Unlicensed-Band Downlink Scheduling for SS/PBCH System Information
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving downlink signals in unlicensed bands, particularly in managing synchronization signals and system information transmission.
Innovation Solution
The method involves transmitting physical downlink control channel (PDCCH) and physical downlink shared channel (PDSCH) signals in specific symbols within a slot in the unlicensed band, including synchronization signal blocks, with the PDCCH related to the second SS/PBCH block, and system information transmitted through PDSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SS/PBCH blocks are transmitted in one slot in unlicensed band, then synchronization signal coverage and system information delivery are improved, but channel access complexity and transmission coordination difficulty increase
Solution Approach 1:
The patent segments the slot into distinct symbol groups: first symbols for first SS/PBCH block, second symbols for second SS/PBCH block, and at least one intermediate symbol for PDCCH signal. This segmentation allows independent channel access procedures for each signal type while maintaining overall coordination, thereby improving reliability without excessive complexity increase.
Solution Approach 2:
The PDCCH signal carrying scheduling information for the second SS/PBCH block is transmitted in advance in the intermediate symbol before the second SS/PBCH block symbols. This preliminary action allows the terminal to prepare for receiving system information in the PDSCH, improving delivery reliability while simplifying the overall transmission coordination.
2Loss of information
If PDCCH signal is transmitted between SS/PBCH block symbol groups, then downlink control information delivery is improved, but symbol resource allocation complexity increases
Solution Approach 1:
The patent assigns specific local qualities to different symbol positions: first symbols are dedicated to first SS/PBCH block transmission, intermediate symbols contain PDCCH signals with control information, and second symbols contain second SS/PBCH block. This local differentiation optimizes each symbol's function while maintaining overall system simplicity through clear resource partitioning.
3Productivity
If system information is transmitted via PDSCH scheduled by PDCCH, then information flexibility and efficiency are improved, but terminal processing complexity increases
Solution Approach 1:
The PDCCH signal acts as an intermediary between the control plane and data plane. It carries scheduling information that mediates the transmission of system information in PDSCH, allowing flexible and efficient information delivery while keeping terminal processing manageable through standardized scheduling procedures.
Data Source
AI summary
The present invention provides a method for transmitting and receiving a downlink signal between a terminal and a base station in a wireless communication system supporting an unlicensed band, and a device supporting the method. As a specific example, the present invention includes a method for: transmitting and receiving a physical downlink control channel (PDCCH) signal in an unlicensed band so that a base station and a terminal transmit and receive system information associated with a particular synchronization signal/physical broadcast channel (SS/PBCH) block; and, based on the PDCCH signal, transmitting and receiving a PDSCH signal including the system information.