Uplink SRS Selection for Channel Sensing in 60 GHz Bands
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Solution Overview
Problem
In high radio frequency unlicensed bands, such as 60 GHz, user equipment (UE) face challenges in performing uplink transmissions with multiple sounding reference signals (SRSs), requiring efficient methods to determine the appropriate spatial relation for channel sensing and transmission.
Innovation Solution
A communication device is configured to select a suitable SRS from a plurality of SRSs, perform a channel sensing procedure via a spatial relation associated with the selected SRS, and then conduct an uplink transmission based on the sensing result, utilizing techniques like directional-sensing listen-before-talk procedures to optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SRSs are configured for directional transmission in high frequency unlicensed bands, then the adaptability of the transmission system is improved, but the device complexity increases
Solution Approach 1:
The patent segments the multiple SRS configurations into distinct spatial relations, each associated with specific transmission directions. The UE performs channel sensing independently for each spatial relation, allowing the system to handle multiple directions without treating them as a single complex operation. This segmentation reduces the perceived complexity by breaking down the multi-directional transmission problem into manageable independent sensing and transmission units.
Solution Approach 2:
The patent introduces dynamic selection mechanisms where the UE can adaptively choose which spatial relation to use based on real-time channel conditions and sensing results. The network can also dynamically configure and reconfigure SRS resources and spatial relations. This dynamic approach allows the system to maintain high adaptability while reducing complexity by only activating necessary spatial relations rather than maintaining all configurations simultaneously.
2Reliability
If channel sensing procedure is performed for each spatial relation, then the reliability of uplink transmission is improved, but the loss of time increases
Solution Approach 1:
The patent implements preliminary channel sensing procedures where the UE performs sensing operations in advance before actual uplink transmission. By conducting sensing beforehand and caching the results, the system ensures reliable transmission decisions are made based on current channel conditions without delaying the actual data transmission. This preliminary action separates the sensing time from the transmission time, maintaining reliability while minimizing time loss.
Solution Approach 2:
The patent employs periodic channel sensing where the UE performs sensing at regular intervals rather than continuously. This periodic approach allows the system to maintain reliable transmission by updating channel knowledge at appropriate intervals while avoiding excessive sensing operations that would waste time. The periodic sensing schedule is optimized to balance between keeping channel information current and minimizing the time overhead associated with sensing.
Data Source
AI summary
A communication device for handling an uplink (UL) transmission with a plurality of sounding reference signals (SRSs) comprises at least one storage device; and at least one processing circuit, coupled to the at least one storage device. The at least one storage device stores instructions, and the at least one processing circuit is configured to execute the instructions of: selecting a SRS from a plurality of SRSs; performing a channel sensing procedure via a spatial relation associated with the SRS, to obtain a result; and performing an UL transmission via the spatial relation to a network according to the result.