Conditional Serving Cell Change with Network Assistance Information
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Solution Overview
Problem
Current conditional cell change procedures in wireless communications face challenges such as increased overhead and resource wastage due to early data forwarding, load imbalances, and complexity from varying UE capabilities and SSB types, leading to inefficient handover processes.
Innovation Solution
The proposed solution involves a UE transmitting User Assistance Information (UAI) to a network entity, which responds with Network Assistance Information (NAI) indicating candidate cells that support specific coverage enhancements, allowing the UE to select a target cell based on conditions such as signal quality, loading status, and energy saving status, thereby optimizing the cell change process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If early data forwarding is performed to all candidate cells, then handover reliability is improved, but processing overhead and resource consumption increase
Solution Approach 1:
The patent extracts and removes unnecessary data forwarding operations by identifying and eliminating candidate cells that do not meet selection criteria. The network entity determines a subset of candidate cells based on UE assistance information and performs data forwarding only to selected cells, rather than all candidate cells, thereby reducing processing overhead while maintaining handover reliability.
Solution Approach 2:
The patent applies preliminary action by having the network entity determine and select candidate cells before performing data forwarding. The network entity uses UE assistance information to pre-identify suitable target cells, and only establishes data forwarding to those selected cells, avoiding unnecessary processing and resource consumption associated with unselected candidates.
2Reliability
If data is forwarded to multiple candidate cells, then handover success rate is improved, but resource wastage increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different candidate cells based on their individual characteristics and the UE's specific needs. The network entity selectively forwards data to only those candidate cells that are determined to be suitable targets, rather than uniformly forwarding to all candidates, thereby optimizing resource utilization while maintaining handover success rate.
Solution Approach 2:
The patent implements partial action by performing data forwarding to only a subset of candidate cells rather than all of them. The network entity determines the appropriate number and identity of candidate cells based on UE assistance information, performing just enough data forwarding to ensure successful handover without the excessive resource consumption of forwarding to all possible candidates.
3Adaptability or versatility
If the network supports multiple SSB types and UE capabilities, then system versatility is improved, but configuration complexity increases
Solution Approach 1:
The patent applies feedback by utilizing UE assistance information that is fed back from the UE to the network entity. This feedback mechanism allows the network to adapt its configuration and candidate cell selection based on the specific UE capabilities and supported SSB types, thereby managing configuration complexity while maintaining system versatility.
Solution Approach 2:
The patent implements dynamics by making the candidate cell determination process adaptive rather than static. The network entity dynamically selects candidate cells based on real-time UE assistance information, allowing the system to flexibly accommodate different UE capabilities and SSB types without requiring complex pre-configured tables or rigid procedures.
4Reliability
If conditional cell change procedures are implemented, then handover reliability is improved, but processing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by having the network entity determine and prepare candidate cells in advance based on UE assistance information before the actual handover is needed. This pre-determination reduces the processing time required at the moment of handover execution, as the candidate cell selection has already been performed and validated.
Solution Approach 2:
The patent implements self-service by enabling the UE to provide assistance information about its capabilities and preferences, which the network entity then uses to automatically determine suitable candidate cells. This reduces the need for complex network-side analysis and processing, thereby reducing overall processing time while maintaining handover reliability.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a message indicating UE assistance information (UAI). In some examples, the UE may transmit a request for network assistance information (NAI) for candidate cells. The UE may receive a control message indicating the NAI and a set of candidate cells for a conditional serving cell change. The UE may perform the conditional serving cell change based on the NAI for one or more candidate cells. In some examples, the UE may select a target cell from the set of candidate cells, and the UE may receive a control message indicating one or more coverage enhancement schemes supported by the target cell. The UE may perform a random access procedure based on the one or more coverage enhancement schemes supported by the target cell.