CN103596186A - Database-driven cognitive radio network in-band guide method - Google Patents
Database-driven cognitive radio network in-band guide method Download PDFInfo
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Abstract
The invention provides a database-driven cognitive radio network in-band guide method. When query information of a slave device to be connected with a cognitive radio network is forwarded to a frequency spectrum database, the query information is deleted through a multi-stage parent device of the slave device to be connected to obtain final query information, and the content of the final query information does not coincide with the content of a primary device or the content of all slave devices of the multi-stage parent device of the slave device to be connected. After the frequency spectrum database feeds back frequency spectrum information corresponding to the final query information, frequency spectrum information corresponding to the query information deleted before is added into the frequency spectrum information fed back by the frequency spectrum database layer by layer through the multi-stage parent device of the slave device to be connected, and the frequency spectrum information of the slave device to be connected with the cognitive radio network is obtained finally. According to the database-driven cognitive radio network in-band guide method, query content is reduced layer by layer when the query information is forwarded, the frequency spectrum information which is fed back is increased layer by layer in the forwarding process, as a result, data transmission content is reduced, few transmission channels are occupied, the transmission speed is increased, and guide time is short.
Description
Technical field
The invention belongs to cognitive radio networks field, relate in particular to the interior bootstrap technique of band of the cognitive radio networks of database-driven.
Background technology
The innovation that cognitive radio networks (cognitive radio network) is used to solve the problem that frequency spectrum service efficiency is low and accelerates wireless technology.In cognitive radio networks, first user (Primary user) is authorized user, has and can use preallocated channel; The second user (Secondary user) is unauthorized, can not have the channel of first user, but can speculate to use.
In prior art, obtain a kind of method of spectrum information for adopting the mode in inquiry frequency spectrum data storehouse (Spectrum database): the spectrum information of being safeguarded a specific geographical area by a central database, the second user can inquire about available spectrum information in this database, speculates to use.Be accompanied by the development of the method for database-driven, " netboot " problem is a basic problem, and guiding refers to that the second user obtains local available frequency spectrum resource information when initialization, thereby realizes the process of later data communication.
Main equipment refers to and can directly by wired or wireless network, be connected to the equipment in a frequency spectrum data storehouse, refers to from equipment, can only indirectly from frequency spectrum data storehouse, obtain spectrum information by main equipment by the equipment not directly being connected with this frequency spectrum data storehouse from equipment.This main equipment and belong to the second user from equipment, can speculate to use the idle frequency range of first user, uses the band inner connection method based on this free time frequency range completely, can promote the use of frequency spectrum share under database-driven.
In prior art, disclose in a kind of single-hop cognitive radio networks guiding in band and used the method for the channel idle frequency range of first user, in this single-hop cognitive radio networks, comprised: the main equipment being connected with database, be only connected with main equipment from equipment.Main equipment sends and to carry the beacon that available channel arrives, and when receiving this beacon from equipment, builds on the connection of main equipment, and main equipment is inquired about and obtained this and send to from equipment from whole spectrum informations of equipment in database.
Because the information from carrying between equipment and main equipment may have overlappingly, main equipment, from data base querying and while obtaining the frequency spectrum of database feedback, repeats the information of lap inquiry and repeats transmission, loses time and takies a large amount of transmission channels.And, while adopting the method in multi-hop wireless electricity cognition network, when redirect repeatedly from equipment query spectrum information time, whole spectrum informations need to be repeated to send, the transmission time is long, takies in a large number unnecessary transmission channel, wastes resource.
Summary of the invention
In view of this, the object of the present invention is to provide the interior bootstrap technique of band of the cognitive radio networks of database-driven, realize main equipment and from equipment multi-hop, used the channel idle frequency range of first user, obtain the frequency spectrum resource information that can use from equipment of described cognitive radio networks to be connected, thereby realize, this is to be connected from the later data communication of equipment.
The band of cognitive radio networks in a bootstrap technique, comprising:
Current device receives the first Query Information that subset sends, the spectrum information that described the first Query Information can be used for inquiring about the idle frequency range of the first user from device request inquiry of described cognitive radio networks to be connected;
Current device, according to the spectrum information of this locality storage, is deleted the corresponding Query Information of spectrum information of storing with described this locality in described the first Query Information, obtains the second Query Information, and the corresponding Query Information of spectrum information of storage and described local storage;
Judge whether current device is main equipment, if so, send described the second Query Information to described frequency spectrum data library inquiry; Otherwise, send described the second Query Information to parent device;
When current device receives the first response message of parent device or described frequency spectrum data storehouse feedback, from the spectrum information of this locality storage, obtain the spectrum information corresponding with the Query Information of deleting, and be added into described the first response message, obtain the second response message and be sent to described subset; In described the first response message, comprise and the corresponding spectrum information of described the second Query Information.
Above-mentioned method, preferred, before receiving the first Query Information of subset transmission, also comprise:
Current device obtains the available channel of current device, and according to default rule frequency hopping in described available channel;
Current device broadcast transmission is carried the beacon of the available channel information of current device so that receive that the subset of described beacon is determined and current device between can be shared channel, and enter described channel hopping that can be shared;
When the frequency hopping of described subset frequency hopping and current device meets default condition of contact, described subset and current device are set up the interface channel of transmission information, to transmit described the first Query Information.
Above-mentioned method, preferred, described default condition of contact comprises: the time that parent device and current device take same channel meets default minimum overlapping time.
Above-mentioned method, preferred, before receiving the first response message of parent device feedback, also comprise:
Described current device receives the beacon of the described parent device available channel information of parent device broadcast transmission;
The described beacon of described current device foundation is determined channel that can be shared between described current device and described parent device, and enters described channel hopping that can be shared;
When described current device frequency hopping and described parent device frequency hopping meet default condition of contact, described parent device and current device are set up the interface channel of transmission information, to transmit described the first response message.
Above-mentioned method, preferred, described default condition of contact comprises: the time that subset and current device take same channel meets default minimum overlapping time.
Above-mentioned method, preferably, described multi-hop cognition radio net is divided into plural unit lattice, in described frequency spectrum data storehouse, comprise the whole usable spectrum information in described multi-hop cognition radio net, in described frequency spectrum data storehouse, the corresponding frequency spectrum inventory of arbitrary unit lattice, can obtain described whole usable spectrum information according to the whole frequency spectrum inventories in described frequency spectrum data storehouse.
Above-mentioned method, preferably, in described the first Query Information, carry the positional information from equipment of described cognitive radio networks to be connected, described current device is according to the spectrum information of this locality storage, delete the corresponding Query Information of spectrum information of storing with described this locality in described the first Query Information, comprising:
Current device is according to the positional information from equipment of the described cognitive radio networks to be connected carrying in described the first Query Information, obtain described described cognitive radio networks to be connected from unit lattice corresponding to equipment;
Current device obtains according to the spectrum information of this locality storage the unit lattice that current device is corresponding;
Compare described described cognitive radio networks to be connected from unit lattice corresponding to equipment and unit lattice corresponding to current device, obtain the unit lattice that overlap;
Current device obtains corresponding spectrum information according to the unit lattice of described coincidence, and deletes Query Information corresponding with corresponding spectrum information in described the first Query Information.
Above-mentioned method, preferred, the described spectrum information of storing from this locality, obtain the spectrum information corresponding with the Query Information of deleting, and be added into described the first response message, comprising:
Resolve described the first response message, obtain the information from equipment of described cognitive radio networks to be connected corresponding to described the first response message;
The information from equipment according to described cognitive radio networks to be connected, obtains the Query Information of deleting from the first Query Information;
From local storage region, obtain the spectrum information corresponding with the Query Information of deleting, add this spectrum information to described the first response message, obtain the second response message.
Above-mentioned method, preferred, the spectrum information that the idle frequency range at first user from device request inquiry of described described cognitive radio networks to be connected can be used, comprising:
The spectrum information that can use in the idle frequency range of first user from equipment of described described cognitive radio networks to be connected;
Or, described described cognitive radio networks to be connected from equipment, query context is set, the spectrum information that described query context can be used in the idle frequency range of first user according to default rule;
Or, whole spectrum informations that the idle frequency range of described first user can be used.
Above-mentioned method, preferably, the spectrum information that can use when the idle frequency range at first user from device request inquiry of described described cognitive radio networks to be connected, can use for the idle frequency range of described first user whole spectrum information time, described current device also comprises after receiving the first Query Information of subset transmission:
When the spectrum information of the local storage of judgement is whole spectrum information of the cognitive radio networks under described current device, carry out and delete the corresponding Query Information of spectrum information of storing with described this locality in described the first Query Information, obtain the second Query Information step;
Otherwise, according to whole spectrum informations of described cognitive radio networks, generate the 3rd response message, send the 3rd response message to subset.
Bootstrap technique in the band of the cognitive radio networks of database-driven provided by the invention, when forwarding the Query Information from equipment of described cognitive radio networks to be connected to database, by main equipment and as this multistage parent device from equipment to be connected from equipment, this Query Information is deleted, obtain with main equipment with as the final Query Information without the content that overlaps from equipment of this multistage parent device from equipment to be connected, and inquire about in frequency spectrum data storehouse according to this final Query Information.In this frequency spectrum data storehouse, feed back after the spectrum information that this final Query Information is corresponding, again by main equipment and as this multistage parent device from equipment to be connected from equipment to successively adding spectrum information corresponding to Query Information of deleting before self this spectrum information, finally obtain the spectrum information from equipment of this described cognitive radio networks to be connected.In this process, by main equipment with from forwarding inquiries information and spectrum information layer by layer between equipment, final obtain described cognitive radio networks to be connected from the required frequency spectrum resource information of equipment, thereby for later data communication provides foundation, and according to the frequency spectrum resource information of storing in current device, during forwarding inquiries information, reduce layer by layer query contents, while forwarding the spectrum information feeding back, increase layer by layer, reduce the content of transfer of data, taken less transmission channel, transmission speed speeds, reduces boot time.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of bootstrap technique embodiment 1 in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 2 is the flow chart of bootstrap technique embodiment 2 in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 3 is the flow chart of bootstrap technique embodiment 3 in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 4 is the flow chart of bootstrap technique embodiment 4 in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 5 is current device unit's lattice schematic diagram in bootstrap technique embodiment 4 in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 6 is the flow chart of bootstrap technique embodiment 5 in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 7 is the flow chart of bootstrap technique embodiment 6 in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 8 is bootstrap technique application scenarios one schematic diagram in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Fig. 9 is the flow chart of bootstrap technique application scenarios in the band of cognitive radio networks of a kind of database-driven of providing of the application;
Figure 10 be in the band of cognitive radio networks of a kind of database-driven of providing of the application in bootstrap technique application scenarios Query Information send schematic diagram one;
Figure 11 be in the band of cognitive radio networks of a kind of database-driven of providing of the application in bootstrap technique application scenarios Query Information send schematic diagram two;
Figure 12 be in the band of cognitive radio networks of a kind of database-driven of providing of the application in bootstrap technique application scenarios Query Information send schematic diagram three;
Figure 13 be in the band of cognitive radio networks of a kind of database-driven of providing of the application in bootstrap technique application scenarios Query Information send schematic diagram four;
Figure 14 be in the band of cognitive radio networks of a kind of database-driven of providing of the application in bootstrap technique application scenarios Query Information send schematic diagram five;
Figure 15 be in the band of cognitive radio networks of a kind of database-driven of providing of the application in bootstrap technique application scenarios Query Information send schematic diagram six.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, show the flow chart of bootstrap technique embodiment 1 in the band of cognitive radio networks of a kind of database-driven that the application provides, comprising:
Step S101: current device receives the first Query Information that subset sends, the spectrum information that described the first Query Information can be used for inquiring about the idle frequency range of the first user from device request inquiry of described cognitive radio networks to be connected;
To be connected while adding this cognitive radio networks from guiding in equipment belt, need first obtain in the idle frequency range of this cognitive radio networks first user equipment, the spectrum information that can use from equipment that this is to be connected, what this was to be connected inquires about this available spectrum information from equipment transmission Query Information.
Current device receives the first Query Information that its subset sends, and this first Query Information user inquires about this spectrum information from device request inquiry to be connected.The spectrum information of this request can be to be connected from the available spectrum information of equipment self for this; Also can be this to be connected query context arranging according to default rule from equipment, the available spectrum information that this query context is corresponding; Even, the spectrum information of this request is whole spectrum information in the idle frequency range of first user equipment.
The subset of current device is that this is to be connected during from equipment, and this first Query Information is exactly the to be connected Query Information sending from equipment; When the subset of this current device is not that this is to be connected during from equipment, this first Query Information is through current device and to be connected from one or more between equipment, from equipment, forward layer by layer and come, and the two is incomplete same.
Step S102: current device is according to the spectrum information of this locality storage, delete the corresponding Query Information of spectrum information of storing with described this locality in described the first Query Information, obtain the second Query Information, and the corresponding Query Information of spectrum information of storage and described local storage;
This locality of current device stores its available spectrum information, this spectrum information may and its subset or parent device between exist overlappingly, in order to reduce the data volume of communication, the information overlapping is no longer transmitted.
Receive after this first Query Information, current device finds from the first Query Information and the Query Information of the part that the local spectrum information of storing overlaps, and deletes this Query Information corresponding with this spectrum information intersection, obtains the second Query Information.
And store the Query Information of this deletion, for follow-up operation.
Step S103: judge whether current device is main equipment, if so, send described the second Query Information to described frequency spectrum data library inquiry; Otherwise, send described the second Query Information to parent device;
Judge whether current device is main equipment, when this current device is main equipment, because main equipment is directly connected with frequency spectrum data storehouse, can directly sends this second Query Information and inquire about in frequency spectrum data storehouse;
Otherwise this current device is from equipment, from equipment, need indirectly be connected with frequency spectrum data storehouse by main equipment, need to continue this second Query Information to send to the parent device of this current device.The parent device of this current device continues the Query Information of the part overlapping with the spectrum information of its storage in the second Query Information obtaining to delete, in the parent device or the frequency spectrum data storehouse that send to this parent device, S101 is to step S103 for circulation execution step, until by be connected the sending to frequency spectrum data storehouse from frequency spectrum Query Information corresponding to equipment of inquiry.
Wherein, there are a kind of special circumstances, when through multilayer parent device, Query Information being deleted to forwarding, in the N Query Information that the parent device of M level receives, corresponding spectrum information is completely contained in the spectrum information of this locality storage of this parent device, the parent device of this M level directly sends spectrum information that this N Query Information is corresponding in its subset, needn't continue to be transferred in frequency spectrum data storehouse again and inquire about.
Step S104: when current device receives the first response message of parent device or described frequency spectrum data storehouse feedback, from the spectrum information of this locality storage, obtain the spectrum information corresponding with the Query Information of deleting, and be added into described the first response message, obtain the second response message and be sent to described subset.
In described the first response message, comprise and the corresponding spectrum information of described the second Query Information.
When this current device is main equipment, it receives first response message corresponding with the second Query Information of frequency spectrum data storehouse feedback, or when current device is not main equipment, it receives first response message corresponding with the second Query Information of its parent device feedback.
But when this current device receives the first response message, this first response message is corresponding with the second Query Information that this current device sends, current device is according to the Query Information of deleting in step S102, in the spectrum information of this locality storage, obtain the spectrum information corresponding with the Query Information of this deletion, this spectrum information is added in this first response message, obtain the second response message, and the second response message is sent in subset.
When the subset of this current device is to be connected during from equipment, this spectrum information from this second response message of equipment direct basis to be connected carries out communication; When the subset of this current device is not to be connected during from equipment, the Query Information that this subset is deleted in conjunction with oneself, in the spectrum information of its local storage, obtain the spectrum information corresponding with this Query Information, and this spectrum information is added in the second response message, continue to send to the subset of this subset, circulation execution step S104, until that response message sends to is to be connected from equipment.
Bootstrap technique in the band of the cognitive radio networks of the database-driven that the embodiment of the present invention 1 provides, by main equipment with from forwarding inquiries information and spectrum information layer by layer between equipment, the required frequency spectrum resource information of subset that final acquisition is connecting, thereby for later data communication provides foundation, and according to the frequency spectrum resource information of storing in current device, during forwarding inquiries information, reduce layer by layer query contents, while forwarding the spectrum information feeding back, increase layer by layer, reduced the content of transfer of data, take less transmission channel, transmission speed speeds, reduce boot time.
Embodiment 2
Referring to Fig. 2, show the flow chart of bootstrap technique embodiment 2 in the band of cognitive radio networks of a kind of database-driven that the application provides, shown in Fig. 1, in flow chart, before step S101, also comprise:
Step S105: current device obtains the available channel of current device, and according to default rule frequency hopping in described available channel;
In cognitive radio networks, between parent device and subset, form tree structure, a parent device can connect a plurality of subsets, the channel that each subset can be used is different, parent device all carries out communication in order to guarantee with its subset, this parent device is carried out frequency hopping on its available channel, connects successively with its subset.
Current device obtains self current available channel, and according to default rule frequency hopping in this available channel.This default rule can be for calculating according to channel hopping.
Existing channel hopping algorithm comprises: do not distinguish sender and recipient's symmetry algorithm, and be the asymmetric arithmetic that sender and recipient produce different Channel Hopping Sequences.
This symmetry algorithm comprises: (Jump-stay) algorithms such as jumping, the algorithm based on candidate group (Quorum) and symmetrical asynchronous channel hopping (Symmetric Asynchronous Rendezvous Channel Hopping, the SARCH) algorithm that converges.
This asymmetric arithmetic comprises: asynchronous channel hopping (Asynchronous Rendezvous Channel Hopping, ARCH) algorithm and asynchronous channel jump (Asynchronous Channel Hopping, ACH) algorithm of converging.
Step S106: current device broadcast transmission is carried the beacon of the available channel information of current device so that receive that the subset of described beacon is determined and current device between can be shared channel, and enter described channel hopping that can be shared;
The beacon of its available channel information of current device broadcast transmission, when this current device from equipment, receive this beacon time, can according to this beacon confirm this subset and current device can be shared channel, and enter the channel that this can be shared, also frequency hopping channel that can be shared at this from equipment, with realize with current device between be connected.
Step S107: when the frequency hopping of described subset frequency hopping and current device meets default condition of contact, described subset and current device are set up the interface channel of transmission information, to transmit described the first Query Information.
Default condition of contact comprises: the time that subset and current device take same channel meets default minimum overlapping time, and be 20ms this minimum overlapping time.
When the time that takies same channel of this subset and current device is more than or equal to 20ms, realized being connected of subset and current device, the passage that connects, subset transmits this first Query Information in current device by this interface channel.
Because the required minimum overlay time of the ieee standard IEEE802.22 for cognitive radio is 10ms, so taking the time that be Hopping time sheet satisfied default minimum overlapping time of the time of same channel, subset and current device be at least 20ms.
Be to give tacit consent to the IEEE802.22 standard that adopts in the present embodiment, therefore, be 20ms minimum overlapping time, but be not limited to this, in actual enforcement, when adopting other communication standard, can set minimum overlapping time according to accepted standard.
The content of recording in the embodiment of the present application 2 is known, before norator equipment is looked into information to his father's device transmission, all adopts step S105-step S107 to set up the interface channel of communication between its parent device and this subset.
Bootstrap technique in the band of the cognitive radio networks of the database-driven that the embodiment of the present invention 2 provides, current device passes through the information of its available channel of beacon transmissions to its subset, subset receive determine after described beacon and current device between can be shared channel, and enter described channel hopping that can be shared; When the frequency hopping of described subset frequency hopping and current device meets default condition of contact, described subset and current device are set up the interface channel of transmission information, to transmit described the first Query Information.To setting up the process of the interface channel of transmission the first Query Information between current device and subset, be illustrated, for carrying out the transmission of the first Query Information, provide path.
Embodiment 3
Referring to Fig. 3, show the flow chart of bootstrap technique embodiment 3 in the band of cognitive radio networks of a kind of database-driven that the application provides, shown in Fig. 1, in flow chart, between step S103 and 104, also comprise:
Step S108: described current device receives the beacon of the described parent device available channel information of parent device broadcast transmission;
Parent device can obtain self current available channel, and according to default rule frequency hopping in this available channel.This default rule can be for calculating according to channel hopping.
Existing channel hopping algorithm comprises: do not distinguish sender and recipient's symmetry algorithm, and be the asymmetric arithmetic that sender and recipient produce different Channel Hopping Sequences.
This symmetry algorithm comprises: jump scheduling algorithm, based on Quorum algorithm and SARCH algorithm.
This asymmetric arithmetic comprises: ARCH algorithm and ACH algorithm.
Step S109: the described beacon of described current device foundation is determined channel that can be shared between described current device and described parent device, and enter described channel hopping that can be shared;
The beacon of its available channel information of parent device broadcast transmission, current device as this parent device from equipment, receive this beacon time, can according to this beacon confirm this current device and its parent device can be shared channel, and enter the channel that this can be shared, current device can be shared at this channel in also frequency hopping, with realize with parent device between be connected.
Step S110: when described current device frequency hopping and described parent device frequency hopping meet default condition of contact, described parent device and current device are set up the interface channel of transmission information, to transmit described the first response message.
Default condition of contact comprises: the time that parent device and current device take same channel meets default minimum overlapping time, and be 20ms this minimum overlapping time.
When the time that takies same channel of this parent device and current device is more than or equal to 20ms, realized being connected of parent device and current device, the passage that connects, parent device transmits this first response message in current device by this interface channel.
Because the required minimum overlay time of the ieee standard IEEE802.22 for cognitive radio is 10ms, so taking the time that be Hopping time sheet satisfied default minimum overlapping time of the time of same channel, parent device and current device be at least 20ms.
Be to give tacit consent to the IEEE802.22 standard that adopts in the present embodiment, therefore, be 20ms minimum overlapping time, but be not limited to this, in actual enforcement, when adopting other communication standard, can set minimum overlapping time according to accepted standard.
The content of recording in the embodiment of the present application 3 is known, and parent device all adopts step S108-step S110 to set up the interface channel of communication between parent device and its subset before looking into information to its subset transmission.
Bootstrap technique in the band of the cognitive radio networks of the database-driven that the embodiment of the present invention 3 provides, described current device receives the beacon of the described parent device available channel information of parent device broadcast transmission; The described beacon of described current device foundation is determined channel that can be shared between described current device and described parent device, and enters described channel hopping that can be shared; When described current device frequency hopping and described parent device frequency hopping meet default condition of contact, described parent device and current device are set up the interface channel of transmission information, to transmit described the first response message.To setting up the process of the interface channel of transmission the first response message between current device and parent device, be illustrated, for carrying out the transmission of the first response message, provide path.
Embodiment 4
In the present embodiment, this multi-hop cognition radio net is divided into plural unit lattice, in described frequency spectrum data storehouse, comprise the whole usable spectrum information in described multi-hop cognition radio net, in described frequency spectrum data storehouse, the corresponding frequency spectrum inventory of arbitrary unit lattice, can obtain described whole usable spectrum information according to the whole frequency spectrum inventories in described frequency spectrum data storehouse.Described frequency spectrum inventory comprises: the numbering of channel, availability, maximum transmission power and up duration section.
Referring to Fig. 4, show the flow chart of bootstrap technique embodiment 4 in the band of cognitive radio networks of a kind of database-driven that the application provides, shown in Fig. 1, in flow chart, step S102 comprises:
Step S1021: current device is according to the positional information from equipment of the described cognitive radio networks to be connected carrying in described the first Query Information, obtain described described cognitive radio networks to be connected from unit lattice corresponding to equipment;
Current device unit's lattice schematic diagram as shown in Figure 5, each equipment (comprise main equipment and from equipment) maximum communication scope is r
b, the region that current device covers unit lattice is the region shown in dotted line, the positional information A that the center of circle is this current device, and the region that subset covers unit lattice is the region shown in chain-dotted line, the positional information B that the center of circle is this subset.
When described cognitive radio networks to be connected from equipment, send Query Information time, at Query Information, carry this address information from equipment to be connected, and also carry this address information follow-up the first Query Information generating according to this to be connected Query Information sending from equipment, and just can obtain this corresponding unit lattice from equipment to be connected according to this positional information.
Step S1022: current device obtains according to the spectrum information of this locality storage the unit lattice that current device is corresponding;
Current device this locality stores spectrum information, this spectrum information finally obtains from frequency spectrum data storehouse, and due to the relation of the spectrum information in frequency spectrum data storehouse and unit lattice, in this current device, the spectrum information of local storage and the unit lattice of this current device also have corresponding relation, so current device just can obtain according to the spectrum information of this locality storage the unit lattice that this current device is corresponding.
Step S1023: compare described described cognitive radio networks to be connected from unit lattice corresponding to equipment and unit lattice corresponding to current device, obtain the unit lattice that overlap;
The corresponding frequency spectrum inventory of each unit lattice, this frequency spectrum inventory comprises numbering, availability, maximum transmission power and the up duration section of channel, this frequency spectrum inventory is exactly the spectrum information that these unit lattice are corresponding.
Compare to be connected from unit lattice corresponding to equipment and unit lattice corresponding to this current device, just can obtain the unit lattice of the two coincidence, due to the corresponding frequency spectrum inventory of each unit lattice, and this frequency spectrum inventory is exactly corresponding spectrum information content, so the unit lattice of coincidence are exactly the spectrum information of the two coincidence.
Step S1024: current device obtains corresponding spectrum information according to the unit lattice of described coincidence, and deletes Query Information corresponding with corresponding spectrum information in described the first Query Information.
Due to the to be connected spectrum information that do not store from equipment, so need to inquire about its corresponding spectrum information according to these unit lattice.
Current device is according to the unit lattice of this coincidence, obtain the spectrum information of its local storage, delete Query Information corresponding with this spectrum information in the first Query Information, just can obtain the Query Information of other information that the spectrum information of the two coincidence is removed in inquiry, i.e. the second Query Information.
Owing to having deleted partial query information, the data volume of the second Query Information is less than the first Query Information, and the data volume of transmission is diminished, and takies less transmission channel, transmission speed speeds, reduces boot time.
Bootstrap technique in the band of the cognitive radio networks of the database-driven that the embodiment of the present invention 4 provides, by determining the positional information from equipment to be connected according to the first Query Information, and then the unit lattice from equipment that this is to be connected have been determined, and obtain this current device unit lattice of from equipment overlapping to be connected with this, determined in current device and obtained corresponding spectrum information with the described unit lattice that overlap, and deleted Query Information corresponding with corresponding spectrum information in described the first Query Information.To owing to having deleted partial query information, the data volume of the second Query Information is less than the first Query Information, and the data volume of transmission is diminished, and takies less transmission channel, transmission speed speeds, reduces boot time.
Embodiment 5
Referring to Fig. 6, show the flow chart of bootstrap technique embodiment 5 in the band of cognitive radio networks of a kind of database-driven that the application provides, shown in Fig. 1, in flow chart, step S104 comprises:
Step S1041: resolve described the first response message, obtain the information from equipment of described cognitive radio networks to be connected corresponding to described the first response message;
When frequency spectrum data storehouse is according to through main equipment with layer by layer from the Query Information of device forwards (this Query Information is for inquiring about the spectrum information from equipment of described cognitive radio networks to be connected), inquire about the spectrum information that this Query Information is corresponding, and this spectrum information is sent to main equipment as response message, by main equipment, send to its subset again, forward layer by layer.Understandable, for guarantee this spectrum information can feed back to described cognitive radio networks to be connected from equipment, in this response message, also need to carry with this described cognitive radio networks to be connected from device-dependent information.
When receiving the first response message, in this first response message to there being the information from equipment with described cognitive radio networks to be connected, resolve this first response message, just can obtain the information from equipment of described cognitive radio networks to be connected corresponding to this first response message.
Step S1042: the information from equipment according to described cognitive radio networks to be connected, obtains the Query Information of deleting from the first Query Information;
According to the information from equipment of described cognitive radio networks to be connected corresponding to this first response message, can in current device, inquire about the Query Information of deleting from the first Query Information.The Query Information of this deletion is originally during this current device forwards first Query Information, the Query Information corresponding to spectrum information of the coincidence of deletion.
Step S1043: obtain the spectrum information corresponding with the Query Information of deleting from local storage region, add this spectrum information to described the first response message, obtain the second response message.
According to the Query Information of this deletion, just can from the local storage region of current device, obtain the spectrum information corresponding with the Query Information of this deletion, this spectrum information and current device and described cognitive radio networks to be connected from the identical spectrum information of equipment, this identical spectrum information is added in the first response message, obtain the second response message, this second response message is exactly the information that sends to subset, again by subset add its with described cognitive radio networks to be connected from the identical spectrum information of equipment, forward downwards successively.
In sending the process of response message, frequency spectrum data storehouse sends to the spectrum information of main equipment to be: the spectrum information all not having from the multilayer parent device of equipment of described cognitive radio networks to be connected, in repeating process, add with this main equipment or from spectrum information corresponding to the Query Information of unit deletion gradually.In this transmitting procedure, reduced the spectrum information amount of the transmission of each equipment room.
Bootstrap technique in the band of the cognitive radio networks of the database-driven that the embodiment of the present invention 5 provides, when receiving the first response message of parent device transmission, obtain spectrum information corresponding to Query Information of deleting while forwarding the first Query Information originally, and in this first response message, add this corresponding spectrum information, adopt the method, reduced the spectrum information amount of the transmission of each equipment room, transmission channel that overall transfer takies is few, transmission speed speeds, reduce boot time.
Embodiment 6
Referring to Fig. 7, show the flow chart of bootstrap technique embodiment 6 in the band of cognitive radio networks of a kind of database-driven that the application provides, shown in Fig. 1, in flow chart, after step S101, also comprise:
Step S111: whole spectrum informations of the cognitive radio networks under the whether described current device of spectrum information of the local storage of judgement; If so, execution step S102, otherwise execution step S112;
Whether the spectrum information that judges this locality storage of current device is whole spectrum informations of the cognitive radio networks under this current device, if words, this current device just can send to its subset by these whole spectrum informations, because each parent device sends to its subset by whole spectrum informations of cognitive radio networks, and during the secondary subset request of subset, this subset can, according to whole spectrum informations of this locality storage of self, send to secondary subset by this whole spectrum information.So this current device is exactly this parent device from equipment to be connected.
Whether the spectrum information that first judges this locality storage of this current device is whole spectrum informations of the cognitive radio networks under it, if not, need to from other equipment or frequency spectrum data storehouse, obtain the spectrum information not comprising in this current device, perform step S102.
Step S112: the whole spectrum informations according to described cognitive radio networks generate the 3rd response message, sends the 3rd response message to subset.
When the spectrum information of storing when this locality of judgement current device is whole spectrum information of the cognitive radio networks under this current device, current device directly generates the 3rd response message by spectrum information of its local storage, and sends to its subset---and to be connected from equipment.
Described cognitive radio networks to be connected from equipment, always to its parent device, send request the whole spectrum informations this cognitive radio networks, its parent device sends to this from equipment the whole spectrum informations in this radio net, due to inquiry each time, this described cognitive radio networks to be connected from equipment, can obtain whole spectrum informations, so, when this described cognitive radio networks to be connected from equipment connection to this cognitive radio networks, during whole spectrum information in its this cognitive radio networks of subset request, it directly gets whole spectrum informations of this cognitive radio networks and sends to its subset from the storage of this locality, in this cognitive radio networks, cancelled multi-hop like this, the form of only having single-hop.
Bootstrap technique in the band of the cognitive radio networks of the database-driven that the embodiment of the present invention 6 provides, the first Query Information be described cognitive radio networks to be connected from equipment, to be sent to its parent device be current device, while being used for inquiring about whole spectrum information of cognitive radio networks, current device directly feeds back to the whole spectrum informations in described cognitive radio networks that this is to be connected from equipment, without forwarding inquiries information and response message layer by layer, boot time is short.
Referring to Fig. 8, show bootstrap technique application scenarios schematic diagram in the band of cognitive radio networks of a kind of database-driven that the application provides, in this scene, comprise: secondary parent device Q, main equipment M and the frequency spectrum data storehouse of one-level parent device V, the W from equipment W, W of described cognitive radio networks to be connected, W, V, U, M and database are connected successively.Dashed region represents that respectively each is from the spectral range of equipment (W, U, Q), and the radius of this spectral range is r
b, each circle intersection is overlapping region.
The spectrum information that the first Query Information can be used for inquiring about the idle frequency range of the first user from device request inquiry of described cognitive radio networks to be connected.The spectrum information of this request can be to be connected from the available spectrum information of equipment self for this; Also can be this to be connected query context arranging according to default rule from equipment, the available spectrum information that this query context is corresponding; Even, the spectrum information of this request is whole spectrum information in the idle frequency range of first user equipment.
When the spectrum information of this request is the to be connected query context arranging according to default rule from equipment, during available spectrum information corresponding to this query context, this spectrum information scope from equipment s request to be connected can be any function f () apart from the jumping figure of main equipment h (s) about it, and this query context is r (s)=f (h (s)).
In the band of the cognitive radio networks of a kind of database-driven that the application provides, in bootstrap technique, in the process due to guiding, boot time is an important parameter, so this query context can be set at last: r (s)=(1+h (s)
a) d
max.
Wherein, this ∈ R, d
maxthe ultimate range of any two neighbor devices in cognitive radio networks.When a=-∝, r (s)=d
max, now, the spectrum information of this request is that this is to be connected from the available spectrum information of equipment self, and when a=∝, the spectrum information of this request is whole spectrum information in the idle frequency range of first user equipment.
In this application scene, while being exactly a=-∝, i.e. the spectrum information of this request is this scene from the available spectrum information of equipment self to be connected.
Referring to Fig. 9, show the flow chart of bootstrap technique application scenarios in the band of cognitive radio networks of a kind of database-driven that the application provides, comprising:
Step S201: to be connected sends Query Information 1 to from equipment V from equipment W;
Query Information as shown in figure 10 sends schematic diagram one, the region of Query Information 1 correspondence when dash area represents in figure.This Query Information 1, to be connected sending to from equipment V from equipment W, by from equipment U, arrives main equipment M, by this main equipment M, is sent in frequency spectrum data storehouse and is inquired about, and direction of arrow indication sends the direction of Query Information.
The region of Query Information 1 correspondence from equipment W that this is to be connected is for take W as the center of circle, r
bborder circular areas for radius.
Step S202: according to the spectrum information of this locality storage and this Query Information 1, obtain this from equipment V and the spectral regions 1 ' from overlapping between equipment W to be connected from equipment V;
Query Information shown in Figure 11 sends schematic diagram two, should be from region corresponding to the spectrum information of equipment V for take V as the center of circle in figure, and r
bborder circular areas for radius.
Should be from the part overlapping between equipment V and W with shadow representation in Figure 11, expression be exactly the spectral regions of the two coincidence, direction of arrow indication sends the direction of Query Information.
Step S203: by deleting the content corresponding with the spectral regions of this coincidence Query Information 1, obtain Query Information 2, and send to from equipment U from equipment V;
From equipment V, by deleting the content corresponding with the spectral regions of this coincidence Query Information 1, obtain Query Information 2, in this Query Information 2, content is the region that circular W removes the part overlapping with circular V.
Query Information shown in Figure 12 sends schematic diagram three, and what in figure, dash area represented is the region of Query Information 2 correspondences, and direction of arrow indication sends the direction of Query Information.
Step S204: according to spectrum information and the Query Information 2 of this locality storage, obtain this spectral regions 2 ' from overlapping between equipment U and Query Information 2 from equipment U;
Query Information shown in Figure 13 sends schematic diagram four, should be from region corresponding to the spectrum information of equipment U for take U as the center of circle in figure, and r
bborder circular areas for radius.
Should be from the part overlapping between equipment U and Query Information 2 with shadow representation in Figure 13, expression be exactly the spectral regions of the two coincidence, the direction of arrow is indicated the direction of transmission Query Information.
Step S205: by deleting the content 2 ' corresponding with the spectral regions of this coincidence Query Information 2, obtain Query Information 3, and send to main equipment M from equipment U;
From equipment U, by deleting the content 2 ' corresponding with the spectral regions of this coincidence Query Information 2, obtain Query Information 3.In this Query Information 3, content is that circular W removes the part overlapping with circular V and removes after the part overlapping with circle U remaining region.
Query Information shown in Figure 14 sends schematic diagram five, and what in figure, dash area represented is the region of Query Information 3 correspondences, and direction of arrow indication sends the direction of Query Information.
Step S206: main equipment M sends Query Information 3 and inquires about in frequency spectrum data storehouse;
Due to main equipment M and between equipment W, there is no overlapping region, do not need to carry out the deletion switch process of Query Information.
Query Information shown in Figure 15 sends schematic diagram six, and what in figure, dash area represented is the region of Query Information 3 correspondences, and direction of arrow indication sends the direction of Query Information 3.
Step S207: the spectrum information A corresponding with Query Information 3 that frequency spectrum data storehouse obtains inquiry is sent to main equipment M;
Step S208: main equipment M is transmitted to spectrum information 11 from equipment U;
This spectrum information 11 is corresponding with Query Information 3, dash area region in corresponding Figure 13.
Step S209: add the spectrum information 22 ' corresponding with content 2 ' from equipment U this spectrum information 11, obtain spectrum information 12, and this spectrum information 12 is sent to from equipment V;
This spectrum information 12 is corresponding with Query Information 2, dash area region in corresponding Figure 11.
Step S210: add the spectrum information 21 ' corresponding with content 1 ' from equipment V this spectrum information 12, obtain spectrum information 13, and this spectrum information 13 is sent to be connected from equipment W.
This spectrum information 13 is corresponding with Query Information 1, dash area region in corresponding diagram 9, the i.e. spectrum information from equipment W to be connected.To be connected from equipment W receives this spectrum information, build on the contact between this cognitive radio networks, become the real from equipment of this cognitive radio networks.
In each above-mentioned step, while carrying out communication between each equipment, be all first by beacon broadcast and frequency hopping, to have realized connecting path, then the communication carrying out, in this application scene, repeat no more.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a bootstrap technique in the band of the cognitive radio networks of database-driven, is characterized in that, comprising:
Current device receives the first Query Information that subset sends, the spectrum information that described the first Query Information can be used for inquiring about the idle frequency range of the first user from device request inquiry of described cognitive radio networks to be connected;
Current device, according to the spectrum information of this locality storage, is deleted the corresponding Query Information of spectrum information of storing with described this locality in described the first Query Information, obtains the second Query Information, and the corresponding Query Information of spectrum information of storage and described local storage;
Judge whether current device is main equipment, if so, send described the second Query Information to described frequency spectrum data library inquiry; Otherwise, send described the second Query Information to parent device;
When current device receives the first response message of parent device or described frequency spectrum data storehouse feedback, from the spectrum information of this locality storage, obtain the spectrum information corresponding with the Query Information of deleting, and be added into described the first response message, obtain the second response message and be sent to described subset; In described the first response message, comprise and the corresponding spectrum information of described the second Query Information.
2. method according to claim 1, is characterized in that, before receiving the first Query Information of subset transmission, also comprises:
Current device obtains the available channel of current device, and according to default rule frequency hopping in described available channel;
Current device broadcast transmission is carried the beacon of the available channel information of current device so that receive that the subset of described beacon is determined and current device between can be shared channel, and enter described channel hopping that can be shared;
When the frequency hopping of described subset frequency hopping and current device meets default condition of contact, described subset and current device are set up the interface channel of transmission information, to transmit described the first Query Information.
3. method according to claim 2, is characterized in that, described default condition of contact comprises: the time that parent device and current device take same channel meets default minimum overlapping time.
4. method according to claim 1, is characterized in that, before receiving the first response message of parent device feedback, also comprises:
Described current device receives the beacon of the described parent device available channel information of parent device broadcast transmission;
The described beacon of described current device foundation is determined channel that can be shared between described current device and described parent device, and enters described channel hopping that can be shared;
When described current device frequency hopping and described parent device frequency hopping meet default condition of contact, described parent device and current device are set up the interface channel of transmission information, to transmit described the first response message.
5. method according to claim 4, is characterized in that, described default condition of contact comprises: the time that subset and current device take same channel meets default minimum overlapping time.
6. method according to claim 1, it is characterized in that, described multi-hop cognition radio net is divided into plural unit lattice, in described frequency spectrum data storehouse, comprise the whole usable spectrum information in described multi-hop cognition radio net, in described frequency spectrum data storehouse, the corresponding frequency spectrum inventory of arbitrary unit lattice, can obtain described whole usable spectrum information according to the whole frequency spectrum inventories in described frequency spectrum data storehouse.
7. method according to claim 6, it is characterized in that, in described the first Query Information, carry the positional information from equipment of described cognitive radio networks to be connected, described current device is according to the spectrum information of this locality storage, delete the corresponding Query Information of spectrum information of storing with described this locality in described the first Query Information, comprising:
Current device is according to the positional information from equipment of the described cognitive radio networks to be connected carrying in described the first Query Information, obtain described described cognitive radio networks to be connected from unit lattice corresponding to equipment;
Current device obtains according to the spectrum information of this locality storage the unit lattice that current device is corresponding;
Compare described described cognitive radio networks to be connected from unit lattice corresponding to equipment and unit lattice corresponding to current device, obtain the unit lattice that overlap;
Current device obtains corresponding spectrum information according to the unit lattice of described coincidence, and deletes Query Information corresponding with corresponding spectrum information in described the first Query Information.
8. method according to claim 1, is characterized in that, the described spectrum information of storing from this locality, obtains the spectrum information corresponding with the Query Information of deleting, and is added into described the first response message, comprising:
Resolve described the first response message, obtain the information from equipment of described cognitive radio networks to be connected corresponding to described the first response message;
The information from equipment according to described cognitive radio networks to be connected, obtains the Query Information of deleting from the first Query Information;
From local storage region, obtain the spectrum information corresponding with the Query Information of deleting, add this spectrum information to described the first response message, obtain the second response message.
9. method according to claim 1, is characterized in that, the spectrum information that the idle frequency range at first user from device request inquiry of described described cognitive radio networks to be connected can be used, comprising:
The spectrum information that can use in the idle frequency range of first user from equipment of described described cognitive radio networks to be connected;
Or, described described cognitive radio networks to be connected from equipment, query context is set, the spectrum information that described query context can be used in the idle frequency range of first user according to default rule;
Or, whole spectrum informations that the idle frequency range of described first user can be used.
10. method according to claim 9, it is characterized in that, the spectrum information that can use when the idle frequency range at first user from device request inquiry of described described cognitive radio networks to be connected, can use for the idle frequency range of described first user whole spectrum information time, described current device also comprises after receiving the first Query Information of subset transmission:
When the spectrum information of the local storage of judgement is whole spectrum information of the cognitive radio networks under described current device, carry out and delete the corresponding Query Information of spectrum information of storing with described this locality in described the first Query Information, obtain the second Query Information step;
Otherwise, according to whole spectrum informations of described cognitive radio networks, generate the 3rd response message, send the 3rd response message to subset.
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| WO2012032780A1 (en) * | 2010-09-09 | 2012-03-15 | 独立行政法人情報通信研究機構 | Wireless device and communication method |
| JP2012119778A (en) * | 2010-11-29 | 2012-06-21 | Toyota Infotechnology Center Co Ltd | Radio communication device |
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