NB-IoT Uplink Resource Unit Configuration for PUSCH and DM-RS
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Solution Overview
Problem
Current wireless communication systems, particularly in NB-IoT, face challenges in efficiently managing uplink transmission due to the need for reduced cost and battery consumption in low-data-rate scenarios, requiring innovative methods for configuring resource units and demodulation reference signals to enhance transmission efficiency.
Innovation Solution
A method and apparatus for NB-IoT user equipment (UE) that configures resource units with at least one tone for uplink transmission, transmitting a physical uplink shared channel (PUSCH) and demodulation reference signals (DM-RS) to efficiently manage uplink data transmission, optimizing resource allocation and signal demodulation in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the operating frequency bandwidth of the MTC UE is decreased to reduce cost and battery consumption, then the RF/baseband complexity is significantly reduced, but the data transmission rate is limited
Solution Approach 1:
The patent segments the uplink transmission into two distinct parts: a physical uplink shared channel (PUSCH) for data transmission and a physical demodulation reference signal channel (PD-RS) for channel estimation. This segmentation allows the narrowband UE to transmit data efficiently while using dedicated reference signals for accurate channel estimation, resolving the contradiction between limited bandwidth and transmission rate requirements
Solution Approach 2:
The patent introduces a demodulation reference signal as an intermediary element that enables the network to accurately estimate the channel characteristics. This reference signal acts as a mediator between the narrowband UE's limited bandwidth constraint and the network's requirement for reliable data demodulation, allowing efficient transmission despite the reduced operating frequency bandwidth
2Adaptability or versatility
If conventional LTE uplink transmission scheme is used in NB-IoT, then compatibility is maintained, but transmission efficiency is reduced due to NB-IoT specific requirements
Solution Approach 1:
The patent segments the uplink transmission into a physical uplink shared channel (PUSCH) for data and a physical demodulation reference signal channel (PD-RS) for channel estimation. This segmentation enables NB-IoT specific optimizations while maintaining LTE compatibility, as the segmented structure can coexist with existing LTE frameworks while improving transmission efficiency for narrowband UEs
Solution Approach 2:
The patent applies local quality by introducing NB-IoT specific characteristics into the uplink transmission structure. The PD-RS channel is specifically designed for narrowband UEs with different characteristics compared to conventional LTE, allowing optimized transmission efficiency for NB-IoT while maintaining overall system compatibility through the shared channel structure
Data Source
AI summary
A method and apparatus for transmitting a physical uplink shared channel (PUSCH) and a demodulation reference signal (DM-RS) in a wireless communication system is provided. A narrowband internet-of-things (NB-IoT) user equipment (UE) configures a set of resource units with at least one tone for uplink transmission in NB-IoT, transmits the PUSCH by using the set of resource units, and transmits the DM-RS used for demodulating the PUSCH by a network in the set of resource units.