PTRS Sub-carrier Allocation for Phase Noise Control in 5G
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G wireless communication systems, phase noise caused by oscillator imperfections leads to signal attenuation and decreased signal recovery capability, particularly in high-frequency bands using advanced modulation schemes like 16 QAM, 64 QAM, and 256 QAM, due to common phase error and inter-carrier interference.
Innovation Solution
An apparatus and method that determine and allocate a phase tracking reference signal (PTRS) sub-carrier, with a base station transmitting PTRS allocation information to terminals, allowing them to receive and process PTRS through specific sub-carriers, thereby controlling PTRS interference and improving tracking performance in multi-cell environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTRS is transmitted on the same sub-carrier in multi-cell environments, then PTRS tracking performance can be maintained, but interference between neighboring base stations increases
Solution Approach 1:
The patent divides the frequency domain resources by allocating different sub-carriers to different base stations for PTRS transmission. Each base station is assigned a dedicated sub-carrier index based on its cell identifier, preventing overlap and interference between neighboring cells while maintaining tracking performance.
Solution Approach 2:
The patent applies cell-specific sub-carrier allocation where each base station receives a unique sub-carrier index determined by its cell identifier. This local differentiation ensures that each base station's PTRS is transmitted on a dedicated sub-carrier, avoiding interference while maintaining local tracking accuracy.
2Reliability
If PTRS allocation information is not transmitted to terminals, then system complexity is reduced, but terminals cannot accurately track phase noise
Solution Approach 1:
The base station performs preliminary action by determining and signaling the PTRS sub-carrier allocation information to terminals before actual PTRS transmission. This advance notification allows terminals to prepare their phase noise tracking algorithms, improving tracking accuracy without requiring complex real-time decision-making.
Solution Approach 2:
The patent implements a feedback mechanism where the base station transmits PTRS allocation information to terminals, enabling terminals to adjust their phase noise tracking processes accordingly. This feedback loop ensures that terminals have the necessary information to accurately track phase noise while maintaining manageable system complexity.
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). According to various embodiments of the present disclosure, an operating method of a base station includes determining at least one sub-carrier for allocating a phase tracking reference signal (PTRS), transmitting information relating to the PTRS allocation to a terminal, and based on the information, transmitting the PTRS to the terminal through the at least one sub-carrier. An apparatus and a method according to various embodiments of the present disclosure, may determine a sub-carrier for PTRS allocation and provide information relating to the PTRS allocation to a terminal, thus controlling PTRS interference caused from neighboring base stations and improving PTRS tracking performance.