Phase-Tracking Reference Signal Configuration for Initial Phase-Error Control
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Solution Overview
Problem
Conventional wireless communication systems lack efficient techniques for transmitting and receiving phase tracking reference signals (PTRS) at the initial transmission stage, particularly in high-frequency bands like mmWave frequencies, leading to deteriorated initial transmission probability due to phase errors.
Innovation Solution
The method involves configuring PTRS transmission using master information block (MIB), downlink control information (DCI), configured modulation and coding scheme (MCS), scheduled bandwidth, and radio network temporary identifier (RNTI) to set PTRS at the initial transmission stage, utilizing predefined mapping tables to determine PTRS settings based on identified values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional wireless communication systems operate in high-frequency bands (mmWave), then data rate is improved, but phase errors increase leading to deteriorated initial transmission probability
Solution Approach 1:
The patent applies preliminary action by configuring and transmitting PTRS (Phase Tracking Reference Signals) before the initial transmission stage. The base station determines PTRS settings based on MIB parameters (subcarrier spacing, SSB offset, reserved bits) and transmits configuration information to the terminal in advance, enabling the terminal to prepare for phase error compensation before actual data transmission begins, thus improving initial transmission probability in mmWave bands
2Reliability
If PTRS configuration is added to the initial transmission stage, then phase error compensation is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by making existing MIB parameters serve multiple functions. The same MIB parameters (subcarrier spacing, SSB offset, reserved bits) that are already used for basic system configuration are additionally utilized to determine PTRS settings. This allows PTRS configuration to be achieved without adding dedicated configuration fields, thereby improving phase error compensation while minimizing increases in system complexity
Solution Approach 2:
The patent applies self-service by enabling the terminal to autonomously determine PTRS settings based on MIB parameters it has already received and decoded. The terminal uses the identified MIB values to determine whether PTRS is configured and what parameters to use, without requiring additional explicit configuration messages from the base station, thus reducing signaling overhead and system complexity
Data Source
AI summary
A method of operation of a terminal in a wireless communication system includes receiving a synchronization signal block (SSB) from a base station, decoding a master information block (MIB) included in the SSB, identifying a value based on at least one of subcarrier spacing (SCS) of the MIB, subcarrier offset for the SSB, and a reserved bit included in the SSB or MIB, and determining whether setting information related to a phase tracking reference signal (PTRS) is included in a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) for initial connection, based on the identified value.