Network-Controlled Repeater Timing with Internal Delay Compensation
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Solution Overview
Problem
Conventional repeaters consume unnecessary power and cause interference due to fixed frequency band forwarding and lack of beam adaptation, leading to inefficiencies in wireless communication systems, particularly in network-controlled repeaters (NCRs) where processing time affects propagation delays and resource conflicts.
Innovation Solution
A method for network-controlled repeaters (NCRs) that involves an initial access procedure with the network, reporting internal delay values, and receiving side control information to accurately determine downlink and uplink timing, thereby optimizing forwarding operations and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional repeaters perform forwarding in the entire forwarding frequency band, then the forwarding coverage is maximized, but unnecessary power is consumed and interference is caused to neighbouring UEs/base stations
Solution Approach 1:
The NCR performs beam adaptation to apply different forwarding operations to different frequency bands or spatial directions. Instead of uniformly forwarding all signals across the entire frequency band, the NCR identifies and forwards only the useful signal components in specific local frequency regions or spatial directions, while suppressing or not forwarding noise components in other regions. This localized approach maintains forwarding coverage in necessary areas while reducing power consumption and interference in unnecessary areas.
2Measurement precision
If NCR performs beam adaptation process for each forwarding resource, then forwarding precision is improved, but processing time increases causing non-negligible internal delay
Solution Approach 1:
The NCR performs beam adaptation in advance for predicted or scheduled forwarding resources. By pre-configuring beam directions, gain settings, and forwarding parameters before actual signal forwarding is needed, the NCR reduces the processing time required during active forwarding operations. This preliminary preparation allows the NCR to quickly switch between different forwarding configurations without incurring significant internal delays, while still maintaining high forwarding precision through adaptive beamforming.
3Measurement precision
If the number of guard symbols is increased to accommodate variable propagation delay, then timing accuracy is improved, but transmission efficiency is reduced
Solution Approach 1:
The NCR dynamically adjusts the number and duration of guard symbols based on the actual measured propagation delay and internal delay conditions. Rather than using a fixed, conservative guard symbol configuration that reduces transmission efficiency, the NCR adapts the guard symbol parameters in real-time to match the actual timing requirements. This dynamic adjustment ensures sufficient timing accuracy for distinguishing downlink and uplink signals while minimizing the overhead imposed by guard symbols, thereby maintaining higher transmission efficiency.
Data Source
AI summary
Provided are a method and device for operating an NCR in a wireless communication system. The NCR reports the internal delay value thereof to a base station, and the downlink transmission timing and uplink reception timing of the NCR with respect to an access link between the NCR and a terminal are determined according to the internal delay value. The base station determines the transmission and reception timing of the NCR in consideration of the internal delay value.