Preemption Indication for 5G Resource Management
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Solution Overview
Problem
The current 5G mobile communications system faces challenges in efficiently supporting both enhanced mobile broadband (eMBB) and ultra-reliable low latency communications (URLLC) services due to differences in data transmission requirements, particularly in managing resource preemption and interference, which affects data transmission efficiency and decoding success rates.
Innovation Solution
A control information transmission method is introduced where a network device sends preemption indication information through a physical downlink control channel to terminal devices, indicating affected time-frequency resources, allowing them to discard affected data and improve decoding success rates and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device allocates time-frequency resources to eMBB service data, then the data transmission amount and transmission rate are improved, but the resources may be preempted by URLLC service data causing decoding failures
Solution Approach 1:
The network device performs preliminary action by sending preemption indication information to the terminal device before the terminal device attempts to decode the downlink data. This preemption indication information indicates whether the allocated time-frequency resources have been preempted by URLLC service data, allowing the terminal device to avoid unnecessary decoding operations and improve decoding success rate while maintaining efficient resource utilization
2Loss of time
If the network device uses preemption to allocate resources to URLLC service data, then the latency requirement is met, but the eMBB service data transmission is interrupted
Solution Approach 1:
The network device implements feedback by sending preemption indication information to the terminal device when URLLC service data preempts eMBB service data resources. This feedback mechanism allows the terminal device to be aware of the preemption and adjust its decoding operations accordingly, enabling the system to meet URLLC latency requirements while minimizing the impact on eMBB service data transmission efficiency through informed resource management
3Reliability
If the terminal device monitors all allocated resources for preemption, then the decoding success rate is improved, but the energy consumption increases
Solution Approach 1:
The terminal device performs preliminary action by receiving preemption indication information from the network device before attempting to decode downlink data. This allows the terminal device to avoid energy-consuming decoding operations on resources that have been preempted, thereby reducing overall energy consumption while maintaining high decoding success rate through informed resource selection
Data Source
AI summary
This application provides a control information transmission method and a device, and relates to the wireless communications field, to improve data transmission efficiency. The method includes: determining, by a network device, first indication information, where the first indication information is used to indicate whether information transmission on a first time-frequency resource is affected; sending, by the network device, the first indication information through a physical downlink control channel; and receiving, by a terminal device, the first indication information, and determining, based on the first indication information, whether information transmission on a third time-frequency resource is affected, where the third time-frequency resource is a time-frequency resource that is used for downlink information transmission between the terminal device and the network device.