5G MBS Header Compression for Mid-Session UE Packet Reception
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Solution Overview
Problem
Existing mobile communication systems face challenges in providing seamless multicast broadcast services (MBS) in 5G networks, particularly for UEs joining mid-session, due to issues with header compression and PDCP sequence number alignment, leading to unsuccessful packet reception and processing.
Innovation Solution
The proposed method includes omitting the transmission of static header information during initial header compression, separately transmitting header information via control channels, and configuring PDCP sequence numbers based on the first received packet, while omitting SDAP header addition for MBS packets, and multiplexing logical channels using group RNTI for efficient MBS delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If header compression processing is performed by omitting static header information transmission, then transmission efficiency is improved and overhead is reduced, but UEs joining mid-session cannot successfully receive and process packets due to missing header information
Solution Approach 1:
The base station transmits header information separately before or alongside compressed MBS packets, ensuring that UEs have the necessary header information available before attempting to decompress and process packets. This preliminary provision of header information resolves the contradiction by maintaining both transmission efficiency through compression and reliability through available header data for mid-session joiners.
Solution Approach 2:
A separate header information transmission channel acts as an intermediary between the compressed MBS packet transmission and UE packet processing. This intermediary mechanism delivers the static header information that UEs need to successfully decompress and process packets, solving the reliability issue while preserving the productivity gains from header compression.
2Ease of operation
If PDCP sequence numbers are configured based on first received packet for mid-session UEs, then packet processing alignment is improved, but complexity increases in managing different initial values for different UEs
Solution Approach 1:
Each UE is configured with PDCP initial values locally adapted to its specific join timing and first received packet, rather than using a uniform configuration for all UEs. This local customization approach improves packet processing alignment for each individual UE while the base station manages the complexity through automated configuration based on observed packet reception patterns.
3Measurement precision
If SDAP header removal processing is performed on MBS packets, then processing accuracy is improved, but unnecessary processing overhead is introduced when SDAP headers are not actually present
Solution Approach 1:
The base station provides advance notification to UEs about whether SDAP headers will be present in MBS packets through configuration information or signaling. This preliminary information allows UEs to skip unnecessary SDAP header removal processing when headers are not present, eliminating wasted processing time while maintaining accurate packet handling when headers are actually present.
Data Source
AI summary
A communication control method used in a mobile communication system, the mobile communication system providing a multicast broadcast service (MBS) from a base station to a user equipment, the communication control method including, by the base station, performing header compression processing in which transmission of header information is omitted, the header information being static information included in a header of an MBS packet, and transmitting a compressed MBS packet subjected to the header compression processing, and transmitting, by the base station, after starting transmitting of the compressed MBS packet, the header information separately from the compressed MBS packet.