Device Aggregation Diversity Gain via Constrained UE Path Selection
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in providing optimal diversity gain through device aggregation due to limitations in path selection and signal processing between base stations and user equipment (UEs), especially in scenarios involving indirect paths via repeaters.
Innovation Solution
The method involves a wireless device receiving configurations for reference signals on multiple time-frequency resources, measuring these signals to select the best communication path, which can be direct, indirect via a repeater, or a combination of both, and obtaining RF signals through this path, with control information being exchanged between the UE and the base station or repeater to optimize beamforming and power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device aggregation with indirect paths via repeaters is implemented, then diversity gain and signal quality are improved, but device complexity and processing requirements increase
Solution Approach 1:
A repeater is introduced as an intermediary device to establish indirect communication paths between the base station and UE. The repeater receives signals from the base station on first time-frequency resources, processes them, and transmits on second time-frequency resources, enabling UEs with limited capabilities to benefit from diversity gain without directly managing the complexity of multiple path coordination
Solution Approach 2:
The communication path is segmented into multiple independent segments: a direct path from base station to UE, and an indirect path through the repeater. Each segment operates on separate time-frequency resources, allowing the UE to selectively combine signals from different segments based on channel conditions without requiring full processing of all path management functions
2Adaptability or versatility
If multiple time-frequency resources are allocated for reference signals, then path selection capability is improved, but resource consumption and system overhead increase
Solution Approach 1:
The same base station reference signals are reused across multiple time-frequency resources for different purposes: direct path measurement, indirect path measurement via repeater, and channel estimation. This multi-functional use of reference signals enables comprehensive path selection capability without proportionally increasing resource consumption
Solution Approach 2:
Instead of allocating completely separate reference signal resources for each path, the system uses partial resource sharing where the same reference signal configurations are transmitted on multiple resources. This provides sufficient measurement capability for path selection while avoiding excessive resource allocation
Data Source
AI summary
A first wireless device receives, from a base station, a configuration of first reference signals to be transmitted on a first time-frequency resource and a configuration of second reference signals to be transmitted on a second time-frequency resource. The first wireless device measures one of the first reference signals and the second reference signals. The first wireless device switches to measuring the other one of the second reference signals, wherein the first reference signals are measured to generate first measurements and the second reference signals are measured to generate second measurements. The first wireless device obtains a selection of a communication path, for communicating data between the base station and the first wireless device. The first wireless device obtains a first radio frequency (RF) signal from one or more RF signals carried through the communication path.