Quasi-Continuous Reference Signal Reception in Unlicensed Bands
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, efficiently receiving downlink signals through unlicensed bands is challenging due to intermittent transmission and the need for continuous reference signals, which can lead to performance issues and interference.
Innovation Solution
The method involves configuring a quasi-continuous reference signal transmission scheme, ensuring that the reference signals are transmitted sufficiently and consistently, even in intermittent scenarios, to maintain high performance and prevent interference, by setting conditions such as minimum transmission density and timing windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signals are transmitted continuously in unlicensed bands, then reception reliability is improved, but transmission resource waste increases due to intermittent transmission nature
Solution Approach 1:
The patent applies periodic action by configuring reference signals to be transmitted at specific periodic intervals rather than continuously. The network device configures a time window and minimum density requirement, allowing reference signals to be transmitted periodically at discrete time points (e.g., every N subframes) while maintaining adequate coverage for reception reliability.
Solution Approach 2:
The patent implements dynamics by making the reference signal transmission configuration adaptable to channel conditions and traffic patterns. The network device can dynamically adjust the time window size and minimum density parameters based on current system state, allowing the transmission scheme to optimize between continuity and resource efficiency in real-time.
2Productivity
If reference signals are transmitted with minimum density in intermittent scenarios, then resource efficiency is improved, but signal consistency deteriorates
Solution Approach 1:
The patent ensures continuity of useful action by guaranteeing that reference signals are transmitted with a minimum density within configured time windows. This ensures that even in intermittent transmission scenarios, there is always sufficient reference signal coverage within any sliding time window of size T, maintaining signal consistency for reception.
Solution Approach 2:
The network device performs preliminary configuration by pre-defining time windows and minimum density requirements before actual transmission occurs. This allows the system to prepare appropriate reference signal transmission patterns in advance, ensuring consistency is maintained without requiring real-time complex decisions during transmission.
3Quantity of substance
If reference signals are transmitted sparsely in unlicensed bands, then transmission overhead is reduced, but reception performance decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the density and timing of reference signal transmissions based on configured parameters such as time window size T and minimum density D. By adjusting these parameters, the system finds the optimal balance between reducing transmission overhead and maintaining adequate reception performance for the specific unlicensed band scenario.
Data Source
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AI summary
Disclosed is a method for receiving a downlink signal by a terminal in a wireless communication system from a base station. More particularly, a method for receiving a downlink signal comprises receiving, from a base station, information about a second reference signal being quasi co-located (QCL) and a first reference signal for demodulating a downlink signal; determining the quasi-continuity of the second reference signal on the basis of the average density of the second reference signal, which exists in a window, for determining a quasi-continuity; and receiving the downlink signal from the base station on the basis of the existence of the quasi-continuity of the second reference signal.