Timing Advance Segmentation for D2D Signal Efficiency
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Solution Overview
Problem
In Device to Device Proximity Service (D2D ProSe) for LTE systems, existing timing advances often result in unnecessary waste as they are integral multiples of the extended cyclic prefix length, leading to inefficient signal transmission.
Innovation Solution
A method where a base station determines and transmits an appropriate timing adjustment indication to user equipment, allowing the scheduling assignment signaling to carry more useful information by adjusting the timing advance based on specific time intervals, thereby avoiding waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If timing advance is set as an integral multiple of extended cyclic prefix length, then signal transmission can be simplified and standardized, but information efficiency deteriorates due to unnecessary waste of bits
Solution Approach 1:
The timing advance parameter is segmented into two parts: an integer part (multiple of extended cyclic prefix length) and a fractional part (remaining time adjustment). This segmentation allows the integer part to maintain standardization while the fractional part captures the precise timing adjustment needed, eliminating information waste.
Solution Approach 2:
The patent changes the parameter representation from a single integer multiple to a composite parameter including both integer multiple and fractional components. This parameter change enables more precise timing control while maintaining the standardized structure of the integer portion.
2Device complexity
If timing advance uses fixed integral multiples of extended cyclic prefix, then device complexity is reduced, but transmission precision deteriorates
Solution Approach 1:
The timing advance is divided into a standardized integer component (multiple of extended cyclic prefix) for simple device implementation and a fractional component for high precision adjustment, resolving the contradiction between device complexity and timing precision.
Solution Approach 2:
The patent introduces dynamic fractional adjustment to the static integer-based timing advance structure, allowing the system to adapt to precise timing requirements while maintaining the simplicity of the underlying standardized structure.
Data Source
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AI summary
Embodiments of the present invention provide a method for transmitting information, a base station, and a user equipment, where the method includes: determining, by a user equipment, a timing advance T of a signal before sending the signal; determining, by the user equipment, an indication N of a timing adjustment according to at least the T; and sending, by the user equipment, scheduling assignment signaling that carries the N. By using allocation of non-identical time-frequency resources to different user clusters, the scheduling assignment signaling that carries the timing advance sent by the user equipment can bear more useful information, thereby avoiding unnecessary waste.