RRC-Inactive Multicast Reception With Neighbor-Cell Mobility
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Solution Overview
Problem
Multicast reception is not supported for user equipments (UEs) operating in a radio resource control (RRC) inactive state, limiting the number of UEs that can transition to this state and thereby reducing the network's load reduction and latency benefits.
Innovation Solution
UEs and network nodes are enabled to transmit and receive capability, configuration, and mobility information to support multicast communications in an inactive state, allowing UEs to receive multicast communications from both the current and neighboring cells without transitioning to a connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast reception is only supported for UEs in RRC connected state, then multicast service can be received reliably, but the network load reduction and latency benefits of RRC inactive state are limited
Solution Approach 1:
The patent changes the operational parameters by enabling multicast reception capability in RRC inactive state, allowing UEs to receive multicast traffic without transitioning to connected state. This is achieved through configuration parameters including common frequency resource (CFR) indications, multicast mobility information for neighboring cells, and capability information exchange between UE and network, thereby resolving the contradiction between reliable multicast reception and network load reduction
2Ease of operation
If UEs transition to RRC connected state to receive multicast configuration, then multicast reception is enabled, but network resources are consumed and latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multicast reception parameters including CFR indications and neighboring cell mobility information while the UE is in inactive state. This allows the UE to immediately receive multicast communications without the time-consuming transition to connected state, thereby reducing state transition latency while maintaining ease of multicast reception
3Quantity of substance
If UEs in RRC inactive state cannot receive multicast, then network resources are saved, but the quantity of UEs that can be in inactive state is limited
Solution Approach 1:
The patent applies universality by designing a multi-functional configuration framework that handles both traditional connected-state multicast and the new inactive-state multicast reception. The network node universally manages multicast configuration through standardized procedures including capability information exchange, CFR indication, and mobility information provision, allowing a greater quantity of UEs to remain in inactive state while maintaining manageable configuration complexity
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit capability information indicating a capability of the UE to receive multicast communications while operating in an inactive state. The UE may receive, from a first cell, configuration information that indicates a common frequency resource (CFR) associated with receiving multicast communications from the first cell while operating in the inactive state. The UE may receive, from the first cell, multicast mobility information associated with receiving multicast communications from one or more neighboring cells while operating in the inactive state. The UE may receive, while operating in the inactive state, one or more multicast communications from at least one of the first cell or a second cell based at least in part on at least one of the configuration information or the multicast mobility information. Numerous other aspects are provided.