EP0979587A2 - Procede et station de base de rattachement permettant l'etablissement d'une liaison pour une station mobile - Google Patents

Procede et station de base de rattachement permettant l'etablissement d'une liaison pour une station mobile

Info

Publication number
EP0979587A2
EP0979587A2 EP98931979A EP98931979A EP0979587A2 EP 0979587 A2 EP0979587 A2 EP 0979587A2 EP 98931979 A EP98931979 A EP 98931979A EP 98931979 A EP98931979 A EP 98931979A EP 0979587 A2 EP0979587 A2 EP 0979587A2
Authority
EP
European Patent Office
Prior art keywords
base station
home base
hbts
mobile
station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98931979A
Other languages
German (de)
English (en)
Inventor
Jochen Helms
Franz Schreib
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0979587A2 publication Critical patent/EP0979587A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

Definitions

  • the invention relates to a method and a home base station for establishing a connection for a mobile station of a mobile radio network, wherein the connection establishment can be initiated by the home base station or by the mobile station.
  • Radio communication systems are formed, for example, by mobile radio systems, wireless telephony systems or by radio stations for wireless subscriber connection (RITL radio in the local loop).
  • Mobile radio networks enable the establishment of communication connections to mobile subscribers, wireless telephony systems connect special mobile devices in the home area, while radio stations for wireless subscriber connections establish communication connections to stationary subscribers.
  • a network radio station is called a base station.
  • Time division multiplex The time division multiplex method is also called TDMA (Time Division Multiple Access) method. If subscriber signals of different connections are transmitted simultaneously, but in different frequency bands, then a frequency division multiplex system (FDMA - Frequency Division Multiple Access) is available.
  • TDMA Time Division Multiple Access
  • a well-known mobile radio network is, for example, the GSM (Global System for Mobile Communication) mobile radio network.
  • GSM Global System for Mobile Communication
  • other methods for separating the Participants are applied.
  • specific codes can also be used for each communication connection.
  • a base station is a remote unit, which is usually wired to other network components on the network side, and which is connected to the terminal or another radio station via the radio interface.
  • WO 95/02927 a method is known in which not only the subscriber number, telephone number and authentication code, but also settings of transceiver devices of a mobile station and a home base station are stored by means of SIM cards (Subscriber Identification Module).
  • SIM cards Subscriber Identification Module
  • the home base station is connected to a wired communication network.
  • Dual-mode end devices which are used to establish a connection to home base stations via a wireless connection according to DECT (Digital Enhanced Cordless Telephony) and in addition to establish a connection to base stations of the mobile radio network according to GSM standard are formed.
  • DECT Digital Enhanced Cordless Telephony
  • GSM Global System for Mobile Communications
  • the invention is based on the object of specifying a method for establishing a connection and a home base station, by means of which a flexible and secure connection setup between the mobile station and home base station is made possible with little economic outlay. This task is accomplished by the
  • the establishment of the connection can be initiated by the mobile station of a mobile radio network or the home base station.
  • mobile station-specific identifiers are introduced, which determine an assignment of a mobile station to a specific home base station.
  • the transmission from the mobile station to the home base station is referred to hereinafter as the upward direction and from the home base station to the mobile station as the downward direction.
  • the home base station is provided for supplying small cells in addition to radio cells supplied by base stations of the mobile radio network.
  • the mobile station when the connection is initiated by the mobile station, the mobile station is synchronized based on an evaluation of an organizational channel of the mobile radio network.
  • the mobile station In a frequency band of the home base station, the mobile station sends a message containing a mobile station-specific first identifier to it, which is received and evaluated by the home base station. If the first identifier matches a second identifier registered for the home base station, the connection is established.
  • the synchronization of the mobile station and the identification query initiate the connection establishment with little effort and sufficient accuracy.
  • the home base station can use the methods known from the mobile radio network to evaluate requests for establishing a connection.
  • the mobile station advantageously provides for switching between a first operating mode relating to the home base station and a second operating mode relating to the other base stations of the mobile radio network. Since the fee structure of the mobile radio network and the other network - for example a fixed network - to which the home base station is connected can differ, it is thus possible for the subscriber to decide on a specific network. Switching can be done manually using the keyboard functions of the mobile station or according to a stored priority list if the highest priority variant is not available.
  • a connection When a connection is set up initiated by the home base station, a free channel in a frequency band assigned to it is selected by the home base station, whereupon the home base station sends a message containing a mobile station-specific second identifier. This message is received and evaluated by the mobile station. If the second identifier matches a first identifier assigned to the mobile station, the connection is established.
  • the home base station can convert a number or a call sign within the network into the mobile station-specific second identifier for the subscriber. With little change effort, the MobilStation can also be called outside the mobile network and a connection can be set up with possibly lower fees.
  • the home base station is synchronized on the basis of the evaluation of an organizational channel of the mobile radio network.
  • This organization channel contains at least information on one of the following variables for tuning internal oscillators or control devices: time, frequency or subscriber code (in the case of CDMA).
  • the existing infrastructure of the mobile radio network can thus be used to coordinate the home base station. Methods of tuning the mobile stations can be adopted by the home base station.
  • a subscriber-related plug-in card which usually contains subscriber-related data in the mobile station, is used by briefly inserting it into a reading device of the home base station to charge the home base station with the second identifier, or is used via a signaling dialog between Mobile station and home base station set the first identifier of the mobile station and stored in it.
  • SIM card subscriber-related plug-in card
  • both devices can be offered as a set.
  • provision can also be made to reset the first identifier by inputs via the keyboard or by network-side signaling.
  • the validity of the entry of the identifiers is provided with an expiry date, so that after a predefinable time or in the event of a power failure, the Assignment is canceled. This period of validity can be offered by the home base station on the basis of various authorization criteria for different user groups (residents of an apartment - long -, business partners on a visit - short - or the like).
  • a home base station can also hold a number of second identifiers, the called mobile station being selected in the case of an incoming call on the network on the basis of one or more selection digits.
  • a home base station according to the invention can advantageously be developed in such a way that the transmission power of the mobile station is controlled with a device for setting the transmission power via the radio interface. Due to the transmission power control, which can be adapted to the individual reception conditions, lower transmission powers are set in the mobile station for the small cell compared to the mobile radio network and the interference for further communication connections is reduced.
  • an additional control channel for the mobile station of the small cell is provided by a transmitting / receiving device of the home base station.
  • This additional control channel allows transmission parameters to be additionally set in accordance with the transmission conditions on the radio interface between the mobile station and home base station.
  • 1 shows a schematic illustration of a mobile radio network and a further communication network
  • 2 shows the cell division of a mobile radio network with additional small cells from home base stations
  • FIG. 3 is a block diagram of a home base station
  • FIG. 4 shows a flowchart of a connection establishment starting from a mobile station
  • FIG. 5 shows a flowchart of a connection establishment starting from a home base station.
  • the mobile radio network according to FIG. 1 is, for example, a mobile radio network according to the GSM standard, see also J. Biala, "Mobile Radio and Intelligent Networks” Vieweg Verlag Wiesbaden / Braunschweig, 1995, and consists of at least one mobile switching center MSC, which is connected to further mobile switching centers MSC is networked or establishes the gateway to a fixed network PSTN.
  • GSM Global System for Mobile Communications
  • the mobile switching center MSC shown is connected to at least one base station controller BSC.
  • BSC base station controller
  • at least two base stations BTS and one home base station HBTS are connected to the base station controller.
  • Another HBTS home base station is over one
  • Interface unit IU connected to the mobile switching center MSC.
  • the mobile radio network also includes an operation and maintenance center OMC, which is connected to a mobile switching center MSC and is provided for monitoring the performance parameters of the mobile radio network and for maintenance and error control. It can also be provided that, for example, a base station system, independent operation and maintenance centers are provided for subcomponents of the mobile radio network.
  • OMC operation and maintenance center
  • 1 also shows a fixed network PSTN with switching devices VE networked with one another. Communication terminals KE and home base stations HBTS are connected to these switching devices VE via a subscriber line. The subscriber line is wired to the home base station HBTS, during which the connections between the subscriber line and the switching device VE are wired via an interface device IU, via optical fibers or wirelessly in the sense of RITL.
  • Communication connections are switched in the switching devices VE with space / time coupling devices.
  • Interfaces between the communication terminals KE or home base stations HBTS and the switching device VE are designed according to the ISDN (integrated services digital network) standard (SO interface) or analog (TAE).
  • ISDN integrated services digital network
  • TEE analog
  • a home base station HBTS supplies a small cell that has a significantly smaller expansion than a cell of base stations BTS.
  • the small cell is located inside a cell, whereby the radio coverage is on an apartment, a house or the like. limited.
  • a radio area is an area that can be served by one or more base stations BTS or home base stations HBTS and is consequently located within cells. In the case of coverage by several base stations BTS or home base stations HBTS, a radio area denotes the overlap area of cells and small cells.
  • FIG. 2 describes a geographical area in which cells ZI to Z3, Z7 with different radii are available within a mobile radio network. Furthermore, three small cells Z4 to Z6 are shown, which are supplied by HBTS home base stations.
  • the home base stations HBTS are either connected to interface devices IU of switching devices VE or to base station controllers BSC.
  • a mobile station MS is assigned to one or more home base stations HBTS in that a second identifier K2, which designates this mobile station MS, is available for these home base stations HBTS.
  • This second identifier K2 can be stored permanently in the home base stations HBTS or can be called up by other network components BSC, MSC, VE, OMC.
  • the radio interfaces are a GSM radio interface in the 900 MHz frequency band, a DCS radio interface in the 1800 MHz frequency band or a PCS radio interface in the 1900 MHz frequency band.
  • the radio interfaces between the home base stations HBTS and the mobile stations MS use the same frequency band.
  • a regional band e.g. a part of the E-GSM band, a time slot or a code set can be reserved for a CDMA transmission. Frequency planning is not required for this radio interface.
  • FIG. 3 The construction of a home base station HBTS is shown with reference to FIG. 3.
  • An antenna unit A is connected to a transceiver TRX via an antenna coupling unit K.
  • the transmission / reception device TRX prepares the transmission via the radio interface for a carrier, ie a frequency band.
  • a device for signal processing DSP connected to the transmitting / receiving device TRX which is designed as a digital signal processor, digital filtering, equalization, formatting of radio blocks, equalization and / or transmission are carried out for the receive signals rx and the transmit signals tx. Nesting of radio blocks, decryption or encryption, and other channel-oriented control functions performed.
  • the interface between the device for signal processing DSP and the wired ISDN network is implemented via a device for data rate conversion ED.
  • a data rate of the mobile radio network for example 13 Kbit / s of the speech encoder / decoder, is converted into a data rate of the wired connection, for example 64 Kbit / s PCM; if necessary, it is converted to an analog connection.
  • a B channel is evaluated or operated, i.e. the establishment of the connection, the maintenance of the connection and the disconnection are controlled.
  • the home base station HBTS contains a device SE for synchronizing the radio transmission and a device PC for setting the transmission power. These are implemented on a software-related basis in a digital signal processor and also control functions of the transmit / receive device TRX. Since the distance between the mobile station MS and the home base station HBTS is generally smaller than that to a base station BTS of the mobile radio network, the transmission powers of the mobile station MS and home base station HBTS can also be smaller, with a communication link between them. This is signaled to the mobile station MS by the home base station HBTS. This also has the advantage that the Energy consumption of the mobile station MS in a communication relationship via a home base station HBTS can be reduced.
  • the power setting for the up and down direction can be done independently.
  • the calculation and signaling of the values for the transmission power setting is carried out in accordance with J. Biala, “Mobile Communications and Intelligent Networks” Vieweg Verlag Wiesbaden / Braunschweig, 1995, p. 106.
  • J. Biala Mobile Communications and Intelligent Networks
  • the device SE for synchronization brings about the synchronization of the radio transmission of the home base station HBTS.
  • the signals rx of an organization channel KK of the mobile radio network received by the transmitting / receiving device are evaluated.
  • the synchronization is carried out in such a way that the frequency of the transmitted or received carrier is corrected and time deviations of the radio transmission of the home base station HBTS with respect to the transmission of the mobile radio network are corrected.
  • Details of synchronization e.g. on a frequency correction channel (FCCH frequency correction channel) and a synchronization channel (SCH synchronization channel) of the GSM mobile radio network can be found in J. Biala, "Mobile radio and intelligent networks" Vieweg Verlag Wiesbaden / Braunschweig, 1995, pp. 270-271 become.
  • a mobile station MS also carries out the transmission power setting and the synchronization.
  • the transmission power setting and the synchronization In addition to the well-known
  • Devices of a mobile station for example the mobile radio terminal S6 from Siemens AG, are provided for switching UM between a first operating mode pr1 relating to the home base station HBTS and a second operating mode pr2 relating to the other base stations BTS of the mobile radio network.
  • the currently preferred operating mode prl or pr2 which depends on the preferences of the subscriber or the current
  • the home base station HBTS searches in the band UL in the upward direction for the second identifier K2 and receives the message with the first identifier Kl.
  • the first and second identifiers are compared with one another and, if they match, the connection is established.
  • the home base station HBTS transmits in the downward direction and receives in the upward direction, correspondingly, the mobile station MS transmits in the upward direction and receives in the downward direction.
  • a continuous synchronization to the organization channel KK of the mobile radio network KN also takes place during the connection. If synchronization to the organizational channel KK of the mobile radio network KN is not possible or too imprecise, an additional control channel of the home base station HBTS is set up, which is used by the mobile station MS.
  • connection establishment If the connection establishment is unsuccessful, the transmission of the first identifier K 1 is repeated after a randomly determined period of time. If this remains unsuccessful over a longer period of time, the connection is terminated.
  • Fig. 5 shows a connection establishment initiated by the home base station HBTS.
  • the home base station HBTS receives a third identifier K3 (eg the ring tone) from the communication network to which it is connected, which triggers the establishment of the connection.
  • a conversion of the third identifier K3 into a second identifier K2 takes place in the home base station HBTS by means of signal processing means.
  • the second identifier K2 which is obtained from the third identifier K3 (several end devices) or is permanently stored, designates the called mobile station MS for a home base station and for the home base station HBTS as a subscriber line. is marked.
  • the home base station HBTS and the mobile station MS are in turn synchronized by evaluating the organizational channel KK of the mobile radio network KN.
  • the home base station HBTS searches for a free channel in the band UL in the upward direction. If a free channel is available, the home base station HBTS sends a message with the second identifier K2 in the corresponding channel in the band DL in the downward direction.
  • the mobile station MS searches in the band DL in the downward direction for the first identifier K 1 and receives the message with the second identifier K 2.
  • the first and second identifiers are compared with one another and, if they match, the connection is established as already described.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'invention, lors de l'établissement d'une liaison par une station mobile, une synchronisation de la station mobile est réalisée sur la base d'une évaluation d'un canal d'organisation d'un réseau radiotéléphonique mobile. La station mobile renvoie à un estation de base de rattachement, dans une bande de fréquence de cette station de base de rattachement, un message contenant un premier indicatif spécifique de la station mobile, message qui est reçu et évalué par la station de base de rattachement. Si le premier indicatif correspond à un second indicatif enregistré pour la station de base de rattachement, une liaison est établie entre la station mobile et la station de base de rattachement.
EP98931979A 1997-04-30 1998-04-22 Procede et station de base de rattachement permettant l'etablissement d'une liaison pour une station mobile Withdrawn EP0979587A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19718475 1997-04-30
DE19718475 1997-04-30
PCT/DE1998/001129 WO1998049854A2 (fr) 1997-04-30 1998-04-22 Procede et station de base de rattachement permettant l'etablissement d'une liaison pour une station mobile

Publications (1)

Publication Number Publication Date
EP0979587A2 true EP0979587A2 (fr) 2000-02-16

Family

ID=7828350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98931979A Withdrawn EP0979587A2 (fr) 1997-04-30 1998-04-22 Procede et station de base de rattachement permettant l'etablissement d'une liaison pour une station mobile

Country Status (6)

Country Link
US (1) US6314299B1 (fr)
EP (1) EP0979587A2 (fr)
JP (1) JP2001522551A (fr)
KR (1) KR20010020396A (fr)
CN (1) CN1110984C (fr)
WO (1) WO1998049854A2 (fr)

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Also Published As

Publication number Publication date
CN1110984C (zh) 2003-06-04
US6314299B1 (en) 2001-11-06
CN1254489A (zh) 2000-05-24
WO1998049854A3 (fr) 1999-01-28
WO1998049854A2 (fr) 1998-11-05
KR20010020396A (ko) 2001-03-15
JP2001522551A (ja) 2001-11-13

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