Multicast Radio Bearer Configuration for Reliable MBS
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring reliable multicast transmission, particularly in scenarios requiring robust group communication and public safety networks, where traditional multicast methods do not guarantee successful reception for all users without degrading resource efficiency.
Innovation Solution
The implementation of a UE MRB configuration, establishment, reconfiguration, and release procedure that enables feedback for multicast services, using PDCP-based, RLC-based, or MAC-based retransmissions, allowing the network to perform necessary retransmissions and improve transmission reliability by associating MRBs with multicast and unicast channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multicast methods are used for content delivery to large mobile user groups, then resource efficiency is maintained, but reception reliability and quality are not guaranteed for all users
Solution Approach 1:
The patent segments the multicast reception process into multiple phases: initial multicast transmission, feedback collection from UEs, and selective retransmission. This segmentation allows the system to maintain efficient multicast delivery for successful receptions while providing targeted unicast retransmissions only for failed packets, thus resolving the contradiction between reliability and resource efficiency.
Solution Approach 2:
The patent implements a feedback mechanism where UEs send reception status information back to the network. This feedback enables the network to identify which multicast packets were not successfully received and triggers selective unicast retransmissions only for those specific packets, maintaining resource efficiency while improving reception reliability.
2Reliability
If feedback mechanisms are added to multicast transmission to enable retransmissions, then reception quality improves, but system complexity increases
Solution Approach 1:
The patent dynamically adjusts the reception mode for each UE based on real-time conditions. The network can switch between pure multicast, multicast with selective retransmission, and pure unicast modes depending on UE mobility, channel conditions, and service requirements. This dynamic adaptation reduces unnecessary complexity while maintaining reliability where needed.
Solution Approach 2:
The patent applies different quality levels of service to different UEs or different packets. Highly mobile UEs or those in poor channel conditions receive enhanced service with unicast retransmissions, while stationary UEs with good reception rely on standard multicast. This localized quality adjustment reduces overall system complexity by applying complexity only where necessary.
3Reliability
If unicast retransmissions are implemented for multicast services, then reception quality for mobile users improves, but resource consumption increases
Solution Approach 1:
The patent applies unicast retransmission only partially - specifically for multicast packets that are not successfully received, rather than for all transmissions. This partial application of unicast resources ensures reception quality for mobile users only when necessary, avoiding excessive resource consumption during successful multicast deliveries.
Data Source
AI summary
Apparatus and methods are provided for the UE MRB configuration, establishment, reconfiguration, and release procedure for reliable MBS. In one novel aspect, the UE performs MRB establishment, release, reconfiguration based on one or more activation, release, and reconfiguration conditions, respectively. In one embodiment, the UE configures a multicast radio bearer (MRB) for one or more MBSs with enabled feedback for the one or more MBSs. The UE establishes an MRB and a UE protocol stack for an active MRB based on the MRB configuration upon detecting one or more activation conditions, wherein the MRB is associated with one or two channels comprising a multicast channel and a unicast channel. In one embodiment, the feedback and retransmission are PDCP-based, with one PDCP entity and one or two RLC entities associated with two logical channels MTCH and DTCH, respectively, for the MRB.