Phase-Tracking Reference Signal Transmission With Dynamic RB Offsets
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Solution Overview
Problem
High data requirements for spectrum above 6 GHz frequency in wireless systems face significant propagation loss, especially in outdoor environments due to higher free space path loss.
Innovation Solution
A system and method for ensuring consistent Phase Tracking Reference Signals (PT-RSs) across multiple slots by determining a RB offset value based on scheduled resource blocks and PT-RS density, allowing for efficient transmission and reception of signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If spectrum above 6 GHz frequency is used to meet high data requirements, then bandwidth availability is improved, but propagation loss increases significantly
Solution Approach 1:
The patent changes the frequency parameter to operate above 6 GHz to access larger bandwidth, accepting the trade-off of increased propagation loss. This parameter change enables high data rate requirements to be met while being aware of the associated propagation challenges that need to be addressed through other means.
2Reliability
If PT-RS density is increased to compensate for propagation loss, then signal transmission reliability is improved, but resource overhead increases
Solution Approach 1:
The patent applies partial action by determining PT-RS density based on the number of scheduled resource blocks. Instead of uniformly high density across all scenarios, the system applies PT-RS selectively and proportionally, matching the density to the actual scheduling requirements to achieve necessary reliability without excessive resource overhead.
Solution Approach 2:
The patent makes PT-RS density dynamic by adjusting it according to the number of scheduled resource blocks. The density changes based on scheduling conditions, allowing the system to optimize between reliability and resource overhead in real-time rather than using a fixed configuration.
3Reliability
If RB offset value is dynamically determined based on WTRU-ID modulo operation, then interference randomization is improved, but calculation complexity increases
Solution Approach 1:
The patent applies self-service by using the WTRU-ID itself as the basis for determining RB offset through a modulo operation. Each WTRU autonomously calculates its own offset without requiring external signaling or complex coordination, achieving interference randomization while keeping the calculation simple and efficient.
Data Source
AI summary
A system, method, and device for ensuring a number of Phase Tracking Reference Signal(s) (PT-RSs) are the same for multiple slots. A wireless transmit/receive unit (WTRU) may receive control information including a number of scheduled resource blocks (RBs) then determine a PT-RS density based on the number of scheduled RBs. The WTRU may determine a RB offset value for the WTRU based on a WTRU-ID modulo the maximum RB offset value, where the maximum value for the RB offset value may be based on at least one of the number of the scheduled RBs and the PT-RS density. The WTRU may then transmit or receive a signal with PT-RS based on the RB offset value.