5MBS Service Continuity via Multiplexed Multicast Radio Bearers
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Solution Overview
Problem
Existing 5G NR multicast and broadcast services (5MBS) suffer from issues such as high power consumption, poor resource efficiency, unreliable transmission, data loss during handovers, and service interruptions due to frequent cell changes in small coverage areas, which are not addressed by current LTE-based solutions.
Innovation Solution
Implementing a method and apparatus for 5MBS that includes UE-assisted information exchange for cell reselection, group notifications based on 5MBS service continuity requests, and MBS data transmission via multiplexed multicast radio bearers with unicast data, utilizing HARQ/ARQ mechanisms, carrier aggregation, and dual connectivity to ensure reliable and efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If single-cell point-to-multipoint (SC-PTM) is used for 5MBS transmission in small coverage areas, then coverage is provided, but frequent handovers and tracking area updates occur causing service interruption and data loss
Solution Approach 1:
The patent merges multiple cells into a multicast-broadcast single-frequency network (MBSFN) area where multiple cells transmit the same multicast data simultaneously. This allows UEs to receive continuous service while moving within the MBSFN area without handover interruptions, resolving the contradiction between providing coverage in small areas and maintaining transmission reliability during mobility.
Solution Approach 2:
The patent implements preliminary configuration of multicast radio bearers (MRBs) and pre-synchronization of multicast data across multiple cells before UEs enter the MBSFN area. This preliminary action ensures that UEs can seamlessly switch between cells without service interruption or data loss, maintaining transmission reliability while providing continuous coverage.
2Adaptability or versatility
If frequent handovers and tracking area updates are performed in small coverage areas, then mobility is supported, but service interruption and data loss occur
Solution Approach 1:
Multiple cells are merged into a single MBSFN area that transmits identical multicast data streams. UEs can move freely within this area without triggering handovers, as all cells provide the same service. This eliminates service interruptions and data loss during mobility while maintaining full mobility support.
Solution Approach 2:
The patent ensures continuous multicast data transmission across all cells in the MBSFN area simultaneously. This continuity of useful action guarantees that UEs receive uninterrupted service during mobility without data loss, while still supporting full mobility within the MBSFN area.
3Reliability
If multicast data is transmitted via dedicated multicast radio bearers, then transmission reliability is improved, but resource efficiency decreases
Solution Approach 1:
The patent makes multicast radio bearers (MRBs) universal by designing them to handle both multicast and unicast traffic. MRBs can dynamically switch between carrying multicast data for multiple UEs and unicast data for individual UEs, improving resource efficiency while maintaining transmission reliability through the use of HARQ and ARQ mechanisms.
Solution Approach 2:
The patent merges multicast and unicast traffic onto the same radio bearers (MRBs). This consolidation allows the system to achieve resource efficiency by sharing radio resources while maintaining transmission reliability through unified error correction mechanisms (HARQ/ARQ) that work effectively for both traffic types.
4Reliability
If 5MBS service continuity mechanisms are implemented, then data loss during handover is reduced, but system complexity increases
Solution Approach 1:
The patent merges multiple cells into a single MBSFN area that operates as one unified service region. This merging eliminates the need for complex handover procedures and tracking area updates, reducing system complexity while ensuring service continuity and preventing data loss during mobility.
Solution Approach 2:
The patent implements continuous multicast data transmission across all cells in the MBSFN area without interruption. This continuity approach simplifies the system by eliminating the need for complex service continuity mechanisms, handover procedures, and data buffering, while still achieving zero data loss during mobility.
Data Source
AI summary
An apparatus and a method of wireless communication for multicast and broadcast service (MBS) are provided. The method for MBS by a user equipment (UE) includes transmitting a UE assistance information to a source cell and/or a target cell for cell reselection, receiving a group notification from the source cell and/or the target cell, wherein the group notification is transmitted based on a 5G multicast and broadcast service (5MBS) service continuity (SC) request and a 5MBS response between the source cell and the target cell, and receiving an MBS data transmission via a specific bearer type from the source cell and/or the target cell based on an MBS reliability requirement, wherein the MBS data transmission is transmitted via a multicast radio bearer (MRB) which is multiplexed with a unicast data.