Cell Re-Selection Timing for DRX-Based Neighbor Cell Detection
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) faces challenges in synchronizing cell detection procedures when switching between cells with different discontinuous reception (DRX) cycle configurations, leading to unclear delay conditions and resource inefficiencies.
Innovation Solution
The UE calculates a cell re-selection transition period based on the DRX cycle configurations of the source and target cells to ensure synchronized and efficient completion of neighbor cell detection during cell re-selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE initiates a cell detection procedure on a first cell with a specific DRX cycle configuration and then switches to a second cell with a different DRX cycle configuration, then the UE can maintain connectivity and perform cell re-selection, but the delay condition for completing the cell detection procedure becomes unclear
Solution Approach 1:
The patent applies preliminary action by defining the cell re-selection transition period duration before the cell detection procedure completes. The network node configures this transition period based on the DRX cycle configurations of both the first and second cells, establishing clear timing parameters in advance that guide the UE's cell detection operations during the transition, thereby resolving the ambiguity about delay conditions
Solution Approach 2:
The patent utilizes parameter changes by adjusting the cell re-selection transition period duration according to the specific DRX cycle configurations involved. When switching between cells with different DRX cycles, the transition period is recalculated based on the relationship between the first DRX cycle and second DRX cycle parameters, ensuring the delay condition adapts to the specific cell pair being transitioned between
2Reliability
If the UE performs cell detection measurements during cell re-selection between cells with different DRX cycle configurations, then the UE can ensure proper timing alignment, but additional complexity is introduced in calculating the transition period duration
Solution Approach 1:
The patent introduces an intermediary approach by having the network node perform the complex calculation of the cell re-selection transition period duration. Instead of requiring the UE to independently calculate the transition period based on DRX cycle relationships, the network node determines this parameter and provides it to the UE, simplifying the UE's role while ensuring accurate timing synchronization
Solution Approach 2:
The patent applies dynamics by making the cell re-selection transition period a flexible parameter that adapts to different DRX cycle configurations. The transition period duration is not fixed but is dynamically determined based on the specific relationship between the first DRX cycle and second DRX cycle, allowing the system to optimize timing for each cell re-selection scenario
3Productivity
If the UE completes cell detection procedure quickly during cell re-selection, then resource usage is optimized, but the UE may not adequately account for different DRX cycle configurations between source and target cells
Solution Approach 1:
The patent applies preliminary action by establishing the cell re-selection transition period duration before the cell detection procedure begins. This pre-defined transition period ensures that the UE has sufficient time to complete cell detection measurements while properly accounting for the DRX cycle configurations of both the source and target cells, preventing premature completion that would ignore DRX alignment requirements
Solution Approach 2:
The patent utilizes feedback by having the network node configure the cell re-selection transition period based on the DRX cycle configurations and provide this information to the UE. The UE then uses this configured parameter to guide its cell detection timing, creating a feedback loop where the network's knowledge of DRX configurations informs the UE's detection speed and timing decisions
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, configuration information indicating a first discontinuous reception (DRX) cycle configuration associated with a first cell and a second DRX cycle configuration associated with a second cell. The UE may initiate, while a selected cell of the UE is the first cell, a cell detection procedure associated with a neighbor cell. The UE may switch, prior to a completion of the cell detection procedure, the selected cell from the first cell to the second cell. The UE may perform, during a cell re-selection transition period, one or more measurements of the neighbor cell associated with the cell detection procedure, having an amount of time that is associated with the first DRX cycle configuration and/or the second DRX cycle configuration. Numerous other aspects are described.