PDCCH Resource Mapping for IoT Coverage Enhancement
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Solution Overview
Problem
In IoT UE devices like MTC and NB-IOT, the requirement for longer battery life and lower cost necessitates smaller operating bandwidths and fewer transceiver antennas, leading to worse coverage compared to ordinary UEs. Additionally, in NR systems, the power-limited uplink cannot achieve coverage enhancement even with more PRBs allocated, and the current time domain resource scheduling limits transmission across multiple slots.
Innovation Solution
The method involves enhancing the physical downlink control channel (PDCCH) by receiving configuration information, determining resource mapping from control channel elements (CCEs) to search space (SS) regions, and receiving the PDCCH based on this resource mapping. This approach allows for more efficient resource allocation and improved coverage by optimizing the time and frequency domain resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If smaller operating bandwidth and fewer transceiver antennas are used in IoT UE devices, then battery life is extended and cost is reduced, but coverage performance deteriorates
Solution Approach 1:
The patent combines multiple PDCCH monitoring opportunities across different slots and search space sets into a unified monitoring framework. By merging monitoring resources and aggregating control channel elements from multiple opportunities, the system compensates for the reduced reception capability of IoT UEs with simpler antenna configurations, thereby maintaining coverage performance while allowing these devices to use fewer antennas.
Solution Approach 2:
The patent introduces time-domain repetition and multi-slot monitoring as an additional dimension for PDCCH reception. Instead of relying solely on spatial diversity through multiple antennas, the system extends monitoring across multiple time slots and search space sets, creating temporal redundancy that compensates for the limited antenna resources in cost-sensitive IoT devices.
2Reliability
If more PRBs are allocated in NR uplink, then coverage enhancement is attempted, but the power-limited system cannot achieve improvement
Solution Approach 1:
The patent performs preliminary action by configuring multiple search space sets and monitoring opportunities in advance, allowing the UE to accumulate control channel information over multiple slots before transmission. This pre-positioning of monitoring resources enables the system to achieve coverage enhancement through temporal aggregation rather than requiring additional instantaneous power or frequency resources.
Solution Approach 2:
The patent establishes continuity of useful action by implementing persistent scheduling and repeated PDCCH monitoring across multiple slots. Instead of relying on single-shot high-power transmissions that are limited by uplink power constraints, the system maintains continuous monitoring and accumulation of control channel elements over an extended time period, effectively achieving coverage enhancement through sustained low-power operation.
3Device complexity
If current time domain resource scheduling is used, then resource allocation is simplified, but transmission across multiple slots is limited
Solution Approach 1:
The patent introduces dynamic scheduling across multiple slots by allowing search space sets to be configured with different periodicities, offsets, and monitoring opportunities. The system dynamically adapts the monitoring behavior and resource allocation based on traffic patterns and channel conditions, enabling flexible multi-slot transmission while maintaining manageable complexity through standardized configuration parameters and procedures.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method and device for receiving a physical downlink control channel in a wireless communication network, and method and device for determining resources.