PRS Sequence Initialization for Wireless Positioning
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving positioning reference signals (PRS) in next-generation wireless access technologies, particularly in supporting various numerologies and reducing implementation complexity for user equipment (UE) when using channel state information reference signals (CSI-RS) and PRS together.
Innovation Solution
A method and apparatus for generating, transmitting, and receiving PRS in a wireless communication system, where a pseudo-random sequence generator initializes the PRS sequence based on a specific equation, utilizing a PRS sequence ID, and configuring PRS resources, allowing for efficient PRS transmission and reception, especially in new radio (NR) systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS and CSI-RS are used together in next-generation wireless systems, then positioning accuracy and channel state information quality are improved, but implementation complexity for user equipment increases
Solution Approach 1:
The patent segments the PRS resource configuration into distinct parameters including PRS sequence ID, resource set ID, resource ID, and port ID. Each parameter is independently configurable and identified through separate signaling messages, allowing the UE to process each aspect of PRS configuration separately rather than as a monolithic complex structure.
Solution Approach 2:
The network side performs preliminary configuration by pre-defining PRS resource sets and individual PRS resources with specific parameters before transmission. The UE receives and stores these configurations in advance through system information or dedicated signaling, so that when actual PRS transmission occurs, the UE can directly apply the pre-configured parameters without real-time computation, reducing processing complexity.
2Reliability
If multiple PRS resources and resource sets are configured, then positioning reliability and coverage are improved, but signaling overhead and processing burden increase
Solution Approach 1:
The patent employs template-based configuration where PRS resource sets serve as reusable templates containing common parameters. Multiple individual PRS resources can reference the same resource set template, inheriting common configurations. This copying mechanism allows the network to configure multiple PRS resources with consistent parameters through a single template definition, significantly reducing redundant signaling overhead while maintaining the ability to differentiate individual resources through specific parameter overrides.
3Measurement precision
If PRS sequence initialization uses detailed parameters, then sequence orthogonality and positioning accuracy are improved, but calculation complexity increases
Solution Approach 1:
The patent changes the initialization parameters of the pseudo-random sequence generator to use modular arithmetic operations with predefined constants. The sequence initialization formula uses modulo operations on the PRS sequence ID and other parameters, transforming complex floating-point calculations into integer-based modular arithmetic. This parameter transformation maintains the orthogonality properties of the sequences while dramatically reducing the computational burden on the UE.
Data Source
AI summary
Disclosed are a method and an apparatus for supporting same, the method carried out by a terminal in a wireless communication system comprising the steps of: receiving a synchronization signal/physical broadcast channel (SS/PBCH) block comprising a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH); receiving system information on the basis of the SS/PBCH block; receiving information associated with a positioning reference signal (PRS) sequence identifier (ID) after receiving the system information; and receiving a PRS associated with the PRS sequence ID, wherein a pseudo-random sequence generator associated with sequence generation of a PRS is initialized by (I) where M is a natural number, K is the number of orthogonal frequency division multiplexing (OFDM) symbols per slot, (II) is a slot index, (III) is an OFDM symbol index within the slot, (IV) is the PRS sequence ID, and mod is a modulo calculation.