CN107801209A - A kind of wireless self-networking communication means and node - Google Patents
A kind of wireless self-networking communication means and node Download PDFInfo
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- CN107801209A CN107801209A CN201610804973.XA CN201610804973A CN107801209A CN 107801209 A CN107801209 A CN 107801209A CN 201610804973 A CN201610804973 A CN 201610804973A CN 107801209 A CN107801209 A CN 107801209A
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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
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Abstract
The present invention, which provides a kind of wireless self-networking communication means and node, this method, may include：Node sends signal in current time slots to receiving node, wherein, the length of the protection interval is more than or equal to the round-trip delay of the wireless self-networking and the transmitting-receiving conversion time delay sum of the wireless self-networking interior joint.Frame switch expense in wireless self-networking can be reduced in the embodiment of the present invention.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of wireless self-networking communication means and node.
Background technology
Current wireless ad hoc network systems, without global positioning system (Global Positioning System, GPS)
Or during BEI-DOU position system, its synchronous method is the master-slave synchronisation method based on Frame switch mostly, to reach the transmission of the whole network
It is synchronous, that is, solve to cause the overlapping and collision problem received and dispatched between node, to meet the transmission demand of wireless self-networking.Wherein, base
Synchronization node is mainly asked to initiate clock sync-request frame in the master-slave synchronisation method of Frame switch, time service node, which receives, backward please
Synchronization node is asked to send the clock acknowledgement frame after adding timestamp；After request synchronization node reception clock is obtained by simple calculations
Difference is simultaneously calibrated to local clock accordingly, to realize synchronization.Such a synchronous method based on Frame switch needs largely please
Ask, acknowledgement frame is used for synchronous, the scene especially more than the nodes, the expense for synchronization is even more that can not be ignored.It can be seen that current nothing
The problem of Frame switch expense is big in line MANET be present.
The content of the invention
It is an object of the invention to provide a kind of wireless self-networking communication means and node, to solve to deposit in wireless self-networking
Frame switch expense is big the problem of.
In order to achieve the above object, the embodiment of the present invention provides a kind of wireless self-networking communication means, including：
Node sends signal in current time slots to receiving node, wherein, the current time slots and the current time slots
Protection interval between adjacent time-slots be present, the length of the protection interval be more than or equal to the wireless self-networking it is round when
Prolong and change time delay sum with the transmitting-receiving of the wireless self-networking interior joint.
Optionally, the length of the protection interval is more than or equal to default time delay, and the default time delay is described wireless
It is maximum in the transmitting-receiving conversion time delay of the round-trip delay of MANET and the wireless self-networking interior joint and the wireless self-networking
Delay spread sum；Or
The current time slots include cyclic prefix, and the length of the cyclic prefix is more than or equal to the wireless self-networking
Middle maximum delay extension, the length of the protection interval are more than or equal to the round-trip delay of the wireless self-networking and the nothing
The transmitting-receiving conversion time delay sum of line MANET interior joint.
Optionally, the protection interval is located at the beginnings of the current time slots and either ended up or the protection interval position
In the centre of the current time slots and the adjacent time-slots.
Optionally, the node sends to have in the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal；Or
The node sends to have in the frame belonging to the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal.
Optionally, methods described also includes：
The node selects the earliest node of timing as reference mode in neighbor node, and will receive the reference
Initial time of the time slot initial time of the transmission signal of node as itself sending time slots.
Optionally, the node selects the earliest node of timing as reference mode in neighbor node, including：
The node receives the broadcast message that neighbor node is sent, and the broadcast message that each neighbor node is sent includes same
Information is walked, the synchronizing information for receiving node receive synchronously, to determine the time slot initial time of reception signal；
The synchronizing information that the node is sent by each neighbor node receive synchronously, is selected according to synchronized result
The earliest node of timing is selected as reference mode.
Optionally, the node of highest synchronization level only has one, or the wireless self-networking in the wireless self-networking
The node of middle highest synchronization level has multiple nodes, wherein, the multiple node sends synchronous.
Optionally, methods described also includes：
The node receives the signal that the receiving node is sent in another time slot, wherein, when the time slot is adjacent thereto
Protection interval between gap be present, the length of the protection interval is more than or equal to the round-trip delay of the wireless self-networking and described
The transmitting-receiving conversion time delay sum of wireless self-networking interior joint.
The embodiment of the present invention also provides a kind of wireless self-organizing network nodes, including：
Sending module, for sending signal to receiving node in current time slots, wherein, the current time slots are worked as with described
Protection interval between the adjacent time-slots of preceding time slot be present, the length of the protection interval is more than or equal to the wireless self-networking
Round-trip delay and the wireless self-networking interior joint transmitting-receiving conversion time delay sum.
Optionally, the length of the protection interval is more than or equal to default time delay, and the default time delay is described wireless
It is maximum in the transmitting-receiving conversion time delay of the round-trip delay of MANET and the wireless self-networking interior joint and the wireless self-networking
Delay spread sum；Or
The current time slots include cyclic prefix, and the length of the cyclic prefix is more than or equal to the wireless self-networking
Middle maximum delay extension, the length of the protection interval are more than or equal to the round-trip delay of the wireless self-networking and the nothing
The transmitting-receiving conversion time delay sum of line MANET interior joint.
Optionally, the protection interval is located at the beginnings of the current time slots and either ended up or the protection interval position
In the centre of the current time slots and the adjacent time-slots.
Optionally, the node sends to have in the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal；Or
The node sends to have in the frame belonging to the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal.
Optionally, the node also includes：
Selecting module, the node earliest for the selection timing in neighbor node will receive institute as reference mode
State initial time of the time slot initial time of the transmission signal of reference mode as itself sending time slots.
Optionally, the selecting module includes：
Receiving unit, for receiving the broadcast message of neighbor node transmission, the broadcast message that each neighbor node is sent is equal
Including synchronizing information, the synchronizing information for receiving node receive it is synchronous, during determining the starting of the time slot of reception signal
Carve；
Selecting unit, the synchronizing information for being sent by each neighbor node receive synchronously, according to synchronization
As a result the earliest node of selection timing is as reference mode.
Optionally, the node of highest synchronization level only has one, or the wireless self-networking in the wireless self-networking
The node of middle highest synchronization level has multiple nodes, wherein, the multiple node sends synchronous.
Optionally, the node also includes：
Receiving module, the signal sent for receiving the receiving node in another time slot, wherein, the time slot and its phase
Protection interval be present between adjacent time slot, the length of the protection interval be more than or equal to the wireless self-networking round-trip delay and
The transmitting-receiving conversion time delay sum of the wireless self-networking interior joint.
The above-mentioned technical proposal of the present invention at least has the advantages that：
The embodiment of the present invention, node send signal in current time slots to receiving node, wherein, the current time slots and institute
State between the adjacent time-slots of current time slots and protection interval be present, the length of the protection interval be more than or equal to it is described it is wireless from
The transmitting-receiving conversion time delay sum of the round-trip delay of networking and the wireless self-networking interior joint.So pass through the protection interval of time slot
Can avoids the overlapping and collision problem received and dispatched between node, without being avoided as prior art by Frame switch
The overlapping and collision problem received and dispatched between node, to reduce Frame switch expense in wireless self-networking.
Brief description of the drawings
Fig. 1 provides a kind of schematic flow sheet of wireless self-networking communication means for the embodiment of the present invention；
Fig. 2 is a kind of slot transmission schematic diagram provided in an embodiment of the present invention；
Fig. 3 is another slot transmission schematic diagram provided in an embodiment of the present invention；
Fig. 4 is another slot transmission schematic diagram provided in an embodiment of the present invention；
Fig. 5 is a kind of superframe structure schematic diagram provided in an embodiment of the present invention；
Fig. 6 is a kind of structure of time slot schematic diagram provided in an embodiment of the present invention；
Fig. 7 is a kind of symbolic construction schematic diagram provided in an embodiment of the present invention；
Fig. 8 is another superframe structure schematic diagram provided in an embodiment of the present invention；
Fig. 9 is another structure of time slot schematic diagram provided in an embodiment of the present invention；
Figure 10 is another slot transmission schematic diagram provided in an embodiment of the present invention；
Figure 11 is a kind of structural representation of wireless self-organizing network nodes provided in an embodiment of the present invention；
Figure 12 is the structural representation of another wireless self-organizing network nodes provided in an embodiment of the present invention；
Figure 13 is the structural representation of another wireless self-organizing network nodes provided in an embodiment of the present invention；
Figure 14 is the structural representation of another wireless self-organizing network nodes provided in an embodiment of the present invention；
Figure 15 is the structural representation of another wireless self-organizing network nodes provided in an embodiment of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
The embodiment of the present invention can apply to wireless self-networking, wherein, mobile Ad hoc network is made up of node, be it is a kind of from
Control, and multihop network, whole network can not utilize without the infrastructure of fixation or not convenient use existing network base
In the case of Infrastructure (such as base station, access point (Access Point, AP)), there is provided being in communication with each other between node.And in nothing
In line MANET, because the transmission power and wireless coverage of node are limited, if therefore distant two nodes will
Carry out communication can be forwarded the packet by means of other nodes, a kind of wireless multi-hop network is constituted between such node.
Mobile node in mobile Ad hoc network has route and packet forwarding, and arbitrary network can be made up of wireless connection
Topology.Mobile Ad hoc network can both be used as single network to work independently, and can also be accessed in the form of the subnet of end existing
Network, such as Internet network and Cellular Networks.In addition, the node described in the embodiment of the present invention can be appointed in wireless self-networking
One node, and its particular type is not limited.
Fig. 1 is referred to, the embodiment of the present invention provides a kind of wireless self-networking communication means, as shown in figure 1, including following step
Suddenly：
101st, node in current time slots to receiving node send signal, wherein, the current time slots with it is described current when
Protection interval (Guard Period, GP) between the adjacent time-slots of gap be present, the length of the protection interval is more than or equal to
The transmitting-receiving conversion time delay sum of the round-trip delay of the wireless self-networking and the wireless self-networking interior joint.
Wherein, above-mentioned current time slots can be any time slot in wireless self-networking, above-mentioned adjacent time-slots can be with it is upper
State the adjacent the latter time slot of current time slots, or the previous time slot adjacent with above-mentioned current time slots.Such as：When above-mentioned current
Gap is the 0th time slot in certain frame, then above-mentioned adjacent time-slots are then the 1st time slot, or above-mentioned current time slots are the 1st in certain frame
Individual time slot, then above-mentioned adjacent time-slots are then the 0th or the 2nd time slot.
In addition, above-mentioned node can be any node in wireless self-networking, above-mentioned time slot can be appointed in wireless self-networking
One time slot.So realized by above-mentioned steps can and above-mentioned GP is included between former and later two any time slots, and any GP
Length is more than or equal to the round-trip delay of the wireless self-networking and the transmitting-receiving conversion time delay of the wireless self-networking interior joint
Sum.
Wherein, the round-trip delay of above-mentioned wireless self-networking can be in wireless self-networking corresponding to single-hop largest coverage distance
Round-trip delay can be either the maximum round trip time delay of wireless self-networking or can be that model is nominally covered in wireless self-networking
The round-trip delay enclosed, it can be pre-configured, either set during planned network or can be set according to network transmission demand
Put, this embodiment of the present invention is not construed as limiting.
The embodiment of the present invention can be realized by being above-mentioned GP between two time slots, avoid receiving between node so as to realize
The overlapping and collision problem of hair, to reduce Frame switch expense in wireless self-networking.Special Frame switch operation need not be carried out, and
By carrying out particular design to frame structure or structure of time slot and meeting some other limitations, so as to cause to receive and dispatch between node
Overlapping and conflict, meet the transmission demand of MANET.
Optionally, the length of protection interval described above is more than or equal to default time delay, and the default time delay is described
In the transmitting-receiving conversion time delay of the round-trip delay of wireless self-networking and the wireless self-networking interior joint and the wireless self-networking
Maximum delay extends sum.
In the embodiment, the maximum delay extension of above-mentioned wireless self-networking can allow in above-mentioned wireless self-networking
Maximum delay extends, such as：Maximum multipath delay spread.It can be realized in the embodiment by above-mentioned GP length and avoid node
Between the overlapping and collision problem received and dispatched.Such as：As shown in Fig. 2 neighbor node, A transmission timing surpass each other by node A and node B
It is preceding in B, propagation delay (slot) between the two is τ1.By the principle of each node selection timing reference node can be institute
There is the node that the timing in neighbor node most shifts to an earlier date (earliest), then timing difference τ between the twod1≤τ1, that is, τd1It is maximum
For τ1, wherein, B can at least select A as timing reference node, now τd1=τ1.As shown in Fig. 2 node A is according to shown in black
Time slot be transmitted, the time slot that node B is indicated according to grey is sent, and dash area is the transmitting-receiving overlap in node A in figure
Point, its time span is τd1+τ1≤2τ1；If it is considered that the communication in MANET between the node of the hop distance of any two one, then 2 τ1
≤ RTT, wherein RTT are the round-trip delay of wireless self-networking, such as：Come and gone corresponding to self-organizing network system single-hop largest coverage distance
Time delay.Such as：Maximum multipath delay spread is τ in wireless ad hoc network systemsmax, the transmitting-receiving of node changes time delay as τRT, then each
The GP length T of time slotGPFollowing condition should be met：
TGP≥τd1+τ1+τmax+τRT≥RTT+τmax+τRT
Transmitting-receiving is accomplished without aliasing and interference in node A by above-mentioned GP length can, in Fig. 2, in node A
Reception to time slot n in time slot n+1 transmission with overlapping mutually, as shown in node A dash area, in order to realize transmitting-receiving without aliasing
Dash area is then needed to fall into the range of time slot n GP；In node B, dash area overlaps for the transmitting-receiving in node B, its time
Shown in length equation below：
That is the transmitting-receiving of B overlaps the time span for the dash area being less than in node A, and maximum delay expands in consideration system
τmax, the transmitting-receiving of node changes time delay as τRT, choose TGP≥RTT+τmax+τRT, then being sent and received in node B will not more deposit
In aliasing and interference.It should be noted that in order to simple, τmaxAnd τRTDo not marked in figure.
By being described above meeting condition TGP≥RTT+τmax+τRTWhen, the arbitrarily each other node A of neighbor node and
Communication between B will not occur to receive and dispatch the condition of aliasing and interference.
Optionally, the current time slots include cyclic prefix, and the length of the cyclic prefix is more than or equal to the nothing
Maximum delay extends in line MANET, and the length of the protection interval is more than or equal to the round-trip delay of the wireless self-networking
Time delay sum is changed in transmitting-receiving with the wireless self-networking interior joint.
In the embodiment, the length of above-mentioned protection interval be more than or equal to the wireless self-networking round-trip delay and
The transmitting-receiving conversion time delay sum of the wireless self-networking interior joint, can so realize and be initially added into some systems in time slot
Guard time covers τmaxInfluence, such as use orthogonal frequency division multiplexi (Orthogonal Frequency
Division Multiplexing, OFDM) modulation system in each symbol add cyclic prefix (Cyclic Prefix,
CP), CP length can be with TCPMeet TCP≥τmax, the now GP length T of each time slotGPT should be metGP≥RTT+τRT, and
Without covering τmaxPart, such a situation has been divided into two parts equivalent to by the protection interval between time slot, and a part is time slot
Between GP, for example, current time slots (previous time slot) ending or switch GP, another part be adjacent time-slots (latter time slot)
CP.
In addition, the length of above-mentioned cyclic prefix may be greater than or equal to maximum multipath time delay in the wireless self-networking
Extension.
That is TCPMeet TCP≥τmax。
Only it is to be illustrated with two nodes, to illustrate any two it should be noted that being illustrated for the explanation of GP length
Communication between node will not occur to receive and dispatch the condition of aliasing and interference.In addition it is also necessary to consider meeting above-mentioned TGP≥RTT+
τmax+τRTWhen, aliasing and interference whether reception signal will not occurring during receptions of any node A its any neighbors B, C.
As shown in figure 3, any node A needs successively to receive its arbitrary node C, B time slot signal, such as, time slot n-1 receiving nodes C
Signal, time slot n receiving nodes B signal, time slot n+1 need receiving node C signal again.Assuming that node A timing is advanced
In B, advanced argument τd1, C timing is ahead of A, advanced argument τd2；Propagation delay between node A and node B is τ1, node A
Propagation delay between node C is τ2It should be noted that for the sake of simplicity, τmaxAnd τRTDo not marked in figure.
By the above explanation to Fig. 2, there must be τd1≤τ1、τd2≤τ2；It is explained in detail in prior figures and meets T in GPGP≥
RTT+τmax+τRTWhen, aliasing will not be produced in the transmitting-receiving of any node, that is, T1 at least falls in node at the time of in Fig. 3
In the GP for the time slot n-1 signals that the node C that A is received is sent, and moment T3 at least falls the node B received in node A and sent
Time slot n signals GP in.
It need to only prove initial time T2 >=T1, namely T2 of receptions of the node A in the time slot n to node B in T1 below
Afterwards, then T2 is also to fall in the GP of time slot n-1 signals certainly, or after the GP of time slot n-1 signals, that is to say node A to elder generation
The reception to node C, B will not produce overlapping and interference afterwards；Equally, node A connecing in the time slot n+1 to node C need to only be proved
After t 3, then T4 is affirmed and fallen in the GP of time slot n signals or time slot n believes by initial time T4 >=T3 of receipts, namely T4
Number GP after, that is to say that node A will not produce overlapping and interference to reception of the priority to node B, C.
And due to T1=T+ τd2+Ts, T2=T+ τd1+τd2+Ts+τ1, T2-T1=τd1+τ1>=0, T2 >=T1 must be demonstrate,proved.
Due to T3=T+2Ts+τd2, T4=T+2Ts+τ2, T4-T3=τ2-τd2>=0, T4 >=T3 must be demonstrate,proved.
That is, meeting foregoing TGP≥RTT+τmax+τRTWhen, arbitrarily each other between the node A and B of neighbor node
Communication will not occur receive and dispatch aliasing and interference, receptions of any node A to its any neighbor node will not also produce aliasing and
Interference.
Optionally, above-mentioned protection interval is located at the beginnings of the current time slots and either ended up or the protection interval position
In the centre of the current time slots and the adjacent time-slots.
In the embodiment, it is possible to achieve exist between above-mentioned two time slot ending that GP can be above-mentioned current time slots or
Person's beginning is GP, can thus realize between two time slots GP be present.Wherein, when above-mentioned ending or beginning can be above-mentioned
It is GP part in gap.In addition, above-mentioned protection interval is located at the current time slots and the centre of the adjacent time-slots to be, on
The middle special time slot that protection interval can be the current time slots and the adjacent time-slots is stated, i.e., when the special time slot is current
Protection interval between gap and above-mentioned adjacent time-slots.
Optionally, above-mentioned node sends to have in the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal；Or
The node sends to have in the frame belonging to the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal.
It is above-mentioned receive synchronously for the receiving node in the embodiment, to determine that the time slot of reception signal rises
The synchronizing information at moment beginning can be a number of Given information, such as：Targeting signal (Preamble).I.e. node is in time slot
When sending signal, a number of Given information can be sent in this timeslot, to allow receiving node to enter according to these Given informations
Row is received synchronously, to determine the time slot initial time of reception signal.
In addition, above-mentioned synchronizing information can also be first time slot or the 0th time slot in the frame belonging to above-mentioned time slot
It is interior to send above-mentioned synchronizing information, it is of course also possible to be to have sent above-mentioned synchronizing information in each time slot, to allow receiving node root
According to these Given informations receive synchronously, to determine the time slot initial time of reception signal.Pass through time slot or frame to realize
Structure possess certain feature, it is synchronous receiving node to complete to receive.
Optionally, the above method also includes：
The node selects the earliest node of timing as reference mode in neighbor node, and will receive the reference
Initial time of the time slot initial time of the transmission signal of node as itself sending time slots.
In the embodiment, it is possible to achieve the earliest node of timing is as above-mentioned reference in above-mentioned node selection neighbor node
Node, initial time of the time slot initial time for sending signal as itself sending time slots of the reference mode will be received.
Such as：Shown in Fig. 4, it is assumed that node A is the node that timing is earliest determined by the time of one superframe of Node-B receiver, and is determined
It is the timing reference node of oneself.Assuming that A delivery time is T, both propagation delays are τ1, then B is synchronous by receiving
It is determined that the node A received time slot n-1 initial time is T+ τ1, then it is T+ τ at the time of B progress time slot transmission1,T+τ1+
Ts,T+τ1+2Ts..., wherein TsFor the time span of a time slot.
In addition, the earliest node of above-mentioned timing can be the signal sent in above-mentioned neighbor node in a superframe at first by
The node that above-mentioned node receives.Such as：Above-mentioned node is in 4 neighbor nodes, neighbor node 1 to 4, wherein, above-mentioned node exists
The signal that neighbor node 1, neighbor node 2, neighbor node 3 and neighbor node 4 are sent successively is received in one superframe, then, just
Can be using neighbor node 1 as reference mode.
Optionally, above-mentioned node selects the earliest node of timing as reference mode in neighbor node, including：
The node receives the broadcast message that neighbor node is sent, and the broadcast message that each neighbor node is sent includes same
Information is walked, the synchronizing information for receiving node receive synchronously, to determine the time slot initial time of reception signal；
The synchronizing information that the node is sent by each neighbor node receive synchronously, is selected according to synchronized result
The earliest node of timing is selected as reference mode.
Optionally, in the embodiment, above-mentioned synchronizing information can be targeting signal, certainly, right in the embodiment of the present invention
This is not construed as limiting, i.e., above-mentioned synchronizing information can also be the information that can be synchronized in addition to targeting signal.And the embodiment party
In formula, by taking targeting signal as an example, it is possible to achieve wireless self-networking interior nodes send and include leading broadcast message, to allow node to lead to
Cross the leading of each neighbor node transmission receive synchronously, according to the earliest node of synchronized result selection timing as reference node
Point.Such as：As shown in figure 5, the wireless ad hoc network systems are made up of several nodes, pass through superframe between node
(SuperFrame), frame (Frame) and time slot (Slot) carry out communication interaction.Each superframe is made up of 40 frames, and each frame is again
It is made up of 25 time slots, the time span of each time slot can be 1ms, superframe length 1000ms.When wherein per the 0th of frame
Gap is time slot, for sending the broadcast message of oneself between node in turn, including for receiving synchronous targeting signal
(preamble), so each superframe supports the broadcast message of maximum 40 nodes to send.
Wherein, structure of time slot can using as shown in fig. 6, the call duration time unit of the wireless ad hoc network systems node as time slot,
Each slot length can be 1ms, and each time slot can include 14 OFDM symbols.Wherein first symbol is automatic gain control
(Automatic Gain Control, AGC) symbol is made, for carrying out automatic growth control；Before second symbol is for known to
Signal (Preamble) is led, for carrying out receiving synchronization and offset estimation；Last symbol is GP, the interspersed two row pilot tones in centre
(pilot) for symbol to channel estimation and measurement, blank parts are data symbol, using OFDM modulation systems, each OFDM symbols
Number structure, as shown in fig. 7, wherein, slot samples speed is 30.72MHz, and the FFT points of OFDM modulation are the 2048, the 0th, 7
The length of the cyclic prefix CP of individual symbol is 160 sampling points, and the CP length of remaining symbol is 144 sampling points.The then MANET side
The maximum delay that method and device are supported expands to：
Assuming that transmitting-receiving conversion delay, τRT=20us,
By
Then the maximum single-hop coverage distance of the GP supports of 1 OFDM symbol length is shown in figure：
Wherein DmaxMaximum single-hop coverage distance is designed for the self-organizing network system, its corresponding maximum round trip time delay isC=3*10^8m/s is the light velocity.
The broadcast message that so each node is sent in each super frame period reception neighbor node in time slot, by wide
The targeting signal (preamble) for broadcasting information carries out reception synchronously, and the earliest node conduct of timing is therefrom chosen according to synchronizing information
The timing reference node of oneself, the time slot initial time of this node is synchronously determined with the reception to timing reference node.
As shown in prior figures 2 or 3, the system can meet to receive and dispatch nothing in single-hop coverage 7.7km in each node
Interference and aliasing, the reception to different nodes is noiseless and aliasing, meets the transmission demand of MANET.
In another example：As shown in figure 8, the self-organizing network system is made up of several nodes, pass through superframe, frame and time slot between node
Carry out communication interaction.Each superframe is made up of 40 frames, and each frame is made up of 25 time slots again, and the time span of each time slot is
1ms, superframe length 1000ms.The 0th time slot wherein per frame is time slot, for sending the wide of oneself between node in turn
Information is broadcast, including for receiving synchronous targeting signal preamble, so each superframe supports maximum 40 nodes
Broadcast message is sent.
As shown in figure 9, the call duration time unit of the self-organizing network system node is time slot, each slot length is structure of time slot
1ms, sampling rate 30.72MHz, before several modulation symbols be AGC symbols, for carrying out automatic growth control；Afterwards
Several symbols are known targeting signal (Preamble0, for carrying out receiving synchronization and offset estimation；Last 2192 skies
White sampled point is protection interval GP, and blank parts are data symbol, structure of the symbol without CP, and slot samples speed is
30.72MHz。
Assuming that the maximum delay for needing to support expands to τmax=4.6875us, transmitting-receiving conversion delay, τRT=20us.
By
Then the maximum single-hop coverage distance of the GP supports of 2192 sampled point length is shown in figure
Wherein DmaxMaximum single-hop coverage distance is designed for the self-organizing network system, its corresponding maximum round trip time delay isC=3*10^8m/s is the light velocity.
Each node receives the time slot information of neighbor node in each super frame period, passes through time slot
Preamble receive synchronously, therefrom chooses the earliest node of timing as the timing reference section of oneself according to synchronizing information
Point, the time slot initial time of this node is synchronously determined with the reception to timing reference node.
As shown in Figure 10, it is assumed that node A be the earliest node of timing determined by the time of one superframe of Node-B receiver,
And determine that it is the timing reference node of oneself.Assuming that A delivery time is T, both propagation delays are τ1, then B is by connecing
The initial time for receiving the time slot n-1 for the node A for synchronously determining to receive is T+ τ1, then it is T+ τ at the time of B progress time slot transmission1,T
+τ1+Ts,T+τ1+2Ts..., wherein TsFor the time span of a time slot.
As shown in prior figures 2 and 3, the system can meet to receive and dispatch nothing in single-hop coverage 7.0km in each node
Interference and aliasing, meet the transmission demand of MANET.
Optionally, the node of highest synchronization level only has one, or the wireless self-networking in above-mentioned wireless self-networking
The node of middle highest synchronization level has multiple nodes, wherein, the multiple node sends synchronous.
Wherein, the node of above-mentioned highest synchronization level can be the node synchronized by GPS or Big Dipper signal, such
Node is synchronization level highest node, in addition, these nodes can also be identified in time slot.If wireless self-networking
In there is no GPS or the Big Dipper then above-mentioned highest synchronization level node can be pre-configured with, or timing is earliest in the whole network
Node.
Optionally, the above method also includes：
The node receives the signal that the receiving node is sent in another time slot, wherein, when the time slot is adjacent thereto
Protection interval between gap be present, the length of the protection interval is more than or equal to the round-trip delay of the wireless self-networking and described
The transmitting-receiving conversion time delay sum of wireless self-networking interior joint.
In the embodiment, it is possible to achieve above-mentioned GP is equally existed between time slot corresponding to the signal that node receives, with
Realize between any two time slot above-mentioned GP all be present, to avoid the overlapping and conflict received and dispatched between node.
Using the self-organizing network system of the above method in the feelings for having GPS or the Big Dipper without GPS or the Big Dipper or only part of nodes
Under condition, the process that is synchronized without Frame switch, and only need to carry out particular design and satisfaction to frame structure or structure of time slot
Some other limitations, i.e., the overlapping and conflict received and dispatched between node will not be caused, meet the transmission demand of MANET.Relative to existing
Synchronous self-organizing network system, in the case where having GPS or the Big Dipper without GPS or the Big Dipper or only part of nodes, it can save and be used for
Synchronous Frame switch expense, it is big in network size, it is particularly considerable in the case that ether single-hop coverage distance is small.
It should be noted that in the embodiment of the present invention, the embodiment of the plurality of optional of above-mentioned introduction can be combined with each other
Realize, can also be implemented separately, this embodiment of the present invention is not construed as limiting.
The embodiment of the present invention, the embodiment of the present invention, node send signal in current time slots to receiving node, wherein, institute
State between the adjacent time-slots of current time slots and the current time slots and protection interval be present, the length of the protection interval be more than or
Time delay sum is changed in transmitting-receiving equal to the round-trip delay and the wireless self-networking interior joint of the wireless self-networking.So pass through
The protection interval can of time slot avoids the overlapping and collision problem received and dispatched between node, without leading to as prior art
Frame switch is crossed to avoid the overlapping and collision problem received and dispatched between node, to reduce Frame switch expense in wireless self-networking.
Referring to Figure 11, the embodiment of the present invention provides a kind of wireless self-organizing network nodes, and wireless self-organizing network nodes 1100 are included such as
Lower module：
Sending module 1101, for sending signal to receiving node in current time slots, wherein, the current time slots and institute
State between the adjacent time-slots of current time slots and protection interval be present, the length of the protection interval be more than or equal to it is described it is wireless from
The transmitting-receiving conversion time delay sum of the round-trip delay of networking and the wireless self-networking interior joint.
Optionally, the length of the protection interval is more than or equal to default time delay, and the default time delay is described wireless
It is maximum in the transmitting-receiving conversion time delay of the round-trip delay of MANET and the wireless self-networking interior joint and the wireless self-networking
Delay spread sum；Or
The current time slots include cyclic prefix, and the length of the cyclic prefix is more than or equal to the wireless self-networking
Middle maximum delay extension, the length of the protection interval are more than or equal to the round-trip delay of the wireless self-networking and the nothing
The transmitting-receiving conversion time delay sum of line MANET interior joint.
Optionally, the node sends to have in the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal；Or
The node sends to have in the frame belonging to the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal.
Optionally, node also includes as described in Figure 12：
Selecting module 1102, the node earliest for the selection timing in neighbor node will receive as reference mode
To initial time of the time slot initial time as itself sending time slots of the transmission signal of the reference mode.
Optionally, as shown in figure 13, the selecting module includes：
Receiving unit 11021, for receiving the broadcast message of neighbor node transmission, the broadcast that each neighbor node is sent is believed
Breath includes synchronizing information, and the synchronizing information receive synchronously for receiving node, to determine that the time slot of reception signal rises
Begin the moment；
Selecting unit 11022, the synchronizing information for being sent by each neighbor node carry out reception synchronously, according to
The earliest node of synchronized result selection timing is as reference mode.
Optionally, the node of highest synchronization level only has one, or the wireless self-networking in the wireless self-networking
The node of middle highest synchronization level has multiple nodes, wherein, the multiple node sends synchronous.
Optionally, as shown in figure 14, the node also includes：
Receiving module 1103, the signal sent for receiving the receiving node in another time slot, wherein, the time slot with
Protection interval be present between its adjacent time-slots, the length of the protection interval be more than or equal to the wireless self-networking it is round when
Prolong and change time delay sum with the transmitting-receiving of the wireless self-networking interior joint.
It should be noted that above-mentioned wireless self-organizing network nodes 1100 can be the implementation shown in Fig. 1-Figure 10 in the present embodiment
Node in example, any embodiment of Fig. 1-embodiment illustrated in fig. 10 interior joint can be by above-mentioned wireless in the present embodiment
Self-organizing network nodes 1100 are realized, and reach identical beneficial effect, and here is omitted.
Referring to Figure 15, the embodiment of the present invention provides another wireless self-organizing network nodes, and the node includes：Processor 1500,
Transceiver 1510, memory 1520, user interface 1530 and EBI, wherein：
Processor 1500, for reading the program in memory 1520, perform following process：
By transceiver 1510 in current time slots to receiving node send signal, wherein, the current time slots with it is described
Protection interval between the adjacent time-slots of current time slots be present, the length of the protection interval is more than or equal to described wirelessly from group
The transmitting-receiving conversion time delay sum of the round-trip delay of net and the wireless self-networking interior joint.
Wherein, transceiver 1510, for data to be received and sent under the control of processor 1500.
In fig.15, bus architecture can include the bus and bridge of any number of interconnection, specifically by the generation of processor 1500
The various circuits for the memory that the one or more processors and memory 1520 of table represent link together.Bus architecture may be used also
So that various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like to be linked together, these are all
It is known in the art, therefore, no longer it is described further herein.EBI provides interface.Transceiver 1510 can
To be multiple element, i.e., including transmitter and receiver, there is provided for the list to be communicated over a transmission medium with various other devices
Member.For different user equipmenies, user interface 1530, which be can also be, external the interface for needing equipment is inscribed, and connection is set
Standby including but not limited to keypad, display, loudspeaker, microphone, control stick etc..
Processor 1500 is responsible for bus architecture and common processing, and memory 1520 can store processor 1500 and exist
Used data when performing operation.
Optionally, the length of the protection interval is more than or equal to default time delay, and the default time delay is described wireless
It is maximum in the transmitting-receiving conversion time delay of the round-trip delay of MANET and the wireless self-networking interior joint and the wireless self-networking
Delay spread sum；Or
The current time slots include cyclic prefix, and the length of the cyclic prefix is more than or equal to the wireless self-networking
Middle maximum delay extension, the length of the protection interval are more than or equal to the round-trip delay of the wireless self-networking and the nothing
The transmitting-receiving conversion time delay sum of line MANET interior joint.
Optionally, the protection interval is located at the beginnings of the current time slots and either ended up or the protection interval position
In the centre of the current time slots and the adjacent time-slots.
Optionally, the node sends to have in the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal；Or
The node sends to have in the frame belonging to the current time slots carries out reception synchronously for the receiving node, with
Determine the synchronizing information of the time slot initial time of reception signal.
Optionally, processor 1500 is additionally operable to：
The earliest node of selection timing is as reference mode in neighbor node, and the hair that will receive the reference mode
Initial time of the time slot initial time for the number of delivering letters as itself sending time slots.
Optionally, it is described that the earliest node of timing is selected in neighbor node as reference mode, including：
The broadcast message of neighbor node transmission is received by transceiver 1510, the broadcast message that each neighbor node is sent is equal
Including synchronizing information, the synchronizing information for receiving node receive it is synchronous, during determining the starting of the time slot of reception signal
Carve；
The synchronizing information sent by each neighbor node receive synchronously, according to synchronized result selection timing most
Early node is as reference mode.
Optionally, the node of highest synchronization level only has one, or the wireless self-networking in the wireless self-networking
The node of middle highest synchronization level has multiple nodes, wherein, the multiple node sends synchronous.
Optionally, processor 1500 is additionally operable to：
Transceiver 1510 receives the signal that the receiving node is sent in another time slot, wherein, the time slot is adjacent thereto
Protection interval between time slot be present, the length of the protection interval is more than or equal to round-trip delay and the institute of the wireless self-networking
State the transmitting-receiving conversion time delay sum of wireless self-networking interior joint.
It should be noted that above-mentioned wireless self-organizing network nodes can be in the embodiment shown in Fig. 1-Figure 10 in the present embodiment
Node, any embodiment of Fig. 1-embodiment illustrated in fig. 10 interior joint can be by above-mentioned wirelessly from group in the present embodiment
Net node is realized, and reaches identical beneficial effect, and here is omitted.
In several embodiments provided herein, it should be understood that disclosed method and apparatus, can be by other
Mode realize.For example, device embodiment described above is only schematical, for example, the division of the unit, only
For a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can combine
Or another system is desirably integrated into, or some features can be ignored, or do not perform.Another, shown or discussed phase
Coupling or direct-coupling or communication connection between mutually can be by some interfaces, the INDIRECT COUPLING or communication of device or unit
Connection, can be electrical, mechanical or other forms.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That the independent physics of unit includes, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in one and computer-readable deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are causing a computer
Equipment (can be personal computer, server, or network equipment etc.) performs receiving/transmission method described in each embodiment of the present invention
Part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (Read-Only Memory, abbreviation
ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic disc or CD etc. are various to store
The medium of program code.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (16)
- A kind of 1. wireless self-networking communication means, it is characterised in that including：Node sends signal in current time slots to receiving node, wherein, the current time slots are adjacent with the current time slots Protection interval between time slot be present, the length of the protection interval be more than or equal to the wireless self-networking round-trip delay and The transmitting-receiving conversion time delay sum of the wireless self-networking interior joint.
- 2. the method as described in claim 1, it is characterised in that when the length of the protection interval is more than or equal to default Prolong, the default time delay changes time delay for the transmitting-receiving of the round-trip delay and the wireless self-networking interior joint of the wireless self-networking And maximum delay extends sum in the wireless self-networking；OrThe current time slots include cyclic prefix, and the length of the cyclic prefix is more than or equal in the wireless self-networking most Long time delay extends, the length of the protection interval be more than or equal to the wireless self-networking round-trip delay and it is described it is wireless from The transmitting-receiving conversion time delay sum of networking interior joint.
- 3. the method as described in claim 1, it is characterised in that the protection interval be located at the current time slots beginning or Ending, or the protection interval are located at the centre of the current time slots and the adjacent time-slots.
- 4. the method as described in claim 1, it is characterised in that the node is sent in the current time slots to be had for described Receiving node receive synchronously, to determine the synchronizing information of the time slot initial time of reception signal；OrThe node sends to have in the frame belonging to the current time slots and receive synchronously for the receiving node, to determine The synchronizing information of the time slot initial time of reception signal.
- 5. such as the method any one of claim 1-4, it is characterised in that methods described also includes：The node selects the earliest node of timing as reference mode in neighbor node, and will receive the reference mode Transmission signal initial time of the time slot initial time as itself sending time slots.
- 6. method as claimed in claim 5, it is characterised in that the node selects the earliest node of timing in neighbor node As reference mode, including：The node receives the broadcast message that neighbor node is sent, and the broadcast message that each neighbor node is sent includes synchronous letter Breath, the synchronizing information for receiving node receive synchronously, to determine the time slot initial time of reception signal；The synchronizing information that the node is sent by each neighbor node receive synchronously, and it is fixed to be selected according to synchronized result When earliest node as reference mode.
- 7. method as claimed in claim 5, it is characterised in that the node of highest synchronization level only has in the wireless self-networking The node of highest synchronization level has multiple nodes in one, or the wireless self-networking, wherein, the multiple node sends same Step.
- 8. such as the method any one of claim 1-4, it is characterised in that methods described also includes：The node receives the signal that the receiving node is sent in another time slot, wherein, time slot time slot adjacent thereto it Between protection interval be present, the length of the protection interval is more than or equal to the round-trip delay of the wireless self-networking and described wireless The transmitting-receiving conversion time delay sum of MANET interior joint.
- A kind of 9. wireless self-organizing network nodes, it is characterised in that including：Sending module, in current time slots to receiving node send signal, wherein, the current time slots with it is described current when Protection interval between the adjacent time-slots of gap be present, the length of the protection interval is more than or equal to the past of the wireless self-networking Return time delay and the transmitting-receiving conversion time delay sum of the wireless self-networking interior joint.
- 10. node as claimed in claim 9, it is characterised in that when the length of the protection interval is more than or equal to default Prolong, the default time delay changes time delay for the transmitting-receiving of the round-trip delay and the wireless self-networking interior joint of the wireless self-networking And maximum delay extends sum in the wireless self-networking；OrThe current time slots include cyclic prefix, and the length of the cyclic prefix is more than or equal in the wireless self-networking most Long time delay extends, the length of the protection interval be more than or equal to the wireless self-networking round-trip delay and it is described it is wireless from The transmitting-receiving conversion time delay sum of networking interior joint.
- 11. node as claimed in claim 9, it is characterised in that the protection interval be located at the current time slots beginning or Person ends up, or the protection interval is located at the centre of the current time slots and the adjacent time-slots.
- 12. node as claimed in claim 9, it is characterised in that the node is sent in the current time slots to be had for institute Receiving node is stated receive synchronously, to determine the synchronizing information of the time slot initial time of reception signal；OrThe node sends to have in the frame belonging to the current time slots and receive synchronously for the receiving node, to determine The synchronizing information of the time slot initial time of reception signal.
- 13. such as the node any one of claim 9-12, it is characterised in that the node also includes：Selecting module, the node earliest for the selection timing in neighbor node will receive the ginseng as reference mode Examine initial time of the time slot initial time of the transmission signal of node as itself sending time slots.
- 14. node as claimed in claim 13, it is characterised in that the selecting module includes：Receiving unit, for receiving the broadcast message of neighbor node transmission, the broadcast message that each neighbor node is sent includes Synchronizing information, the synchronizing information for receiving node receive synchronously, to determine the time slot initial time of reception signal；Selecting unit, the synchronizing information for being sent by each neighbor node receive synchronously, according to synchronized result The earliest node of selection timing is as reference mode.
- 15. node as claimed in claim 13, it is characterised in that the node of highest synchronization level in the wireless self-networking The node for having highest synchronization level in one, or the wireless self-networking has multiple nodes, wherein, the multiple node is sent It is synchronous.
- 16. such as the node any one of claim 9-12, it is characterised in that the node also includes：Receiving module, the signal sent for receiving the receiving node in another time slot, wherein, when the time slot is adjacent thereto Protection interval between gap be present, the length of the protection interval is more than or equal to the round-trip delay of the wireless self-networking and described The transmitting-receiving conversion time delay sum of wireless self-networking interior joint.
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