SRS Power Allocation and Frequency Hopping for Fair CSI
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Solution Overview
Problem
Existing methods for sounding reference signal (SRS) transmission face issues such as unfair downlink channel state information (CSI) measurements due to unequal transmit power allocation, unsymmetrical interference between downlink and uplink, and inefficient frequency hopping distribution, leading to poor SRS capacity and measurement accuracy.
Innovation Solution
The proposed methods involve optimizing transmit power allocation within SRS resource sets based on the number of ports, configuring beam references for symmetrical interference estimation, and implementing efficient frequency hopping techniques to improve SRS transmission efficiency and CSI measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unequal transmit power allocation is used among SRS resources, then SRS transmission flexibility is improved, but downlink channel state information measurement fairness deteriorates
Solution Approach 1:
The patent changes the power allocation parameter from unequal to equal distribution among SRS resources within the same resource set. Specifically, it sets the transmit power of all SRS resources in a resource set to be equal, which eliminates the measurement unfairness caused by power differences while preserving transmission flexibility through other configuration parameters.
Solution Approach 2:
The patent applies equipotentiality by ensuring that all SRS resources within the same resource set operate at the same power level. This creates equal measurement conditions for downlink channel state information, ensuring that no single resource has an unfair advantage due to power differences, thereby achieving fair CSI measurements.
2Device complexity
If downlink and uplink interference characteristics are asymmetrical, then frequency division duplex operation is simplified, but channel state information accuracy deteriorates
Solution Approach 1:
The patent acknowledges and utilizes the asymmetry in interference characteristics between downlink and uplink. It configures SRS resources with specific parameters (such as spatial relation info, beam references) that account for the different interference environments in uplink and downlink, enabling accurate CSI measurement despite the asymmetrical interference conditions in frequency division duplex operation.
3Reliability
If frequency hopping is implemented for SRS transmission, then frequency diversity is improved, but frequency hopping distribution efficiency deteriorates
Solution Approach 1:
The patent implements dynamic frequency hopping for SRS transmission, where the frequency position changes across different time instances. This dynamic approach provides frequency diversity to improve reliability while the hopping pattern is optimized to maintain distribution efficiency, balancing both requirements through configurable hopping parameters.
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.