SRS Transmission Configuration via Dynamic Signaling
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Solution Overview
Problem
Current wireless communication systems face limitations in dynamically configuring sounding reference signals (SRS) transmission parameters, such as bandwidth and port allocation, which affects channel estimation and scheduling accuracy, particularly in time division duplex (TDD) systems, due to limited triggering information and inflexible scheduling mechanisms.
Innovation Solution
The method involves dynamically signaling SRS configuration information, including transmission bandwidth, ports, comb, and cyclic shift, through higher-layer signaling, such as RRC or MAC control elements, to associate SRS parameters with Physical Downlink Shared Channel (PDSCH) parameters, enabling more flexible and adaptive SRS transmission aligned with downlink reference signals like CSI-RS and DMRS, thereby improving channel measurement and interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS configuration is dynamically signaled through higher-layer signaling, then adaptability and flexibility of SRS transmission are improved, but signaling overhead and complexity increase
Solution Approach 1:
The SRS configuration parameters are segmented into two groups: semi-static parameters configured through RRC signaling and dynamic parameters signaled through MAC CE or DCI. This segmentation allows the system to maintain flexibility for critical parameters while reducing overall signaling overhead by keeping non-critical parameters static.
Solution Approach 2:
The patent implements dynamic SRS configuration where the network can adjust SRS bandwidth, comb offset, and cyclic shift based on current channel conditions and traffic requirements. This dynamic adjustment capability resolves the contradiction by enabling adaptability when needed while allowing the system to revert to static configuration when conditions are stable.
2Measurement precision
If SRS transmission uses a subset of configured ports, then channel estimation accuracy is improved, but resource allocation complexity increases
Solution Approach 1:
Instead of uniformly configuring all SRS ports, the patent applies local quality by selecting specific subsets of ports based on their relevance to current channel conditions. The network can indicate a subset of ports through DCI signaling, allowing focused channel estimation on critical ports while reducing overall complexity.
Solution Approach 2:
The patent implements partial action by configuring more SRS ports than immediately needed, then selecting a subset for actual transmission based on current requirements. This allows the system to maintain the capability for full-port estimation when needed while using only the necessary subset during normal operation, balancing accuracy and complexity.
3Manufacturing precision
If SRS parameters are associated with PDSCH parameters, then scheduling accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent merges SRS parameter configuration with existing PDSCH scheduling signaling. By associating SRS bandwidth, comb offset, and cyclic shift with PDSCH parameters that are already being signaled, the system achieves joint optimization without adding separate signaling channels, thus improving scheduling accuracy while minimizing additional overhead.
Solution Approach 2:
The patent makes existing PDSCH signaling structures multi-functional by embedding SRS configuration information within the same DCI formats used for PDSCH scheduling. This universal approach allows a single signaling mechanism to serve both PDSCH resource allocation and SRS parameter configuration, reducing overall signaling overhead while achieving precise scheduling.
Data Source
AI summary
According to embodiments, a user equipment (UE) receives control information for a first sounding reference signal (SRS). The control information indicates at least a first frequency resource in a carrier, a frequency-domain shift parameter, a PF value, and a frequency-domain offset value. Based on the control information, the UE transmits the first SRS on a first partial frequency sounding resource within the first frequency resource in the carrier. A resource starting physical resource block (PRB) of the first frequency resource is in accordance with the frequency-domain shift parameter. A bandwidth of the first partial frequency sounding resource is based on at least the PF value and a bandwidth of the first frequency resource. A partial frequency sounding resource starting PRB of the first partial frequency sounding resource is based at least on the resource starting PRB of the first frequency resource and the frequency-domain offset value.