PTRS Frequency Resource Mapping for 5G Base Station Coordination
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Solution Overview
Problem
In 5G wireless communication systems, phase noise between transmitter and receiver oscillators leads to constellation rotation, increasing Bit Error Rate, particularly in higher frequency mmWave communications, and poses a challenge in coordinating multiple base stations to transmit Phase Tracking Reference Signals (PTRS) without collision at the mobile device.
Innovation Solution
The method involves identifying mutually exclusive sets of frequency resources and mapping PTRS information across these resources, allowing multiple base stations to jointly support a mobile device by transmitting PTRS information using unique frequency resources to avoid collisions, with one base station transmitting a zero-power PTRS in the other stations' allocated resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple base stations transmit PTRS using the same frequency resources, then the system complexity is reduced, but signal collisions occur at the mobile device leading to failed phase tracking
Solution Approach 1:
The frequency resources are divided into M mutually exclusive sets, with each base station assigned to a specific set for PTRS transmission. This segmentation prevents signal collisions while maintaining manageable system complexity through structured resource allocation.
Solution Approach 2:
The patent introduces frequency resource dimensioning by creating multiple mutually exclusive frequency sets. This dimensional separation allows multiple base stations to transmit simultaneously without collision, resolving the contradiction between system simplicity and tracking reliability.
2Reliability
If PTRS information is mapped to dedicated frequency resources for each base station, then phase tracking reliability is improved, but frequency resource utilization efficiency decreases
Solution Approach 1:
Frequency resources are segmented into M mutually exclusive sets allocated to different base stations. This ensures reliable phase tracking for each base station while maintaining organized resource structure that can be efficiently managed.
Solution Approach 2:
Each frequency resource set serves multiple purposes: it provides dedicated PTRS resources for phase tracking while also being part of the overall frequency resource pool that can be dynamically allocated. This multi-functionality helps balance reliability with resource utilization efficiency.
3Reliability
If zero-power PTRS is mapped to other base stations' frequency resources, then signal collision is avoided, but the device complexity for managing zero-power signals increases
Solution Approach 1:
The zero-power PTRS mapping is predetermined and configured in advance for each base station's non-dedicated frequency sets. This preliminary configuration avoids signal collisions while the structured approach to managing zero-power signals keeps device complexity manageable through pre-established rules.
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 comprising at least a first base station and a second base station, and a mobile device. The first and second base stations cooperate to jointly support the mobile device. The method comprises identifying at least two mutually exclusive sets of frequency resources. The method further comprises mapping, by the first base station, at least a portion of PTRS information of the first base station to a first set of the frequency resources, mapping, by the first base station, a zero-power PTRS to a second set of the frequency resources, or leaving, by the first base station, the second set of frequency resources empty, and transmitting, by the first base station, a signal comprising the PTRS information of the first base station according to the frequency resource mapping. The method further comprises mapping, by the second base station, at least a portion of PTRS information of the second base station to the second set of the frequency resources, mapping, by the second base station, a zero-power PTRS to the first set of the frequency resources, or leaving, by the second base station, the first set of frequency resources empty, and transmitting, by the second base station, a signal comprising the PTRS information of the second base station according to the frequency resource mapping.