CN103888950A - Double-layer network dynamic spectrum allocation method and system under baseband concentration framework - Google Patents

Abstract

The invention discloses a double-layer network dynamic spectrum allocation method and system under a base-band concentration framework. Baseband processing units and spectrum management functions of a macro cell base station and a miniature cell base station in the system are concentrated to a large-scale baseband processing center. Based on the framework in the invention, spectrum resources are divided into mutually-orthogonal two parts; set partitioning is carried out on miniature cells within the coverage range of macro cells; the set partitioning condition of the miniature cell is adjusted; and different spectrum resources are allocated to the miniature cells in different sets. According to the method and system in the invention, the problems of spectrum resource allocation and management in a double-layer cellular network can be effectively solved, the utilization efficiency of the spectrum in the double-layer cellular network is improved, cross-layer same frequency interference between the macro cell and the miniature cell is restrained, and the quality of user service is improved.

Description

Double-layer network method for allocating dynamic frequency spectrums and system under a kind of base band centralized architecture

Technical field

The present invention relates to cordless communication network technical field, relate in particular to double-layer network method for allocating dynamic frequency spectrums and system under a kind of base band centralized architecture.

Background technology

Under stable, reliable high data rate Access Network supports, abundant radio multimedium business develop rapidly is also widely used, and causes wireless data service amount to present blowout formula and increases.But due to mobile communication usable spectrum resource-constrained, in the time that system communication amount demand substantially exceeds its capacity, user's efficient communication speed can reduce because of the restriction of power system capacity, thereby reduces QoS of customer.

Macrocell is the region that area is very large, covering radius is 1～30km approximately, base station transmit antennas is erected at Adjacent Buildings top conventionally, conventionally, between most of sending and receiving end, signal does not have direct path, but for to cost consideration, normally power limited of mobile terminal, for certain through-put power, symbol energy reduces with the increase of transmitted data rates.For the mobile terminal device of indoor user, especially work in the equipment of high carrier wave frequency range, loss will make high signal quality and high data rate be difficult to realize, thereby cannot guarantee effective covering of the whole coverage of macrocell.The appearance of isomery cellular network, formed by the low power base station such as Picocell base station, Femtcoell base station, spaced antenna and relay station and macro base station, can effectively provide covering to local hot spot areas, and low-power microcellular base station and macro cell base station common spectrum resource, can effectively improve the space availability ratio of frequency spectrum, the distance of further transmitting terminal and receiving terminal, improves user received signal intensity, reduce cellular network power consumption, improve QoS of customer.But the overlapping covering of microcellular and macrocell is given and has originally been brought huge challenge with regard to effective distribution and the management of nervous frequency spectrum resource.First, conventional cellular network framework cannot meet the management of share spectrum resources in isomery cellular network; Secondly, along with being overlapped in increasing of microcellular quantity on macrocellular, if do not take effective frequency spectrum distributing method, will produce the co-channel interference of serious interlayer cellular network, thereby run counter to desire, reduce QoS of customer.

Microcellular is incorporated into after traditional cellular network, and academia and industrial circle are tended to two schemes for the planning of frequency spectrum resource: global frequencies multiplexing scheme and orthogonal frequency splitting scheme.For the former, the multiplexing all system spectral resources of microcellular network and macrocell.Because the transmitting power of microcellular and the transmitting power of macro base station differ 5-10dB conventionally, under global frequencies is multiplexing, the cross-layer between microcellular and macrocell is disturbed becomes one of key factor that restriction microcellular capacity improves.And for the latter, microcellular network and macrocell use mutually orthogonal frequency spectrum resource.Under orthogonal frequency is divided, although the cross-layer that can effectively alleviate between microcellular and macrocell is disturbed, can seriously reduce the power system capacity of community.The introducing of microcellular causes interference structure complicated, and along with the actual deployment of microcellular, foreseeable intensive deployment and overlapping covering will cause in community, disturb more serious.Therefore,, if there is no effective frequency spectrum resource allocation algorithm, the network architecture of microcellular and macrocell mixed networking finally can reduce power system capacity on the contrary.

Extensive base band focuses on the appearance of framework, has caused the extensive concern of research field, operator and equipment manufacturers.Extensive base band focuses in framework; the Base-Band Processing part of macro cell base station and microcellular base station and dynamic spectrum resource management part concentrate on extensive Base-Band Processing center, and the radio frequency part of macro cell base station and microcellular base station is connected to extensive Base-Band Processing center by optical fiber.This centralized architecture is conducive to carry out effective dynamic spectrum resource management for complicated microcellular and macrocell overlapping network, and focusing on of baseband signal makes the Base-Band Processing part of former base station separate with radio frequency part, thereby simplify base station design, reduced base station volume and processed power consumption, refrigeration power consumption etc.

Summary of the invention

The object of the invention is to; how to provide a kind of microcellular and macrocell double-layer network method for allocating dynamic frequency spectrums that is applicable to extensive base band and focuses on framework for overcoming; effectively solve the cross-layer interference problem between macrocell and microcellular simultaneously, the invention provides double-layer network method for allocating dynamic frequency spectrums and system under a kind of base band centralized architecture.

For achieving the above object, the invention provides the double-layer network method for allocating dynamic frequency spectrums under a kind of base band centralized architecture, the method is distributed for the frequency spectrum resource that solves macrocell and microcellular double-layer network, and described method comprises following steps:

Step 101) microcellular that is positioned at macrocell coverage area is divided into following set:

The microcellular that microcellular user signal interference ratio detected value is greater than to signal interference ratio threshold value is divided to the first microcellular set F ₁in, and the microcellular that microcellular user signal interference ratio detected value is less than signal interference ratio threshold value is divided to the second microcellular set F ₂in;

Step 102) given all frequency spectrum resource S are divided into mutually orthogonal two parts Sp and Sn, described Sp and Sn union are whole frequency spectrum resource S; Sp is set to share spectrum resources, simultaneously using Sn as special frequency spectrum resource; Or Sn is set to share spectrum resources, simultaneously using Sp as special frequency spectrum resource;

Obtaining according to the maximum principle of the average efficiency of all community users the ratio value that share spectrum resources accounts for whole frequency spectrum resource S is:

$v_s^{*}=\frac{1}{\frac{\left|{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA00002625778600031.png"\; state="\{\{state\}\}">F</figure-callout>}}_2\right|}{|{\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="HDA00002625778600031.png,HDA00002625778600061.png"\; state="\{\{state\}\}">F</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA00002625778600031.png"\; state="\{\{state\}\}">F</figure-callout>}}_2|+\left|{\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="HDA00002625778600031.png,HDA00002625778600061.png"\; state="\{\{state\}\}">F</figure-callout>}}_1\right|}+1}$

Step 103) share spectrum resources is distributed to the first microcellular set F ₁in microcellular and macrocell, special frequency spectrum resource is distributed to the second microcellular set F ₂in microcellular.

Optimize above-mentioned steps 101) and 102) between also comprise following steps:

According to the requirement of grand user's signal interference ratio, service efficiency Probabilistic Decision-making is is further optimized and revised the first microcellular set F ₁or the second microcellular set F ₂in each element, obtain the 3rd microcellular set K _swith the 4th microcellular set Kp;

Wherein, described the 3rd microcellular set K _sbe the first microcellular set F ₁proper subclass, described the 4th microcellular set Kp comprises: the second microcellular set F ₂when optimizing and revising from the first microcellular set F ₁the set that the community of middle deletion forms; When described efficiency Probabilistic Decision-making refers to the affiliated set of further adjustment microcellular, calculate respectively each microcellular in F1 and use the probability of sharing frequency spectrum, the microcellular that probability is larger uses the probability of shared frequency spectrum larger.

Now,

The shared ratio value of share spectrum resources is:

$v_s^{*}=\frac{1}{\frac{\left|K_p\right|}{|K_S+K_P|+\left|K_s\right|}+1}$

Described step 103) be:

Share spectrum resources is distributed to the 3rd microcellular set K _sin microcellular and macrocell, special frequency spectrum resource is distributed to the 4th microcellular set K _pin microcellular.

Above-mentioned efficiency Probabilistic Decision-making specifically comprises following steps:

Step 201) certain grand user's transmitting pilot signal first, the first microcellular set F ₁in microcellular i grand user is produced to the big or small I of interference according to reception input now _i, and send to grand user, then grand user is according to receiving signal statistics set F ₁in the quantity n of microcellular _f, send to the first microcellular set F ₁in all microcellulars;

Step 202) adopt following formula to calculate the first microcellular set F ₁in the probability of shared frequency spectrum of each microcellular:

$p_s^W\left(i\right)=\min \{1,\frac{S_m^q}{n_F{I}_i}\},$

Step 202) choose share frequency spectrum probability larger before | Ks| microcellular is as the 3rd microcellular set K _sin element;

Described | Ks| adopts following formula to determine:

$\left|\mathrm{Ks}\right|=\left[\underset{i\&Element;F_1}{\mathrm{\&Sigma;}}{p}_s^W\left(i\right)\right]$

Step 203) by the first microcellular set F ₁in remaining " n _f-| K _s| " individual microcellular and the second microcellular set F ₂in all microcellulars as the element in the 4th microcellular set Kp.

In the time that grand number of users is m, variables L (m, n are set _f) record obtains the 3rd microcellular set K after certain grand user n is adopted to said method _sand microcellular numbering in this set, and every row of variables L is added, obtain a 1 row n _fthe row vector of row, and the value element position that equals m is and belongs to the 3rd microcellular set K _suse share the microcellular numbering of frequency spectrum, all the other microcellulars belong to the 4th microcellular set K _puse special frequency spectrum, and m>1.

Above-mentioned steps 101) further comprise following steps:

Step 101-1) macro base station transmitting pilot signal, all microcellular user i will detect the signal interference ratio γ now obtaining _f, and send to extensive Base-Band Processing center (i);

Step 101-2) extensive Base-Band Processing center is the detected value γ of user's signal interference ratio _f(i) with signal interference ratio threshold value

compare, if

microcellular i belongs to the first microcellular set F ₁in element; If microcellular i belongs to the second microcellular set F ₂in element.

Also provide the system of the double-layer network dynamic frequency spectrum deployment under a kind of base band centralized architecture based on said method the present invention, described system comprises: extensive baseband and optical transport network; Macrocell intercoms by described optical transport network and described extensive baseband mutually with the microcellular in macrocell coverage area;

Described extensive baseband further comprises:

Frequency spectrum resource is divided module, for all frequency spectrum resources are divided into mutually orthogonal two parts, and optimize orthogonal two parts and account for the ratio of all frequency spectrum resources according to the maximum principle of the average efficiency of all community users, and using in orthogonal two parts wherein a part as shared frequency spectrum, another part is as special frequency spectrum;

Microcellular sort module, is divided to the first microcellular set F for the microcellular that microcellular user signal interference ratio detected value is greater than to signal interference ratio threshold value ₁in, and the microcellular that microcellular user signal interference ratio detected value is less than signal interference ratio threshold value is divided to the second microcellular set F ₂in;

Classification results is optimized and revised module, and for according to the requirement of grand user's signal interference ratio, service efficiency Probabilistic Decision-making is is further optimized and revised the first microcellular set F ₁or the second microcellular set F ₂in each element, obtain the 3rd microcellular set K _swith the 4th microcellular set Kp;

Resource distribution module, for being allocated to share spectrum resources the first microcellular set F ₁and macrocell, special frequency spectrum resource is distributed to the second microcellular set F simultaneously ₂; Or share spectrum resources is allocated to the 3rd microcellular set K _sand macrocell, special frequency spectrum resource is distributed to the 4th microcellular set Kp simultaneously.

Above-mentioned frequency spectrum resource is divided module and is further comprised:

Processing module, for according to microcellular set dividing condition, calculates respectively share spectrum resources and special frequency spectrum resource and accounts for the ratio of whole resources;

Cut apart module, according to the ratio of sharing frequency spectrum and the shared whole resources of special frequency spectrum, whole frequency spectrum resources are divided into mutually orthogonal two parts.

Above-mentioned microcellular sort module further comprises:

Receiver module, detects the value of the signal interference ratio of the pilot signal of macro base station transmitting for receiving all microcellular users;

Relatively judging module, the signal interference ratio value that detection is obtained and the signal interference ratio threshold value of setting compare, and in the time that the former is greater than the latter, will be divided to the first microcellular set F corresponding to the microcellular of this detection signal interference ratio value ₁in, in the time that being less than the latter, the former is divided to the second microcellular set F corresponding to the microcellular of this detection signal interference ratio value ₂in.

Above-mentioned classification results is optimized and revised module and is further comprised:

Statistical module, for adding up the first microcellular set F ₁in each microcellular use the probability of sharing frequency spectrum;

Effectiveness Probabilistic Decision-making module, by the first set F ₁in microcellular use the probable value of sharing frequency spectrum to arrange with the order of successively decreasing, and determine the size of the 3rd microcellular set Ks:

by front | Ks| microcellular is divided into the 3rd microcellular set K _s, residue | F ₁|-| K _s| individual microcellular and the second set F ₂in microcellular be divided into the 4th microcellular set K _pin.

Above-mentioned resource distribution module is to the first microcellular set F ₁in microcellular and macrocell distribute and use share spectrum resources, microcellular in the second microcellular set F2 is distributed and uses special frequency spectrum resource; Or to the 3rd microcellular set K _sin microcellular and macrocell distribute and use share spectrum resources, microcellular in the 4th microcellular set Kp is distributed and uses special frequency spectrum resource.

Compared with prior art technical advantage of the present invention is:

The present invention is by disturbing inhibition cutting apart with distributing realization of frequency spectrum resource, thereby can effectively improve the spectrum reuse rate of the double-layer network of macrocell and the overlapping covering of microcellular, grand user's outage probability is disturbed, effectively reduced to the cross-layer effectively alleviating between macrocell and microcellular simultaneously.

Accompanying drawing explanation

Fig. 1 is that the extensive base band in the embodiment of the present invention focuses on the double-deck cellular network architecture schematic diagram under framework;

Fig. 2 is the schematic flow sheet of the inventive method embodiment;

Fig. 3 is signal reciprocal process schematic diagram in the inventive method embodiment;

Fig. 4 is the inventive method embodiment intermediate frequency spectrum resource division instance graph;

Fig. 5 gathers dynamic allocation method flow chart in the inventive method embodiment;

Fig. 6 is effectiveness Probabilistic Decision-making method flow diagram in the inventive method embodiment;

Embodiment

For making object of the present invention, content and advantage clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.

As shown in Figure 1; macrocell and the microcellular double-layer network dynamic frequency spectrum deployment system schematic that focuses on framework in the present embodiment based on extensive base band; in this system, the baseband processing unit of macro cell base station and microcellular base station and spectrum management capability concentrate on extensive Base-Band Processing center, and the radio frequency unit of macro cell base station and microcellular base station is connected to extensive Base-Band Processing center by optical fiber.In each extensive Base-Band Processing, baseband processor frame is responsible for carrying out base band signal process and dynamic spectrum resource management in the heart; each Base-Band Processing frame is connected mutually and is intercomed by communication line; for example; X2 communication interface in long evolving system (LTE); thereby the information of each Base-Band Processing frame of real-time, interactive, thereby meet the distribution of the centralized dynamic spectrum resource in extensive Base-Band Processing center.

Based on said system, the invention provides the dynamic spectrum resource allocation methods in a kind of macrocell and microcellular double-layer network, as shown in Figure 2, specifically comprise the following steps:

Step 101) given all frequency spectrum resource S are divided into mutually orthogonal two parts S by extensive Base-Band Processing center _pand S _n, described S _pand S _nunion is whole frequency spectrum resource S, and determines according to structure utility function the best proportion that system spectral resources is divided;

Step 102) extensive Base-Band Processing center is divided into respectively the first microcellular set F according to microcellular user signal interference ratio detected value by each microcellular ₁or the second microcellular set F ₂in, wherein said all microcellulars are all positioned at macrocell coverage area, and the first microcellular refers to that microcellular user signal interference ratio detected value is greater than the microcellular set of signal interference ratio threshold value, and the second microcellular refers to that microcellular user signal interference ratio detected value is less than the microcellular set of signal interference ratio threshold value;

Step 103) extensive Base-Band Processing center is according to the requirement of grand user's signal interference ratio, and service efficiency Probabilistic Decision-making is is further optimized and revised the first microcellular set F ₁or the second microcellular set F ₂in each element, obtain the 3rd microcellular set K _swith the 4th microcellular set Kp;

Wherein, described the 3rd microcellular set K _sbe the first microcellular set F ₁proper subclass, described the 4th microcellular set Kp comprises: the second microcellular set F ₂when optimizing and revising from the first microcellular set F ₁the set that the community of middle deletion forms; When described efficiency Probabilistic Decision-making refers to the affiliated set of further adjustment microcellular, calculated respectively each microcellular in F1 and used the probability of sharing frequency spectrum, the microcellular that probability is larger uses the probability of shared frequency spectrum larger.

Step 104) extensive Base-Band Processing center is mutually orthogonal two parts frequency spectrum resource S _pand S _nbe set to respectively share frequency spectrum and special frequency spectrum, or by two parts frequency spectrum resource S _pand S _nbe set to respectively special frequency spectrum and shared frequency spectrum; And share spectrum resources is distributed to the 3rd microcellular set K _swith macrocell, special frequency spectrum resource is distributed to the 4th microcellular set Kp simultaneously.

In a word, microcellular is divided into two mutually orthogonal set by the present invention, turn to target with community user average efficiency maximum, whole frequency spectrum resources are divided into mutually orthogonal special frequency spectrum and shared frequency spectrum two parts, microcellular set KS and macrocell use share spectrum resources, and microcellular set Kp uses special frequency spectrum resource.And such scheme can also be by step 101), 102) and 104) distribute now step 104 for double-layer network resource) share spectrum resources is allocated to the first microcellular set F ₁with macrocell, special frequency spectrum resource is distributed to the second microcellular set F simultaneously ₂, the corresponding shared ratio of share spectrum resources is now:

$v_s^{*}=\frac{1}{\frac{\left|{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA00002625778600031.png"\; state="\{\{state\}\}">F</figure-callout>}}_2\right|}{|{\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="HDA00002625778600031.png,HDA00002625778600061.png"\; state="\{\{state\}\}">F</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA00002625778600031.png"\; state="\{\{state\}\}">F</figure-callout>}}_2|+\left|{\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="HDA00002625778600031.png,HDA00002625778600061.png"\; state="\{\{state\}\}">F</figure-callout>}}_1\right|}+1}$

Wherein, | F ₁+ F ₂| represent set F ₁with set F ₂the radix computing of union, | F ₁| represent set F ₁radix computing, | F ₂| represent set F ₂radix calculate.

Above-mentioned steps 101) in, described mutually orthogonal two parts frequency spectrum resource is respectively microcellular and macrocell is shared portions of the spectrum and the special portions of the spectrum of microcellular.

Wherein, it is to be target to the maximum with all users' of macrocell and all Microcells average efficiency that frequency spectrum resource is divided into mutually orthogonal two-part principle, obtaining now sharing frequency spectrum, to account for the ratio of all frequency spectrum resources relevant with the size of microcellular set, specifically comprises:

Make U represent the average efficiency of all community users, C _mk, C _fi, C _fjrepresent respectively grand number of users k, use the microcellular i that shares frequency spectrum and the link rate that uses the microcellular j of special frequency spectrum, K _srepresent to use the set of the microcellular of sharing frequency spectrum, K _prepresent the set of the microcellular that uses special frequency spectrum, | K _s| represent set K _sthe radix of middle microcellular.

1) whole frequency spectrum resources are divided into mutually orthogonal two parts, mutually orthogonal two parts are distributed to community on principle as special frequency spectrum resource and share spectrum resources respectively.Suppose that frequency spectrum segmentation problem is community user average efficiency maximization problems, is defined as:

$U=\frac{1}{\left|K_m\right|}\underset{k\&Element;K_m}{\mathrm{\&Sigma;}}\log C_{\mathrm{mk}}+\frac{1}{|K_s+K_p|}(\underset{i\&Element;K_s}{\mathrm{\&Sigma;}}\log C_{\mathrm{fi}}+\underset{j\&Element;K_p}{\mathrm{\&Sigma;}}\log C_{\mathrm{fj}}),$

Use shannon formula obtains: C _mk=v _slog (1+ γ _mk), C _fi=v _slog (1+ γ _fi), C _fj=v _plog (1+ γ _fj), wherein, v _srepresent to share frequency spectrum proportion, v _p(=1-v _s) represent special frequency spectrum proportion, γ _mkrepresent the signal interference ratio of grand user k, γ _firepresent the signal interference ratio of microcellular user i, γ _fjrepresent the signal interference ratio of microcellular user j;

2) suppose

representative of consumer average efficiency U while reaching maximum corresponding shared frequency spectrum account for the ratio of whole given frequency spectrum resources,

Because above-mentioned user's average efficiency U is a concave function,

meet

obtain

this formula is the condition that will meet user's average efficiency maximum, and the value of Vs is by Ks(or Kp, if K is microcellular sum, Ks=K-Kp) determine, therefore in the time having determined Ks by certain way, just can obtain now sharing frequency spectrum and account for the ratio of whole frequency spectrum resources, complete frequency spectrum and cut apart.Wherein, | K _s| represent set K _sradix, | K _s+ K _p| represent set K _swith set K _pthe radix of union, | K _p| represent set K _pradix.

In sum, knownly carry out frequency spectrum while cutting apart when turn to target with community user average efficiency maximum, share spectrum resources part proportion is only relevant with the set sizes of microcellular, determine after the set division of microcellular, can obtain the now size of share spectrum resources part, complete the orthogonal division to all frequency spectrum resources.

Above-mentioned steps 102) be specially:

Use F ₁represent the set of the microcellular that likely uses share spectrum resources, F ₂for likely using the set of microcellular of special frequency spectrum resource.Mutually orthogonal two parts frequency spectrum resource that shared frequency spectrum and special frequency spectrum obtain after being given frequency spectrum resource being cut apart.Mutually orthogonal two parts frequency spectrum resource that described share spectrum resources and special frequency spectrum resource obtain after being given frequency spectrum resource being divided.

First; macro base station radio-frequency front-end transmitting pilot signal; the detected value of user's signal interference ratio is sent to extensive Base-Band Processing center by microcellular; extensive Base-Band Processing center compares the detected value of microcellular user signal interference ratio and user's signal interference ratio threshold value; according to comparative result, microcellular is divided into mutually orthogonal frequency spectrum resource set; particularly, if detected value is greater than threshold value, corresponding microcellular belongs to set F ₁, otherwise belong to set F ₂.

Above-mentioned steps 103) be specially: according to grand user's signal interference ratio requirement, extensive Base-Band Processing center is used effectiveness Probabilistic Decision-making further to adjust the set dividing condition of microcellular.

Wherein, the step that described use effectiveness Probabilistic Decision-making is optimized and revised the set dividing condition of microcellular specifically comprises:

Order

represent the interference value allowing under the certain signal interference ratio requirement of grand user;

1) grand user's transmitting pilot signal, set F ₁in microcellular i (i ∈ F ₁) grand user is produced to the big or small I of interference according to reception input now _i, and sending to grand user, grand user is according to receiving signal statistics set F ₁in the quantity n of microcellular _f, send to microcellular;

2) set F ₁in microcellular i calculate to use and share the probability of frequency spectrum

and probable value is sent to extensive Base-Band Processing center, extensive Base-Band Processing center calculation is used the microcellular quantity of sharing frequency spectrum to be: and microcellular is numbered to 1,2 ..., | F ₁|; 3) F will be gathered in extensive Base-Band Processing center ₁in the probable value of microcellular arrange with the order of successively decreasing, front | Ks| microcellular belongs to gathers K _suse share spectrum resources, residue | F ₁|-| K _s| individual microcellular and set F ₂in microcellular belong to set K _puse special frequency spectrum resource;

Wherein, described method is for single grand user's situation, and in the time that grand number of users is m, to each grand user n, (n≤m) all adopt said method, extensive Base-Band Processing center arranges variables L (m, n _f) record adopts after said method grand user n, the microcellular numbering that can use share spectrum resources (1 representative meets, and 0 representative does not meet) obtaining, and every row of variables L is added, a 1 row n obtained _fthe row vector of row, wherein, the element position that value equals m is to belong to gathers K _suse share the microcellular numbering of frequency spectrum, all the other microcellulars belong to set K _puse special frequency spectrum.

Above-mentioned steps 104) in, be described set K _pin microcellular, set K _sin microcellular and macrocell while distributing respectively described mutually orthogonal two parts frequency spectrum resource, described set K _sin microcellular and macrocell select described share spectrum resources, described set K _pin microcellular select described special frequency spectrum resource.

Basic thought of the present invention is to carry out cooperation spectrum resource by extensive Base-Band Processing center and macro cell base station, microcellular base station and distribute and management.Be specially, given frequency spectrum resource is divided into mutually orthogonal two parts by extensive Base-Band Processing center, and determine according to structure utility function the best proportion that system spectral resources is divided; Extensive Base-Band Processing center, according to the requirement of microcellular user signal interference ratio, is divided into two orthogonal frequency spectrum resource set to all microcellulars; Extensive Base-Band Processing center is according to the requirement of grand user's signal interference ratio, and service efficiency Probabilistic Decision-making, adjusts the affiliated frequency spectrum resource set of microcellular; The frequency spectrum resource that macrocell and the microcellular that belongs to two orthogonal frequency spectrum resource set use is determined at extensive Base-Band Processing center;

Fig. 3 gathers the reciprocal process of drawing time signal to microcellular, specifically comprises:

Macro base station radio-frequency front-end transmitting pilot signal; the detected value of user's signal interference ratio is sent to extensive Base-Band Processing center by microcellular; extensive Base-Band Processing center compares the detected value of microcellular user signal interference ratio and user's signal interference ratio threshold value, according to comparative result, microcellular is divided into mutually orthogonal frequency spectrum resource set F ₁or F ₂;

Grand user's transmitting pilot signal, set F ₁in microcellular grand user is produced to the size of interference according to reception input now, and send to grand user, grand user is according to receiving signal statistics set F ₁in the quantity of microcellular, send to microcellular, set F ₁in microcellular i calculate to use and share the probability of frequency spectrum, and probable value is sent to extensive Base-Band Processing center;

The order arrangement microcellular that extensive Base-Band Processing center reduces with probability, definite quantity that uses the microcellular of sharing frequency spectrum, and choose and arrange the forward shared frequency spectrum of microcellular use.

Fig. 4 is the instance graph that given frequency spectrum resource is divided, and particular content is:

Given frequency spectrum resource is divided into mutually orthogonal two parts S by extensive Base-Band Processing center _pand S _n,be set to respectively share frequency spectrum and special frequency spectrum, or by two parts frequency spectrum resource S _pand S _nbe set to respectively special frequency spectrum and shared frequency spectrum; And share spectrum resources is distributed to set K _sin microcellular and macrocell, special frequency spectrum resource is distributed to the microcellular of set in Kp.

Fig. 5 gathers the concrete implementation step of dividing to the microcellular in macrocell coverage area according to the requirement of user's signal interference ratio, specifically comprise:

Step 1: macro base station transmitting pilot signal, all microcellular user i will detect the signal interference ratio γ now obtaining _f, and send to extensive Base-Band Processing center (i);

Step 2: extensive Base-Band Processing center is according to the detected value of user's signal interference ratio and signal interference ratio threshold value

comparative result, microcellular is divided into different set.If

microcellular i belongs to set F ₁; If

microcellular i belongs to set F ₂.

Wherein, F ₁represent likely to use the set of the microcellular of sharing frequency spectrum, F ₂for likely using the set of microcellular of special frequency spectrum.

Provide step 103 below) use effectiveness Probabilistic Decision-making further to adjust the concrete implementation step of the affiliated frequency spectrum resource set kind of microcellular, as shown in Figure 6:

Step 1: grand user's transmitting pilot signal, set F ₁in microcellular i (i ∈ F ₁) grand user is produced to the big or small I of interference according to reception input now _i, and sending to grand user, grand user is according to receiving signal statistics set F ₁in the quantity n of microcellular _f, send to microcellular;

Step 2: set F ₁in microcellular i calculate to use and share the probability of frequency spectrum

and probable value is sent to extensive Base-Band Processing center, in extensive Base-Band Processing, collaborative calculating of Base-Band Processing server used the microcellular quantity of sharing frequency spectrum to be in the heart:

and microcellular is numbered to 1,2 ..., | F ₁|, wherein,

represent the interference value allowing under the certain signal interference ratio requirement of grand user;

Step 3: F will be gathered in extensive Base-Band Processing center ₁in the probable value of microcellular arrange with the order of successively decreasing, front | Ks| microcellular belongs to gathers K _suse and share frequency spectrum, residue | F ₁|-| K _s| individual microcellular and set F ₂in microcellular belong to set K _puse special frequency spectrum;

Step 4: wherein, described method is for single grand user's situation, and in the time that grand number of users is m, (n≤m) all adopt said method, extensive Base-Band Processing center arranges variables L (m, n to each grand user n _f) record adopts after said method grand user n, can using of obtaining shared the microcellular numbering (1 representative meets, and 0 representative does not meet) of frequency spectrum, and every row of variables L is added, and obtains a 1 row n _fthe row vector of row, wherein, the element position that value equals m is to belong to gathers K _suse share the microcellular numbering of frequency spectrum, all the other microcellulars belong to set K _puse special frequency spectrum.

In a word; the invention discloses double-layer network method for allocating dynamic frequency spectrums and system under a kind of base band centralized architecture; in this system, the baseband processing unit of macro cell base station and microcellular base station and spectrum management capability concentrate on extensive Base-Band Processing center, and the radio frequency unit of macro cell base station and microcellular base station is connected to extensive Base-Band Processing center by optical fiber.Based on this framework, frequency spectrum resource is divided into mutually orthogonal two parts; Microcellular in macrocell coverage area is divided to set; Adjust microcellular set dividing condition; Microcellular in different sets distributes different spectral resource.The present invention can effectively solve frequency spectrum resource distribution, the problem of management in double-deck cellular network, improves the spectrum utilization efficiency of double-layer network, suppresses the cross-layer co-channel interference between macrocell and microcellular, improves QoS of customer.

Above execution mode is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. the double-layer network method for allocating dynamic frequency spectrums under base band centralized architecture, the method is distributed for the frequency spectrum resource that solves macrocell and microcellular double-layer network, and described method comprises following steps:

Step 101) microcellular that is positioned at macrocell coverage area is divided into following set:

The microcellular that microcellular user signal interference ratio detected value is greater than to signal interference ratio threshold value is divided to the first microcellular set F ₁in, and the microcellular that microcellular user signal interference ratio detected value is less than signal interference ratio threshold value is divided to the second microcellular set F ₂in;

Step 102) given all frequency spectrum resource S are divided into mutually orthogonal two parts Sp and Sn, described Sp and Sn union are whole frequency spectrum resource S; Sp is set to share spectrum resources, simultaneously using Sn as special frequency spectrum resource; Or Sn is set to share spectrum resources, simultaneously using Sp as special frequency spectrum resource;

Obtaining according to the maximum principle of the average efficiency of all community users the ratio value that share spectrum resources accounts for whole frequency spectrum resource S is:

$v_s^{*}=\frac{1}{\frac{\left|F_2\right|}{|F_1+F_2|+\left|F_1\right|}+1}$

Step 103) share spectrum resources is distributed to the first microcellular set F ₁in microcellular and macrocell, special frequency spectrum resource is distributed to the second microcellular set F ₂in microcellular.

2. the double-layer network method for allocating dynamic frequency spectrums under base band centralized architecture according to claim 1, is characterized in that described step 101) and 102) between also comprise following steps:

According to the requirement of grand user's signal interference ratio, service efficiency Probabilistic Decision-making is is further optimized and revised the first microcellular set F ₁or the second microcellular set F ₂in each element, obtain the 3rd microcellular set K _swith the 4th microcellular set Kp;

Wherein, described the 3rd microcellular set K _sbe the first microcellular set F ₁proper subclass, described the 4th microcellular set Kp comprises: the second microcellular set F ₂when optimizing and revising from the first microcellular set F ₁the set that the community of middle deletion forms; When described efficiency Probabilistic Decision-making refers to the affiliated set of further adjustment microcellular, calculate respectively each microcellular in F1 and use the probability of sharing frequency spectrum, the microcellular that probability is larger uses the probability of shared frequency spectrum larger.

Now,

The shared ratio value of share spectrum resources is:

$v_s^{*}=\frac{1}{\frac{\left|K_p\right|}{|K_S+K_P|+\left|K_s\right|}+1}$

Described step 103) be:

Share spectrum resources is distributed to the 3rd microcellular set K _sin microcellular and macrocell, special frequency spectrum resource is distributed to the 4th microcellular set K _pin microcellular.

3. the double-layer network method for allocating dynamic frequency spectrums under base band centralized architecture according to claim 2, is characterized in that, described efficiency Probabilistic Decision-making specifically comprises following steps:

Step 201) certain grand user's transmitting pilot signal first, the first microcellular set F ₁in microcellular i grand user is produced to the big or small I of interference according to reception input now _i, and send to grand user, then grand user is according to receiving signal statistics set F ₁in the quantity n of microcellular _f, send to the first microcellular set F ₁in all microcellulars;

Step 202) adopt following formula to calculate the first microcellular set F ₁in the probability of shared frequency spectrum of each microcellular:

$p_s^W\left(i\right)=\min \{1,\frac{S_m^q}{n_F{I}_i}\},$

Step 202) choose share frequency spectrum probability larger before | Ks| microcellular is as the 3rd microcellular set K _sin element;

Described | Ks| adopts following formula to determine:

$\left|\mathrm{Ks}\right|=\left[\underset{i\&Element;F_1}{\mathrm{\&Sigma;}}{p}_s^W\left(i\right)\right]$

Step 203) by the first microcellular set F ₁in remaining " n _f-| K _s| " individual microcellular and the second microcellular set F ₂in all microcellulars as the element in the 4th microcellular set Kp.

4. the double-layer network method for allocating dynamic frequency spectrums under base band centralized architecture according to claim 3, is characterized in that, in the time that grand number of users is m, variables L (m, n is set _f) record obtains the 3rd microcellular set K after certain grand user n is adopted to said method _sand microcellular numbering in this set, and every row of variables L is added, obtain a 1 row n _fthe row vector of row, and the value element position that equals m is and belongs to the 3rd microcellular set K _suse share the microcellular numbering of frequency spectrum, all the other microcellulars belong to the 4th microcellular set K _puse special frequency spectrum, and m>1.

5. the double-layer network method for allocating dynamic frequency spectrums under base band centralized architecture according to claim 1, is characterized in that described step 101) further comprise following steps:

Step 101-1) macro base station transmitting pilot signal, all microcellular user i will detect the signal interference ratio γ now obtaining _f, and send to extensive Base-Band Processing center (i);

Step 101-2) extensive Base-Band Processing center is the detected value γ of user's signal interference ratio _f(i) with signal interference ratio threshold value

compare, if

microcellular i belongs to the first microcellular set F ₁in element; If

microcellular i belongs to the second microcellular set F ₂in element.

6. the double-layer network dynamic frequency spectrum deployment system under base band centralized architecture, described system comprises: extensive baseband and optical transport network; Macrocell intercoms by described optical transport network and described extensive baseband mutually with the microcellular in macrocell coverage area;

Described extensive baseband further comprises:

Frequency spectrum resource is divided module, for all frequency spectrum resources are divided into mutually orthogonal two parts, and optimize orthogonal two parts and account for the ratio of all frequency spectrum resources according to the maximum principle of the average efficiency of all community users, and using in orthogonal two parts wherein a part as shared frequency spectrum, another part is as special frequency spectrum;

Microcellular sort module, is divided to the first microcellular set F for the microcellular that microcellular user signal interference ratio detected value is greater than to signal interference ratio threshold value ₁in, and the microcellular that microcellular user signal interference ratio detected value is less than signal interference ratio threshold value is divided to the second microcellular set F ₂in;

Classification results is optimized and revised module, and for according to the requirement of grand user's signal interference ratio, service efficiency Probabilistic Decision-making is is further optimized and revised the first microcellular set F ₁or the second microcellular set F ₂in each element, obtain the 3rd microcellular set K _swith the 4th microcellular set Kp;

Resource distribution module, for being allocated to share spectrum resources the first microcellular set F ₁and macrocell, special frequency spectrum resource is distributed to the second microcellular set F simultaneously ₂; Or share spectrum resources is allocated to the 3rd microcellular set K _sand macrocell, special frequency spectrum resource is distributed to the 4th microcellular set Kp simultaneously.

7. the double-layer network dynamic frequency spectrum deployment system under base band centralized architecture according to claim 6, is characterized in that, described frequency spectrum resource is divided module and further comprised:

Processing module, for according to microcellular set dividing condition, calculates respectively share spectrum resources and special frequency spectrum resource and accounts for the ratio of whole resources;

Cut apart module, according to the ratio of sharing frequency spectrum and the shared whole resources of special frequency spectrum, whole frequency spectrum resources are divided into mutually orthogonal two parts.

8. the double-layer network dynamic frequency spectrum deployment system under base band centralized architecture according to claim 6, is characterized in that, described microcellular sort module further comprises:

Receiver module, detects the value of the signal interference ratio of the pilot signal of macro base station transmitting for receiving all microcellular users;

Relatively judging module, the signal interference ratio value that detection is obtained and the signal interference ratio threshold value of setting compare, and in the time that the former is greater than the latter, will be divided to the first microcellular set F corresponding to the microcellular of this detection signal interference ratio value ₁in, in the time that being less than the latter, the former is divided to the second microcellular set F corresponding to the microcellular of this detection signal interference ratio value ₂in.

9. the double-layer network dynamic frequency spectrum deployment system under base band centralized architecture according to claim 6, is characterized in that, described classification results is optimized and revised module and further comprised:

Statistical module, for adding up the first microcellular set F ₁in each microcellular use the probability of sharing frequency spectrum;

Effectiveness Probabilistic Decision-making module, by the first set F ₁in microcellular use the probable value of sharing frequency spectrum to arrange with the order of successively decreasing, and determine the size of the 3rd microcellular set Ks:

by front | Ks| microcellular is divided into the 3rd microcellular set K _s, residue | F ₁|-| K _s| individual microcellular and the second set F ₂in microcellular be divided into the 4th microcellular set K _pin.

10. the double-layer network dynamic frequency spectrum deployment system under base band centralized architecture according to claim 6, is characterized in that, described resource distribution module is to the first microcellular set F ₁in microcellular and macrocell distribute and use share spectrum resources, microcellular in the second microcellular set F2 is distributed and uses special frequency spectrum resource; Or to the 3rd microcellular set K _sin microcellular and macrocell distribute and use share spectrum resources, microcellular in the 4th microcellular set Kp is distributed and uses special frequency spectrum resource.

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