Dynamic SRS Resource Allocation for Massive MIMO Channel Sounding
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating sounding reference signal (SRS) resources, leading to resource wastage and suboptimal channel sounding performance, especially in massive MIMO deployments.
Innovation Solution
A dynamic SRS resource allocation mechanism where a base station configures a pool of SRS resources with varying quantities of SRS ports, allowing each user equipment (UE) to be allocated resources based on its current transmission rank and operating conditions, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed quantity of SRS ports is allocated to each UE, then the configuration is simple and easy to manage, but resource wastage occurs when the allocated ports exceed the actual transmission rank requirements
Solution Approach 1:
The patent implements dynamic SRS resource allocation where the base station configures multiple SRS resource sets with different quantities of SRS ports, and dynamically selects which resource set to activate based on the UE's current transmission rank and channel conditions. This transforms the static allocation into a dynamic system that adapts to real-time requirements, reducing resource wastage while maintaining manageable complexity through automated selection.
Solution Approach 2:
The patent changes the parameter of SRS port quantity from a fixed value to a variable that can take different values across multiple resource sets. By configuring SRS resources with varying port quantities (e.g., 1 port, 2 ports, 4 ports) and dynamically selecting the appropriate set based on transmission rank, the system optimizes resource usage without significantly increasing operational complexity.
2Productivity
If multiple SRS resource sets with different port quantities are configured, then resource allocation efficiency improves, but the configuration and management complexity increases
Solution Approach 1:
The patent uses dynamic activation of SRS resource sets based on transmission rank indicators. The base station receives RI reports from UEs and automatically activates the corresponding SRS resource set with the appropriate port quantity, making the system adaptive to channel conditions while keeping the activation process automated and manageable through standard control signaling.
Solution Approach 2:
The patent creates a universal SRS resource configuration framework where multiple resource sets with different port quantities are prepared in advance. This multi-functional configuration allows the same UE to use different SRS port quantities depending on its transmission rank, providing versatility without requiring separate configuration procedures for each scenario.
3Reliability
If SRS resources are allocated based on maximum transmission rank, then future transmission requirements are covered, but resource wastage occurs when actual transmission rank is lower
Solution Approach 1:
The patent implements dynamic adaptation of SRS port quantity to match the actual transmission rank through automated base station selection. When the base station receives a RI report indicating a lower transmission rank, it automatically activates the corresponding SRS resource set with reduced port quantity, ensuring both reliability for the current rank and efficiency by avoiding allocation for unused ports.
Solution Approach 2:
The patent changes the SRS port quantity parameter dynamically based on the transmission rank indicator. Instead of fixing the parameter at the maximum value, the system adjusts the port quantity to match the actual transmission requirements, achieving both reliability for current operations and efficiency by eliminating waste for higher ranks that are not currently needed.
Data Source
AI summary
Wireless communications systems and methods related to dynamic sounding reference signal (SRS) resource allocation for channel sounding are provided. A base station (BS) determines a plurality of sounding reference signal (SRS) resources for at least a first user equipment (UE), where a first SRS resource of the plurality of SRS resources includes a different quantity of SRS ports than a second SRS resource of the plurality of SRS resources. The BS transmits, to the first UE, a configuration indicating the plurality of SRS resources.