Multi-frequency time division multiple access system and method based on directional antenna

A multi-frequency time division multiple access and directional antenna technology, which is applied in the field of aircraft network, can solve the problems such as reports closely related to the distributed aircraft network multiple access method based on directional antenna, and achieves the improvement of system throughput and breakthrough in transmission. The effect of capacity bottleneck and low business loss

Active Publication Date: 2021-06-01
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] At present, research on distributed aircraft networks is still in its infancy, and most of the access technologies focus on the configuration of omnidirectional antennas at nodes. Since the present invention involves satellites and other aircraft, there are very few relevant documents at present, and there is no relevant literature in a certain range. The multiple access method of distributed aircraft network based on directional antenna is closely related to the report, so it is imperative to design a multiple access technology suitable for the directional antenna scenario

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  • Multi-frequency time division multiple access system and method based on directional antenna
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  • Multi-frequency time division multiple access system and method based on directional antenna

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Embodiment 1

[0046] Now that the world has fully entered the information age, the importance of information acquisition is reflected in all aspects of economic and social activities. Among them, the ability to obtain aerial information shows the comprehensive strength of a country and its influence in the international community. Airborne information is mainly obtained through satellites and other aircraft, so the development of aircraft network technology determines whether the acquisition of aerial information can be rapid and effective. At present, the research and application of distributed aircraft networks are still in their infancy, and most of the access technologies focus on the configuration of omnidirectional antennas at nodes. Up to now, there is no multi-access method for distributed aircraft networks based on directional antennas. The present invention proposes A multiple access system and method applicable to a directional antenna scenario.

[0047] The present invention is...

Embodiment 2

[0050] The overall structure of the directional antenna-based MFTODMA access system is the same as that in Embodiment 1. In the present invention, the communication time slots of nodes in the same subnet are divided based on the number of links. specifically is figure 1 The intranet communication between subnet 1 and subnet 2 uses the part of time division multiple access (TDMA).

[0051] Due to the limitation of shadowing effect, communication distance, coverage time and other factors, the aircraft cannot always maintain communication with the ground station. At this time, nodes that cannot directly communicate with the ground station need to exchange information with surrounding nodes to perceive the network topology. Under the condition of directional antennas, when the nodes use unicast communication, if the time is not allocated reasonably or the neighbor nodes to be communicated are not known, conflicts will occur.

[0052] Therefore, in order to ensure that all members...

Embodiment 3

[0054] The present invention is also a directional antenna-based multi-frequency time-division multiple access method, implemented in the above-mentioned directional-antenna-based multi-frequency time-division multiple access system, and the overall composition of the directional-antenna-based multi-frequency time-division multiple access system With embodiment 1-2. see figure 2 , the multi-frequency time division multiple access method based on directional antenna includes the following steps:

[0055] Step 1, subnet division: divide different frequency bands for each subnet, the gateway node supports full-frequency reception, and nodes in the same subnet communicate with each other through time division multiple access.

[0056] Step 2, superframe composition: each superframe is divided into inter-network multiframe and intranet multiframe, inter-network multiframe is divided into inter-network service frame, inter-network fixed subframe and inter-network dynamic subframe,...

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Abstract

The invention discloses a multi-frequency time division multiple access system and method based on a directional antenna, belongs to the technical field of aircraft networks, and solves the technical problem of multi-access access of distributed aircraft networks under the condition of directional antennas. The subnet division of the system is driven by tasks, and the number of nodes in the subnet is variable; each subnet occupies different frequency bands for communication, and the gateway node supports full-frequency reception; nodes in the same subnet communicate in a time-division manner. The implementation process is: dividing subnets; dividing time slots based on the number of links, adopting a time slot allocation method combining fixed and dynamic allocation, performing topology maintenance in fixed time slots, reserving dynamic time slots to transmit services; giving priority to guaranteeing high priority business communication. The invention reduces interference, improves space multiplexing rate, makes full use of frequency spectrum resources to reduce time delay, maximizes network throughput in limited resources, meets transmission requirements of various services, and improves system communication efficiency. Access procedures applicable to distributed aircraft networks configured with directional antennas.

Description

technical field [0001] The invention belongs to the field of aircraft network technology, and mainly relates to a distributed aircraft network multiple access technology under a directional antenna, in particular to a multi-frequency time division multiple access system and method based on a directional antenna, which is used in a distributed aircraft network. Background technique [0002] There are two types of antennas used in distributed aircraft networks: omnidirectional and directional. The propagation characteristics of the former on a certain plane (generally a horizontal plane) are exactly the same, that is, the energy is evenly distributed in all directions; while the latter has beam directionality, and its effective coverage is a fan-shaped area, and the fan-shaped angle is is the beamwidth of the directional antenna. [0003] Directional antennas allow a sending node to transmit data packets in a specific direction while adjacent receiving nodes receive data pack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04W72/06H04W72/08H04J11/00
CPCH04J11/0023H04W72/0446H04W72/563H04W72/543
Inventor 张琰梁荟萃苏郁盛敏李建东刘润滋孙红光刘俊宇
Owner XIDIAN UNIV
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