Predictive DCP Indications for CDRX Latency and Power Trade-off
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Solution Overview
Problem
Wireless communication systems face latency issues due to the use of connected mode discontinuous reception (CDRX) mechanisms, which can lead to inactive CDRX duration windows and increased power consumption at user equipment (UE) devices.
Innovation Solution
The implementation of a predictive framework for downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a power-saving radio network temporary identifier (PS-RNTI) (DCP) monitoring, where the network predicts DL packet arrivals based on packet arrival history data and adjusts DCP indications accordingly to activate or deactivate CDRX duration windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If CDRX mechanisms are used to save power at UE devices, then power consumption is reduced, but latency increases due to inactive CDRX duration windows
Solution Approach 1:
The network performs preliminary actions by predicting DL packet arrivals before the CDRX on duration window occurs. Based on packet arrival history data, the network proactively determines whether to activate or deactivate the CDRX window, sending DCP indications in advance. This preliminary action ensures that when the CDRX window activates, packets are already ready for immediate transmission, eliminating latency while maintaining power savings during inactive periods.
Solution Approach 2:
The patent implements dynamic adjustment of CDRX window activation status based on real-time traffic patterns. The network continuously monitors packet arrival history and dynamically decides whether to activate or deactivate upcoming CDRX windows. This dynamic approach allows the system to adapt to varying traffic conditions, activating windows only when packets are predicted to arrive, thereby optimizing both power consumption and latency performance.
2Loss of time
If CDRX on duration windows are activated frequently to reduce latency, then latency is reduced, but power consumption increases
Solution Approach 1:
The network utilizes feedback from packet arrival history data to make informed decisions about CDRX window activation. By analyzing historical packet arrival patterns, the system receives feedback on actual traffic behavior and adjusts its predictions accordingly. This feedback mechanism enables the network to accurately predict when packets will arrive and activate CDRX windows only when necessary, avoiding unnecessary activations that would increase power consumption while still reducing latency when packets are expected.
3Loss of time
If the network monitors packet arrival history data to predict DL packet arrivals, then latency is reduced through accurate CDRX activation, but device complexity increases
Solution Approach 1:
The network performs self-service by automatically monitoring its own packet arrival history data and using this information to predict future packet arrivals. The system independently analyzes its traffic patterns, generates predictions, and makes activation decisions without requiring complex external intervention or sophisticated algorithms. This self-service approach reduces latency through accurate predictions while keeping the implementation relatively simple, as the network leverages existing monitoring capabilities rather than introducing entirely new complex systems.
Data Source
AI summary
Systems and methods related to “on/off” determinations regarding the performance of physical downlink control channel (PDCCH) monitoring during connected mode discontinuous reception (CDRX) on duration windows are disclosed herein. In some cases, a radio access network (RAN) predicts whether a downlink (DL) packet for a UE will arrive at a buffer of the RAN prior to an end of a CDRX on duration window of the UE, and sends a downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a power-saving radio network temporary identifier (PS-RNTI) (DCP) for the CDRX on duration window indicating whether or not the UE should perform PDCCH monitoring during the CDRX on duration window based on the prediction. In some cases, a UE determines a current state of DL traffic and adaptively uses DCP monitoring based on the current state of the traffic. Aggregation level adaptation by the RAN is also discussed.