Header Decompression Context Resumption in MBMS Cell Handover
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Solution Overview
Problem
In multimedia broadcast/multicast service systems, user equipment experiences inefficiencies when reestablishing a header decompressor connection due to movement between cells, leading to delayed header decompression and inefficient use of radio resources.
Innovation Solution
A method is introduced to rapidly resume header decompression by reusing the context of an old PDCP entity, involving the copying and updating of old header decompression context information using IR-DYN packets, and establishing a new header decompression context before a new radio bearer is formed, minimizing operational requirements for user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new PDCP entity is established when user equipment moves between cells, then the header decompression can be reinitialized, but the service interruption time increases and radio resources are wasted
Solution Approach 1:
The patent applies preliminary action by having the user equipment copy and store the old header decompression context information before moving to a new cell. This pre-prepared context allows the equipment to rapidly resume header decompression without waiting for new context establishment from the network, thereby reducing service interruption time while maintaining decompression reliability
Solution Approach 2:
The patent implements copying by creating a copy of the old PDCP entity's header decompression context information and storing it in the user equipment. This copied context serves as a temporary replacement that enables continuous header decompression during the transition between cells, eliminating the need to wait for new context establishment and thus reducing service interruption
2Manufacturing precision
If header decompression is reinitialized upon PDCP entity change, then the decompression accuracy is maintained, but the operational complexity for user equipment increases
Solution Approach 1:
The patent applies self-service by enabling the user equipment to autonomously copy and store its own old header decompression context information without requiring network coordination or additional signaling. This self-managed context preservation simplifies the operation for the user equipment while ensuring decompression accuracy is maintained through the copied context
3Reliability
If the user equipment waits for header information to reestablish the header decompressor, then the decompression context is properly established, but the service continuity is degraded
Solution Approach 1:
The patent resolves this contradiction by performing preliminary action - the user equipment copies and stores the old header decompression context information before the PDCP entity change occurs. This pre-prepared context eliminates the need to wait for new header information from the network, allowing immediate resumption of header decompression and maintaining service continuity while ensuring proper context establishment
Data Source
AI summary
Disclosed is a method for resuming header decompression by receiving multimedia broadcast/multicast service (MBMS) packet data having compressed headers in a mobile communication system providing the MBMS. The method includes the steps of detecting a moving of user equipment (UE) receiving the MBMS into a new cell from an old cell, copying and storing old header decompression context information used in the old cell, initializing a dynamic part to decompress headers of packet data for the MBMS and waiting for an IR-DYN packet until the IR-DYN packet has been received in the UE, in order to update the old header decompression information, creating a new header decompression context through updating the old header decompression information by using the IR-DYN packet when the IR-DYN packet has been received in the UE, and decompressing the headers of the packet data for the MBMS transmitted from the new cell by using the new header decompression context.