NB-IoT TDD Configuration via LTE System Information
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Solution Overview
Problem
Current communication systems face challenges in dynamically switching uplink and downlink configurations in Narrowband Internet of Things (NB-IoT) time division duplex (TDD) operations, especially when integrated with LTE TDD networks, due to limitations in resource allocation and interference mitigation, which affects the capacity and efficiency of NB-IoT systems.
Innovation Solution
The method involves defining multiple physical resource blocks, with an anchor block in a guard band, to transmit a channel/signal containing uplink and downlink configuration information using a Zadoff-Chu sequence, allowing dynamic switching of configurations without impacting LTE TDD functionality, and enabling NB-IoT to operate efficiently by adapting resource usage based on signal strength thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic switching of uplink and downlink configurations is implemented in NB-IoT TDD operations, then the adaptability and capacity of the system is improved, but the complexity of configuration management and interference mitigation increases
Solution Approach 1:
The patent introduces an intermediary mechanism using LTE TDD system information as a mediator to convey NB-IoT uplink-downlink configuration information. Instead of direct complex configuration management between NB-IoT nodes, the LTE system information acts as a carrier that simplifies the information exchange process, enabling dynamic switching without proportionally increasing system complexity
Solution Approach 2:
The patent applies universality by reusing existing LTE TDD system information channels for dual purposes: their original function for LTE operations and the additional function of carrying NB-IoT configuration information. This multi-functionality approach enables dynamic configuration switching in NB-IoT while leveraging the existing LTE infrastructure, avoiding the need for separate dedicated signaling mechanisms
2Productivity
If frequent updates of UL/DL configurations are enabled, then the productivity and resource utilization are improved, but the reliability of configuration transmission and interference mitigation deteriorates
Solution Approach 1:
The patent implements periodic action by utilizing the periodic broadcasting of LTE system information to deliver NB-IoT configuration updates. Rather than attempting continuous or ad-hoc configuration transmission, the system leverages the established periodic transmission cycles of LTE system information, which provides reliable periodic delivery while enabling frequent configuration updates aligned with network conditions
Solution Approach 2:
The patent applies beforehand cushioning by designing the configuration transmission mechanism to anticipate and prepare for potential interference and transmission failures. By embedding the configuration information in the robust LTE system information framework and using periodic broadcasting, the system pre-establishes reliable transmission channels that can cushion against interference and ensure configuration updates are delivered even in challenging radio environments
3Adaptability or versatility
If NB-IoT operates in guard band mode with LTE TDD, then the compatibility and coexistence are improved, but the available resource blocks and system capacity are reduced
Solution Approach 1:
The patent applies segmentation by dividing the frequency spectrum into distinct regions - guard band resource blocks for NB-IoT operations and in-band resource blocks for additional NB-IoT capacity. This segmentation allows NB-IoT to operate compatibly with LTE TDD in the guard band while preserving the ability to utilize in-band resources when available, thus maintaining network compatibility without being constrained to reduced capacity alone
Solution Approach 2:
The patent implements dynamics by enabling the system to adaptively select between guard band and in-band resource blocks based on real-time network conditions and configuration updates. Rather than being fixed to a single resource allocation mode, the system dynamically adjusts its operation to maximize available resources while maintaining compatibility with LTE TDD, thereby optimizing capacity utilization across different deployment scenarios
Data Source
AI summary
A method for configuring an access node to operate within a time division duplex communications system between the access node and at least one user equipment wherein the time division duplex communications system is a narrowband internet of things time division duplex communications system co-located with a long term evolution communications system network configured to switch a uplink and downlink configuration from frame to frame, the method comprising: generating a channel/signal, the channel/signal comprising information of a uplink and downlink configuration for communication between the access node and the at least one user equipment; mapping the channel/signal to at least one subframe period; and transmitting the channel/signal to the at least one user equipment during the at least one subframe period, such that the channel/signal is received and used by the at least one user equipment to set a uplink and downlink configuration for communication between the access node and the at least one user equipment.