SRS Resource Set Group Switching for Low-Interference Channel Estimation
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Solution Overview
Problem
In wireless communication systems, SRS interference among multiple UEs leads to degraded reception and channel quality, particularly in coherent joint transmission scenarios, due to insufficient interference mitigation and inefficient SRS configuration updates, resulting in high latency and low throughput.
Innovation Solution
Implementing SRS resource set group switching, where a network entity configures multiple groups with different configuration parameters, allowing dynamic adjustment without RRC reconfiguration, by activating specific groups for SRS transmissions, thereby reducing interference and improving channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmissions are configured with high power to enable channel estimation for multiple TRPs, then channel estimation accuracy is improved, but interference to other network entities increases
Solution Approach 1:
The patent implements dynamic SRS resource set group switching where the network entity can activate different groups of SRS resource sets based on current channel conditions and interference levels. This allows the system to adaptively adjust SRS transmission configurations rather than using fixed high-power transmissions, thereby maintaining channel estimation accuracy while reducing interference when conditions permit.
Solution Approach 2:
The patent changes key SRS transmission parameters including periodicity, comb spacing, and resource set group activations. By dynamically adjusting these parameters, the system can optimize the balance between channel estimation quality and interference mitigation, allowing high-power transmissions only when necessary for accurate channel estimation while reducing power and interference during periods when existing configurations suffice.
2Measurement precision
If SRS transmissions are performed frequently to track changing channel conditions, then channel estimation accuracy is improved, but interference and latency increase
Solution Approach 1:
The patent implements dynamic switching between different SRS resource set groups with different periodicities based on current channel conditions. When channels are stable, the system can use longer periodicities to reduce latency and overhead. When channels change rapidly, the system activates resource sets with shorter periodicities to maintain accurate channel estimation, thus adaptively balancing accuracy and latency requirements.
Solution Approach 2:
The patent utilizes periodic SRS transmissions with configurable periodicities for different resource set groups. By switching between groups with different periodicities, the system can match the transmission frequency to the actual channel variation rate, performing frequent transmissions only when necessary to track channel changes while using less frequent transmissions during stable periods to reduce latency and overhead.
3Adaptability or versatility
If multiple SRS resource sets are configured for different TRPs, then channel estimation coverage is improved, but device complexity increases
Solution Approach 1:
The patent segments SRS resource sets into multiple groups, where each group is associated with specific TRPs or channel estimation requirements. The network entity activates only the necessary groups based on current service needs, allowing the system to support multiple TRPs and diverse channel estimation scenarios while managing device complexity through selective activation rather than simultaneous configuration of all possible resource sets.
Solution Approach 2:
The patent creates a universal SRS resource set group structure where groups can be activated based on different service requirements, TRP configurations, and channel conditions. This multi-functional framework allows the same set of resource sets to serve multiple purposes (different TRPs, different periodicities, different comb configurations) through dynamic activation, reducing the need for separate dedicated configurations for each scenario and thereby managing complexity.
4Manufacturing precision
If RRC reconfiguration is used to update SRS parameters, then configuration accuracy is improved, but latency and throughput deteriorate
Solution Approach 1:
The patent pre-configures multiple SRS resource set groups with different parameters (periodicities, comb spacings, associations with TRPs) before actual transmission begins. When channel conditions change or interference levels vary, the network entity can quickly activate a pre-configured group that matches current requirements, avoiding the need for time-consuming RRC reconfiguration procedures and thereby reducing latency while maintaining configuration accuracy.
Solution Approach 2:
The patent implements dynamic switching between pre-configured SRS resource set groups based on real-time channel conditions and interference levels. This dynamic approach allows the system to rapidly adapt to changing conditions by activating appropriate pre-configured groups rather than performing slow RRC reconfiguration, thereby maintaining configuration accuracy while significantly reducing reconfiguration latency and improving throughput.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information, associated with a first sounding reference signal (SRS) resource set, indicating that a first one or more groups of SRS resource sets, from multiple groups of SRS resource sets, are associated with the first SRS resource set. The UE may receive an indication that a first group, from the multiple groups, is activated for SRS transmissions, the first group being included in the first one or more groups that are associated with the first SRS resource set. The UE may transmit an SRS using an SRS resource associated with the first SRS resource set based at least in part on the first group being activated and the first group being included in the first one or more groups. Numerous other aspects are provided.