UL HARQ Operation Enhancement for Power Saving
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Solution Overview
Problem
Frequent channel monitoring in communication devices leads to rapid power consumption, necessitating a solution to reduce energy usage in communication technology.
Innovation Solution
Implementing an uplink Hybrid Automatic Repeat Request (UL HARQ) operation enhancement by setting a waiting section for receiving retransmission or NACK signals, determining the receipt of ACK signals, counting time, and stopping the monitoring of Physical Downlink Control Channel (PDCCH) and/or Physical Hybrid ARQ Indicator Channel (PHICH) once the waiting section is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent channel monitoring is performed to ensure reliable data transmission, then communication reliability is improved, but power consumption increases rapidly
Solution Approach 1:
The patent implements periodic action by introducing a waiting section that operates in cycles. After receiving an ACK signal, the system enters a waiting period where it does not continuously monitor the channel, but rather checks at specific periodic intervals whether the waiting section has been reached. This periodic monitoring approach maintains communication reliability while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent applies dynamics by making the monitoring behavior adjustable and adaptive. The waiting section can be configured with different durations, and the system can dynamically adjust its monitoring behavior based on communication conditions. This dynamic approach allows the system to optimize between reliability and power consumption based on actual operational requirements.
2Reliability
If all HARQ transmission responses are monitored to ensure complete feedback reception, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent extracts the unnecessary monitoring of certain HARQ transmission responses. By introducing the waiting section mechanism, the system selectively stops monitoring after a predetermined period following ACK reception, extracting or removing the redundant monitoring function that would consume power without providing additional reliability benefit.
Solution Approach 2:
The patent applies partial action by not monitoring all possible HARQ transmission responses indefinitely, but rather monitoring only for a limited duration defined by the waiting section. This partial monitoring approach is sufficient for reliable communication while avoiding the excessive action of continuous monitoring, thereby reducing power consumption.
Data Source
AI summary
An UL HARQ operation enhancement for power enhancement/saving is provided. A controlling method for the user equipment includes the following steps. A waiting section for receiving a retransmission (RETX) grant signal or a Negative Acknowledgement (NACK) signal is set. Whether the user equipment receives a Acknowledge (ACK) signal is determined. After the ACK signal is received, time or count is counted. Whether the waiting section is reached is determined. After the waiting section is reached, monitoring Physical Downlink Control Channel (PDCCH) and/or Physical Hybrid ARQ Indicator Channel (PHICH) is stopped.