Narrowband Wireless Data Transmission with Preconfigured Uplink Resources
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Solution Overview
Problem
Current narrowband wireless communication systems face challenges in efficiently transmitting and receiving data, particularly in minimizing battery consumption for user equipment (UE) when receiving ACK/NACK signals in idle mode.
Innovation Solution
A method is introduced where a base station transmits preconfigured uplink resources to user equipment (UE) and configures feedback to be sent on a specific NPDCCH after a certain time, allowing for efficient monitoring and response to uplink data, including indicating when to stop monitoring for feedback and handling PUR retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors for ACK/NACK feedback in idle mode, then the reliability of data reception is improved, but the battery consumption increases
Solution Approach 1:
The UE monitors for ACK/NACK feedback only at specific periodic intervals rather than continuously. The base station transmits ACK/NACK feedback at predetermined time points after receiving uplink data, and the UE wakes up only at these specific moments to check for feedback, then returns to idle mode. This periodic monitoring approach ensures reliable data reception while significantly reducing battery consumption compared to continuous monitoring.
2Speed
If the feedback transmission delay is reduced, then the responsiveness of the system is improved, but the UE must wake up more frequently increasing energy consumption
Solution Approach 1:
The system optimizes the time interval between uplink data transmission and ACK/NACK feedback transmission by configuring specific parameter values. The base station transmits feedback at predetermined time points (e.g., 4 subframes after PUR reception) rather than immediately, allowing the UE to sleep longer between wake-ups while still maintaining acceptable feedback speed for IoT applications.
3Reliability
If the UE monitors the entire feedback window, then no feedback is missed improving reliability, but the monitoring complexity and energy consumption increase
Solution Approach 1:
Instead of monitoring the entire feedback window, the UE extracts and monitors only the specific time point where the ACK/NACK feedback is expected to be transmitted. The base station configures the exact subframe where feedback will be sent, allowing the UE to wake up only at that specific moment rather than scanning the entire window, thereby reducing monitoring complexity and energy consumption while maintaining reliable feedback reception.
Data Source
AI summary
Disclosed is a method for transmitting and receiving data between a user equipment (UE) and a base station in a narrowband wireless communication system. Specifically, the method includes transmitting, to the UE, a preconfigured uplink (UL) resource (PUR) configuration via RRC signalling, receiving, from the UE, uplink data on the PUR when the UE is in an idle mode, and transmitting, to the UE, a feedback for the uplink data, wherein the feedback is configured to be transmitted on an NPDCCH after a specific time has passed from the PUR reception.