CN101860886B

CN101860886B - Wireless communication system, interference control method and base station thereof

Info

Publication number: CN101860886B
Application number: CN2010101626298A
Authority: CN
Inventors: 河崎义博
Original assignee: Fujitsu Ltd
Current assignee: Fujitsu Ltd
Priority date: 2005-02-18
Filing date: 2005-02-18
Publication date: 2013-05-08
Anticipated expiration: 2025-02-18
Also published as: CN101860886A

Abstract

The invention provides a wireless communication system, an interference control method and a base station. The wireless communication system is provided with a mobile terminal and a plurality of base stations, wherein the base stations communicate with the mobile terminal in the subordinate element; the base station are respectively provided with an interference power measurement part, an interference reduction request part and a control part, wherein the interference power measurement part measures the interference power received from the mobile terminals in neighboring elements, the interference reduction request part requests the base stations in the neighboring elements to reduce interference based on the interference power, and the control part is requested by the base stations in the neighboring elements to reduce interference and informs the mobile terminal in the subordinate element of information on controlling power sending to reduce interference; and the mobile terminal is provided with a receiving part, wherein the receiving part receives the information on controlling power sending informed by the base station requested to reduce interference.

Description

Wireless communication system, interference control method and base station

Patent application of the present invention is that denomination of invention is that " interference reducing method in base station and this base station ", the applying date to be on February 18th, 2005, international application no be " PCT/JP2005/002556 ", national applications number dividing an application for the application for a patent for invention of " 200580047800.8 ".

Technical field

The present invention relates to wireless communication system, interference control method and base station, particularly with wireless communication system, interference control method and the base station of control that is present in mobile terminal in the subordinate unit and communicates and reduce the interference of the mobile terminal within being present in adjacent cells.

Background technology

CDMA(Code Division Multiple Access: code division multiple access) communication system is just at Fast Practical, and the commercial service that not only receive and dispatch sound and still image, can also receive and dispatch the wideband CDMA system (W-CDMA:Wideband-CDMA) of the large data such as dynamic image also begins.The specification of wideband CDMA system is that the standardisation bodies by 3-G (Generation Three mobile communication system) is 3GPP(3 ^rdGeneration Partnership Project: the 3rd third-generation mobile communication partner program) formulate, for developing the system that can realize than more high-quality service now, continuing to append the research all size.

Figure 14 is the network structure of the W-CDMA system of existing 3GPP specification.System is made of 4 category nodes of core network (CN:Core Network) 100, radio network control apparatus (RNC:Radio Network Controler) 101#0～101#n, wireless base station (NodeB) 102#0～102#2 and mobile terminal (UE:User Equipment) 103.Each node 100,101#0～101#n, 102#0～102#n utilize ATM(Asynchronous Transfer Mode: asynchronous transfer mode) transfer path etc. has carried out connecting (wired interval) with physics mode.Wireless base station 102#0～102#n has carried out being connected (between radio zone) with mobile terminal 103 by wireless signal.Iu is the interface between radio network control apparatus 101#0～101#n and core network 100, Iur is the interface between radio network control apparatus 101#0～101#n, Iub is the interface between radio network control apparatus 101#0～101#n and wireless base station 102#0～102#n, and Uu is the interface between wireless base station 102#0～102#n and mobile terminal 103.

User data sends to RNC 101#0～RNC 101#1 from the CN 100 that contains switch or server, database via the Iu circuit.Recipient's mobile terminal UE 103 is in the situation that enclose in RNC 101#0 subordinate's unit 104#1, user data sends to the NodeB 102#1 that contains this unit via the Iub circuit from RNC 101#0, via the Uu interface, send to this mobile terminal UE 103.

In the moving body cdma communication system by a plurality of cell formations as described above, mobile terminal sends to the signal (up link (up link) signal or reverse link (Reverse link) signal) of the base station in connection also can arrive the base station of adjacent cells, in the situation that use same frequency band between the unit on up link, its result becomes the interference signal to adjacent cells.Especially mobile terminal is present in the situation of borderline region of a plurality of cells overlaps, increases from the transmitted signal of this mobile terminal interference signal level to adjacent cells.Figure 15 illustrates in 2 unit, the mobile terminal in unit brings the situation of interference to the base station of adjacent cells.In addition, for convenience of explanation, base station (unit) quantity is 2, and mobile terminal quantity is 3.

Mobile terminal MS 1 in unit CL1 communicates with base station BTS 1, also can arrive the base station BTS 2 of adjacent cells CL2 from the transmitted signal of this mobile terminal MS 1, becomes interference signal.And mobile terminal MS 2, MS3 in unit CL2 communicate with base station BTS 2, also can arrive the base station BTS 1 of adjacent cells CL1 from the transmitted signal of this mobile terminal MS 2, MS3, become interference signal.In this situation, the interference of mobile terminal MS 2 that the interference ratio that is present in the mobile terminal MS 3 of the overlapping borderline region of unit CL1, CL2 is not present in borderline region is large.

Figure 16 illustrates the base station BTS 1 of unit CL1, CL2 shown in Figure 15, the situation of the reception signal component in BTS2.As shown in figure 16, the received signal power of base station BTS 1 is from the received signal power of the mobile terminal MS 1 in subordinate's unit CL1 with from the summation of the received signal power of the interior mobile terminal MS 2 of adjacent cells (unit CL2), MS3.In addition, say exactly, also comprise thermal noise, but omit at this.And the received signal power of base station BTS 2 is from the received signal power of the mobile terminal MS 2 in subordinate's unit CL2, MS3 with from the summation of the received signal power of the interior mobile terminal MS 1 of adjacent cells (unit CL1).

Maximum in the base station allows that received signal power is considered to the Radio Resource in up link, and this Radio Resource is limited by above-mentioned interference signal from adjacent cells.On the other hand, the mobile terminal in the unit that is subject to arranging from the base station of the interference of adjacent cells brings interference to adjacent cells, brings restriction for the Radio Resource of adjacent cells.

In current 3GPP W-CDMA system, be positioned at the upper radio network control apparatus RNC of base station BTS based on total received signal power of base station carry out Call Admission Control (admit control, congestion control: admission control, but do not reduce control from the interfering signal power of above-mentioned adjacent cells Congestion control).That is, though the received signal power from the mobile terminal in the subordinate unit can be controlled in the base station, can not control the interfering signal power from adjacent cells.

In the past, the existing technology (for example, with reference to patent documentation 1) of controlling from the interference of adjacent base station.The purpose of the prior art is, uses in up link and down link in the communication system of same frequency band, alleviates the interference that the down link signal from other base station brings to mobile terminal.That is, mobile terminal monitors intensity, the frequency of the interference signal that the down link signal that sends from other base station causes, when interference level during greater than threshold value, the base station notice exists and disturbs in the communication, and further notice is disturbed and produced time information.The base station that receives notice changes the subband (sub band) (subchannel) that uses when this mobile terminal sends data, thereby eliminates the interference that this mobile terminal is subject to.But, in the time of can not solving in this base station if leave unused frequency band, to the epigyny device notice interfere information (disturb and produce, disturb generation constantly) of this base station.Epigyny device is investigated the adjacent base station of this base station, according to the interference generation constantly, determines to become and disturbs the base station that produces reason, the subband that uses when changing to these cause of failures base station transmission data.Receive from epigyny device the subband that uses the base station change down link data transmission of indication.If not idle subband interrupts sending.

But the prior art can not reduce mobile terminal in the unit adjacent with the unit of paying close attention to, especially be present in the interference that the mobile terminal near unit side adjacent cells brings to the base station of this concern unit by uplink signal.

According to the above, the object of the invention is to, reduce the interference power from adjacent cells.

Another object of the present invention is to, the total interference power that is subject to when the mobile terminal from adjacent cells is asked this adjacent base station reduce disturbance, with reduce disturbance power during greater than set point.

Another purpose of the present invention is, judges the mobile terminal that is present in elementary boundary and might produces the larger interference signal, reduces the interference signal from this mobile terminal, thus reduce disturbance power.

Another object of the present invention is to, the interference signal of bringing to the base station of adjacent cells by the mobile terminal that communicates with each base station reduces control, can improve the throughput (throughput) of entire system.

Patent documentation 1: TOHKEMY 2003-259414 communique

Summary of the invention

By with the wireless communication system, interference control method and the base station that are present in mobile terminal in the subordinate unit and communicate and reduce the control of the interference that produces from the mobile terminal that is in adjacent cells, can solve above-mentioned problem.

a first aspect of the present invention provides a kind of wireless communication system, it has mobile terminal and a plurality of base station, and the mobile terminal in described a plurality of base stations and subordinate unit communicates, and it is characterized in that, described a plurality of base station has respectively: receive radio section, it receives wireless signal, total received signal power determination part, it measures total received signal power P according to the output signal that receives radio section, demodulation section, it carries out demodulation to the output signal that receives radio section, the desired signal power calculating part, it is according to the signal that obtains by demodulation, calculates total received power from the whole mobile terminals in communication as desired signal power Pa, the interference power calculating part, it adopts formula Pother=P-Pa, calculates total interference power Pother that the mobile terminal in whole adjacent units receives as always in abutting connection with received signal power, comparing section, it exports comparative result to always comparing in abutting connection with received signal power and threshold power Pth, the sign generating unit, it is with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, generate the request adjoining base station and reduce the marking signal Fint that disturbs, be input to the adjoining base station communication interface part, the sending part of described adjoining base station communication interface part, it sends to whole adjoining base stations after this marking signal Fint is added transmitting base station ID, the acceptance division of described adjoining base station communication interface part, it is from adjoining base station receiving flag signal Fint, and the transmitting base station title of this marking signal is notified near terminal determination portion unit side via uplink scheduling section, near terminal determination portion unit side, it is result of determination near described demodulation section is inputted the unit side sent of mobile terminal each communication, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, be each communication in mobile terminal whether interference is brought in the base station of sending marking signal Fint, the mobile terminal that brings this interference is notified to uplink scheduling section, uplink scheduling section, it is according to the described notice near terminal determination portion described unit side, and the upstream data that the restriction of indication control signal generating unit becomes the mobile terminal of cause of failures sends, and control signal generating unit, it is by this indication, generate control signal to the mobile terminal that the base station of sending described marking signal is brought interference, make the transmission rate of temporary transient reduction upstream data or temporarily stop the transmission of upstream data, described mobile terminal is measured the received power P2 of the common pilot signal that the base station from communication and adjoining base station respectively receive, P1, calculate this received power P2, the absolute value delta P of the difference of P1, if absolute value delta P is less than threshold value, be judged to be adjoining base station is brought interference, if absolute value delta P is more than threshold value, be not judged to be adjoining base station is brought interference, after the base station title of additional adjoining base station, result of determination is notified to the base station in communication as near result of determination described unit side, when adopting described control signal restriction upstream data to send, the temporary transient transmission that reduces the transmission rate of upstream data or temporarily stop upstream data.

a second aspect of the present invention provides a kind of wireless communication system, it has mobile terminal and a plurality of base station, and the mobile terminal in described a plurality of base stations and subordinate unit communicates, and it is characterized in that, described a plurality of base station has respectively: receive radio section, it receives wireless signal, demodulation section, it carries out demodulation to the output signal that receives radio section, in abutting connection with the received signal power calculating part, it is according to the signal that obtains by demodulation, according to each unit of whole adjacent units, measure from the mobile terminal in this unit in abutting connection with received signal power Pcell n, wherein, n=1～N, N are the adjacent unit numbers, always in abutting connection with the received signal power calculating part, it adds up in abutting connection with received signal power Pcell n this, calculates always in abutting connection with received signal power Pother, comparing section, it exports comparative result to always comparing in abutting connection with received signal power and threshold power Pth, send the destination base station determination section, it is with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, sort according to size order in abutting connection with received signal power Pcell 1～Pcell N described, determine the as a token of transmission destination base station of signal of the base station corresponding with upper m unit after sequence, perhaps decision and the transmission destination base station of signal as a token of in abutting connection with the base station of unit corresponding to received signal power more than described threshold value Pth2 in received signal power Pcell 1～Pcell N, the sign generating unit, it is with reference to described comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, the request that generates reduces the marking signal Fint that disturbs, and is input to the adjoining base station communication interface part to the additional transmitting base station title of this marking signal with after sending the destination base station title, the sending part of described adjoining base station communication interface part, it sends to the transmission destination base station with this marking signal Fint, the acceptance division of described adjoining base station communication interface part, it is from adjoining base station receiving flag signal Fint, and the transmitting base station title of this marking signal is notified near terminal determination portion unit side via uplink scheduling section, near terminal determination portion unit side, it is result of determination near described demodulation section is inputted the unit side sent of mobile terminal each communication, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, be each communication in mobile terminal whether interference is brought in the base station of sending marking signal Fint, the mobile terminal that brings this interference is notified to uplink scheduling section, uplink scheduling section, it is according to the described notice near terminal determination portion described unit side, and the upstream data that the restriction of indication control signal generating unit becomes the mobile terminal of cause of failures sends, and control signal generating unit, it is by this indication, generate control signal to the mobile terminal that the base station of sending described marking signal is brought interference, make the transmission rate of temporary transient reduction upstream data or temporarily stop the transmission of upstream data, described mobile terminal is measured the received power P2 of the common pilot signal that the base station from communication and adjoining base station respectively receive, P1, calculate this received power P2, the absolute value delta P of the difference of P1, if absolute value delta P is less than threshold value, be judged to be adjoining base station is brought interference, if absolute value delta P is more than threshold value, be not judged to be adjoining base station is brought interference, after the base station title of additional adjoining base station, result of determination is notified to the base station in communication as near result of determination described unit side, when adopting described control signal restriction upstream data to send, the temporary transient transmission that reduces the transmission rate of upstream data or temporarily stop upstream data.

a third aspect of the present invention provides the interference reduction method in a kind of wireless communication system, this wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that, carry out following steps in each of described a plurality of base stations: measure total received signal power P according to the output signal of the reception radio section that receives wireless signal, the output signal that receives radio section is carried out demodulation, the desired signal power calculation procedure according to the signal that obtains by demodulation, is calculated total received power from the whole mobile terminals in communication as desired signal power Pa, the interference power calculation procedure adopts formula Pother=P-Pa, calculates total interference power Pother that the mobile terminal in whole adjacent units receives as always in abutting connection with received signal power, to always comparing in abutting connection with received signal power and threshold power Pth, export comparative result, sign generates step, with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, generate the request adjoining base station and reduce the marking signal Fint that disturbs, to sending to whole adjoining base stations after the additional transmitting base station ID of this marking signal Fint, from adjoining base station receiving flag signal Fint, identify the transmitting base station title of this marking signal, near the result of determination unit side that mobile terminal in each communication that input obtains by described demodulation is sent, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, and namely whether the mobile terminal in each communication brings interference to the base station of sending marking signal Fint, in the situation that interference is brought in the base station of sending marking signal Fint, the upstream data that the indication restriction becomes the mobile terminal of cause of failures sends, and by this indication, generate control signal and send to the mobile terminal that the base station of sending described marking signal is brought interference, make the transmission rate of temporary transient reduction upstream data or temporarily stop the transmission of upstream data, carry out following steps in described mobile terminal: the received power P2 that measures the common pilot signal that the base station from communication and adjoining base station respectively receive, P1, calculate this received power P2, the absolute value delta P of the difference of P1, if absolute value delta P is less than threshold value, be judged to be adjoining base station is brought interference, if absolute value delta P is more than threshold value, be not judged to be adjoining base station is brought interference, after the base station title of additional adjoining base station, result of determination is notified to the base station in communication as near result of determination described unit side, and when adopting described control signal restriction upstream data to send, temporarily reduce the transmission rate of upstream data or temporarily stop the transmission of upstream data.

a fourth aspect of the present invention provides the interference reduction method in a kind of wireless communication system, this wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that, carry out following steps in each of described a plurality of base stations: the output signal to the reception radio section that receives wireless signal is carried out demodulation, according to the signal that obtains by demodulation, according to each unit of whole adjacent units, measure from the mobile terminal in this unit in abutting connection with received signal power Pcell n, wherein, n=1～N, N are the adjacent unit numbers, this is added up in abutting connection with received signal power Pcelln, calculate always in abutting connection with received signal power Pother, to always comparing in abutting connection with received signal power and threshold power Pth, export comparative result, send the destination base station deciding step, with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, sort according to size order in abutting connection with received signal power Pcell 1～Pcell N described, determine the as a token of transmission destination base station of signal of the base station corresponding with upper m unit after sequence, perhaps decision and the transmission destination base station of signal as a token of in abutting connection with the base station of unit corresponding to received signal power more than described threshold value Pth2 in received signal power Pcell 1～Pcell N, with reference to described comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, the request that generates reduces the marking signal Fint that disturbs, and sends to the transmission destination base station to the additional transmitting base station title of this marking signal with after sending the destination base station title, from adjoining base station receiving flag signal Fint, identify the transmitting base station title of this marking signal, near the result of determination unit side that mobile terminal in each communication that input obtains by described demodulation is sent, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, and namely whether the mobile terminal in each communication brings interference to the base station of sending marking signal Fint, in the situation that interference is brought in the base station of sending marking signal Fint, the upstream data that the indication restriction becomes the mobile terminal of cause of failures sends, and by this indication, generate control signal and send to the mobile terminal that the base station of sending described marking signal is brought interference, make the transmission rate of temporary transient reduction upstream data or temporarily stop the transmission of upstream data, carry out following steps in described mobile terminal: the received power P2 that measures the common pilot signal that the base station from communication and adjoining base station respectively receive, P1, calculate this received power P2, the absolute value delta P of the difference of P1, if absolute value delta P is less than threshold value, be judged to be adjoining base station is brought interference, if absolute value delta P is more than threshold value, be not judged to be adjoining base station is brought interference, after the base station title of additional adjoining base station, result of determination is notified to the base station in communication as near result of determination described unit side, and when adopting described control signal restriction upstream data to send, temporarily reduce the transmission rate of upstream data or temporarily stop the transmission of upstream data.

A fifth aspect of the present invention provides the base station of using in a kind of wireless communication system, described wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that, described base station has: receive radio section, it receives wireless signal; Total received signal power determination part, it measures total received signal power P according to the output signal that receives radio section; Demodulation section, it carries out demodulation to the output signal that receives radio section; The desired signal power calculating part, it is according to the signal that obtains by demodulation, calculates total received power from the whole mobile terminals in communication as desired signal power Pa; The interference power calculating part, it adopts formula Pother=P-Pa, calculates total interference power Pother that the mobile terminal in whole adjacent units receives as always in abutting connection with received signal power; Comparing section, it exports comparative result to always comparing in abutting connection with received signal power and threshold power Pth; The sign generating unit, it is with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, generate the request adjoining base station and reduce the marking signal Fint that disturbs, be input to the adjoining base station communication interface part; The sending part of described adjoining base station communication interface part, it sends to whole adjoining base stations after this marking signal Fint is added transmitting base station ID; The acceptance division of described adjoining base station communication interface part, it is from adjoining base station receiving flag signal Fint, and the transmitting base station title of this marking signal is notified near terminal determination portion unit side via uplink scheduling section; Near terminal determination portion unit side, it is result of determination near described demodulation section is inputted the unit side sent of mobile terminal each communication, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, be each communication in mobile terminal whether interference is brought in the base station of sending marking signal Fint, the mobile terminal that brings this interference is notified to uplink scheduling section; Uplink scheduling section, it is according to the described notice near terminal determination portion described unit side, and the upstream data that the restriction of indication control signal generating unit becomes the mobile terminal of cause of failures sends; And the control signal generating unit, it generates control signal by this indication to the mobile terminal that the base station of sending described marking signal is brought interference, makes the transmission rate of temporary transient reduction upstream data or temporarily stops the transmission of upstream data.

A sixth aspect of the present invention provides the base station of using in a kind of wireless communication system, described wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that, described base station has: receive radio section, it receives wireless signal; Demodulation section, it carries out demodulation to the output signal that receives radio section; In abutting connection with the received signal power calculating part, it is according to the signal that obtains by demodulation, according to each unit of whole adjacent units, measure from the mobile terminal in this unit in abutting connection with received signal power Pcell n, wherein, n=1～N, N are the adjacent unit numbers; Always in abutting connection with the received signal power calculating part, it adds up in abutting connection with received signal power Pcell n this, calculates always in abutting connection with received signal power Pother; Comparing section, it exports comparative result to always comparing in abutting connection with received signal power and threshold power Pth; Send the destination base station determination section, it is with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, sort according to size order in abutting connection with received signal power Pcell 1～Pcell N described, determine the as a token of transmission destination base station of signal of the base station corresponding with upper m unit after sequence, perhaps decision and the transmission destination base station of signal as a token of in abutting connection with the base station of unit corresponding to received signal power more than described threshold value Pth2 in received signal power Pcell 1～Pcell N; The sign generating unit, it is with reference to described comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, the request that generates reduces the marking signal Fint that disturbs, and is input to the adjoining base station communication interface part to the additional transmitting base station title of this marking signal with after sending the destination base station title; The sending part of described adjoining base station communication interface part, it sends to the transmission destination base station with this marking signal Fint; The acceptance division of described adjoining base station communication interface part, it is from adjoining base station receiving flag signal Fint, and the transmitting base station title of this marking signal is notified near terminal determination portion unit side via uplink scheduling section; Near terminal determination portion unit side, it is result of determination near described demodulation section is inputted the unit side sent of mobile terminal each communication, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, be each communication in mobile terminal whether interference is brought in the base station of sending marking signal Fint, the mobile terminal that brings this interference is notified to uplink scheduling section; Uplink scheduling section, it is according to the described notice near terminal determination portion described unit side, and the upstream data that the restriction of indication control signal generating unit becomes the mobile terminal of cause of failures sends; And the control signal generating unit, it generates control signal by this indication to the mobile terminal that the base station of sending described marking signal is brought interference, makes the transmission rate of temporary transient reduction upstream data or temporarily stops the transmission of upstream data.

Description of drawings

Fig. 1 can use network structure of the present invention.

Fig. 2 is that the mobile terminal in 3 unit, in adjacent cells brings the schematic diagram of interference to the base station of paying close attention to the unit.

Fig. 3 is the further explanatory drawings of received signal power.

Fig. 4 is the handling process of the base station that is interfered in the first embodiment.

Fig. 5 is the handling process of the base station of the mobile terminal that brings interference of containing in the first embodiment.

Fig. 6 is the key diagram of determination methods that might bring the mobile terminal of interference.

Fig. 7 is the key diagram of an example of public guide frequency (pilot) signal in the W-CDMA system.

Fig. 8 might bring the handling process of the mobile terminal of interference for judgement.

Fig. 9 is the structure of the base station of the first embodiment.

Figure 10 is the key diagram of the second embodiment.

Figure 11 is the handling process of the base station that is interfered in the second embodiment.

Figure 12 is other handling process of the base station that is interfered in the second embodiment.

Figure 13 is the structure chart of the base station of the second embodiment.

Figure 14 is the network structure of the W-CDMA system of existing 3GPP specification.

Figure 15 is in 2 unit, mobile terminal brings the schematic diagram of interference to the base station of adjacent cells in unit.

Figure 16 be explanation from the interference-limited of adjacent cells the figure of Radio Resource.

Embodiment

(A) the first embodiment

(a) network configuration

Fig. 1 can use network structure of the present invention, is connected with a plurality of base station BTS 1～BTSn on core network CN, and each base station can communicate with the mobile terminal MS ij in wireless mode and unit CL1～CLn.Core network CN has core network shown in Figure 14 and radio network control apparatus both sides' function.And each base station and adjacent base station connect with wired mode (perhaps, for example utilizing the wireless mode of microwave section), have the interface of intercommunication mutually.The network configuration of this Fig. 1 is for example at 3GPP TR25.897V0.3.0(2003-08) in the network mentioned.

Mobile terminal MS 2j, MS3k that Fig. 2 is illustrated in adjacent cells CL2 in 3 unit CL1～CL3,3 bring the situation of interference to the base station BTS 1 of paying close attention to unit CL1.In Fig. 2, for convenience of explanation, element number is made as 3.And in these 3 unit, up link is used identical frequency band.

When paying close attention to the base station BTS 1 of unit CL1, mobile terminal MS 21, MS22 in adjacent cells CL2 communicate with base station BTS 2, the uplink signal that sends from this mobile terminal MS 21, MS22 also can arrive the base station BTS 1 of paying close attention to unit CL1, becomes interference signal.In this situation, even not bringing to disturb or bring to base station BTS 1, the mobile terminal that is not present in the mobile terminal MS 23 of unit side or is present in the unit side etc. of the opposition side of paying close attention to base station BTS 1 do not disturb its perturbed force very weak yet.Similarly, the mobile terminal MS 32 in adjacent cells CL3 communicates with base station BTS 3, and the uplink signal that sends from this mobile terminal MS 32 also can arrive the base station BTS 1 of paying close attention to unit CL1, becomes interference signal.

(b) received signal power

As shown in Figure 3, total received signal power P of receiving of base station BTS 1 is from the received signal power Pa of the mobile terminal in this unit CL1 with from total adjacent reception signal power P of the mobile terminal in adjacent cells CL2, CL3 _OtherSummation (P=Pa+P _Other) (ignoring thermal noise herein).Epigyny device in core carries out Call Admission Control (call admission control), monitors that the maximum in base station BTS 1 is allowed received signal power P _maxWhether below set point, if below set point, refuse the admittance of the new calling of the mobile terminal request in this base station BTS 1 with the difference of total received signal power P, if more than set point, admit this calling.Therefore, if total adjacent reception signal power P _OtherIncrease, reduce this power P _Other, effective use of this and Radio Resource interrelates.

The processing of the base station that (c) is interfered

In base station BTS 1, measure the total adjacent reception signal power P from whole adjacent cells _Other(step 201).Interference power P _OtherAssay method as follows: total received signal power of measuring base station BTS 1, and, as the total received signal power of expectation power measurement from the whole mobile terminals in the subordinate unit, deduct this expectation power from total received signal power of this base station BTS 1, thereby obtain interference power P _Other

Then, more total adjacent reception signal power P _OtherWith threshold power P _th(step 202) is if total adjacent reception signal power is (P more than threshold power _Other〉=P _th), base station BTS 1 sends marking signal (flag single) F that is used for the request reduce disturbance to whole adjacent base stations _int(step 203).In addition, as described later, receive this marking signal F _intAdjacent base station BTS2,3 couples of subordinaties' of BTS mobile terminal among be positioned near the mobile terminal of paying close attention to base station BTS 1 side unit end and carry out within a certain period of time, the data transfer rate when reducing up link and sending or disapprove the control of transmission.Thereby reduce total adjacent reception signal power P _Other

Afterwards, wait for through the scheduled time (step 204), if through the scheduled time, repeat above-mentioned steps 201 processing afterwards.And, in step 202, if total adjacent reception signal power is less than threshold power (P _Other＜P _th), because disturbing little being left intact, wait for through the scheduled time (step 204), if through the scheduled time, repeat above-mentioned steps 201 processing afterwards.

(d) contain the processing of the base station of the mobile terminal that brings interference

Fig. 5 is containing in the first embodiment base station of bringing the mobile terminal of interference, the handling process of for example base station BTS 2.

Base station BTS 2 monitors whether receive marking signal F _int(step 301) be not if receive marking signal F _int, wait for through the scheduled time (step 304), if through the scheduled time, repeat above-mentioned steps 301 processing afterwards.

On the other hand, in step 301, if receive marking signal F _int, judging might be to having sent this marking signal F _intBase station BTS 1 bring the mobile terminal (step 302) of interference.That is, identification is present in and has sent marking signal F _intThe unit side of base station side near mobile terminal.

If bring the judgement of the mobile terminal of interference to finish to base station BTS 1, adjacent base station BTS2 controls by scheduling feature, in order to temporarily reduce the transmission rate of the upstream data of this mobile terminal, perhaps, temporarily stops the transmission (step 303) of upstream data.Then, wait for through the scheduled time (step 304), if through the scheduled time, repeat above-mentioned steps 301 processing afterwards.

The transmission of upstream data is limited in and does not receive marking signal F _intThe time and mobile terminal finish when not being present in unit side.In addition, also can be after sending the restriction beginning through finishing during certain hour.

As mentioned above, if receive the marking signal F of request reduce disturbance _int, temporary transient minimizing might bring the transmission rate of upstream data of the mobile terminal of interference, perhaps, temporarily stops the transmission of upstream data, therefore, can reduce the interference to base station BTS 1.

(e) judgement of the mobile terminal of unit side

Fig. 6 is the key diagram of determination methods that brings the mobile terminal of interference.

As shown in Figure 6, the mobile terminal MS 22 that is communicating with base station BTS 2 is present in the borderline region of unit CL1, CL2 of base station BTS 1, BTS2 or during boundary vicinity, from two base station receiving downlink signals.Comprise common pilot signal (CPICH signal) in each down link signal.Mobile terminal MS 22 is measured received power Pl, the P2 from each common pilot signal of base station BTS 1, BTS2, if the absolute value of the difference Δ P of two received powers is below set point, be judged as be present near unit side, might be to described marking signal F _intTransmitting base station BTS1 bring interference, if more than set point, being judged as can be to marking signal F _intTransmitting base station BTS1 bring interference.

Fig. 7 is the key diagram that an example of the common pilot signal that each base station from the W-CDMA system sends is shown, and 1 frame is 10msec and is made of 15 time slot S0～S14.But the physical channel structure of down link is not depended in the present invention.

All exist 1 Primary Common Control Physical Channel P-CCPCH and the Common Pilot Channel CPICH(CPICH in should example to represent Primary Common Pilot Channel P-CPICH for each unit in the common signal channel of down direction).Wherein, Primary Common Control Physical Channel P-CCPCH is used for sending BCH(and reports information), comprise the base station code of the information relevant with the base station or adjacent base station etc. in this BCH.On the other hand, Common Pilot Channel CPICH is used for sending common pilot signal, utilize base station code (for example, the intrinsic scrambler in unit (Scramble code) of subordinate unit, this base station) and CPICH with channel code (channelization code) with the expansion of this common pilot signal, send.Use this common pilot signal control channel supposition or received power mensuration etc. at receiver side.In addition, in Fig. 7, S-SCH is auxiliary synchronization channel (secondary synchronization channel).

Mobile terminal MS 22(is with reference to Fig. 6) use base station code and the CPICH channel code of base station BTS 2 in communication, separate the common pilot signal of base station BTS 2 transmissions from this communication, measure the received power P2 of this common pilot signal.And, the BCH(that sends according to Primary Common Control Physical Channel P-CCPCH reports information), obtain the base station code of adjacent base station BTS1, use this base station code and CPICH channel code, separation is measured the received power P1 of this common pilot signal from the common pilot signal that adjacent base station BTS1 sends.

Each mobile terminal that is communicating with base station BTS 2, for example mobile terminal MS 22 are measured the received power (step 401) via the common pilot signal of the Common Pilot Channel CPICH transmission of base station BTS in communicate by letter 2.Then, the BCH(that sends according to PCCPCH reports information), obtain the base station code (scrambler) (step 402) of adjacent base station BTS1, use this base station code and CPICH channel code, separation is measured the received power P1(step 403 of this common pilot signal from the common pilot signal that adjacent base station BTS1 sends).

If complete the mensuration of received power P1, P2, the absolute value (Δ P=|P2-P1|) (step 404) of the difference Δ P of received power P2, the Pl of the common pilot signal of base station BTS 2 and adjacent base station BTS1 during mobile terminal generates and certainly communicates by letter judges whether this difference Δ P is threshold value above (step 405).If poor Δ P is more than threshold value, be judged as be not present in adjacent base station BTS1 near, to the base station name of its judged result additional neighbor base station, notice is given base station BTS 2(step 406 in communication).In addition, judged result is notified to base station BTS 2 in communication, but the judged result in this situation is not to notify, and can not notify yet herein.

On the other hand, if poor Δ P is below threshold value, is judged as and is present near unit side, to the base station name of its judged result additional neighbor base station, notice is given base station BTS 2(step 407 in communication).Perhaps, only send expression and might bring the marking signal of interference to adjacent cells.

Base station BTS 2 identifies to marking signal F according to the judged result that receives from each mobile terminal _intTransmitting base station BTS1 bring the mobile terminal of interference, by scheduling feature, temporarily reduce the transmission rate of the upstream data of this mobile terminal, perhaps, temporarily stop the transmission of upstream data.

(f) structure of base station

Fig. 9 illustrates the structure of the base station of the first embodiment.

Receiving radio section 11 will amplify by the wireless signal that antenna 10 receives, and frequency is carried out down-conversion (down convert) and made it become base band (base band) from high frequency band.Total received signal power determination part 12 is measured total received signal power P according to the output signal that receives radio section 11, demodulation section 13 utilizes the intrinsic scrambler of each terminal to carry out despreading after quadrature demodulation, further utilize predetermined channel code to carry out despreading, be used for measuring signal from total received signal power of subordinate's mobile terminal, (3) from the unit side notification signal of mobile terminal etc. thereby separate (1) user data or control signal, (2).In addition, the below will be called desired signal power (perhaps expecting power) from total received signal power of the whole mobile terminals in communication.

The signal that is used for the mensuration desired signal power obtains by utilizing the intrinsic solution extended code of mobile terminal to carry out to received signal despreading.The data of 14 pairs of demodulation of lsb decoder or control signal are implemented the decoding processing, flase drop is corrected and processed, with data and the control information output that obtains.

The signal measuring desired signal power Pa that desired signal power calculating part 15 uses despreading to obtain, interference power calculating part 16 is by following formula

P _other＝P-Pa （1），

The received signal power P that will receive from the mobile terminal of whole adjacent cells _OtherBe calculated as interference power.In addition, the below is with received signal power P _OtherBe called total adjacent reception signal power.The more total adjacent reception signal power of comparing section 17 P _OtherWith threshold power P _th, comparative result is input to sign generating unit 18.Sign generating unit 18 is with reference to comparative result, if total adjacent reception signal power is (P more than threshold power _Other〉=P _th), generate the marking signal F that is used for request adjacent base station reduce disturbance _int, be input to adjacent base station communication interface part 19.The sending part 19a of adjacent base station communication interface part 19 is to this marking signal F _intAdditional transmitting base station ID sends it to whole adjacent base stations.In addition, if total adjacent reception signal power is below threshold power, do not generate marking signal.

On the other hand, the acceptance division 19b of adjacent base station communication interface part 19 receives marking signal F from adjacent base station _intThe time, will receive this marking signal F _intSituation and this marking signal F _intThe transmitting base station name notify to uplink scheduling section 20.When uplink scheduling section 20 receives this marking signal reception notification, with marking signal F _intThe transmitting base station name be input near terminal determination portion 21 unit side.

Near unit side in terminal determination portion 21 input near the judged result unit side that mobile terminal in communication sends according to the processing of Fig. 8 is arranged, so near unit side, terminal determination portion 21 is according to this result, identify in each communication, whether mobile terminal is present in unit side, in other words, identify in each communication mobile terminal whether to having sent marking signal F _intThe base station bring interference, the mobile terminal that brings interference is notified to uplink scheduling section 20.

If uplink scheduling section 20 receives this notice, the upstream data of indicating 22 pairs of control signal generating units to become the mobile terminal of cause of failures sends and limits.Control signal generating unit 22 generates control signal, and this control signal is used for limiting the upstream data transmission of the mobile terminal that is instructed to.That is, make to be used for the temporary transient transmission rate that reduces upstream data control signal or, be used for temporarily stopping the control signal of the transmission of upstream data.Multiplexing unit 23 is carried out this control signal and the user data that generated by user data generating unit 24 multiplexing, coded/modulated section 25 utilizes predetermined extended code to expand when multiplex data is encoded, according to spreading result, carry out quadrature modulation, send 26 pairs of modulated output signals of radio section and implement up-conversion, High frequency amplification etc., transmitted signal is sent from antenna 27.

The mobile terminal that the signal that reception sends from antenna 27, restriction upstream data send temporarily reduces the transmission rate of upstream data or temporarily stops the transmission of upstream data.Uplink scheduling section 20 controls as follows: if do not receive marking signal F _int, perhaps, implement the minimizing of transmission rate or temporarily stop process certain hour afterwards, remove the restriction of the uplink data sending of mobile terminal.

According to the first embodiment, can reduce the interference power from adjacent cells.And according to the first embodiment, the total interference power that is subject to when the mobile terminal from adjacent cells can be asked this adjacent base station reduce disturbance during greater than set point, with reduce disturbance power, can improve the throughput of entire system.And, according to the first embodiment, by judging the mobile terminal of the generation larger interference signal that is present in elementary boundary, reduce the interference signal from this mobile terminal, thus can reduce disturbance power.

(B) the second embodiment

In the first embodiment, according to (1) formula, measure total received signal power (the total adjacent reception signal power) P from the mobile terminal of whole adjacent cells _OtherIn the second embodiment, as shown in figure 10, total received signal power (adjacent reception signal power) P from the mobile terminal in the unit is measured in each unit of whole adjacent cells cell 1～cell N _{Cell 1}～P _CellN,

By following formula

Pother = Σ_{n = 1}^{N} Pcel \ln - - - (2),

That is, with the adjacent reception signal power P of each adjacent cells _{Cell 1}～P _{Cell N}Summation calculates total adjacent reception signal power P _Other(be made as herein, after the intrinsic scrambler of each terminal range site disturbs, send upstream data.）。Utilize the scrambler of each adjacent cells will receive the signal despreading, separate the public guide frequency of each base station, thereby measure the adjacent reception signal power P of each unit of adjacent cells cell 1～cell N _{Cell 1}～P _{Cell N}

Figure 11 illustrates the handling process of the base station that is interfered in the second embodiment.

Adjacent reception signal power P from the mobile terminal in the unit is measured in each unit of whole adjacent cells cell 1～cell N _{Cell 1}～P _{Cell N}(step 501) by (2) formula, calculates total adjacent reception signal power P _Other(step 502).Then, more total adjacent reception signal power P _OtherWith threshold power P _th(step 503) is if total adjacent reception signal power is (P more than threshold power _Other〉=P _th), with adjacent reception signal power P _{Cell 1}～P _{Cell N}According to size order sort (step 504).Then, sequence is obtained with upper m, for example send for base station corresponding to the unit of upper 2 the marking signal F that is used for the request reduce disturbance _int(step 505).Identical with the first embodiment (with reference to the handling process of Fig. 5), receive this marking signal F _intAdjacent base station near the mobile terminal that is in the unit side of paying close attention to base station BTS 1 side is carried out at certain hour, the control of the data transfer rate when reducing up link and sending perhaps, disapproves the control of transmission.Thus, can reduce total adjacent reception signal power P _Other

Then, wait for through the scheduled time (step 506), if through the scheduled time, repeat above-mentioned steps 501 processing afterwards.And, in step 503, if total adjacent reception signal power is less than threshold power (P _Other＜P _th), wait for through the scheduled time (step 506), if through the scheduled time, repeat above-mentioned steps 501 processing afterwards.

Figure 12 illustrates other handling process of the base station that is interfered in the second embodiment.

Adjacent reception signal power P from the mobile terminal in the unit is measured in each unit of whole adjacent cells cell 1～cell N _{Cell 1}～P _{Cell N}(step 601) by (2) formula, calculates total adjacent reception signal power P _Other(step 602).Then, more total adjacent reception signal power P _OtherWith threshold power P _th1(step 603) is if total adjacent reception signal power is (P more than threshold power _Other〉=P _th1), retrieve adjacent reception signal power P _{Cell 1}～P _{Cell N}Among threshold value P _th2Above power (step 604), to threshold value P _th2The base station of the unit that above adjacent reception signal power is corresponding sends the marking signal F that is used for the request reduce disturbance _int(step 605).Identical with the first embodiment (with reference to the handling process of Fig. 5), receive this marking signal F _intAdjacent base station near the mobile terminal that is in the unit side of paying close attention to base station BTS 1 side is carried out within a certain period of time, the control of the data transfer rate when reducing up link and sending perhaps, disapproves the control of transmission.Thus, reduce total adjacent reception signal power P _Other

Then, wait for through the scheduled time (step 606), if through the scheduled time, repeat above-mentioned steps 601 processing afterwards.And, in step 603, if total adjacent reception signal power is less than threshold power (P _Other＜P _th2), wait for through the scheduled time (step 606), if through the scheduled time, repeat above-mentioned steps 601 processing afterwards.

Figure 13 is the structure chart of the base station of the second embodiment, and the structures different from the first embodiment of Fig. 9 are, calculate total adjacent reception signal power P _OtherStructure and definite marking signal F _intThe structure of transmitting base station.

The baseband signal despreading of the intrinsic scrambler of demodulation section 13 range sites after with quadrature demodulation, obtain despread signal, afterwards, further (for example use predetermined channel code, temporarily distribute to the code of each channel that each terminal uses) carry out despreading, separate (1) user data or control signal, (2) from the unit side notification signal of mobile terminal etc.

The despread signal that adjacent reception signal power calculating part 31 input despreadings obtain calculates that adjacent reception signal power Pcell n(n=1～N), total adjacent reception signal power calculating part 32 calculates total adjacent reception signal power P by (2) formula _OtherThe more total adjacent reception signal power of comparing section 33 P _OtherWith threshold value P _th1, comparative result is input to the transmission destination base station determination portion 34 that indicates generating unit 18 and marking signal.If total adjacent reception signal power is (P more than threshold power _Other〉=Pth), send the transmission destination base station that destination base station determination portion 34 is determined marking signal, be input to sign generating unit 18.The transmission destination base station of marking signal is with adjacent reception signal power P _{Cell 1}～P _{Cell N}According to size order sort, with upper m the base station that the unit is corresponding of sorting.Perhaps, the transmission destination base station of marking signal is adjacent reception signal power P _{Cell 1}～P _{Cell N}Among with threshold value P _th2Above base station corresponding to unit.

If total adjacent reception signal power is (P more than threshold power _Other〉=Pth), indicate that generating unit 18 generates the marking signal F that is used for the request reduce disturbance _int, to this marking signal F _intAdditional transmitting base station name and transmission destination base station name are input to adjacent base station communication interface part 19, and sending part 19a is with this marking signal F _intSend to the transmission destination base station.

On the other hand, if the acceptance division 19b of adjacent base station communication interface part 19 receives marking signal F from adjacent base station _int, receive this marking signal F to uplink scheduling section 20 notices _intSituation and this marking signal F _intThe transmitting base station name.When uplink scheduling section 20 receives this marking signal reception notification, with marking signal F _intThe transmitting base station name be input near terminal determination portion 21 unit side.

Near unit side in terminal determination portion 21 input near the judged result unit side that mobile terminal in communication sends according to the processing of Fig. 8 is arranged, therefore, near unit side, terminal determination portion 21 is according to this result, identify in each communication, whether mobile terminal is present in unit side, in other words, identify in each communication, whether mobile terminal feeds out marking signal F _intThe base station bring interference, the mobile terminal that brings interference is notified to uplink scheduling section 20.

When uplink scheduling section 20 received this notice, the upstream data transmission that 22 pairs of indication control signal generating units become the mobile terminal of cause of failures limited.Control signal generating unit 22 is made control signal according to this indication, and control signal is sent to the described mobile terminal that is instructed to, and this control signal is used to indicate the transmission rate of temporary transient minimizing upstream data or temporarily stops the transmission of upstream data.The user data that multiplexing unit 23 generates with this control signal with by user data generating unit 24 is multiplexing, via coded/modulated section 25, send radio section 26 and send to mobile terminal from antenna 27.

Limited the transmission that mobile terminal that upstream data sends temporarily reduces the transmission rate of upstream data or temporarily stops upstream data.Uplink scheduling section 20 carries out following control: if do not receive marking signal F _int, remove the restriction of the uplink data sending of mobile terminal.

According to the second embodiment, can bring into play the effect identical with the first embodiment.And, according to the second embodiment, when total adjacent reception signal power (interference power) increases, reduce the interference power from the adjacent cells that brings larger interference, so can improve the throughput of entire system.

Claims

1. wireless communication system, it has mobile terminal and a plurality of base station, and the mobile terminal in described a plurality of base stations and subordinate unit communicates, it is characterized in that,

Described a plurality of base station has respectively:

Receive radio section, it receives wireless signal;

Total received signal power determination part, it measures total received signal power P according to the output signal that receives radio section;

Demodulation section, it carries out demodulation to the output signal that receives radio section;

The desired signal power calculating part, it is according to the signal that obtains by demodulation, calculates total received power from the whole mobile terminals in communication as desired signal power Pa;

The interference power calculating part, it adopts formula Pother=P-Pa, calculates total interference power Pother that the mobile terminal in whole adjacent units receives as always in abutting connection with received signal power;

Comparing section, it exports comparative result to always comparing in abutting connection with received signal power and threshold power Pth;

The sign generating unit, it is with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, generate the request adjoining base station and reduce the marking signal Fint that disturbs, be input to the adjoining base station communication interface part;

The sending part of described adjoining base station communication interface part, it sends to whole adjoining base stations after this marking signal Fint is added transmitting base station ID;

The acceptance division of described adjoining base station communication interface part, it is from adjoining base station receiving flag signal Fint, and the transmitting base station title of this marking signal is notified near terminal determination portion unit side via uplink scheduling section;

Near terminal determination portion unit side, it is result of determination near described demodulation section is inputted the unit side sent of mobile terminal each communication, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, be each communication in mobile terminal whether interference is brought in the base station of sending marking signal Fint, the mobile terminal that brings this interference is notified to uplink scheduling section;

Uplink scheduling section, it is according to the described notice near terminal determination portion described unit side, and the upstream data that the restriction of indication control signal generating unit becomes the mobile terminal of cause of failures sends; And

The control signal generating unit, it generates control signal by this indication to the mobile terminal that the base station of sending described marking signal is brought interference, and make the transmission rate of temporary transient reduction upstream data or temporarily stop the transmission of upstream data,

described mobile terminal is measured the received power P2 of the common pilot signal that the base station from communication and adjoining base station respectively receive, P1, calculate this received power P2, the absolute value delta P of the difference of P1, if absolute value delta P is less than threshold value, be judged to be adjoining base station is brought interference, if absolute value delta P is more than threshold value, be not judged to be adjoining base station is brought interference, after the base station title of additional adjoining base station, result of determination is notified to the base station in communication as near result of determination described unit side, when adopting described control signal restriction upstream data to send, the temporary transient transmission that reduces the transmission rate of upstream data or temporarily stop upstream data.

2. wireless communication system, it has mobile terminal and a plurality of base station, and the mobile terminal in described a plurality of base stations and subordinate unit communicates, it is characterized in that,

Described a plurality of base station has respectively:

Receive radio section, it receives wireless signal;

In abutting connection with the received signal power calculating part, it is according to the signal that obtains by demodulation, according to each unit of whole adjacent units, measure from the mobile terminal in this unit in abutting connection with received signal power Pcell n, wherein, n=1～N, N are the adjacent unit numbers;

Always in abutting connection with the received signal power calculating part, it adds up in abutting connection with received signal power Pcell n this, calculates always in abutting connection with received signal power Pother;

Send the destination base station determination section, it is with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, sort according to size order in abutting connection with received signal power Pcell 1～PcellN described, determine the as a token of transmission destination base station of signal of the base station corresponding with upper m unit after sequence, perhaps decision and the transmission destination base station of signal as a token of in abutting connection with the base station of unit corresponding to received signal power more than described threshold value Pth2 in received signal power Pcell1～Pcell N;

The sign generating unit, it is with reference to described comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, the request that generates reduces the marking signal Fint that disturbs, and is input to the adjoining base station communication interface part to the additional transmitting base station title of this marking signal with after sending the destination base station title;

The sending part of described adjoining base station communication interface part, it sends to the transmission destination base station with this marking signal Fint;

3. the interference reduction method in a wireless communication system, this wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that,

Carry out following steps in each of described a plurality of base stations:

Measure total received signal power P according to the output signal of the reception radio section that receives wireless signal;

The output signal that receives radio section is carried out demodulation;

The desired signal power calculation procedure according to the signal that obtains by demodulation, is calculated total received power from the whole mobile terminals in communication as desired signal power Pa;

The interference power calculation procedure adopts formula Pother=P-Pa, calculates total interference power Pother that the mobile terminal in whole adjacent units receives as always in abutting connection with received signal power;

To always comparing in abutting connection with received signal power and threshold power Pth, export comparative result;

Sign generates step, with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, generate the request adjoining base station and reduce the marking signal Fint that disturbs;

To sending to whole adjoining base stations after the additional transmitting base station ID of this marking signal Fint;

From adjoining base station receiving flag signal Fint, identify the transmitting base station title of this marking signal;

Near the result of determination unit side that mobile terminal in each communication that input obtains by described demodulation is sent, according near result of determination this unit side, whether the mobile terminal of identifying in each communication is present in unit side, and namely whether the mobile terminal in each communication brings interference to the base station of sending marking signal Fint;

In the situation that interference is brought in the base station of sending marking signal Fint, the upstream data that the indication restriction becomes the mobile terminal of cause of failures sends; And

By this indication, generate control signal and also send to the mobile terminal that the base station of sending described marking signal is brought interference, make the transmission rate of temporary transient reduction upstream data or temporarily stop the transmission of upstream data,

Carry out following steps in described mobile terminal:

Measure received power P2, the P1 of the common pilot signal that the base station from communication and adjoining base station respectively receive, calculate the absolute value delta P of the difference of this received power P2, P1, if absolute value delta P is less than threshold value, be judged to be adjoining base station is brought interference, if absolute value delta P is more than threshold value, be not judged to be adjoining base station is brought interference, after the base station title of additional adjoining base station, result of determination is notified to the base station in communication as near result of determination described unit side; And

When adopting described control signal restriction upstream data to send, temporarily reduce the transmission rate of upstream data or temporarily stop the transmission of upstream data.

4. the interference reduction method in a wireless communication system, this wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that,

Carry out following steps in each of described a plurality of base stations:

Output signal to the reception radio section that receives wireless signal is carried out demodulation;

According to the signal that obtains by demodulation, according to each unit of whole adjacent units, measure from the mobile terminal in this unit in abutting connection with received signal power Pcell n, wherein, n=1～N, N are the adjacent unit numbers;

This is added up in abutting connection with received signal power Pcell n, calculate always in abutting connection with received signal power Pother;

Send the destination base station deciding step, with reference to this comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, sort according to size order in abutting connection with received signal power Pcell 1～PcellN described, determine the as a token of transmission destination base station of signal of the base station corresponding with upper m unit after sequence, perhaps decision and the transmission destination base station of signal as a token of in abutting connection with the base station of unit corresponding to received signal power more than described threshold value Pth2 in received signal power Pcell1～Pcell N;

With reference to described comparative result, if always in abutting connection with received signal power Pother more than threshold power Pth, the request that generates reduces the marking signal Fint that disturbs, and sends to the transmission destination base station to the additional transmitting base station title of this marking signal with after sending the destination base station title;

Carry out following steps in described mobile terminal:

5. the base station of using in a wireless communication system, described wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that,

Described base station has:

Receive radio section, it receives wireless signal;

The interference power calculating part, it adopts formula Pother=PPa, calculates total interference power Pother that the mobile terminal in whole adjacent units receives as always in abutting connection with received signal power;

The control signal generating unit, it generates control signal by this indication to the mobile terminal that the base station of sending described marking signal is brought interference, makes the transmission rate of temporary transient reduction upstream data or temporarily stops the transmission of upstream data.

6. the base station of using in a wireless communication system, described wireless communication system have with the subordinate unit in a plurality of base stations of communicating of mobile terminal, it is characterized in that,

Described base station has:

Receive radio section, it receives wireless signal;