Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B17/00—Monitoring; Testing
  • H04B17/30—Monitoring; Testing of propagation channels
  • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/02—Access restriction performed under specific conditions
  • H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed

Definitions

• This invention relates to a device capable of identifying the presence of
• electromagnetic interference generates
• This invention aims to respond to these problems or at least avoid them; she
• This device can identify cellphones / mobiles *, powered up and
• CDPC CDPC, RAM-Mobiles (MAN), Ardia-RD ⁇ LAP (MAN), IEEE 802.1 IWireless LAN ”).
• This type of detection does not cover the case where the phone is in standby, but is
• the definition of a radio interface is based on
• GSM is a TDMA medium band (200 KHZ) duplexing system
• the GSM system is more resistant to jamming and
• channel coding devices allow lowering
• GSM radio-mobile
• DCS variants at 1800 or 1900 MHZ relate only to the bands used.
• a GSM network can include both
• DCS system is a priori micro cellular.
• GSM 900 and DCS 1800 are based on architecture and
• the term mobile station denotes, terminal equipment provided with a SIM card
• portable and portable workstations accept card-sized SIM cards (full-sized SIM),
• the standard defines for the terminals several classes according to their power
• the terminals are class 2, i.e. a power of 8 W.
• the terminals are class 2, i.e. a power of 8 W.
• the terminals reduce the transmission power according to the requests of the
• the minimum emission level is 3 mW (5 dBm) in GSM 900 and 1 mW
• the power of the terminals of course conditions their range: in 900 MHZ, a
• the minimum sensitivity of the terminals is - 100 dBm for equipment
• a powered mobile station must be able to receive calls.
• the mobile is
• a voice beacon and constantly monitor its environment to detect a
• the choice of the beacon is made according to radio criteria, to ensure
• the terminal that the terminal is able to communicate with a quality of service
• a dedicated logical channel provides a resource reserved for a mobile. This one
• the dedicated channels are duplex.
• a non-dedicated logical channel is simplex and shared by a set of mobiles.
• This data can concern the system as a whole or mobiles
• the ALOHA slot is used: the slot supporting the access function
• Random Access is a priori available to a set of mobiles.
• TCH single cell mobile
• SACCH Slow Associated Control Channel
• the SACCH channel supports the following information:
• a SACCH carries blocks of information of 184 useful bits.
• RACH channel Random Access Channel
• the RACH channel contains 8 useful bits.
• the burst used is shorter than the normal burst because the mobile does not know the
• the holding time is therefore 252 ⁇ s, which makes it possible to envisage with this
• the synchronization sequence at a length of 41 bits, longer than for
• the RACH channel contains 8 useful bits. These are protected by 6 bits of CRC.
• the base station When the base station receives a request for random access, it verifies that it
• encoded data forms a 36-bit word.
• a request contains between 3 and 6 bits indicating the category of the service requested and a
• this system has the function of intercepting cell phones in operational standby or reception mode, operating on mobile telephone networks of the SFR, Bouygues or Itinéris type, with a GSM central frequency of 902 MHz and an RF bandwidth GSM of 25 MHz or for DCS 1800 standards, a central frequency of 1748 MHz and a bandwidth of 75 MHz.
• the out-of-band rejection is for GSM of -9 dBc (approximately), for f ⁇ 870 MHz and f> 935 MHz and for DCS 1800 of
• the box is equipped with a vertical antenna 96 mm high, of which the part outside the box measures 82 mm; this antenna is vertically polarized, with an adjustable sensitivity of 9 nW / cm 2 (approximately).
• the box is equipped with a signal socket allowing to emulate a peripheral.
• the box is equipped with a power supply with a switchable input voltage of
• the electronic system (Diagrams 1/4, 2/4, 3/4, 4/4) consists on the one hand, of modules for processing analog signals:
• - reception antenna a standard antenna equivalent to GSM (900 MHz) is used,
• VCO (1.25 GHz), VCO (400 MHz), a filter (400 MHz), a filter (800 MHz), UMA 1019.
• the electronic system also consists of modules for processing digital data: detection: standard components equivalent to PCF5083 are used, an LED, a ROM. Finally, the electronic system is equipped with a specific power supply: a standard component equivalent to the UMA1019 is used. Mode of operation of the detection system:
• the box contains all the elements in a coherent manner and allows the system to be positioned in a chosen location. It protects the electronic system, itself compliant with CE standards, from mechanical, thermal and climatic constraints in the
• the antenna transmits and receives radio waves by telephone.
• the power supply provides it with the electrical energy necessary for its operation.
• the antenna behaves like a transmit / receive beacon by carrying bidirectional analog data.
• Amplification of incoming signals optimizes recognition of said signals, allowing
• Detection is carried out using processing software for recognition of the RACH signal and triggers a light indication.
• a specific power supply provides the energy necessary for the proper functioning of this electronic part.
• This device identifies the equipment to AMPS, TACS, NMT, IS 54, IS 95 standards,
• GSM Global System for Mobile communications
• GPRS Global System for Mobile communications
• PDC Physical Downlink Packet Control
• DECT PHS
• DCS-1800 PCN
• IEEE 802.11 IEEE 802.11 networks
• Wireless, LAN, WAP ... - live and operational which can cause electromagnetic interference.
• System operation The cell phone sends a RACH radio message to a base station allowing it to be located.
• the box intercepts the pulse width signal of 48 msec (approximately), with a response time, between the detection of the mobile phone and the detection indication, of 400 msec (approximately) and lights up an indicator light confirming the presence of 'a laptop nearby.
• this system detects existing equipment such as PC, radiotelephone, portable, mobile, in single or combined version, marketed to date and secondly, extends to any device using the standards mentioned in the " Technical description of the detection system ”.

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

Applications Claiming Priority (3)

Publications (1)

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ID=8846369

Family Applications (1)

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Family Cites Families (4)

• 2000
  • 2000-01-27 FR FR0001047A patent/FR2804569B1/fr not_active Expired - Fee Related
• 2001
  • 2001-01-25 EP EP01907695A patent/EP1186194A1/de not_active Withdrawn
  • 2001-01-25 AU AU35602/01A patent/AU3560201A/en not_active Abandoned
  • 2001-01-25 WO PCT/FR2001/000236 patent/WO2001056322A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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