PUR Configuration for NB-IoT Uplink Transmission in Idle State
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In NB-IoT systems, maintaining terminal complexity and reducing battery consumption is challenging, especially when semi-persistent scheduling (SPS) is operated, and there is a need for efficient uplink data transmission methods, particularly in idle states.
Innovation Solution
A method for a terminal to transmit uplink data using preconfigured uplink resources (PUR) by receiving configuration information in an RRC connected state, transitioning to an RRC idle state, and transmitting data based on this information, while determining the validity of timing advance (TA) using a TA validity timer, RSRP detection, and TDoA information, and performing a random access procedure when TA is not valid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling (SPS) is operated in NB-IoT system, then uplink data transmission capability is improved, but terminal complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink resources (PUR) in advance during RRC connected state before transitioning to idle state. The terminal receives configuration information including resource allocation, timing advance, and transmission parameters while still connected, so that when it transitions to idle state, it can immediately transmit uplink data without requiring complex real-time scheduling decisions, thereby reducing terminal complexity while maintaining transmission capability
Solution Approach 2:
The patent implements self-service by enabling the terminal to autonomously determine the validity of timing advance (TA) using pre-configured criteria such as TA validity timer, RSRP detection information, and TDoA information. The terminal independently assesses whether the pre-configured uplink resources remain valid without requiring continuous network interaction, reducing signaling overhead and terminal complexity while maintaining reliable uplink transmission
2Use of energy by moving object
If terminal transitions to RRC idle state to save battery, then energy consumption is reduced, but ability to transmit uplink data efficiently deteriorates
Solution Approach 1:
The patent applies preliminary action by having the terminal receive and store configuration information for uplink data transmission while in RRC connected state, before transitioning to idle state. This pre-configuration includes resource allocation, timing advance values, and transmission parameters, enabling the terminal to efficiently transmit uplink data in idle state without requiring frequent transitions to connected state, thus saving battery while maintaining transmission efficiency
Solution Approach 2:
The patent implements periodic action through the use of a TA validity timer that periodically checks whether the pre-configured timing advance remains valid. The terminal can maintain idle state for extended periods to conserve energy, only activating transmission when needed and using the periodic timer mechanism to ensure timing accuracy, thereby balancing energy savings with transmission efficiency
3Reliability
If terminal determines TA validity using multiple criteria (timer, RSRP, TDoA), then transmission reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple validity criteria (TA validity timer, RSRP threshold, TDoA threshold) during the RRC connected state. These criteria are established in advance based on network conditions and terminal capabilities, allowing the terminal to perform simple threshold comparisons rather than complex calculations during idle state, thus improving reliability while minimizing processing complexity
Solution Approach 2:
The patent implements self-service by enabling the terminal to autonomously evaluate multiple validity criteria using pre-configured thresholds and simple comparison operations. The terminal independently determines TA validity by checking whether the timer has expired, whether RSRP exceeds the threshold, and whether TDoA is within the threshold, making decisions without network intervention, thereby improving reliability through multi-criteria assessment while keeping processing complexity low through simple threshold-based evaluation
Data Source
AI summary
The present specification provides a method for transmitting uplink data by using a preset uplink resource (PUR) in a wireless communication system. More specifically, the method, which is performed by a terminal, includes: a step for receiving setting information from a base station in an RRC connected state, the setting information being for transmitting uplink data by using the PUR in an RRC idle state; a step for transitioning from the RRC connected state to the RRC idle state; and a step for using the PUR to transmit the uplink data to the base station in the RRC idle state on the basis of the setting information.