Uplink Signal Transmission Using Variable Cyclic Prefix Lengths
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Solution Overview
Problem
In the 5G mobile communications system, unsynchronized uplink signals from different user equipment (UEs) cause interference when transmitted without synchronization, leading to resource and power wastage, especially in mMTC scenarios where UEs send data in an unsynchronized state without network configuration.
Innovation Solution
The user equipment selects a cyclic prefix (CP) of different lengths from a preset candidate set to reduce interference when transmitting unsynchronized uplink signals, with CP selection based on path loss, movement state, or configuration information, allowing for efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If user equipment sends uplink data in an unsynchronized state to save resources and power, then resource consumption and power usage are reduced, but interference between different UEs increases
Solution Approach 1:
The patent applies parameter changes by allowing UEs to select from multiple CP length options (different parameters) in the CP candidate set. By changing the CP length parameter based on path loss and movement state, the system reduces interference while maintaining unsynchronized transmission benefits, thus resolving the contradiction between energy saving and interference reduction.
2Device complexity
If user equipment uses a fixed CP length for uplink transmission, then device complexity is reduced, but interference between unsynchronized signals from different UEs increases
Solution Approach 1:
The patent implements dynamics by enabling UEs to dynamically select CP lengths from a candidate set based on real-time path loss and movement state measurements. This dynamic adaptation allows the system to manage interference effectively without requiring complex centralized coordination, thus resolving the contradiction between simplicity and interference management.
Solution Approach 2:
The system applies self-service by allowing each UE to autonomously select appropriate CP lengths based on its own path loss and movement state measurements. This self-based decision-making mechanism reduces the need for complex network coordination while effectively managing interference, thereby resolving the contradiction between device complexity and interference reduction.
3Object-affected harmful factors
If user equipment performs uplink timing synchronization through random access process, then signal interference is reduced, but resource consumption and power usage increase
Solution Approach 1:
The patent applies segmentation by dividing the CP candidate set into different length categories and assigning them to different UE groups based on path loss and movement state. This segmentation allows targeted interference management without requiring all UEs to undergo full synchronization procedures, thus resolving the contradiction between interference reduction and energy consumption.
Data Source
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AI summary
This disclosure provides an uplink signal transmission method and user equipment and relates to the field of communications technologies. The uplink signal transmission method applied to the user equipment includes: selecting from a preset cyclic prefix CP candidate set a CP to send an uplink transmission signal, where the CP candidate set includes at least two types of CPs of different lengths.