Dynamic Pilot Pattern Selection for 5G Terminal Mobility
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Solution Overview
Problem
In 5G systems, existing technologies face challenges in flexibly adjusting pilot density and physical resources to accommodate varying movement speeds of terminal devices, leading to high pilot overhead due to fixed pilot density settings.
Innovation Solution
A method that allows terminal and network side devices to determine and adjust pilot patterns and time-frequency resources dynamically based on movement speed and numerology information, enabling flexible pilot density and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed pilot density settings are used, then implementation is simple, but pilot overhead increases and resource efficiency decreases
Solution Approach 1:
The patent implements dynamic pilot density adjustment by introducing multiple pilot patterns with different densities that can be selected based on terminal movement speed. The network device determines the appropriate pilot pattern according to the terminal's movement state, enabling the system to adapt pilot density dynamically rather than using a fixed configuration, thus reducing pilot overhead while maintaining channel estimation accuracy.
Solution Approach 2:
The patent changes the pilot density parameter by defining multiple pilot patterns with different time-frequency resource allocations. Each pilot pattern corresponds to different movement speed scenarios, allowing the system to adjust the pilot density parameter according to actual channel conditions and terminal mobility, thereby optimizing resource efficiency and reducing unnecessary pilot overhead.
2Measurement precision
If high pilot density is used, then channel estimation accuracy improves for high-speed movement, but resource overhead increases
Solution Approach 1:
The patent applies local quality by matching different pilot patterns to different terminal movement speed scenarios. For high-speed terminals requiring high channel estimation accuracy, denser pilot patterns are selected; for low-speed terminals, sparser pilot patterns are used. This localized optimization ensures that each terminal receives the appropriate pilot density for its specific mobility condition, avoiding unnecessary overhead for terminals that don't require high-density pilots.
Solution Approach 2:
The system dynamically selects pilot patterns based on real-time terminal movement speed feedback. The network device adjusts the pilot density according to the terminal's current mobility state, increasing pilot density when high channel estimation accuracy is needed (high-speed movement) and decreasing it when lower accuracy suffices (low-speed movement), thereby optimizing the balance between measurement precision and resource overhead.
3Quantity of substance
If low pilot density is used, then resource overhead decreases, but channel estimation accuracy deteriorates for high-speed movement
Solution Approach 1:
The patent implements dynamic adaptation by allowing the system to switch between different pilot patterns based on terminal movement speed. When a terminal is detected to be moving at high speed, the network device selects a denser pilot pattern to maintain adequate channel estimation accuracy. This dynamic adjustment ensures that pilot density is sufficient for the current mobility condition while avoiding excessive overhead when lower density would suffice.
Solution Approach 2:
The system changes the pilot density parameter adaptively by selecting from multiple predefined pilot patterns with different densities. The network device adjusts this parameter based on terminal mobility feedback, increasing density when channel conditions require higher accuracy (high-speed movement) and decreasing it when the channel is more stable (low-speed movement), thus optimizing the trade-off between measurement precision and resource overhead.
4Device complexity
If pilot density is not adjusted according to movement speed, then configuration is simple, but resource efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic pilot pattern selection based on terminal movement speed to improve resource efficiency. The network device determines the appropriate pilot pattern according to the terminal's mobility state, allowing the system to optimize resource allocation dynamically. This adds moderate configuration complexity but significantly improves resource efficiency by avoiding unnecessary pilot transmissions for low-speed terminals while providing adequate pilot density for high-speed terminals.
Solution Approach 2:
The system changes the pilot density parameter based on terminal movement speed to optimize resource efficiency. By selecting from multiple pilot patterns with different densities, the network can adapt the pilot overhead to actual channel conditions and mobility requirements, thereby improving overall resource utilization efficiency while maintaining necessary channel estimation accuracy for each terminal's specific scenario.
Data Source
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AI summary
The embodiments of the invention disclose a pilot signal transmission method, terminal equipment, and network equipment. The method comprises: terminal equipment determines, from a plurality of pilot patterns, a first pilot pattern; the terminal equipment determines, according to the first pilot pattern, a time-frequency resource used to transmit a pilot signal; and the terminal equipment transmits or receives, using the time-frequency resource, the pilot signal. In the embodiments of the invention, the pilot signal transmission method, terminal equipment, and network equipment can flexibly adjust pilot density and physical resources, thereby reducing pilot overhead.