Preconfigured Uplink Resource Control Signaling for 5G IoT
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Solution Overview
Problem
In 5G wireless systems, there is a need for efficient management of preconfigured uplink resources (PUR) to support low-power, low-data-rate communications for IoT devices, particularly in idle mode, where devices require dedicated or shared resources for small data transmissions, and need to monitor control channel search spaces for HARQ acknowledgments and resource management messages without excessive energy consumption.
Innovation Solution
The method involves allocating preconfigured uplink resources and radio network temporary identifiers to user equipment, assigning control channel search spaces, and instructing them to monitor these spaces according to a specified occasion cycle, using specific receive patterns to manage dedicated preconfigured uplink resources (D-PUR) and shared preconfigured uplink resources (S-PUR), including mechanisms for resource release and reconfiguration, and using wake-up signals to preempt resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment continuously monitors control channel search spaces for HARQ acknowledgments and resource management messages, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring of control channel search spaces at specified occasion cycles rather than continuous monitoring. The network configures the UE to monitor PUR-CCS at specific intervals (e.g., every N PUR occasions), allowing the device to enter low-power states between monitoring occasions while still maintaining communication reliability through periodic checks for HARQ acknowledgments and resource management messages.
2Productivity
If preconfigured uplink resources are allocated for idle mode devices, then data transmission efficiency is improved, but resource management complexity increases
Solution Approach 1:
The patent segments control message monitoring into dedicated PUR-CCS search spaces separate from other control channels. By creating a dedicated control channel for PUR resources with specific search space configurations, the system simplifies resource management for idle mode devices while maintaining efficient data transmission. The segmentation allows independent configuration and management of PUR-related control messages without affecting other uplink resources.
3Reliability
If control channel search space monitoring is configured for every PUR occasion, then resource management responsiveness is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial monitoring by configuring the UE to monitor PUR-CCS at a subset of PUR occasions rather than every occasion. The network can specify monitoring intervals (e.g., every N occasions) allowing the device to detect resource management messages at sufficient intervals to maintain responsiveness while significantly reducing the quantity of control channel messages that need to be transmitted and processed.
Data Source
AI summary
Method, apparatuses, and computer program product for overhead reduction are provided. One method may include receiving an allocation of a preconfigured uplink resource and a preconfigured uplink resource radio network temporary identifier associated with the preconfigured uplink resource. The method may also include receiving an assignment of a control channel search space associated with the preconfigured uplink resource. The method may further include monitoring, according to a specified occasion cycle, the control channel search space for a message. In addition, the message may be received according to a specific receive pattern.