Beam Failure Recovery PDCCH Monitoring With RTT-Based Power Saving
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Solution Overview
Problem
Terminal devices face challenges in balancing the need to monitor the Physical Downlink Control Channel (PDCCH) for network responses, particularly during Beam Failure Recovery (BFR), while also conserving power through PDCCH skipping mechanisms.
Innovation Solution
The terminal device determines whether to skip PDCCH monitoring based on the time interval since transmitting uplink information and the Round-Trip Time (RTT) with the network, allowing for both response reception and power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device skips PDCCH monitoring to save power, then power consumption is reduced, but the ability to receive network responses is compromised
Solution Approach 1:
The patent implements dynamic PDCCH monitoring adjustment by allowing the terminal to switch between monitoring and skipping modes based on the timing relationship between uplink transmission and downlink response. The monitoring behavior is dynamically controlled through a configured time window that adapts to different uplink transmission scenarios, resolving the contradiction between power saving and response reception.
Solution Approach 2:
The patent applies preliminary action by pre-configuring a time window parameter that determines when PDCCH monitoring should be performed relative to uplink transmission. This advance configuration allows the terminal to proactively prepare for potential downlink responses without continuously monitoring PDCCH, thereby saving power while ensuring reliable response reception when needed.
2Reliability
If the terminal device continuously monitors PDCCH to ensure network response reception, then response reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic PDCCH monitoring within a configured time window rather than continuous monitoring. The terminal monitors PDCCH periodically at specific intervals determined by the time window parameter, which is sufficient to capture downlink responses while allowing power-saving sleep periods in between, thus resolving the contradiction between reliability and power consumption.
Solution Approach 2:
The patent dynamically adjusts the monitoring pattern based on the timing relationship between uplink transmission and potential downlink responses. By making the monitoring behavior adaptive rather than static, the system achieves reliable response reception only when necessary, reducing unnecessary power consumption while maintaining reliability.
3Use of energy by moving object
If the terminal device skips PDCCH monitoring during BFR random access, then power saving is achieved, but the random access response may be missed
Solution Approach 1:
The patent applies preliminary action by pre-configuring a time window that extends from the uplink transmission moment to cover the expected downlink response period during BFR random access. This advance configuration ensures that the terminal monitors PDCCH at the precise moment when the random access response is expected, preventing response loss while minimizing unnecessary monitoring duration to save power.
Solution Approach 2:
The patent changes the monitoring parameter (time window configuration) specifically for BFR random access scenarios. By adjusting the time window parameter to match the BFR response timing requirements, the system ensures timely response reception during critical BFR operations while maintaining power-saving benefits in other scenarios.
Data Source
AI summary
A wireless communication method and a terminal device are provided, which are capable of both BFR and power saving of the terminal device. The method includes: transmitting, by a terminal device, first information to a network device, the first information being uplink information in a random access procedure triggered by Beam Failure Recovery (BFR); receiving, by the terminal device, first instruction information transmitted by the network device, the first instruction information instructing the terminal device to skip monitoring of Physical Downlink Control Channel (PDCCH); and determining, by the terminal device, whether to skip monitoring of PDCCH based on the first instruction information.