Cross-PTRS Rate Matching for Multi-TRP Phase Tracking
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Solution Overview
Problem
In wireless communication systems with multiple coordinated transmit receive points (TRPs), overlapping PTRS transmissions between TRPs lead to phase tracking errors, increased data recovery errors, and reduced data throughput due to resource overlap in multi-TRP communications.
Innovation Solution
Implementing cross-PTRS rate matching to avoid overlapping resources associated with PTRS transmissions by coordinating network nodes, mitigating distortion and reducing phase tracking errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TRPs transmit PDSCH with overlapping resources, then system capacity and spectral efficiency are improved, but phase tracking accuracy deteriorates due to PTRS distortion
Solution Approach 1:
The patent segments the resource allocation by introducing separate rate matching patterns for different TRPs. Each TRP's PDSCH is rate-matched independently based on its own PTRS location, preventing interference between TRPs. This segmentation allows multiple TRPs to transmit simultaneously without mutual interference, resolving the contradiction between system capacity and phase tracking accuracy.
Solution Approach 2:
The patent applies preliminary action by configuring rate matching patterns before actual data transmission. The network node determines the PTRS location and configures the rate matching pattern in advance, ensuring that overlapping resources are avoided from the outset. This preliminary configuration enables multiple TRPs to operate simultaneously with accurate phase tracking maintained.
2Device complexity
If PTRS resources are allocated without considering overlapping TRPs, then device complexity is reduced, but data throughput decreases due to phase tracking errors
Solution Approach 1:
The patent implements universality by creating a rate matching pattern that serves multiple purposes: it ensures accurate phase tracking by avoiding PTRS overlap while simultaneously optimizing data throughput by maintaining efficient resource utilization. The same rate matching mechanism handles both TRPs symmetrically, reducing overall system complexity while improving productivity.
3Measurement precision
If cross-PTRS rate matching is implemented, then phase tracking accuracy is improved, but network node complexity increases due to additional configuration processing
Solution Approach 1:
The patent employs feedback mechanisms where the network node receives PTRS configuration information from other TRPs and adjusts its rate matching accordingly. This feedback loop enables accurate phase tracking while the automated configuration process manages complexity by using standardized procedures for exchanging and processing PTRS information between TRPs.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first network node may receive second phase tracking reference signal (PTRS) configuration information for a second PTRS that is associated with a second network node. The first network node may transmit a physical downlink shared channel (PDSCH) that includes a first PTRS that is based at least in part on first PTRS configuration information, the PDSCH being based at least in part on cross-PTRS rate matching and the second PTRS configuration information. Numerous other aspects are described.