CN104159248A - Method for improving performance of cognition wireless network - Google Patents
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Abstract
The invention relates to a method for improving performance of a cognition wireless network, and belongs to the field of cognition wireless systems. The method comprises the following steps: firstly, according to the cognition wireless network owning Np main users and Ns secondary users, establishing channel allocation frames to obtain an allocation frame matrix; then parallelly perceiving channels according to number sequences, of Np channels to be detected, assigned through the channel allocation frame matrix by each secondary user; then calculating the throughput of each secondary user according to the column where an idle channel detected in the first time in a detection period is located by each secondary user; finally calculating the total throughput of the cognition wireless network according to the throughput obtained by each secondary user. According to the method, the throughput of the network is improved; the condition that more secondary users have the chance of transmission is further ensured, that is the performance of the network is further improved.
Description
Technical field
A kind of performance boost method that the present invention relates to cognition wireless network, belongs to cognitive radio system field.
Background technology
We know, radio spectrum resources is distributed unitedly by government.Along with the informationization gradually of society, the develop rapidly of wireless communication technology, it is more and more nervous that frequency spectrum resource becomes; And on the other hand, distributed the average utilization of frequency spectrum lower in a large number at present, space has greatly improved.In order to improve the utilance of frequency spectrum resource, cognitive radio technology is suggested.
In the cognitive radio technology having existed at present, there are various trials and method to promote the performance of cognitive radio, for example, at strengthening frequency spectrum perception technical elements, in order to improve frequency spectrum detection efficiency, propose many different cooperative frequency spectrum sensing methods; On the allotment ratio in detection time and transmission time, carry out deep probe into etc.But they exist a common shortcoming is exactly that each secondary user's is to only have the secondary user's of a receiver, in the time that secondary user's perceives available channel, starts take and transmit, and no longer comprehends the duty situation of subsequent channel.And the present invention is just in order to make up this shortcoming, having proposed a kind of cognition wireless network parallel frequency spectrum monitors and distribution method, whether wherein setting each secondary user's is the secondary user's of many (two) receiver, can also monitor the situation that takies of other channels in the time of communication, detect and can use.With respect to the situation of single-receiver, advantage of the present invention is: when secondary user's has found transmission channel and transmitted, can utilize idle receiver still subsequent channel to be kept monitoring, and finding to switch to this available channel when next available channel, and the channel of current use is discharged, leave other secondary user's for, be so constantly cycled to repeat.Can make so more secondary user's can find available channel and the chance of transmission.The repeatedly frequency spectrum of the secondary user's by multi-receiver switches the throughput of carrying out larger lifting wireless network, and then promotes the performance of cognition wireless network, finally reaches the object that improves the availability of frequency spectrum.
Summary of the invention
Technical problem to be solved by this invention is how to allow more secondary user's find the problem of available channel and transmission opportunity, and a kind of performance boost method of cognition wireless network is provided.
Technical scheme of the present invention is: a kind of performance boost method of cognition wireless network, first set up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, and obtain distributing frame matrix; Then each secondary user's is according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently; Follow each secondary user's detects for the first time the each secondary user's of column count at idle channel place in sense cycle throughput according to it; The total throughout of the throughput calculation cognition wireless network finally obtaining according to each secondary user's.
The concrete steps of described method are as follows:
Step1, structure channel allocation frame matrix:
Set up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, every row of channel allocation frame is made up of Np element, has expressed the channel number to be checked that respectively lists assignment; For each secondary user's is divided a line, they independently go respectively to go Monitor detection whether to have available channel according to the channel number sequence to be detected of assignment; Build the capable Np row of Ns channel allocation frame matrix with this
; Wherein
s i,jfor channel number, i=1 ... Ns, j=1 ... Np;
Step2, parallel frequency spectrum are monitored and are distributed:
Each secondary user's, according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently, is so constantly monitored the channel number shown in a row element in matrix line by line backward, until the end in whole perception cycle:
If find first channel busy, the secondary user's that transmission opportunity do not detected continues the situation that takies of removing the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment, and take in the time finding that there is idle channel, if do not find all the time available channel within a perception cycle, finish;
If found idle channel, the secondary user's of transmitting then utilizes idle receiver to go the situation that takies of the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment: if find next available channel in the monitoring in subsequent column, switch to this channel, and discharge the channel of current use, to vacate to other secondary user's, this process constantly repeats until the end in whole perception cycle; If available channel again do not detected, keep transmission until the end in whole perception cycle;
Whether Step3, each secondary user's detect idle channel calculate throughput in a sense cycle according to it:
If secondary user's detects idle channel, secondary user's is according to the throughput that the each secondary user's of column count at idle channel place detected for the first time
b n ;
If secondary user's does not detect idle channel, throughput is zero;
The total throughout of Step4, calculating cognition wireless network:
The throughput calculation total throughout obtaining according to each secondary user's in step Step3
; Wherein,
nwhat represent is the
nsecondary user's.
Described throughput
b n computing formula be:
In formula,
nwhat represent is the
nsecondary user's,
rrepresent the transmission rate of secondary user's,
kthe row at place while idle channel being detected for the first time for secondary user's,
tfor detecting period,
tfor the perception cycle.
Operation principle of the present invention is:
Step 01) model system model:
Suppose that a system is a time slot cognitive radio networks that has Np main users and Ns secondary user's.Set up channel allocation frame according to number of network users, every row of channel allocation frame is made up of Np element, express the channel number sequence to be checked that respectively lists assignment, for each secondary user's is divided a line, they independently go respectively to go Monitor detection whether to have available channel according to the channel number sequence to be detected of assignment.Therefore channel allocation frame is the matrix that the capable Np of a Ns is listed as.
Step 02) main users and all secondary user's be synchronous on time slot.In the beginning of each row (being time slot), a channel is confirmed to be busy or idle.For each secondary user's, each time slot comprises two stages: perception stage and transmit stage.The process of sensing each row start be performed.Suppose that all secondary user's are provided with two simple receivers that transmit herein, therefore they can also utilize the situation that takies of idle other channels of another one receiver perception when with a receiver transmission.Each secondary user's is removed channel perception by the channel number sequence to be detected of specifying,, secondary user's is (channel number shown in the element of this secondary user's first row of being expert at) first channel of perception from the top for its predefined sensing sequence, then, if find first channel busy, second channel of perception (channel number shown in the element of this secondary user's secondary series of being expert at), so constantly carries out perception to channel in respective column backward according to assignment sequence to be detected.This process will last till the end of one-period.
Step 03) secondary user's is taking in certain channel the process transmitted, if find next available channel in the time that subsequent column is carried out Monitor detection to assignment channel sequence to be detected, secondary user's temporarily stops transmission, discharge the channel taking, and switch to new channel and transmit, carry out frequency spectrum switching.Because the time compole that frequency spectrum switches is short, ignore herein, and define each detecting period and be
t, each user's transmission rate is all mutually
r, find for the first time idle channel perception to the in secondary user's according to the sensing sequence of assignment
kwhen row, in perception before occupied in sensing sequence
kafter-1 row, known time slot efficiency
e k for:
And each secondary user's detects for the first time the row at idle channel place in a sense cycle according to it
kcalculate the throughput of each secondary user's
b n :
In formula,
nwhat represent is the
nsecondary user's,
rrepresent the transmission rate of secondary user's,
kthe row at place while idle channel being detected for the first time for secondary user's,
tfor detecting period,
tfor the perception cycle.
Step 04) want to make throughput as far as possible large, need to make secondary user's to find as early as possible transmission opportunity, detecting period is as far as possible short, and the transmission time is as far as possible long.Found by analog simulation test, the former row in channel allocation frame are large to throughput contribution, and in row below, repeat element can get more and more, and is almost inactive channel.Therefore by all available channel Random assignments in former row, can obtain preferably channel allocation frame, the throughput of network is improved, performance is promoted.
Step 05) obtaining on the basis of more excellent channel allocation frame, give full play to the effect of secondary user's multi-receiver, that is: all secondary user's go Monitor detection whether to have available channel in the channel number sequence to be detected according to assignment, the secondary user's that transmission opportunity do not detected continues to go to monitor in respective column according to assignment channel sequence to be detected the situation that takies of corresponding assignment channel to be detected, and take in the time finding that there is idle channel, if do not find all the time available channel in one-period, finish; Find idle channel and utilized idle receiver still subsequent assignment channel to be detected to be kept monitoring in the secondary user's of transmission, if find next available channel in subsequent column is monitored, switch to this channel, and discharge the channel of current use, to vacate to other secondary user's, this process constantly repeats until the end in whole cycle; If available channel again do not detected, keep transmission until the end in whole cycle.
The invention has the beneficial effects as follows:
1, set up channel allocation frame according to primary user and this number of users, and by idle channel Random assignment at former row, so optimized channel allocation mechanism, avoided collision after cause disabled situation, improved the throughput of network.
2, each secondary user's is the secondary user's of multi-receiver, in communication, monitor the situation that takies of other channels, detect and whether can use: as found first in the process of available channel transmission in the secondary user's of transmission, continue to utilize the availability of idle receiver perception subsequent channel, if found, available channel switches, and front nonrecoverable channel is vacated to other secondary user's; So further ensure that more times grade of user has the chance of transmission, further promoted the performance of network.
Brief description of the drawings
Fig. 1 is algorithm flow chart of the present invention;
Fig. 2 is secondary user's parallel frequency spectrum perception schematic diagram in one-period in the present invention.
Embodiment
Embodiment 1: as shown in Figure 1-2, a kind of performance boost method of cognition wireless network, first sets up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, obtains distributing frame matrix; Then each secondary user's is according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently; Follow each secondary user's detects for the first time the each secondary user's of column count at idle channel place in sense cycle throughput according to it; The total throughout of the throughput calculation cognition wireless network finally obtaining according to each secondary user's.
The concrete steps of described method are as follows:
Step1, structure channel allocation frame matrix:
Set up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, every row of channel allocation frame is made up of Np element, has expressed the channel number to be checked that respectively lists assignment; For each secondary user's is divided a line, they independently go respectively to go Monitor detection whether to have available channel according to the channel number sequence to be detected of assignment; Build the capable Np row of Ns channel allocation frame matrix with this
; Wherein
s i,jfor channel number, i=1 ... Ns, j=1 ... Np;
Step2, parallel frequency spectrum are monitored and are distributed:
Each secondary user's, according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently, is so constantly monitored the channel number shown in a row element in matrix line by line backward, until the end in whole perception cycle:
If find first channel busy, the secondary user's that transmission opportunity do not detected continues the situation that takies of removing the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment, and take in the time finding that there is idle channel, if do not find all the time available channel within a perception cycle, finish;
If found idle channel, the secondary user's of transmitting then utilizes idle receiver to go the situation that takies of the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment: if find next available channel in the monitoring in subsequent column, switch to this channel, and discharge the channel of current use, to vacate to other secondary user's, this process constantly repeats until the end in whole perception cycle; If available channel again do not detected, keep transmission until the end in whole perception cycle;
Whether Step3, each secondary user's detect idle channel calculate throughput in a sense cycle according to it:
If secondary user's detects idle channel, secondary user's is according to the throughput that the each secondary user's of column count at idle channel place detected for the first time
b n ;
If secondary user's does not detect idle channel, throughput is zero;
The total throughout of Step4, calculating cognition wireless network:
The throughput calculation total throughout obtaining according to each secondary user's in step Step3
; Wherein,
nwhat represent is the
nsecondary user's.
Described throughput
b n computing formula be:
In formula,
nwhat represent is the
nsecondary user's,
rrepresent the transmission rate of secondary user's,
kthe row at place while idle channel being detected for the first time for secondary user's,
tfor detecting period,
tfor the perception cycle.
Embodiment 2: as shown in Figure 1-2, a kind of performance boost method of cognition wireless network, first sets up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, obtains distributing frame matrix; Then each secondary user's is according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently; Follow each secondary user's detects for the first time the each secondary user's of column count at idle channel place in sense cycle throughput according to it; The total throughout of the throughput calculation cognition wireless network finally obtaining according to each secondary user's.
The concrete steps of described method are as follows:
Step1, structure channel allocation frame matrix:
Set up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, every row of channel allocation frame is made up of Np element, has expressed the channel number to be checked that respectively lists assignment; For each secondary user's is divided a line, they independently go respectively to go Monitor detection whether to have available channel according to the channel number sequence to be detected of assignment; Build the capable Np row of Ns channel allocation frame matrix with this
; Wherein
s i,jfor channel number, i=1 ... Ns, j=1 ... Np;
Design parameter design is as follows: 4 primary users, and 4 secondary user's, build 4 row 4 row channel allocation frame matrixs:
;
r=100bit/s,
t=10s,
t=1s;
Step2, parallel frequency spectrum are monitored and are distributed:
Each secondary user's, according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently, is so constantly monitored the channel number shown in a row element in matrix line by line backward, until the end in whole perception cycle:
If find first channel busy, the secondary user's that transmission opportunity do not detected continues the situation that takies of removing the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment, and take in the time finding that there is idle channel, if do not find all the time available channel within a perception cycle, finish;
If found idle channel, the secondary user's of transmitting then utilizes idle receiver to go the situation that takies of the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment: if find next available channel in the monitoring in subsequent column, switch to this channel, and discharge the channel of current use, to vacate to other secondary user's, this process constantly repeats until the end in whole perception cycle; If available channel again do not detected, keep transmission until the end in whole perception cycle;
Be specially: in first row, secondary user's is from being first channel of top perception (first, second, third and fourth secondary user's is perception No. 4, No. 1, No. 3 and No. 4 channels respectively) of its predefined sensing sequence, then, if find first channel busy, second channel of perception (first, second, third and fourth secondary user's is perception No. 1, No. 4, No. 2 and No. 1 channel respectively), so continuous one Monitor detection being backward listed as, this process will last till the end (being that in matrix, the channel number shown in a row element has all detected) of one-period.
In first row, second subprime user and for the third time a level user find respectively No. 1 and No. 3 channels can be used, and take and start to transmit, and due to first and the 4th secondary user's detect No. 4 channels simultaneously and bump, therefore could not find transmission opportunity, and No. 4 channels keep idle.
In secondary series, a level user finds that No. 2 channels can use for the third time, switches to this channel, and the free time go out channel No. 3, in like manner second subprime user finds that No. 4 channels can use, and switch to this channel, and the free time goes out 1 channel; In addition, the first secondary user's and the 4th secondary user's now bump at No. 1 channel, cannot take.
In the 3rd row, the first secondary user's and the 4th secondary user's No. 1 channel of discovery and No. 3 channels can be used, and the first secondary user's starts at No. 1 transmission, and the 4th secondary user's starts at No. 3 transmissions; In addition, second subprime user finds that No. 2 channels are occupied, therefore continue at No. 4 transmissions, in like manner, level user finds that No. 4 channels are occupied for the third time, therefore continue at No. 2 transmissions.So, in the 3rd row, four secondary user's have just all found the channel that can take and transmit, the follow-up idle channel that do not have simultaneously, the idle receiver that is secondary user's cannot find available channel again, and the situation of the channel that can not switch again continues to whole end cycle so always.
The throughput of each secondary user's in Step3, calculating cognition wireless network:
Whether each secondary user's detects idle channel calculate throughput in a sense cycle according to it:
If secondary user's detects idle channel, secondary user's is according to the throughput that the each secondary user's of column count at idle channel place detected for the first time
b n ;
If secondary user's does not detect idle channel, throughput is zero;
The throughput of the first secondary user's:
; Wherein, when the first secondary user's detects idle channel for the first time, place classifies 3 as;
Second subprime user's throughput:
; Wherein, when second subprime user detects idle channel for the first time, place classifies 1 as;
Level user's throughput for the third time:
; Wherein, when level user detects idle channel for the first time for the third time, place classifies 1 as;
The throughput of the 4th secondary user's:
; Wherein, when the 4th secondary user's detects idle channel for the first time, place classifies 3 as;
The total throughout of Step4, calculating cognition wireless network:
The throughput calculation total throughout obtaining according to each secondary user's in step Step3
; Wherein,
nwhat represent is the
nsecondary user's.
Be specially:
.
In addition, if do not use method of the present invention, only have second subprime user and for the third time a level user find respectively No. 1 and No. 3 channels can be used, and take and start to transmit.In subsequent column, because No. 1 channel and No. 3 channels are respectively by second subprime user and level CU for the third time, so the first secondary user's and the 4th secondary user's all fail to find available channel in the whole cycle, and cannot transmit, throughput is zero thus.
Now the throughput of each secondary user's of this cognitive radio system is:
The throughput of the first secondary user's:
;
Second subprime user's throughput:
;
Level user's throughput for the third time:
;
The throughput of the 4th secondary user's:
;
Therefore total throughout is:
.
Contrast the total throughout of this cognitive radio system under above-mentioned two kinds of different situations, can significantly find:
, use cognition wireless network parallel frequency spectrum to monitor and distribution method, can significantly improve the throughput of cognition wireless network, and then promote the performance of cognition wireless network, finally improve the availability of frequency spectrum.
By reference to the accompanying drawings the specific embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned execution mode, in the ken possessing those of ordinary skill in the art, can also under the prerequisite that does not depart from aim of the present invention, make various variations.
Claims (3)
1. a performance boost method for cognition wireless network, is characterized in that: first set up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, obtain distributing frame matrix; Then each secondary user's is according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently; Follow each secondary user's detects for the first time the each secondary user's of column count at idle channel place in sense cycle throughput according to it; The total throughout of the throughput calculation cognition wireless network finally obtaining according to each secondary user's.
2. the performance boost method of cognition wireless network according to claim 1, is characterized in that: the concrete steps of described method are as follows:
Step1, structure channel allocation frame matrix:
Set up channel allocation frame according to a cognitive radio networks that has Np main users and Ns secondary user's, every row of channel allocation frame is made up of Np element, has expressed the channel number to be checked that respectively lists assignment; For each secondary user's is divided a line, they independently go respectively to go Monitor detection whether to have available channel according to the channel number sequence to be detected of assignment; Build the capable Np row of Ns channel allocation frame matrix with this
; Wherein
s i,jfor channel number, i=1 ... Ns, j=1 ... Np;
Step2, parallel frequency spectrum are monitored and are distributed:
Each secondary user's, according to the Np of channel allocation frame matrix assignment channel number sequence to be detected channel perception concurrently, is so constantly monitored the channel number shown in a row element in matrix line by line backward, until the end in whole perception cycle:
If find first channel busy, the secondary user's that transmission opportunity do not detected continues the situation that takies of removing the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment, and take in the time finding that there is idle channel, if do not find all the time available channel within a perception cycle, finish;
If found idle channel, the secondary user's of transmitting then utilizes idle receiver to go the situation that takies of the channel to be detected of monitoring corresponding assignment in respective column according to the channel number sequence to be detected of assignment: if find next available channel in the monitoring in subsequent column, switch to this channel, and discharge the channel of current use, to vacate to other secondary user's, this process constantly repeats until the end in whole perception cycle; If available channel again do not detected, keep transmission until the end in whole perception cycle;
The throughput of each secondary user's in Step3, calculating cognition wireless network:
Whether each secondary user's detects idle channel calculate throughput in a sense cycle according to it:
If secondary user's detects idle channel, secondary user's is according to the throughput that the each secondary user's of column count at idle channel place detected for the first time
b n ;
If secondary user's does not detect idle channel, throughput is zero;
The total throughout of Step4, calculating cognition wireless network:
The throughput calculation total throughout obtaining according to each secondary user's in step Step3
; Wherein,
nwhat represent is the
nsecondary user's.
3. the performance boost method of cognition wireless network according to claim 2, is characterized in that: described throughput
b n computing formula be:
In formula,
nwhat represent is the
nsecondary user's,
rrepresent the transmission rate of secondary user's,
kthe row at place while idle channel being detected for the first time for secondary user's,
tfor detecting period,
tfor the perception cycle.
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