Dynamic Time-Frequency Block Allocation for Relay Link Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE and LTE-Advanced systems, the use of a relay device between a base station and a mobile terminal introduces communication delay, which is undesirable and needs to be minimized, especially aiming for delays of 50 ms or less.
Innovation Solution
A base station, communication system, and mobile terminal that include a selection unit to allocate links to frequency-time blocks according to various patterns with different delay characteristics, allowing for dynamic selection of compatible allocation patterns based on required delay characteristics for communication between the base station and the mobile terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay device is provided between base station and mobile terminal to improve signal-to-noise ratio, then communication quality is improved, but communication delay increases
Solution Approach 1:
The patent implements dynamic link allocation patterns that can be switched based on communication conditions. The system dynamically selects between different allocation patterns (first pattern with longer delay for better coverage, second pattern with shorter delay for lower latency requirements) to optimize the trade-off between signal quality and delay characteristics in real-time
Solution Approach 2:
The patent changes the time-frequency resource allocation parameters by implementing multiple allocation patterns. The first allocation pattern uses longer time slots for relay operations to improve signal quality, while the second allocation pattern uses shorter time slots to reduce delay, allowing the system to adjust parameters based on communication requirements
2Reliability
If relay device performs Decode-Forward type relaying to improve signal-to-noise ratio through coding gain, then communication reliability is improved, but processing delay increases
Solution Approach 1:
The system dynamically switches between relay operation modes and allocation patterns based on the required delay characteristics. For applications requiring low delay, the system selects the second allocation pattern that minimizes processing time while maintaining necessary decoding operations for signal quality improvement
3Adaptability or versatility
If multiple link allocation patterns are implemented with different delay characteristics, then adaptability to different communication requirements is improved, but system complexity increases
Solution Approach 1:
The patent segments the resource allocation into distinct, standardized allocation patterns (first and second patterns) with clearly defined characteristics. The selection unit evaluates communication requirements and selects from these pre-defined patterns, making the complexity manageable through structured segmentation rather than arbitrary complex allocation decisions
Data Source
AI summary
A base station is provided with a communication unit for communicating with a mobile terminal via a relay link between the base station and a relay device and an access link between the relay device and the mobile terminal, and a selection unit for selecting an allocation pattern of an uplink of the relay link, a downlink of the relay link, an uplink of the access link, and a downlink of the access link to frequency-time blocks from a plurality of allocation patterns that are different in delay occurring between the base station and the mobile terminal.