UE Spatial Layer Signaling for Local Repeater MIMO
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Solution Overview
Problem
Current 5G New Radio (NR) technology faces limitations in optimizing communication performance between User Equipment (UE) and base stations, particularly in managing interference and efficiently utilizing time-frequency resources for local communications involving repeaters, which affects data transmission rates and reliability.
Innovation Solution
The proposed solution involves the UE informing the base station of its maximum supported spatial layers for local communications, allowing the base station to allocate suitable time-frequency resources and determine a MIMO configuration, thereby enhancing communication performance by forming a high-rank MIMO system with low-rank repeaters and managing interference effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station allocates time-frequency resources for local communications between UE and repeaters, then communication performance is improved, but resource management complexity and interference management difficulty increase
Solution Approach 1:
The base station acts as an intermediary that coordinates resource allocation between the UE and repeaters. It receives capability indicators from the UE, determines appropriate MIMO configurations, and allocates time-frequency resources centrally, thereby managing the complexity at the network side rather than requiring complex distributed coordination among multiple devices.
Solution Approach 2:
The base station adjusts MIMO configuration parameters (number of spatial layers L2 ≤ L1) based on the UE's capability indicator and channel conditions. By dynamically changing these parameters, the system optimizes communication performance while managing resource allocation complexity through centralized control.
2Productivity
If the base station determines MIMO configuration based on UE capability indicator, then data transmission rate is improved, but system complexity increases
Solution Approach 1:
The UE provides a capability indicator in advance that specifies the maximum number of spatial layers (L1) it can support. The base station uses this pre-provided information to determine the appropriate MIMO configuration (L2 ≤ L1), thereby enabling high data transmission rates without requiring complex real-time negotiations or assessments of UE capabilities.
3Reliability
If local communications are established between UE and repeaters, then communication reliability is improved, but interference management becomes more difficult
Solution Approach 1:
The base station serves as a mediating entity that coordinates the local communications between UE and repeaters. It centrally manages the allocation of time-frequency resources and MIMO configurations, thereby controlling and managing interference impacts without requiring complex distributed interference coordination among the communicating devices.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives an allocation of time-frequency resources from a base station for local communications between the UE and one or more repeaters, as well as a maximum transmission power for these local communications. Furthermore, the UE transmits data signals to the base station or receives data signals from the base station through the allocated time-frequency resources for local communications.