NB Wireless Device SR Transmission Decision via HARQ ACK/NACK
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Solution Overview
Problem
Current 5G mobile communication systems lack a scheduling request (SR) procedure for Narrowband Internet of Things (NB-IoT) devices, which hinders efficient uplink resource allocation and data transmission.
Innovation Solution
A method for determining whether to transmit an SR using a hybrid automatic retransmit request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) signal, specifically utilizing a narrowband physical uplink shared channel (NPUSCH) and modulating the SR based on new data indicators and redundancy versions, with the option to include an SR bit in the NPUSCH and apply a codeword cover for orthogonal frequency division multiplexing (OFDM) symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If NB-IoT devices operate in reduced bandwidth, then device complexity and power consumption are reduced, but uplink resource allocation efficiency deteriorates due to lack of SR procedure
Solution Approach 1:
The patent combines the SR transmission function with the existing NPUSCH HARQ ACK/NACK transmission function. By merging these two functions, the patent enables SR transmission without requiring separate dedicated SR resources, thus maintaining the simplicity of NB-IoT devices while improving uplink resource allocation efficiency.
Solution Approach 2:
The NPUSCH channel is designed to serve multiple functions: it can transmit both HARQ ACK/NACK signals and SR signals. This multi-functionality allows the system to achieve efficient uplink resource allocation while avoiding additional device complexity, as the same channel infrastructure handles both purposes.
2Productivity
If SR transmission uses NPUSCH resources for HARQ ACK/NACK, then uplink resource allocation efficiency is improved, but signal transmission reliability may deteriorate due to resource sharing
Solution Approach 1:
The patent introduces dynamic resource allocation mechanisms where the eNB can flexibly assign NPUSCH resources based on whether SR or HARQ ACK/NACK transmission is needed. The system dynamically switches between SR transmission mode and HARQ transmission mode, ensuring reliable signal delivery while maintaining efficient resource utilization.
Solution Approach 2:
The patent implements feedback mechanisms where the eNB monitors NPUSCH transmissions and can request retransmission if SR or HARQ ACK/NACK signals are not successfully received. This feedback loop ensures transmission reliability while allowing efficient use of uplink resources through targeted retransmission only when necessary.
Data Source
AI summary
One disclosure of the present application provides a method for a narrowband (NB) wireless device to determine whether or not to transmit a scheduling request (SR). The method may comprise a step of determining whether or not to transmit an SR by using a resource for the transmission of a hybrid automatic retransmit request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) signal. The step of determination may be performed if one or more HARQ processes are run. The resource for the HARQ ACK/NACK signal may include a narrowband physical uplink shared channel (NPUSCH).