CN1964548A - A method for multiplexing of soft frequency - Google Patents

A method for multiplexing of soft frequency Download PDF

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Publication number
CN1964548A
CN1964548A CNA2005101155797A CN200510115579A CN1964548A CN 1964548 A CN1964548 A CN 1964548A CN A2005101155797 A CNA2005101155797 A CN A2005101155797A CN 200510115579 A CN200510115579 A CN 200510115579A CN 1964548 A CN1964548 A CN 1964548A
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user
subcarrier
base station
central area
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CN100466799C (en
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吴树兴
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The related flexible FDM method on directional antenna mode comprises: the RNC divides every sector into the main carrier and sub-carrier and determines the maximal emission power for sector according to business quantity; the BS determines the emission power for carriers, and communicates with user based on relative sub-carrier. This invention has well expansion, improves frequency source utility, and adjusts conveniently.

Description

The method of soft-frequency reuse
Technical field
The present invention relates to the communications field, relate in particular to a kind of method of soft-frequency reuse.
Background technology
The next generation mobile communication Technology Need is supported from speech, data, audio frequency, video, the multiple business type of extensive uses such as image.In order to support the polytype business, require the higher data rate of next generation mobile communication system support, higher spectrum efficiency, and require it to possess perfect QOS security mechanism, and provide better mobility support and network seamless to cover, be embodied as the target that the user provides communication service whenever and wherever possible.
Second generation mobile communication is with time division multiple access (TDMA) technology, and (as global system for mobile communications (GSM)) and Narrowband CDMA technology are main access technology.3G (Third Generation) Moblie is main access technology with Wideband CDMA Technology (as universal mobile telecommunications system (UMTS), broadband CDMA system (WCDMA)).In the middle of described CDMA (Code Division Multiple Access), a user data symbol will take all carrier frequency width, and different user or user data are distinguished by spreading code.Because multipath channel is destroyed orthogonality between the spreading code easily, makes CDMA technology become the system of a self-interference, so power system capacity and spectrum efficiency can't satisfy the requirement of broadband wireless communications.
In order to improve system of broadband wireless communication capacity and spectrum efficiency, multi-transceiver technology has appearred, and its basic thought is that a bandwidth carrier is divided into a plurality of subcarriers, and transmits data simultaneously on a plurality of subcarriers.In the middle of using, require the coherence bandwidth of the width of subcarrier less than system channel, the decline on each subcarrier is a flat fading like this, thereby can reduce intersymbol interference, and does not need complicated channel equalization, is fit to the transmission of high-speed data.Multi-transceiver technology has various ways, as OFDM (OFDMA), MC-CDMA (MC-CDMA), multicarrier direct sequency-code division multiple access (MC-DS-CDMA) technology, and time-frequency domain two-dimensional expansion technology, and multiple expansion technique on this basis.
Wherein, OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is more representational a kind of technology in the middle of the multi-transceiver technology, it is divided into many orthogonal sub-channels with given channel in frequency domain, and allow subcarrier spectrum to overlap, as long as satisfy between subcarrier mutually orthogonally, then can isolate data-signal from the subcarrier of aliasing.A basic OFDM modulation and demodulation process ofdm system block diagram as shown in Figure 1 comprises:
User data at first passes through chnnel coding and interleaving treatment, and adopts certain modulator approach, forms symbol as BPSK, QPSK, QAM etc.; Carry out the OFDM operation then, through being modulated on the radio frequency after the OFDM operation.Carrying out in the middle of the OFDM operating process, at first symbol is being carried out the serial conversion, forming the sub data flow of a plurality of low speed, each data flow takies a subcarrier.Sub data flow can be realized by an IDFT or IFFT to the mapping of subcarrier.It uses Cyclic Prefix (CP) as protection at interval simultaneously, significantly reduces, even eliminates intersymbol interference, and guaranteed the orthogonality of each interchannel, thereby significantly reduced interchannel interference.
Subsequently on the basis of multi-transceiver technology, the research of the method that strong multi-carrier modulation combines with CDMA has appearred successively, mainly be divided into two big classes at present: frequency domain expansion and time domain expansion, as shown in Figure 2:
User data through chnnel coding, interweaving and modulate the back forms symbol, the symbol of formation at first carried out frequency domain or time domain and expands before carrying out the OFDM operation.If only carry out frequency domain expansion, then be called MC-CDMA, if only carry out the time domain expansion, then be called MC-DS-CDMA.Under time domain and the simultaneous situation of frequency domain expansion, then be called the multi-transceiver technology of time-frequency domain two-dimensional expansion.
In the middle of the superincumbent introduction, the mapping of multicarrier realizes by inverse discrete fourier transform/inverse fast fourier transform (IDFT/IFFT), the overlapped and maintenance quadrature of frequency spectrum between each subcarrier, and use Cyclic Prefix to overcome intersymbol interference.In the middle of the OFDM technology, also can accelerate the attenuation outside a channel of subcarrier spectrum by the method for windowing, also exist some technological means to avoid using the recycling-guard prefix.Therefore, one more the multicarrier system of broad sense system block diagram as shown in Figure 3, its basic principle is as follows:
User data at first passes through modulation treatment.This modulation treatment may comprise chnnel coding, interweaves, symbol-modulated and operations such as time domain and frequency domain expansion, the data that obtain are after going here and there and changing, being mapped to a plurality of subcarriers with certain technological means gets on, these subcarriers can be quadratures, also can be nonopiate, get on through being modulated to radio frequency after the parallel/serial conversion.
Prior art one related to the present invention, it is the scheme that adopts under antenna mode based on the soft-frequency reuse of multi-transceiver technology.Its main thought is:
Because cell edge is to disturb worst zone, therefore in the middle of the operation of reality, terminal can be in the center of sub-district near base station location.So on the one hand from the signal power of this sub-district than higher, less from the interference ratio of adjacent sub-district on the other hand, therefore can obtain than higher signal to noise ratio.This just means, the frequency of adjacent sub-district can be used in the central area in the sub-district, realizes the communication of two-forty, and specifically scheme is as shown in Figure 4:
User 11 and 12 belongs to base station 1, and user 21 and 22 belongs to base station 2, and user 31 and 32 belongs to base station 3.The user 11,21, and 31 are positioned at the fringe region of three sub-districts, terminal 12,22, and 32 near this cell-site antenna, promptly is positioned at the central area of sub-district.
The subcarrier that distributes different frequency for the user who is positioned at cell edge region; The user who is positioned at the center of housing estate zone is adopted the method for limit transmit power.So, form following programme:
For the user who is positioned at cell edge region, using the multiplexing factor is 3 frequency planning scheme, and for the area near the base station, adopting the multiplexing factor is 1 scheme.And the user of the central area of sub-district adopted the method for limit transmit power, form the multiplexing factor and be 1 isolated island and cover.
By the technical scheme of prior art as can be seen, it is realized based on multicarrier system under the omnidirectional antenna pattern, and actual multicarrier system is to dispose under the sector of directional aerial mostly, so there is following technological deficiency in prior art:
Prior art does not propose under directional antenna patterns how the user under the sector to be carried out the scheme of subcarrier allocation, and therefore for the great majority of the present existence multicarrier system based on the sector deployment directional aerial under, its practicality is restricted, and is unsuitable for expanding.
Summary of the invention
The method that the purpose of this invention is to provide a kind of soft-frequency reuse by the present invention, can be carried out subcarrier allocation to the user based on the multicarrier system of disposing under the directional antenna patterns, the requirement of more realistic system, thus autgmentability is better.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides the method for the soft-frequency reuse under a kind of directional antenna patterns, it comprises:
A, under the directional antenna patterns of multicarrier system, each sector is carried out the division of major-minor subcarrier by base station controller RNC, and determine the maximum transmission power of each sector, and determine the transmitting power of corresponding major-minor subcarrier by the base station according to the traffic carrying capacity of each sector;
Communicate based on the respective sub of distributing between B, base station and user.
Wherein, described steps A specifically comprises:
Under the directional antenna patterns of multicarrier system, by the network planning base station controller RNC major-minor subcarrier of each sector is divided, and determine the maximum transmission power of each sector according to the traffic carrying capacity of each sector, the base station is according to the central area and fringe region number of users or the number of services that are in the sector, and the power proportions of major-minor subcarrier and the maximum transmission power of this sector are determined the transmitting power of corresponding major-minor subcarrier.
Wherein, described steps A specifically comprises:
A1, under the directional antenna patterns of multicarrier system, the base station is divided into mutual nonoverlapping N group according to number of sectors N in the multicarrier system with the subcarrier of each sector, and selection one group of boss's carrier wave as this sector wherein, other subcarrier is as the auxiliary son carrier waves of this sector;
A2, base station controller RNC are obtained the number of users of central area and fringe region in each sector;
A3, after RNC is known the number of users of each sector according to the number of users of described central area and fringe region, then determine the maximum transmission power of described sector according to the maximum transmission power of the number of users of described each sector and base station, the maximum transmission power with described sector is notified to the base station then;
A4, described base station be according to the number of users or the number of services decision major-minor sub-carrier power ratio of this central area, sector and fringe region, and the transmitting power of calculating and obtain the major-minor subcarrier according to the maximum transmission power and the major-minor sub-carrier power ratio of described sector.
Wherein, between described steps A 2 and steps A 3, also comprise:
A5, the traffic carrying capacity of central area and the traffic carrying capacity of fringe region are compared, when the ratio of the traffic carrying capacity of confirming fringe region and the traffic carrying capacity of central area during greater than 1/N, then select in this sector auxiliary son carrier waves with other sector minimum auxiliary son carrier waves that overlaps, and improve the transmitting power of its transmitting power to main carrier, make it be converted to boss's carrier wave.
Wherein, described steps A 1 also comprises:
For selecting different boss's carrier waves in adjacent sector.
Wherein, before described steps A 2, also comprise:
A21, RNC know that according to the information of each reporting of user the central area that described user belongs to sector, user place still belongs to fringe region;
A22, belong to the central area of sector, user place or the information of fringe region is calculated, obtain the number of users of central area and fringe region in the sector according to the described described user who learns.
Wherein, described steps A 21 specifically comprises:
A211, user calculate and oneself belong to fringe region or belong to the central area, and result of calculation is reported RNC;
A212, RNC know that according to the information of each reporting of user the central area that described user belongs to sector, user place still belongs to fringe region;
Or,
A213, user's real-time report metrical information are given RNC;
A214, RNC calculate according to the metrical information of each reporting of user and know that the central area that described user belongs to sector, user place still belongs to fringe region.
Wherein, in the steps A 3, before the maximum transmission power of the sector that will determine is notified to the process of base station, also comprise:
Every certain time interval, upgrade according to the maximum transmission power of described each sector state of affairs to the sector.
Wherein, described steps A 4 specifically comprises:
Described base station is periodically according to the state of affairs of fringe region current in the described sector and central area decision major-minor sub-carrier power ratio, and according to the maximum transmission power of described sector, major-minor sub-carrier power than and the quantity of major-minor subcarrier calculate and obtain the transmitting power of major-minor subcarrier.
Wherein, described step B specifically comprises:
B1, when the user enters certain sector, the base station is with the major-minor subcarrier division information of this sector, and the transmitting power of major-minor subcarrier sends to described user;
B2, after the transmission of user success request for data, measures the adjacent sectors pilot signal strength, and determine that according to pilot frequency intensity it belongs to the central area and still belongs to fringe region, and the channel quality indicator (CQI) value of selecting corresponding subcarrier is to the base station;
Or,
After the transmission of user success request for data, the CQI value of all subcarriers is reported the base station;
B3, base station are according to the CQI value of reporting of user subcarrier, described user's priority and user's area identification, and corresponding dispatching principle is dispatched the user that corresponding subcarrier is given correspondence;
Communicate based on described subcarrier between B4, base station and user.
Wherein, before described step B3, comprise:
The base station masks corresponding bit error rate by the bit error rate of the subcarrier of measurement than higher subcarrier.
Wherein, among the step B3, described dispatching principle specifically comprises
For the user of fringe region, priority scheduling boss's carrier wave is given described user; If boss's carrier wave is all occupied, and there is idle auxiliary son carrier waves, then dispatches corresponding auxiliary son carrier waves and give described user; In all fringe region users, the user that priority is high is scheduled earlier, according to the CQI value of the subcarrier of described reporting of user, selects the subcarrier of CQI value maximum to dispatch in the equal priority;
And,
For the central area user, the priority scheduling auxiliary son carrier waves is given described user; If auxiliary son carrier waves is all occupied, and there is idle boss's carrier wave, then dispatches corresponding boss's carrier wave and give described user; In all central area users, the user that priority is high is scheduled earlier, according to the CQI value of the subcarrier of described reporting of user, selects the subcarrier of CQI value maximum to dispatch in the equal priority.
Wherein, described multicarrier system comprises:
Comprise OFDM OFDMA, MC-CDMA MC-CDMA, multicarrier direct sequency-code division multiple access MC-DS-CDMA, multicarrier time-division multiple access MC-TDMA or multifrequency code division multiple access MTCDMA system.
As seen from the above technical solution provided by the invention, method of the present invention is under the directional antenna patterns of multicarrier system, by base station controller RNC each sector is carried out the division of major-minor subcarrier by the network planning, and determine the maximum transmission power of each sector, and determine the transmitting power of corresponding major-minor subcarrier by the base station according to the traffic carrying capacity of each sector; Communicate based on the respective sub of distributing between base station and user then.The present invention is based on the multicarrier system of disposing under the directional antenna patterns user is carried out subcarrier allocation, the requirement of more realistic system, thus autgmentability is better; In addition, the subcarrier that the present invention distributes different capacity for the zones of different user, and because the rate of the reusing difference of zones of different subcarrier (the rate height is reused in the central area, and it is low that fringe region is reused rate), thereby can improve frequency spectrum resource utilization rate; And the present invention determines the power ratio of major-minor subcarrier according to central area in the sector and fringe region number of users, so can be along with the traffic carrying capacity of current sector is regulated.
Description of drawings
Fig. 1 is the system block diagram of ofdm system in the background technology;
Fig. 2 is the system block diagram of time-domain and frequency-domain two-dimensional expansion multicarrier system in the background technology;
Fig. 3 is the The general frame of multicarrier system in the background technology;
Fig. 4 is the networking schematic diagram of multi-transceiver technology under the soft-frequency reuse method in the prior art one;
The flow chart of first embodiment that provides of the present invention is provided Fig. 5;
Fig. 6 is soft-frequency reuse scheme boss allocation of carriers schematic diagram under 3 fan antennas among the present invention.
Embodiment
The invention provides a kind of method of soft-frequency reuse, its core is: under the directional antenna patterns of multicarrier system, by base station controller RNC each sector is carried out the division of major-minor subcarrier by the network planning, and determine the maximum transmission power of each sector, and determine the transmitting power of corresponding major-minor subcarrier by the base station according to the traffic carrying capacity of each sector; Communicate based on the respective sub of distributing between base station and user then.
First embodiment provided by the invention as shown in Figure 5, comprising:
Step 11, under the directional antenna patterns of multicarrier system, (RNC) carries out the division of major-minor subcarrier by network planning base station controller, and determines by netinit.
When the subcarrier of each sector was divided, the principle of following was as follows:
Subcarrier in each sector is divided into mutual nonoverlapping N group according to the number of sectors in the multicarrier system, and in each sector, selects one group of boss's carrier wave as this sector wherein, other subcarrier is as the auxiliary son carrier waves of this sector.
For the interference of more effective minimizing minizone, the principle of being followed also comprises: different boss's carrier waves need be selected in adjacent sector.
Suppose that as shown in Figure 6 each divides into three sectors for a short time, all subcarriers can be distributed in each sector, suppose that whole subcarriers are 300, are boss's carrier wave with 100 subcarriers wherein then, and remaining is as auxiliary son carrier waves.
Make boss's carrier wave of adjacent sectors mutually orthogonal, and distribute to the unique logical number of each subcarrier, the subcarrier that logical number is identical means that they are identical subcarriers.
Describe for convenient, use the subcarrier of like-identified to represent identical boss's carrier set, the different different boss's carrier set of sign representative.For example, center cell at Fig. 6, the sector mark that is designated the A place is sector1, be designated the subcarrier set that the A presentation logic is numbered No. 1 to No. 100, it is this sector boss's carrier set, being designated B place sector mark is sector2, be designated the subcarrier set that the B presentation logic is numbered No. 101 to No. 200, it is this sector boss's carrier set, the sector mark that is designated the C place is sector3, be designated the C presentation logic and number No. 201 to No. 300 subcarrier set, be this sector boss's carrier set.
Step 12, base station controller (RNC) know that according to the information of each reporting of user the central area that described user belongs to sector, user place still belongs to fringe region.
Specifically comprise two kinds of situations, one is:
At first, the user calculates and oneself belongs to fringe region or belong to the central area, and result of calculation is reported RNC.
Wherein the user calculates and oneself belongs to fringe region or the process that belongs to the central area is specially:
The user measures the pilot signal of the base station under the adjacent sectors, choose three the strongest pilot signals, remove other two pilot signal strength sums with wherein the strongest pilot signal strength, the value that obtains is made as ρ, (this parameter is determined when the network planning with network parameter ρ, send to the user by broadcast control information, the scale of exterior domain in its decision, this parameter is greater than 0, and less than 2) compare, if ρ '＞ρ, then this user belongs to fringe region, otherwise this user belongs to interior zone.
Then, RNC knows that according to the information of each reporting of user the central area that described user belongs to sector, user place still belongs to fringe region.
It two is:
At first, user's real-time report metrical information is given RNC; Then, RNC calculates according to the metrical information of each reporting of user and knows that described user belongs to the central area and still belongs to fringe region.
Detailed process is:
The user measures the pilot signal of the affiliated base station of adjacent sectors, report RNC, RNC chooses three the strongest pilot signals, removes other two pilot signal strength sums with wherein the strongest pilot signal strength, the value that obtains is made as ρ ', with network parameter ρ (this parameter is determined when the network planning, the scale of exterior domain in its decision, this parameter is greater than 0, and less than 2) compare, if ρ '＞ρ, then this user belongs to fringe region, otherwise this user belongs to interior zone.
Step 13, RNC belongs to the central area of sector, user place according to the described described user who learns or the information of fringe region is calculated, and obtains the number of users of central area and fringe region in the sector.
Number of users in each sector is calculated and obtained to step 14, RNC according to the number of users of central area or fringe region.
After step 15, RNC are known the number of users of each sector according to the number of users of described central area and fringe region, then determine the maximum transmission power of described sector according to the maximum transmission power of the number of users of described each sector and base station, and every certain time interval, upgrade according to the maximum transmission power of the state of affairs in the described sector to the sector, the maximum transmission power with described sector is notified to the base station then.
For example, RNC at first calculates the mean value of number of users in all sectors, then, with this mean value divided by the number of users in this sector, at last, the quotient that obtains is taken advantage of half of maximum transmission power of this base station transmitter, as the maximum transmission power of this sector, if should be worth maximum transmission power, then get the maximum transmission power of the maximum transmission power of base station transmitter as this sector greater than base station transmitter.
Step 16, described base station be periodically according to the number of users of fringe region current in each sector and central area or number of services (can obtain this numerical value from admitting control) decision major-minor sub-carrier power ratio, and according to the maximum transmission power of described sector and major-minor sub-carrier power than the transmitting power of calculating and obtain the major-minor subcarrier.
The process of calculating major-minor sub-carrier power ratio is as follows:
The base station that RNC informs its place with the fringe region number of users and the central area number of users of each sector;
Each base station with total number of users of its sector, place divided by the central area number of users, with the value that obtains as major-minor sub-carrier power ratio.
Or,
RNC is the fringe region number of users and the central area number of users of each sector, and each user carries out the ratio of different kinds of business, informs the base station at its place;
Each base station is according to the ratio of the described number of users of knowing, class of business and different kinds of business, calculate and obtain the fringe region number of users of each sector and the business proportion of central area, total number of services of using its sector, place then is divided by the central area number of services, with the value that obtains as major-minor sub-carrier power ratio.
Utilize following formula that the transmitting power of major-minor subcarrier is calculated:
Step 17, when the user enters certain sector, the base station is with the major-minor subcarrier division information of this sector, and the transmitting power of major-minor subcarrier sends to described user.
The transmission of user's request msg, if RNC response this application, then user applies success just can communicate process between base station and user then, and is specific as follows:
Step 18, after the transmission of user success request for data, measures the adjacent sectors pilot signal strength, and determine that according to pilot frequency intensity it belongs to the central area and still belongs to fringe region, and the channel quality indicator (CQI) value of selecting corresponding subcarrier is to the base station; Or, after the transmission of user success request for data, the CQI value of all subcarriers is reported the base station.
The user measures the adjacent sectors pilot signal strength, determine that according to pilot frequency intensity this user belongs to the central area and still belongs to fringe region (both can be at one's leisure also can carrying out when the transfer of data), belong to the central area user according to this user then or belong to fringe region and determine to report corresponding boss's carrier wave or report the CQI (channel quality indication) of corresponding auxiliary son carrier waves to give the base station that perhaps all the CQI value of subcarriers reports the base station.
Step 19, base station are according to the CQI value of reporting of user subcarrier, described user's priority and user's area identification, and corresponding dispatching principle is dispatched the user that corresponding subcarrier is given correspondence.
Described dispatching principle specifically comprises:
For the user of fringe region, priority scheduling boss's carrier wave is given described user; If boss's carrier wave is all occupied, and there is idle auxiliary son carrier waves, then dispatches corresponding auxiliary son carrier waves and give described user; In all fringe region users, the user that priority is high is scheduled earlier, according to the CQI value of the subcarrier of described reporting of user, selects the subcarrier of CQI value maximum to dispatch in the equal priority;
And,
For the central area user, the priority scheduling auxiliary son carrier waves is given described user; If auxiliary son carrier waves is all occupied, and there is idle boss's carrier wave, then dispatches corresponding boss's carrier wave and give described user; In all central area users, the user that priority is high is scheduled earlier, according to the CQI value of the subcarrier of described reporting of user, selects the subcarrier of CQI value maximum to dispatch in the equal priority.
Communicate based on described subcarrier between step 20, base station and user.
When by downlink transmission data, the base station sends data to the user according to described subcarrier and corresponding power, and the user receives data simultaneously.
When by the ul transmissions data, the user sends data to the base station according to described subcarrier and corresponding power, and the base station receives data simultaneously.
Second embodiment provided by the invention, its main thought is: when the traffic carrying capacity of edge customer is bigger, for example, when the ratio of the traffic carrying capacity of fringe region and the traffic carrying capacity of central area during greater than 1/N (N is the number of sector), each sector can be increased to the nominal power that is used for central area user's auxiliary son carrier waves the nominal power of boss's carrier wave, and be translated into the main carrier use, make it serve edge customer.
In specific implementation process, the difference of itself and first embodiment is:
Distinguish 1, between step 13 and step 14, also comprise:
The traffic carrying capacity of central area and the traffic carrying capacity of fringe region are compared, when the ratio of the traffic carrying capacity of confirming fringe region and the traffic carrying capacity of central area during greater than 1/N, then select in this sector auxiliary son carrier waves with other sector minimum auxiliary son carrier waves that overlaps, and improve the transmitting power of its transmitting power to main carrier, make it be converted to boss's carrier wave.
Concrete assigning process is as follows:
The nominal transmitting power that will be in the auxiliary son carrier waves of the logical number 101 to 300 in the sector that is designated A is brought up to the nominal transmitting power of boss's carrier wave, changes boss's carrier wave into and comes the service for the user, and described auxiliary son carrier waves is used as boss's carrier wave distributes.
In described auxiliary son carrier waves being used as the process that boss's carrier wave distributes, to distribute from little logic number for the subcarrier of logical number 101 to 200 and the subcarrier of logical number 201 to 300, and number 101 to 200 and numbering 201 to 300 subcarrier to hocket.
For example, after assignment logic was numbered 101 subcarrier, then assignment logic was numbered 201 subcarrier, and then assignment logic is numbered 102 subcarrier, and the logical number of then reallocating is 202 subcarrier, or the like the distribution that so hockets.Also carry out according to this principle other sector that sign A represents.
The nominal transmitting power that the nominal transmitting power that will be in the auxiliary son carrier waves of logical number 1 to 100 in the sector that is designated B and logical number 201 to 300 is brought up to boss's carrier wave can change boss's carrier wave into, come service, and described auxiliary son carrier waves is used as boss's carrier wave distributes for the user.
In described auxiliary son carrier waves being used as the process that boss's carrier wave distributes, for logical number is that 1 to 100 subcarrier will begin to distribute from little logic number, and 201 to 300 will begin to distribute from big logical number, and 1 to 100 and 201 to 300 also will hocket.
For example, at first assignment logic is numbered 1 subcarrier, and then assignment logic is numbered 300 subcarrier, and assignment logic is numbered 2 subcarrier then, and the logical number of then reallocating is 299 subcarrier, so hockets and distributes or the like.Other sector of representing of sign B also successively principle carry out.
The nominal transmitting power that will be in logical number in the sector that is designated C and be 1 to 200 auxiliary son carrier waves is brought up to the nominal transmitting power of boss's carrier wave, changes boss's carrier wave into, comes the service for the user, and auxiliary son carrier waves is used as boss's carrier wave distributes.
In auxiliary son carrier waves being used as the process that boss's carrier wave distributes, be that 1 to 100 subcarrier and logical number are 101 to 200 subcarrier for logical number, all to begin from big logical number to distribute, and the distribution that hockets.
For example, at first assignment logic is numbered 100 subcarrier, and then assignment logic is numbered 200 subcarrier, and assignment logic is numbered 99 subcarrier then, and then assignment logic is numbered 199 subcarrier, the distribution that so hockets, or the like.
The difference 2, in the step 18 of first embodiment, only comprise following content:
After the transmission of user success request for data, the CQI value of all subcarriers is reported the base station.
Related content among other and first embodiment is identical, is not described in detail.
The 3rd embodiment that the present invention passes through, be on the basis of first, second embodiment provided by the invention, by the bit error rate of each subcarrier of base station measurement, in subcarrier allocation or dispatching algorithm, avoid using bit error rate, thereby can obtain higher performance than higher subcarrier.
The difference of itself and last two embodiment provided by the invention is as follows:
, dispatch corresponding subcarrier and give before user's the process according to the CQI value of reporting of user subcarrier, user's priority and user's area identification in the base station, also comprise:
The base station masks corresponding bit error rate by the bit error rate of the subcarrier of measurement than higher subcarrier.
Related content among other and first embodiment is identical, is not described in detail.
Multicarrier system in the foregoing description comprises: OFDM (OFDMA), MC-CDMA (MC-CDMA), multicarrier direct sequency-code division multiple access (MC-DS-CDMA), multicarrier time-division multiple access (MC-TDMA) or multifrequency code division multiple access (MT-CDMA) system.
As seen from the above technical solution provided by the invention, method of the present invention is under the directional antenna patterns of multicarrier system, RNC carries out the division of major-minor subcarrier to each sector, and determine the maximum transmission power of each sector according to the business proportion of each sector, the base station is according to the central area and the fringe region number of users that are in the sector, and the power proportions of major-minor subcarrier and the maximum transmission power of this sector are determined the transmitting power of corresponding major-minor subcarrier; The information based on corresponding subcarrier communicates between base station and user then.Among the present invention, according to the subcarrier of sending different capacity for the zones of different user, and the rate of the reusing difference of zones of different subcarrier (the rate height is reused in the central area, and it is low that fringe region is reused rate), thereby can improve frequency spectrum resource utilization rate; And the present invention determines the power ratio of major-minor subcarrier according to central area in the sector and fringe region number of users relation, so can be along with the traffic carrying capacity of current sector is regulated; Based on the multicarrier system of disposing under the directional antenna patterns user is carried out subcarrier allocation, the requirement of more realistic system, thus autgmentability is better.
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 (13)

1, the method for the soft-frequency reuse under a kind of directional antenna patterns is characterized in that, comprising:
A, under the directional antenna patterns of multicarrier system, each sector is carried out the division of major-minor subcarrier by base station controller RNC, and determine the maximum transmission power of each sector, and determine the transmitting power of corresponding major-minor subcarrier by the base station according to the traffic carrying capacity of each sector;
Communicate based on the respective sub of distributing between B, base station and user.
2, method according to claim 1 is characterized in that, described steps A specifically comprises:
Under the directional antenna patterns of multicarrier system, each sector is carried out the division of major-minor subcarrier by network planning base station controller RNC, and determine the maximum transmission power of each sector according to the traffic carrying capacity of each sector, the base station is according to the central area and fringe region number of users or the number of services that are in the sector, and the power proportions of major-minor subcarrier and the maximum transmission power of this sector are determined the transmitting power of corresponding major-minor subcarrier.
3, method according to claim 1 and 2 is characterized in that, described steps A specifically comprises:
A1, under the directional antenna patterns of multicarrier system, the base station is divided into mutual nonoverlapping N group according to number of sectors N in the multicarrier system with the subcarrier of each sector, and selection one group of boss's carrier wave as this sector wherein, other subcarrier is as the auxiliary son carrier waves of this sector;
A2, base station controller RNC are obtained the number of users of central area and fringe region in each sector;
A3, after RNC is known the number of users of each sector according to the number of users of described central area and fringe region, then determine the maximum transmission power of described sector according to the maximum transmission power of the number of users of described each sector and base station, the maximum transmission power with described sector is notified to the base station then;
A4, described base station be according to the number of users or the number of services decision major-minor sub-carrier power ratio of this central area, sector and fringe region, and the transmitting power of calculating and obtain the major-minor subcarrier according to the maximum transmission power and the major-minor sub-carrier power ratio of described sector.
4, method according to claim 3 is characterized in that, also comprises between described steps A 2 and steps A 3:
A5, the traffic carrying capacity of central area and the traffic carrying capacity of fringe region are compared, when the ratio of the traffic carrying capacity of confirming fringe region and the traffic carrying capacity of central area during greater than 1/N, then select in this sector auxiliary son carrier waves with other sector minimum auxiliary son carrier waves that overlaps, and improve the transmitting power of its transmitting power to main carrier, make it be converted to boss's carrier wave.
5, method according to claim 3 is characterized in that, described steps A 1 also comprises:
For selecting different boss's carrier waves in adjacent sector.
6, method according to claim 3 is characterized in that, also comprises before described steps A 2:
A21, RNC know that according to the information of each reporting of user the central area that described user belongs to sector, user place still belongs to fringe region;
A22, belong to the central area of sector, user place or the information of fringe region is calculated, obtain the number of users of central area and fringe region in the sector according to the described described user who learns.
7, method according to claim 6 is characterized in that, described steps A 21 specifically comprises:
A211, user calculate and oneself belong to fringe region or belong to the central area, and result of calculation is reported RNC;
A212, RNC know that according to the information of each reporting of user the central area that described user belongs to sector, user place still belongs to fringe region;
Or,
A213, user's real-time report metrical information are given RNC;
A214, RNC calculate according to the metrical information of each reporting of user and know that the central area that described user belongs to sector, user place still belongs to fringe region.
8, method according to claim 3 is characterized in that, in the steps A 3, before the maximum transmission power of the sector that will determine is notified to the process of base station, also comprises:
Every certain time interval, upgrade according to the maximum transmission power of described each sector state of affairs to the sector.
9, method according to claim 3 is characterized in that, described steps A 4 specifically comprises:
Described base station is periodically according to the state of affairs of fringe region current in the described sector and central area decision major-minor sub-carrier power ratio, and according to the maximum transmission power of described sector, major-minor sub-carrier power than and the quantity of major-minor subcarrier calculate and obtain the transmitting power of major-minor subcarrier.
10, method according to claim 1 and 2 is characterized in that, described step B specifically comprises:
B1, when the user enters certain sector, the base station is with the major-minor subcarrier division information of this sector, and the transmitting power of major-minor subcarrier sends to described user;
B2, after the transmission of user success request for data, measures the adjacent sectors pilot signal strength, and determine that according to pilot frequency intensity it belongs to the central area and still belongs to fringe region, and the channel quality indicator (CQI) value of selecting corresponding subcarrier is to the base station;
Or,
After the transmission of user success request for data, the CQI value of all subcarriers is reported the base station;
B3, base station are according to the CQI value of reporting of user subcarrier, described user's priority and user's area identification, and corresponding dispatching principle is dispatched the user that corresponding subcarrier is given correspondence;
Communicate based on described subcarrier between B4, base station and user.
11, method according to claim 10 is characterized in that, comprises before described step B3:
The base station masks corresponding bit error rate by the bit error rate of the subcarrier of measurement than higher subcarrier.
12, method according to claim 10 is characterized in that, among the step B3, described dispatching principle specifically comprises
For the user of fringe region, priority scheduling boss's carrier wave is given described user; If boss's carrier wave is all occupied, and there is idle auxiliary son carrier waves, then dispatches corresponding auxiliary son carrier waves and give described user; In all fringe region users, the user that priority is high is scheduled earlier, according to the CQI value of the subcarrier of described reporting of user, selects the subcarrier of CQI value maximum to dispatch in the equal priority;
And,
For the central area user, the priority scheduling auxiliary son carrier waves is given described user; If auxiliary son carrier waves is all occupied, and there is idle boss's carrier wave, then dispatches corresponding boss's carrier wave and give described user; In all central area users, the user that priority is high is scheduled earlier, according to the CQI value of the subcarrier of described reporting of user, selects the subcarrier of CQI value maximum to dispatch in the equal priority.
13, method according to claim 1 and 2 is characterized in that, described multicarrier system comprises:
OFDM OFDMA, MC-CDMA MC-CDMA, multicarrier direct sequency-code division multiple access MC-DS-CDMA, multicarrier time-division multiple access MC-TDMA or multifrequency code division multiple access MT-CDMA system.
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