Multi-Connectivity MBMS Transmission Without Synchronization
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Solution Overview
Problem
Conventional Multimedia Broadcast Multicast Service (MBMS) systems require strict synchronization among Base Stations (BSs) for efficient multicast transmission, limiting flexibility and increasing control overhead, as User Equipments (UEs) receive the same content from multiple BSs in synchronization, masking the multipath reception.
Innovation Solution
Implementing multi-connectivity (MC) in MBMS systems, allowing User Equipments (UEs) to receive the same MBMS content from multiple Base Stations on different physical resource blocks, eliminating the need for strict synchronization and enabling independent radio resource allocation by each BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strict synchronization is implemented among Base Stations for MBMS transmission, then the UE can receive content from multiple BSs in MBSFN mode with better SNR, but the flexibility of MBSFN operations is limited and control overhead increases
Solution Approach 1:
The patent segments the synchronized transmission approach into independent multi-connectivity sessions. Instead of requiring all BSs to transmit synchronously on the same resources, each BS independently transmits MBMS content on different resource blocks, and the UE separately processes each transmission. This segmentation eliminates the strict synchronization requirement while maintaining the benefit of receiving content from multiple BSs.
Solution Approach 2:
The patent introduces a new dimension of operation by allowing MBMS transmissions on different resource blocks (frequency dimension) rather than the same resources. This dimensional change enables BSs to transmit independently without synchronization while still delivering the same content to the UE, thereby resolving the contradiction between reliability and flexibility.
2Reliability
If strict synchronization is implemented among Base Stations for MBMS transmission, then the UE can receive content from multiple BSs in MBSFN mode, but a large control overhead is required to coordinate between the BSs
Solution Approach 1:
Each Base Station independently manages its own MBMS transmission without requiring coordination with other BSs. The UE autonomously selects and receives content from multiple BSs on different resource blocks without centralized control. This self-service approach eliminates the large control overhead associated with strict synchronization while maintaining reliable content delivery.
3Reliability
If MBMS content is transmitted on the same resources by multiple eNBs in MBSFN mode, then the UE receives better SNR, but the requirement of strict synchronization limits flexibility and increases control overhead
Solution Approach 1:
The patent applies local quality by allowing each Base Station to independently allocate resources for MBMS transmissions according to local conditions. Each eNB can select different resource blocks suitable for its specific situation, and the UE receives content from multiple sources with potentially different resource allocations. This approach maintains flexibility in resource allocation while still achieving reliable content delivery through multi-connectivity.
Data Source
AI summary
Methods and systems for using multi-connectivity for multicast transmissions in a communication system. A method disclosed herein includes using multi-connectivity that enables at least one User Equipment (UE) to receive at least one Multimedia Broadcast Multicast Service (MBMS) content from the plurality of BSs at a time on different physical resource blocks. The method further includes enabling the plurality of BSs to maintain independent MBMS sessions for transmitting the at least one MBMS content to the at least one UE without synchronization. The method further includes enabling the at least one UE to combine the at least one MBMS content received from the plurality of BSs or to select a MBMS content from the received at least one MBMS content.