SRS Block Configuration for PAPR Control in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring SRS transmission parameters, particularly in managing peak-to-average power ratio (PAPR), which affects resource utilization and communication performance, especially for UEs with varying bandwidths and locations within the network.
Innovation Solution
A method for a user equipment (UE) to receive and transmit control information for SRS transmission, including configuring SRS bandwidth, number of blocks, and block length based on PAPR capability, with the ability to transmit PAPR information through message 3 in the RACH procedure, and applying SRS parameters to each block to maintain a PAPR lower than the required capacity, using techniques like concatenated block SRS for flexible resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRS bandwidth and number of blocks are increased to improve channel sounding coverage, then resource utilization efficiency improves, but peak-to-average power ratio (PAPR) increases beyond acceptable limits
Solution Approach 1:
The SRS transmission is divided into multiple blocks, where each block can be independently configured with specific bandwidth and parameter settings. This segmentation allows the system to distribute the total sounding resources across multiple smaller units, enabling flexible control of PAPR while maintaining overall resource utilization efficiency.
Solution Approach 2:
Different parameter configurations (bandwidth, cyclic shift, root index) are applied to different SRS blocks based on local requirements. This allows optimization of each block's PAPR characteristics while maintaining effective channel sounding across the entire bandwidth, resolving the contradiction between coverage and power ratio.
2Reliability
If SRS parameters are configured to meet strict PAPR requirements, then power management improves, but resource utilization efficiency and channel sounding performance deteriorate
Solution Approach 1:
The system dynamically adjusts SRS parameters (bandwidth, number of blocks, cyclic shift, root index) based on reported PAPR capabilities and current channel conditions. This dynamic configuration allows the system to optimize the balance between PAPR control and resource utilization efficiency in real-time, rather than using fixed conservative settings.
Solution Approach 2:
Multiple SRS parameter configurations are prepared with different PAPR characteristics. The system selects and switches between these configurations based on UE capability reports and network conditions, allowing flexible adjustment of the PAPR-resource utilization tradeoff without being constrained to a single fixed configuration.
3Adaptability or versatility
If concatenated block SRS is used for flexible resource allocation, then adaptability to different UE bandwidths improves, but system complexity increases
Solution Approach 1:
The concatenated block SRS framework provides a universal structure that can accommodate different UE bandwidths, capability types, and deployment scenarios through a single unified mechanism. By using standardized block configurations that can be combined in different ways, the system achieves multi-functionality without requiring separate specialized configurations for each scenario.
Solution Approach 2:
UE reports PAPR capabilities and system requirements are established in advance through standardized procedures. This preliminary information gathering allows the network to pre-determine appropriate SRS block configurations, reducing the complexity of real-time decision-making and enabling efficient adaptive resource allocation.
Data Source
AI summary
A method for a user equipment to receive control information for a sounding reference symbol (SRS) transmission in a wireless communication system may comprise: a step of receiving, from a base station, any one piece of information on an SRS bandwidth (BW), the number of SRS blocks and the length of an SRS block which have been set up for the user equipment; and a step of transmitting an SRS on the basis of the control information.