SRS Resource Configuration Enhancements for 5G Link Budget
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G and LTE networks, face challenges in efficiently configuring sounding reference signal (SRS) resources, leading to limitations in link budget and capacity for power-limited user equipment (UEs), especially when using repetitions and frequency hopping, which can result in resource wastage and demultiplexing issues.
Innovation Solution
The introduction of new SRS resources and parameters that allow for additional SRS transmissions by non-legacy devices while maintaining backwards compatibility with legacy devices, including flexible configuration of SRS resource sets, power control, and antenna switching, to enhance link budget and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRS repetitions and frequency hopping are used to improve link budget and capacity, then transmission reliability is improved, but resource wastage increases and demultiplexing issues occur
Solution Approach 1:
The patent segments SRS resources into multiple SRS resource sets, where each set can be independently configured for different purposes (e.g., one set for coverage enhancement with repetitions, another for capacity with frequency hopping). This allows the system to optimize each segment for its specific function while avoiding the resource wastage that would occur if all resources used the same configuration.
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where SRS resource sets can be activated or deactivated based on channel conditions and UE capabilities. The network can dynamically select which resource sets to use, enabling flexible adaptation between repetition-based and frequency-hopping-based SRS transmissions, thereby optimizing the balance between reliability improvement and resource efficiency.
2Productivity
If new SRS resources are introduced for non-legacy devices, then link budget and capacity are enhanced, but device complexity increases
Solution Approach 1:
The patent designs SRS resource sets with universal configuration parameters that can serve multiple functions. The same resource set structure can be used for both coverage enhancement and capacity improvement scenarios, allowing non-legacy devices to benefit from enhanced capabilities without requiring entirely separate configuration mechanisms for each function.
Solution Approach 2:
The patent employs parameter-based differentiation where legacy and non-legacy devices are distinguished through specific configuration parameters rather than fundamentally different structures. Non-legacy devices can be configured with additional parameters (such as repetition factors, frequency hopping patterns) that modify the basic SRS resource set structure, enabling enhanced functionality while maintaining compatibility with the core configuration framework.
3Adaptability or versatility
If flexible SRS resource set configuration is implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary configuration where SRS resource sets are pre-defined with standard parameter combinations. The network can select and activate appropriate pre-configured resource sets based on current conditions, rather than requiring complex real-time configuration of all parameters. This reduces the instantaneous configuration complexity while maintaining long-term adaptability.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for sounding reference signal (SRS) resource configuration enhancements. A method generally includes receiving, from the network, a message comprising sounding reference signal (SRS) configuration information, wherein the SRS configuration information comprises configuration information for a first SRS resource set and configuration information for a second SRS resource set and transmitting at least one SRS according to the received SRS configuration information.