PUCCH SCell Activation Timing Under PL-RS Availability Constraints
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink control channel secondary cell activation delays, particularly in 5G-NR networks operating in unlicensed spectrum, which affect network performance and latency.
Innovation Solution
Implement techniques to configure and optimize the physical uplink control channel (PUCCH) secondary cell activation delay in 5G-NR networks, leveraging carrier aggregation and listen-before-talk protocols to enhance network efficiency and reduce activation latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the PUCCH SCell activation delay is minimized, then the uplink transmission efficiency is improved, but the reliability of activation is degraded due to uncertainties in MAC CE and PL-RS activation
Solution Approach 1:
The patent applies preliminary action by performing downlink activation process and path loss calculation in advance before actual PUCCH transmission is needed. The UE calculates path loss using available reference signals beforehand, so when activation occurs, the calculations are already complete, reducing activation delay while maintaining reliability through pre-computed accurate values
Solution Approach 2:
The patent implements dynamics by adaptively adjusting the activation delay based on PL-RS availability conditions. When PL-RS is available, a shorter delay is used; when unavailable, additional time is allocated for path loss calculation. This dynamic adjustment optimizes the trade-off between activation speed and reliability based on real-time signal conditions
2Measurement precision
If the path loss calculation period is extended to account for PL-RS availability, then the measurement accuracy is improved, but the activation time is increased
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the path loss calculation period based on PL-RS availability. When PL-RS is available, the calculation period is shortened; when unavailable, it is extended to ensure accurate measurements. This parameter adaptation allows the system to maintain measurement precision while minimizing activation time based on actual signal conditions
3Reliability
If additional delays are considered for different MAC CE reception scenarios, then the activation reliability is improved, but the overall activation delay is increased
Solution Approach 1:
The patent applies preliminary action by preparing path loss calculations and activation parameters in advance for different MAC CE scenarios. The UE pre-configures multiple activation delay values corresponding to different reception scenarios (same MAC CE vs. different MAC CEs), allowing it to select the appropriate pre-computed value without additional processing delay, thus maintaining reliability while minimizing actual activation time
Data Source
AI summary
A computer-readable storage medium stores instructions to configure a UE for Scell activation in a 5G NR network, and to cause the UE to perform operations including decoding a first MAC CE received from a base station on a PDSCH. The first MAC CE includes a PUCCH SCell activation command. A second MAC CE is decoded, which includes PL-RS configuration information. DL activation process is performed within a pre-configured activation time starting at a first slot of the first MAC CE reception. The availability of a PL-RS is determined based on the PL-RS configuration information. CSLRS measurements are performed in response to the PUCCH SCell activation command. The CSLRS measurements include a path loss calculation performed within an extended time period starting after the DL activation process and having a duration based on the availability of the PL-RS.