Electronic Device Repeated Transmission After Busy-Channel Detection
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Solution Overview
Problem
In wireless communications on unlicensed frequency bands, user equipment faces challenges in transmitting data when the channel is busy at preconfigured positions, leading to LBT failures and unavailable time domain positions for repeated transmissions.
Innovation Solution
An electronic apparatus and method that allows repeated transmission of transport blocks to start at the first available time domain position after detecting unavailability in the preconfigured positions, using a redundancy version pattern to ensure effective decoding by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment performs idle channel detection at preconfigured time domain positions, then the channel occupation fair competition mechanism can be maintained, but transmission reliability deteriorates when the channel is busy at these positions
Solution Approach 1:
The patent makes the repeated transmission time domain positions dynamic by allowing them to be determined relative to the actual detected available position rather than being fixed in advance. When the first available position is detected at a different time domain position than preconfigured, the repeated transmissions adaptively shift to maintain proper spacing, thus resolving the contradiction between reliability and adaptability
Solution Approach 2:
The patent changes the parameter of time domain position from a fixed preconfigured value to a dynamically determined value based on actual channel detection results. The repeated transmission positions are calculated relative to the detected available position, allowing the system to adapt to varying channel conditions while maintaining transmission reliability
2Productivity
If user equipment waits for preconfigured time domain positions for repeated transmission, then transmission order can be maintained, but transmission efficiency deteriorates due to channel unavailability
Solution Approach 1:
The patent performs preliminary channel detection at preconfigured positions to identify the first available position before determining the actual repeated transmission schedule. This preliminary action allows the system to adaptively adjust transmission timing based on actual channel conditions, improving efficiency by avoiding unnecessary waiting while maintaining proper repeated transmission spacing
Solution Approach 2:
The patent allows the system to skip unavailable preconfigured time domain positions and proceed directly to the first detected available position for repeated transmissions. This skipping mechanism eliminates wasted waiting time on busy channels while maintaining the required repeated transmission structure, thus improving transmission efficiency
3Reliability
If repeated transmissions are performed at fixed preconfigured positions, then resource allocation simplicity is maintained, but communication reliability deteriorates when channels are unavailable
Solution Approach 1:
The patent introduces dynamic determination of repeated transmission time domain positions based on the detected first available position. Instead of using fixed preconfigured positions, the system calculates transmission positions relative to the actual available channel, improving reliability while managing complexity through standardized relative positioning rules
Solution Approach 2:
The patent changes the resource allocation approach from fixed absolute time domain positions to dynamic relative positions based on channel detection results. The repeated transmission positions are determined by adding offsets to the detected first available position, maintaining manageable complexity while significantly improving communication reliability
Data Source
AI summary
An electronic device includes a processing circuit configured to: perform repeated transmission of transmission blocks from among first to (repK)th transmission blocks starting from an nth time domain position when a base station that is due to provide services for an electronic device performs repeated transmission of the first to (repK)th transmission blocks and when it is detected that the nth time domain position is available when the first n−1 consecutive time domain positions from among predetermined consecutive time domain positions configured by the base station and used for repeated transmission are not available; and determine, on the basis of a first redundancy version mode received from the base station, a redundancy version number corresponding to each transmitted transmission block, wherein repK is the first number of repeated transmissions received from the base station, and n is an integer at least one and less than or equal to repK.