DRX Timer Management for Multiple Repetition Transmission
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE, face challenges in efficiently managing DRX timers for multiple repetition transmissions, leading to performance deterioration and increased power consumption in low-complexity User Equipment (UE) devices, which affects battery life and data transmission reliability.
Innovation Solution
The proposed solution involves modifying the DRX timer management for low-complexity UEs by configuring the drx-InactivityTimer, drx-RetransmissionTimer, and HARQ RTT Timer to accommodate multiple repetition transmissions, ensuring adequate time for PDCCH and PDSCH reception, and optimizing the DRX cycle to balance power savings and data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DRX timers are configured for multiple repetition transmissions, then data transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the DRX timer configuration adaptive rather than static. The base station dynamically adjusts timer values (drx-InactivityTimer, drx-RetransmissionTimer, HARQ RTT Timer) based on the actual number of repetitions needed for successful transmission. This allows the system to optimize between reliability and power consumption by using longer timers only when multiple repetitions are required, and shorter timers when single transmission succeeds.
Solution Approach 2:
The patent changes the parameters of DRX timers (drx-InactivityTimer, drx-RetransmissionTimer, HARQ RTT Timer) to accommodate multiple repetition transmissions. By modifying these timer parameter values, the system ensures adequate monitoring time for repeated transmissions while avoiding excessive power consumption that would result from always using maximum timer values.
2Use of energy by moving object
If DRX cycle is optimized for power savings, then battery life is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent makes the DRX cycle configuration dynamic by allowing the base station to adjust timer values based on transmission conditions. When power savings are prioritized, longer DRX cycles can be used with shorter timers. When transmission efficiency is prioritized, the system can switch to shorter DRX cycles with appropriately configured timers to ensure rapid retransmission if needed.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple DRX timer parameter sets that can be activated based on transmission conditions. The base station can prepare appropriate timer configurations in advance and switch between them depending on whether power savings or transmission efficiency is the current priority, avoiding the need for real-time complex calculations.
3Reliability
If monitoring time is extended for multiple repetitions, then coverage is improved, but battery life deteriorates
Solution Approach 1:
The patent changes the monitoring time parameters (drx-InactivityTimer, drx-RetransmissionTimer, HARQ RTT Timer) based on the actual coverage requirements. For cells with poor coverage requiring multiple repetitions, the patent extends these timer parameters to ensure adequate monitoring time. For cells with good coverage where single transmission suffices, the patent uses shorter timer values, thereby preserving battery life.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for handling of DRX timers for multiple repetition transmission in wireless communication system, the method comprising: monitoring a Physical Downlink Control Channel (PDCCH) during an active time when Discontinuous Reception (DRX) is configured; receiving multiple repetitions of a PDCCH in a first plurality of subframes; receiving multiple repetitions of Physical Downlink Shared Channel (PDSCH) corresponding to the PDCCH in a second plurality of subframes; starting a Hybrid ARQ (HARQ) Round Trip Time (RTT) Timer in a subframe containing a last repetition of the multiple repetitions of the PDSCH.