PTRS Power Control for 5G mmWave Phase Noise
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Solution Overview
Problem
In 5G wireless communication systems, particularly in mmWave communications, phase noise between transmitter and receiver oscillators leads to reduced transmission reliability due to constellation rotation, necessitating the use of Phase Tracking Reference Signals (PTRS) that require significant transmission resources.
Innovation Solution
A technique where a base station transmits a PTRS in a wide beam transmission at a controlled power level, ensuring that some terminals receive it with sufficient strength for correct reception and others with manageable interference levels, optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PTRS is transmitted at high power to ensure reliable reception by all terminals, then reception reliability is improved, but transmission resource overhead increases and interference to other terminals worsens
Solution Approach 1:
The patent applies local quality by transmitting PTRS at different power levels to different terminals based on their specific channel conditions and requirements. Terminals with better channel conditions receive PTRS at lower power levels, while terminals with poorer channel conditions receive PTRS at higher power levels. This resolves the contradiction by optimizing resource allocation locally for each terminal rather than using a uniform high power level for all terminals.
2Reliability
If a PTRS is transmitted at high power to ensure reliable reception, then reception reliability is improved, but interference to other terminals increases
Solution Approach 1:
The patent implements local quality by assigning different PTRS power levels to different terminals based on their individual channel conditions. Terminals experiencing better channel conditions are assigned lower PTRS power levels, thereby reducing interference to other terminals, while terminals with poorer channel conditions receive higher PTRS power levels to ensure reliable reception. This resolves the contradiction between improving reception reliability and reducing interference.
3Productivity
If transmission resources are reduced for PTRS, then resource efficiency is improved, but reception reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the PTRS power level parameter based on terminal-specific channel conditions, terminal location, and channel quality indicators. This allows the system to optimize the balance between resource efficiency and reception reliability by transmitting PTRS at the minimum necessary power level for each terminal, rather than using a fixed high power level for all terminals.
Solution Approach 2:
The patent implements local quality by customizing PTRS transmission parameters for different terminals based on their specific channel conditions. Terminals with better channel conditions use fewer transmission resources for PTRS, while terminals with poorer channel conditions allocate more resources. This resolves the contradiction by optimizing resource allocation locally for each terminal rather than using a uniform approach.
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). Described is a method for providing a Phase Tracking Reference Signal (PTRS) in a wireless communication system. The method comprises transmitting, by a base station to a plurality of mobile devices, the PTRS in a wide beam transmission at a first power level. The first power level is set such that at least some of the mobile devices receive the PTRS with a sufficiently high signal strength to enable the PTRS to be correctly received and such that at least some of the mobile devices receive the PTRS with a sufficiently low signal strength to enable the PTRS to be processed as manageable interference. A first mobile device may estimate the Signal to Interference plus Noise Ratio (SINR) of the received PTRS, and transmit, to the base station, feedback information based on the estimated SINR. The base station may transmit, to the first mobile device, a narrow beam transmission comprising one or more allocated Resource Elements (REs) configured according to the feedback information. The allocated REs may be configured to (i) be left empty, so as to carry no information, (ii) contain data, or (iii) contain PTRS.