CN102364978A - Radio communication method for acquiring united network state based on cognitive user signal transmission and spectrum sensing in cognitive radio network - Google Patents
Radio communication method for acquiring united network state based on cognitive user signal transmission and spectrum sensing in cognitive radio network Download PDFInfo
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Abstract
The invention provides a radio communication method for acquiring a united network state based on cognitive user signal transmission and spectrum sensing in a cognitive radio network and relates to the field of radio communication. The invention aims to solve the problems that the current communication is required to be stopped periodically, and the transmission delay for cognitive users is prolonged in the conventional radio communication method based on a method for acquiring the network state. By the method for acquiring the united network state based on cognitive user signal transmission and spectrum sensing, the radio communication is realized. Compared with the conventional method for acquiring the network state, the method has the advantages that: the current communication is not required to be stopped periodically, and the transmission delay for cognitive users is shortened to the great extent. The radio communication method can be switched between the conventional sensing mode and the united sensing mode according to the difference of current network throughputs, so that the network performance is improved. The radio communication method is applicable to the cognitive radio network.
Description
Technical field
The present invention relates to cognition wireless network field in the communication system, be specifically related to the wireless communications method that current network state is carried out perception that cognitive user is utilized control channel transmission and frequency spectrum perception associating.
Background technology
Current the cognition wireless network field generally adopt utilize the single means of frequency spectrum perception to network state (be authorized user whether occur and each frequency spectrum on the operating position of cognitive user) carry out perception.Non-online frequency spectrum perception of many employings of frequency spectrum perception cycle of current research, promptly cognitive user needs periodically current frequency spectrum to be carried out perception, when the user carries out perception, need stop current communication.The algorithm of some propositions carries out modeling through the behavior to authorized user, the occurrence law of authorized user is predicted, thereby optimized the perception cycle of cognitive user and the duration of perception fragment.
But the single frequency spectrum perception of passing through is obtained network state and had following shortcoming all the time: whether (1) cognitive user must stop current communication periodically and then current frequency spectrum carried out perception and occur to detect authorized user.(2) owing to being to adopt periodically perception, so might bump with authorized user.(3) when authorized user occurs, cognitive user must stop current communication immediately then other frequency spectrum is carried out the order perception, when perceiving usable spectrum, inserts again, and this has increased the propagation delay time of cognitive user greatly.
Summary of the invention
The present invention need periodically stop current communication in order to solve to have now based on the wireless communications method that network state is carried out acquisition methods; And the long problem of the propagation delay time of cognitive user, thereby the wireless communications method that provides in a kind of cognition wireless network the joint network state based on the transmission of cognitive user signaling and frequency spectrum perception to obtain.
The wireless communications method that obtains based on the joint network state of cognitive user signaling transmission and frequency spectrum perception in the cognition wireless network, it is characterized in that: it is realized by following steps:
The network state of stn mode perception cognition wireless network is adopted in step 1, cognitive base station, obtains the network state result under the stn mode;
Whether there is authorized user to occur among the network state result that step 2, cognitive base station determining step one obtain, if judged result is then returned execution in step one for not; If judged result is for being that then execution in step three;
Whether the authorized user described in step 3, the cognitive base station determining step two appears on the idle frequency spectrum of cognition wireless network, if judged result is for being that then execution in step 31; If judged result is that then execution in step four;
All cognitive user in the cognition wireless network are given with the information broadcast that authorized user occurs in step 3 one, cognitive base station;
Cognitive user in step 4, the cognition wireless network is selected in the window to keep out of the way number in keeping out of the way of back off algorithm at random, and several the sending into of keeping out of the way that will select kept out of the way timer;
Whether step 5, cognitive base station judges signaling channel be occupied, if judged result is for being, and execution in step May Day then; If judged result is that then execution in step six;
Step May Day, keep out of the way timer and stop timing, and return execution in step five;
Step 6, the timing number of keeping out of the way timer subtract one, and judge whether the said timing number of keeping out of the way makes zero, if judged result is then returned execution in step five for not; If judged result is for being that then execution in step seven;
Whether step 7, cognitive base station judges signaling channel have conflict, if judged result is for being that then execution in step eight; If judged result is not for, transmission success is then accomplished the radio communication of cognitive base station and cognitive user in the cognition wireless network;
Step 8, cognitive base station judges are kept out of the way window and whether are arrived maximum, if judged result for not, execution in step Aug. 1st then; If judged result is for being that then execution in step nine;
Step Aug. 1st, cognitive base station will be kept out of the way window and enlarged one times, and return execution in step four;
The network state of SSM pattern perception cognition wireless network is adopted in step 9, cognitive base station, obtains the network state result under the SSM pattern, and experience Dt time of delay; Said time of delay, the scope of Dt was 30 seconds～60 seconds;
Step 10, cognitive base station are detected among the network state result who obtains in the step 9, and whether the frequency of occurrences of authorized user is less than threshold value F, if judged result is then returned execution in step nine for not; If judged result is for being that then execution in step 11; The scope of said threshold value F is 0.4 time/second～0.6 time/second;
A perception is carried out to all channels in step 11, cognitive base station, and according to sensing results registration updating table, and the registration table after will upgrading is broadcast to all cognitive user in the cognition wireless network, and returns execution in step one.
The implication of the stn mode in the step 1 is: be utilized in cognitive user behavioural information and the frequency spectrum perception transmitted on the signaling channel and unite the method that channel status is obtained.
The implication of the SSM pattern in the step 9 is: the method for utilizing frequency spectrum perception that channel status is obtained.
Back off algorithm in the step 4 is specially: when N user is ready for sending request simultaneously; This N user need select one to keep out of the way number and deposit in and keep out of the way timer in keeping out of the way window randomly; After keeping out of the way timer and making zero, the user could use the concurrent carry information of channel; Wait for the user and to keep out of the way in the time period that timer makes zero, when the user has used current channel, need time-out clock, till channel idle; After once sending the competition failure, then keep out of the way window and enlarge one times, after sending successfully, recover the original window size; When the competition failure expands as 2 until keeping out of the way window
mDuring W, then system switches to the SSM pattern, and wherein W is a minimum competition window, and m is maximum competition number of times.
Beneficial effect: the present invention is based on the method that the cognitive user signaling is transmitted and the joint network state of frequency spectrum perception obtains and realize radio communication; Than based on the existing method that network state is obtained; The present invention does not need periodically to stop current communication, has reduced the propagation delay time of cognitive user significantly.
Description of drawings
Fig. 1 is a net like cognition network topological structure sketch map; Fig. 2 is the schematic flow sheet of method of the present invention.
Embodiment
Embodiment one, combine Fig. 2 that this embodiment is described, the wireless communications method that obtains based on the joint network state of the transmission of cognitive user signaling and frequency spectrum perception in the cognition wireless network, it is realized by following steps:
The network state of stn mode perception cognition wireless network is adopted in step 1, cognitive base station, obtains the network state result under the stn mode;
Whether there is authorized user to occur among the network state result that step 2, cognitive base station determining step one obtain, if judged result is then returned execution in step one for not; If judged result is for being that then execution in step three;
Whether the authorized user described in step 3, the cognitive base station determining step two appears on the idle frequency spectrum of cognition wireless network, if judged result is for being that then execution in step 31; If judged result is that then execution in step four;
All cognitive user in the cognition wireless network are given with the information broadcast that authorized user occurs in step 3 one, cognitive base station;
Cognitive user in step 4, the cognition wireless network is selected in the window to keep out of the way number in keeping out of the way of back off algorithm at random, and several the sending into of keeping out of the way that will select kept out of the way timer;
Whether step 5, cognitive base station judges signaling channel be occupied, if judged result is for being, and execution in step May Day then; If judged result is that then execution in step six;
Step May Day, keep out of the way timer and stop timing, and return execution in step five;
Step 6, the timing number of keeping out of the way timer subtract one, and judge whether the said timing number of keeping out of the way makes zero, if judged result is then returned execution in step five for not; If judged result is for being that then execution in step seven;
Whether step 7, cognitive base station judges signaling channel have conflict, if judged result is for being that then execution in step eight; If judged result is not for, transmission success is then accomplished the radio communication of cognitive base station and cognitive user in the cognition wireless network;
Step 8, cognitive base station judges are kept out of the way window and whether are arrived maximum, if judged result for not, execution in step Aug. 1st then; If judged result is for being that then execution in step nine;
Step Aug. 1st, cognitive base station will be kept out of the way window and enlarged one times, and return execution in step four;
The network state of SSM pattern perception cognition wireless network is adopted in step 9, cognitive base station, obtains the network state result under the SSM pattern, and experience Dt time of delay; Said time of delay, the scope of Dt was 30 seconds～60 seconds;
Step 10, cognitive base station are detected among the network state result who obtains in the step 9, and whether the frequency of occurrences of authorized user is less than threshold value F, if judged result is then returned execution in step nine for not; If judged result is for being that then execution in step 11; The scope of said threshold value F is 0.4 time/second～0.6 time/second;
A perception is carried out to all channels in step 11, cognitive base station, and according to sensing results registration updating table, and the registration table after will upgrading is broadcast to all cognitive user in the cognition wireless network, and returns execution in step one.
The implication of the stn mode in the step 1 is: be utilized in cognitive user behavioural information and the frequency spectrum perception transmitted on the signaling channel and unite the method that channel status is obtained.
The implication of the SSM pattern in the step 9 is: the method for utilizing frequency spectrum perception that channel status is obtained.
Back off algorithm in the step 4 is specially: when N user is ready for sending request simultaneously; This N user need select one to keep out of the way number and deposit in and keep out of the way timer in keeping out of the way window randomly; After keeping out of the way timer and making zero, the user could use the concurrent carry information of channel; Wait for the user and to keep out of the way in the time period that timer makes zero, when the user has used current channel, need time-out clock, till channel idle; After once sending the competition failure, then keep out of the way window and enlarge one times, after sending successfully, recover the original window size; When the competition failure expands as 2 until keeping out of the way window
mDuring W, then system switches to the SSM pattern, and wherein W is a minimum competition window, and m is maximum competition number of times.
The present invention proposes a kind of cognitive user under the situation of heterogeneous networks throughput, the method that the network state of using the transmission of control signaling on control channel and frequency spectrum perception to unite is obtained.The present invention is on the basis of frequency spectrum perception; The associating cognitive user is utilized the control channel signaling to transmit and is obtained network state; Simultaneously for fear of the bump generation of incident of signaling control channel; The present invention has introduced back off algorithm, and decides the handoff threshold of single frequency spectrum perception and two kinds of patterns of joint spectrum perception through the size that window is kept out of the way in setting.
The present invention is applicable to the net like cognition network; In the said net like cognition network; Be divided into a plurality of local networks according to the geographical position; Each local network all has a cognitive base station, and local network comprises some cognitive user and all within its communication coverage, following some requirement must be satisfied in cognitive base station: (1) can utilize control channel and all cognitive user to communicate; (2) can insert in other the local cognition network.(3) can carry out perception to all frequency spectrums of present networks.Each local cognition network utilizes separately that center base station can insert with other local cognition network, and which local cognition network is cognitive user confirm to insert according to own current geographical position.Wherein, the signaling channel of frequency is separately all arranged in each local network, and a signaling channel is arranged between each network, their frequency is independently.Secondly, be that each cognitive user is distributed a registration table, registration table has comprised the all-network information of cognitive user needs, and when network state changes, promptly authorized user appears at or leaves certain channel; Cognitive user appears at or leaves certain channel, and at this moment, cognitive user need be upgraded the registration table of oneself, and cognitive user need be informed other cognitive user with factum simultaneously, and other cognitive user need the upgrading registration table after the information of receiving.Specifically comprise the following aspects: the numbering of (1) current local network.Each centralized network all has a numbering, when cognitive user moves in other networks, need change network numbering.(2) frequency parameter of control channel.The employed control channel of each network maybe be different, so when cognitive user moves in other networks, need to obtain the channel parameter of current network.(3) channel list.Cognitive user need obtain all operable channels of current network, comprises the channel that cognitive user or authorized user are using.(4) channel status.Corresponding each channel need provide current channel status, comprises whether cognitive user or authorized user are arranged on this channel.(5) authorization user information.Corresponding each channel need be learnt the information of authorized user, comprises the time that last time of authorized user is left, and the history of authorized user is used information.When network state changes, promptly authorized user appears at or leaves certain channel; Cognitive user appears at or leaves certain channel, and at this moment, cognitive user need be upgraded the registration table of oneself, and cognitive user need be informed other cognitive user with factum simultaneously, and other cognitive user need the upgrading registration table after the information of receiving.
After distributing registration table, need provide flow through a network from two aspects:
One. new user-network access authentication.New user needs to select to insert which network according to the positional information of oneself, and inserts cognitive base station through common signal channel.
New user-network access authenticating step is following:
The first step: cognitive user utilizes GPS to confirm the geographical position of oneself, and on common signal channel, broadcasts the geographical location information of oneself, is replied by nearest cognitive base station, and provides the common signal channel frequency parameter of own local network.
Second step: cognitive user proposes the networking request to replying the base station.
The 3rd step: registration table is distributed to the user who files an application in cognitive base station, and channel of preassignment uses to it, informs other users in the net simultaneously.
The 4th step: other cognitive user registration updating tables network successfully.
Two. the cognitive user channel switches.Each cognitive user needs periodically own current channel to be carried out perception, when authorized user occurs, can selective channel switch; When perhaps cognitive user finds to have better channel (channel long), also can carry out channel and switch like available duration via.Cognitive user switches to destination channel, passes through signaling channel simultaneously with the cognitive base station of this information notification, and each cognitive user is informed with the form of broadcasting again in the base station, and cognitive user is the registration updating table after receiving information.
The present invention is under the SSM pattern, and the frequency that current authorized user occurs need be analyzed in cognitive base station, to select when to switch back stn mode.At first, cognitive base station postpones a period of time Dt, and sets a threshold value F; After time of delay, Dt finished; Begin to add up the authorized user frequency of occurrences; When a period of time Vt authorized user occurrence number M satisfies
, then select to switch back in the STM channel acquisition mode, otherwise continue to use the SSM pattern to carry out perception; Wherein time of delay Dt; Threshold value F investigates time Vt according to setting according to user's actual conditions, and the present invention provides reference value: Dt got 30～60 seconds; Threshold value F gets 0.4～0.6 time/second, investigates time Vt and gets 5～10 seconds.But, before switching, need to accomplish a registration table and upgrade.Single pass need be carried out to current all frequency spectrums in cognitive base station, obtaining current network state, and up-to-date registration table is informed each cognitive user with the form of broadcasting, the registration table of cognitive user renewal oneself.
Claims (4)
1. the wireless communications method that obtains based on the joint network state of cognitive user signaling transmission and frequency spectrum perception in the cognition wireless network, it is characterized in that: it is realized by following steps:
The network state of stn mode perception cognition wireless network is adopted in step 1, cognitive base station, obtains the network state result under the stn mode;
Whether there is authorized user to occur among the network state result that step 2, cognitive base station determining step one obtain, if judged result is then returned execution in step one for not; If judged result is for being that then execution in step three;
Whether the authorized user described in step 3, the cognitive base station determining step two appears on the idle frequency spectrum of cognition wireless network, if judged result is for being that then execution in step 31; If judged result is that then execution in step four;
All cognitive user in the cognition wireless network are given with the information broadcast that authorized user occurs in step 3 one, cognitive base station;
Cognitive user in step 4, the cognition wireless network is selected in the window to keep out of the way number in keeping out of the way of back off algorithm at random, and several the sending into of keeping out of the way that will select kept out of the way timer;
Whether step 5, cognitive base station judges signaling channel be occupied, if judged result is for being, and execution in step May Day then; If judged result is that then execution in step six;
Step May Day, keep out of the way timer and stop timing, and return execution in step five;
Step 6, the timing number of keeping out of the way timer subtract one, and judge whether the said timing number of keeping out of the way makes zero, if judged result is then returned execution in step five for not; If judged result is for being that then execution in step seven;
Whether step 7, cognitive base station judges signaling channel have conflict, if judged result is for being that then execution in step eight; If judged result is not for, transmission success is then accomplished the radio communication of cognitive base station and cognitive user in the cognition wireless network;
Step 8, cognitive base station judges are kept out of the way window and whether are arrived maximum, if judged result for not, execution in step Aug. 1st then; If judged result is for being that then execution in step nine;
Step Aug. 1st, cognitive base station will be kept out of the way window and enlarged one times, and return execution in step four;
The network state of SSM pattern perception cognition wireless network is adopted in step 9, cognitive base station, obtains the network state result under the SSM pattern, and experience Dt time of delay; Said time of delay, the scope of Dt was 30 seconds～60 seconds;
Step 10, cognitive base station are detected among the network state result who obtains in the step 9, and whether the frequency of occurrences of authorized user is less than threshold value F, if judged result is then returned execution in step nine for not; If judged result is for being that then execution in step 11; The scope of said threshold value F is 0.4 time/second～0.6 time/second;
A perception is carried out to all channels in step 11, cognitive base station, and according to sensing results registration updating table, and the registration table after will upgrading is broadcast to all cognitive user in the cognition wireless network, and returns execution in step one.
2. the wireless communications method that obtains based on the joint network state of cognitive user signaling transmission and frequency spectrum perception in the cognition wireless network according to claim 1 is characterized in that the implication of the stn mode in the step 1 is: be utilized in cognitive user behavioural information and the frequency spectrum perception transmitted on the signaling channel and unite the method that channel status is obtained.
3. the wireless communications method that obtains based on the joint network state of cognitive user signaling transmission and frequency spectrum perception in the cognition wireless network according to claim 1 is characterized in that the implication of the SSM pattern in the step 9 is: the method for utilizing frequency spectrum perception that channel status is obtained.
4. the wireless communications method that obtains based on the joint network state of cognitive user signaling transmission and frequency spectrum perception in the cognition wireless network according to claim 1; It is characterized in that the back off algorithm in the step 4 is specially: when N user is ready for sending request simultaneously; This N user need select one to keep out of the way number and deposit in and keep out of the way timer in keeping out of the way window randomly; After keeping out of the way timer and making zero, the user could use the concurrent carry information of channel; Wait for the user and to keep out of the way in the time period that timer makes zero, when the user has used current channel, need time-out clock, till channel idle; After once sending the competition failure, then keep out of the way window and enlarge one times, after sending successfully, recover the original window size; When the competition failure expands as 2 until keeping out of the way window
mDuring W, then system switches to the SSM pattern, and wherein W is a minimum competition window, and m is maximum competition number of times.
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