UE Timing Tracking for Non-Serving Cell Handover Synchronization
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Solution Overview
Problem
User Equipment (UE) configured with different capabilities for simultaneously tracking timing for non-serving cells with different reception timings may lead to synchronization issues with the base station, resulting in unnecessary power, network, and computing resource consumption during handover attempts to inferior cells.
Innovation Solution
UE and base station communicate to manage the number of non-serving cells with different reception timings, allowing synchronized tracking and reducing the number of cells to be tracked based on UE capability, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE tracks timing for multiple non-serving cells with different reception timings, then mobility measurement capability is improved, but synchronization with base station deteriorates and resource consumption increases
Solution Approach 1:
The UE performs capability indication beforehand, informing the base station of its maximum tracking capacity for non-serving cells with different reception timings. This preliminary action allows the base station to configure an appropriate number of cells to track, preventing synchronization issues before they occur.
Solution Approach 2:
The UE provides feedback to the base station regarding its capability to simultaneously track non-serving cells with different reception timings. This feedback mechanism enables the base station to adjust the configuration accordingly, maintaining synchronization while utilizing the UE's mobility measurement capabilities.
2Adaptability or versatility
If UE tracks more non-serving cells, then handover options increase, but power consumption and resource usage increase
Solution Approach 1:
Instead of tracking all available non-serving cells, the UE tracks only a subset determined by its capability indication. This partial action approach provides sufficient handover options while avoiding the excessive power consumption that would result from tracking all possible cells.
Solution Approach 2:
The system changes the parameter of tracking quantity from a fixed maximum to a dynamically adjusted value based on UE capability. This allows the network to optimize the balance between handover options and power consumption by configuring an appropriate number of cells rather than always using the maximum.
3Device complexity
If base station configures UE to track non-serving cells without capability knowledge, then network control is simplified, but handover accuracy deteriorates
Solution Approach 1:
The capability indication is performed in advance during initial configuration, allowing the base station to plan handover strategies with accurate knowledge of UE capabilities. This preliminary information enables precise handover decisions without adding significant complexity to the control process.
Solution Approach 2:
The system transitions from a static, one-size-fits-all configuration approach to a dynamic, capability-based configuration. The base station adapts the tracking configuration based on the specific UE's capabilities, improving handover accuracy while maintaining reasonable network control complexity through automated capability-based decisions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a base station associated with a serving cell, an indication of support for simultaneously tracking timing for a first number of non-serving cells having different respective reception timings. The UE may receive, from the base station, an indication to track timing for a second number of the non-serving cells having different respective reception timings, the second number being less than or equal to the first number. Numerous other aspects are provided.