NB-IoT DCI Field Segmentation for Coding Parameter Determination
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Solution Overview
Problem
The LTE/LTE-A and NB-IOT systems have distinct differences in bandwidth, multi-access modes, and coding modes, leading to a lack of methods for determining coding modulation parameters in the NB-IOT system, which hinders correct coding and decoding, and this issue is also present in the 5G New Radio Access (NR) system.
Innovation Solution
A method for determining coding modulation parameters in the NB-IOT system involves the User Equipment (UE) receiving Downlink Control Information (DCI) from the base station and using specific fields within the DCI to determine parameters such as Transmission Block Size (TBS), Modulation and Coding Scheme (MCS), and Redundancy Version (RV), allowing for resource allocation and joint coding based on predefined transmission information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE uses LTE/LTE-A coding modulation parameter determination methods, then the system compatibility is maintained, but the NB-IOT system cannot correctly determine coding modulation parameters due to fundamental differences in bandwidth, multi-access modes, and coding modes
Solution Approach 1:
The patent changes the determination parameters from LTE-based methods to NB-IOT-specific parameters including bandwidth parameters (180 kHz transmitting bandwidth), subcarrier interval (15 kHz), and resource block structure. This allows the UE to correctly determine coding modulation parameters adapted to NB-IOT's fundamental differences in bandwidth, multi-access modes, and coding modes while maintaining system operation.
Solution Approach 2:
The patent segments the Downlink Control Information (DCI) into specific fields for NB-IOT parameter determination, including resource allocation fields, modulation and coding scheme fields, and redundancy version fields. This segmentation allows independent optimization of each parameter determination process for NB-IOT requirements while maintaining overall system compatibility.
2Adaptability or versatility
If the system uses separate fields for resource allocation and coding modulation parameters, then the parameter determination flexibility is improved, but the signaling overhead increases
Solution Approach 1:
The patent merges resource allocation information and coding modulation parameter information into unified DCI fields. Specifically, the resource allocation field simultaneously indicates resource block allocation and implies coding parameters, while the modulation and coding scheme field combines modulation order and coding rate information. This merging reduces signaling overhead while maintaining the flexibility needed for NB-IOT's specific requirements.
3Use of energy by moving object
If the NB-IOT system uses FDMA with GMSK modulation, then the power amplification efficiency is improved and coverage is ensured, but the spectrum efficiency decreases
Solution Approach 1:
The patent implements dynamic selection between FDMA with GMSK modulation and SC-FDMA based on traffic conditions and channel state. The base station can dynamically switch multiplexing access technologies and modulation schemes, allowing the system to exploit FDMA's power efficiency advantages when needed while transitioning to SC-FDMA for high spectrum efficiency requirements, thus resolving the contradiction between power amplification efficiency and spectrum efficiency.
Data Source
AI summary
Disclosed are a method, device and system for determining a coding modulation parameter. The method includes: a terminal receives downlink control information from a base station, and determines a coding modulation parameter according to a domain, within the downlink control information, used for determining the coding modulation parameter.