Early SRS Triggering Signaling During 5G Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing high data traffic demands and supporting various vertical applications, particularly in 5G/NR communication systems, due to limitations in radio interface efficiency and coverage, especially in higher frequency bands like mmWave.
Innovation Solution
Implementing early sounding reference signal (SRS) triggering mechanisms in user equipment (UE) and base stations (BS) to enhance communication efficiency by configuring SRS resources and preambles for random access procedures, allowing for timely transmission of SRS based on specific indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If early SRS triggering is implemented during random access procedure, then communication efficiency and coverage are enhanced, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by configuring SRS resources and preambles in advance before the random access procedure begins. The UE is provided with a configuration of SRS resources and a set of preambles associated with SRS transmission, enabling the UE to transmit SRS early during the random access procedure without requiring additional setup steps, thus improving communication efficiency while managing device complexity.
Solution Approach 2:
The patent implements multi-functionality by using the same random access procedure messages to serve multiple purposes: the message that triggers SRS transmission also carries uplink data or control information. This allows the SRS transmission to be integrated into the existing random access framework without requiring separate dedicated signaling channels, thereby enhancing communication efficiency while minimizing additional device complexity.
2Loss of time
If SRS transmission is triggered by random access message, then timing is optimized for uplink synchronization, but signaling overhead increases
Solution Approach 1:
The patent applies merging by combining the SRS triggering function with the existing random access procedure messages. The message that provides uplink timing adjustment information also triggers the SRS transmission, consolidating multiple functions into a single signaling exchange. This reduces signaling overhead compared to separate SRS triggering mechanisms while maintaining optimized timing for uplink synchronization.
3Adaptability or versatility
If multiple preambles are configured for SRS association, then flexibility and adaptability improve, but device complexity and processing requirements increase
Solution Approach 1:
The patent applies local quality by associating specific preambles from the set with specific SRS resources based on local conditions such as channel quality indicators or beam directions. Each preamble-SRS pair is optimized for particular transmission conditions, providing flexibility and adaptability for diverse wireless environments while keeping the overall processing requirements manageable through localized rather than global optimization.
Data Source
AI summary
Methods and apparatuses for signaling for early sounding reference signal (SRS) triggering. A method of operating a user equipment (UE) includes receiving a configuration for SRS resources and receiving a set of preambles for a random access procedure. The set of preambles is associated with transmission of a SRS when the UE supports transmission of the SRS in response to an indication associated with the random access procedure. The method further includes performing the random access procedure based on the set of preambles, receiving a message as part of the random access procedure that triggers transmission of the SRS, and transmitting the SRS on a SRS resource from the SRS resources in response to the message.