Uplink Reference Signaling for Low-Latency BWP Precoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communications systems face challenges in achieving high reliability and low latency duplex communications due to latency issues associated with switching between bandwidth parts (BWPs), particularly in non-codebook-based wireless communications.
Innovation Solution
The solution involves configuring user equipment (UE) to measure downlink reference signals in a first resource bandwidth, calculate precoding parameters for uplink reference signals in a second resource bandwidth, and transmit these signals using spatial domain transmission filters, allowing for improved precoding determination and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE switches between different bandwidth parts (BWPs) for downlink and uplink communications, then the system can support flexible resource allocation and spectrum utilization, but latency increases due to switching overhead
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with reference signal resources in multiple BWPs before actual communication occurs. The UE stores downlink reference signal resources associated with multiple uplink SRS resource sets in advance, so when switching between BWPs is needed, the precoding parameters are already prepared and can be applied immediately without waiting for real-time measurement and calculation, thereby reducing switching latency while maintaining resource allocation flexibility
2Reliability
If the UE performs real-time precoding calculation for uplink communications in different resource bandwidths, then communication reliability improves, but processing time and latency increase
Solution Approach 1:
The patent implements preliminary action by having the UE pre-associate downlink reference signal resources with multiple uplink SRS resource sets before actual transmission. The UE calculates and stores precoding parameters in advance based on pre-configured reference signals, so when uplink transmission occurs in different resource bandwidths, the UE can directly apply pre-calculated precoding parameters without performing time-consuming real-time calculations, thus maintaining high communication reliability while significantly reducing processing time
Solution Approach 2:
The patent applies copying by having the UE create and store copies of precoding parameters derived from downlink reference signals for use in uplink transmissions across multiple resource bandwidths. Instead of performing unique real-time precoding calculations for each uplink transmission scenario, the UE reuses copied precoding parameter sets that were pre-computed from associated downlink reference signals, thereby reducing processing time while maintaining the reliability benefits of proper precoding
3Productivity
If the system supports multiple resource bandwidths within BWPs for simultaneous downlink and uplink operations, then spectrum utilization improves, but system complexity increases
Solution Approach 1:
The patent applies universality by configuring the UE to handle multiple resource bandwidths within BWPs using a unified precoding framework. The UE is designed to associate downlink reference signal resources with multiple uplink SRS resource sets across different resource bandwidths, allowing the same UE to efficiently manage and switch between multiple bandwidths for both downlink and uplink operations. This multi-functional capability enables improved spectrum utilization across various bandwidths while managing system complexity through a consistent, standardized approach to precoding and resource management
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for systems that use resource bandwidths within one or more bandwidth parts (BWPs). Such resource bandwidths may be configured in one or more BWPs to support relatively fast switching and allow enhanced flexibility for communications within a BWP. Within one or more BWPs, downlink reference signal resources of a first resource bandwidth may be associated with one or multiple uplink resources of a second resource bandwidth, and precoding for uplink communications in the one or multiple uplink resources may be calculated based on the associated downlink reference signal resources. Additionally or alternatively, abeam used for uplink communications may be provided to the UE in transmission control information (TCI). Further, in some cases, multiple disjoint subsets of uplink frequency resources within a resource bandwidth may use different beams, according to an indication provided in TCI.