Base Station LBT Parameter Adjustment for Unlicensed Band Uplink
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Solution Overview
Problem
In wireless communication systems supporting unlicensed bands, existing technologies face challenges in efficiently adjusting downlink Listen-Before-Talk (LBT) parameters for multi-channel transmission, leading to suboptimal uplink transmission performance.
Innovation Solution
A method for a base station to adjust downlink LBT parameters by performing LBT on multiple carriers and adjusting contention window sizes based on uplink transport block success rates, allowing for efficient multi-channel LBT and uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses fixed LBT parameters for downlink transmission on unlicensed bands, then the implementation is simple, but the uplink transmission performance is suboptimal
Solution Approach 1:
The base station adjusts downlink LBT parameters based on feedback from uplink transmission results. Specifically, the base station monitors uplink transport block success rates and uses this feedback to dynamically adjust downlink contention window sizes, creating a closed-loop system that improves uplink performance while maintaining manageable complexity through rule-based adaptation
Solution Approach 2:
The patent implements dynamic adjustment of LBT parameters, specifically contention window sizes, based on observed transmission conditions. When uplink transport block success rate falls below a threshold (e.g., 10%), the base station increases downlink CWS values; when success rate exceeds the threshold, the base station resets CWS values. This parameter adaptation resolves the contradiction by transforming fixed parameters into conditionally variable ones
2Productivity
If the base station performs LBT on multiple carriers with independent parameter adjustment, then the multi-channel transmission efficiency is improved, but the control complexity increases
Solution Approach 1:
The patent applies segmentation by performing independent LBT operations on each carrier and adjusting LBT parameters separately for different carriers based on their specific transmission conditions. This allows the system to optimize each carrier's transmission efficiency independently while maintaining overall system coordination through unified feedback mechanisms
Solution Approach 2:
The base station implements a universal LBT parameter adjustment mechanism that works across multiple carriers simultaneously. The same feedback-based adjustment logic (monitoring uplink success rates and adjusting downlink CWS) is applied universally to all carriers, reducing control complexity through standardized procedures while achieving carrier-specific optimization
Data Source
AI summary
Disclosed are a method for adjusting a downlink listen-before-talk (LBT) parameter by a base station, in a licensed assisted access (LAA) system for execution of LBT-based signal transmission by a base station or a terminal, and a device for supporting same. More particularly, disclosed are a method for uplink operation by a terminal, in a multi-carrier environment, a method for uplink transmission on the basis of same, and a device for supporting the methods.