Conditional Handover via Network Energy Savings Mode Indication
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Solution Overview
Problem
In wireless communications, user equipment (UE) struggles to determine the network energy savings (NES) mode of cells, which limits its ability to perform conditional handover (CHO) procedures correctly.
Innovation Solution
A network entity indicates the NES mode status of cells in a common control message, specifically through downlink control information (DCI) messages, which include indications for discontinuous transmission (DTX) and discontinuous reception (DRX) configurations, allowing UEs to monitor CHO execution conditions based on the NES mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network entity does not indicate NES mode status to UEs, then the control message structure remains simple, but UEs cannot determine the appropriate CHO execution conditions
Solution Approach 1:
The control message is segmented into multiple information blocks, where each block corresponds to a specific cell and contains NES mode status indications for that cell. This allows UEs to selectively process only the information blocks relevant to their serving cells and candidate target cells, reducing processing complexity while providing precise NES mode status for accurate CHO execution condition determination.
Solution Approach 2:
The NES mode status indication is extracted as a separate, dedicated field within the information blocks of the control message. This extraction allows the NES mode information to be clearly identified and processed independently from other control information, enabling UEs to accurately determine CHO execution conditions without being overwhelmed by the overall message complexity.
2Reliability
If the network entity includes NES mode indications in common control messages, then CHO procedures are enhanced with accurate execution conditions, but the control message size and processing overhead increase
Solution Approach 1:
NES mode status indications are included only in the information blocks corresponding to cells that are relevant to specific UEs (serving cells and candidate target cells). This local quality approach ensures that each UE receives and processes only the NES mode information necessary for its CHO decisions, reducing overall data volume while maintaining high reliability for handover management.
Solution Approach 2:
The information blocks in the control message serve multiple functions: they convey cell configuration information, DTX/DRX settings, and NES mode status indications all in a unified structure. This multi-functionality reduces the need for separate messages and minimizes overall control message data volume while providing comprehensive information for reliable CHO execution.
3Productivity
If UEs monitor multiple CHO execution conditions based on NES mode, then handover performance is improved, but UE processing complexity increases
Solution Approach 1:
The system implements asymmetric monitoring where UEs adapt their CHO execution condition monitoring based on the NES mode status indicated in the control message. When NES mode is active, UEs monitor for NES-specific execution conditions; when inactive, they monitor for traditional conditions. This asymmetric approach improves handover execution efficiency by focusing monitoring efforts on relevant conditions while reducing UE processing complexity through conditional logic.
Solution Approach 2:
The CHO execution conditions are made dynamic based on the NES mode status. UEs dynamically adjust which execution conditions to monitor and evaluate based on the current NES mode indication received in control messages. This dynamic adaptation allows efficient handover execution by activating appropriate monitoring only when needed, reducing ongoing processing complexity while maintaining high productivity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques provide for a network entity to indicate a network energy savings (NES) mode status for one or more cells in a common control message sent to a group of user equipments (UEs). The network entity may include one or more NES mode indications in a downlink control information (DCI) message that activates or deactivates a discontinuous transmission (DTX) configuration, a discontinuous reception (DRX) configuration, or both for one or more cells. The DCI message may include the DTX and the DRX information in one or more respective information blocks corresponding one or more serving cells for the group of UEs, and the network entity may include the one or more NES mode indications in the one or more information blocks.