Uplink Carrier Selection for NR-U Random Access
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Solution Overview
Problem
Current wireless communication technologies face degraded random access performance in NR-U scenarios due to the inability of terminal devices to effectively distinguish between licensed and unlicensed spectrum carriers, leading to poor uplink random access performance, especially in Scenario D of NR-U, as they only consider coverage ratios without accounting for channel availability factors.
Innovation Solution
A wireless communication method that allows terminal devices to determine and send target uplink channels on either licensed or unlicensed spectrum carriers, considering both coverage ratios and channel availability factors, thereby improving random access performance by dynamically selecting the most suitable carrier for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If terminal devices only support random access through licensed spectrum carriers, then device complexity is reduced, but random access performance deteriorates
Solution Approach 1:
The patent enables terminal devices to dynamically select between licensed and unlicensed spectrum carriers for random access based on channel conditions and availability. This dynamic adaptation allows the system to optimize random access performance by switching carriers according to real-time spectrum conditions, resolving the contradiction between device complexity and access reliability.
Solution Approach 2:
The patent changes the parameter of spectrum type from fixed (licensed only) to variable (licensed or unlicensed), allowing terminal devices to adapt to different spectrum conditions. This parameter change enables improved random access performance by selecting the most suitable carrier type based on channel availability and coverage requirements.
2Device complexity
If terminal devices only consider coverage ratio for carrier selection, then decision complexity is reduced, but transmission reliability deteriorates in unlicensed spectrum
Solution Approach 1:
The patent introduces channel availability as an additional selection parameter alongside coverage ratio. This multi-parameter approach allows terminal devices to comprehensively evaluate both licensed and unlicensed carriers, considering spectrum availability and coverage conditions to make optimal carrier selection decisions that improve uplink transmission reliability.
Solution Approach 2:
The patent implements feedback mechanisms where terminal devices monitor channel conditions and availability on both licensed and unlicensed carriers, using this feedback information to dynamically adjust carrier selection. This feedback-driven approach ensures reliable uplink transmission by adapting to real-time spectrum conditions.
3Productivity
If terminal devices use unlicensed spectrum carriers for random access, then spectrum utilization is improved, but channel availability uncertainty increases
Solution Approach 1:
The patent changes the carrier selection from licensed-only to include unlicensed spectrum options, thereby improving spectrum utilization. By evaluating channel availability as a key parameter, the system can effectively use unlicensed carriers when available, increasing overall productivity while managing the uncertainty through informed selection.
Solution Approach 2:
The patent performs preliminary channel listening and availability assessment before selecting unlicensed spectrum carriers for random access. This preliminary action reduces channel availability uncertainty by verifying spectrum conditions in advance, ensuring that unlicensed carriers are only selected when channel availability is confirmed.
Data Source
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AI summary
Provided are a wireless communication method and device. The method comprises: a terminal device determines a carrier using a licensed spectrum or a carrier using an unlicensed spectrum as a target uplink carrier; the terminal device sends a target uplink channel on the target uplink carrier. According to embodiments of the present application, after determining a carrier using a licensed spectrum or a carrier using an unlicensed spectrum as a target uplink carrier, the terminal device sends a target uplink channel on the target uplink carrier, which can support to send the uplink channel on a carrier using an unlicensed spectrum or a carrier using a licensed spectrum.