Relay-Assisted Terminal Reception for Stable NR Downlink
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Solution Overview
Problem
In next-generation mobile communication systems like NR, beamforming is susceptible to interference from obstacles, leading to radio link failures and difficulties in constructing non-line of sight communication, with existing control methods for relay apparatuses being inadequate.
Innovation Solution
A terminal and radio communication method that includes a receiving section to receive signals via a relay apparatus and a control section to manage reception based on relay apparatus information and quality, allowing for appropriate UE and network control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beamforming is used in NR systems, then communication coverage can be extended, but radio link failures increase due to obstacle interference and shield effects
Solution Approach 1:
The patent introduces a relay apparatus as an intermediary device between the base station and user terminal. This relay apparatus receives signals from the base station, processes them, and forwards them to the user terminal, thereby extending communication coverage to areas that would otherwise be blocked by obstacles while maintaining signal reliability through controlled signal processing and regeneration
Solution Approach 2:
The communication path is segmented into multiple hops: base station to relay apparatus, and relay apparatus to user terminal. This segmentation allows the system to overcome line-of-sight requirements by using the relay apparatus as an intermediate node that can be positioned to avoid obstacles, thus extending coverage while maintaining link stability
2Area of stationary object
If relay apparatus is introduced to extend coverage, then communication in non-line of sight areas is enabled, but system complexity increases due to additional control requirements
Solution Approach 1:
The relay apparatus is designed with multi-functional capabilities, serving as both a signal receiver from the base station and a signal transmitter to the user terminal. It performs multiple functions including signal reception, processing, forwarding, and quality monitoring within a single device, thereby extending coverage without proportionally increasing overall system complexity
Solution Approach 2:
The relay apparatus implements feedback mechanisms by monitoring reception qualities and reporting to the base station. This feedback enables the base station to adjust transmission parameters and maintain optimal communication performance, managing system complexity through automated control based on real-time conditions
3Loss of information
If periodic CSI transmission is implemented, then channel state information is available for scheduling, but uplink control overhead increases
Solution Approach 1:
The system dynamically changes the CSI transmission parameters based on communication conditions. When the relay apparatus is used, the periodicity and content of CSI transmissions are adjusted to balance information accuracy with overhead reduction, transmitting only necessary channel state information at optimized intervals
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives at least part of DL transmission transmitted from a network, via a relay apparatus; and a control section that controls reception of the DL transmission, based on at least one of information related to the relay apparatus transmitted from the network and reception qualities of a plurality of periods. According to an aspect of the present disclosure, it is possible to appropriately control a terminal and a network even in a case of using a relay apparatus.