SRS Beam Probing with Tiered Periodicity for High-Band Resource Sharing
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Solution Overview
Problem
The existing methods for allocating SRS resources in high-band deployments with hybrid beamforming are resource-inefficient and costly, particularly when multiple UEs need to be served, as there is a finite number of SRS resources available, limiting the number of UEs that can be assigned at any given time.
Innovation Solution
A method where UEs are configured with SRS resources for their serving beam and candidate beams with different periodicities, with the serving beam being probed more frequently than candidate beams, allowing for efficient resource sharing and allocation among UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRS resources are allocated to all candidate beams for each UE, then beam coverage and reliability are improved, but resource consumption increases and fewer UEs can be served
Solution Approach 1:
The patent segments SRS resources into two distinct types: Type 1 resources for serving beams and Type 2 resources for candidate beams. This segmentation allows the system to allocate resources differently based on beam status, ensuring that serving beams receive sufficient resources while candidate beams receive minimal resources, thereby resolving the contradiction between comprehensive beam coverage and resource consumption.
Solution Approach 2:
The patent applies local quality by assigning different resource allocation qualities to different beam types. Serving beams receive high-quality resource allocation (Type 1) with adequate periodicity and resources, while candidate beams receive low-quality resource allocation (Type 2) with reduced periodicity and resources. This differentiated approach ensures critical beams are well-supported while minimizing overall resource consumption.
2Measurement precision
If SRS resources are allocated frequently to track channel changes, then channel estimation accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent implements dynamic resource allocation where the SRS resource type (1 or 2) and periodicity are adjusted based on the beam's current status and channel conditions. Serving beams receive more frequent Type 1 resources for accurate tracking, while candidate beams receive less frequent Type 2 resources. This dynamic adaptation maintains measurement precision for critical beams while reducing overall resource overhead.
Solution Approach 2:
The patent applies partial action by allocating full SRS resources (Type 1) only to serving beams where accurate channel estimation is critical, and reduced resources (Type 2) to candidate beams where less frequent measurement is sufficient. This selective resource allocation maintains necessary measurement precision while avoiding excessive resource consumption across all beams.
3Productivity
If multiple UEs are served simultaneously, then network throughput is improved, but the number of available SRS resources per UE decreases
Solution Approach 1:
The patent creates universal Type 2 SRS resources that can serve multiple candidate beams across multiple UEs. These resources are configured with longer periodicity and can be shared among UEs for their respective candidate beams, allowing the system to support multiple simultaneous UEs while maintaining adequate resource allocation through efficient resource sharing and multi-functionality.
4Measurement precision
If SRS periodicity is reduced to track fast fading, then channel tracking accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent implements dynamic periodicity adjustment where Type 1 SRS resources for serving beams use shorter periodicity to track fast fading accurately, while Type 2 SRS resources for candidate beams use longer periodicity. This dynamic differentiation ensures channel tracking accuracy for critical serving beams while minimizing resource overhead for candidate beam monitoring.
Data Source
AI summary
A method (700) performed by a UE (102). The method includes receiving first sounding reference signal, SRS, configuration information, SRS-CI, the first SRS-CI comprising: first SRS resource information, SRS-RI, associated with a first beam and second SRS-RI associated with a second beam, wherein the first SRS-RI specifies a first periodicity and the second SRS-RI specifies a second periodicity that is longer than the first periodicity. The method also includes transmitting to a serving base station (104) a first plurality of SRSs in accordance with the first periodicity specified by the first SRS-RI. The method also includes transmitting to the serving base station a second plurality of SRSs in accordance with the second periodicity specified by the second SRS-RI.