PTRS Allocation in 5G Base Stations Avoiding Reference Signal Collisions
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Solution Overview
Problem
In next-generation communication systems, there is a need for efficient allocation of phase tracking reference signals (PTRS) to ensure smooth communication between adjacent base stations, particularly in scenarios where PTRS collisions with other reference signals occur, affecting phase tracking and data transmission.
Innovation Solution
The proposed solution involves a method where a base station allocates PTRS on resource elements (REs) that do not overlap with other reference signals, allowing for zero power PTRS/data puncturing and rate matching, and exchanging PTRS allocation parameters between serving and adjacent base stations to maintain orthogonality between PTRS and data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PTRS is allocated on resource elements (REs) to enable phase tracking, then phase tracking performance is improved, but collisions with other reference signals occur causing interference and degradation
Solution Approach 1:
The resource elements are segmented and allocated to different reference signals (PTRS, DMRS, CSI-RS) in a non-overlapping manner. The base station divides the time-frequency resource grid into distinct regions for each reference signal type, ensuring that PTRS occupies specific REs while other reference signals occupy different REs, thereby eliminating collisions and enabling accurate phase tracking without interference
Solution Approach 2:
The patent resolves resource conflicts by utilizing multiple dimensions of the resource grid (time domain, frequency domain, and code domain). PTRS is allocated in specific time symbols and frequency subcarriers that do not overlap with DMRS or CSI-RS allocations. This multi-dimensional resource allocation ensures that phase tracking references are obtained without collision interference from other reference signals
2Reliability
If PTRS allocation is optimized for phase tracking, then communication reliability is improved, but resource allocation complexity between serving and adjacent base stations increases
Solution Approach 1:
The base station performs preliminary resource allocation planning for PTRS, DMRS, and CSI-RS before actual transmission. By pre-configuring non-overlapping resource element assignments and establishing coordination rules with adjacent base stations in advance, the system ensures that phase tracking references are reliably obtained without real-time collision resolution complexity during data transmission
Solution Approach 2:
The patent introduces resource allocation coordination as an intermediary mechanism between serving and adjacent base stations. Through backhaul communication, base stations exchange information about their respective reference signal allocations and adjust PTRS resource elements accordingly. This intermediary coordination layer enables reliable phase tracking across cell boundaries while managing allocation complexity through standardized interaction protocols
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.The present disclosure discloses a method and an apparatus for allocating a PTRS in a next-generation communication system.