MTC Device HARQ Timing Adjustment for DRX Optimization
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Solution Overview
Problem
Current discontinuous reception (DRX) modes in wireless communication systems do not optimize power and resource conservation for machine-type communication (MTC) devices, leading to suboptimal energy savings and operational efficiency.
Innovation Solution
Implementing a method where MTC devices adjust acknowledgement timing to align with DRX cycles, allowing for prolonged power-down periods and optimizing DRX timing indicators based on system load, quality of service (QoS) levels, and delay sensitivity, thereby enhancing power conservation and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If MTC devices use traditional DRX modes with fixed acknowledgement timing, then the system maintains simple timing structure, but power conservation is suboptimal because devices cannot prolong power-down periods
Solution Approach 1:
The patent applies dynamics by making the acknowledgement timing flexible rather than fixed. The device adjusts the acknowledgement timing dynamically based on the DRX cycle timing, allowing the timing to adapt to different DRX configurations. This enables the device to prolong power-down periods while maintaining proper HARQ operation, directly improving power conservation without excessive complexity
Solution Approach 2:
The patent changes the timing parameter from a fixed value to a variable that depends on DRX cycle configuration. By adjusting the acknowledgement timing parameter based on DRX cycle length and timing indicator, the system optimizes power conservation while maintaining HARQ functionality. The timing indicator received from the network allows flexible parameter adjustment without complex device architecture
2Productivity
If MTC devices provide acknowledgements immediately after data reception, then the system maintains fast HARQ feedback, but the device cannot enter low-power state immediately reducing operational efficiency
Solution Approach 1:
The patent applies preliminary action by having the device determine the acknowledgement timing in advance based on the timing indicator and DRX cycle configuration. The device knows beforehand when it should provide acknowledgements, allowing it to enter low-power state immediately after data reception and wake up at the predetermined acknowledgement time. This improves operational efficiency by maximizing time in low-power state while maintaining fast HARQ feedback through proper timing alignment
3Use of energy by moving object
If the system uses extended DRX cycles for better power saving, then power conservation improves, but HARQ timing alignment becomes difficult causing protocol complexity
Solution Approach 1:
The patent applies feedback by using a timing indicator provided by the network that gives information about the DRX cycle timing. The device uses this feedback information to align its HARQ acknowledgements with the extended DRX cycles. This allows the system to use extended DRX cycles for better power conservation while maintaining proper HARQ timing alignment through the feedback mechanism, avoiding protocol complexity
Solution Approach 2:
The patent makes the timing indicator mechanism universal, allowing it to work with both short and extended DRX cycles. The same timing indicator and adjustment mechanism handles different DRX configurations, providing a unified solution for HARQ-DRX timing alignment across various cycle lengths. This reduces protocol complexity by avoiding separate mechanisms for different DRX types while maintaining power conservation benefits of extended cycles
Data Source
AI summary
A method for wireless communication may include a mobile entity receiving a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode, and adjusting at least an acknowledgement timing in response to receiving the timing indicator for the DRX cycle. A base station in communication with the mobile entity may provide a timing indicator for a DRX cycle during a DRX mode to the mobile entity, transmit at least one of downlink (DL) data or an uplink (UL) grant indicator to the mobile entity at a first time, and waiting from the first time for a time period indicated by the timing indicator before receiving at least one of an acknowledgement of the DL data or UL data responsive to the UL grant from the mobile entity.