Variable-Duration Reference Signals for Small Cell Interference Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing variable-duration reference signals, particularly in small cell networks where interference from persistently transmitted common channels reduces system capacity, and existing solutions struggle with dynamic on/off adaptation to support varying traffic demands and quality of service expectations.
Innovation Solution
The implementation of a variable-duration reference signal (VDRS) system that allows for signals of variable duration to be transmitted and received, with the ability to detect the signal even if only a portion of it is captured, facilitating adaptive resource selection and opportunistic transmissions, thereby reducing interference and improving network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common channels are persistently transmitted to maintain timing and frequency synchronization, then synchronization reliability is improved, but system capacity and network efficiency deteriorate due to increased interference
Solution Approach 1:
The patent implements variable-duration reference signals that are transmitted periodically but with adjustable duration and timing offsets. This allows the system to maintain synchronization functionality while reducing the persistent transmission time, thereby lowering interference and improving system capacity.
Solution Approach 2:
The reference signal duration and timing offset are made dynamic rather than fixed. The system can adapt the reference signal parameters based on traffic demands and quality of service requirements, allowing optimization between synchronization reliability and system capacity under different operating conditions.
2Productivity
If small cells are dynamically turned on and off to adapt to traffic demands, then network efficiency and capacity utilization are improved, but timing and frequency synchronization reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring timing offset values and reference signal parameters before small cells are activated. This allows receiving devices to quickly acquire timing and frequency synchronization information when small cells are turned on, reducing the impact of dynamic on/off transitions on synchronization reliability.
Solution Approach 2:
The variable-duration reference signal acts as an intermediary that carries timing and frequency synchronization information. By optimizing the duration and timing offset of these reference signals, the system ensures that synchronization information is reliably transmitted even when small cells are dynamically activated or deactivated.
3Difficulty of detecting and measuring
If reference signals are transmitted with fixed timing aligned to symbol boundaries, then ease of detection and measurement is improved, but adaptability to variable-duration signals deteriorates
Solution Approach 1:
The patent changes the parameters of reference signals by introducing variable duration and timing offsets that are not necessarily aligned to symbol boundaries. This allows the system to support variable-duration signals while maintaining detectability through appropriate parameter selection and configuration.
Solution Approach 2:
The reference signal is segmented into variable-duration portions with configurable timing offsets. This segmentation allows the system to flexibly adjust the reference signal structure to match different traffic patterns and quality of service requirements while maintaining the ability to detect and measure the signals.
Data Source
AI summary
A device, network, and method for providing a variable-duration reference signal. In an embodiment, a method for wireless communications includes determining, by a first device, a starting timing and an ending timing of one or more symbols of a first carrier in accordance with a reference timing for transmission and reception, wherein each of the one or more symbols has a fixed duration; determining, by the first device, a signal of variable duration on the first carrier, wherein the starting timing of the signal of variable duration is offset from the starting timing of any of the one or more symbols of the first carrier in accordance with the reference timing; and transmitting, by the first device on the first carrier, the signal of variable duration, at the starting timing of the signal of variable duration.