CN102647721B - Method for aggregating static spectrums in cognitive radio - Google Patents
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- CN102647721B CN102647721B CN201210148019.1A CN201210148019A CN102647721B CN 102647721 B CN102647721 B CN 102647721B CN 201210148019 A CN201210148019 A CN 201210148019A CN 102647721 B CN102647721 B CN 102647721B
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- 230000001149 cognitive effect Effects 0.000 title claims abstract description 75
- 238000001228 spectrum Methods 0.000 title claims abstract description 33
- 230000003068 static effect Effects 0.000 title claims abstract description 25
- 230000004931 aggregating effect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000006116 polymerization reaction Methods 0.000 claims description 31
- 230000002776 aggregation Effects 0.000 claims description 15
- 238000004220 aggregation Methods 0.000 claims description 15
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Abstract
The invention discloses a method for aggregating static spectrums in a cognitive radio and belongs to the field of radio. The method aims to solve the problems that few cognitive users access a channel and the utilization ratio of discontinuous idle frequency bands is low in the existing cognitive radio technology. The method provides services for the plurality of cognitive users by utilizing scattered idle frequency bands when a main user does not occupy the channel. Since the bandwidth of single scattered idle frequency band cannot meet the needed bandwidth of the cognitive users, in one span, the plurality of idle frequency bands are accumulated and aggregated. When meeting the needed bandwidth of the cognitive users, the aggregated frequency bands are distributed to the users for use so as to achieve that more cognitive users access the channel and the utilization ratio of the spectrums is improved. The method disclosed by the invention has the advantages that in one span, the transmission service is provided for one cognitive user by utilizing at least two or more idle frequency bands. More cognitive users access the channel without interference with the use of the main user.
Description
Technical field
The present invention relates to the method for static spectrum aggregating in a kind of cognitive radio, belong to radio field.
Background technology
Radio-frequency spectrum is a kind of very valuable and very limited resource.Human development is to today, and most of Radio Spectrum Resource has been assigned with totally, and remaining available frequency band is very few, allows to be used by people, and technical difficulty is also very large, so cognitive radio arises at the historic moment.Cognitive radio technology can be in existing, authorized frequency range, the frequency range that in short time, not authorized user (primary user) takies is offered to cognitive user to be used, so both guarantee the communication resource that authorized user and cognitive user are required, do not wasted as much as possible again these communication resources.Therefore cognitive radio technology will play an important role in future wireless system field.
Spectrum aggregating technology be U.K. Ministry of Defence in 2006 directly under Nai Kuidike military products company propose, its purport is idle frequency range and the discontinuous frequency range that will make full use of uncommitted CU in undelegated discontinuous, scattered radio-frequency spectrum fragment or cognitive radio.Technique can be widely used in LTE or cognition wireless electrical domain, and how, discontinuous frequency spectrum scattered in order to solve distributes and use problem.Static spectrum aggregating in the present invention refers to does not consider the impact of time factor on channel, once the distribution of primary user and idle frequency range is determined, does not just change along with the variation of time, remains identical distribution situation.
One of technical standard that orthogonal frequency division multiplexi OFDM (Orthogonal Frequency Division Multiplexing) uses as LTE and following 4G, its main thought is that channel is divided into some subchannels, convert high-speed data signal to parallel low speed sub data flow, be modulated on every sub-channels and transmit.And cognitive radio uses NC-OFDM (Non-contiguous OFDM, the discontinuous OFDM of subcarrier) as one of technical standard.NC-OFDM arranges mainly for discontinuous subcarrier or subchannel, and the difference of itself and OFDM is optionally to close subcarrier.Specifically, the cognitive user NC-OFDM signal of launching, according to current channel conditions, is closed the corresponding subcarrier that occurs primary user on subchannel, and continues to use remaining subcarrier to transmit, thereby avoids the interference to primary user.
Because the feature of NC-OFDM is to utilize subcarrier transmission data, therefore the bandwidth of each subcarrier is the width equating and will determine as the case may be subcarrier.NC-OFDM subcarrier bandwidth can be decided to be to xMHz.There is following formula:
XMHz × idle frequency range number of sub carrier wave=idle band bandwidth (1)
XMHz × primary user number of sub carrier wave=primary user bandwidth (2)
Due to the condition restriction of hardware device, can discontinuous idle frequency range by real polymerization, also needs to judge by this concept of span, and it is used for weighing the ability of spectrum aggregating.Maximum bandwidth when span refers to hardware device transmission data or the low-limit frequency using in the time of transmission data and the distance of highest frequency.Span is larger, and on one section of frequency spectrum, polymerisable idle frequency range is more, and two idle frequency range distances that are aggregated can be far away.
Existing cognitive radio technology, the cognitive user of access channel is few, and discontinuous idle frequency range utilance is low.
Summary of the invention
The present invention seeks in order to solve existing cognitive radio technology, the cognitive user of access channel is few, and the low problem of discontinuous idle frequency range utilance provides the method for static spectrum aggregating in a kind of cognitive radio.
The method of static spectrum aggregating in a kind of cognitive radio of the present invention: the idle frequency range in radio static frequency spectrum is carried out to polymerization, distribute to cognitive user, when initial, the left margin of span is placed in to the left margin of described radio static frequency spectrum,
In described cognitive radio, the method for static spectrum aggregating comprises the following steps:
Step 1, by the ascending arrangement of N the required bandwidth of cognitive user, form N the required bandwidth aggregation B={B of cognitive user
1, B
2, B
3..., B
k..., B
n, wherein B
kbe k the required bandwidth of cognitive user k, k=1,2,3 ... N, N is more than or equal to 1 natural number;
Step 2, judge the right margin drop point site of span, in described span, V+1 idle frequency range is for cognitive user altogether, and described V+1 idle frequency range pressed the order arrangement from low frequency to high frequency, forms idle frequency range set
wherein [f
li, f
ui] represent i idle frequency range, f
libe the low frequency edge of i idle frequency range, f
uibe the high frequency border of i idle frequency range, V is more than or equal to 1 natural number, if the right margin of span falls within
perform step three; If the right margin of span falls within
right side, perform step five;
Step 3, last the idle frequency range of this span of removing
then perform step four,
Step 4, remaining this span V idle frequency range is calculated in order successively before the summation of n+1 idle band bandwidth polymerization
thereby obtain idle band bandwidth polymerization set M={M
1, M
2, M
3..., M
n... M
v-1, n=1,2,3 ... V-1,
Wherein m
irepresent i idle frequency range [f in this span
li, f
ui] bandwidth, i=1,2,3 ... V, then performs step six;
Step 5, the V+1 of this span idle frequency range is calculated in order successively before the summation of n+1 idle band bandwidth polymerization
thereby obtain idle band bandwidth polymerization set M={M
1, M
2, M
3..., M
n... M
v, n=1,2,3 ... V,
Wherein m
irepresent i idle frequency range [f in this span
li, f
ui] bandwidth, i=1,2,3 ... V+1,
Then perform step six;
Step 6, by the data in idle band bandwidth polymerization set M by from left to right order respectively with N the required bandwidth aggregation B of cognitive user in each B
kloop comparison;
After completely relatively finishing, at M
n>=B
ktime, if there is M
n=B
kthere is execution step seven; At M
n>=B
ktime, if M
n=B
knot there is not execution step nine; Only there is M
n< B
ktime, execution step eight;
Step 7, in this span, by first eligible M
n=B
kpolymerized frequency band M
ndistribute to k cognitive user, in N the required bandwidth aggregation B of cognitive user, idle band bandwidth polymerization set M and idle frequency range set F, used B
k, M
n, [f
li, f
ui] remove, then perform step ten;
Step 8, span is moved right, span left margin is alignd with the left margin of next idle channels; Then return to execution step two;
Step 9, in this span, by idle band bandwidth polymerization set M, first is greater than B
1polymerized frequency band M
ndistribute to k cognitive user, wherein k=arg min{M
n-B
k, k=1,2 ... N, in N the required bandwidth aggregation B of cognitive user, idle band bandwidth polymerization set M and idle frequency range set F, used B
k, M
n, [f
li, f
ui] remove, then perform step ten;
Step 10, span is moved right, span left margin is alignd with the left margin of n+2 idle channels; Then perform step 11;
Step 11, judge whether to meet two conditions simultaneously:
In N the required bandwidth aggregation B of cognitive user, there is unappropriated B
k,
In idle band bandwidth polymerization set M in span after movement, there is M
n,
Be judged as YES execution step two; Be judged as NO, finish, complete static spectrum aggregating process in cognitive radio.
Advantage of the present invention: the method is deposited and utilized in a span at least two or more idle frequency ranges to provide transmission service for a cognitive user.The cognitive user of access channel is many, the not use of interfere with primary users.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method for static spectrum aggregating in a kind of cognitive radio of the present invention;
Fig. 2 is that the span that retains last idle frequency range in cognitive radio when static spectrum aggregating moves schematic diagram, in figure: ■ represents primary user; represents idle frequency range;
represent span;
represent the span after displacement; X represents subcarrier bandwidth, and unit is MHz.
Fig. 3 moves schematic diagram containing the span of abandoning last idle frequency range when static spectrum aggregating in cognitive radio.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 3, a kind of method of static spectrum aggregating in cognitive radio described in present embodiment, idle frequency range in radio static frequency spectrum is carried out to polymerization, distribute to cognitive user, when initial, the left margin of span is placed in to the left margin of described radio static frequency spectrum
In described cognitive radio, the method for static spectrum aggregating comprises the following steps:
Step 1, by the ascending arrangement of N the required bandwidth of cognitive user, form N the required bandwidth aggregation B={B of cognitive user
1, B
2, B
3..., B
k..., B
n, wherein B
kbe k the required bandwidth of cognitive user k, k=1,2,3 ... N, N is more than or equal to 1 natural number;
Step 2, judge the right margin drop point site of span, in described span, V+1 idle frequency range is for cognitive user altogether, and described V+1 idle frequency range pressed the order arrangement from low frequency to high frequency, forms idle frequency range set
wherein [f
li, f
ui] represent i idle frequency range, f
libe the low frequency edge of i idle frequency range, f
uibe the high frequency border of i idle frequency range, V is more than or equal to 1 natural number, if the right margin of span falls within
perform step three; If the right margin of span falls within
right side, perform step five;
Step 3, last the idle frequency range of this span of removing
then perform step four,
Step 4, remaining this span V idle frequency range is calculated in order successively before the summation of n+1 idle band bandwidth polymerization
thereby obtain idle band bandwidth polymerization set M={M
1, M
2, M
3..., M
n... M
v-1, n=1,2,3 ... V-1,
Wherein m
irepresent i idle frequency range [f in this span
li, f
ui] bandwidth, i=1,2,3 ... V, then performs step six;
Step 5, the V+1 of this span idle frequency range is calculated in order successively before the summation of n+1 idle band bandwidth polymerization
thereby obtain idle band bandwidth polymerization set M={M
1, M
2, M
3..., M
n... M
v, n=1,2,3 ... V,
Wherein m
irepresent i idle frequency range [f in this span
li, f
ui] bandwidth, i=1,2,3 ... V+1,
Then perform step six;
Step 6, by the data in idle band bandwidth polymerization set M by from left to right order respectively with N the required bandwidth aggregation B of cognitive user in each B
kloop comparison;
After completely relatively finishing, at M
n>=B
ktime, if there is M
n=B
kthere is execution step seven; At M
n>=B
ktime, if M
n=B
knot there is not execution step nine; Only there is M
n< B
ktime, execution step eight;
Step 7, in this span, by first eligible M
n=B
kpolymerized frequency band M
ndistribute to k cognitive user, in N the required bandwidth aggregation B of cognitive user, idle band bandwidth polymerization set M and idle frequency range set F, used B
k, M
n, [f
li, f
ui] remove, then perform step ten;
Step 8, span is moved right, span left margin is alignd with the left margin of next idle channels; Then return to execution step two;
Step 9, in this span, by idle band bandwidth polymerization set M, first is greater than B
1polymerized frequency band M
ndistribute to k cognitive user, wherein k=arg min{M
n-B
k, k=1,2 ... N, in N the required bandwidth aggregation B of cognitive user, idle band bandwidth polymerization set M and idle frequency range set F, used B
k, M
n, [f
li, f
ui] remove, then perform step ten;
Step 10, span is moved right, span left margin is alignd with the left margin of n+2 idle channels; Then perform step 11;
Step 11, judge whether to meet two conditions simultaneously:
In N the required bandwidth aggregation B of cognitive user, there is unappropriated B
k,
In idle band bandwidth polymerization set M in span after movement, there is M
n,
Be judged as YES execution step two; Be judged as NO, finish, complete static spectrum aggregating process in cognitive radio.
Fig. 2 and Fig. 3 have provided two specific embodiment.
In Fig. 2, the right margin drop point of span exists
right side, retain V+1 idle frequency range, when by M
4while distributing to certain cognitive user, when certain user is distributed in the set of front 5 idle frequency ranges, the span that moves right, until the left margin of span aligns with the left margin of the 6th idle frequency range.
In Fig. 3, the right margin drop point of span exists
between, delete V+1 idle frequency range.When by M
3while distributing to certain cognitive user, when certain user is distributed in the set of front 4 idle frequency ranges, the span that moves right, until the left margin of span aligns with the left margin of the 5th idle frequency range.
Embodiment two: below in conjunction with Fig. 2, present embodiment is described, present embodiment is described further execution mode one, N=5.
Claims (2)
1. a method for static spectrum aggregating in cognitive radio, is characterized in that, the idle frequency range in radio static frequency spectrum is carried out to polymerization, distributes to cognitive user, when initial, the left margin of span is placed in to the left margin of described radio static frequency spectrum,
In described cognitive radio, the method for static spectrum aggregating comprises the following steps:
Step 1, by the ascending arrangement of N the required bandwidth of cognitive user, form N the required bandwidth aggregation B={B of cognitive user
1, B
2, B
3..., B
k..., B
n, wherein B
kbe k the required bandwidth of cognitive user k, k=1,2,3 ... N, N is more than or equal to 1 natural number;
Step 2, judge the right margin drop point site of span, in described span, V+1 idle frequency range is for cognitive user altogether, and described V+1 idle frequency range pressed the order arrangement from low frequency to high frequency, forms idle frequency range set
wherein [f
li, f
ui] represent i idle frequency range, f
libe the low frequency edge of i idle frequency range, f
uibe the high frequency border of i idle frequency range, V is more than or equal to 1 natural number,
If the right margin of span falls within
perform step three; If the right margin of span falls within
right side, perform step five;
Step 3, remove last idle frequency range [f of this span
l (V+1), f
u (V+1)], then perform step four,
Step 4, remaining this span V idle frequency range is calculated in order successively before the summation of n+1 idle band bandwidth polymerization
thereby obtain idle band bandwidth polymerization set M={M
1, M
2, M
3..., M
n... M
v-1, n=1,2,3 ... V-1,
Wherein m
irepresent i idle frequency range [f in this span
li, f
ui] bandwidth, i=1,2,3 ... V,
Then perform step six;
Step 5, the V+1 of this span idle frequency range is calculated in order successively before the summation of n+1 idle band bandwidth polymerization
thereby obtain idle band bandwidth polymerization set M={M
1, M
2, M
3..., M
n... M
v, n=1,2,3 ... V,
Wherein m
irepresent i idle frequency range [f in this span
li, f
ui] bandwidth, i=1,2,3 ... V+1,
Then perform step six;
Step 6, by the data in idle band bandwidth polymerization set M by from left to right order respectively with N the required bandwidth aggregation B of cognitive user in each B
kloop comparison;
After completely relatively finishing, at M
n>=B
ktime, if there is M
n=B
kthere is execution step seven; At M
n>=B
ktime, if M
n=B
knot there is not execution step nine; Only there is M
n<B
ktime, execution step eight;
Step 7, in this span, by first eligible M
n=B
kpolymerized frequency band M
ndistribute to k cognitive user, in N the required bandwidth aggregation B of cognitive user, idle band bandwidth polymerization set M and idle frequency range set F, used B
k, M
n, [f
li, f
ui] remove, then perform step ten;
Step 8, span is moved right, span left margin is alignd with the left margin of next idle frequency range; Then return to execution step two;
Step 9, in this span, by idle band bandwidth polymerization set M, first is greater than B
1polymerized frequency band M
ndistribute to k cognitive user, wherein k=arg min{M
n-B
k, k=1,2 ... N, in N the required bandwidth aggregation B of cognitive user, idle band bandwidth polymerization set M and idle frequency range set F, used B
k, M
n, [f
li, f
ui] remove, then perform step ten;
Step 10, span is moved right, span left margin is alignd with the left margin of n+2 idle frequency range; Then perform step 11;
Step 11, judge whether to meet two conditions simultaneously:
In N the required bandwidth aggregation B of cognitive user, there is unappropriated B
k,
In idle band bandwidth polymerization set M in span after movement, there is M
n,
Be judged as YES execution step two; Be judged as NO, finish, complete static spectrum aggregating process in cognitive radio.
2. a kind of method of static spectrum aggregating in cognitive radio according to claim 1, is characterized in that N=5.
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| CN102843229B (en) * | 2012-08-24 | 2015-01-14 | 北京邮电大学 | Frequency spectrum aggregation method based on business delay demands |
| CN103249052B (en) * | 2013-05-24 | 2015-09-16 | 哈尔滨工业大学 | Based on the frequency spectrum distributing method optimizing access cognitive user number in cognitive radio system |
| CN103281698A (en) * | 2013-05-24 | 2013-09-04 | 哈尔滨工业大学 | Method for realizing frequency spectrum allocation in cognitive radio by applying static frequency spectrum aggregation technology |
| WO2018035771A1 (en) * | 2016-08-24 | 2018-03-01 | 深圳天珑无线科技有限公司 | Method and device for detecting idle frequency band |
| CN110267227B (en) * | 2018-03-12 | 2021-02-12 | 华为技术有限公司 | Data transmission method, related equipment and system |
| CN108540416A (en) * | 2018-03-21 | 2018-09-14 | 中国人民解放军国防科技大学 | Cognitive radio-based C/Ku frequency band NC-OFDM satellite communication method |
| CN108847910B (en) * | 2018-08-23 | 2021-02-02 | 广州海格通信集团股份有限公司 | Spectrum sensing method and device and spectrum sensing equipment |
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| CN101827418A (en) * | 2010-05-07 | 2010-09-08 | 北京科技大学 | Energy optimization-based cognitive radio multicast routing method |
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