PTRS Hopping Offset for DMRS Bundled Transmission Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in New Radio (NR) and LTE technologies, face challenges in efficiently processing phase tracking reference signals (PTRSs) across multiple time slots due to static frequency resource allocation, leading to high code rates and reduced channel estimation performance.
Innovation Solution
The proposed solution involves dynamically changing the frequency resources for PTRSs based on a PTRS hopping offset, allowing PTRSs to be allocated on different frequency resources across repetitions. This technique is implemented in both user equipment (UE) and network entities, enabling efficient processing of PTRSs in different transmissions across multiple symbols or time slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static frequency resource allocation is used for PTRSs across multiple time slots, then the system structure is simple, but the code rate becomes high and channel estimation performance deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from static to dynamic frequency resource allocation for PTRSs. The frequency resources are dynamically changed across different transmissions based on a hopping offset pattern, allowing the system to adapt to varying channel conditions and improve channel estimation performance while maintaining manageable complexity through structured hopping rules.
Solution Approach 2:
The patent changes the frequency resource parameter for PTRSs across different transmissions. By varying the frequency allocation according to a hopping offset, the system achieves diversity in frequency domain, which improves channel estimation reliability and reduces code rate without requiring complex processing.
2Reliability
If PTRSs are allocated on the same frequency resources across all transmissions, then the processing is simple, but the diversity is insufficient and code rate increases
Solution Approach 1:
The patent segments the frequency resources for PTRS allocation across different transmissions. Instead of using the same frequency resources for all transmissions, the system divides and reassigns frequency resources based on hopping offsets, creating diversity that improves coherent decoding performance while maintaining efficient code rate.
Solution Approach 2:
The patent introduces frequency diversity by changing the frequency dimension of PTRS allocation. By hopping between different frequency resources across transmissions, the system exploits the frequency domain to improve diversity and coherent decoding performance, effectively adding a dimensional aspect to the transmission strategy.
3Reliability
If frequency resources for PTRSs are changed across transmissions, then diversity improves and code rate decreases, but the processing complexity increases
Solution Approach 1:
The patent implements periodic action through the use of hopping offsets that repeat or cycle across transmissions. The frequency resource changes follow a periodic pattern based on the hopping offset, which provides consistent diversity benefits while simplifying the processing requirements through predictable, repeatable allocation rules rather than complex adaptive algorithms.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communication by a user equipment (UE). The UE receives an indication of a phase tracking reference signal (PTRS) hopping offset from a network entity. The UE may process PTRSs transmitted in different transmissions across multiple symbols or time slots. In one example, processing the PTRSs may include transmitting the PTRSs in uplink (UL) slots. In another example, processing the PTRSs may include monitoring for the PTRSs in downlink (DL) slots. Frequency resources for the PTRSs may change across the different transmissions based on the PTRS hopping offset.