Flexible Reference Signal Allocation for V2X Channel Estimation
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Solution Overview
Problem
Existing reference signal transmission methods in V2X communication systems are inflexible and inefficient, leading to resource wastage due to fixed allocation of symbols for reference signals, especially when vehicle speeds are low.
Innovation Solution
A method where a sending device indicates a flexible resource for transmitting or receiving reference signals using control information, allowing dynamic adjustment based on factors like speed and location, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed four symbols are used to transmit reference signals in all frequency domain resources, then channel estimation can be completed even when vehicle runs at highest speed, but resources are wasted when vehicle speed is relatively low
Solution Approach 1:
The patent applies dynamics by making the reference signal transmission configurable rather than fixed. The network device can dynamically adjust whether to transmit reference signals based on actual channel conditions and vehicle speed requirements, allowing the system to adapt between fixed allocation (for high speed/reliability) and flexible allocation (for low speed/resource efficiency).
Solution Approach 2:
The patent changes the parameter of reference signal allocation from fixed to flexible. By introducing configurable parameters that allow dynamic adjustment of reference signal transmission resources, the system can optimize the balance between channel estimation reliability and resource consumption based on actual vehicle speed and channel conditions.
2Reliability
If fixed four symbols are used to transmit reference signals, then channel estimation is ensured for high-speed vehicles, but flexibility of sending reference signals is reduced
Solution Approach 1:
The patent introduces dynamic configurability for reference signal transmission through the network device. Instead of a static fixed allocation, the system can dynamically determine whether to transmit reference signals and how many symbols to allocate, thereby achieving both reliability for high-speed scenarios and flexibility for varying conditions.
Solution Approach 2:
The patent makes the reference signal transmission mechanism universal by designing it to handle multiple scenarios through a single flexible framework. The network device can configure reference signal transmission for different vehicle speeds, channel conditions, and resource availability, making the system adaptable to various operational requirements without requiring separate fixed mechanisms.
3Measurement precision
If all frequency domain resources in four symbols are used to transmit reference signals, then channel estimation accuracy is maintained for high-speed movement, but quantity of transmission resources increases
Solution Approach 1:
The patent changes the parameter of resource allocation from fixed (all frequency domain resources in four symbols) to flexible and configurable. The network device can adjust the number of symbols and frequency resources allocated to reference signals based on actual vehicle speed and channel conditions, reducing resource consumption when high estimation accuracy is not required.
Solution Approach 2:
The patent applies partial action by allowing the system to allocate only the necessary portion of frequency domain resources to reference signals based on actual needs. Instead of always using all available frequency resources, the network device can configure partial allocation that matches the channel estimation requirements for the current vehicle speed and conditions.
Data Source
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AI summary
A reference signal sending or receiving method and system, a terminal device, and an access network device are provided. The method includes: sending, by a first device, first control information to a second device, where the first control information is used to indicate a first resource used by the first device to send a reference signal; and sending, by the first device, the reference signal to the second device on the first resource. A transmission resource of the reference signal is no longer fixed, and a quantity of transmission resources, locations of the transmission resources, or the like may be determined based on factors such as a speed of the terminal device. For example, when the speed is low, a relatively small quantity of resources may be configured for sending the reference signal. In addition, the transmission resource of the reference signal is indicated by the first control information, so as to improve flexibility of sending the reference signal.