CN107979872A - Multi-frequency time division multiple access access system and method based on directional aerial - Google Patents

Multi-frequency time division multiple access access system and method based on directional aerial Download PDF

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Publication number
CN107979872A
CN107979872A CN201711102111.3A CN201711102111A CN107979872A CN 107979872 A CN107979872 A CN 107979872A CN 201711102111 A CN201711102111 A CN 201711102111A CN 107979872 A CN107979872 A CN 107979872A
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node
net
time slot
subnet
slot
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CN107979872B (en
Inventor
张琰
梁荟萃
苏郁
盛敏
李建东
刘润滋
孙红光
刘俊宇
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Xidian University
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources

Abstract

The invention discloses a kind of multi-frequency time division multiple access access system and method based on directional aerial, belongs to aircraft networks technical field, solves the problems, such as Distributed Flight device network multiple access technique under the conditions of directional aerial.The sub-network division of system is by task-driven, subnet internal segment point-variable；Each subnet takes different frequency range communication, and gateway node supports full range to receive；Same subnet interior nodes are communicated using time division way.The process of realization is：Subnet division；Time slot is divided based on number of links, using the fixed slot allocation method being combined with dynamically distributes, topological maintenance, reservation dynamic slot are carried out with transmission services in fixed time slot；It is preferential to ensure high-priority service communication.Present invention reduces disturbing, improving spatial multiplex ratio, frequency spectrum resource is made full use of to reduce time delay, the maximization network handling capacity in limited resources, meets the transmission demand of each business, improve system communication efficiency.Access procedure suitable for the Distributed Flight device network for configuring directional aerial.

Description

Multi-frequency time division multiple access access system and method based on directional aerial
Technical field
The invention belongs to aircraft networks technical field, relates generally to the Distributed Flight device network multiple access under directional aerial Access technology, is specifically a kind of multi-frequency time division multiple access access system and method based on directional aerial, for Distributed Flight device Network.
Background technology
Antenna type used in Distributed Flight device network has both of which：Omnidirectional antenna and directional aerial.Before Propagation characteristic of the person in a certain plane (being usually horizontal plane) is identical, i.e., energy is spread evenly across all sides Upwards；And the latter then has beam directional, its effective coverage range is a sector region, and fan-shaped angle is directional aerial Beam angle.
Directional aerial allows sending node to transmit packet in a particular direction, while adjacent receiving node is in spy Packet is received on fixed direction.This explanation is needed mutual using the sending node and receiving node beam direction of directional aerial Alignment ability success communication, therefore the node in other directions can transmit packet using different zones, that is, utilize signal Different space propagation paths, the signal distinguishing of identical frequency, identical time slot, identical address code is come, and improves spatial reuse Property.On the other hand, by introducing directional aerial, under conditions of identical radiant power, can be obtained compared with omnidirectional antenna farther Coverage so that the hop count between node is possible to be reduced；The interference effect outside beam main lobe scope weakens at the same time, makes Time delay, the quality and stability performance for obtaining communication link are all significantly lifted.Therefore pass through in message transmission procedure The use of directional aerial is reasonably dispatched, the advantage of directional aerial is made full use of, in due course adjustment is carried out to its beam direction, from Analyze in theory, the performances such as throughput of system, link Lifetime can be effectively improved.
Most of existing Access Control Policy and service quality guarantee focus on node and use omnidirectional antenna transmission data Packet, it is more sensitive for network topology change caused by node motion.Particularly in the urgent row such as military combat, rescue and relief work , it is necessary to ensure connection and the real-time response of communication link when dynamic；Simultaneously because the movement velocity of node is higher, transmission link is easily The interruption that fracture causes communication occurs, and the route pathfinding process re-initiated can bring the propagation delay time of bigger.Due to letter The reasons, either improved routing algorithm or MAC protocol such as road is shared, multi-hop relay, or the mode using Subchannel divided, The throughput of system of Distributed Flight device network has a theoretical boundary.In this background, consider using another day Line type ----directional aerial, makes full use of the raising of its space reuse degree, can break through the bottleneck of wireless network transmissions capacity, into Expanding communication capacity again, and be combined with other multiple access technologies, maximally utilise resource limited in network.
Although it is excellent to be improved spatial multiplex ratio, increase transmission range etc. for configuration directional aerial in Distributed Flight device network Point, but mode and the neighbours such as traditional broadcast, multicast when cannot use configuration omnidirectional antenna due to the use of the node of directional aerial Node communicates, and the problem of can only be communicated by mode of unicast with other nodes, then some can be brought new, such as hide eventually End problem, deaf node problems etc., which dictates that communication time slot cannot use tradition to be based on number of nodes during design multiple access technique Measure the method divided.
And during using omnidirectional antenna, since node has identical gain in all directions, broadcast packe etc. can be passed through Mode sensing network topological structure, thus node positional information obtain it is not necessary to.And after using directional aerial, node Positional information become abnormal important, it plays certainly the direction of directional aerial when node will be oriented transmission or receive Qualitative effect, this neighbors under the conditions of beam communication to pinpoint the problems to first have to as Distributed Flight device network organizing Solve the problems, such as.
In addition, according to the business demand of Distributed Flight device network organizing, it is divided into control business and data transmission service.Control The Access Control Policy of Distributed Flight device network, Routing Protocol selection and the foundation and maintenance of topology are mainly completed in face processed, with The connectedness and reliability for ensureing whole net are target；Service surface mainly completes the service communications such as fast biography business, measurement business, to protect It is target to hinder the performances such as service quality.Chain of command is the premise of service surface Successful transmissions, it is necessary to rationally set chain of command and business The resource allocation methods in face, meet different communication requirements.So to node distribute time slot when must be by chain of command and service surface Isolation, it is impossible to by the way of traditional single assigned time slot.
Simultaneously because the multitask demand of Distributed Flight device network, aircraft number of nodes in each subnet can be according to appointing Business demand is different and changes, therefore the number of nodes of each subnet is not fixed.Then chain of command topology information is safeguarded in every frame Number of timeslots must also can adjust, could to subnet isolating with merge provide support.
The research for Distributed Flight device network is still in infancy at present, and access technology is focused on node and matched somebody with somebody mostly Put omnidirectional antenna, and since the present invention relates to aircraft such as satellites, presently relevant document is few, retrieves within the specific limits, So far the not no report closely related with the Distributed Flight device network multiple access method based on directional aerial, so design one The multiple access technique that kind is suitable under directional aerial scene is imperative.
The content of the invention
The purpose of the present invention is for the deficiency that omnidirectional antenna is configured in Distributed Flight device network, propose a kind of based on sky Between the good directional aerial of multiplexing performance multi-frequency time division multiple access access system and method.
The present invention is a kind of multi-frequency time division multiple access access system based on directional aerial first, includes node, link There are multiple subnets, each node configures directional aerial in Distributed Flight device network system, it is characterised in that sub-network division according to Task-driven, subnet interior nodes Number dynamics are variable；Each subnet takes different frequency range communication respectively, and gateway node supports full range to connect Receive；Same subnet interior nodes are in communication with each other using time division way.
Of the invention or a kind of multi-frequency time division multiple access cut-in method based on directional aerial, it is characterised in that：Including just like Lower step：
Step 1, sub-network division：To each sub-network division different frequency range, gateway node supports full range to receive, same subnet internal segment Point is in communication with each other by time division multiple access way.
Step 2, superframe is formed：Each superframe is divided into multi-frame and multi-frame in net between net, and multi-frame is divided between net frequently again between net Dynamic subframe between subframe and net is fixed between business frame, net, multi-frame is divided into duties frame in net, fixes in subframe and net and move in net again in net State subframe；Fixed subframe is made of multiple fixed time slots, and dynamic subframe is made of multiple dynamic slots.
(2a), which is based on fixing between time slot division and net in number of links division time slot, including net, fixes time slot division.
(2b) duties frame is used for earth station and injects information and the new neighbors of node progress blind sweep discovery to node；Fixed subframe Communicate for general communication and on demand, i.e., be on the one hand used for node interaction topology information, on the other hand, when node there are traffic packets Transmission demand when, realize packet transmission by preengaging dynamic slot resource to destination node；Dynamic subframe is mainly used on demand Successful service communication is preengage in communication, carries out dynamic service packet transmission between node.Use fixed allocation and dynamically distributes The slot allocation method being combined.
(2c) is when there is new node networking, if the fixation slotted communication of atom net can not be multiplexed, dynamic slot is changed into new Fixation time slot use.
Step 3, service quality guarantee：When the resource in network can not meet multiservice requirement, using high priority industry The method for being engaged in seizing low priority traffice resource, ensures the priority communication of high-priority service.
Compared with prior art, the present invention have the following advantages that：
1) present invention realizes that geographical location is believed under the conditions of directional aerial using the prior information of aerial vehicle trajectory or flight path Breath auxiliary, divides communication time slot based on number of links, makes full use of directional aerial strong antijamming capability, transmission range Far, the features such as spatial reuse performance is good, breaks through the bottleneck of wireless network transmissions capacity, exponentially expanding communication capacity, and and its He is combined multiple access technology, maximally utilises resource limited in network and improves throughput of system, link Lifetime etc. Performance.
2) the mixing access mode that the present invention is combined using time division multiple acess with frequency division multiple access, by dividing different frequencies Section is that different sub-network is serviced, and gateway node supports full range to receive, and task was isolated but also ensured mutual between netting between not only having realized subnet Even intercommunication.
3) same subnet interior nodes are in communication with each other using time division way in the present invention, using fixed allocation and dynamically distributes phase With reference to slot allocation method, fixed time slot carries out topological maintenance, reservation dynamic slot carries out business transmission, separate chain of command And service surface, it is ensured that all members in network can effectively get full mesh topology information, ensure chain of command connectedness and Reliability, meets the transmission requirement of service surface.
4) mechanism that the present invention seizes low priority traffice resource by high-priority service preferentially ensures high priority industry The service quality of business, when the resource in network can not meet the transmission demand of all business, ensures the excellent of high-priority service First communicate, traffic lost is preferably minimized as far as possible.
Brief description of the drawings
Fig. 1 is multi-frequency time division multiple access access system schematic diagram of the embodiment 1 based on directional aerial in the present invention；
Fig. 2 is multi-frequency time division multiple access cut-in method schematic diagram of the embodiment 3 based on directional aerial in the present invention；
Fig. 3 is the superframe format of embodiment 3 in the present invention；
Fig. 4 is that have in n node time-division distribution to fix time slot schematic diagram in 4 subnet of embodiment in the present invention (n is even number)；
Fig. 5 is that have in n node time-division distribution to fix time slot schematic diagram in 4 subnet of embodiment in the present invention (n is odd number)；
Fig. 6 is that have to fix time slot schematic diagram between x gateway node time-division distribution (x is even in 4 network of embodiment in the present invention Number)；
Fig. 7 is that have to fix time slot schematic diagram between x gateway node time-division distribution (x is strange in 4 network of embodiment in the present invention Number)；
Fig. 8 is the communication flow diagram of multi-frequency time division multiple access cut-in method of the embodiment 5 based on directional aerial in the present invention；
Fig. 9 is the situation for having in the present invention in 8 subnet of embodiment 4 nodes；
Figure 10 is that have in 4 node time-division distributions to fix time slot schematic diagram in 8 subnet of embodiment in the present invention；
Figure 11 is the situation for having in the present invention in 8 subnet of embodiment 5 nodes；
Figure 12 is that have in 5 node time-division distributions to fix time slot schematic diagram in 8 subnet of embodiment in the present invention；
Figure 13 is multi-frame frame format schematic diagram in the net of embodiment 8 in the present invention；
Figure 14 is multi-frame frame format schematic diagram between the net of embodiment 8 in the present invention；
Figure 15 is the communication process of 9 same subnet interior nodes A of embodiment and node B in the present invention；
Figure 16 is the geographical location information bag form of embodiment 9 in the present invention；
Figure 17 is the local dynamic slot occupancy table of 9 node A of embodiment in the present invention；
Figure 18 is that 9 node A of embodiment preengages bag form to the dynamic slot that node B is sent in the present invention；
Figure 19 is the dynamic slot reservation bag form that 10 node C of embodiment is sent to node B in the present invention (priority is low)；
Figure 20 is the dynamic slot reservation bag form that 10 node C of embodiment is sent to node B in the present invention (priority is high).
Embodiment
Below in conjunction with the accompanying drawings to the detailed description of the invention
Embodiment 1
Nowadays the whole world enters the information age comprehensively, and the importance of acquisition of information is embodied in economic activity and social activities Every aspect.Wherein to the acquisition capability of air information, a national comprehensive strength is more presented with it in international community In influence power.And air information is mainly obtained by aircraft such as satellites, therefore the development of aircraft networks technology, determine Can the acquisition of air information effective rapidly.The research of Distributed Flight device network at present is still in infancy with application, And access technology focuses on node configuration omnidirectional antenna mostly, the Distributed Flight device network for being not based on directional aerial so far is more Location cut-in method proposes, the present invention for technical need propose a kind of multiple access system being suitable under directional aerial scene and Method.
The present invention is a kind of multi-frequency time division multiple access access system based on directional aerial, includes the distribution of node, link There are multiple subnets, each node configures directional aerial, and sub-network division is according to task-driven, in subnet in formula aircraft networks system Number of nodes dynamically changeable；Each subnet takes different frequency range communication respectively, and gateway node supports full range to receive；Same subnet internal segment Point is in communication with each other using time division way.
Since Distributed Flight device network task demand is various, the present invention is towards specific tasks dynamic group net, i.e., in network There is stronger purpose, each task there are multiple tasks subnet, and according to network overall tasks demand, the movement of node Node dynamic resolution in net is with combining so as to which the set for forming a collaborative work, interconnecting is appointed with efficiently completing more height Business.And the present invention is serviced by dividing different frequency range for different sub-network, gateway node supports full range to receive, and can realize Task isolates and in turn ensure that the interconnection and interflow of network between subnet.Referring to Fig. 1, Fig. 1 is based on the more of directional aerial in the present invention Frequency time division multiple acess access system schematic diagram, is 2 two different subnets of subnet 1 and subnet in dotted line circle, if having in each subnet Dry aircraft node, cooperative cooperating perform the task that this subnet is connected to；Node acquisition frequency f in subnet 11, use the time-division The mode of multiple access (TDMA) communicates, the node acquisition frequency f in subnet 22, also mutually communicated using the mode of time division multiple acess (TDMA) Letter；Gateway node supports full range to receive, therefore the gateway node of subnet 1 is in frequency f1Communicate with the gateway node of subnet 2, and it is sub The gateway node of net 2 is in frequency f2Communicate with the gateway node of subnet 1.
Embodiment 2
The overall of multi-frequency time division multiple access access system based on directional aerial is formed with embodiment 1, same son in the present invention The communication time slot of net interior nodes is divided based on number of links.Communication uses in the net of subnet 1 and subnet 2 in specifically Fig. 1 The part of time division multiple acess (TDMA) mode.
Due to the limitation of the factors such as shadowing effect, communication distance, cover time, aircraft be not can keep always with The communication of earth station, cannot directly be needed at this time with the node of earth station's communication could sensing network with surroundings nodes interactive information Topology.Under the conditions of directional aerial, when using mode of unicast to communicate between node, if no reasonable distribution time or do not know deposits Collision problem can be then produced in neighbors to be communicated.
Therefore, it is same in of the invention in order to ensure all members in network can effectively get full mesh topology information The communication time slot of subnet interior nodes based on number of links using being divided, rather than traditional is divided based on number of nodes Method, is to distribute a time slot per a pair of of communication node, for this to node interactive information.In the present invention quantity of time slot by The number of links of communication node determines, ensures that the node in each subnet is at least completed with other nodes in subnet in a frame Once communicate to interact topology information.
Embodiment 3
Of the invention or a kind of multi-frequency time division multiple access cut-in method based on directional aerial, above-mentioned based on directional aerial Multi-frequency time division multiple access access system realize that the overall of the multi-frequency time division multiple access access system based on directional aerial is formed with implementing Example 1-2.Referring to Fig. 2, the multi-frequency time division multiple access cut-in method based on directional aerial includes having the following steps：
Step 1, sub-network division：To each sub-network division different frequency range, gateway node supports full range to receive, same subnet internal segment Point is in communication with each other by time division multiple access way.
Step 2, superframe is formed：Each superframe is divided into multi-frame and multi-frame in net between net, and multi-frame is divided between net frequently again between net Dynamic subframe between subframe and net is fixed between business frame, net, multi-frame is divided into duties frame in net, fixes in subframe and net and move in net again in net State subframe；Fixed subframe is made of multiple fixed time slots, and dynamic subframe is made of multiple dynamic slots.Referring to subnet in Fig. 31 The superframe format of the subnet such as superframe format, subnet 2, subnet 3, subnet 4 is with subnet 1, and the communications band that simply each subnet takes is not Together.Duties frame is made of duties time slot between 2 nets between wherein netting, and subframe is fixed between net and is formed by fixing time slot between x net, between net Dynamic subframe is made of dynamic slot between y net；Duties frame is made of duties time slot in 2 nets in net, and subframe is fixed in net by n Time slot composition is fixed in a net, dynamic subframe is made of dynamic slot in m net in net.X, y, n, m are integer and more than 0.
(2a), which is based on fixing between time slot division and net in number of links division time slot, including net, fixes time slot division.
(2b) duties frame is used for earth station and injects information and the new neighbors of node progress blind sweep discovery, the letter of injection to node Breath includes the geographical location information of node.Fixed subframe is used for general communication and communicates on demand, is on the one hand interacted for node Topology information, on the other hand, when node has traffic packets to need to be transmitted to the node of present communications, fixed time slot to Destination node preengages dynamic slot resource to complete packet transmission.Dynamic subframe is mainly used for preengaging successful industry in communicating on demand Business communication, carries out dynamic service packet transmission between node.
The present invention has fixed time slot to distribute in traffic packets transmitting procedure, also there is dynamic time slot allocation, using fixed point With the slot allocation method being combined with dynamically distributes.
(2c) is when there is new node networking, if the fixation slotted communication of atom net can not be multiplexed, dynamic slot is changed into new Fixation time slot use.
Step 3, service quality guarantee：When the resource in network can not meet multiservice requirement, using high priority industry The method for being engaged in seizing low priority traffice resource, ensures the priority communication of high-priority service.
The present invention realizes geographical location information under the conditions of directional aerial using the prior information of aerial vehicle trajectory or flight path Auxiliary, divides communication time slot based on number of links, reduces interference, improves spatial multiplex ratio, so as to effectively avoid using The problem of directional aerial is brought.The multi-frequency time division multiple access access way being combined at the same time using fixed allocation with dynamically distributes, every From chain of command and service surface, topological maintenance, reservation dynamic slot progress business transmission are carried out in fixed time slot, both ensures network It is connective to complete the high-speed transfer of packet as far as possible again, and make full use of frequency spectrum resource to reduce time delay, improve the communication effect of system Rate；When resources in network can not meet multiservice requirement, the machine of low priority traffice resource is seized using high-priority service The preferential service quality for ensureing high-priority service of system.
Embodiment 4
Multi-frequency time division multiple access access system and method based on directional aerial with embodiment 1-3, cut-in method of the present invention Time slot is divided based on number of links described in step (2a), is included the following steps：
Time slot division is fixed in (2a1) net：In n node subnet of configuration directional aerial (n be integer, n >=2), it is total to In the presence ofBar link, if the number of nodes n in subnet is even number, each time slot at most communicates, it is necessary to divide node for n/2 (n-1) time slot is fixed in a net, time slot is fixed in net and distributes schematic diagram referring to Fig. 4；Fig. 4 is that have even number in the present invention in subnet Time slot schematic diagram, wherein A are fixed in the distribution of node time-division1, A2... ..., AnFor nodal scheme, A1—A2Represent node A1With node A2Two-way communication, and so on.If n is odd number, each time slot is at most communicated for (n-1)/2 pair node, it is necessary to divide n Time slot is fixed in net, time slot is fixed in net and distributes schematic diagram referring to Fig. 5；Fig. 5 is when having odd number node in the present invention in subnet Time slot schematic diagram is fixed in distribution net, this node of node on behalf identified with square frame cannot communicate in the time slot with other nodes.
Time slot division is fixed between (2a2) net：(x is integer, x in configuration directional aerial has the network of x gateway node >=2), co-existed between gateway nodeBar link, if x is even number, each time slot at most communicates gateway node for x/2, needs Divide and fix time slot between (x-1) a net, time slot is fixed between net and distributes schematic diagram referring to Fig. 6；Fig. 6 is that have even number in the present invention Time slot schematic diagram, wherein B are fixed between the distribution of gateway node time-division1, B2... ..., BxFor gateway node label, B1—B2Represent gateway Node B1With gateway node B2Two-way communication, and so on.If x is odd number, each time slot is at most for (x-1)/2 pair node Time slot is fixed between communicating, it is necessary to divide x net, time slot is fixed between net and distributes schematic diagram referring to Fig. 7；Fig. 7 is that have in the present invention very Time slot schematic diagram is fixed between several gateway node time-division distributions, the gateway node identified with square frame represents this gateway node at this Gap cannot communicate with other gateway nodes.
Since can the direction of directional aerial play a decisive role be communicated node, so the positional information of node Become abnormal important so that the neighbor node under the conditions of directional aerial is pinpointed the problems to be determined as aircraft distributed network networking First have to solve the problems, such as to communication.And since task-driven, the track of aircraft or flight path have certain predictability, then The position of aircraft, the connected relation of inter-node link and can communication section at different moments can determine that by constellation configuration or relevant parameter Relative position between point, if topology information is injected aircraft networks by earth station's cycle, can greatly shorten network topology foundation With the time delay of maintenance, network overhead is effectively reduced.But due to shadowing effect, satellite elevation angle, communication distance, cover time etc. because The limitation of element, aircraft node is not the communication that can be kept always with earth station, cannot directly be communicated at this time with earth station Node need with surroundings nodes interactive information could sensing network topology.
Due to the unicast characteristic of directional aerial, only the node equipped with a set of dual-mode antenna can only be with one in a period Node communicates.In order to ensure all members in network can effectively get full mesh topology information, ensure chain of command Connectedness, node of the present invention each in subnet at least need once to communicate with other node guarantees in subnet in a frame, That is it is necessary in net at least distributing in a net per a pair of of communication link in a frame and fixes time slot, for this in node Interactive Network Topology information；And each gateway node also at least needs to ensure once to communicate with other gateway nodes in network in a frame, i.e., At least being distributed per a pair of of communication link between a net for gateway node is necessary in one frame and fixes time slot, is interacted for gateway node The topology information of this subnet, ensures the reliability of communication system.
Technical solution of the present invention determines that communication time slot must be based on number of links and be divided, rather than it is traditional based on Number of nodes is divided, therefore the number of timeslots of the present invention is determined by the number of links of communication node.But also due to orientation day The spatial reuse of line, the node in other directions can transmit packet in the same time using different zones, because at this time Gap quantity can greatly save, and corresponding communication delay can also reduce therewith.
Embodiment 5
Multi-frequency time division multiple access access system and method based on directional aerial are with embodiment 1-4, the duty described in step (2b) Business frame is used for earth station and injects information and the new neighbors of node progress blind sweep discovery to node.Fixed subframe be used for general communication and Communicate on demand, on the one hand interact topology information for node, on the other hand, when node has the transmission demand of traffic packets, lead to Cross to destination node reservation dynamic slot resource and realize packet transmission.Dynamic subframe is mainly used for preengaging in communicating on demand successful Service communication, carries out dynamic service packet transmission between node.Referring to the communication flow diagram of Fig. 8, including have the following steps：
Information is injected by (2b1) duties Zheng Zhong earth stations and node carries out blind sweep：Subnet interior nodes duties frame in net arrives When, topology information that satellite receiver is injected to subnet, and carry out blind sweep and find new neighbors, the behaviour such as is networked with completing new node Make；Gateway node is when duties frame arrives between net, topology information that satellite receiver is injected to gateway node, and carries out blind sweep hair Now new neighbors, to complete the operations such as new node networking.
Geographical location information bag is sent in (2b2) fixed subframe：Subnet interior nodes fix time slot and phase in the net of distribution Neighbor node interacts member's geographical location information in this subnet collected by oneself in the net answered, and writes geographical location information in net Sent in bag, include each node ID number and corresponding longitude and latitude and height in net in net in geographical location information bag；Gateway Node fixes the geographical location information that time slot interacts this subnet with corresponding purpose gateway node between the net of distribution, between write-in is netted Sent in geographical location information bag, include subnet number and this subnet longitude, latitude and height between net in geographical location information bag The bound of degree.
Geographical location information table is updated in (2b3) fixed subframe：Destination node updates certainly after receiving geographical location information bag Originally without the geographical location information of member or each subnet in the net grasped in own geographical location information table.
Dynamic slot reservation bag is sent in (2b4) fixed subframe：If source node has traffic packets to need to present communications Node is transmitted, then a dynamic slot reservation bag is sent after geographical location information bag is transmitted, pre- to destination node About dynamic slot resource is transmitted with completing packet；Source node will not only identify source and destination node address in reservation bag, it is also necessary to The number of timeslots for oneself needing to preengage and oneself current idle dynamic slot number are indicated, finally marks the excellent of upper traffic packets First level is in order to subsequently realizing high priority security mechanism.If destination node is in this subnet, when source node is fixed in net Gap dynamic slot into destination node reservation net；If destination node, not in this subnet, node fixes time slot to originally in net Business, is first transmitted at the gateway node of this subnet, gateway node then may be used by dynamic slot in the gateway node reservation net of subnet Time slot is fixed between net to dynamic slot between the gateway node reservation net of purpose subnet, to carry out the inter-network of book network service biography It is defeated.
Destination node carries out response to the reservation information of source node in (2b5) fixed subframe：Destination node receives source node After the dynamic slot reservation bag of transmission, the dynamic slot occupancy table of oneself is checked, according to oneself current free timeslot situation pair The reservation of source node carries out response, in response bag comprising source and destination node address, whether agree to reserving time slots and distribution when Gap number, while correspondingly change local dynamic slot and take table.
It is prepared in (2b6) fixed subframe according to response message：Source node receives the dynamic slot reservation of destination node After response bag, the dynamic slot occupancy table of oneself is updated, prepares the transmission of follow-up business packet according to response message, so far preengages Process is completed.
Business is sent in (2b7) dynamic subframe：When the dynamic slot that both sides consult arrives, source node sends business point Group, destination node reply an ACK confirmation message to source node after each time slot harvests packet and represent that oneself has been properly received To traffic packets, so far a service communication process completion.
The transmission of (2b8) business continuing judges：A communication process is caused not transfer if the portfolio of node is excessive, When the fixation time slot that next frame communicates with destination node arrives, return to step (2b4) is transmitted to destination node reserving time slots again Data packet, performs step (2b4) to step (2b7), until the business whole end of transmission of the node.
The business demand of aircraft distributed network networking is divided into control business and data transmission service, and different business is real Existing target is different.Chain of command mainly completes the Access Control Policy of Distributed Flight device network, Routing Protocol selection and topology Establish and safeguard, to ensure the connectedness of whole net, reliability as target；Service surface mainly completes data transmission service, measurement industry The service communications such as business, using the performance such as ensure service quality as target.Chain of command is the premise of service surface Successful transmissions.
Same subnet interior nodes are in communication with each other using time division way in the present invention, and time slot uses fixed allocation and dynamically distributes The slot allocation method being combined, topological maintenance, reservation dynamic slot progress business transmission, separation control are carried out in fixed time slot Face and service surface, it is ensured that all members in network can effectively get full mesh topology information, ensure chain of command connectedness, Reliability, meets the data transportation requirements of service surface, and chain of command and service surface are isolated, rationally set resource allocation methods, full The sufficient chain of command QoS requirement different with service surface.
Embodiment 6
Multi-frequency time division multiple access access system and method based on directional aerial are with embodiment 1-5, the mesh described in step (2b5) Node receive source node transmission dynamic slot reservation bag after, check the dynamic slot occupancy table of oneself, it is current according to oneself Reservation of the free timeslot situation to source node carry out response, i.e., in fixed subframe destination node to the reservation information of source node into Row response, is divided into 4 kinds of situations：
(2b5.1) the destination node free timeslot number quantity consistent with source node free timeslot number is more than the reservation of source node Demand, then randomly choose x time slot in source node free timeslot number, response message be sent back to, and wherein x is pre- for source node The about quantity of dynamic slot.
(2b5.2) the destination node free timeslot number quantity consistent with source node free timeslot number is equal to the reservation of source node Demand, then select this consistent x time slot of number, response message be sent back to, and wherein x is that source node preengages dynamic slot Quantity.
(2b5.3) the destination node free timeslot number quantity consistent with source node free timeslot number is less than the reservation of source node Demand, then select the consistent y time slot of number, response message be sent back to, and wherein y is the consistent quantity of free timeslot number, x The quantity of dynamic slot, y ≠ 0 and y ＜ x are preengage for source node.
(2b5.4) the destination node free timeslot number quantity consistent with source node free timeslot number is 0, then in response message Disagree the reserve requests of source node.
Oriented mission demand of the present invention, i.e., when certain node has traffic packets to need to send, just in the fixation time slot of oneself The interior request for sending reservation dynamic slot, destination node make corresponding reply according to local resource occupancy situation.Both can eliminate Because collide without being successfully transmitted reserve requests caused by retransmit, and as much as possible not the business transmission demand to each node, Consumption of Internet resources etc. causes to significantly affect.
Embodiment 7
Multi-frequency time division multiple access access system and method based on directional aerial work as network with embodiment 1-6 described in step 3 When middle resource can not meet multiservice requirement, method that low priority traffice resource is seized using high-priority service, is ensured high The priority communication of priority service, including have the following steps：
(3a) if source node when corresponding fixed time slot has consulted the dynamic of subsequent transmission business with destination node After gap, another node also has traffic packets to need to be sent to the destination node, is divided into 2 kinds of situations at this time：
(3a1) situation 1, the rear priority to reservation bag are less than or equal to the priority for arriving first reservation bag, then destination node Perform step (2b5.1)~(2b5.4) and carry out response to later reservation message in remaining free timeslot.
(3a2) situation 2, the rear priority to reservation bag are more than the priority for arriving first reservation bag, perform following steps：
Dynamic slot of original planned assignment to low priority reservation bag is allocated to high priority by (3a2.1) destination node Node；
(3a2.2) confiscates destination node and returns when lower-priority data bag sends business in the dynamic slot consulted Multiple ACK confirmation messages, then it is assumed that traffic packets are not sent to destination node successfully, step (2b4)~(2b8) are performed, under Once fix again to destination node reserving time slots transmission packet when time slot arrives, until the business of the node all successfully passes It is defeated.
Due to the multiservice requirement of Distributed Flight device network, the performance requirement of service with different priority levels is different.And network Resource is limited, and the present invention ensures high-priority service when resource can not meet the needs of all kinds of business at the same time in a network Priority communication, traffic lost is preferably minimized as far as possible, optimizes overall plan.
Several more detailed specific examples are given below, the present invention is further described.
Embodiment 8
Multi-frequency time division multiple access access system and method based on directional aerial orient day with embodiment 1-7, this example from configuration The Distributed Flight device network of line sets out, and the situation for having 4 nodes out of a subnet is extended to 5 nodes again to n node Ordinary circumstance, to illustrate the method for dividing fixed time slot in the present invention based on number of links.Assuming that have 4 in some subnet at present A node A1、A2、A3、A4, as shown in figure 9, then there are A in this subnet1—A2、A1—A3、A1—A4、A2—A3、A2—A4With A3—A4Totally 6 different links (assuming that communication is two-way), need 6 fixed time slots of division in theory, but due to orienting Spatial reuse, i.e. A can be achieved under communication environment1—A2A while communication3—A4It can also communicate, so actually only needing 3 fixed time slots are divided, as shown in Figure 10.Similarly, if there are 5 nodes in this subnet, 10 different links are co-existed in, But need to only divide 5 fixed time slots can meet that needs are completed with other nodes in net in a frame for node in each subnet Communication task, as is illustrated by figs. 11 and 12.
Being extended in this subnet has n node (n be integer, n >=2), as described in step (2a1), co-exists at this time Bar link.If n is even number, each time slot at most communicates node for n/2；If n is odd number, each time slot is at most for (n- 1)/2 pair node communicates.Number of timeslots s is fixed in the net for needing to divide to be at least：
According to the maximum multiplexing principle in space (the number of links capping that i.e. each fixed time slot can distribute), if n is even Count, n node (A in subnet1~An) the fixation time slot that communicates two-by-two in a frame once at least needs that division (n-1) is a, and distribution is shown It is intended to as shown in Figure 4；If n is odd number, the fixation time slot that n node communicates once two-by-two in a frame in subnet at least needs to draw Point n, distribution schematic diagram must then have a node not have and other nodes as shown in figure 5, since n be odd number in each time slot Communication, is identified with square frame.
Duties frame 1 gives subnet to inject topology information for earth station in net, and duties frame 2 is used for node progress blind sweep hair in net Now new neighbors, to complete the operations such as new node networking；Portfolio of the dynamic slot in actual scene determines in a frame Quantity, be set to m herein, be mainly used for node carry out business transmission.After new node networks, if consolidating for atom net can not be multiplexed Determine slotted communication, the fixation time slot that dynamic slot can be changed into new uses.Then in the subnet that n node is formed, in a net The frame format of multi-frame is as shown in figure 13.
As described in step (2a2) in configuration directional aerial has the network of x gateway node (x be integer, x >=2), net Co-existed between artisBar link.If x is even number, each time slot at most communicates gateway node for x/2；If x is odd number, Each time slot at most communicates for (x-1)/2 pair node.Number of timeslots s is fixed between the net for needing to divide to be at least：
Fixed time slot distribution schematic diagram such as Fig. 6 (x is even number) and Fig. 7 (x is odd number) are shown.
Multi-frame is outwards transmitted for the business of this subnet between net.Duties frame 1 gives gateway node to inject for earth station between net Topology information, duties frame 2 is used for gateway node and carries out blind sweep and find new node the operation such as networking to complete new node between net；Between net On the one hand fixed subframe is used for gateway node interaction topology information, on the other hand, when this subnet has traffic packets to need across subnet During transmission, then gateway node is transmitted in fixed time slot to dynamic slot between purpose gateway node reservation net with completing packet；Between net Dynamic subframe is just mainly used for the sound cross network transmission that gateway node completes book network service, and when gateway node increasing number, if The fixation slotted communication of division originally can not be multiplexed, the fixation time slot that dynamic slot can be changed into new uses.Multi-frame between one net Frame format it is as shown in figure 14.
Due to the unicast characteristic of directional aerial in the present invention, only the node equipped with a set of dual-mode antenna is in a period It can communicate with a node, in order to ensure all members in network can effectively get full mesh topology information, ensure The connectedness of chain of command, the node in each subnet at least need once to lead to other node guarantees in subnet in a frame Believe, is i.e. every a pair of of communication link is necessary in a frame and at least distributes a fixed time slot, topology information is interacted to node for this； It is and each gateway node also at least needs to ensure once to communicate with other gateway nodes in network in a frame, i.e. necessary in a frame At least distributed per a pair of of communication link for gateway node and fix time slot between a net, opening up for this subnet is interacted for gateway node Flutter information.Therefore communication time slot is divided based on number of links in the present invention, rather than traditional based on number of nodes progress Division, then the quantity of time slot is determined by the number of links of communication node.But also due to the spatial reuse of directional aerial, its other party To node can transmit packet using different zones in the same time, therefore number of timeslots can greatly save, phase The communication delay answered can also reduce therewith.
Embodiment 9
Multi-frequency time division multiple access access system and method based on directional aerial pass through analysis distribution with embodiment 1-8, this example The communication process of the subnet interior joint A and node B of formula aircraft networks, to illustrate fixed allocation and dynamic point in the present invention With the slot allocation method being combined, referring to Figure 15.
Duties frame described in step (2b) is used for earth station and injects information and the new adjacent section of node progress blind sweep discovery to node Point；On the one hand fixed subframe is used for node interaction topology information, on the other hand, when node has traffic packets to need to present communications Node be transmitted, then to destination node preengage dynamic slot resource in fixed time slot to complete packet transmission；Dynamic subframe Traffic packets are transmitted between being then mainly used for node, are included the following steps：
(2b1) subnet interior nodes when duties frame arrives in net, go forward side by side by topology information that satellite receiver is injected to subnet Row blind sweep finds new neighbors, to complete the operations such as new node networking；
(2b2) subnet interior nodes are fixed time slot in the net of distribution and are interacted with neighbor node in corresponding net collected by oneself This subnet in member's geographical location information, send in geographical location information bag in write-in net, geographical location information in net Each node ID number and corresponding longitude and latitude and height in net are included in bag, geographical location information bag form is as shown in figure 16 in net. Assuming that the fixed communication time slot for distributing to node A and node B is fixed time slot 1, then node A first and node B is in fixed time slot 1 The whole network member's geographical location information collected by middle this node of interaction.Specifically perform geographical in the net of the 1. node A in Figure 15 Positional information bag is sent to node B, and geographical location information bag is sent to node A in the net of the 3. node B in Figure 15.
(2b3) destination node is received to update after geographical location information bag in oneself geographical location information table and not grasped originally Net in the geographical location information of member or each subnet.Specifically perform the 2. node B renewal local geographicals position letter in Figure 15 Cease the 4. node A renewal local geographical positional information tables in table, and Figure 15.
(2b4) is if source node has traffic packets to need to be transmitted to the node of present communications, in geographical location information Bag sends a dynamic slot reservation bag after being transmitted, preengage dynamic slot resource to destination node to complete packet transmission. Source node will not only identify source and destination node address in reservation bag, it is also necessary to indicate oneself need the number of timeslots preengage and Oneself idle dynamic slot number at present, finally marks the priority of upper traffic packets in order to subsequently realize high priority guarantee Mechanism.Even node A has traffic to send to node B, it is necessary to take 3 dynamic slot transmission, then node A is handed over node B After mutual complete geographical location information, 3 dynamic slots are preengage to node B, if the 5. node A specifically performed in Figure 15 has traffic to When being sent to node B, and 6. node A in Figure 15 sends dynamic slot reservation bag to node B.The local dynamic of node A at this time Time Slot Occupancy table is as shown in figure 17, it is known that free timeslot number current node A is 1,2,4,6, then node A is sent to node B Dynamic slot reservation bag form is as shown in figure 18.
After (2b5) destination node receives the dynamic slot reservation bag of source node transmission, check that the dynamic slot of oneself takes Table, carries out response according to oneself reservation of the current free timeslot situation to source node, source and destination node is included in response bag Whether address, agree to reserving time slots and the timeslot number of distribution, is broadly divided into 4 kinds of situations：
(2b5.1) the destination node free timeslot number quantity consistent with source node free timeslot number is more than the reservation of source node Demand, then randomly choose x time slot (x is the quantity that source node preengages dynamic slot) in source node free timeslot number, should Message is answered to be sent back to.Even the current free timeslots number of node B are 1,2,3,4,6,7, then 3 are randomly choosed in 1,2,4,6 Time slot is allocated to node A；
(2b5.2) the destination node free timeslot number quantity consistent with source node free timeslot number is equal to the reservation of source node Demand, then select this x time slot (x preengages the quantity of dynamic slot for source node) that number is consistent, response message sent back Go.Even the current free timeslots number of node B are 1,3,4,6,7,8, then select 1,4,6 this 3 time slots to be allocated to node A；
(2b5.3) the destination node free timeslot number quantity consistent with source node free timeslot number is less than the reservation of source node Demand, then select this consistent y time slot (y is the consistent quantity of free timeslot number, y ≠ 0 and y ＜ x) of number, by response message It is sent back to.Even the current free timeslots number of node B are 1,3,4,7,8, then select 1,4 this 2 time slots to be allocated to node A；
(2b5.4) the destination node free timeslot number quantity consistent with source node free timeslot number is 0, then in response message Disagree the reserve requests of source node.Even the current free timeslots number of node B are 3,5,7,8, then cannot divide time slot to node A；
Destination node correspondingly changes local dynamic slot occupancy table at the same time, and the 7. node B specifically performed in Figure 15 is looked into See local dynamic slot occupancy table, dynamic slot is divided to node A, and update local dynamic slot occupancy table, and in Figure 15 8. node B sends dynamic slot reservation response bag to node A.
After (2b6) source node receives the dynamic slot reservation response bag of destination node, update the dynamic slot of oneself and take Table, prepares the transmission of follow-up business packet according to response message, when specifically performing the 9. node A renewals local dynamic in Figure 15 Gap takes table, and preparation service is sent.So far reservation process is completed.
(2b7) when dynamic slot that both sides consult arrives, source node sends traffic packets, and destination node is when each Gap harvest packet after to source node reply an ACK confirmation message represent that oneself has been successfully received traffic packets.So far once Service communication process is completed.The 10. node A specifically performed in Figure 15 is sent in business data packet, and Figure 15 to node B After node B is successfully received data packet, ACK confirmation messages are replied to node A.
(2b8) causes a communication process not transfer if the portfolio of node is excessive, next frame and destination node Again to destination node reserving time slots transmission packet when the fixation time slot of communication arrives.Even there is (2b5.3) and (2b5.4) Both of these case, at this time the demand of node A be not met, then the fixation time slot arrival to communicate with B to next frame node A When, return to step (2b4) to node B reserving time slots transmission packets, that is, performs step (2b4) to step (2b7) again, until The business whole end of transmission that node A need to be transmitted to B.
The slot allocation method that the present invention is combined using fixed allocation with dynamically distributes, topological dimension is carried out in fixed time slot Shield, reservation dynamic slot carry out business transmission, separate chain of command and service surface, it is ensured that all members in network can effectively obtain Full mesh topology information is got, ensures the connectedness and reliability of chain of command, meets the transmission requirement of service surface.
Embodiment 10
Multi-frequency time division multiple access access system and method based on directional aerial are same with embodiment 1-9, the concrete scheme of this example Embodiment 9, has extension on the basis of embodiment 9, and follow-up transmission business is consulted by analyzing subnet interior joint A and node B Dynamic slot after, node C also carries out the situation of business transmission in fixed time slot 2 to node B reservation dynamic slots, to illustrate this High-priority service seizes the mechanism of low priority traffice resource in invention.It can not meet when resources in network described in step 3 During multiservice requirement, method that low priority traffice resource is seized using high-priority service preferentially ensures high-priority service Service quality, include the following steps：
After (3a) is if source node consulted the dynamic slot of subsequent transmission business with destination node, another node There are traffic packets to need to be sent to the destination node.Assuming that the current free timeslots number of node B be 1,3,4,6,7,8, then select 1, 4th, 6 this 3 time slots are allocated to node A.Then node C also preengages 3 dynamic slots to node B in fixed time slot 2 and carries out business Transmission, is broadly divided into 2 kinds of situations at this time：
(3a1) situation 1, the rear priority to reservation bag are less than or equal to the priority for arriving first reservation bag, then destination node Perform step (2b5.1)~(2b5.4) and carry out response to later reservation message in remaining free timeslot.Such as node A's is excellent First level is 2, and the priority of node C is also 2, and the reservation bag form of node C is as shown in figure 19, it is known that the free timeslot number of node C For 1,3,4.The priority of node C is identical with node A, it is impossible to seizes the resource of node A, then node B only can be in remaining sky Time slot is selected to be allocated to node C in idle gap i.e. 3,7,8.Since overlapping slot number only has No. 3 time slots, then node B is only by No. 3 Time slot is allocated to node C.The demand of node C is not met for, then the fixation time slot that next frame communicates with B can be again when arriving To node B reserving time slots transmission packets.
(3a2) situation 2, the rear priority to reservation bag are higher than the priority for arriving first reservation bag, such as the priority of node A For 2, the priority of node C is 1, and the reservation bag form of node C is as shown in figure 20.Following steps are performed at this time：
Dynamic slot of original planned assignment to low priority reservation bag is allocated to high priority by (3a2.1) destination node Node.The priority ratio node A high of node C, can seize the resource of node A, then node B will time slot 1,3,4 strokes Give node C.
(3a2.2) confiscates destination node and returns when lower-priority data bag sends business in the dynamic slot consulted Multiple ACK confirmation messages, then it is assumed that traffic packets are not sent to destination node successfully, step (2b4)~(2b8) are performed, under Once fix again to destination node reserving time slots transmission packet when time slot arrives, until the business of the node all successfully passes It is defeated.Node A is not aware that original node B has been seized to the time slot 1 and 4 oneself divided by node C, still can be in time slot 1 and 4 Traffic packets are sent to node B.But communicate since node B is oriented with node C, the traffic packets that node A is sent are can not receive, together Sample will not reply the ACK confirmation messages for being properly received traffic packets to A, and node A does not receive the confirmation message of node B, then It can be appreciated that the traffic packets of oneself are not sent to node B, the transmission demand equivalent to traffic packets is not met for, institute The fixation time slot to be communicated with next frame with B can be again to node B reserving time slots transmission packets, until being successfully transmitted industry when arriving Untill business packet.
The mechanism that the present invention seizes low priority traffice resource by high-priority service preferentially ensures high-priority service Service quality, when the resource in network can not meet business transmission demand, ensure the priority communication of high-priority service, to the greatest extent Amount is preferably minimized traffic lost.
Letter and state it, the invention discloses a kind of multi-frequency time division multiple access access system and method based on directional aerial, solution The technical problem for the Distributed Flight device network multiple access access determined under the conditions of directional aerial.The sub-network division of multiple access system By task-driven, subnet interior nodes Number dynamics are variable；Each subnet takes different frequency range communication, and gateway node supports full range to connect Receive；Same subnet interior nodes are communicated using time division way.The process of realization is：Subnet division；Time slot is carried out based on number of links to draw Point, the slot allocation method being combined using fixed allocation with dynamically distributes；The preferential service quality for ensureing high-priority service. The present invention realizes that geographical location information aids in using the prior information of aerial vehicle trajectory or flight path, during based on number of links to communication Gap is divided, and is reduced interference, is improved spatial multiplex ratio, so as to effectively avoid the problem that bringing using directional aerial.Adopt at the same time The multi-frequency time division multiple access cut-in method being combined with fixed allocation with dynamically distributes, isolates chain of command and service surface, when fixing Gap carries out topological maintenance, preengages dynamic slot progress business transmission, had not only ensured the connectedness of network but also had completed packet height as far as possible Speed transmission, and make full use of frequency spectrum resource to reduce time delay, improve system communication efficiency；When resources in network can not meet multi-service During demand, the mechanism of low priority traffice resource is seized using high-priority service, the preferential service for ensureing high-priority service Quality.The present invention is directed to the constraints such as various business in Distributed Flight device network, node dynamic mobile, spaceborne condition harshness, profit It is good with the prior information and directional aerial strong antijamming capability, long transmission distance, spatial reuse performance of aerial vehicle trajectory or flight path The features such as ensure connection and the real-time response of communication link, reduce time delay, reduce expense, when passing through reasonable distribution, frequency, empty multidimensional Resource, the maximization network handling capacity in limited resource, realizes the service quality guarantee of different business, is oriented suitable for configuration The access procedure of the Distributed Flight device network of antenna.

Claims (7)

1. a kind of multi-frequency time division multiple access access system based on directional aerial, includes the Distributed Flight device net of node, link There are multiple subnets, each node configures directional aerial, it is characterised in that sub-network division is according to task-driven, subnet in network system Interior nodes Number dynamics are variable；Different frequency range communication is taken between each subnet respectively, gateway node supports full range to receive；Same subnet Interior nodes are in communication with each other using time division way.
2. the multi-frequency time division multiple access access system according to claim 1 based on directional aerial, it is characterised in that same son The communication time slot of net interior nodes is divided based on number of links.
A kind of 3. multi-frequency time division multiple access cut-in method based on directional aerial, it is characterised in that：Including having the following steps：
Step 1, sub-network division：To each sub-network division different frequency range, gateway node supports full range to receive, and same subnet interior nodes are led to Time division multiple access way is crossed to be in communication with each other；
Step 2, superframe is formed：Each superframe is divided between net multi-frame in multi-frame and net, between net multi-frame be divided into again duties frame between net, Dynamic subframe between subframe and net is fixed between net, multi-frame is divided into duties frame in net, dynamic in subframe and net is fixed in net again in net Frame；Fixed subframe is made of multiple fixed time slots, and dynamic subframe is made of multiple dynamic slots；
(2a), which is based on fixing between time slot division and net in number of links division time slot, including net, fixes time slot division；
(2b) duties frame is used for earth station and injects information and the new neighbors of node progress blind sweep discovery to node；Fixed subframe is used for General communication and communicate on demand, i.e., be on the one hand used for node interaction topology information, on the other hand, when node has the biography of traffic packets During defeated demand, packet transmission is realized by preengaging dynamic slot resource to destination node；Dynamic subframe is mainly used for communicating on demand The middle successful service communication of reservation, carries out dynamic service packet transmission between node；Mutually tied with dynamically distributes using fixed allocation The slot allocation method of conjunction；
(2c) is when there is new node networking, if the fixation slotted communication of atom net can not be multiplexed, dynamic slot is changed into new and is consolidated Timing gap uses；
Step 3, service quality guarantee：When the resource in network can not meet multiservice requirement, robbed using high-priority service The method for accounting for low priority traffice resource, ensures the priority communication of high-priority service.
4. the multi-frequency time division multiple access cut-in method according to claim 3 based on directional aerial, it is characterised in that：Step Time slot is divided based on number of links described in (2a), is included the following steps：
Time slot division is fixed in (2a1) net：In n node subnet of configuration directional aerial, co-exist inBar link, if n is Even number, each time slot at most fix time slot to node communication for n/2, it is necessary to divide in (n-1) a net；If n is odd number, each Time slot at most communicates for (n-1)/2 pair node and fixes time slot, it is necessary to divide in n net；Wherein n is integer, n >=2；
Time slot division is fixed between (2a2) net：In configuration directional aerial has the network of x gateway node, between gateway node altogether In the presence ofBar link, if x is even number, each time slot at most communicates, it is necessary to divide (x-1) a net gateway node for x/2 Fixed time slot；If x is odd number, each time slot fixes time slot at most communicating for (x-1)/2 node, it is necessary to divide x net； Wherein x is integer, x >=2.
5. the multi-frequency time division multiple access cut-in method according to claim 3 based on directional aerial, it is characterised in that：Step Duties frame described in (2b) is used for earth station and injects information and the new neighbors of node progress blind sweep discovery to node；Fixed subframe is used Communicate in general communication and on demand, and dynamic subframe is used to preengage successful service communication in communicating on demand；Include as follows Step：
Information is injected by (2b1) duties Zheng Zhong earth stations and node carries out blind sweep：Subnet interior nodes during the arrival of duties frame, connect in net The topology information that earth station injects to subnet is received, and carries out blind sweep and finds new neighbors, to complete the operations such as new node networking；Net Artis is when duties frame arrives between net, topology information that satellite receiver inject to gateway node, and carries out blind sweep and find newly Neighbors, to complete the operations such as new node networking；
Geographical location information bag is sent in (2b2) fixed subframe：Subnet interior nodes fixed in the net of distribution time slot with it is corresponding Neighbor node interacts member's geographical location information in this subnet collected by oneself in net, writes in net in geographical location information bag Send, include each node ID number and corresponding longitude and latitude and height in net in net in geographical location information bag；Gateway node The geographical location information that time slot interacts this subnet with corresponding purpose gateway node is fixed between the net of distribution, write-in is geographical between netting Sent in positional information bag, include subnet number and this subnet longitude, latitude and height between net in geographical location information bag Bound；
Geographical location information table is updated in (2b3) fixed subframe：Destination node updates oneself ground after receiving geographical location information bag Manage in positional information table originally without the geographical location information of member or each subnet in the net grasped；
Dynamic slot reservation bag is sent in (2b4) fixed subframe：If source node has traffic packets to need the node to present communications It is transmitted, then a dynamic slot reservation bag is sent after geographical location information bag is transmitted, is preengage to destination node dynamic State time interval resource is transmitted with completing packet；Source node will not only identify source and destination node address in reservation bag, it is also necessary to indicate Oneself need the priority for number of timeslots and oneself the current idle dynamic slot number, the finally upper traffic packets of mark preengage In order to subsequently realize high priority security mechanism；If destination node in this subnet, source node fixed in net time slot to Dynamic slot in destination node reservation net；If destination node, not in this subnet, node fixes time slot to this subnet in net Gateway node reservation net in dynamic slot, first business is transmitted at the gateway node of this subnet, gateway node then can be in net Between fix gateway node from time slot to purpose subnet reservation net between dynamic slot, to carry out the sound cross network transmission of book network service；
Destination node carries out response to the reservation information of source node in (2b5) fixed subframe：Destination node receives source node transmission Dynamic slot reservation bag after, check the dynamic slot occupancy table of oneself, according to oneself current free timeslot situation to source save The reservation of point carries out response, and source and destination node address are included in response bag, whether agrees to reserving time slots and the timeslot number of distribution, Local dynamic slot is correspondingly changed at the same time takes table；
It is prepared in (2b6) fixed subframe according to response message：Source node receives the dynamic slot reservation response of destination node Bao Hou, updates the dynamic slot occupancy table of oneself, prepares the transmission of follow-up business packet according to response message, so far reservation process Complete；
Business is sent in (2b7) dynamic subframe：When the dynamic slot that both sides consult arrives, source node sends traffic packets, Destination node replys an ACK confirmation message to source node after each time slot harvests packet and represents that oneself has been successfully received industry Business packet, so far a service communication process completion；
The transmission of (2b8) business continuing judges：A communication process is caused not transfer if the portfolio of node is excessive, it is next When the fixation time slot that frame communicates with destination node arrives, return to step (2b4) transmits data to destination node reserving time slots again Bag, performs step (2b4) to step (2b7), until the business whole end of transmission of the node.
6. the multi-frequency time division multiple access cut-in method according to claim 5 based on directional aerial, it is characterised in that：Step Destination node carries out response to the reservation information of source node in fixation subframe described in (2b5), is divided into 4 kinds of situations：
The reservation that (2b5.1) the destination node free timeslot number quantity consistent with source node free timeslot number is more than source node needs Ask, then x time slot is randomly choosed in source node free timeslot number, response message is sent back to, wherein x preengages for source node The quantity of dynamic slot；
The reservation that (2b5.2) the destination node free timeslot number quantity consistent with source node free timeslot number is equal to source node needs Ask, then select this consistent x time slot of number, response message is sent back to, wherein x is the number that source node preengages dynamic slot Amount；
The reservation that (2b5.3) the destination node free timeslot number quantity consistent with source node free timeslot number is less than source node needs Ask, then select y consistent time slot of number, response message is sent back to, wherein y is the consistent quantity of free timeslot number, and x is Source node preengages the quantity of dynamic slot, y ≠ 0 and y ＜ x；
(2b5.4) the destination node free timeslot number quantity consistent with source node free timeslot number is 0, then different in response message The reserve requests of meaning source node.
7. the multi-frequency time division multiple access cut-in method according to claim 3 based on directional aerial, it is characterised in that step 3 The method that low priority traffice resource is seized using high-priority service, ensures the priority communication of high-priority service, Including having the following steps：
(3a) if source node after corresponding fixed time slot consults the dynamic slot of subsequent transmission business with destination node, Another node also has traffic packets to need to be sent to the destination node, is divided into 2 kinds of situations at this time：
(3a1) situation 1, the rear priority to reservation bag are less than or equal to the priority for arriving first reservation bag, then destination node performs Step (2b5.1)~(2b5.4) carries out response in remaining free timeslot to later reservation message；
(3a2) situation 2, the rear priority to reservation bag are more than the priority for arriving first reservation bag, perform following steps：
Original planned assignment is allocated to the section of high priority by (3a2.1) destination node to the dynamic slot of low priority reservation bag Point；
(3a2.2) confiscates destination node reply when lower-priority data bag sends business in the dynamic slot consulted ACK confirmation messages, then it is assumed that traffic packets are not sent to destination node successfully, step (2b4)~(2b8) are performed, next time Again to destination node reserving time slots transmission packet when fixed time slot arrives, until the business whole Successful transmissions of the node.
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