Overlapping Carrier Allocation for TD-LTE Interference
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Solution Overview
Problem
In communication systems like TD-LTE, the limited bandwidth of 9 MHz leads to inefficient resource utilization and radio wave interference when carriers are arranged to exceed the assigned frequency band, resulting in slower communication speeds and interference with adjacent systems.
Innovation Solution
The system arranges multiple carriers within the 9 MHz band to overlap partially, allowing one base station to preferentially use overlapping radio resources for user data and another for reference signals, adjusting based on Modulation and Coding Scheme (MCS) thresholds to optimize resource allocation and prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two carriers both taking 5 MHz are arranged in succession in the 9 MHz band, then the total bandwidth utilization increases, but the carriers exceed the assigned frequency band causing radio wave interference with adjacent systems
Solution Approach 1:
The 9 MHz band is segmented into multiple 5 MHz carriers that overlap partially. Base stations are assigned different segments of the overlapping portion, with one base station using lower frequency resources and another using higher frequency resources, allowing both carriers to coexist within the 9 MHz band without exceeding it
Solution Approach 2:
Different base stations are assigned different local portions of the overlapping frequency resources. The first base station preferentially uses lower frequency subcarriers in the overlapping region, while the second base station uses higher frequency subcarriers, creating localized quality differentiation that prevents interference
2Object-affected harmful factors
If only 5 MHz in the bandwidth of 9 MHz is used to fit within the assigned band, then radio wave interference is prevented, but communication speed decreases and resource utilization becomes inefficient
Solution Approach 1:
Multiple carriers are merged in the frequency domain with overlapping portions. By combining the resources of multiple carriers and allowing controlled overlap, the system achieves higher total bandwidth utilization (effectively using all 9 MHz) while maintaining interference prevention through coordinated resource allocation
Solution Approach 2:
The resource allocation is made dynamic through preferential usage rules. Base stations dynamically select which frequency resources to use based on the overlapping configuration, allowing the system to adaptively maximize bandwidth utilization while preventing interference
Data Source
AI summary
A communication system having a plurality of base stations for carrying out radio communication by arranging a plurality of carriers each taking a first frequency bandwidth in a second frequency band that is predetermined and to be exceeded by the carriers arranged in succession, wherein the communication system arranges the carriers in the second frequency band in such a manner that each of the carriers has an overlapping portion overlapping with each other, and a first base station for using a carrier A, one of the carriers having the overlapping portion, preferentially uses, over a second base station for using a carrier B, a radio resource of a part of the overlapping portion in assigning user data.