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WO1997034378A2 - Procede de connexion d'une station mobile a un reseau amrt - Google Patents

Procede de connexion d'une station mobile a un reseau amrt Download PDF

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Publication number
WO1997034378A2
WO1997034378A2 PCT/FI1997/000166 FI9700166W WO9734378A2 WO 1997034378 A2 WO1997034378 A2 WO 1997034378A2 FI 9700166 W FI9700166 W FI 9700166W WO 9734378 A2 WO9734378 A2 WO 9734378A2
Authority
WO
WIPO (PCT)
Prior art keywords
dect
transmission
tdma
frames
time slots
Prior art date
Application number
PCT/FI1997/000166
Other languages
English (en)
Other versions
WO1997034378A3 (fr
Inventor
Kai Nyman
Original Assignee
Nokia Telecommunications Oy
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 Nokia Telecommunications Oy filed Critical Nokia Telecommunications Oy
Priority to AU19283/97A priority Critical patent/AU1928397A/en
Priority to EP97907120A priority patent/EP0878066A2/fr
Publication of WO1997034378A2 publication Critical patent/WO1997034378A2/fr
Publication of WO1997034378A3 publication Critical patent/WO1997034378A3/fr

Links

Classifications

    • 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
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst

Definitions

  • the present invention relates to a method for connecting a portable terminal to a TDMA-based network as described in the preamble of appended claim 1.
  • a portable terminal refers here to a telecommunication terminal used for mobile communication that can be used while moving about or in a location that is not known beforehand.
  • the method of the invention is to be used especially in a DECT system for connecting a portable DECT terminal to the DECT system, but it can also be applied in any other TDMA-based system.
  • a disadvantage of a conventional fixed telephone network is that when a subscriber station (e.g. a telephone) is moved to another location, a telephone number has to be specified for the new location at the telephone exchange. Such changes cause a lot of work to the operator and mean (additional) costs to the subscriber.
  • a subscriber station e.g. a telephone
  • Previously known mobile and cellular networks do not have the above mentioned disadvantage, but in them the telephone number is the same regardless of where the telephone is physically located.
  • the telephones of these systems also have subscriber-specific cards (e.g. SIM cards), so that a telephone can be used as a subscriber station of a desired subscriber.
  • SIM cards subscriber-specific cards
  • the telecommunication terminals e.g. telephones
  • the telecommunication terminals of a fixed net ⁇ work have at least the following advantages over the telecommunication terr minals of cellular networks:
  • the functioning of the telecommunication terminals is reliable - the telecommunication terminals receive power from the network and in this respect they are more reliable and user friendly,
  • the information concerning the subscriber line e.g. the operator and subscriber to be charged
  • - speech quality is always very uniform
  • the object of the present invention is to provide a method by which the advantages described above can be combined in the same subscriber sta ⁇ tion as simply and effectively as possible.
  • This object is achieved by the method of the invention, which is characterized by what is disclosed in the characterizing part of appended claim 1.
  • the basic idea of the invention is to branch a fixed point-to-point type connection where digital full duplex data transmission is used, the con ⁇ nection being parallel to the radio path in the portable terminal, and to imple ⁇ ment the branching in an interface where the data packets (bursts) appear es- sentially in the form wherein they are transmitted to the handling process re ⁇ quired by the radio path (in other words prior to possible channel coding and/ or interleaving or other similar measures required by the radio path).
  • a subscriber station can be transferred from one fixed subscriber connection to another fixed subscriber connection without the operator having to make any changes
  • the same telephone number can be used regardless of whether a connection to the network is established via the radio path or a fixed connec ⁇ tion, and - radio spectrum can be saved, since the subscribers can be con ⁇ nected to the network also via a fixed interface.
  • Figure 2 illustrates a DECT system of the invention
  • Figure 3 illustrates a frame structure used on the radio path in the DECT system
  • Figure 4 illustrates a frame structure according to the system of Figure 2 where a two-wire line is used
  • Figure 5 illustrates those parts of a portable DECT terminal which are essential to the invention.
  • Figure 6 illustrates the implementation of a wireline connection of the invention.
  • a reference model of the DECT system is described.
  • corresponding (English) terms have been used (for clarity) that are used in international standards (see e.g. ETSI, ETR 015, March 1991 : Radio Equipment and Systems, Digital European Cordless Telecommunications (DECT), Reference Document).
  • the DECT system can be connected to two types of network: - a local network LN, like, for instance, a subscriber exchange, and
  • GN a global network GN that is typically a national or an international network, e.g. a public telephone network.
  • the net ⁇ work components are divided into two kinds, portable terminals PT and fixed systems FS.
  • a fixed system is a combination of all the components that repre ⁇ sent the fixed components of the DECT network. These network components (PT and FS) are interconnected via the radio path.
  • the fixed system FS can contain many base stations (Radio Fixed Part), but only one common control fixed part CCFP.
  • an end system ES is connected, which system comprises the application processes (telecommunication services) used.
  • the DECT system comprises three parts:
  • a public telephone network e.g. a public telephone network, an ISDN network or a GSM network.
  • the DECT system is defined in the standard ETS 300 175 of ETSI, from which an interested reader can get a more detailed picture of the system.
  • FIG. 2 illustrates how the principle of the invention changes the reference model presented in Figure 1.
  • an ⁇ other, wireline transmission path WL is arranged parallel to the radio path RP between the portable terminal and the fixed system by employing a (copper) two-wire line, in other words by employing a similar transmission medium as in an ordinary telephone connected to a fixed telephone network. Consequently the portable DECT terminal can be connected to the fixed system either via the radio path or the wireline (subscriber loop).
  • the portable terminal PT is provided with a part W1 for wireless access, which is implemented in the con ⁇ ventional way for a DECT radio connection, and with a parallel part W2 for wireline access, which takes care of the connection to the two-wire line.
  • a frequency band of 20 MHz between 1880 MHz...1900 MHz is re ⁇ served for the DECT system.
  • the interval between the RF channels (carrier waves) is 1.728 MHz.
  • the average transmission power is only 10 mW, which allows for a long operating time while it on the other hand reduces the price of the telephone.
  • a frame structure used on the DECT radio path RP is il ⁇ lustrated.
  • the length of one frame is 10 ms and comprises 24 successive time slots (0...23), of which the first 12 are reserved for transmission from the fixed system to the portable terminal (F ⁇ P) and the last 12 for transmission from the portable terminal to the fixed system (P ⁇ F). Consequently the physical channels of the DECT system are thus formed by using the so called MC - TDMA/ TDD principle (Multi Carrier Time Division Multiple Access / Time Divi ⁇ sion Duplex).
  • the length of one time slot is 416.7 ⁇ s.
  • the length of the burst transmitted in a time slot is 364.6 ⁇ s and there are a total of 420 bits in it.
  • This burst constitutes a packet (PHL Packet) of the physical layer of the DECT system, and is marked with the reference mark PHL_P.
  • the burst comprises a synchronization field SYNC of 32 bits and a subsequent data field DATA of 388 bits.
  • the data field comprises a packet (MAC Packet) of the MAC layer (Media Access Control) of the DECT system and is marked with the reference mark MAC_P.
  • MAC Packet MAC Packet
  • MAC_P Media Access Control
  • field A So the transmission capacity (4.8 kbit s) of field A is shared between these channels.
  • the remaining part CRC (16 bits) of field A is reserved for error control of the data.
  • field B user in ⁇ formation (l-channel) is transmitted as a 320 bit long burst.
  • the remaining part X (4 bits) of field B is defined by some of the bits of the l-channel and they are used for detecting disturbances.
  • FIG. 4 shows a frame structure that is used in the two-wire line.
  • the frame length is 10 ms in both directions of transmission and the frame preferably comprises 12 successive time slots, in each one of which a packet PHL_P of the physical layer of the DECT system is (preferably) transmitted. In this way a speed of ca 504 kbit/s is achieved in both directions of transmission.
  • FIG. 5 those parts of a portable DECT terminal PT that relate to the present invention are described.
  • the starting point is that in a portable terminal there is always an interface through which the DECT packets (preferably packets of the physical layer) can be transmitted in both directions of transmission.
  • This interface has been marked with the reference mark PI.
  • the packetizing and depacketizing of the packets takes place in unit 51 , which depacketizes the arriving packets into bit streams corresponding to the differ ⁇ ent channels (I, P, C and Q) and packetizes these bit streams in the transmit- ting direction.
  • a selecting unit 52 has been ar ⁇ ranged in the above mentioned interface, to select the mode by which the ter ⁇ minal will be connected to the fixed parts of the network, in other words, whether access will be made via the radio path or the two-wire line.
  • the selec ⁇ tion signal of the access mode has been marked with the reference mark CTRL.
  • the selecting unit connects the packetizing and depacketizing unit ei ⁇ ther to the RF subsystem W1 or to the subsystem W2 of the fixed system to which, in turn, one or more two-wire lines WL have been connected.
  • FIG 6 the structure of the subsystem W2 is illustrated.
  • frames according to Figure 4 are formed in unit 61 , the frames being fed into a modulator / demodulator part 62.
  • the modulator / demodulator part uses a modulation method suitable for the (copper) two-wire line, e.g. QAM or 2B1Q modulation.
  • From the modulator the transmission signal is fed both to an adaptive echo canceller unit 63 and via a hybrid 64 to the two-wire line WL.
  • the hybrid performs the conversion from a 2-cable conductor to a 4-cable conductor in a manner known per se.
  • the received signal RX is connected via the hybrid to the echo canceller unit 63 that cancels the component (echo) corresponding to the transmission signal from the received signal.
  • the signal so obtained is de ⁇ modulated in unit 62 and the frames are depacketized in unit 61.
  • a subsystem W2 essentially similar to the one in the portable terminal.
  • the two-wire line can be con ⁇ nected either to the Radio Fixed Part or a common control fixed part CCFP.
  • the subsystem W1 is not described in greater detail here, since it is implemented in a manner known per se.

Landscapes

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

Abstract

Procédé de connexion d'un terminal portatif à un système de transmission de données basé sur le système d'accès multiple à répartition dans le temps (AMRT), tel que le système DECT (norme européenne des télécommunications sans fil numériques). Selon ce procédé, des terminaux portatifs (PT) sont connectés à des parties fixes du système (FS) sur un trajet radioélectrique (RP), par l'intermédiaire duquel des trames AMRT successives, divisées en tranches de temps successives, sont transmises. Afin que l'on puisse combiner aisément et efficacement les avantages du réseau fixe et ceux du réseau sans fil, on ménage un trajet de transmission sur le trajet radioélectrique, de la ligne à deux fils (WL), de sorte que (a) la transmission sur la ligne à deux fils a lieu dans les deux directions simultanément dans des trames dont la longueur correspond essentiellement à la trame AMRT, et (b) les tranches de temps des trames sont constituées des paquets de données (PHL_P; MAC_P) qui ont été constitués pour le trajet radioélectrique dans le terminal portatif.
PCT/FI1997/000166 1996-03-14 1997-03-13 Procede de connexion d'une station mobile a un reseau amrt WO1997034378A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU19283/97A AU1928397A (en) 1996-03-14 1997-03-13 Method for connecting mobile station to tdma-based network
EP97907120A EP0878066A2 (fr) 1996-03-14 1997-03-13 Procede de connexion d'une station mobile a un reseau amrt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI961207A FI102935B (fi) 1996-03-14 1996-03-14 Menetelmä matkaviestimen kytkemiseksi TDMA-pohjaiseen verkkoon
FI961207 1996-03-14

Publications (2)

Publication Number Publication Date
WO1997034378A2 true WO1997034378A2 (fr) 1997-09-18
WO1997034378A3 WO1997034378A3 (fr) 1997-11-06

Family

ID=8545663

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000166 WO1997034378A2 (fr) 1996-03-14 1997-03-13 Procede de connexion d'une station mobile a un reseau amrt

Country Status (5)

Country Link
EP (1) EP0878066A2 (fr)
CN (1) CN1213470A (fr)
AU (1) AU1928397A (fr)
FI (1) FI102935B (fr)
WO (1) WO1997034378A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9838073B2 (en) 2012-06-20 2017-12-05 Huawei Technologies Co., Ltd. Processing method based on OFDM-TDMA two-way service and communications device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7228072B2 (en) * 2001-10-16 2007-06-05 Telefonaktiebolaget Lm Ericsson (Publ) System and method for integrating a fiber optic fixed access network and a fiber optic radio access network
EP1817894B1 (fr) * 2004-11-24 2011-03-16 Koninklijke Philips Electronics N.V. Systeme de surveillance de patient de telemetrie base sur un protocole internet

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3434686A1 (de) * 1984-09-21 1986-04-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schnurloses telefon
JPH03109848A (ja) * 1989-09-25 1991-05-09 Hitachi Ltd 通信システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9838073B2 (en) 2012-06-20 2017-12-05 Huawei Technologies Co., Ltd. Processing method based on OFDM-TDMA two-way service and communications device

Also Published As

Publication number Publication date
WO1997034378A3 (fr) 1997-11-06
CN1213470A (zh) 1999-04-07
FI961207A0 (fi) 1996-03-14
FI102935B1 (fi) 1999-03-15
FI961207L (fi) 1997-09-15
FI102935B (fi) 1999-03-15
EP0878066A2 (fr) 1998-11-18
AU1928397A (en) 1997-10-01

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