MBMS Data Radio Bearer Mapping for PDCP Feedback Reliability
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Solution Overview
Problem
Current MBMS transmission lacks a packet data convergence protocol (PDCP) layer, preventing feedback on data packet reception and thus lacking a retransmission mechanism, and simultaneous transmission of multicast and unicast is required for enhanced performance.
Innovation Solution
Introduce a PDCP layer for MBMS transmission, configuring a data radio bearer (DRB) for unicast transmission associated with a multicast service, enabling feedback and retransmission of data packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PDCP layer is introduced for MBMS transmission, then reliability of data transmission is improved through feedback and retransmission mechanisms, but device complexity increases due to additional protocol layer configuration
Solution Approach 1:
The patent introduces a PDCP layer as an intermediary protocol layer between the RLC and IP layers specifically for MBMS transmission. This mediator enables feedback mechanisms and retransmission capabilities by establishing a structured communication path that allows acknowledgment messages to flow from terminal devices to the network device, thereby improving reliability without disrupting the existing MBMS architecture.
Solution Approach 2:
The patent segments the MBMS transmission protocol stack by introducing a dedicated PDCP layer configuration. This segmentation allows the system to apply different protocol treatments to MBMS traffic versus traditional unicast traffic, enabling selective implementation of feedback and retransmission mechanisms only where needed for MBMS, thus managing complexity through structured division of protocol functions.
2Reliability
If simultaneous multicast and unicast transmission is enabled, then service quality is improved through diverse transmission paths, but system complexity increases due to multiple transmission modes
Solution Approach 1:
The patent implements a universal configuration framework where the PDCP layer can serve multiple functions: it handles both traditional unicast traffic and MBMS multicast traffic through a single protocol structure. The configuration parameters and feedback mechanisms are designed to be multi-functional, allowing the same infrastructure to support diverse transmission modes (multicast and unicast simultaneously) without requiring completely separate processing paths, thereby reducing overall system complexity.
Solution Approach 2:
The patent introduces dynamic transmission mode selection capabilities where the system can adaptively switch between multicast and unicast transmission modes based on service requirements and network conditions. The PDCP layer configuration enables dynamic adjustment of feedback mechanisms and retransmission parameters, allowing the system to optimize performance for different service types while managing complexity through flexible, condition-based transmission management.
Data Source
AI summary
Embodiments of the present disclosure relate to method, device and computer readable medium of communication. The method comprises determining, at a network device, a data radio bearer associated with a multicast service; and transmitting, to a terminal device, first information comprising an identity of the multicast service and an identity of the data radio bearer. The method further comprises receiving, at the terminal device, the first information from the network device; and performing a communication between the terminal device and the network device based on the first information. In this way, simultaneous transmission of multicast and unicast for a MBMS can be achieved and reliability of the MBMS can be enhanced.