Inactive-State Multicast Reception With Beam-Specific Preambles
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Solution Overview
Problem
Current multicast services in New Radio (NR) systems require User Equipment (UE) to be in a connected state for reception, leading to increased signaling overhead and network load due to the need for network-configured measurements and reports, and the network struggles to track beam information for UE in an inactive state.
Innovation Solution
The method involves sending first and second indication information to enable UE to receive multicast services in an inactive state, with the first indication directly indicating reception and the second indicating conditions for reception, using RRC release signaling, paging, and beam-specific preambles to optimize beam tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE receives multicast service in connected state, then service quality is guaranteed, but signaling overhead and network load increase
Solution Approach 1:
The patent changes the state parameter of UE from connected state to inactive state for receiving multicast services. By modifying this fundamental state parameter, the system enables UE to receive services without maintaining full connected state, thereby reducing signaling overhead while preserving service quality through alternative mechanisms like beam-specific preambles and indication information.
2Measurement precision
If UE receives multicast service in connected state, then measurement and report tasks are performed, but network load increases
Solution Approach 1:
The patent extracts the essential measurement and reporting functions from the connected state requirement. By separating these functions, the system enables UE to perform necessary measurements for multicast service reception without maintaining full connected state, thus reducing network load while preserving measurement precision through beam-specific preambles and indication information.
3Adaptability or versatility
If network tracks beam information for UE in inactive state, then service reception is enabled, but tracking complexity increases
Solution Approach 1:
The patent enables UE to autonomously determine suitable beams for receiving multicast services in inactive state using beam-specific preambles and indication information. This self-service approach allows UE to independently identify and select appropriate beams without requiring extensive network tracking, thereby reducing tracking complexity while maintaining adaptability.
Data Source
AI summary
A method and apparatus for sending a multicast service in an inactive state, and a method and apparatus for receiving a multicast service in an inactive state are provided. The method for sending the multicast service in the inactive state includes: sending first indication information and second indication information, wherein the first indication information indicates receiving the multicast service in the inactive state, and the second indication information indicates a condition that requires to be met to receive the multicast service in the inactive state; and sending data of the multicast service.