Method and apparatus for transmitting and receiving reference signal in wireless communication system
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Solution Overview
Problem
Conventional wireless communication systems lack efficient techniques for transmitting and receiving phase tracking reference signals (PTRS) during the initial transmission stage, particularly in high-frequency bands like mmWave, leading to deteriorated initial transmission probability due to phase errors.
Innovation Solution
The method involves configuring PTRS transmission in physical downlink or uplink shared channels using MIB, DCI, RNTI, and predefined mapping tables, based on subcarrier spacing, subcarrier offset, and reserved bits, to enable effective phase noise compensation at the initial connection stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional wireless communication systems operate in high-frequency bands (mmWave) to achieve high data rates, then data transmission speed is improved, but phase noise increases causing deteriorated initial transmission probability
Solution Approach 1:
The patent applies preliminary action by transmitting PTRS before the initial data transmission stage. The base station transmits PTRS in the downlink shared channel before the terminal receives downlink data, enabling the terminal to perform phase noise compensation in advance. This preliminary phase tracking action resolves the contradiction by preparing the system for reliable high-frequency transmission before the actual data transfer begins.
2Reliability
If PTRS is transmitted during initial connection stage in high-frequency bands, then phase noise compensation is improved, but system complexity increases due to additional signaling requirements
Solution Approach 1:
The patent applies universality by making the MIB field versatile - it serves both its traditional function of carrying essential system information and an additional function of indicating PTRS transmission parameters. The MIB's reserved bits are repurposed to carry PTRS configuration information, allowing a single signaling element to perform multiple functions. This reduces overall system complexity while maintaining effective phase noise compensation.
Solution Approach 2:
The patent merges the PTRS indication function with the existing MIB signaling structure. Instead of creating a separate signaling mechanism for PTRS configuration, the patent combines PTRS indication with the MIB transmission that already occurs during initial connection. This merging approach reduces signaling overhead and system complexity while achieving the desired phase noise compensation.
3Productivity
If MIB field is used to indicate PTRS transmission parameters, then signaling efficiency is improved, but information capacity of MIB is consumed reducing availability for other parameters
Solution Approach 1:
The patent applies discarding and recovering by utilizing the reserved bits in the MIB field. These reserved bits were previously discarded or left unused, but the patent recovers their potential by assigning them to carry PTRS transmission indication information. This approach efficiently uses available signaling resources without reducing the information capacity needed for other essential parameters.
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.