SRS Resource Bundling for Uplink Channel Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving uplink signals, particularly in managing sounding reference signals (SRS) due to increased data traffic and the need for higher transmission rates, which leads to resource shortages and higher latency.
Innovation Solution
The method involves configuring SRS resources and transmitting SRS and uplink demodulation reference signals (DMRS) on the same antenna port or spatial domain transmission filter, allowing for time domain bundling and flexible symbol allocation to reduce signaling overhead and prevent collisions with other uplink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sounding reference signal resource sets are configured separately, then channel estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple SRS resource sets into a single resource set with multiple resource elements. Instead of configuring separate resource sets for different channel estimation purposes, the system creates one resource set containing multiple SRS resources that can be selectively triggered. This merging approach maintains the ability to perform accurate channel estimation across multiple resources while significantly reducing the signaling overhead associated with configuring and managing multiple separate resource sets.
Solution Approach 2:
The unified SRS resource set serves multiple functions simultaneously. A single resource set can support periodic SRS transmission, aperiodic SRS triggering via DCI, and channel estimation for multiple antenna ports or spatial domains. This multi-functional design eliminates the need for separate dedicated resource sets for each function, thereby reducing overall system complexity and signaling requirements while maintaining measurement precision.
2Reliability
If aperiodic sounding reference signal is transmitted repeatedly, then channel estimation reliability is improved, but time consumption increases
Solution Approach 1:
The system introduces dynamic triggering mechanisms where the base station can selectively activate SRS resources based on current channel conditions and estimation needs. Rather than transmitting aperiodic SRS repeatedly by default, the system dynamically adjusts transmission based on actual requirements, allowing the terminal to transmit SRS only when needed and reducing unnecessary time consumption while maintaining reliability when required.
Solution Approach 2:
The patent enables flexible configuration of SRS transmission parameters including timing, frequency, and spatial domain characteristics. By allowing dynamic adjustment of these parameters, the system can optimize the balance between transmission reliability and time efficiency, transmitting SRS multiple times when high reliability is needed and reducing transmission frequency when time is critical, thereby adapting to different operational scenarios.
3Adaptability or versatility
If sounding reference signal and uplink demodulation reference signal are transmitted on separate antenna ports, then transmission flexibility is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent combines SRS and UL-DMRS transmission into the same time resource and antenna port. By multiplexing these two reference signals in the time domain within the same slot, the system achieves efficient resource utilization while maintaining transmission flexibility. The base station can configure the terminal to transmit both SRS and UL-DMRS in the same slot using the same antenna port, eliminating the need for separate resource allocations and improving overall productivity.
4Measurement precision
If more resources are allocated for sounding reference signal, then channel estimation accuracy is improved, but uplink data transmission efficiency decreases
Solution Approach 1:
The system allows the terminal to transmit SRS resources selectively rather than requiring full resource allocation. The base station can trigger specific SRS resources based on actual channel estimation needs, using only the necessary portion of allocated resources. This partial action approach maintains sufficient channel estimation accuracy for effective uplink data transmission while minimizing the overhead and opportunity cost of reserving excessive resources, thereby improving overall uplink data transmission efficiency.
Data Source
AI summary
A method and an apparatus for transmitting and receiving an uplink signal in a wireless communication system. A method of transmitting an uplink signal includes receiving configuration information related to a sounding reference signal (SRS) from a base station; and transmitting the SRS to the base station in one or more SRS resources in a SRS resource set configured by the configuration information. Based on time domain bundling between the SRS and an uplink demodulation reference signal (DMRS) being indicated, the SRS and the uplink DMRS are transmitted on the same antenna port and/or with the same spatial domain transmission filter.