Vehicle Multi-Link Frame Scheduling for Interference Blocking
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Solution Overview
Problem
Existing drone communication systems face challenges with inter-link interference and blocking in multi-link communication schemes, particularly when using both directional and omni-directional communication links, which affect transmission efficiency and reliability.
Innovation Solution
A method and apparatus for multi-link communications that utilize directional and omni-directional communication links, where the communication schemes are determined based on the transmittable interfaces of stations, allowing for simultaneous transmissions without interference by scheduling transmission times and using a hybrid RF/OWC transmitter with MIMO structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-link communication scheme is used to increase transmission efficiency, then data transmission speed is improved, but inter-link interference and blocking occur
Solution Approach 1:
The communication system segments transmission into different time slots for directional and omni-directional links, preventing simultaneous transmissions that cause interference. The access point transmits trigger frames in specific time slots and receives response frames in designated time periods, dividing the communication process to eliminate conflicts.
Solution Approach 2:
The access point performs preliminary actions by transmitting trigger frames before actual data transmission, including timing information and communication scheme details. This preliminary scheduling allows stations to prepare for simultaneous transmissions without interference by knowing in advance when each link will be active.
2Reliability
If directional communication links are used to minimize interference, then transmission reliability is improved, but transmission coverage is limited
Solution Approach 1:
The system merges directional and omni-directional communication links into a unified multi-link communication scheme. The access point can select between directional links (for reliability) and omni-directional links (for coverage) based on the specific communication requirements, combining the advantages of both approaches.
Solution Approach 2:
The communication system achieves universality by supporting multiple communication schemes (directional and omni-directional) within a single system framework. The access point and stations can flexibly switch between different communication schemes based on interference conditions, distance, and coverage requirements.
3Productivity
If simultaneous transmissions are performed to improve efficiency, then productivity is improved, but interference between transmissions increases
Solution Approach 1:
The access point acts as an intermediary that coordinates between multiple stations, managing the timing of simultaneous transmissions. By controlling when trigger frames are sent and when response frames are received, the access point enables simultaneous transmissions while preventing interference through centralized coordination.
Solution Approach 2:
The system uses feedback mechanisms where stations transmit response frames after receiving trigger frames. The access point receives these response frames in designated time periods, using the feedback information to determine whether simultaneous transmissions were successful and to adjust future transmission scheduling accordingly.
Data Source
AI summary
An operation method performed by an access point in a communication system may comprise: transmitting, to a first station, a first frame by using a third communication scheme, the first frame including information on an address of the first station, a first transmission time length, a first reception order, and a first communication scheme to be used for transmitting data to the first station, and information on a second transmission time length, a second reception order, and a second communication scheme to be used for transmitting second data to one or more second stations; receiving, from the first station, a first response frame for the first frame from the first station at a first reception time; and receiving, from the second station, a second response frame for the first frame at a second reception time.