Wireless Control Channel Scheduling Adaptation
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently supporting both slot-based and non-slot-based scheduling techniques, particularly in configuring and indicating scheduling schemes to terminals, which affects the transmission and reception of downlink control and data channels.
Innovation Solution
A method where a base station configures or indicates a slot-based or non-slot-based scheduling scheme to a terminal by transmitting a slot format indicator via group-common downlink control information, utilizing unknown symbols, and configuring certain time/frequency resources as reserved resources, allowing terminals to monitor a control resource set for downlink control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If slot-based scheduling is used, then transmission structure is simplified, but scheduling flexibility is reduced
Solution Approach 1:
The patent implements dynamic scheduling by allowing the base station to flexibly configure slot formats and indicate whether slot-based or non-slot-based scheduling is used through downlink control information. This enables the system to adapt between structured slot-based transmission and flexible non-slot-based transmission depending on traffic requirements, resolving the contradiction between transmission structure simplicity and scheduling flexibility.
2Adaptability or versatility
If non-slot-based scheduling is used, then scheduling flexibility is improved, but device complexity increases
Solution Approach 1:
The patent introduces downlink control information as an intermediary mechanism that carries scheduling indications from the base station to the terminal. This intermediary enables flexible non-slot-based scheduling by dynamically indicating resource allocation without requiring complex terminal-side scheduling decisions, thus achieving scheduling flexibility while managing device complexity through centralized control.
3Speed
If downlink control information is transmitted frequently, then scheduling responsiveness is improved, but signal overhead increases
Solution Approach 1:
The patent employs parameter changes in the downlink control information structure, dynamically adjusting the presence and content of scheduling fields based on whether slot-based or non-slot-based scheduling is configured. By conditionally including or excluding certain information elements, the system maintains fast scheduling responsiveness while reducing average control signal overhead through adaptive parameter configuration.
Data Source
AI summary
Method of terminal, terminal, method of base station, and base station in wireless communication system are provided. Method of a terminal in the wireless communication system includes receiving, from a base station via radio resource control (RRC) signaling, information for a rate matching resource, identifying resources that are unavailable for physical downlink shared channel (PDSCH) reception based on the rate matching resource, monitoring a physical downlink control channel (PDCCH) candidate except for at least one PDCCH candidate that overlaps with the identified resources, and receiving, from the base station, downlink control information (DCI) based on the monitoring of the PDCCH candidate.