CN101778435A - Method and device for allocating frequency spectrum resource in heterogeneous wireless network - Google Patents

Abstract

The invention provides a method and a device for allocating frequency spectrum resource in a heterogeneous wireless network, which belong to the field of network communication. The method comprises the following steps: after the network at a licensed frequency band receives the requests from unlicensed users, judging whether a common frequency band is idle, if so, receiving the requests from the unlicensed users, and allocating the unlicensed users to the common frequency band, otherwise, receiving the requests from the unlicensed users when a reserved frequency band is idle, and allocating the unlicensed users to the reserved frequency band, wherein the common frequency band provides service to licensed users and the unlicensed users, and the reserved frequency band specially provides service to the unlicensed users. The technical scheme provided by the specific embodiment of the invention has the advantages of ensuring the service quality of the unlicensed users when the licensed users appear.

Description

A kind of distribution method and device of heterogeneous wireless network intermediate frequency spectrum resource

Technical field

The present invention relates to the communications field, relate in particular to a kind of distribution method and device of heterogeneous wireless network intermediate frequency spectrum resource.

Background technology

In recent years, from 3G to WLAN, WiMAX, from UWB to ZigBee, from Bluetooth to DVB-H, the diversified development pattern of radio communication is obvious day by day, and the complementation of various radio network techniques is merged has become trend of the times.Developing rapidly of radio communication not only organically merged heterogeneous network and had higher requirement, and proposed higher frequency spectrum resource demand.Existing wireless frequency spectrum distribution system is that fixed frequency spectrum is distributed, and is 2 parts with spectrum division: authorize frequency range (Licensed FrequencyBand, LFB) and unauthorized frequency range (Unlicensed Frequency Band, UFB).Most frequency spectrum resource is used to authorize frequency range, for example 3G, WiMAX, UWB etc.; And the frequency spectrum resource of unauthorized frequency range is wanted much less, because the fast development of radio communication services such as WLAN, WPAN, WMAN, the unauthorized frequency range that these networks are worked approaches to saturation.

Utilize the measurement result of situation to show to frequency spectrum resource in recent years, (LicensedUsers LUs) authorizes frequency spectrum in fact to utilize extremely insufficiently (being lower than 15%) to it to authorized user, exists a large amount of frequency spectrum holes; Compare with traditional fixed frequency spectrum allocative decision, cognitive radio (CognitiveRadio, CR) technology is introduced unauthorized user (Unlicensed Users in authorizing frequency range, ULUs) frequency spectrum of chance formula insertion authority network, for solving the frequency spectrum resource deficiency, improve the availability of frequency spectrum and started brand-new situation.For the consideration of protection authorized user communication quality, the introducing of unauthorized user need be satisfied a prerequisite, i.e. its transmission must be satisfied the interference temperature constraint of authorized user; In addition, when authorized user occurred, unauthorized user should be given back current mandate frequency spectrum immediately, then sought other idle frequency range.

In realizing process of the present invention, the inventor finds prior art, and there are the following problems:

Because the technical scheme of prior art is not the special reserved band of unauthorized user, so this scheme must influence the service quality (Qos) of unauthorized user.

Summary of the invention

The specific embodiment of the present invention provides a kind of distribution method and device of wireless network intermediate frequency spectrum resource, and this method and device have the advantage of the service quality that guarantees unauthorized user.

The invention provides a kind of distribution method of heterogeneous wireless network intermediate frequency spectrum resource, described method comprises:

After the network of authorizing frequency range receives the request of unauthorized user, judge that whether common frequency range is idle, in this way, then accepts the request of described unauthorized user, and described unauthorized user is assigned to common frequency range;

As not, then when reserved band is idle, receives the request of described unauthorized user, and described unauthorized user is assigned to reserved band;

Described common frequency range is: the frequency range that service is provided for authorized user and unauthorized user; Described reserved band is: aim at the frequency range that unauthorized user provides service.

The invention provides a kind of distributor of heterogeneous wireless network intermediate frequency spectrum resource, described device comprises:

Judging unit is used for after the network of authorizing frequency range receives the request of unauthorized user, judges whether common frequency range is idle;

Common access unit is used for going out when being in described judgment unit judges, accepts the request of described unauthorized user, and described unauthorized user is assigned to common frequency range;

Reserve access unit, be used for when described judgment unit judges goes out not, then when reserved band is idle, receives the request of described unauthorized user, and described unauthorized user being assigned to reserved band;

Described common frequency range is: the frequency range that service is provided for authorized user and unauthorized user; Described reserved band is: aim at the frequency range that unauthorized user provides service.

The technical scheme that is provided by the specific embodiment of the invention described above has when authorized user occurs, and also can guarantee the advantage of the service quality of unauthorized user.

Description of drawings

Fig. 1 is the flow chart of the distribution method of a kind of heterogeneous wireless network intermediate frequency spectrum resource provided by the invention;

Fig. 2 is the structure chart of the distributor of a kind of heterogeneous wireless network intermediate frequency spectrum resource provided by the invention.

Embodiment

The specific embodiment of the invention provides a kind of distribution method of heterogeneous wireless network intermediate frequency spectrum resource, and this method comprises as shown in Figure 1:

S11, after the request that receives unauthorized user, whether idle, in this way, then carry out step S12 if detecting common frequency range; Otherwise carry out S13-S15;

S12, accept the request of unauthorized user, and unauthorized user is assigned to common frequency range;

S13, whether idle, in this way, then carry out S14 if then detecting reserved band; Otherwise carry out S15;

S14, accept the request of unauthorized user, and unauthorized user is assigned to reserved band;

The request of S15, refusal unauthorized user.

Unauthorized user in the method provided by the invention does not have in common frequency range under the situation of idle channel unauthorized user to be assigned to reserved band, and then has guaranteed the Qos of unauthorized user.

Said method can be by finishing at the network of authorizing frequency range, for example; 3G, WiMAX, UWB etc.

Common frequency range in the said method can for, for authorized user and unauthorized user provide the frequency range of service, reserved band can for, aim at the frequency range that unauthorized user provides service.

Optionally, said method can also comprise after S14: as detect common frequency range the free time is arranged, then unauthorized user is transformed into common frequency range.When common frequency range has the free time, unauthorized user is transformed into common frequency range from reserved band, increased the number of channel of reserved band, make reserved band can insert more authorized user, further improved unauthorized user Qos,

Optionally, the distribution method of above-mentioned common frequency range and reserved band can be static configuration, is example with the 3G network, and 80% in the mandate frequency range of 3G network distributed to common frequency range, will 20% distribute to reserved band in the mandate frequency range of 3G network.Certainly the distribution method of above-mentioned common frequency range and reserved band can be dynamic-configuration, and promptly the outage probability that allows according to authorized user calculates the channel number of reserved band; Concrete computational methods can for:

For the convenience of calculating, the mandate frequency range with system is divided into reserved band set ￡ here _R=1,2 ..., L} and common frequency range set ￡ _N=1,2 ..., J}, wherein L+J=K; L, J represent the channel number of reserved band and the channel number of common frequency range respectively, and K represents to authorize the total number of channel of frequency range; The indication vector

Whether K is occupied for the expression channel, φ _k=0 expression channel K free time, and φ _k=1 expression channel K is used.Make (i, j, l) expression system mode, i wherein, j and l represent to take the number of the unauthorized user of common frequency range respectively, take common frequency range authorized user number and take the number of the unauthorized user of reserved band; The state space Δ of system=(i, j, l) | i+j≤J, l≤L}.Make π that (l) the expression probability of stability distributes, wherein (i, j, l) ∈ Δ for i, j;

When channel resource is sufficient, i.e. Δ ₁=(i, j, l) | and i+j＜J, l=0}, the user of all new networkings, no matter authorized user or unauthorized user can both be assigned to common frequency range, and therefore the situation of communication disruption can not take place, and use formula (1) to be expressed as so:

[iμ _s+λ _s+(i+1)μ _p+λ _p]π(i，j，l)

＝λ _sπ(i-1，j，0)+(i+1)μ _sπ(i+1，j，0)

+λ _pπ(i，j-1)+(i+1)μ _pπ(i，j+1)(1)

Wherein, μ _sThe probability of the service time of expression unauthorized user business; μ _pThe probability of the service time of expression authorized user business; λ _sThe expression unauthorized user arrives probability, λ _pThe expression authorized user arrives probability.

Common frequency ranges all in system is all occupied, simultaneously, has the part reserved band also being used by unauthorized user, at this moment the state Δ of system ₂=(i, j, l) | i+j=J, l＜L}; Can be expressed as with formula (2):

[λ _s+(j+l)μ _s+jμ _p+λ _p]π(i，j，l)

＝(i+j+1)μ _sπ(i，j，l+1)+λ _sπ(i，j，l-1)

+λ _pπ(i+1，j-1，l-1)+(j+1)μ _pπ(i-1，j+1，l+1)(2)

Common frequency ranges all in system all are being authorized to user's use, and unauthorized user can only use channel reservation, at this moment the state Δ of system ₃=(i, j, l) | i=0, j=J, l＜L}; Can be expressed as with formula (3):

[λ _s+lμ _s+Jμ _p]π(0，J，l)

＝(l+1)μ _sπ(0，J，l+1)+λ _sπ(0，J，l-1)(3)

+λ _pπ(1，J-1，l-1)

Common frequency ranges all in system all are being authorized to user's use, and all reservation frequency spectrums are all being used by unauthorized user, at this moment the state Δ of system ₄=(i, j, l) | i=0, j=J, l=L}; Can be expressed as with formula (4):

[Lμ _s+Jμ _p]π(0，J，L)＝λ _sπ(0，J，L-1)+λ _pπ(1，J-1，L-1)(4)

All probabilities of stability should satisfy normalization constraint ∑ in above-mentioned formula (1), (2), (3) and (4) _{(i, j, l) ∈ Δ}π (i, j, l)=1, wherein

Unite above-mentioned (1), (2), (3) and (4) can find the solution the probability of stability distribute π (i, j, l) | (i, j, l) ∈ Δ }; Concrete method for solving can be referring to the description of document " Introduction to Queueing Theory ".

In mechanism provided by the present invention, when common frequency range is all occupied, will cause the new authorized user communication disruption that networks, the authorized user outage probability is:

$P_b^p\left(L\right)={\mathrm{\Σ}}_{(i,j,l)\∈{\mathrm{\Δ}}_3\∪{\mathrm{\Δ}}_4}\mathrm{\π}(i,j,l)---\left(5\right)$

When common frequency range and reserved band are all occupied, will cause the new unauthorized user communication disruption that networks, the unauthorized user outage probability is:

$P_b^s\left(L\right)={\mathrm{\Σ}}_{(i,j,l)\∈{\mathrm{\Δ}}_4}\mathrm{\π}(i,j,l)---\left(6\right)$

For the unauthorized user of communicating by letter, when not having idle channel, the new authorized user that networks will cause the interruption of unauthorized user on the common frequency range, and this outage probability calculating formula is:

$P_{\mathrm{Int}}\left(L\right)={\mathrm{\Σ}}_{(i,j,l)\∈{\mathrm{\Δ}}_4}\frac{\mathrm{\π}(i,j,l)}{i}---\left(7\right)$

For the throughput of unauthorized user, its calculating formula is:

$\mathrm{\ρ}\left(L\right)={\mathrm{\Σ}}_{(i,j,l)\∈\mathrm{\Δ}}\mathrm{i\π}(i,j,l){\mathrm{\μ}}_s{P}_{\mathrm{com}}\left(L\right)---\left(8\right)$

Wherein, $P_{\mathrm{com}}\left(L\right)=1-[P_b^s\left(L\right)+(1-P_b^s\left(L\right))\frac{{\mathrm{\λ}}_p{P}_{\mathrm{Int}}\left(L\right)}{{\mathrm{\μ}}_s+{\mathrm{\λ}}_p{P}_{\mathrm{Int}}\left(L\right)}].$

The present invention uses Sigmoid type utility function to weigh the throughput of unauthorized user, and concrete calculating formula is as follows:

$U\left(\mathrm{\ρ}\left(L\right)\right)=\frac{1}{1+\exp \{-g[\mathrm{\ρ}\left(L\right)-h\left]\right\}}---\left(9\right)$

Wherein, g and h are constant.

In order to limit in the disconnected therein probability constraints scope of the interference of authorized user, and the effectiveness of maximization formula (9), an optimal channel reservation number L need be found ^*The present invention P _BMAX ^pThe maximum outage probability (can set) that the expression authorized user allows according to actual conditions, therefore, preferred channels is reserved calculating formula and is:

L ^*＝arg?max?U

$s.t.,P_b^p\left(L\right)<P_{\mathrm{bMAX}}^p,L\&le;K---\left(10\right)$

Solution formula (10) obtains the number of channel L that reserves frequency spectrum ^*

When the number of channel of dynamic distribution reserved band, find the solution according to said method and to obtain number of channel L ^*, make this method under the prerequisite of the outage probability that guarantees authorized user, also can guarantee the service quality of unauthorized user.

The present invention also provides a kind of distributor of heterogeneous wireless network intermediate frequency spectrum resource, and described device comprises as shown in Figure 2:

Judging unit 21 is used for after the network of authorizing frequency range receives the request of unauthorized user, judges whether common frequency range is idle;

Common access unit 22 is used for going out when being in described judgment unit judges, accepts the request of described unauthorized user, and described unauthorized user is assigned to common frequency range;

Reserve access unit 23, be used for when described judgment unit judges goes out not, then when reserved band is idle, receives the request of described unauthorized user, and described unauthorized user being assigned to reserved band;

Described common frequency range is: the frequency range that service is provided for authorized user and unauthorized user; Described reserved band is: aim at the frequency range that unauthorized user provides service.

Optionally, said apparatus also comprises:

Converting unit 24, be used for described reservation access unit finish described unauthorized user is assigned to reserved band after, judge when common frequency range is idle, described unauthorized user is transformed into described common frequency range.

Unauthorized user in the device provided by the invention does not have in common frequency range under the situation of idle channel unauthorized user to be assigned to reserved band, and then has guaranteed the Qos of unauthorized user.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method can instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.

The described technical scheme of the specific embodiment of the invention has unauthorized user and does not have in common frequency range under the situation of idle channel unauthorized user to be assigned to reserved band, and then has guaranteed the advantage of the Qos of unauthorized user.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (7)

1. the distribution method of a heterogeneous wireless network intermediate frequency spectrum resource is characterized in that, described method comprises:

After the network of authorizing frequency range receives the request of unauthorized user, judge that whether common frequency range is idle, in this way, then accepts the request of described unauthorized user, and described unauthorized user is assigned to common frequency range;

As not, then when reserved band is idle, receives the request of described unauthorized user, and described unauthorized user is assigned to reserved band;

Described common frequency range is: the frequency range that service is provided for authorized user and unauthorized user; Described reserved band is: aim at the frequency range that unauthorized user provides service.

2. method according to claim 1 is characterized in that, described described unauthorized user is assigned to also comprises after the reserved band:

When common frequency range is idle, described unauthorized user is transformed into described common frequency range.

3. method according to claim 1 is characterized in that, described method also comprises: described common frequency range of static state or dynamic-configuration and reserved band.

4. method according to claim 3 is characterized in that, when described common frequency range of dynamic-configuration and reserved band, the computational methods of the described reserved band number of channel are:

L ^*＝arg?maxU

$s.t.,P_b^p\left(L\right)<P_{\mathrm{bMAX}}^p,L\&le;K$

Find the solution above-mentioned formula and obtain reserved band number of channel L ^*

P wherein _BMAX ^pThe maximum outage probability that the expression authorized user allows;

$U\left(\mathrm{\&rho;}\left(L\right)\right)=\frac{1}{1+\exp \{-g[\mathrm{\&rho;}\left(L\right)-h\left]\right\}};$

$P_b^p\left(L\right)={\mathrm{\&Sigma;}}_{(i,j,l)\&Element;{\mathrm{\&Delta;}}_3\&cup;{\mathrm{\&Delta;}}_4}\mathrm{\&pi;}(i,j,l);$

$P_b^s\left(L\right)={\mathrm{\&Sigma;}}_{(i,j,l)\&Element;{\mathrm{\&Delta;}}_4}\mathrm{\&pi;}(i,j,l);$

Δ ₃＝{(i，j，l)|i＝0，j＝J，l＜L}；

Δ ₄＝{(i，j，l)|i＝0，j＝J，l＝L}；

ρ(L)＝∑ _{(i，j，l)∈Δ}iπ(i，j，l)μ _sP _com(L)；

$P_{\mathrm{com}}\left(L\right)=1-[P_b^s\left(L\right)+(1-P_b^s\left(L\right))\frac{{\mathrm{\&lambda;}}_p{P}_{\mathrm{Int}}\left(L\right)}{{\mathrm{\&mu;}}_s+{\mathrm{\&lambda;}}_p{P}_{\mathrm{Int}}\left(L\right)}];$

$P_{\mathrm{Int}}\left(L\right)={\mathrm{\&Sigma;}}_{(i,j,l)\&Element;{\mathrm{\&Delta;}}_4}\frac{\mathrm{\&pi;}(i,j,l)}{i};$

L, J represent the channel number of reserved band and the channel number of common frequency range respectively, and (l) the expression probability of stability distributes π for i, j; (l) network system situation of frequency range is authorized in expression for i, j; μ _sThe probability of the service time of expression unauthorized user business; λ _pThe expression authorized user arrives probability.

5. method according to claim 1 is characterized in that being, the network of described mandate frequency range comprises: 3G, WiMAX or UWB.

6. the distributor of a heterogeneous wireless network intermediate frequency spectrum resource is characterized in that, described device comprises:

Judging unit is used for after the network of authorizing frequency range receives the request of unauthorized user, judges whether common frequency range is idle;

Common access unit is used for going out when being in described judgment unit judges, accepts the request of described unauthorized user, and described unauthorized user is assigned to common frequency range;

Reserve access unit, be used for when described judgment unit judges goes out not, then when reserved band is idle, receives the request of described unauthorized user, and described unauthorized user being assigned to reserved band;

Described common frequency range is: the frequency range that service is provided for authorized user and unauthorized user; Described reserved band is: aim at the frequency range that unauthorized user provides service.

7. device according to claim 6 is characterized in that, described device also comprises:

Converting unit, be used for described reservation access unit finish described unauthorized user is assigned to reserved band after, judge when common frequency range is idle, described unauthorized user is transformed into described common frequency range.

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