Method for network identification acquisition by regular users for supporting automated planning and optimization processes in cellular mobile radio networks

[0001] The present invention relates to a method of recording real / current parameters of a cellular system, for example according to the GSM, UMTS standard,

E-UTRAN / LTE or WiMAX, by the cellular terminal of the real user of this cellular system, the parameters being recorded by means of typical cellular terminals by the users of this cellular system, without additional external position determination devices, in the memory contained in the cellular terminals and are transferred to a central or decentralized / distributed recording, analyzing and processing unit.

[0002] A method of this type is known from the British patent application GB

360 173 A. Another state of the art is checking the relevant cellular network parameters through dedicated measurement rides that require costly personnel and material. In addition, these methods have the disadvantage that only discrete areas of the cellular system can be recorded by such methods, e.g., measurements of the quality of the cellular system supply along roads and highways. Another disadvantage is that these measuring trips cannot be carried out continuously and covering the surface and hence the measurement results for the current situation or as covering surface may not always be available.

[0003] An optimized variation of the method of dedicated measuring journeys for recording network parameters has been described in DE 199 00 543 / EP 1 021 055

A2: In the method described therein, special users of the cellular system are used to record relevant parameters of the cellular network and these recorded measured values ​​are transferred to the cellular network analyzing unit using signaling channels (SMS) when a predetermined event occurs. To register the position, an external device ("memory and processing module") is required to determine the current position of the cell terminal inside the network topology (in addition, possibly an external GPS receiver and possibly a personal computer). The use of one or

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- a larger number of external additional devices ("memory and processing module" & GPS receiver) constitute for a normal cellular telephony user an investment not adapted to the possibility, thus the possibility of using this method remains limited to specifically equipped users (for example buses, taxis, trucks, etc., but not "normal" mobile phone users).

[0004] The state of the art is therefore recording systems for the parameters of a cellular system that record user-defined data by the user terminal (MS: Mobilstation, UE: User Equipment), transfer them to an external memory and processing unit and with the help of additional equipment (e.g. external GPS receiver) they provide location (position) and via user data channels (GPRS) or signaling channels via SMS (e.g. via the SDCCH channel in the case of GSM) they forward to the cellular network for further processing / analysis, cf. DE 199 00 543 / EP 1 021 055 A2.

[0005] Alternatively, there are also known methods which accepted data are temporarily stored in a data recording unit, which must be specially selected to prepare this data; this approach is typical for dedicated measurement drives in cellular networks. This procedure is known, for example, from EP 0 946 007 A2. The document describes a method and system for measuring the quality of transmission in cells of cellular networks using mobile stations that are equipped with a GPS receiver and which have a recording unit. To carry out the measurement inside the cell, a vehicle is needed in which the mobile station is located, for example a cell terminal. In the case of a vehicle we are dealing with a test vehicle or a bus or taxi. The mobile station can be transported in their trunk. You drive a vehicle through the cell to be measured and the geographical position and time are recorded at certain times. The recording entity is not used for other data. Recording can take place on a diskette, the recording unit having a diskette drive, respectively. This way to measure the quality of transmission in network cells

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Cellular use is a nuisance and only provides very little information about the cellular system because the acquisition of measurement data is only carried out by specially equipped vehicles.

[0006] The object of the invention is to provide a method for recording real / current parameters of a cellular system that overcomes the above-mentioned disadvantages and allows a reliable and cheap way to record with the surface coverage of the cellular system parameters, whereby the input on the device side and the required participation of people is to be significantly reduced.

[0007] According to the invention, this object is achieved by a method with the features of claim 1.

[0008] Preferred embodiments and developments of the invention result from the dependent claims.

[0009] According to the invention, the recording of parameters of a cellular system, in particular of a cellular network, occurs by the fact that the parameters are recorded in the memory contained in cellular terminals by means of typical cellular terminals by users of this system without additional external positioning devices and transmitted to a central or decentralized / distributed recording, analyzing and processing unit in the cellular system, wherein the parameter recording (306, 308) occurs when the communication connection is interrupted.

[0010] According to the invention, it is provided that the relevant parameters of the cellular network are recorded in the current position of the cellular participant of that cellular network directly by the user's cellular terminal under normal conditions of use, optionally may be provided with positioning, and that these measurement data are transmitted from the terminal cellular via standardized signaling channels of the cellular system, preferably according to the GSM, UMTS, E-UTRAN- / LTE standard or

WiMAX, to the cellular operator analyzing unit.

The subsequent further processing of the data thus transmitted can be advantageously used for planning and optimizing the structure of the radio network (neighborhood planning, setting further operating parameters, etc.) as well as

55P31818PL00. Also for providing demand-oriented specific information content to the mobile user (client). In the context of minimizing operating costs, this is also motivated by supporting procedures that support certain processes in a cellular network and its parameters as a self-optimization (Goal: Self-Optimizing Network, SON).

[0012] The measured values ​​and methods presented in this document form the basis for self-optimization procedures, however they are not limited to the measured values, procedures and scenarios presented. One embodiment of the method of the invention also provides for automatic recording and sharing of recorded measurement data, without the need for the user of the mobile terminal by itself.

[0013] The advantage of the present invention over the prior art is the abandonment of additional external devices in the form of measuring and position recording equipment and software, and the possibility of being used without additional effort on the user's side, and without its support.

[0014] Typical cell terminals, preferably GSM, UMTS, E-UTRAN- / LTE or WiMAX terminals are used to apply the method described herein. Further advantages of the method according to the invention are the possibility of defining the measurement areas in advance and without allowing manual intervention or the use of additional devices to allow analysis by a measuring technique of a specific area by normal cellular participants. An important advantage of one embodiment of the method according to the invention is the possibility of measuring at the entrance to a predefined recording area.

[0015] It is particularly advantageous in the method for recording cellular system parameters, especially cellular network, that the cellular system parameters, especially cellular network, are recorded using cellular terminals and transferred to a central or decentralized / distributed recording, analyzing and processing unit in network.

[0016] The cellular system or cellular network may be, in particular, a network according to the GSM, UMTS, E-UTRAN / LTE standard or

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WiMAX, however, the application of the method is not limited to the listed network standards. The concept of parameters can, in particular, pull up performance data, coverage, signal strength, network load, availability in the current position, power quality and the like. Therefore, the recording and forwarding of parameters or data of a cellular system or cellular network takes place using typical cellular terminals of the participants of this network, without additional external position determination devices, in particular external GPS receivers or a memory and processing module.

[0017] The term GPS receiver is hereinafter understood as synonymous with any type of positioning device using satellites or satellite navigation systems, without being limited to the Global Positioning System

GPS. It can be any positioning method supported by satellite.

[0018] The data is transferred to the recording, analyzing and processing unit preferably via the signaling channels of the system.

[0019] In a preferred embodiment, the method and the procedures necessary for it may be part of a GSM, UMTS, E-UTRAN / LTE system or

WiMAX and neither data recording nor combining measurements with the current position, nor forwarding to the recording, analyzing and processing unit does not occur at the application level, but the signal channels of the system can be used.

[0020] Preferably, the standardized parameters of the cellular system are combined with an indication of the position of the current recording location and transferred to a recording, analyzing and processing unit of the cellular system. For cellular systems according to the UMTS or E-UTRAN- / LTE standard, the parameters may be in particular CPICH Ec / No, CPICH

RSCP, CPICH RSRP, Pathloss, SIR, BLER, data throughput, "active set" information, transmit power and the like. Cellular systems according to the GSM / GERAN standard can be used for parameters, in particular for

RxLEV, RxQual, transmit power, Pathloss.

[0021] The given parameters can be combined with an indication of the position of the current recording location and can be forwarded to the recording unit,

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Analyzing and processing the cellular system.

[0022] In a preferred embodiment of the method according to the invention, a time stamp is added to the recorded parameters, in particular a time stamp may be added to the recording, analyzing and processing unit by the cell terminal or by the recording, analyzing and processing unit to the received parameters at the moment pickup time stamp can be added.

[0023] By adding a time stamp, further time-based analyzes are possible, such as the maximum network load times during the day compared to the minimum network load times at night, for example.

[0024] In a particularly preferred embodiment, the obtained measurement data is used not only to support the possibly occurring connection, but this data provided with the position specification and possibly the time stamp are forwarded for analysis or further processing to the recording, analyzing and processing unit of the cellular network.

[0025] Preferably, the transfer of currently registered parameters of the cellular system to the cellular system occurs always when the current residence position of the mobile terminal has been determined, in particular when using Location Based Services, i.e. services that are available depending on the position. Determining the position of the cellular terminal within the cellular network occurs more or less regularly, so that triggering recording and transfer of current parameters of the cellular network depending on the determination of the position of the cellular terminal enables optimal recording of data possibly covering the surface. For example, registration and transfer may occur when a participant in the cellular system asks for location-dependent services such as when using Location Based

Services, because when using such services the position of the cellular terminal is known and thus the assignment of recorded data to the position is easily possible.

[0026] Measurements of the current parameters of the cellular system are preferably analyzed and processed to determine and optimize the quality of network power

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- which have been registered and transferred to the system by cellular terminals, in particular by actual cellular participants.

[0027] In this way it is possible to optimize the network with much less effort relative to the method according to the state of the art, in particular surface covering data for analysis is available.

[0028] Preferably, the query for determining the position of the mobile terminal in the cellular system is provided with a time stamp and this position with the associated query time or as a result of the user initiated position query is saved and / or analyzed in the analyzing unit.

[0029] Preferably, the recording and sharing or connection of the current position with the parameter measurement data recorded here is carried out by means of a GPS receiver integrated in the cellular terminal.

[0030] The recording and sharing or connection of the current position with the measurement data recorded here can preferably be carried out whenever the terminal moves through an area predefined by the network operator.

[0031] By triggering the recording and forwarding of cellular network data in connection with a defined, i.e. spatifiable limited area of ​​the cellular network, including one or more cellular cells, it is possible to deliberately record data and spatial assignment, in particular in this way be checked and analyzed network availability and quality in specific areas.

[0032] In a particularly preferred embodiment, the recording and sharing or connection of the current position with the measurement data recorded here is always carried out when the position measurement took place in a predefined time or within a predefined time interval.

[0033] By this specific time intervals, for example maximum network load times per day, can be analyzed.

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[0034] Recording of network quality information by a regular cellular participant is preferably carried out and forwarded to a recording, analyzing and processing unit in the network whenever the user terminal has reached a predetermined area of ​​the cellular network.

[0035] By this it is possible to determine and analyze cellular network data in connection with a defined, i.e. identifiable, spatially limited area of ​​the cellular network comprising one or more cellular network cells. Thus, intentional data recording and spatial assignment is possible, in particular in this way the availability and quality of the network in specific areas can be checked and analyzed in a planned manner.

[0036] The preliminary definition of the recording area may be followed by the area designation used in cellular networks, in particular the Location Area (LA), i.e. the cell terminal's staying area, or Routing Area (RA) or UTRAN Registration Area (URA) or Tracking Area (TA) ) or a cell or some of the area designations mentioned above in combination.

[0037] Preferably, the preliminary definition of the recording area can be made by describing the area polygon, wherein the user terminal determines the current position by means of an integrated GPS receiver and at the entrance to the predefined area polygon automatically starts recording parameters and transmitting to the recording, analyzing and processing unit in the network cell.

[0038] Preferably, the recording and forwarding of recorded data is independent of the operating (active / idle) state of the user terminal. The certainty of using the method according to the invention can therefore be realized regardless of the switching state of the various cell terminals.

[0039] The transfer of recorded data preferably takes place on the signaling channel of a given cellular system and not via channels usually intended for user data (SMS, Traffic Channel). As a result, unlike the prior art methods, no communication channel is occupied or channel resources are not needed by sending an SMS.

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[0040] Recording of data or parameters of the cellular network is preferably based on standardized events, in particular on UMTS or EUTRAN Measurement reporting events, in particular the measurement process can be started when the threshold values ​​of the parameters are exceeded or upwards. , wherein the threshold values ​​are in particular predefined by the network with respect to the participant's device.

[0041] Alternatively or additionally, data logging may be based on standardized events, in particular UMTS or E-UTRAN Measurement reporting events, and after a defined event, measurements and parameter transfer may occur for a specified period of time at intervals. This makes it possible to implement periodic reporting.

[0042] In particular, for UMTS, the events described in 3GPP TS, 25.331, Chapter 14 can be used as triggers to perform the recording and transmission of network data.

[0043] According to the invention, data recording is based on defined exceptional situations, namely interruption of the communication connection. In particular, after an emergency, measurements and parameter transfer may occur for a specified period of time. This makes the periodic reporting possible. At the same time, possible gaps in the cellular network supply are identified when, for example, the interruption of the conversation serves as a parameterization call. At the same time, further information about the place, time, and the primary cell (cell identity) and possibly the target cell (cell identity) in the event of a failed handover can be forwarded to the unit recording, analyzing and processing the cell network.

[0044] Preferably, the transmitted parameters or data of the cellular network are anonymized. The required data protection in particular is met by anonymized data storage.

[0045] Preferably, a statistical analysis of the transmitted parameters or cellular network data takes place. Thus, registered network data can be used

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In particular for network optimization. Preferably, the cellular network parameters or data represent the quality of the power supply and / or network parameters, as well as where and when the connection is interrupted with further cellular network parameters. [0046] In a more preferred embodiment, the parameters or data are recorded and transmitted during determinable time windows.

[0047] Preferably, the positions of the gaps in the cellular network supply are stored at least temporarily in the cellular terminal and forwarded to the recording, analyzing and processing unit of the cellular network as soon as the connection to the cellular network occurs again. In this way, gaps in the power supply of the cellular network can be simply and advantageously identified and documented.

[0048] The object according to the invention is also achieved by a computer program according to claim 24 with a program code which - when executed on a cellular terminal - implements the method according to the invention and by a computer program according to claim 25 with a program code which - when executed on installation for data processing - carries out the method according to the invention, and via a system of cellular terminals for recording parameters of a cellular system according to claim 26.

[0049] The Figures show various embodiments of the method according to the invention and are explained below. The figures show in turn:

Figure 1 schematically shows cell network cells and the definition of the measurement area based on CI, LA, RA, TA etc.

Figure 2 schematically shows cellular network cells and the definition of the measurement area based on polygon graphic data.

Figure 3 schematically illustrates cell network cells and the definition of the measurement area through a circle with radius R.

Figure 4 shows, for example, the exchange of information between an entity

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- recording, analyzing and processing (EAV), base station system (BTS) and cellular terminal (UE).

[0050] Figure 1 schematically shows cellular network cells and the definition of a measurement area based on the identity of the CI cell, Location Area LA, i.e. the residence area of ​​cell terminal 1, Routing Area RA, Tracking Area TA etc.

[0051] Due to the special properties of the cell channel, special procedures are necessary to use this channel for data transmission. These procedures are described and adjusted by appropriate parameters. For the planning and operation of cellular systems, for example in accordance with the GSM, UMTS, E-UTRAN / LTE or WiMAX standards, it is necessary to know the current parameters (RxLEV, RxQual in the case of GSM, or CPICH RSCP, CPICH Ec / No, Pathloss, SIR, "active set "for UMTS or sub-frequencies used in OFDM systems (such as E-UTRAN- / LTE or WiMAX) in the entire area of ​​the cellular network 3.

[0052] With reference to Figure 1, a significant advantage of the method described here relative to the prior art is that to determine the measurement data and connect the current recording location, no external or additional device is required in addition to a typical, standardized cell terminal 1 with integrated position recording, e.g. integrated GPS receiver. In addition, the advantage of the described method is that the determination and transfer of parameters of the cellular network 3 can be combined with the determination of the position 100 of the mobile cellular terminal 1 and is transmitted via signaling channels (e.g. according to standard

GSM, UMTS, E-UTRAN- / LTE or WiMAX) for analysis; thus, unlike known methods, no communication channel is occupied or no channel resources are needed by sending an SMS as described in DE 199 00 543.

[0053] Another advantage of the method according to the invention is given by the already necessary start of measurements (both network parameters and position), which leads to significant savings of the battery cable: Mobile terminal 1 starts

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E.g. determining own position 100 automatically and independently to obtain location-related information and only transmits further information to cellular network 3 which gives the cellular network operator information about the state of his network 3 in the user's current position 100 . To determine your own position 100 mobile device and to share this information with

Location Based Service (LBS) usually requires connections between mobile station 1 and cell network 3 to transfer a specific position. As a rule, in connection with the creation of this connection, measurement data of the participant's terminal 1 is also recorded on network 3 request (e.g. due to RNC signaling in the network

UMTS) and forwarded to RNC via terminal 1 to hold the connection (e.g. CPICH RSCP or Ec / No measurements). To this end, they are in accordance with the method of the invention, but connected to the current position 100 of the registration site and are forwarded to both RNC (here in the case of UMTS), to eNB (in the case of E-UTRAN / LTE) to maintain the connection and to an appropriate recording, analyzing and processing unit 2 for recording the network parameters in the cellular network 3.

[0054] The position 100 of the currently performed network quality measurement is determined, for example, by the use of an integrated GPS receiver in mobile terminal 1 or by other known methods (based on "Cell Identity", OTDOA, ETDOA, etc. [3GPP TS 25.305]), which however, due to their nature, they condition a less accurate determination of the current position of the mobile end customer.

[0055] Alternatively, the position 100 and the corresponding parameters of the cellular network 3 according to the method according to the invention are preferably determined whenever the position 100 of the mobile terminal 1 is carried out at the request of the user or a specific application.

[0056] Specific parameters of the cellular network 3 are transferred for subsequent storage and further processing without user identification features (e.g. IMSI, P-TMSI) to the recording, analyzing and processing unit 2 provided by the network operator. Parameters flowing here from many participants can be statistically analyzed and through a lot of information

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- used to optimize the cellular network 3.

[0057] As a side effect of this method, the available anonymized data can be used to test in which spatial positions of the cellular network at which times the appropriate queries to determine the position of the mobile terminal are carried out. From this, location-related information services can be made advantageous.

[0058] The development of the method according to the invention (Figure 1) allows the network operator to get inside a specific area 4 (e.g. based on Location Areas (LA),

Routing Areas (RA) or Cell ID on cellular systems according to UMTS and GSM standards, or based on UTRAN Registration Area (URA) (on UMTS cellular systems), or Tracking Areas (TA) on E-UTRAN / LTE systems, configure cellular terminals with built-in GPS 1 receivers, so that after entering the pre-defined area 4 (Cell ID, LA, RA, URA, TA) they carry out predefined measurements of the network quality and forward to the recording, analyzing and processing unit of the network 2. In the example shown in Figure 1, the predefined area 4 comprises a plurality of cells of the cellular network 3.

[0059] With reference to Figure 2 in another embodiment of the method of the invention, as areas, for example, a definition of polygons 5 within a cellular network 3 is proposed, wherein the pre-configured participant terminal 1 at the entrance to this area 5 makes predefined measurements and transmits them to the unit recording, analyzing and machining 2. For example, based on positional corner points 6 (according to Gauss-Kriiger mapping or other GIS system) area 5 could be defined in which accurate measurement data is of interest to the cellular network operator.

[0060] According to Figure 3, the shape of the predefined area 5 may be, for example, a circle 7 with a radius R around the defined position 101.

[0061] In the alternatives not shown, the area is defined by a rectangle or a freely defined sequence of polygons. The decisive advantage in this form lies in the reduced requirement for the number of measurements, since a precisely defined area of ​​4, 5 or 7 can be registered.

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[0062] As an additional feature for all the above-described embodiments, the time component can still be used: the initial configuration of the measurements therefore also includes a time component, where the measurements to be determined are carried out and transferred to a recording and analyzing unit and processing 2 networks 3 only during a predefined time interval (e.g. only between 16:00 and 20:00; or based on a combination of place and time). The option of pre-recording time configuration allows the network operator to specify real measurement data by users at specific time intervals (e.g. only during the so-called "busy hour" or only at certain night hours, e.g. when the network upgrade and own measurements are too expensive. Further conditions for the measurement are possible, such as measurement when the threshold values ​​of the parameters are exceeded up or down, which can be defined by the network in relation to the participant.

[0063] In addition, it is also possible to locally save the recorded measurement data with position 100 and the recording time in the client terminal 1, with the local recording enabling the data to be transferred during low traffic (e.g. at night). The preconfiguration of a defined recording area 4, 5 or 7 allows the operator to register specific areas of network 3 by the participants of the network 1, whom he is particularly interested in and which may change dynamically.

[0064] All embodiments of the proposed method allow recording of cellular system parameters regardless of whether communication between the user terminal 1 and the network 3 is currently present (e.g. during conversation / data transmission - "active mode") or whether the participant terminal 1 finds only in ready reception ("idle mode"). Even when a connection between the participant's terminal 1 and network 3 is not possible, such as in a poorly stocked area, measurement values ​​such as information about neighboring networks or networks with other access technologies can be stored in the user's terminal 1 and when a new connection occurs to networks 3 can be shared networks.

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[0065] Figure 4 illustrates an example communication flow for configuring, determining and reporting desired measurements. The recording, analyzing and processing unit "EAV" 200 of cellular network 3 decides in step 300 about the necessary recording of cellular system data. For this purpose, a decision regarding the measuring object ("object", eg CPICH Ec / No), measuring area ("area") and possibly measuring time limit ("time") is necessary. The recording, analyzing and processing unit 200 determines the appropriate BTS / NB / eNB 201 based on the geographical cell network topologies that occur. For example, when measurements are required in a specific Location Area (LA) of a cellular network, all BTS / NB / eNB 201 that belong to this LA receive a command by 301 message to request measurements from cell terminals in the area of ​​the given BTS / NB / eNB 201. This may include all or only part of the cell terminals in the area, as decided in step 302 by BTS / NB / eNB 201. To selected cell terminals (UE) 202 BTS / NB / eNB 201 sends the appropriate configuration message 303 with relevant data regarding the "event" - for example, when a certain measured value ("object") exceeded the set value up or down - the number of sending reports "number", area ("area") in which the measurement order is valid and, if necessary, a time limit, when the measurements are to be made ("time"). Upon receipt of the configuration message 303 UE 202 checks in step 304 the appropriate current situation of the measurement order specified in the configuration. When the appropriate event occurs at step 305, the UE performs the appropriate measurements, combines them with the measurement position and, if necessary, time, and sends them in MEASUREMENT REPORT 306 to the specified BTS / NB / eNB 201. In step 307 BTS / NB / eNB 201, it deletes the specific for the participant in the label (e.g. B.TMSI) submitting the UE 202 report and sends a measurement report message SON 308 REPORT (SON: "Self-Optimizing Network") to the recording, analyzing and processing unit 200. Alternatively, BTS / NB / eNB may collect a number of MEASUREMENT REPORTS at step 307 and can send them together in step 308 to the recording, analyzing and processing unit 200. Thus, certain data, i.e. parameters 306

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Or the data, i.e. parameters 308, contained together in the eNB 201 base station are transferred to the recording, analyzing and processing unit 200.

[0066] Incoming SON 308 of a given BTS / NB / eNB 201 base station different UE 202 are then further processed in a recording, analyzing and processing unit 200 and processed and further processed for the planning and optimization process of the cellular network operator.

List of reference symbols and abbreviations [0067] cell terminal recording, analyzing and processing unit (EAV) cell network area polygon (area) positional corner point area (circle)

100 position of the mobile terminal 1

200 EAV (recording, analyzing and processing unit)

201 BTS / NB / eNB (base station)

202 UE (User Equipment, mobile terminal)

300-308 method steps

300 calling measurement

301 call message

302 selection of cellular terminals in a selected area

303 configuration message to the mobile terminal

304 configuration message analysis by cellular terminal

305 registering network parameters by a mobile terminal

306 Cellular network parameters (single measurement report)

307 compilation of many measurement reports

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308 Cellular network parameters (overview measurement report)

BTS Base-Transceiver Station (base station)

CI Cell Identifier

CPICH Common Pilot Channel (UMTS) eNB Enhanced Node B (base station)

E-UTRAN Enhanced Universal Terrestrial Radio Access Network

GPRS General Packet Radio System

GPS Global Positioning System (satellite supported positioning system)

GSM Global System for Mobile Communications

IMSI International Mobile Subscriber Identity

LA Location Area (the area where the mobile terminal resides)

LBS Location Based Services

LTE Long Term Evolution

NB Node-B

OFDM Orthogonal Frequency Division Multiplex

OTDOA Observed Time Difference of Arrival

P-TMSI Packet Temporary Mobile Subscriber Identity

RA Routing Area

RNC Radio Network Controller

RSCP Received Signal Code Power

RSRP Received Signal Reference Power

RxLEV Reception Level

Rxqual Reception Quality (reception quality)

SDCCH Standalone Dedicated Control Channel

SIR Signal to Interference Ratio

SMS Short Message Service

SON Self Optimizing Network

TA Tracking Area

UE User Equipment (User terminal = mobile terminal)

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UMTS Universal Mobile Telecommunication System

URA UTRAN Registration Area

WiMAX Worldwide Interoperability for Microwave Access

Deutsche Telekom AG

Proxy:

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