User Equipment Control Channel Monitoring in Discontinuous Reception
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Solution Overview
Problem
User equipment in wireless communication systems experiences significant battery consumption due to the need to monitor control channels every transmission time interval, especially in E-UMTS systems, which limits operation time.
Innovation Solution
Implementing a method where the user equipment monitors the physical downlink control channel only during a monitored duration within a discontinuous reception period, followed by a non-monitored duration, and extends monitoring if decoding is successful, allowing for continuous reception mode when scheduling information is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment monitors the control channel every transmission time interval, then the reliability of receiving control information is improved, but the battery consumption increases significantly
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the user equipment monitors the control channel periodically during active periods rather than continuously. The monitoring is divided into active periods when the control channel is monitored and inactive periods when monitoring is suspended, reducing battery consumption while maintaining reliable control information reception through strategic periodic sampling.
2Duration of action of moving object
If the user equipment continuously monitors the control channel, then the operation time is extended, but the battery consumption increases
Solution Approach 1:
The patent applies discontinuous reception with periodic monitoring during active periods followed by inactive periods. This periodic action pattern extends operation time by allowing the user equipment to remain operational while reducing battery consumption through intervals of non-monitoring, effectively decoupling continuous operation from continuous energy expenditure.
3Reliability
If the monitored duration is extended to ensure reliable decoding, then the control information reception reliability is improved, but the battery consumption during active periods increases
Solution Approach 1:
The patent implements feedback mechanisms where the user equipment reports decoding status and scheduling information to the base station. Based on this feedback, the base station can adjust the monitored duration and active period configuration, allowing the system to achieve reliable decoding with minimal energy expenditure by only extending monitoring when necessary based on actual decoding performance.
Data Source
AI summary
A method of monitoring a control channel in a wireless communication system includes monitoring a physical down-link control channel (PDCCH) during a monitored duration, wherein the monitored duration is a part of a discontinuous reception (DRX) period, the DRX period specifying the periodic repetition of the monitored duration followed by a non-monitored duration. By monitoring a control channel during a DRX period, battery consumption of a user equipment can be reduced and an operation time of the user equipment can be increased.