WO1996024228A1 - Dispositif dans un systeme dect - Google Patents

Dispositif dans un systeme dect Download PDF

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Publication number
WO1996024228A1
WO1996024228A1 PCT/SE1996/000098 SE9600098W WO9624228A1 WO 1996024228 A1 WO1996024228 A1 WO 1996024228A1 SE 9600098 W SE9600098 W SE 9600098W WO 9624228 A1 WO9624228 A1 WO 9624228A1
Authority
WO
WIPO (PCT)
Prior art keywords
dect
synchronization
base station
network
virtual base
Prior art date
Application number
PCT/SE1996/000098
Other languages
English (en)
Inventor
Peter Olanders
Original Assignee
Telia Ab
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 Telia Ab filed Critical Telia Ab
Publication of WO1996024228A1 publication Critical patent/WO1996024228A1/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
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools
    • H04W16/20—Network planning tools for indoor coverage or short range network deployment

Definitions

  • the present invention relates to a device at DECT-system showing a central base and a number of virtual bases and where an existing network, for instance a cable- or communal antenna network, is included in the distribution function within the system.
  • the DECT-system operates with synchronization function for synchronization of respective virtual base to the central base.
  • the synchronization function can be related to the amplifiers of the virtual bases.
  • SUBSTlWn SHEET(RULE26) mentioned qualities and where mainly fibre optical distribution of telephone- and TV-signals is used.
  • DECT is a low power system with peak power of maximally 250 mW ERP with a bandwidth of 2 MHz, so and therefore it can be difficult to reach all dwellings within a multi-family district.
  • a "multi-family district” is in this context referred to block of flats and continuous district of private houses. This normally requires a concentration of base stations, or repeaters, which technically complicates the system and also makes new establishments more expensive.
  • the invention intends to solve among other things this problem.
  • the present invention is based on the use of simple, bidirectional amplifiers at each coaxial cable outlet. Since DECT is a TDMA/TDD- system, the synchronization of the following amplifiers, which constitue the virtual DECT base stations, is of great importance. Poor synchronization will reduce the quality considerably and can for instance reduce the radio range dramatically.
  • the frame length which can consist of the time of 12+12 time slots is 10 is, which for instance implies that user data become 32 kbit/s (ADPCM).
  • the new device according to the present invention is regarded to be characterized in that the carrier of the DECT-system is utilized as norm for achieving synchronization.
  • the deviation of the synchronization is as most of the size ⁇ 0.01 ms or ⁇ 0.1 Hz/0,1 % in the case half of the synchronization frequency is used.
  • the slots 0 and 12 are sacrified in both down link and up link from capacity point of wiev in the DECT-system. This will have as a result that it will be possible with deviations in the synchronization pulse with ⁇ 0.2 ms/ ⁇ 2
  • the DECT- system also can be arranged to cooperate with distribution networks in the form of cable-TV networks or communal antenna networks.
  • the DECT-system can be connected to a central point or node in a cable- TV network or communal antenna network to obtain wide coverage in a multi-family district where blocks of flats, private houses etc, are included.
  • the antenna outlets in each flat/private house will in this way act as a virtual base in the DECT-system by an antenna being connected to the coaxial cable in the flat.
  • Figure 1 in vertical section shows installation in a block of flats
  • Figure 2 shows the construction of the frame structure in the DECT-system
  • FIG. 3 in the form of a principal diagram shows a known DECT-system.
  • the invention is based on existing cable- or communal antenna network being used as distribution network, together with necessary equipment to amplify and transmit the DECT-signalling. Two solutions are presented for this; one "central” solution and one distributed solution.
  • Communal antenna networks (this term is here also used for cable-TV-networks) are often arranged as star networks, with a number of connections on each arm.
  • the networks are used for transmission of TV-signals, in most cases within the frequency range 50-1000 MHz.
  • As medium is predominantly used coaxial cable, which can very well be used for transmission of 2 GHz (the operating frequency of DECT), if yet with some higher attenuation than at the TV-frequencies.
  • the communal antenna outlets, see Figure 1, in the dwellings contain in most cases some form of high pass filters for that part of the signal which is above the radio broadcasting band (88-108 MHz), and some form of attenuator/direction coupler to prevent influence on the network from individual TV-sets. These filters, attenuators and direction couplers can be by-passed the equipment which shall transmit DECT-signalling.
  • a DECT-station In a district with blocks of flats and private houses a DECT-station can be placed in a node for the communal antenna network; such nodes in most cases exist one in each block of flats or one in each district of private houses.
  • the DECT-base station can be equipped with that number of radio units which are needed to give sufficiently high capacity within the district.
  • a DECT- base station can be extended to a maximal capacity of
  • This arrangement can be said to create a virtual DECT- base station at each communal antenna outlet, thereby making accessible for a user all the (technical) facilities and services which the DECT-standard contains, and share the capacity of the base station with other users as if all users were in the immediate vicinity of the real base station.
  • the two embodiments complete each other; which is selected if an installation is made depends on the architecture and quality of the cable-TV network.
  • the output power must not be higher than 250 mW, which is measured at the "antenna outlet" of the DECT-equipment.
  • the DECT-signals need to be somewhat amplified to compensate for the losses which originate from the communal antenna network.
  • this is made by a centrally located unit (amplifier) directly connected to the DECT base station (as a booster), which is connected to N in the figure.
  • the amplifier must be bidirectional (both up- and down link) . In order not to cause unwanted resonance the amplifier is equipped with signalling to the DECT base station making the units synchronized.
  • the advantages with this embodiment is that the level for each amplifier can be individually adjusted, and that received signals (down link) are amplified as early as they cannot drown in the noise.
  • Figure 2 shows the in itself known construction of the TDMA/TDD-structure of the DECT-system. Since the structure is known it will not be described in details here. See however the discussion under "Technical problems" above.
  • FIG 3 a central base station in a known DECT-system 1 and virtual bases 2, 2', 2".
  • the synchronization unit according to the above is shown with la.
  • the connection with controlling station in the DECT-system is symbolized with 4.
  • the DECT-carrier is utilized as norm.
  • the deviation of the synchronization should be max. ⁇ 0.01 ms, or ⁇ 0.1 Hz (0.1%) if a bit less than half of the synchronzation frequency is allowed to be used (see Figure 2) .
  • the deviation of the synchronization pulse may be ut to ⁇ 0.2 ms or ⁇ 2 Hz, if up to about half a timeslot is sacrified for synchronization.
  • the demands for accuracy on the synchronization pulse can be said to be between 0.1% and 2%. (The upper limit with some reservation since such an arrangement for instance may demand extra equipment) .
  • the operating frequency of DECT is 1880-2000 Mhz, which can be expressed as 1900 Mhz ⁇ 0.5%. It is by that possible to use the carrier frequency of DECT as generator for the synchronization in VB.
  • A 4 bits which may me used to detect packet collisions.

Landscapes

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

Abstract

Un système DECT comporte une station de base centrale et un certain nombre de stations de base virtuelles. Un réseau de distribution existant, par exemple un réseau de câbles ou d'antennes communautaires, est utilisé par le système DECT, lequel opère par le biais d'une fonction de synchronisation pour synchroniser chaque station de base virtuelle respective avec la station de base centrale. Cette fonction de synchronisation peut être associée aux amplificateurs des stations de base virtuelles, où la porteuse du système DECT est utilisée de manière standard pour effectuer la synchronisation.
PCT/SE1996/000098 1995-02-01 1996-01-30 Dispositif dans un systeme dect WO1996024228A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9500365-3 1995-02-01
SE9500365A SE514245C2 (sv) 1995-02-01 1995-02-01 Synkronisering av virtuella basstationer vid ett DECT-system

Publications (1)

Publication Number Publication Date
WO1996024228A1 true WO1996024228A1 (fr) 1996-08-08

Family

ID=20397055

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000098 WO1996024228A1 (fr) 1995-02-01 1996-01-30 Dispositif dans un systeme dect

Country Status (2)

Country Link
SE (1) SE514245C2 (fr)
WO (1) WO1996024228A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001093459A1 (fr) * 2000-05-31 2001-12-06 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif et procede de synchronisation d'un element de reseau de telecommunications
EP1164721A2 (fr) * 2000-06-15 2001-12-19 Pace Micro Technology Ltd Synchronisation de système de télécommunication sans fils numérique amélioré
US6594827B1 (en) * 1996-07-19 2003-07-15 Telefonaktiebolaget Lm Ericsson (Publ) Method and an arrangement for integrated radio telecommunication via a CATV network

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526285A2 (fr) * 1991-07-29 1993-02-03 Cable Television Laboratories Inc. Système pour la distribution de signaux de radiotéléphone sur un réseau de télévision par câble
WO1994018764A1 (fr) * 1993-02-15 1994-08-18 At & T Wireless Communications Products Limited Ameliorations apportees a des systemes de communications duplex

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526285A2 (fr) * 1991-07-29 1993-02-03 Cable Television Laboratories Inc. Système pour la distribution de signaux de radiotéléphone sur un réseau de télévision par câble
WO1994018764A1 (fr) * 1993-02-15 1994-08-18 At & T Wireless Communications Products Limited Ameliorations apportees a des systemes de communications duplex

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
41ST IEEE VEHICULAR TECHNOLOGY CONFERENCE, Gateway to the Future Technology in Motion, 19-22 May 1991, ST. LOUIS MO, page 257. *
INTERNATIONAL CONFERENCE ON COMMUNICATIONS CONFERENCE RECORD/INTERNATIONAL CONFERENCE ON COMMUNICATIONS 1992, (Chicago, 14-18 June 1992), IEEE COP. 1992, page 87. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6594827B1 (en) * 1996-07-19 2003-07-15 Telefonaktiebolaget Lm Ericsson (Publ) Method and an arrangement for integrated radio telecommunication via a CATV network
WO2001093459A1 (fr) * 2000-05-31 2001-12-06 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif et procede de synchronisation d'un element de reseau de telecommunications
EP1164721A2 (fr) * 2000-06-15 2001-12-19 Pace Micro Technology Ltd Synchronisation de système de télécommunication sans fils numérique amélioré
EP1164721A3 (fr) * 2000-06-15 2003-04-02 Pace Micro Technology Ltd Synchronisation de système de télécommunication sans fils numérique amélioré

Also Published As

Publication number Publication date
SE9500365L (sv) 1995-07-19
SE9500365D0 (sv) 1995-02-01
SE514245C2 (sv) 2001-01-29

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