RRC Inactive Multicast Reception Using Preconfigured UE Resources
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Solution Overview
Problem
Existing multicast data transmission processes are limited to the Radio Resource Control (RRC) connected state, and there is a need to enhance multicast service/data delivery during the RRC inactive state to support use cases requiring reception without state transition.
Innovation Solution
The method involves a user equipment (UE) receiving multicast configuration parameters and joining a multicast group during the RRC inactive state through random access processes, using configured grants, semi-persistent scheduling, and bandwidth parts for data reception, with feedback mechanisms like HARQ and CSI reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multicast data transmission is limited to RRC connected state only, then network control and management is simplified, but multicast service delivery capability is reduced and user mobility is restricted
Solution Approach 1:
The network performs preliminary configuration of multicast parameters and resources while the UE is in RRC connected state, storing these configurations in the inactive state. This allows the UE to quickly resume multicast reception without full state transition, resolving the contradiction by preparing advance while maintaining simplicity.
Solution Approach 2:
The patent implements dynamic state transition mechanisms where the UE can flexibly switch between RRC connected and inactive states based on multicast service requirements. The network dynamically manages multicast resource allocation across different RRC states, enabling adaptability without proportionally increasing complexity.
2Reliability
If the UE transitions to RRC connected state to receive multicast data, then reliable data reception is ensured, but service latency increases and user experience deteriorates
Solution Approach 1:
Multicast configuration parameters, including resource allocations and reception settings, are pre-configured while the UE is in RRC connected state and stored for use in inactive state. When the UE needs to receive multicast data, it can directly use these pre-configured parameters without transitioning to connected state, ensuring both reliability and low latency.
Solution Approach 2:
The patent creates a copy of the necessary multicast configuration parameters and stores them in the inactive state context. This copied configuration allows the UE to receive multicast data in inactive state with the same reliability as connected state, eliminating the need for state transition and reducing latency.
3Productivity
If the UE joins multicast group in RRC inactive state, then service continuity is improved and latency is reduced, but random access resource consumption increases
Solution Approach 1:
The network pre-allocates and configures dedicated random access resources for multicast group joining while the UE is in RRC connected state. These pre-configured resources are stored and reused when the UE needs to join or rejoin multicast groups in inactive state, enabling fast service continuity without consuming additional random access resources.
Solution Approach 2:
The UE uses self-service mechanisms to join multicast groups in inactive state by utilizing pre-configured parameters and resources stored in its context. The UE can autonomously perform multicast group joining procedures using stored configurations, reducing the need for network intervention and minimizing random access resource consumption.
Data Source
AI summary
A method of multicast data delivery in a radio resource control (RRC) inactive state includes receiving, by a user equipment (UE) in an RRC connected state, an RRC release message indicating transitioning of the UE from the RRC connected state to an RRC inactive state and receiving, while in the RRC inactive state, multicast data in response to joining a multicast group and receiving multicast configuration parameters.