TDD Idle Period Alignment for Adjacent Channel Interference
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Solution Overview
Problem
Current techniques for coexistence of different time-division duplex (TDD) technologies in 3GPP cellular communication systems, such as E-UTRA and LCR-TDD, face challenges in reducing interference and optimizing resource use, leading to suboptimal performance and increased costs due to complex frame structure requirements and potential for significant interference between adjacent frequency channels.
Innovation Solution
Introducing idle periods in the transmission schedule of one TDD mode to align with the switching times of another dissimilar TDD mode, allowing for reduced interference and improved resource utilization by ensuring that only necessary portions of the transmission are active, thereby maximizing data throughput and minimizing adjacent channel interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different TDD modes operate on adjacent frequency channels with independent transmission schedules, then each system can optimize its own performance, but significant interference occurs between the systems
Solution Approach 1:
The patent merges the transmission schedules of two dissimilar TDD modes by aligning their idle periods and switching times. This coordination allows both systems to operate simultaneously on adjacent frequency channels while minimizing mutual interference, thus maintaining high data throughput without significant interference penalties.
Solution Approach 2:
The patent applies preliminary anti-action by pre-coordinating the transmission schedules to prevent interference before it occurs. By aligning idle periods and switching times in advance, the system proactively eliminates potential interference between adjacent channels rather than reacting to it after the fact.
2Object-affected harmful factors
If idle periods are introduced to reduce interference, then adjacent channel interference is minimized, but transmission resources are underutilized
Solution Approach 1:
The patent combines the idle periods of two different TDD modes to create a mutually beneficial arrangement. By aligning idle periods from both systems, the idle time for each system is effectively shared, reducing the overall resource waste while maintaining interference reduction benefits.
Solution Approach 2:
The patent applies partial action by introducing idle periods only during specific time intervals when interference would occur, rather than implementing continuous idle periods. This selective approach minimizes interference during critical switching times while maintaining transmission efficiency during other periods.
3Object-affected harmful factors
If frame structures are made complex to accommodate coexistence requirements, then interference management improves, but system complexity increases
Solution Approach 1:
The patent implements periodic action by establishing regular patterns in the frame structures of both TDD modes. By creating periodic alignment of idle periods and switching times, the system achieves effective interference management through predictable, repeating patterns rather than complex ad-hoc adjustments.
Solution Approach 2:
The patent applies parameter changes by adjusting timing parameters such as idle period duration and switching time offsets to optimize coexistence. By modifying these temporal parameters, the system achieves effective interference management while maintaining relatively simple frame structures that can be implemented with standard equipment.
Data Source
AI summary
A cellular communication system comprises first and second serving communication units supporting respective first and second time division duplex (TDD) modes of operation on respective first and substantially frequency-adjacent second frequency channels comprising a plurality of uplink transmission resources divided into uplink timeslots and a plurality of downlink transmission resources divided into downlink timeslots. The first and second modes of TDD operation are dissimilar and communications cover substantially the same or overlapping geographic area. The first serving communication unit transmits a plurality of idle periods in the first mode of operation arranged to encompass a time period used by the second serving communication unit for switching communication between downlink and uplink transmissions of the second mode of operation.