DRX-Aware PDCCH Monitoring for UL-DL Reconfiguration
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting discontinuous reception (DRX) while managing reconfiguration of radio resources, leading to issues such as failed message reception by user equipment (UE) due to DRX configuration.
Innovation Solution
A method and apparatus are provided to support efficient DRX in wireless communication systems by optimizing the reception of reconfiguration messages through clear definitions for UE to receive and handle radio resource reconfiguration messages, including methods for successful message reception, fallback mechanisms, and handling false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If discontinuous reception (DRX) is configured for power saving, then power consumption is reduced, but reconfiguration message reception reliability deteriorates
Solution Approach 1:
The base station performs preliminary actions by determining the DRX configuration and identifying suitable transmission time points before actually transmitting the reconfiguration message. The UE is pre-configured with DRX parameters and instructed to monitor specific subframes, ensuring it is ready to receive the message when transmitted during active periods, thus maintaining reliability while preserving power savings.
2Reliability
If reconfiguration messages are transmitted frequently to ensure reception, then message reception reliability is improved, but power consumption increases
Solution Approach 1:
The system implements periodic action by transmitting reconfiguration messages at specific periodic intervals that coincide with the UE's active periods in its DRX cycle. The base station determines transmission time points based on the DRX configuration, ensuring messages are sent when the UE is actively monitoring, thus achieving reliable delivery without requiring continuous transmission that would increase power consumption.
3Reliability
If the UE continuously monitors for reconfiguration messages, then message reception reliability is improved, but power consumption increases
Solution Approach 1:
The system applies dynamics by making the UE's monitoring behavior adaptive rather than static. The UE dynamically adjusts its monitoring activity based on DRX configuration, transitioning between active monitoring periods and sleep periods. The base station dynamically determines transmission time points based on the UE's active periods, ensuring messages are transmitted when the UE is monitoring, thus maintaining reliability while enabling power savings during non-monitoring periods.
Data Source
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AI summary
A method for a user equipment, UE, in a wireless communication system is proposed, which comprises: receiving a system information block, SIB, comprising a first uplink-downlink, UL-DL, configuration; receiving, on a first physical downlink control channel, PDCCH, a reconfiguration message comprising a second UL-DL configuration; and monitoring a second PDCCH, during an on-duration time, for a downlink subframe based on the second uplink-downlink configuration, wherein the on-duration time is counted based on a downlink subframe and a special subframe comprising a downlink pilot time slot, DwPTS, based on the first UL-DL configuration, wherein the first UL-DL configuration and the second UL-DL configuration are respectively related to a pattern of 10 subframes, wherein the pattern of 10 subframes is a combination of a certain number of uplink subframes, a certain number of downlink subframes, and a certain number of special subframes, and wherein each of the certain number of special subframes comprises a DwPTS.