CN109510658A - Applied to group network access method, system and the platform under more floating platform scenes - Google Patents
Applied to group network access method, system and the platform under more floating platform scenes Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000007480 spreading Effects 0.000 claims abstract description 32
- 230000001360 synchronised effect Effects 0.000 claims abstract description 32
- 230000006855 networking Effects 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 16
- 230000004044 response Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 description 8
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- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18504—Aircraft used as relay or high altitude atmospheric platform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0022—PN, e.g. Kronecker
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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Abstract
The invention discloses a kind of group network access method, system and platforms applied under more floating platform scenes, this method comprises the following steps: one group of orthogonal PN spreading code of selection, it includes the first link spreading code and the second link spreading code, the first link between each floating platform is established by the first link spreading code, the second link between floating platform and corresponding user is established by the second link spreading code；From all floating platforms, platform centered on selecting one, remaining is as assistance platform；The assistance platform initiates time synchronization application, and deadline synchronizing process to central platform；The user initiates the synchronous application that networks to corresponding floating platform, and completes to synchronize into network process.Relative to single floating platform, the present invention is the networking by point and face, and realizes the purpose of floating platform quickly networking, high-speed traffic.
Description
Technical field
The present invention relates to floating platform relay communication system regions, and in particular to one kind is applied under more floating platform scenes
Group network access method, system and floating platform.
Background technique
Increase with global various fields to relaying traffic demands, especially the military information field of military operations, this
Just to the ability of relay communications system fast assembling, more stringent requirements are proposed.Kusatellite relay system capacity is limited at present, is delayed
It is larger, signal is weak, vulnerable to interference, and also more and more to the research of floating platform in recent years, more floating platform networkings are realized logical
Letter relaying is a kind of mode of reliable, large capacity, low cost, low time delay multimedia communication, and emergency capability is strong, copes with
Emergency event.Quickly, the ad hoc network under floating platform is efficiently constructed, realizes being in communication with each other between floating platform, perception week
Environmental information is enclosed, and exchanges respective status information, is the necessity of future battlefield.
Local area communication network based on floating platform be for it is information-based fight to surveillance information information real-time Transmission and distribution,
The demands such as combat unit information realtime interactive and the integrated network constituted, can not only transmit video that each combat unit sends,
The information such as image, speech, remote control, telemetering to floating platform, floating platform can also be shared and be distributed to battle field information.It is mostly floating
Under hollow panel, realize that the quickly networking of floating platform is a kind of necessary technological means for coping with the variation of battlefield instant.
It is relayed based on test, especially in floating study of platform field, mainly single floating platform such as fire balloon at present
Research and experiment under military field application background rarely has.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide one kind to be applied to more floating platform scenes
Under group network access method, achieve the purpose that floating platform quickly networking, high-speed traffic.
To achieve the above objectives, the technical solution adopted by the present invention is that: a kind of group applied under more floating platform scenes
Network access method includes the following steps:
Select one group of orthogonal PN spreading code comprising the first link spreading code and the second link spreading code pass through the first chain
Road spreading code establishes the first link between each floating platform, establishes floating platform by the second link spreading code and uses with corresponding
The second link between family；
From all floating platforms, platform centered on selecting one, remaining is as assistance platform；
The assistance platform initiates time synchronization application, and deadline synchronizing process to central platform；
The user initiates the synchronous application that networks to corresponding floating platform, and completes to synchronize into network process.
Further, from all floating platforms, platform centered on selecting one, remaining is flat as auxiliary
Platform specifically comprises the following steps:
A1: in the first time window, the floating platform randomly chooses first back off time, in the first back off time
The first link between each floating platform is inside persistently monitored, A2 is transferred to；
A2: judge whether the first link between each floating platform is idle, if so, terminating in the first back off time
Afterwards, which holds after broadcast for completing competition frame in the second time window to floating platform broadcast contention frame described in other
Continuous the first link monitored between each floating platform, and it is transferred to A3；If it is not, being then transferred to A4；
A3: judge whether the first link between each floating platform is idle, if so, by centered on the floating platform
Platform；If it is not, being then transferred to A4；
A4: the floating platform receives the competition frame of other floating platform broadcast, and judges whether to receive successfully, if connecing
Harvest function is then persistently monitoring the first link between each floating platform, and is being transferred to A5 in third time window；If reception failure,
Then return to A1；
A5: judge whether the first link between each floating platform is idle, is connect if so, the floating platform will be broadcasted
Platform centered on the floating platform of the competition frame of receipts；If it is not, then returning to A4.
Further, the assistance platform initiates time synchronization application, and deadline synchronizing process, tool to central platform
Body includes the following steps:
B1: in the 4th time window, the assistance platform randomly chooses second back off time, in the second back off time
The first link between each floating platform is inside persistently monitored, and is transferred to B2；
B2: judging whether the first link between each floating platform is idle, if so, the assistance platform is to central platform
Time synchronization application is initiated, and is persistently monitoring the first link between each floating platform in the 5th time window, is transferred to B3；If should
Assistance platform receives the time synchronization application of other assistance platforms, then returns to B1；
B3: judging whether to receive the beacon frame of central platform reply, if receiving, time synchronization success, and if not receiving,
Return to B1.
Further, the structure of the beacon frame includes PN frame synchronization head, frame type, source node ID, destination node ID, hair
Timestamp, message segment, dead section and CRC check section are sent, the assistance platform reads sending time stamp, and the deadline is synchronous.
Further, the user initiates the synchronous application that networks to corresponding floating platform, and completes to synchronize into network process,
Specifically comprise the following steps:
C1: in the 6th time window, the user randomly chooses a third back off time, holds in third back off time
Continuous the second link monitored between floating platform and corresponding user, and it is transferred to C2；
C2: judging whether the second link between floating platform and corresponding user is idle, if so, the user is to phase
The floating platform answered issues synchronous networking request packet, and persistently monitor in the 7th time window floating platform and corresponding user it
Between the second link, be transferred to C3；If it is not, being then transferred to C5；
C3: judge whether to receive the response bag that corresponding floating platform is replied, if receiving, synchronization networks successfully；If not
It receives, is then transferred to C4；
C4: collision event is judged whether there is, if it exists collision event, is then transferred to C5；Collision event if it does not exist is then returned
Return C1；
C5: in the 8th time window, one the 4th back off time of random selection carries out keeping out of the way waiting the user, keeps out of the way waiting
After, return to C1.
Further, timer is created, in step C4, collision event if it does not exist, then in the timing cycle of timer,
C1 is returned, the synchronous application that networks is re-initiated, if the number for re-initiating the synchronous application that networks is more than setting number, accordingly
Floating platform is not unreachable in net or Radio Link.
Further, the collision event includes that the user receives the synchronization networking request packet of other users' sendings, is somebody's turn to do
The corresponding floating platform of user replies to one of the response bag of other users.
The present invention also provides a kind of networking access systems applied under more floating platform scenes comprising:
First module is used to select one group of orthogonal PN spreading code comprising the first link spreading code and the second link expand
Frequency code establishes the first link between each floating platform by the first link spreading code, is established by the second link spreading code floating
The second link between hollow panel and corresponding user；
Second module is used for from all floating platforms, and platform centered on selecting one, remaining is as auxiliary
Help platform；
Third module is used for the assistance platform to central platform and initiates time synchronization application, and the deadline is synchronous
Process；
4th module is used for the user to the synchronous application that networks of corresponding floating platform initiation, and completes same step into
Network process.
The present invention also provides a kind of floating platforms comprising:
Synchronization module, be used for other floating platforms issue time synchronization request, and with other floating platforms carry out when
Between it is synchronous；
Module is monitored, is used to randomly choose first back off time in the first time window, and move back described first
The first link monitored between each floating platform was kept away in the time；
Judgment module is used to judge whether the first link between each floating platform to be idle；
Sending module is used at the end of the first back off time, and the first link between each floating platform is idle
Under the premise of broadcast competition frame for competing central platform；Meanwhile
The monitoring module is also used to after broadcast contention frame, is persistently monitored between each floating platform in the second time window
The first link, whether first link of the judgment module judgement in the second time window between each floating platform idle,
If so, this floating platform is set as central platform.
Further, the floating platform also further includes receiving module, and the receiving module is used to judge in judgment module
After the first link in the second time window between each floating platform is busy, the competition frame from other floating platforms is received.
Compared with the prior art, the advantages of the present invention are as follows:
Relative to single floating platform, the present invention be by point and face networking, and realize floating platform quickly networking, quickly
The purpose of communication.
Detailed description of the invention
Fig. 1 is the group network access method flow chart provided in an embodiment of the present invention applied under more floating platform scenes；
Fig. 2 is more floating platform schematic diagram of a scenario provided in an embodiment of the present invention；
Fig. 3 is each floating platform competition central platform flow chart provided in an embodiment of the present invention；
Fig. 4 is competition frame structure schematic diagram provided in an embodiment of the present invention；
Fig. 5 carries out time synchronization flow chart to central platform for assistance platform provided in an embodiment of the present invention；
Fig. 6 is the two-way time synchronization schematic diagram of RTT provided in an embodiment of the present invention；
Fig. 7 synchronizes networking flow chart to floating platform for user provided in an embodiment of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
Shown in Figure 1, the embodiment of the invention provides a kind of networking access sides applied under more floating platform scenes
Method includes the following steps:
S1: one group of orthogonal PN spreading code of selection is to distinguish floating platform class and user class two-tier network comprising the first chain
Road spreading code and the second link spreading code are established the first link between each floating platform by the first link spreading code, are passed through
Second link spreading code establishes the second link between floating platform and corresponding user, and application scenarios shown in Figure 2 are false
If the maximum communication distance under the scene is 1000km, then maximum communication delay is 3.3ms, minimum time slot width X > >
3.3ms；
S2: each floating platform competition central platform: from all floating platforms, platform centered on selecting one,
It is remaining to be used as assistance platform；
It is shown in Figure 3, specifically comprise the following steps:
S20: after floating platform powers on, the floating platform is when width is the first of 1X~5X (X is minimum time slot width)
Between in window, randomly choose first back off time (such as 100ms, 100ms > > 3.3ms), held in the first back off time
Continuous the first link monitored between each floating platform, is transferred to S21；
S21: judge whether the first link between each floating platform is idle, if so, being transferred to S22；If it is not, being then transferred to
S24；
S22: after the first back off time, the floating platform is to other floating platform broadcast contention frames, in competition
Heart platform, the frame structure for competing frame includes PN frame synchronization head, frame type, source node ID, destination node ID, sending time stamp, letter
Cease section, dead section and CRC check section, total length 2kbit is shown in Figure 4；The floating platform completes the broadcast of competition frame
Afterwards, in the second time window that width is 2X (such as 50ms, 50ms > > 3.3ms) persistently monitor between each floating platform the
One link, and it is transferred to S23；
Whether idle S23: judging the first link between each floating platform, if so, determine the floating platform this
Competition frame broadcast successfully, be transferred to S28；If it is not, then determining this competition frame broadcast failure of the floating platform, it is transferred to S24；
S24: the floating platform is attempted to receive the competition frame of other floating platforms broadcast, and is transferred to S25；
S25: judging whether to receive successfully, if the floating platform has been properly received the competition frame of other floating platforms broadcast,
Then the floating platform is transferred to S26 after competing frame and receiving；If reception failure, the first chain between each floating platform is waited
After road restores idle, S20 is returned；
S26: the first link between each floating platform is persistently monitored in the third time window that width is 2X, and is transferred to
S27；
S27: judge whether the first link between each floating platform is idle, if so, being transferred to S29；If it is not, then returning
S24；
S28: by platform centered on the floating platform, remaining floating platform is as assistance platform；
S29: will broadcast the floating platform centered on the floating platform of received competition frame platform, remaining floating it is flat
Platform is as assistance platform.
For each floating platform after specifying central platform, each assistance platform carries out time unifying to central platform, right
Neat benchmark is the sending time stamp in the beacon frame that central platform is replied.
S3: floating platform networking is synchronous: assistance platform initiates time synchronization application to central platform, and the deadline is synchronous
Process；
It is shown in Figure 5, specifically comprise the following steps:
S30: assistance platform randomly chooses second back off time, in the second back off time in the 4th time window
The first link between each floating platform is persistently monitored, and is transferred to S31；
Whether idle S31: judging the first link between each floating platform, if so, thinking that the time can be initiated same
Step application, is transferred to S32；If the assistance platform receives the time synchronization application of other assistance platforms initiation in snoop procedure,
Then think that the first link between current each floating platform is busy, returns to S30；
S32: the assistance platform initiates time synchronization application to central platform, persistently monitors each floating in the 5th time window
The first link between platform, is transferred to S33；
S33: judge whether the assistance platform receives the beacon frame that central platform is replied and be transferred to S34 if receiving；If not
It receives, then returns to S30；
S34: time synchronization success.
Principle is as shown in Fig. 6, A, B point-to-point transmission clock deviation Δ AB, propagation delay dAB.Relationship is successively sent according to attached drawing 6, and
Send every time successively includes t in data packet1、t2、t3、t4Timestamp information has following relationship:
t2=t1+ΔAB+dAB (1)
t4=t3-ΔAB+dAB (2)
Δ AB and d can be acquired by formula (1) and (2)AB。
The structure of beacon frame includes PN frame synchronization head, frame type, source node ID, destination node ID, sending time stamp, information
Section, dead section and CRC check section, assistance platform reads sending time stamp, and the deadline is synchronous, the frame of beacon frame and competition frame
Type, filling content are not quite similar, and structure is identical.
S4: user saves to network to corresponding floating platform is synchronous: user initiates synchronous networking Shen to corresponding floating platform
Please, it and completes to synchronize into network process.
It is shown in Figure 7, specifically comprise the following steps:
S40: after user powers on, which randomly chooses a third back off time, moves back in third in the 6th time window
The second link persistently monitored between floating platform and corresponding user is kept away the time in (such as 50ms, 50ms > > 3.3ms), and
It is transferred to S41；
S41: judge whether the second link between floating platform and corresponding user is idle, if so, being transferred to S42；
If it is not, being then transferred to S45；
S42: the user issues synchronous networking request packet to corresponding floating platform, and the user is not aware that it is corresponding at this time
Floating platform whether in net, therefore, persistently monitored in the 7th time window (such as 5ms) floating platform and corresponding user it
Between the second link, and receive the response bag that corresponding floating platform is replied, be transferred to S43；
S43: judging whether the user receives the response bag that corresponding floating platform is replied in the 7th time window, if receiving
It arrives, is then transferred to S46；If not receiving, it is transferred to S44；
S44: judging whether there is collision event, and collision event includes same the stepping into that the user receives other users' sendings
Net request packet, the corresponding floating platform of the user reply to one of response bag of other users, if it exists collision event, then
It is transferred to S45；Collision event if it does not exist then returns to S40, re-initiates the synchronous application that networks；
S45: for the user in the 8th time window, one the 4th back off time of random selection keep out of the way waiting, such as the
The width of eight time windows is 600ms, which randomly chooses an integer value in 600ms and carry out keeping out of the way waiting, keeps out of the way waiting
After, S40 is returned, the synchronous application that networks is re-initiated；
S46: the user synchronizes to corresponding floating platform and networks successfully.
It further include creation timer in step S4, in step S44, collision event if it does not exist, then in the timing of timer
In period, S40 is returned, re-initiates the synchronous application that networks, the synchronous application that networks is re-initiated in the timing cycle of timer
When, the number that record re-initiates the synchronous application that networks is carried out by variable count, application is re-initiated every time, all to count
It carries out plus 1 operates, if the number for re-initiating synchronous networking application is more than to set number (such as 3 times) not receiving still accordingly
The response bag that floating platform is replied, then determine that corresponding floating platform is not unreachable in net or Radio Link.It re-initiates every time
When synchronous networking application, by the 8th time window, successively index increases, upper limit 30s.
Relative to single floating platform, the present invention is the networking by point and face, realizes floating platform quickly networking, quickly leads to
The purpose of letter.
The embodiment of the invention also provides a kind of networking access systems applied under more floating platform scenes comprising:
First module is used to select one group of orthogonal PN spreading code comprising the first link spreading code and the second link expand
Frequency code establishes the first link between each floating platform by the first link spreading code, is established by the second link spreading code floating
The second link between hollow panel and corresponding user；
Second module is used for from all floating platforms, platform centered on selecting one, remaining is flat as auxiliary
Platform；
Third module is used for assistance platform to central platform and initiates time synchronization application, and deadline synchronizing process；
4th module is used for user to corresponding floating platform and initiates the synchronous application that networks, and completes to synchronize and network
Journey.
The embodiment of the invention also provides a kind of floating platforms comprising:
Synchronization module, be used for other floating platforms issue time synchronization request, and with other floating platforms carry out when
Between it is synchronous；
Module is monitored, is used to randomly choose first back off time in the first time window, and when first keeps out of the way
Interior the first link monitored between each floating platform；
Judgment module is used to judge whether the first link between each floating platform to be idle；
Sending module is used at the end of the first back off time, and the first link between each floating platform is idle
Under the premise of broadcast competition frame for competing central platform；Meanwhile
It monitors module to be also used to after broadcast contention frame, persistently monitors the between each floating platform in the second time window
One link, judgment module judges whether the first link between each floating platform in the second time window is idle, if so, will
This floating platform is set as central platform.
Floating platform also further includes receiving module, and receiving module is used for each floating in the second time window in judgment module judgement
After the first link between hollow panel is busy, the competition frame from other floating platforms is received.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of group network access method applied under more floating platform scenes, which comprises the steps of:
Select one group of orthogonal PN spreading code comprising the first link spreading code and the second link spreading code are expanded by the first link
Frequency code establishes the first link between each floating platform, by the second link spreading code establish floating platform and corresponding user it
Between the second link；
From all floating platforms, platform centered on selecting one, remaining is as assistance platform；
The assistance platform initiates time synchronization application, and deadline synchronizing process to central platform；
The user initiates the synchronous application that networks to corresponding floating platform, and completes to synchronize into network process.
2. being applied to the group network access method under more floating platform scenes as described in claim 1, which is characterized in that from all
The floating platform in, select one centered on platform, remaining specifically comprises the following steps: as assistance platform
A1: in the first time window, the floating platform randomly chooses first back off time, holds in the first back off time
Continuous the first link monitored between each floating platform, is transferred to A2；
A2: judging whether the first link between each floating platform is idle, if so, after the first back off time, it should
Floating platform is persistently supervised after broadcast for completing competition frame in the second time window to floating platform broadcast contention frame described in other
The first link between each floating platform is listened, and is transferred to A3；If it is not, being then transferred to A4；
A3: judge whether the first link between each floating platform is idle, if so, by putting down centered on the floating platform
Platform；If it is not, being then transferred to A4；
A4: the floating platform receives the competition frame of other described floating platforms broadcast, and judges whether to receive successfully, if reception at
Function is then persistently monitoring the first link between each floating platform, and is being transferred to A5 in third time window；If reception failure is returned
Return A1；
A5: judging whether the first link between each floating platform is idle, if so, it is received to broadcast the floating platform institute
Platform centered on the floating platform of competition frame；If it is not, then returning to A4.
3. being applied to the group network access method under more floating platform scenes as described in claim 1, which is characterized in that described auxiliary
It helps platform to initiate time synchronization application, and deadline synchronizing process to central platform, specifically comprises the following steps:
B1: in the 4th time window, the assistance platform randomly chooses second back off time, holds in the second back off time
Continuous the first link monitored between each floating platform, and it is transferred to B2；
B2: judge whether the first link between each floating platform is idle, if so, the assistance platform is initiated to central platform
Time synchronization application, and the first link between each floating platform is persistently being monitored in the 5th time window, it is transferred to B3；If the auxiliary
Platform receives the time synchronization application of other assistance platforms, then returns to B1；
B3: judging whether to receive the beacon frame of central platform reply, if receiving, time synchronization success if not receiving, is returned
B1。
4. being applied to the group network access method under more floating platform scenes as claimed in claim 3, it is characterised in that: the letter
The structure for marking frame includes PN frame synchronization head, frame type, source node ID, destination node ID, sending time stamp, message segment, dead section
With CRC check section, the assistance platform reads sending time stamp, and the deadline is synchronous.
5. being applied to the group network access method under more floating platform scenes as described in claim 1, which is characterized in that the use
The synchronous application that networks is initiated to corresponding floating platform in family, and completes to synchronize into network process, specifically comprises the following steps:
C1: in the 6th time window, the user randomly chooses a third back off time, persistently supervises in third back off time
The second link between floating platform and corresponding user is listened, and is transferred to C2；
C2: judging whether the second link between floating platform and corresponding user is idle, if so, the user is to corresponding
Floating platform issues synchronous networking request packet, and persistently monitors between floating platform and corresponding user in the 7th time window
Second link, is transferred to C3；If it is not, being then transferred to C5；
C3: judge whether to receive the response bag that corresponding floating platform is replied, if receiving, synchronization networks successfully；If not receiving,
Then it is transferred to C4；
C4: collision event is judged whether there is, if it exists collision event, is then transferred to C5；Collision event if it does not exist then returns
C1；
C5: the user is in the 8th time window, and one the 4th back off time of random selection carries out keeping out of the way waiting, and keeping out of the way waiting terminates
Afterwards, C1 is returned.
6. being applied to the group network access method under more floating platform scenes as claimed in claim 5, it is characterised in that: creation is fixed
When device, in step C4, collision event returns to C1, re-initiates synchronous networking then in the timing cycle of timer if it does not exist
Application, if the number for re-initiating the synchronous application that networks is more than setting number, corresponding floating platform is not in net or radio chains
Road is unreachable.
7. being applied to the group network access method under more floating platform scenes as claimed in claim 5, it is characterised in that: the punching
Prominent event includes that the user receives the synchronization networking request packet of other users' sendings, the corresponding floating platform of the user replies to
One of the response bag of other users.
8. a kind of networking access system applied under more floating platform scenes, characterized in that it comprises:
First module is used to select one group of orthogonal PN spreading code comprising the first link spreading code and the second link spreading code,
The first link between each floating platform is established by the first link spreading code, floating platform is established by the second link spreading code
The second link between corresponding user；
Second module is used for from all floating platforms, platform centered on selecting one, remaining is flat as auxiliary
Platform；
Third module is used for the assistance platform to central platform and initiates time synchronization application, and deadline synchronizing process；
4th module is used for the user to corresponding floating platform and initiates the synchronous application that networks, and completes to synchronize and network
Journey.
9. a kind of floating platform, characterized in that it comprises:
Synchronization module is used to issue time synchronization request to other floating platforms, and same with other floating platforms progress time
Step；
Module is monitored, is used to randomly choose first back off time in the first time window, and when described first keeps out of the way
Interior the first link monitored between each floating platform；
Judgment module is used to judge whether the first link between each floating platform to be idle；
Sending module is used at the end of the first back off time, before the free time of the first link between each floating platform
Put the competition frame broadcasted for competing central platform；Meanwhile
The monitoring module is also used to after broadcast contention frame, persistently monitors between each floating platform in the second time window
One link, the judgment module judge whether the first link between each floating platform in the second time window is idle, if so,
This floating platform is then set as central platform.
10. floating platform as claimed in claim 9, which is characterized in that the floating platform also further includes receiving module, described
After the first link of the receiving module between judgment module judgement in the second time window each floating platform is busy, receives and
From the competition frame of other floating platforms.
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