NB-IoT Downlink Resource Reservation for Low-Latency Reliability
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Solution Overview
Problem
The existing wireless communication systems face challenges in efficiently managing increased data traffic, high-speed services, and resource allocation for Internet of Things (IoT) devices, particularly in scenarios like MTC and NB-IoT, with limitations in resource reservation and compatibility with other communication systems.
Innovation Solution
A method and device for configuring and utilizing reserved resources in a wireless communication system supporting IoT, using downlink control information (DCI) to hierarchically manage resources in units of specific bandwidths, such as narrowband or NB-IoT carriers, and employing a slot and symbol level bitmap for resource reservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reserved resources are configured for IoT devices to ensure reliable communication, then communication reliability is improved, but resource allocation flexibility deteriorates
Solution Approach 1:
The patent implements dynamic resource reservation by introducing a reservation indication field in DCI that can switch between reserved and non-reserved resource modes. This allows the system to dynamically adjust resource allocation based on real-time communication needs, transforming static reserved resources into flexible dynamic resources that can adapt to varying reliability requirements and traffic conditions.
2Loss of information
If hierarchical resource configuration is implemented to improve signaling efficiency, then signaling overhead is reduced, but system complexity increases
Solution Approach 1:
The patent segments resource configuration into multiple hierarchical levels: cell-level reserved resource configuration, UE-specific reservation indication via DCI, and specific resource allocation. This segmentation allows different granularity levels to handle different aspects of resource management, reducing overall signaling overhead while distributing system complexity across multiple manageable components rather than concentrating it in a single complex mechanism.
3Productivity
If reserved resources are allocated in units of specific bandwidth (narrowband, NB-IoT carrier), then resource utilization efficiency is improved, but compatibility with other communication systems deteriorates
Solution Approach 1:
The patent applies local quality by configuring reserved resources at specific bandwidth levels (narrowband, NB-IoT carrier) only where needed for IoT devices, while maintaining standard resource allocation in other parts of the spectrum. This localized approach to resource reservation improves efficiency for IoT traffic without imposing the same constraints on other communication systems, thereby preserving system compatibility and multi-operator support.
4Loss of time
If dynamic resource reservation based on DCI is used to reduce latency, then communication speed is improved, but processing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring reserved resources at higher layers before actual data transmission. When data needs to be transmitted, the system only needs to activate these pre-prepared resources through a simple DCI indication rather than performing complex real-time resource allocation. This advance preparation significantly reduces latency while keeping the actual transmission-time processing complexity low.
Data Source
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AI summary
A method of transmitting and receiving downlink information in a wireless communication system supporting Internet of Things (IoT) and a device therefor are disclosed. The method performed by a user equipment (UE) comprises transmitting, to a base station, a physical random access channel (PRACH) preamble, receiving, from the base station, a random access response including an uplink (UL) grant based on the PRACH preamble, transmitting, to the base station, a message 3 based on the UL grant, and receiving, from the base station, a message for contention resolution based on the message 3.