TDD Subframe Configuration for NB-IoT Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing resource allocation and scheduling for Time-Division Duplexing (TDD) arrangements, particularly in scenarios where paired spectrum blocks are not available.
Innovation Solution
The implementation of a method that allows for the selection of subframe configurations in wireless networks, specifically for TDD operation, by indicating the number of narrowband Internet-of-Things (NB-IoT) downlink subframes and downlink scheduling delays through control channels, enabling efficient resource allocation and scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDD arrangement is used with unpaired spectrum, then spectrum utilization is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the radio frame into specific subframe types (downlink subframes, uplink subframes, and special subframes) with defined functions. By dividing the frame structure and assigning specific roles to each subframe, the system enables TDD operation on unpaired spectrum while managing resource allocation complexity through structured segmentation rather than ad-hoc allocation.
2Adaptability or versatility
If multiple subframe configurations are supported, then system adaptability is improved, but scheduling difficulty increases
Solution Approach 1:
The patent enables dynamic subframe configuration where the network can select from multiple predefined TDD uplink-downlink configurations (Configuration 0-6) based on traffic requirements. The system dynamically adapts the subframe structure by selecting appropriate configurations and applying them to radio frames, allowing flexible adaptation to different scenarios while maintaining manageable scheduling through standardized configuration sets.
Solution Approach 2:
The patent changes the parameter of subframe configuration to support multiple TDD configurations. By defining different configurations with varying numbers and positions of downlink, uplink, and special subframes, the system can adapt to different traffic patterns and service requirements while keeping the scheduling mechanism systematic rather than arbitrary.
3Productivity
If NB-IoT downlink subframes are indicated through control channels, then resource allocation efficiency is improved, but control channel overhead increases
Solution Approach 1:
The patent uses existing control channels (PDCCH, EPDCCH) and DCI formats for multiple purposes: carrying both legacy scheduling information and new indicators for NB-IoT downlink subframes, repetition patterns, and scheduling delay information. By making these control structures multi-functional, the system achieves improved resource allocation efficiency without adding separate dedicated control channels, thus limiting the increase in overhead.
Data Source
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AI summary
Embodiments of a User Equipment (UE), generation Node-B (gNB) and methods of communication are generally described herein. The UE may receive, from a gNB, a narrowband physical downlink control channel (NPDCCH) that indicates a number of narrowband internet-of-things (NB-IoT) downlink subframes for a downlink scheduling delay of a narrowband physical downlink shared channel (NPDSCH) in one or more radio frames configured for time-division duplexing (TDD) operation. Subframes of the one or more radio frames may include uplink subframes, NB-IoT downlink subframes for downlink NB-IoT transmissions, and downlink subframes for other downlink transmissions. The UE may determine the downlink scheduling delay based on an earliest subframe for which a count of NB-IoT downlink subframes is equal to the number of NB-IoT downlink subframes indicated in the NPDCCH.