Default PLRS Selection for Multi-Panel Uplink Pathloss Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications systems, particularly in multi-panel uplink transmissions, the lack of configured pathloss reference signal (PLRS) resources leads to increased signaling overhead and potential degradation of transmission quality and latency due to the inability to transmit necessary reference signals.
Innovation Solution
A user equipment (UE) determines default PLRS resources for multi-panel uplink transmissions based on TRP index values and resource selection rules, selecting PLRS resources even when explicit configurations are absent, using various criteria such as PLRS identifiers, control resource sets, and spatial quasi-co-location relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PLRS resources are configured for multi-panel uplink transmissions, then transmission quality is improved, but signaling overhead increases
Solution Approach 1:
The UE autonomously determines default PLRS resources by itself without requiring explicit network configuration. The UE uses pre-defined rules based on TRP indexes and spatial quasi-co-location relationships to select appropriate PLRS resources, making the system self-configuring and eliminating the need for additional signaling messages from the network.
Solution Approach 2:
The patent changes the parameter selection approach from explicit network-configured PLRS resources to UE-determined default PLRS resources based on TRP indexes and spatial quasi-co-location parameters. This parameter transformation allows the UE to derive appropriate PLRS resources from existing configuration parameters without additional signaling.
2Loss of time
If default PLRS resource selection schemes are implemented, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent establishes pre-defined rules and criteria for PLRS resource selection that are prepared in advance. The UE has pre-configured knowledge of how to select default PLRS resources based on TRP indexes and spatial quasi-co-location relationships, allowing immediate resource determination without waiting for network configuration messages, thus reducing latency.
Solution Approach 2:
The UE copies or reuses existing configuration parameters (TRP indexes, spatial quasi-co-location relationships) to determine PLRS resources. Instead of requiring new dedicated configuration messages, the UE leverages existing parameter sets and applies pre-defined mapping rules, reducing the need for additional complex processing while maintaining accuracy.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify respective transmission/reception point (TRP) index values corresponding to a first TRP and a second TRP, where the UE may be configured for at least a first transmission of an uplink signal to the first TRP using a first antenna panel and a second transmission of the uplink signal to the second TRP using a second antenna panel. The UE may determine default pathloss reference signal (PLRS) resources for one or more PLRSs that are associated with the first transmission and the second transmission of the uplink signal. In some cases, the default PLRS resources may be determined based on a whether PLRSs are configured for the UE, the respective TRP index values, and a resource selection rule. The UE may transmit the one or more PLRSs using the default PLRS resources.