CN1917388B - Distribution type antenna system, and communication method - Google Patents
Distribution type antenna system, and communication method Download PDFInfo
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- CN1917388B CN1917388B CN2005100908262A CN200510090826A CN1917388B CN 1917388 B CN1917388 B CN 1917388B CN 2005100908262 A CN2005100908262 A CN 2005100908262A CN 200510090826 A CN200510090826 A CN 200510090826A CN 1917388 B CN1917388 B CN 1917388B
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Abstract
The antenna system thereof is base on cell architecture; each cell comprises a CPU, multi wireless access units and transmission link; the multi wireless access units are respectively connected to the CPU through their own transmission link. Wherein, the wireless access unit comprises a duplexer and an antenna mounted on it; the CPU comprises a path loss estimator, a resource allotter, a transmission processor, a wireless access unit selector and a RF link group.
Description
Technical field
The present invention relates to a kind of multiaerial system and communication means thereof, particularly relate to a kind of distributing antenna system and communication means thereof, this distributing antenna system and communication means can be selected optimum Wireless Access Unit at certain user, thereby offer the best power system capacity.
Background technology
Following wireless communication system need be supported the very data service of two-forty, such as video conference, video request program, interactive entertainment or the like.According to the requirement of mentioning in the ITU-R M1645 file:, need to support to be up to the speed of 100Mbps for high-speed radio business (High Mobility); And, more need to reach the speed of 1Gbps for low speed (Low Mobility) or fixed wireless (Fixed wireless) business.Simultaneously, as a wireless communication system, it is the coverage rate of necessary assurance system also, and the service of high data rate can be provided with any time anywhere for Any user.
Analyze and find, for high link rate like this, user's coverage is a very serious problem.Two following reasons specifically can be arranged:
A. the speed that will support of Wei Lai system is very high, even prior art can realize very high spectrum efficiency, but needs a bigger bandwidth support that present experimental system is used is descending 100MHz, the bandwidth of up 40MHz.In order to hold this system, have to use frequency band, such as 10GHz than higher.Signal (for example, GSM, 1GHz with respect to lower band; WCDMA, 2GHz), what the path loss of high-frequency signal (Path Loss below is abbreviated as P1) will be big is many, and under same transmitting power situation, the transmission range of high-frequency signal can reduce greatly.
B. along with the increase of the data rate of system, the reduction that every bit signal to noise ratio (SNR/bit) that same transmitting power can realize will be inversely proportional to.And user's performance and every bit signal to noise ratio have direct relation.Certainly, also can satisfy same coverage by the transmitting power that increases system.But consider the health effect of radio wave to human body, the transmitting power of base station need be limited within certain scope.Like this, under same power-limiting, the coverage of signal also can reduce greatly.Under above-mentioned situation, traditional cellular system has only the covering of the system that realizes by the method for cell division.Like this, thereby can cause on the one hand rolling up of system infrastructure to cause investment to increase, on the other hand because dwindling of sub-district area caused user's ordinary sub-district switching in moving.
In order to address this problem, two kinds of new network configurations have been proposed.A network configuration that is based on forwarding and multi-hop structure (Relay and Multi-Hop Structure), another is based on distributing antenna system (Distributed Antenna System, network configuration DAS).Here, owing to only be at the network configuration based on distributing antenna system among the present invention, therefore, for not describing based on the network system of forwarding and multi-hop structure.
For distributing antenna system, list of references [1], " A.A.M.Saleh; A.J.Rustako, andR.S.Roman " .Distributed antennas for indoor radio communications, " IEEETrans.On Communications; Vol.35; pp.1245-1251, Dec.1987 ", disclosed a kind of distributing antenna system the earliest.Wherein, wireless signal is sent to a distant place by coaxial cable simply, goes out by one or more antenna transmission then, and these antenna can be serially connected on the coaxial cable simultaneously.In the time of more, may spread a coaxial cable exactly, little opening is set so that wireless signal leaks in corresponding place to cable then, here, these openings just are equivalent to be used to launch the miniature antenna of wireless signal.
Under this situation, transmitting of many antennas is same signal in fact, and its effect mainly is to make indoor signal to mobile system to cover.Usually, this distributing antenna system is called passive distributed antenna system (Passive DAS), and the system performance gain that it can provide is very limited.
Afterwards because going deep into to multi-input multi-output system (MIMO) research, a kind of active distributed formula antenna system (Active DAS) has been proposed, see also list of references [2], " Troels B.Sorensen; " Intelligent Distributed Antenna System. " Ph.D thesis, 2003 ".In this distributing antenna system, many antennas of system end are not installed concentratedly on a center base station, and are installed in respectively on the different local little base stations that are evenly distributed in the sub-district.The radiofrequency signal that every antenna will be launched/be received by optical fiber from the reception/transmission of base station signal processing unit.
Fig. 1 has provided a kind of schematic diagram of active distributed formula antenna system.In order to be different from traditional network configuration, the little base station that Anneta module will be installed here is called Wireless Access Unit (Radio Access Unit, RAU), signal processing module is called CPU (Central Unit, CPU), wherein, many independently antennas can be installed on each Wireless Access Unit.For such system, as long as Wireless Access Unit has duplexer, radiofrequency signal optical-electrical converter, emitting radio frequency signal power amplifier just passable.Other all base station units comprise as above/low-converter, encoder, modulator, processor etc. all concentrates on CPU when empty.Discover that (Centralized Antenna System, CAS), distributing antenna system can finely be finished the covering of system signal, and can reduce the transmitting power of signal greatly than central antenna system.
Fig. 1 is the structural representation of a sub-district in the distributing antenna system.For such system, the problem that has needs to solve is: when a user will insert this system, select which Wireless Access Unit to communicate with it on earth.
For up link,,, all be that the raising to systematic function is useful on the theory no matter how low the energy of this signal is as long as Wireless Access Unit can receive user's signal.
And, under the situation that keeps equal transmit power, select more Wireless Access Unit to serve the performance that a user not necessarily can improve system for down link.This be because: for central antenna system, increasing the performance that transmitting antenna can increase system, is the same but prerequisite is each transmitting antenna to user's path loss.But for distributing antenna system, because antenna is distributed in different places, the distance between each Wireless Access Unit and the user is different, and it is different causing corresponding path loss thus.
Is the example explanation with Fig. 2, when the distance between Wireless Access Unit and the user (for example d1 and d2) when differing bigger, though increase the degree of freedom that a Wireless Access Unit can increase the space dimension, the validity of transmitting power can reduce greatly.The performance that causes if tie up in the space that increases increases the irreparable words of introducing with this Wireless Access Unit of path loss, and increase Wireless Access Unit 2 transmits to the user and not necessarily can increase the performance of system.In such distributing antenna system, the problem of existence is how to select Wireless Access Unit to send signal to the user could make that systematic function is best.
List of references [3], " Tao Xiaofeng, Ni Li; Dai Zuojun, Liu Bao ling, Zhang Ping; " Intelligent group handover mode in multicell infrastructure "; PIMRC 2003, Vol.1, Sept.7-10; 2003 ", in mentioned the notion that a group is switched, its basic thought is to set a threshold value, and is for path loss all selected less than the Wireless Access Unit of this threshold value.
List of references [4], " Wan Choi; Jeffrey G.Andrews; and Chaehag Yi, " Thecapacity of multicellular distributed antenna networks, " WirelessCom2005; Jun12-16; 2005 ", in mentioned another kind of method, its L Wireless Access Unit that at every turn all selects fixed number is that a user sends data.Like this, L has the Wireless Access Unit of minimal path loss will be selected.
Absolute figure that two kinds of methods above-mentioned all are based on path loss in fact carries out choosing of Wireless Access Unit, and they all can not guarantee the maximization of system channel capacity.And to realize the maximization of power system capacity, the selection of Wireless Access Unit should and they with the relative value of the path loss between the user relation is arranged.That is, when the user when Wireless Access Unit is very near, select this nearest Wireless Access Unit can realize the maximization of capacity fully, there is no need again power division to the enterprising line data transmission of other Wireless Access Units.
Summary of the invention
For overcoming above problem, the present invention proposes a kind of distributing antenna system and communication means thereof, and it can obtain the maximization of power system capacity when selecting Wireless Access Unit for the user.
Distributing antenna system of the present invention is based on cell structure, and each sub-district comprises CPU, a plurality of Wireless Access Unit and transmission link, and the transmission link that these a plurality of Wireless Access Units pass through separately respectively is connected with CPU.Wherein, each Wireless Access Unit includes duplexer, and this duplexer is used for receiving user's uplink information and sending downlink information from CPU by the antenna on it.This CPU comprises: path loss estimator, be used for and estimate from the uplink information of above-mentioned a plurality of Wireless Access Units, obtain the path loss between each Wireless Access Unit and this user, and the numbering of storing each path loss and Wireless Access Unit accordingly; Resource allocator according to the path loss of above-mentioned storage and the numbering of Wireless Access Unit, obtains resource allocation information, and this resource allocation information comprises the Wireless Access Unit that this user adopts; Send processor,, this user data of users is carried out corresponding transmitted signals handle, generate baseband signal streams at each Wireless Access Unit in the Wireless Access Unit that this user adopted according to above-mentioned resource allocation information; The Wireless Access Unit selector according to above-mentioned resource allocation information, is selected corresponding Wireless Access Unit in all Wireless Access Units that are connected with CPU, send above-mentioned each baseband signal streams after sending processor processing; And the radio frequency link group is carried out upconversion process respectively with the baseband signal streams of Wireless Access Unit selector output, and the baseband signal streams after the upconversion process is sent to corresponding Wireless Access Unit as downlink information respectively by transmission link.
Communication means of the present invention comprises step:
Step 1 receives same user's uplink information respectively by above-mentioned Wireless Access Unit, and uplink information is sent to CPU;
Step 2, CPU are carried out path loss respectively to the uplink information from this user of each Wireless Access Unit and are estimated, and the numbering of store path loss accordingly and Wireless Access Unit;
Step 3 according to the path loss of above-mentioned storage and the numbering of Wireless Access Unit, obtains resource allocation information, and this resource allocation information comprises the Wireless Access Unit that this user adopts;
Step 4 according to above-mentioned resource allocation information, is carried out corresponding transmitted signals with this user data of users and is handled, and generates the baseband signal streams at each Wireless Access Unit in the Wireless Access Unit that this user adopted;
Step 5 according to above-mentioned resource allocation information, selects to be used to send the corresponding Wireless Access Unit of each baseband signal streams, sends each baseband signal streams respectively; And
Step 6 is carried out upconversion process respectively to each baseband signal streams, and the baseband signal streams after the upconversion process is sent to corresponding Wireless Access Unit respectively as downlink information; And
Step 7 sends to above-mentioned same user by each Wireless Access Unit with downlink information.
Resource allocation process in above-mentioned steps three may further comprise the steps:
I) from above-mentioned path loss, find out the minimum value of path loss;
Ii) according to this minimum value, find out corresponding Wireless Access Unit, with it as the Wireless Access Unit that is used to launch this user data of users;
Iii) from other remaining path losses, find out the minimum value of path loss;
Iv) according to this minimum value, find out corresponding Wireless Access Unit, and whether the adding of calculating this Wireless Access Unit increases power system capacity, when the adding of this Wireless Access Unit makes that power system capacity reduces, then resource allocation finishes, when the adding of this Wireless Access Unit makes that power system capacity increases, then with it as the Wireless Access Unit that is used to launch user data, repeating step iii, iv finish until resource allocation then.
Compared with prior art, distributing antenna system of the present invention and communication means can be distributed to same user with the Wireless Access Unit that can realize the power system capacity maximum, can increase power system capacity in the degree of freedom that increases the space dimension for this user.
Description of drawings
Fig. 1 is a kind of schematic diagram of active distributed formula antenna system.
Fig. 2 is the schematic diagram that has the distributing antenna system of path loss difference.
Fig. 3 is the schematic diagram of distributing antenna system of the present invention.
Fig. 4 is the concrete block diagram of distributing antenna system of the present invention.
Fig. 5 is the flow chart of the resource allocation process of the communication means of distributing antenna system of the present invention.
Embodiment
Below with reference to accompanying drawing distributing antenna system of the present invention is described in detail.
Fig. 3 is the schematic diagram of distributing antenna system of the present invention.Shown a plurality of sub-districts (representing with dashed circle) among Fig. 3, each sub-district comprises at least one CPU and a plurality of Wireless Access Unit.For convenience of description, be provided with a CPU CU and a plurality of Wireless Access Unit in each sub-district among Fig. 3 equably, but in the system of reality, the quantity and the distribution situation of Wireless Access Unit can be set according to the situation of sub-district.
In each sub-district, Wireless Access Unit wherein is connected with CPU, on the one hand, each Wireless Access Unit receives from the uplink information of user in the sub-district and will be sent to CPU after this uplink information processing, on the other hand, each Wireless Access Unit receives the downlink information from CPU, and with after this downlink information processing, sends to using in the sub-district by the transmitting antenna on it and produce.
Fig. 4 is the concrete structure figure of distributing antenna system of the present invention, wherein only shown CPU and Wireless Access Unit in the sub-district.For the generality of describing, therefore, the quantity of supposing the Wireless Access Unit in this sub-district here is nT.Simultaneously, for convenience of description, be that example describes only here, in same sub-district, adopting the example of a plurality of CPU to obtain by its derivation with a CPU.
For each Wireless Access Unit, it comprises duplexer 11, is positioned at antenna 12, received power amplifier 13, electrical to optical converter 14, emission power amplifier 15 and optical-electrical converter 16 on the duplexer 11.Here, received power amplifier 13 and emission power amplifier 15 belong to selectable unit.Big and signal to noise ratio under the situation, also can be omitted preferably at the power of distributing antenna system.
Simultaneously, for CPU CU, it comprises optical-electrical converter 21, path loss estimator 22, resource allocator 23, sends processor 24, Wireless Access Unit selector 25, radio frequency link group 26 and electrical to optical converter 27.
Before setting up the communicating by letter an of user and this distributing antenna system, this user can be according to the descending channel information of its reception, the sub-district that decision should insert.For example, for gsm system, the user decides the sub-district of being inserted according to the energy on the frequency of each cell channel, and for the WCDMA system, the user decides the sub-district of being inserted according to the energy on the scrambler of each sub-district.
After determining the sub-district of inserting, this user will send communication request to this sub-district.
In distributing antenna system of the present invention, on up direction, for each Wireless Access Unit, uplink information (the radiofrequency signal that duplexer 11 utilizes the antenna 12 on it to receive from this user, it can be above-mentioned communication request, also can be other information), and carry out power amplification by the radiofrequency signal of 13 pairs of receptions of received power amplifier, this received power amplifier can be low noise amplifier.Radiofrequency signal after electrical to optical converter 14 will amplify is carried out the electric light conversion and is obtained corresponding light signal, and sends to CPU CU by the optical fiber link between this Wireless Access Unit and the CPU CU.
For CPU, the light signal of optical-electrical converter 21 all nT Wireless Access Unit in optical fiber link receives from this sub-district, and will be converted to corresponding radiofrequency signal from the light signal of each Wireless Access Unit respectively.Path loss estimator 22 estimates the path loss between each Wireless Access Unit in this user and the sub-district according to radiofrequency signal, and the path loss of storage acquisition and corresponding Wireless Access Unit thereof.For example, this path loss and corresponding Wireless Access Unit can be stored according to ascending order, for example in the mode shown in the table 1, are assumed to be { Pl
1, Pl
2, Pl
3... Pl
NT, Pl wherein
1Represent minimum path loss values.Table 1 is a kind of storage mode, and the present invention also not only is confined to this, also can just need set up the corresponding relation between path loss and its corresponding Wireless Access Unit according to descending order or unordered storage.
Table 1
| RAU 1 | RAU 2 | RAU 3 | ... | RAU nT |
| Pl 1 | Pl 2 | Pl 3 | ... | Pl nT |
Resource allocator 23 carries out resource allocation according to path loss and the corresponding Wireless Access Unit thereof that path estimator 22 estimates.As shown in Figure 5, the resource allocation process of resource allocator is as follows:
Step 1 is found out the minimum value of path loss from the path loss that path estimator 22 estimates;
Step 2 according to this minimum value, is found out corresponding Wireless Access Unit, with it as the Wireless Access Unit that is used to launch this user data of users;
Step 3 is found out the minimum value of path loss from other remaining path losses;
Step 4 according to this minimum value, is found out corresponding Wireless Access Unit, and whether the adding of calculating this Wireless Access Unit increases power system capacity.When the adding of this Wireless Access Unit made that power system capacity reduces, then resource allocation finished.When the adding of this Wireless Access Unit makes that power system capacity increases, then with it as the Wireless Access Unit that is used to launch user data, repeating step three, four then, finish until resource allocation.
In the above-mentioned resource allocation process of resource allocator 23, can through type (1) realize the selection of the Wireless Access Unit of maximum system capacity.
Wherein, Ce represents the desired value of channel capacity, and E represents to ask the computing of expectation, I
NRBe the unit matrix of nR*nR dimension, nR represents this user's antenna amount, H and H
*Be respectively channel matrix and its transposed matrix, Q
LBe to send the correlation matrix of signal, and L represent from nT Wireless Access Unit, to select the power system capacity maximum time the quantity of Wireless Access Unit.
Above-mentioned H and Q
LRespectively suc as formula shown in (2), (3):
H
wBe the stochastic equation of nT*nR dimension, its each element is the Gaussian random variable of zero-mean, unit variance.Wherein,
Channel gain between expression user and nT the Wireless Access Unit.
Through behind the above-mentioned resource allocation process, suppose that resource allocator 23 selected L Wireless Access Unit at this moment, these Wireless Access Units are used to send this user data of users, and can satisfy the power system capacity maximum.Simultaneously, can draw, this user data of users should be divided into the L road and transmit.That is, the resource allocation information of above-mentioned resource allocation process generation comprises: the Wireless Access Unit that this user adopted.
On down direction, send processor 24 and this user data of users is sent signal processing according to resource allocation information, generate L roadbed band signal, the processing here comprises spacing wave processing, coding, modulation etc., and this communication request that can send by the user in communication process is determined.
L the Wireless Access Unit that Wireless Access Unit selector 25 selects to be used to send this user data according to resource allocation information sends L road user data.L represents to choose the quantity of Wireless Access Unit among the figure, and nT represents always total nT Wireless Access Unit, does not send this user data of users on the unchecked Wireless Access Unit.
Send radio frequency link group 26 and will carry out upconversion process, the radiofrequency signal of acquisition correspondence from the nT roadbed band signal of Wireless Access Unit selector 25 outputs (wherein only have on the baseband signal of L the Wireless Access Unit correspondence of choosing and just send this user data of users).
Electrical to optical converter 27 will send the nT road radiofrequency signal that radio frequency link group 26 outputs to and carry out the electric light conversion, thereby obtain corresponding nT road light signal, and send it to corresponding Wireless Access Unit by optical fiber link.
Optical-electrical converter 16 receives light signal from CPU CU by optical fiber link, and this light signal is converted to corresponding radiofrequency signal.This radiofrequency signal via duplexer 11, sends to the user from antenna 12 after emission power amplifier 15 amplifies.
From as can be seen above, distribute to this user by can realize the Wireless Access Unit of power system capacity maximum in CPU, can in the degree of freedom that increases the space dimension for this user, increase power system capacity.
Below just realize a preferred embodiment of the present invention, what it was primarily aimed at is Wireless Access Unit and CPU distance situation far away, therefore adopts optical fiber link to transmit signal between Wireless Access Unit and CPU.For this reason, it is on the Wireless Access Unit and needing corresponding optical-electrical converter and electrical to optical converter to realize mutual conversion between the light signal and the signal of telecommunication (radiofrequency signal) on the CPU.
Yet, situation for Wireless Access Unit and CPU close together, can adopt cable link to replace optical fiber link, thereby, can omit electrical signal conversion is the process that light signal and light signal are converted to the signal of telecommunication, and then this distributing antenna system can not need to adopt electrical to optical converter and optical-electrical converter.
Further, because the distance between Wireless Access Unit and the CPU can be set according to actual conditions, therefore, can adopt cable link to transmit signal for the situation of close together, and, can adopt optical fiber link to transmit signal for distance situation far away.
It should be noted that, though only expressed an antenna among Fig. 4 on each Wireless Access Unit, but for the distributing antenna system of reality, it can be many antennas, and under the situation that satisfies the power system capacity maximum, CPU can be distributed to same user with these antenna while (all or part of), equally, this user also has many antennas.At this moment, the radio frequency link group will belong to by the different antennae transmitting users The data multiplexer on the same Wireless Access Unit carry out multiplexing after, be sent to Wireless Access Unit by optical fiber link or cable link.Simultaneously, this Wireless Access Unit also needs unit in many picture groups 4 and multiplexer (up direction) and demodulation multiplexer (down direction) to realize the transmission and the reception of multiple signals.Just, each Wireless Access Unit is equivalent to a plurality of Wireless Access Units, and it adopts a shared transmission link behind multiplexer and the demodulation multiplexer.
Claims (7)
1. distributing antenna system, it is based on cell structure, and each sub-district comprises CPU, a plurality of Wireless Access Unit and transmission link, and these a plurality of Wireless Access Units transmission link by separately respectively are connected with CPU, wherein,
Each Wireless Access Unit includes duplexer, and the duplexer of above-mentioned a plurality of Wireless Access Units receives same user's uplink information and sends downlink information from CPU to this user by the antenna on it,
This CPU comprises:
Path loss estimator is used for the uplink information from above-mentioned a plurality of Wireless Access Units is estimated, obtains the path loss between each Wireless Access Unit and this user, and the numbering of storing each path loss and Wireless Access Unit accordingly;
Resource allocator according to the path loss of above-mentioned storage and the numbering of Wireless Access Unit, obtains resource allocation information, and this resource allocation information comprises the Wireless Access Unit that this user adopts;
Send processor,, this user data of users is carried out corresponding transmitted signals handle, generate baseband signal streams at each Wireless Access Unit in the Wireless Access Unit that this user adopted according to above-mentioned resource allocation information;
The Wireless Access Unit selector according to above-mentioned resource allocation information, is selected corresponding Wireless Access Unit in all Wireless Access Units that are connected with CPU, send above-mentioned each baseband signal streams after sending processor processing; And
The radio frequency link group is carried out upconversion process respectively with the baseband signal streams of Wireless Access Unit selector output, and the baseband signal streams after the upconversion process is sent to corresponding Wireless Access Unit as downlink information respectively by transmission link.
2. distributing antenna system as claimed in claim 1 is characterized in that Wireless Access Unit further comprises:
Emission power amplifier is used for the downlink information from CPU is carried out power amplification, and the downlink information after the power amplification is sent to duplexer; And
The received power amplifier is used for the uplink information that duplexer receives is carried out power amplification, and the uplink information after the power amplification is sent to CPU by transmission link.
3. distributing antenna system as claimed in claim 1 is characterized in that,
Wireless Access Unit further comprises:
Electrical to optical converter (14) is used for the uplink information that duplexer receives is converted to corresponding light signal, and this light signal is sent to CPU by transmission link; And
Optical-electrical converter (16) is used for the downlink information from CPU is converted to the corresponding signal of telecommunication, and with this signal of telecommunication by the antenna transmission on the duplexer, and,
CPU further comprises:
Optical-electrical converter (21) is used for and will changes the corresponding signal of telecommunication from the light signal of each transmission link, and sends it to path loss estimator respectively; And
Electrical to optical converter (27) is used for each the road downlink information from the radio frequency link group is converted to corresponding light signal, and sends to corresponding Wireless Access Unit by the transmission link of correspondence.
4. distributing antenna system as claimed in claim 2 is characterized in that,
Wireless Access Unit further comprises:
Electrical to optical converter (14), the uplink information that is used for carrying out power amplification through the received power amplifier is converted to corresponding light signal, and this light signal is sent to CPU by transmission link; And
Optical-electrical converter (16) is used for the downlink information from CPU is converted to the corresponding signal of telecommunication, and this signal of telecommunication is sent to emission power amplifier, and,
CPU further comprises:
Optical-electrical converter (21) is used for and will changes the corresponding signal of telecommunication from the light signal of each transmission link, and sends it to path loss estimator respectively; And
Electrical to optical converter (27) is used for each the road downlink information from the radio frequency link group is converted to corresponding light signal, and sends to corresponding Wireless Access Unit by the transmission link of correspondence.
5. as claim 2 or 4 described distributing antenna systems, it is characterized in that this received power amplifier is a low noise amplifier.
6. the communication means of a distributing antenna system, wherein this distributing antenna system has CPU, a plurality of Wireless Access Unit and transmission link, and the method comprising the steps of:
Step 1 receives same user's uplink information respectively by above-mentioned Wireless Access Unit, and uplink information is sent to CPU;
Step 2, CPU are carried out path loss respectively to the uplink information from this user of each Wireless Access Unit and are estimated, and the numbering of store path loss accordingly and Wireless Access Unit;
Step 3 according to the path loss of above-mentioned storage and the numbering of Wireless Access Unit, obtains resource allocation information, and this resource allocation information comprises the Wireless Access Unit that this user adopts;
Step 4 according to above-mentioned resource allocation information, is carried out corresponding transmitted signals with this user data of users and is handled, and generates the baseband signal streams at each Wireless Access Unit in the Wireless Access Unit that this user adopted;
Step 5 according to above-mentioned resource allocation information, selects to be used to send the corresponding Wireless Access Unit of each baseband signal streams, sends each baseband signal streams respectively; And
Step 6 is carried out upconversion process respectively to each baseband signal streams, and the baseband signal streams after the upconversion process is sent to corresponding Wireless Access Unit respectively as downlink information; And
Step 7 sends to above-mentioned same user by each Wireless Access Unit with downlink information.
7. communication means as claimed in claim 6 is characterized in that, the resource allocation process in the above-mentioned steps three may further comprise the steps:
I) from above-mentioned path loss, find out the minimum value of path loss;
Ii) according to this minimum value, find out corresponding Wireless Access Unit, with it as the Wireless Access Unit that is used to launch this user data of users;
Iii) from other remaining path losses, find out the minimum value of path loss;
Iv) according to this minimum value, find out corresponding Wireless Access Unit, and whether the adding of calculating this Wireless Access Unit increases power system capacity, when the adding of this Wireless Access Unit makes that power system capacity reduces, then resource allocation finishes, when the adding of this Wireless Access Unit makes that power system capacity increases, then with it as the Wireless Access Unit that is used to launch user data, repeating step iii, iv finish until resource allocation then.
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| WO2005018181A1 (en) * | 2003-08-06 | 2005-02-24 | Qualcomm Incorporated | Cooperative autonomous and scheduled resource allocation for a distributed communication system |
| WO2005039214A1 (en) * | 2003-10-20 | 2005-04-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio resource-sharing cells |
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| JP3645140B2 (en) * | 1999-12-28 | 2005-05-11 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2005018181A1 (en) * | 2003-08-06 | 2005-02-24 | Qualcomm Incorporated | Cooperative autonomous and scheduled resource allocation for a distributed communication system |
| WO2005039214A1 (en) * | 2003-10-20 | 2005-04-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio resource-sharing cells |
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| CN1917388A (en) | 2007-02-21 |
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