CN1314061A

CN1314061A - Base station

Info

Publication number: CN1314061A
Application number: CN 99809806
Authority: CN
Inventors: M·戈尔德博格; F·施雷布; P·斯彭尼曼
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 1998-06-17
Filing date: 1999-06-15
Publication date: 2001-09-19
Anticipated expiration: 2019-06-15
Also published as: DE19827027A1; DE19827027C2; EP1088464A1; CN1114329C; WO1999066750A1

Abstract

The invention relates to a base station of a radio communication system comprising at least one PCM link, characterised in that said PCM link is connected to a switching system for filtering signals from the PCM link to the base station and for relaying non filtered signals of the PCM link to another base station of the radio communication system.

Description

The base station

The present invention relates to the base station of a kind of base station of radio communications system, particularly mobile radio or wireless user's Access Network.

In radio communications system, the for example reasonable sound of information, pictorial information or other data, utilize electromagnetic wave to pass through a radio transmission station and a radio reception station, for example the radio interface between base station or the mobile radio station transmits under the situation of mobile radio system.At this, electromagnetic emission is with realizing for the carrier frequency in the relevant system intialization frequency band.In GSM mobile radio system (global system for mobile communications), carrier frequency is in 900MHz, 1800MHz, 1900MHz scope.In the future, by radio interface, for example as UMTS (multichannel mobile communication system) or other in the 3rd generation system adopt the mobile radio system of CDMA and TD/CDMA transmission method, the regulation carrier frequency is in being about the scope of 2000MHz.

From second generation mobile radio system, GSM (global system for mobile communications) prior art level for example, wherein from 1995, Vieweg publishing house publishes, J.Biala writes " mobile radio and intelligent network " known, be to cover the effective service area of radio, a plurality of base stations are for example coupled together with annular or star and base station controller by a kind of Abis interface.Such structure can be known from technical merit 122 above-mentioned and 123 pages especially.The target of this structure is the best PCM of use communication line, and this best the use is to set up communication line at base station controller with between about the base station and under the situation of PCM30 circuit, have for example 2Mb/s of a high rate of data signalling.

Mobile radio system with a kind of classification radio plot structure for the optimum utilization radio resource, at first is used in the densely populated area, has in super average traffic area or the mansion.Radio plot level orlop, for example Microcell or picocell all only cover geographically the very effective service area of limited radio at this.According to as the architecture of base station that little base station of 1 or 2 carrier frequency for example only is provided, these little effective service areas can provide just the very radio resource of limited quantity.

When the known signal allocation structure of above-mentioned technical merit is used the transmission on the PCM circuit of drawing from base station controller means lower floor in the radio plot level of classification radio plot structure, because PCM circuit rent is high and the not satisfied utilization of PCM circuit transmission capacity, thereby has a high funds expenditure, because the base station of each termination all only has a limited number of radio channels and a limited number of base stations can only be terminated on each PCM circuit of one according to the prior art level.

Task of the present invention provides a kind of above-mentioned shortcoming and preferred base station of adopting classification radio plot structure avoided.This task will be solved by the feature of claim 1 according to the present invention.The preferred embodiment of the invention will be obtained by dependent claims.

According to the present invention, the base station that a radio communications system of a PCM circuit is arranged, have a switchgear and be used to leach the signal converting of the PCM circuit that respectively is identified for signal of base station and is used for will not leaching from the PCM circuit another base station to radio communications system on the circuit that lead connects, wherein the PCM link tester is toward switchgear.

This structure advantageously makes the base station that terminates on the PCM circuit leach the signal that is identified for it, and the signal converting on the PCM circuit that will not leach becomes possibility to another base station, and with this, the base station that quantity is bigger can terminate on the PCM circuit.When the application in presenting a demonstration property of mansion, for example all base stations that are arranged in one deck all can provide signal by a PCM circuit, and with this transmittability of using the PCM circuit to provide best.In addition, advantageously reduce interface quantity or switchgear quantity in the base station controller, because the quantity of the PCM circuit of drawing from base station controller has reduced, and can not consider in base station controller or relevant base station with an additional distributing equipment interior or in addition, when setting up base station controller and base station, place demand and place issue have additionally been reduced with this.

First preferred structure according to the present invention, the signal that does not leach are then by the base station of another PCM circuit switching to other.This structure advantageously makes the PCM circuit connect the loop by principle by base station of the present invention becomes possibility, and wherein this stands in will leach in the switchgear and respectively is identified for signal of base station.

Another structure according to the present invention, the signal that is not filtered off are transferred to other base station by at least one ISDN-SO-communication line.Thus, can a preferred communication line that expense is suitable to the communication line of linking other base station, wherein on the one hand, when setting up radio net, by may termination other base station of One's name is legion reach very big flexibility, on the other hand, than the trunk line of the low rented ISDN-SO-communication line of the trunk line of PCM circuit, reach very big flexibility by generally because of the little rent of transmission capacity is also low.On the base station that only has one or more carrier frequency, to each carrier frequency, it is enough that an ISDN-SO-communication line is all arranged, and with this, this enforcement structure is particularly suitable for being used in the understructure or the femto cell of grading type wireless electrical communication system radio plot.In addition, whereby also can be with one or more other base stations for example via respectively being that one or more ISDN-SO-communication line preferably terminates on the base station that has switchgear, like this, line cost has reduced and has set up radio net flexibly and has been guaranteed.

According to the present invention relates to further expanding of above-mentioned enforcement structure, the signal that is not filtered out is transferred to other base station by at least one additional ISDN-SO-communication line via automatic telephone communication line (Waehlverbindung) foundation.This has special advantage, promptly depends under the situation of telephone traffic of radio interface, just sets up and can use one or more additional carrier frequency to other base station is additional by simple automatic telephone communication line, and can discharge again after the use finishing.Like this, just cost saving greatly, because additional ISDN-SO-communication line for example can only exist when the demand of reality, and other base station can only be satisfied normal communication service by the communication line of limited quantity in addition.

According to another expansion that the present invention relates to above-mentioned enforcement structure, the conversion of signals of the PCM circuit that switchgear will not be filtered becomes ISDN-SO-communication line or other ISDN-SO ^★The signal of-communication line, and with corresponding ISDN-SO-communication line or ISDN-SO ^★The conversion of signals of-communication line becomes the signal of PCM circuit.This implement structure optimization make the base station can be for example not only by PCM circuit but also other the part by ISDN-SO-communication line and radio communications system, base station as other couples together, and become respectively conversion, so that to not only becoming each applied form at up direction but also in the conversion of signals of down direction transmission for other transformat.

Describe embodiments of the invention in detail below in conjunction with accompanying drawing.

Shown in the figure

Fig. 1 is a block diagram of briefly representing (prior art level) radio communications system, is in particular the block diagram of a mobile radio system,

Fig. 2 is the block diagram with radio communications system of 2 base stations of the present invention,

Fig. 3 is the block diagram of radio communications system of the present invention, and wherein the base station is connected with other base station by an ISDN-SO-communication line or a PCM communication line, and

The block diagram of Fig. 4 a plurality of base stations that respectively link to each other by ISDN-SO-communication line PCM and permanent and temporary transient for radio communications system of the present invention has.

The radio communications system that Fig. 1 exemplarily shows is equivalent to the part of known GSM mobile radio system.This structure may be used on third generation mobile radio system or the access network system also.Such radio communications system comprises one or more SC of switching center, and the SC of these switching centers leads to the inlet of a fixed network PSTN or a mobile radio telephone PLMN each other in net or foundation.In addition, the SC of these switching centers links to each other with each at least one base station controller BSC.Each base station controller BSC all has a communication line that is connected at least one base station BS, this base station BS set up by radio interface and disconnect be connected to one or more radio stations for example mobile radio station MS communicate to connect circuit.

But each base station BS is with the equal area of effective service of radio technical resources.According to shown in Figure 1, for example base station BS is all effectively served a zone of representing as hexagon simply, and radio plot is generally all seen in this zone as.The border of each sub-district is all overlapping, and like this, for example a mobile radio station MS can set up a communication line at least 2 base station BSs in the overlay region.Base station BS is with the base station controller BSC primordial station BSS of system.

Each part of this base station system BSS illustrates in Fig. 2.Base station controller BSC can constitute individual or can constitute with base station BS or with other part of radio communications system.

First base station BS 1 by PCM circuit PCM (a, b) is connected with base station controller BSC except that the part and equipment such as tranmission/reception apparatus (this equipment does not provide) by standard of base station, also has a switchgear SE in Fig. 2.This switchgear SE is used for leaching the signal a that is identified for first base station BS 1.Simultaneously, the signal b that is not filtered off of PCM circuit PCM (a, b) is transferred to second base station BS 2 that for example provides, and wherein this station for example also has a switchgear SE of the present invention, and signal can be connected to one or more other base stations.Signal between relevant base station is transmitted in this and for example can realizes by a PCM circuit equally.

For example, a PCM30 circuit constitutes a PCM circuit, as employed circuit in the GSM mobile radio system.This circuit has bandwidth 2Mb/s.Each carrier frequency can transmit with rate of data signalling 2 * 64kb/s by the PCM30 circuit at network side in one direction by the signal of radio interface transport, can provide 15 carrier frequency at most with this.By this, for example may realize nearly being connected in series of 15 base stations in theory, all there is a carrier frequency each base station.Quantity according to used carrier frequency, can realize on the PCM30 circuit, one or more time slot allocation for the addressing of each base station BS-base station BS by most changeless distribution, because each base station BS can both be discerned the time slot that is under the jurisdiction of it, and can leach the signal of passing to it.This feature can be used on the PCM24 circuit in the same way, and this PCM24 circuit provides 12 carrier frequency at most according to its less bandwidth.

By meeting the series circuit of the base station BS of connecting loop switching PCM circuit PCM in principle, but it is not suitable with first selection scheme as shown in Figure 3, but but always favourable and simple realization in radio communications system with classification radio plot structure.This point is effectively served just effective to implement radio in mansion especially, in this radio is effectively served, from base station controller BSC, for example must all arrange a PCM circuit and accurately plan base station BS is set, so that obtain PCM circuit line arrangement best at each floor of mansion.In addition, in this case, at the inner or outside equipment that each bar PCM circuit of distribution must be set of base station controller BSC, with this additionally place needs of problems just appears.

But in Fig. 3, provided solution the present invention and addressed this problem scheme with second selection scheme.Here, first base station BS 1 is connected with central base station controller BSC by PCM circuit PCM (a, b).Switchgear SE in first base station BS 1 leaches by next the determining of PCM circuit PCM (a, b) and is used for this signal of base station a, and the signal b that will not be filtered off converts the signal of ISDN-SO-communication line ISDN-SO (b) to.Other second base station BS 2 depending under the quantity situation of used carrier frequency, is being connected with first base station BS 1 by one or more ISDN-SO-communication line ISDN-SO.At this, switchgear SE or first base station BS 1 and second base station BS 2 all have the possibility to the ISDN-SO-telecommunications line termination.

When the possibility that has the ISDN-SO-telecommunications line termination, switchgear SE might make first base station BS 1 not only link to each other with base station controller BSC or other base station BS by the PCM circuit but also by the ISDN-SO-communication line in the same manner.During switchgear SE in exemplarily realizing all base stations of radio communications system, can select one by this and be connected on the relevant base station very flexibly with the corresponding to communication line of relevant requirements.Also can imagine at this, base station controller BSC be arrived by many ISDN-SO-telecommunications line terminations in a base station, and for example an ISDN-SO-communication line is transferred to other base station, need not carry out according to conversion of the present invention.

Particularly advantageously second alternate embodiments in Fig. 3 to network planning generation effect.So for example can imagine, in the mansion of multilayer is arranged, a base station controller BSC only is installed.From this point, for example one or more layers a plurality of base station BSs can be equipped with according to switchgear SE of the present invention, and are connected with base station controller BSC by a unique PCM circuit.The base station BS of switchgear SE is equipped with by each, but by equal a plurality of other base station BSs of termination of ISDN-SO-circuit.For example, with this, a kind of star circuit and the series circuit that can imagine base station BS make up, and guarantee that base station BS has a best configuration almost need not consider trunk line.Influence also is positive in this respect, and promptly general ISDN-SO-communication line ISDN-SO compares almost everywhere with PCM circuit PCM all can be from physically being provided.In addition, advantageously reduce in base station controller BSC the quantity of PCM circuit with the required termination of exchange logic of the inside that belongs to this.

In addition, the advantage that ISDN-SO-communication line ISDN-SO has is, the transmittability of 144kb/s is just much of that to transmitting a CF signal on the one hand, and the expense of the leased line of Xing Chenging reduces a lot than the expense of renting a PCM circuit on the other hand.For discerning used interface, generally an ISDN-SO-communication line is called basic termination.By same mode, physical interface also may be a UKO interface.The advantage that this interface has be possible make 2 far away by distance between the equipment of telecommunications line termination, wherein in this case, set up communication line by UKO interface and fixed network mostly.Article one, it is 1 kilometer that pure ISDN-SO-communication line generally can only reach ultimate range, this distance at first be applied in picocell for example image height floor mansion be enough.The operator of radio communications system is generally making great efforts to provide trunk line to make the expense factor as far as possible little, so that provide expense rational expenses standard for the user of radio communications system.

Another advantage of ISDN-SO-communication line is that it can be set up by the automatic telephone communication line of standard or disconnect when needed simply.Like this, when the limited regional telephone traffic of occupation of land is high, then can inserts one or more carrier frequency and improve effective service ability, as long as relevant base station BS all has corresponding apparatus and the part that uses this carrier frequency.For example, this point is usually only having several hrs or is having several days in 1 year when the telephone traffic peak occurring and holding sports in a week, be significant, because advantageously can cancel the expense of a communication line of permanent maintenance and only when actual needs, just assume charge.

Fig. 4 shows another embodiment that the present invention has above-mentioned feature.At this, first base station BS 1 is connected with base station controller BSC by PCM communication line PCM (a, b, c, d, e, f).The switchgear SE that is provided with at first base station BS 1 leaches the signal a that determines to be used for first base station BS 1 from PCM communication line PCM (a, b, c, d, e, f).In addition, it also can convert signal b, the c from PCM communication line PCM (a, b, c, d, e, f) to and be used for 2 ISDN-SO-communication line ISDN-SO (b) and ISDN-SO ^★(c) signal b, c, and with on these signal convertings to the second base station BS 2.This second the additional ISDN-SO-communication line ISDN-SO that provides ^★(c) here-as dotted line explanation-just one temporarily be connected to second ISDN-SO-communication line on the base station BS 2, and as mentioned above, only set up when needed or disconnect, to reach endemic raising transmittability.

Switchgear SE in first base station BS 1 additionally with other, signal d that be not filtered off or that be converted, e, f be connected to the 3rd base station BS 3 that a switchgear SE is equally also arranged by another PCM circuit PCM (d, e, f).The switchgear SE of the 3rd base station BS 3 leach equally from PCM circuit PCM (d, e, f) determine be used for this 3rd signal of base station d, and other signal e, the f that will not leach in addition convert two ISDN-SO-communication line ISDN-SO (e) and ISDN-SO (f) to and these signals are connected to the 4th base station BS 4 and the 5th base station BS 5.The series circuit and the star circuit preferred compositions possibility of radio communications system base station BS have been illustrated by Fig. 4.

When all base station BS 1-BS5 are equipped with switchgear SE, confirm that planning and the realization to radio communications system is particularly advantageous.Here, head joint equipment is used for one or more PCM of each termination or ISDN-SO-communication line, wherein can imagine by switchgear SE and be undertaken manually or identification or regulate circuit types that each uses automatically.In this case, operator or radio net planning personnel according to demand selectively or by the PCM communication line or by the ISDN-SO-telecommunications line termination on the base station BS of respectively wanting termination, reaching the communication line that lead connects and the resource allocation by reasonable demand of radio carrier frequency, and can reduce systematic running cost simultaneously and use.In addition, the planning to network provides best flexibility.As switchgear SE, for example can use by older German patent application DE19808495.1 and the known integrated switching circuit BISON of DE19808498.6.

Claims

1. the base station of radio communications system (BS1), has at least one PCM communication line (PCM), it is characterized in that, make PCM communication line (PCM) connect a switchgear (SE) and be used to leach the signal that respectively is identified for this base station (BS1) (a) and another base station (BS2) that is used on the circuit that lead is connected, the signal that is not filtered off (for example b, c) of PCM communication line (PCM) being transferred to radio communications system from PCM communication line (PCM).

2. according to the described base station of claim 1 (BS1), on this station, be not filtered off signal (for example b) by another PCM communication line (PCM ^★) be transferred to other base station (BS2).

3. by the described base station of claim 1 (BS1), the signal that is not filtered off on this station (for example b) is transferred to other base station (BS2) by at least one ISDN-SO-communication line (ISDN-SO).

4. by the described base station of claim 3 (BS1), the signal that is not filtered off on this station (for example c) is by at least one additional ISDN-S0-communication line (ISDN-SO by the foundation of automatic telephone communication line ^★) be transferred to other base station (BS2).

5. by claim 3 or 4 described base stations (BS1), the signal that switchgear on this station (SE) is not filtered off PCM communication line (PCM) (for example b, c) converts ISDN-SO-communication line (ISDN-SO, ISDN-SO to ^★) signal (for example b) or carry out opposite transition.

6. by the described base station of one of aforesaid right requirement (BS1), this base station terminates on the base station controller (BSC) of radio communications system by PCM communication line (PCM).