Multicast Service Continuity in RRC_INACTIVE Cell Reselection
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Solution Overview
Problem
Multicast transmission in 3GPP networks is currently limited to UEs in RRC_CONNECTED state, which is not power efficient and does not fully meet the requirements of services like Mission Critical Services, especially for cells with a large number of UEs, and there is a lack of optimization for simultaneous broadcast and unicast reception, particularly in RRC_INACTIVE state.
Innovation Solution
Supporting multicast reception by UEs in RRC_INACTIVE state through PTM configuration, providing cell and frequency lists for multicast service continuity via dedicated or broadcast signaling, and enabling shared processing for MBS and unicast reception, with enhancements for RAN sharing scenarios to improve resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast transmission is limited to UEs in RRC_CONNECTED state, then service continuity can be maintained, but power consumption increases and resource efficiency decreases
Solution Approach 1:
The patent changes the RRC state parameter from CONNECTED to INACTIVE for multicast reception, allowing UEs to receive multicast transmissions while in a lower power state. This is achieved by introducing new RRC_INACTIVE state configurations that support multicast service continuity without requiring full connected state maintenance.
Solution Approach 2:
The patent segments the multicast service delivery by introducing separate configuration mechanisms for RRC_INACTIVE state, distinguishing it from the traditional RRC_CONNECTED approach. This allows optimized resource allocation and power management specific to inactive state multicast reception.
2Reliability
If UEs remain in RRC_CONNECTED state for multicast reception, then service continuity is ensured, but resource efficiency and scalability deteriorate in cells with large number of UEs
Solution Approach 1:
The patent modifies system parameters by enabling multicast service in RRC_INACTIVE state, which reduces the number of UEs that need to maintain connected state resources. This parameter change improves overall system productivity by allowing more UEs to receive multicast services without consuming connected state resources.
Solution Approach 2:
The patent makes the RRC_INACTIVE state multi-functional by enabling it to support both unicast and multicast receptions simultaneously. This universal capability allows the inactive state to serve multiple purposes, improving resource efficiency while maintaining service continuity.
3Reliability
If separate processing is used for broadcast and unicast reception, then service reliability is maintained, but device complexity and processing overhead increase
Solution Approach 1:
The patent merges broadcast and unicast reception processing by enabling simultaneous handling of both service types in RRC_INACTIVE state through unified configuration mechanisms. This reduces device complexity by consolidating processing paths while maintaining service reliability through proper resource allocation.
Solution Approach 2:
The patent creates a universal processing framework in RRC_INACTIVE state that can handle both broadcast and unicast receptions, eliminating the need for separate dedicated processing paths and reducing overall system complexity.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide processing of multicast data via user equipment while the user equipment is in an inactive state in wireless communication systems.