Directional TRP Transmission for Channel Sensing
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Solution Overview
Problem
In wireless communication systems, especially in multi-TRP environments, channel sensing procedures like Listen Before Talk (LBT) face challenges due to overlapping energy detection threshold ranges, leading to interference and reduced access opportunities for devices, particularly very low power devices, which can be blocked by coordinated transmissions from multiple TRPs.
Innovation Solution
Implementing directional transmission techniques where TRPs coordinate to transmit signals that satisfy energy detection thresholds in directions other than towards the antenna of the TRP performing channel sensing, effectively creating a null in the direction of the sensing TRP to allow successful channel access while blocking very low power devices from accessing the channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TRPs transmit signals in all directions to maximize coverage and throughput, then system productivity and spectral efficiency are improved, but very low power devices may be blocked from channel access due to energy detection threshold exceeded
Solution Approach 1:
The patent applies local quality by creating directional transmission patterns where different spatial regions experience different signal characteristics. TRPs transmit with enhanced signal strength in directions away from sensing TRPs (to maintain productivity) while creating nulls or reduced signal regions in directions toward sensing TRPs (to allow very low power device access). This spatially varying transmission quality resolves the contradiction between maximizing throughput and enabling channel access for low-power devices.
Solution Approach 2:
The patent introduces spatial dimensionality to the transmission problem by using beamforming and directional control. Instead of treating channel access as a uniform scalar problem, the solution operates in the spatial domain by controlling signal distribution across different directions and angles. This dimensional approach allows simultaneous achievement of high throughput in some directions and low interference in others, resolving the access opportunity contradiction.
2Reliability
If TRPs perform coordinated transmissions to block very low power devices from accessing the channel, then channel access reliability for TRPs is improved, but energy consumption increases due to directional signal control
Solution Approach 1:
The patent applies preliminary action by performing channel sensing procedures before actual data transmission. TRPs conduct LBT and directional sensing in advance to identify which directions require blocked access and which allow normal transmission. This preliminary spatial mapping enables subsequent transmissions to be efficiently directed only where needed, avoiding unnecessary energy expenditure while maintaining reliable channel access through pre-planned directional control.
3Reliability
If TRPs transmit at high power in all directions to satisfy energy detection thresholds, then signal coverage and reliability are improved, but interference to sensing TRPs increases and blocks their channel access
Solution Approach 1:
The patent applies anti-weight by creating counterbalancing signal patterns where high-power transmissions in certain directions are compensated by nulls or reduced-power transmissions in other directions. The directional beamforming creates a spatial counterweight effect where signal energy is deliberately redirected away from sensing TRPs while maintaining adequate coverage in service directions. This counterbalancing approach ensures reliable signal detection for served devices without generating harmful interference that would block sensing TRP access.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device may detect that an antenna of a second wireless communication device is to perform a channel sensing procedure on a channel during a time occasion. The first wireless communication device may transmit, during the time occasion in one or more directions other than a direction of the antenna of the second wireless communication device, a signal that satisfies an energy detection threshold. Numerous other aspects are described.