Inactive-State Multicast Reception for UE Service Continuity
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Solution Overview
Problem
Existing multicast reception solutions for user equipment (UE) in an inactive state are incomplete and inefficient, particularly for cells with a large number of UEs, leading to power inefficiencies and unclear methods for transitioning between connected and inactive states.
Innovation Solution
A method for UE to transmit a preference message for multicast reception in an inactive or idle state, receive a multicast configuration, and perform the reception based on this configuration, enabling precise entry into an inactive or idle state for seamless multicast service continuity during cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs are kept in a connected state to support multicast reception, then multicast service continuity is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic state transitions for UEs, allowing them to switch between connected and inactive states based on multicast service requirements. The network device configures specific inactive state parameters for multicast reception, enabling UEs to maintain multicast service continuity while transitioning to a lower power consumption state when appropriate.
Solution Approach 2:
The patent introduces specific configuration parameters for multicast reception in inactive state (e.g., inactiveCastFilteringDedicatedRNTI, inactiveCastPagingRadioNetworkTemporaryIdentifier). These parameter changes enable the system to distinguish and optimize multicast service handling in inactive state, resolving the contradiction between service continuity and power efficiency.
2Use of energy by moving object
If UEs transition to inactive state for multicast reception, then power efficiency is improved, but service continuity may be disrupted
Solution Approach 1:
The network device performs preliminary configuration of inactive state parameters before the UE transitions to inactive state. This includes configuring dedicated RNTIs and paging parameters specifically for multicast reception, ensuring that service continuity is maintained even after state transition.
Solution Approach 2:
The patent implements feedback mechanisms where UEs report their capability to receive multicast in inactive state, and the network device adjusts configurations accordingly. This ensures that service continuity requirements are met while optimizing power efficiency.
3Use of energy by moving object
If multicast configuration for inactive state is implemented, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent designs the inactive state multicast configuration to serve multiple purposes: it enables power-efficient multicast reception, provides a framework for future service types, and maintains compatibility with existing connected state mechanisms. The configuration parameters are integrated into the existing RRC framework, reducing overall system complexity.
4Reliability
If comprehensive multicast configuration is provided for inactive state, then service continuity is improved, but message overhead increases
Solution Approach 1:
The patent extracts and isolates only the essential configuration parameters needed for multicast reception in inactive state, rather than providing complete connected state configurations. This includes specific RNTIs and paging parameters, reducing message overhead while maintaining service continuity.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. If a terminal device is to perform a multicast reception in an inactive or idle state, the terminal device transmits, to a network device, a first message comprising a preference on the multicast reception in the inactive or idle state, and receives, from the network device, a second message indicating the multicast reception in the inactive or idle state and comprising a multicast configuration for the multicast reception. Then the terminal device performs the multicast reception in the inactive or idle state based on the multicast configuration. In this way, a terminal device may precisely or reasonably enter an inactive or idle state to receive a multicast service. Further, the terminal device may receive a multicast configuration to make sure the service continuity upon cell reselection.