High Speed Terminal Uplink Latency via Distributed RU Configurations
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Solution Overview
Problem
In mobile wireless backhaul networks for high-speed moving objects, there is a significant latency issue in transmitting control information due to the characteristics of uplink-downlink configurations, which hinders efficient communication between base stations and high-speed moving terminals.
Innovation Solution
The implementation of different uplink-downlink configurations for distributed radio units, along with cyclic shift values, allows for the timely processing and transmission of control information through multiple antennas, reducing latency by selecting the appropriate uplink subframe for transmitting control information and adjusting transmission timing using timing advance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If different uplink-downlink configurations are used for distributed radio units, then control information transmission latency is reduced, but system complexity increases
Solution Approach 1:
The base station is divided into multiple distributed radio units (RUs), each capable of operating with different uplink-downlink configurations. This segmentation allows parallel processing of control information through multiple RUs with different configurations, thereby reducing transmission latency while managing complexity through modular deployment
Solution Approach 2:
The system dynamically selects which RU transmits control information based on real-time conditions and processing latencies. Different RUs can switch between different uplink-downlink configurations dynamically, allowing the system to adapt to changing traffic patterns and minimize latency without permanently increasing complexity
2Reliability
If multiple antennas communicate with different radio units, then control information transmission reliability is improved, but signal processing complexity increases
Solution Approach 1:
Multiple antennas are assigned to different radio units, segmenting the signal processing tasks across multiple independent units. Each RU processes signals from its assigned antennas independently, improving reliability through diversity while keeping individual processing complexity manageable
Solution Approach 2:
A centralized controller acts as an intermediary that coordinates between multiple RUs and antennas. It manages the complex signal processing by distributing tasks appropriately and consolidating results, thereby improving reliability through coordinated multi-antenna operation without requiring each individual component to handle excessive complexity
3Productivity
If timing advance values are used to adjust transmission timing, then communication efficiency is improved, but synchronization complexity increases
Solution Approach 1:
Timing advance values are pre-calculated and configured for each RU based on anticipated transmission conditions and processing latencies. This preliminary configuration allows RUs to transmit control information at optimally timed moments without requiring complex real-time synchronization adjustments, improving communication efficiency while managing synchronization complexity through advance planning
Data Source
AI summary
A high speed moving terminal including first and second antennas each communicating with first and second radio units (RUs) of a base station distributedly installed in a mobile wireless backhaul network communicates with the first and second RUs, respectively, with different uplink-downlink configuration of the first RU and the second RU, and transmits control information of the corresponding downlink signal in an uplink subframe that comes first in the time domain after processing latency of a downlink signal received from the first RU among uplink frames with the uplink-downlink configurations of the first RU and the second RU if the downlink signal is received from the first RU through the first antenna.