Grant-Free Reference Signal Sequences for 5G Terminal Identification
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently supporting grant-free communication, particularly in identifying terminals and managing grant-free terminal groups for effective data transmission without additional random access processes.
Innovation Solution
The method involves using a sequence of reference signals for terminal identification and group estimation, where terminals receive control information to generate and transmit reference signals and data signals within specific grant-free resource regions, allowing the base station to decode these signals using an Independent Component Analysis (ICA) scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-free communication is implemented without additional random access processes, then transmission efficiency is improved, but terminal identification and group management become more difficult
Solution Approach 1:
The patent uses reference signal sequences as unique identifiers for terminals, analogous to using distinct colors or patterns for identification. Each terminal is assigned a specific reference signal sequence from a codebook, enabling the base station to identify different terminals through their unique signal characteristics without requiring additional random access procedures.
Solution Approach 2:
The patent introduces reference signals as an intermediary mechanism that facilitates terminal identification and group management in grant-free communication. These reference signals serve as a mediator between the terminal's data transmission and the base station's identification process, allowing efficient resource allocation and terminal differentiation without direct interaction.
2Speed
If multiple terminals transmit simultaneously in grant-free mode, then data transmission speed is improved, but collision probability increases
Solution Approach 1:
The patent segments the grant-free resource space by assigning different reference signal sequences to different terminals and terminal groups. This segmentation allows multiple terminals to transmit simultaneously on the same physical resources while maintaining distinguishable signal characteristics, thereby enabling high-speed parallel transmission while reducing collisions through proper sequence allocation and group management.
3Measurement precision
If reference signal sequences are used for terminal identification, then identification accuracy is improved, but sequence management complexity increases
Solution Approach 1:
The patent makes the reference signal sequences multi-functional by using them for both channel estimation purposes and terminal identification purposes. This universal usage of reference signals eliminates the need for separate identification signals, thereby improving identification accuracy while avoiding the additional complexity that would arise from introducing separate identification mechanisms.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method of operating a terminal in a wireless communication system includes receiving control information for grant-free communication from a base station, generating a reference signal by using one sequence among sequences included in sequence set information for the reference signal included in the control information, and transmitting the reference signal and a data signal to the base station by using grant-free resource region information included in the control information. The one sequence may be used to allow the base station to identify the terminal.