PDCCH Cross-Slot Scheduling for 5G Energy Saving
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Solution Overview
Problem
In 5G and LTE communication systems, the introduction of cross-slot scheduling for energy-saving mechanisms can lead to communication problems due to inconsistencies between terminals and networks regarding scheduling methods, resulting in missed detection probabilities, switch time delays, and complex DRX configuration limitations.
Innovation Solution
The method involves using the PDCCH to transmit indication information for cross-slot scheduling states, allowing terminals to enter specific communication states in subsequent time slots, with fault-tolerant mechanisms to handle mismatches and dynamic signaling for adaptive energy-saving, reducing the time required to enter energy-saving states from tens of microseconds to microseconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If cross-slot scheduling is introduced for energy-saving, then power consumption of terminals is reduced, but communication problems occur due to inconsistencies between terminal and network understanding of scheduling method
Solution Approach 1:
The network device sends indication information through PDCCH to inform the terminal about the scheduling method to be used in subsequent time slots. This feedback mechanism ensures both terminal and network have consistent understanding of the scheduling approach, preventing communication errors while maintaining energy-saving benefits
Solution Approach 2:
The scheduling indication is provided in advance through PDCCH before the actual data transmission occurs in the second time slot. This preliminary notification allows the terminal to prepare appropriately for the scheduled transmission, ensuring reliable communication while maintaining the energy-saving cross-slot scheduling approach
2Use of energy by moving object
If cross-slot scheduling is used, then energy-saving is achieved, but switch time delays occur when terminal needs to switch between different communication states
Solution Approach 1:
The system dynamically switches between different scheduling modes (cross-slot and non-cross-slot) based on real-time communication needs. The PDCCH carries dynamic indication information that allows flexible transition between states, reducing fixed switch-time penalties while maintaining energy-saving benefits during appropriate periods
3Reliability
If DRX configuration is made complex to handle scheduling inconsistencies, then communication reliability improves, but device complexity increases
Solution Approach 1:
The PDCCH serves as an intermediary communication channel between the network device and terminal. It carries indication information that mediates the scheduling agreement, ensuring both parties operate with consistent understanding without requiring complex DRX configuration mechanisms
Data Source
AI summary
Methods for controlling communication states, a terminal, and a network device are provided. The method includes the following. The terminal receives a physical downlink control channel (PDCCH) from a network device in a first time slot, where the PDCCH carries first indication information indicative of a first communication state. The terminal enters the first communication state in a second time slot according to the first indication information, where the second time slot is after the first time slot.