Sidelink Transceiver LBT Across Multiple RB Sets
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G, face challenges in efficiently utilizing unlicensed bands for sidelink communications due to interference and bandwidth limitations, which affect communication throughput and user experience.
Innovation Solution
The implementation of a transceiver apparatus with processors configured to perform listen-before-talk (LBT) procedures across multiple resource blocks (RB) sets in a slot, allowing for the transmission of sidelink communications over contiguous subchannels, and decoding sidelink control information to determine intended data channels, thereby optimizing bandwidth usage and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT procedure is performed over multiple RB sets in unlicensed band, then clear channel access is ensured and interference is minimized, but communication throughput is reduced due to additional access time
Solution Approach 1:
The patent divides the unlicensed band into multiple contiguous subchannels across multiple RB sets, allowing the UE to perform LBT procedures independently on each subchannel or group of subchannels. This segmentation enables parallel access attempts, reducing the total time required for channel access while ensuring clear channel detection before transmission on each subchannel.
Solution Approach 2:
The patent implements dynamic resource allocation where the UE can adaptively select which subchannels to transmit on based on LBT outcomes. The transmission configuration is dynamically adjusted according to channel conditions and LBT success/failure patterns, optimizing the balance between reliable channel access and maintaining high throughput by utilizing available subchannels efficiently.
2Speed
If larger bandwidth is utilized in unlicensed bands, then communication speed is improved, but interference from other systems increases
Solution Approach 1:
The patent segments the wideband unlicensed spectrum into multiple narrower contiguous subchannels across RB sets. This allows the system to utilize large total bandwidth for high speed communication while performing LBT procedures on individual subchannels to detect and avoid interference from other wireless systems operating in the unlicensed band.
Solution Approach 2:
The patent applies different transmission strategies to different subchannels based on local channel conditions and interference levels. Each subchannel can be transmitted on or off independently based on LBT outcomes, allowing the system to maximize throughput on clear subchannels while avoiding interference on occupied subchannels, thus achieving high speed with controlled interference.
3Productivity
If multiple contiguous subchannels are used for sidelink communication, then bandwidth utilization is optimized, but complexity of channel access procedure increases
Solution Approach 1:
The patent combines multiple contiguous subchannels into RB sets for unified resource allocation and control. The UE receives a single sidelink grant from the base station that specifies multiple contiguous subchannels across RB sets, simplifying the channel access procedure by treating them as a unified resource block while still allowing independent LBT execution on each subchannel for optimized bandwidth utilization.
Data Source
AI summary
Some aspects described herein relate to configuring user equipment (UE) for transmitting sidelink communications. A sidelink grant for transmitting sidelink communications over multiple contiguous subchannels across multiple resource block (RB) sets in a slot can be received. A listen-before-talk (LBT) procedure can be performed over the multiple RB sets in the slot. Sidelink communications can be transmitted to one or more other UEs in the multiple contiguous subchannels across at least a subset of the multiple RB sets in the slot for which the LBT procedure succeeds