LAA Downlink Control Information Blind Detection Across Carriers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LAA technologies experience delays in transmitting downlink control information over un-licensed frequency spectra, particularly for uplink HARQ, leading to inefficiencies and poor user experience due to reliance on pre-configured scheduling and sensing mechanisms.
Innovation Solution
The method involves transmitting cell group information to terminals, instructing them to perform blind detection across multiple carriers, including un-licensed and licensed carriers, to rapidly obtain downlink control information, reducing time delays by utilizing the opportunity transmission property of LBT in LAA systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-configured scheduling and sensing mechanisms are used in LAA, then network control and reliability are maintained, but transmission delays increase significantly for downlink control information
Solution Approach 1:
The terminal performs blind detection on multiple carriers simultaneously without waiting for network scheduling instructions. The network pre-configures multiple candidate carriers, and the terminal proactively monitors these carriers for downlink control information, eliminating the sequential sensing-and-transmit delay while maintaining reliable delivery through predefined carrier options.
2Adaptability or versatility
If conventional CA scheduling is applied to un-licensed frequency spectrum, then scheduling flexibility is maintained, but communication efficiency deteriorates due to repeated sensing and transmitting
Solution Approach 1:
The downlink control information transmission is segmented across multiple carriers. Instead of concentrating all control signaling on a single scheduled carrier, the system divides the control information transmission opportunity across multiple pre-configured carriers, allowing the terminal to receive control information from any available carrier and eliminating the need for repeated sensing cycles.
3Adaptability or versatility
If uplink HARQ feedback is transmitted through pre-configured carriers, then protocol compatibility is maintained, but feedback delay increases causing low efficiency
Solution Approach 1:
The system dynamically selects which carrier to use for HARQ feedback transmission from a set of pre-configured carriers. Instead of being fixed to a single carrier, the feedback mechanism adapts to carrier availability in real-time, allowing the terminal to send HARQ feedback on the first available carrier from the configured set, thereby reducing delay while maintaining protocol compatibility.
Data Source
AI summary
A method and a device for communication based on LAA, the method for communication includes: transmitting cell group information to a terminal, where the cell group information points to multiple carriers, and the multiple carriers comprise an un-licensed carrier and a licensed carrier; and transmitting downlink control information through an activated carrier in the multiple carriers, where the cell group information is used to instruct the terminal to implement a blind detection to the multiple carriers so as to obtain the downlink control information. Technical solutions of the present disclosures can improve communication speed and efficiency of a LAA system.