the memory to perform following operations comprising:
after sending a message 4 of a random access procedure to the terminal device, receiving a PDCP protocol data unit (PDU) by using a new secret key and a new robust header compression (RoHC) in response to a determination that (1) the terminal device has received a handover command, (2) the terminal device has initiated a random access procedure, or (3) the terminal device has sent a handover completion message,
wherein the new secret key is different from an old secret key, and wherein the new RoHC is different from an old RoHC, and wherein the old secret key and the old RoHC have been used for communication between the terminal device and the source network device.