Dynamic Cell Group Configuration for Multi-TRP Mobility
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing inter-cell mobility in multi-transmission reception point (mTRP) deployments due to slow cell reconfiguration via RRC signaling, leading to decreased coverage and resource inefficiency for highly mobile UEs.
Innovation Solution
Implementing dynamic signaling (L1 or L2) for cell group configuration and TRP switching, allowing networks to activate, deactivate, or remove cells dynamically, using MAC CE or DCI signaling, to enhance mobility management in mTRP environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If RRC signaling is used for cell reconfiguration in mTRP deployments, then configuration accuracy is ensured, but reconfiguration speed is slow leading to decreased coverage for highly mobile UEs
Solution Approach 1:
The patent segments the cell reconfiguration process into two distinct phases: (1) RRC signaling for configuring multiple candidate cell groups with parameters, and (2) MAC CE or DCI signaling for rapid activation/deactivation of specific cell groups. This segmentation allows configuration accuracy to be maintained in the first phase while enabling fast switching in the second phase, thus resolving the contradiction between reconfiguration speed and coverage reliability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple candidate cell groups with complete parameters using RRC signaling before mobility events occur. When a UE becomes highly mobile, the network can immediately activate a pre-configured candidate cell group using fast MAC CE or DCI signaling without requiring time-consuming RRC reconfiguration, thereby maintaining coverage reliability while improving reconfiguration speed.
2Adaptability or versatility
If multiple cell groups are configured with multiple candidate roles, then adaptability for mobility management is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by enabling the network to dynamically activate or deactivate specific cell groups from a pre-configured set using MAC CE or DCI signaling. The UE maintains configurations for multiple candidate cell groups but only actively processes one or few at a time, with the network dynamically controlling which groups are active based on UE mobility state. This dynamic approach provides high mobility management adaptability while keeping the actively processed configuration complexity manageable.
Solution Approach 2:
The patent applies partial action by having the UE maintain complete configuration information for multiple candidate cell groups but only actively monitor and process a subset of these groups at any given time. The network activates only the necessary cell groups based on current mobility conditions, avoiding the need for the UE to continuously process all possible configurations, thus balancing adaptability with manageable complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may configure one or more user equipments (UEs) with cell group configuration information for a single cell group or multiple cell groups. The configuration information may include parameters for each cell in the one or more cell groups. The configuration information may include a set of parameters for multiple candidate roles for each cell in the cell group. The network may then dynamically switch, update, or activate, cell groups, and may dynamically switch transmission reception points (TRPs) in a cell group from one role to another via dynamic signaling (e.g., level 1 (L1) or level 2 (L2) signaling). Additionally, or alternatively, the network may activate, deactivate, add, or remove, individual cells or cell groups from a set of configured cells via L1 or L2 signaling.