5MBS Multicast Radio Bearer Continuity Across Cell Reselection
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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 in LTE architectures.
Innovation Solution
Implementing a method and apparatus for 5G multicast and broadcast service (MBS) that includes UE assistance information for cell reselection, group notifications based on 5MBS service continuity requests, and MBS data transmission via specific bearers like multicast radio bearers (MRB) multiplexed with unicast data, utilizing HARQ/ARQ mechanisms, carrier aggregation, and dual connectivity to ensure reliable and efficient 5MBS 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 combines multiple cells into a multicast-broadcast single-frequency network (MBSFN) area where multiple base stations transmit the same multicast data simultaneously on the same frequency. This merging approach eliminates handover interruptions for UEs within the MBSFN area, as they receive continuous transmission from multiple synchronized cells rather than needing to handover between small individual cells.
Solution Approach 2:
The patent implements a unified MBSFN transmission framework that serves multiple cells and multiple UEs simultaneously with a single multicast service configuration. This multi-functional approach allows the same transmission infrastructure to serve both coverage extension and service continuity functions, eliminating the need for separate handover procedures.
2Productivity
If traditional unicast data transmission is used for MBS, then data can be transmitted, but power consumption is high and resource efficiency is poor
Solution Approach 1:
The patent combines multiple UEs' data reception requirements into a single multicast transmission stream. Instead of each UE receiving separate unicast transmissions, the network transmits one copy of the multicast data that all UEs in the group can receive simultaneously, dramatically improving resource efficiency and reducing overall power consumption.
Solution Approach 2:
The multicast radio bearer (MRB) is designed to serve multiple UEs simultaneously with a single transmission configuration. This multi-functional bearer type can deliver data to any number of UEs within the service area without requiring additional transmission resources per UE, thereby improving both resource efficiency and reducing energy consumption.
3Productivity
If multicast radio bearer (MRB) multiplexed with unicast data is used, then resource efficiency improves, but transmission reliability may be compromised
Solution Approach 1:
The patent segments the transmission into different logical channels and applies appropriate reliability mechanisms to each. The MRB carries multicast data with its own HARQ processes, while unicast data uses separate HARQ processes. This segmentation allows independent optimization of reliability for each data type while sharing physical radio resources efficiently.
Solution Approach 2:
The patent introduces separate HARQ entity structures that act as intermediaries between the MRB and unicast data transmissions. These intermediary HARQ entities manage the reliability aspects independently for multicast and unicast traffic, ensuring that multicast reliability requirements are met while still allowing efficient resource multiplexing at the physical layer.
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.