SRS Transmit Power Allocation for Fair CSI Measurement
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Solution Overview
Problem
Existing methods for sounding reference signal (SRS) transmission between user equipment and wireless network nodes face challenges such as unfair downlink channel state information (CSI) measurement due to unequal transmit power allocation, unsymmetrical interference situations, and inefficient frequency hopping within allocated physical resource blocks, leading to poor SRS capacity and CSI measurement accuracy.
Innovation Solution
The proposed solution involves determining and allocating transmit power for SRS resources within a resource set based on the number of SRS ports, configuring SRS antennas for antenna switching, and optimizing SRS precoders to address interference, as well as implementing efficient frequency hopping by dividing frequency sounding into multiple sections within physical resource blocks to improve CSI measurement and SRS transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If equal transmit power is allocated to all SRS resources, then power control simplicity is improved, but downlink CSI measurement fairness deteriorates due to unequal SRS port configurations
Solution Approach 1:
The patent applies local quality by differentiating power allocation based on the specific characteristics of each SRS resource. Instead of uniform power allocation, the system calculates individual power levels for each SRS resource based on its port configuration and channel conditions, enabling fair CSI measurement while maintaining manageable power control complexity through resource-specific parameters
2Device complexity
If traditional frequency hopping is used within allocated physical resource blocks, then SRS transmission is simplified, but frequency hopping efficiency deteriorates leading to poor SRS capacity
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands within the allocated physical resource blocks. This segmentation enables more efficient frequency hopping patterns that can switch between subbands, increasing SRS capacity and measurement accuracy while maintaining transmission simplicity through structured subband management
3Adaptability or versatility
If SRS resources are configured for antenna switching, then spatial coverage is improved, but interference management becomes more difficult in unsymmetrical interference situations
Solution Approach 1:
The patent applies asymmetry by acknowledging and adapting to unsymmetrical interference conditions rather than assuming symmetric interference patterns. The system configures SRS resources with different power levels and timing for different antenna ports, creating asymmetric transmission patterns that better manage interference in asymmetric cellular environments while maintaining spatial coverage
Data Source
AI summary
Method, systems and devices for wireless communication. The method includes performing sounding reference signal (SRS) transmission between a user equipment and a network base station by obtaining a first transmit power of a first SRS resource and determining a second transmit power of a second SRS resource based on the first transmit power of the first SRS resource of a same SRS resource set; transmitting N sets of parameters corresponding to a SRS resource set between the network base station and the user equipment; or transmitting M sections of frequency sounding at a symbol between the user equipment and the network base station, wherein each section of the M sections comprises consecutive physical resource blocks (PRBs), M being a positive integer.