Downlink Control Signal Detection Latency Reduction
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Solution Overview
Problem
In 5G communication systems, there is a need to reduce signal transmission/reception latency between communication nodes, particularly in scenarios where different services like eMBB, URLLC, and mMTC share frequency bands, leading to potential conflicts and inefficiencies in data transmission.
Innovation Solution
A method is introduced where a terminal and base station operate in a latency reduction mode, optimizing the timing of downlink control signal detection and transmission by omitting the acquisition of second downlink control information if it is already acquired based on a first scheme, allowing for efficient resource use and conflict-free data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal acquires both first and second downlink control information using both schemes, then the reliability of control signal reception is improved, but the latency increases and resource efficiency deteriorates
Solution Approach 1:
The patent applies partial action by having the terminal selectively acquire only the necessary downlink control information based on the detected transmission mode. When the first scheme is detected, the terminal acquires only the first downlink control information, avoiding unnecessary acquisition of the second scheme's control information, thereby reducing latency while maintaining sufficient reliability for the current transmission mode.
Solution Approach 2:
The patent implements dynamics by making the control information acquisition process adaptive to the detected transmission mode. The terminal dynamically adjusts its acquisition behavior based on real-time detection of which scheme is being used, transitioning between different acquisition strategies to optimize both reliability and latency according to current system conditions.
2Adaptability or versatility
If the terminal monitors both first and second search spaces for downlink control signals, then the adaptability to different transmission modes is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent applies partial action by having the terminal monitor only the necessary search space based on the detected transmission mode. When the first scheme is detected, the terminal monitors only the first search space, reducing processing complexity while maintaining adaptability to the active transmission mode through selective monitoring.
Solution Approach 2:
The patent extracts the essential monitoring function by separating the monitoring of different search spaces into distinct, conditionally executed tasks. The terminal extracts and executes only the relevant monitoring task based on the detected scheme, removing unnecessary monitoring overhead while preserving adaptability to different transmission modes.
3Productivity
If the terminal attempts to acquire downlink control information in both schemes simultaneously, then the productivity of control information acquisition is improved, but the loss of time due to processing conflicts increases
Solution Approach 1:
The patent applies preliminary action by having the terminal detect the transmission mode and determine the active scheme before attempting to acquire control information. This preliminary detection prevents processing conflicts by establishing which acquisition path to follow in advance, maintaining acquisition efficiency while eliminating time loss from simultaneous conflicting operations.
Solution Approach 2:
The patent inverts the conventional approach by detecting the transmission mode first and then selectively acquiring control information based on that detection, rather than attempting simultaneous acquisition and then resolving conflicts. This inversion of the operation sequence eliminates processing conflicts while maintaining acquisition productivity.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method by a terminal in a mobile communication system is provided. The method includes receiving configuration information corresponding to a transmission mode; receiving first downlink control information on a first subframe; omitting acquisition of second downlink control information using a second scheme, if the first downlink control information is acquired based on the first scheme; and transmitting information corresponding to the first downlink control information on a subframe corresponding to the first downlink control information.