DCI Format for Emergency Notification in MTC Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving emergency information in Machine Type Communication (MTC) environments, particularly in Coverage Enhancement (CE) mode, where the system resources are limited and latency is critical.
Innovation Solution
The method involves using a specific Downlink Control Information (DCI) format, excluding information added by Radio Resource Control (RRC) configuration, to notify emergency information. This DCI format is designed to be compatible with the scheduling of Physical Downlink Control Channel (PDCCH) associated with MTC, reducing the scheduling burden on the Base Station (BS) and improving downlink transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DCI format includes RRC configuration information for scheduling PDCCH associated with MTC, then the scheduling capability is improved, but the DCI size and processing complexity increase
Solution Approach 1:
The patent extracts RRC configuration information from the DCI format, separating it into a standalone configuration phase. The DCI format is designed to exclude RRC configuration information, containing only essential scheduling parameters for emergency information transmission. This extraction reduces DCI size while maintaining scheduling capability through pre-configured parameters.
Solution Approach 2:
The patent segments the control information into two parts: RRC configuration information (transmitted separately via RRC signaling) and DCI information (transmitted via PDCCH). This segmentation allows the DCI to be compact and efficient for emergency notifications, while RRC handles detailed scheduling configurations independently.
2Adaptability or versatility
If the system transmits emergency information using existing DCI formats, then compatibility is maintained, but transmission efficiency and latency are worsened
Solution Approach 1:
The patent applies local quality by creating a specialized DCI format optimized specifically for emergency information transmission. This format has tailored fields and structure suited for urgent notifications, rather than using generic DCI formats designed for general data transmission. The specialized format reduces processing time and improves transmission efficiency for emergency scenarios while maintaining overall system compatibility.
3Adaptability or versatility
If the BS schedules emergency information with full PDCCH configuration, then scheduling flexibility is improved, but the scheduling burden on BS increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring scheduling parameters through RRC signaling before emergency information transmission. The BS and UE establish scheduling agreements in advance, so when emergency information needs to be transmitted, the BS only needs to send compact DCI with minimal parameters. This preliminary configuration reduces the real-time scheduling burden on the BS while maintaining flexibility.
Data Source
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AI summary
Presented in the present specification are a method for transmitting/receiving emergency information in a wireless communication system supporting machine type communication, and a device therefor. Particularly, the method performed by a terminal can comprise the steps of: receiving, from a base station, a system information block (SIB) including scheduling information about emergency information; receiving, from the base station, configuration information about the search space; receiving, from the base station, downlink control information (DCI) for the notification of the emergency information in the search space; and receiving, from the base station, the emergency information on the basis of the DCI and the scheduling information.