Adaptive Reference Signal Pattern Selection for D2D
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Solution Overview
Problem
In device-to-device (D2D) communications, the existing LTE standard uses a predefined high-temporal-density reference signal (RS) pattern for all scenarios, leading to inefficient use of radio resources, especially when the radio channel conditions are moderate or improving.
Innovation Solution
A method where a device selects an RS pattern from a set of patterns based on the specific communication conditions, such as channel quality and relative speed between devices, to optimize the amount and placement of RS in the radio signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-temporal-density RS pattern is used in D2D communication, then channel estimation accuracy is improved in worst-case scenarios, but radio resource efficiency deteriorates when channel conditions are moderate
Solution Approach 1:
The patent applies dynamics by making the RS pattern adaptive rather than fixed. The transmitting device dynamically selects from multiple RS patterns with different temporal densities based on detected channel conditions. When channel variations are severe, a high-temporal-density pattern is selected; when variations are moderate, a lower-density pattern is chosen, thus optimizing the balance between reliability and resource efficiency
Solution Approach 2:
The patent changes the parameter of RS temporal density based on channel conditions. Multiple RS patterns are defined with different temporal densities, and the selecting unit chooses the appropriate pattern according to detected channel variation characteristics. This parameter change allows the system to adapt RS density to actual channel conditions rather than always using the worst-case configuration
2Measurement precision
If even higher temporal density RS pattern is used in NR D2D communication, then tracking of channel state in high carrier frequency systems is improved, but radio resource waste increases significantly
Solution Approach 1:
The patent makes the RS pattern dynamic and adaptive to channel conditions. Instead of always using the highest temporal density pattern required for worst-case millimeter-wave scenarios, the system detects actual channel variation characteristics and selects from multiple patterns with different temporal densities. This dynamic adaptation ensures sufficient channel state tracking precision while avoiding excessive radio resource consumption when conditions permit
Solution Approach 2:
The patent changes the temporal density parameter of RS patterns based on detected channel conditions. Multiple patterns are defined with varying temporal densities, and the selecting unit chooses the appropriate pattern according to the severity of channel variations. This allows the system to use higher temporal density only when necessary for accurate channel state tracking, rather than always using the maximum density required for worst-case scenarios
Data Source
AI summary
The invention relates to a method implemented by a device to transmit reference signal, RS, in a device-to-device, D2D, communication in a wireless communication system, the method comprising:—selecting an RS pattern among a set of at least two RS patterns, according to communication conditions:—emitting a radio signal for D2D communication according to the selected RS pattern.