MBMS Transport Block Timing Synchronization via Temporal Offset
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Solution Overview
Problem
In conventional multimedia broadcast/multicast service (MBMS) systems, user equipment (UE) struggles to determine the transmission start timing of MBMS transport blocks, leading to inefficient soft combining and potential delays, which waste channel resources.
Innovation Solution
The method involves receiving control information with a temporal offset from a service radio network controller, allowing the UE to synchronize with neighboring cells and initiate MBMS transport block transmission at specific timing points not corresponding to a multiple of frames, enabling efficient soft combining by determining a connection frame number (CFN) using this offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE uses conventional timing synchronization methods, then the transmission timing determination is simple, but the soft combining efficiency is poor and transmission delays occur
Solution Approach 1:
The network side pre-configures temporal offset information in system information or RRC signaling, allowing the UE to determine transmission timing in advance without complex real-time calculations, thus improving soft combining efficiency while maintaining simple UE implementation
Solution Approach 2:
The patent introduces temporal offset information as an intermediary parameter that bridges the network's transmission timing and the UE's reception timing, enabling accurate synchronization without requiring complex timing determination mechanisms at the UE side
2Loss of energy
If the UE waits for standard frame boundaries to receive MBMS transport blocks, then the timing synchronization is straightforward, but channel resources are wasted due to delays
Solution Approach 1:
The patent changes the transmission timing parameter from fixed frame boundaries to flexible timing points determined by temporal offsets, allowing MBMS transport blocks to be transmitted immediately when data is ready, thus reducing channel resource waste while maintaining precise timing through network-controlled offset values
3Loss of time
If the UE receives MBMS transport blocks without temporal offset information, then the reception process is simple, but transmission delays occur and soft combining is inefficient
Solution Approach 1:
The network side performs preliminary configuration by providing temporal offset information through system information or RRC signaling before MBMS data transmission, enabling the UE to calculate accurate reception timing in advance and eliminate transmission delays without adding complex real-time processing requirements
Data Source
AI summary
An apparatus and method for transmitting/receiving multimedia broadcast/multicast service (MBMS) transport blocks is disclosed, whereby the MBMS transport blocks can be efficiently received by a user equipment (UE). The present invention enables a UE to determine information related to a transmission start timing point of an MBMS transport block, thereby increasing efficiency of soft combining.