EP0781496A1 - Procede et appareil de selection d'un canal radioelectrique - Google Patents

Procede et appareil de selection d'un canal radioelectrique

Info

Publication number
EP0781496A1
EP0781496A1 EP95931280A EP95931280A EP0781496A1 EP 0781496 A1 EP0781496 A1 EP 0781496A1 EP 95931280 A EP95931280 A EP 95931280A EP 95931280 A EP95931280 A EP 95931280A EP 0781496 A1 EP0781496 A1 EP 0781496A1
Authority
EP
European Patent Office
Prior art keywords
unit
control messages
transmitting
carrier radio
data
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Withdrawn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
EP95931280A
Other languages
German (de)
English (en)
Inventor
David Charles Brock
Rupert Leslie Alexander Goodings
Paul Maxwell Martin
Roger James Mcarthur
Christopher John Shore
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.)
Ionica International Ltd
Original Assignee
Ionica International Ltd
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 Ionica International Ltd filed Critical Ionica International Ltd
Publication of EP0781496A1 publication Critical patent/EP0781496A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • This invention relates to digital data and control message transmission in predetermined
  • the present invention relates to a method of transmitting control messages in predetermined time slots within fixed length time frames from a first transmitting and receiving unit to a second transmitting and receiving unit for controlling the second unit, the control message comprising data of the availability of carrier radio frequencies to the second unit for communication with first unit.
  • the availability data indicates which carrier radio frequencies are preferred for use, which are less preferred for use, and which are not for use. It is preferred that the availability data is updated
  • the invention also relates to a corresponding method of transmitting digital data signals, a transmitter, and communication means.
  • Figure 1 is a schematic diagram illustrating the system including a base station (BTE - Base Terminating Equipment) and subscriber unit (NTE - Network Terminating
  • Figure 2 is a diagram illustrating frame structure and timing for a duplex link
  • Figure 3 is a diagram representing a slot-list message from a base station.
  • the preferred system is part of a telephone system in which the
  • the preferred system includes the duplex radio link, and transmitters and receivers for implementing the necessary protocol.
  • the preferred system includes the duplex radio link, and transmitters and receivers for implementing the necessary protocol.
  • GSM digital cellular mobile telephone systems
  • GSM Global System for Mobile communications
  • PHY Physical
  • MAC Medium Access Control
  • DLC Data Link Control
  • NWK Network
  • directional antennae and mains electricity can be used.
  • Each base station in the preferred system provides six duplex radio links at twelve frequencies chosen from the overall frequency allocation, so as to minimise interference between base stations nearby.
  • the frame structure and timing for the duplex link is illustrated in Figure 2.
  • Each duplex radio link comprises an up-link from a subscriber unit to a base station and, at a fixed frequency offset, a down-link from the base station to the subscriber unit.
  • the down-links are TDM, and the up-links are TDMA.
  • Modulation for all links is n/4 - DQPSK, and the basic frame structure for all links is ten slots per frame of 2560 bits, i.e. 256 bits per slot.
  • the bit rate is 512kbps.
  • Down ⁇ links are continuously transmitted and incorporate a b- ⁇ dcast channel for essential system information. When there is no useful information to be transmitted, the downlink transmission continues to use the basic frame and slot structure and contain a suitable fill pattern and essential broadcast channel.
  • normal slots which are used after call set-up
  • pilot slots which are used during call set-up
  • Each down-link normal slot comprises 24 bits of synchronisation information followed by 24 bits designated S-field which includes an 8 bit header, followed by 160 bits designated D-field. This is followed by 24 bits of Forward Error Correction, and an 8 bit tail, followed by 12 bits of broadcast channel.
  • the broadcast channel consists of segments in each of the slots within a frame which together form the down-link common signalling channel which is transmitted by the base station, and contains control messages containing link information such as slot lists, multi-frame and super-frame information and other information, connectionless messages and information basic to the operation of the system.
  • each down-link slot contains frequency correction data and/or a training sequence for receiver initialisation with only a short S- field and no D- field
  • Up-link slots basically contain two different types of data packet.
  • pilot packet is used before a connection is set up, for example, for an
  • ALOHA call request and to allow adaptive time alignment.
  • the other type of data is
  • a normal packet is used when a call has been established and is a larger data packet, due to the use of adaptive time alignment.
  • Each up-link normal packet contains a data packet of 244 bits which is preceded and followed by a ramp of 4 bits duration.
  • the ramps and the remaining bits left of the 256 bit slot provide a guard gap against interference from neighbouring slots due to timing
  • Each subscriber unit adjusts the timing of its slot transmissions to compensate for the time it takes signals to reach the base station.
  • Each up-link pilot slot contains a pilot data packet which is 92 bits long preceded and followed by 4 bit ramp defining an extended guard gap of 60 bits. This larger guard gap is necessary because there is no timing information available, and without it,
  • the pilot packet comprises 64 bits of sync followed by 104 bits of S-field which starts with an 8 bit header and finishes with a 16 bit Cyclic Redundancy Check 2 reserved bits, 14 forward error correction FEC bits, and 8 tail bits. There is no D-field.
  • the S-fields in the above mentioned data packets can be used for two types of signalling.
  • the first type is MAC signalling (MS) and is used for signalling between the MAC layer of the base station and the MAC layer of a subscriber unit in which timing is important.
  • the second type is called associated signalling, which can be slow or fast, and is used for signalling between the base station and the subscriber units in the DLC or NWK layers.
  • General encryption is provided by combining the speech or data with a non-predictable sequence of cipher bits produced by a key stream generator which is synchronised to the transmitted super-frame number.
  • the transmitted signal is scrambled to remove dc components.
  • a slotted Aloha protocol is used by subscriber units to send call set-up requests and short information messages (Datagrams) to the base station. These requests and messages are sent in a pilot packet in one of a list of slots, known as Aloha slots, that have been designated as available for this purpose in a Slot-List broadcast by the base station.
  • a typical slot-list broadcast is illustrated in Figure 3.
  • a slot-list is valid for a multiframe, which consists of sixteen consecutive frames numbered 0 - 15, and is broadcast in one multiframe to be applicable to the following multiframe. The number
  • Each slot-list message may designate up to three Aloha slots, as shown in the Figure 3.
  • a minimum number of slot-list messages are used, and these are each assigned a sequence number and are sent in ascending order, and are re-transmitted in the same order following complete transmission within the same multiframe. Typically, however, a single slot-list message will be sufficient to transmit the complete Slot-List.
  • the broadcast channel itself comprises a predetermined portion of each slot in every frame of the multiframe, and is used to broadcast various messages besides slot-list messages. Furthermore, different priorities are allocated to these different types of messages. Thus in frames 0 to 7 of a multiframe, slot-list messages have the lowest priority, and may not be transmitted because of the volume of other messages. However, slot-list messages are given a high priority in frames 8, 9, 12 and 13 so that transmission of at least a part, and most probably all, of the Slot-List is guaranteed.
  • the information in the Slot-List is encoded for reduced bandwidth, and has to be decided by reference to a Carrier-List which includes details of bearer frequencies.
  • This Carrier-List is also transmitted in the broadcast channel in frame 15 of the multiframe preceding that in which the Slot-List is transmitted.
  • the base station sends information specific to each subscriber unit of which RF carrier
  • Each subscriber unit stores this information.
  • RF frequencies are categorised as 'black' if, for example, their use by one sector is
  • the base station controls which slots are to be included in the Slot-List taking into
  • the Aloha slots can be
  • An Access Control Indicator is incorporated in each slot-list message and is the same for all segments of a segmented slot-list message.
  • the Access Control Indicator is used
  • the Access Control Indicator may take an integer value between 1 and 4.
  • the services may take an integer value between 1 and 4.
  • Each subscriber unit maintains a Classified Carrier-List corresponding to the information
  • a subscriber unit receives Aloha slot-list messages on the broadcast channel, starting with the first slot-list message in a multi frame, and compiles a valid Slot-List for the
  • Classified Carrier-List or which are not of the appropriate type (call set-up requests or
  • RF frequencies categorised 'white' are preferred to those categorised 'grey'.
  • the subscriber unit Following reception of the final slot-list message in a sequence, the subscriber unit
  • a message which is either a datagram or a
  • the datagram or call set-up request is sent to the base station in the selected slot at the next possible opportunity according to the setting of an extended Aloha parameter e broadcast by the base station.
  • the extended Aloha parameter e is set to 1, then the message to be sent is transmitted once in the next frame. If the parameter e is set to 2, then the message is transmitted in the next frame in the set (0,2,4,6,8,10,12,14), and is repeated in the frame immediately following that in which it was first transmitted, for example, if the current frame is 5, the message shall be transmitted in frames 6 and 7. If the parameter e is set to 4, then the message is transmitted in the next frame in the set (0,4,8.12), and the message is repeated in the three consecutive frames following that in which it was first transmitted, for example, if the current frame is 5, the message shall be transmitted in frames 8,9,10,11.
  • the subscriber unit Following transmission of a message, the subscriber unit then listens to the broadcast channel for 16-e frames and compiles a valid Slot-List for the following multiframe, and selects one of the slots x at random in case a re-transmission is required. However, if
  • the subscriber unit receives an acknowledgement message from the base station in the broadcast channel, then the subscriber unit takes
  • a re-transmission counter is incremented each time the call set-up request is transmitted so as to monitor the number of re-transmissions.
  • the call set-up request shall be transmitted in frames 8,9,10, 11.
  • Base stations send slot list messages to subscriber units and manage slot lists dependent on the Carrier-lists they have stored for each associated subscriber unit. Where certain RF frequencies are designated as not to be used ('black'), the base station manages slot list messages so as to ensure that each subscriber unit always has an RF frequency available for use. In particular, at periods of high loading where selected classes of subscriber units are restricted from making calls, the base station operates to ensure that an Aloha slot will be available to a subscriber unit within a predetermined time period.
  • the network has the following means of controlling access:
  • PSTN Public Telephone Switched Network
  • the level of usage in the network is monitored and calls are progressively restricted, as
  • subscribers can be normal users, priority B users or priority A users as described above, each type of user having a different access priority. Subscribers sharing a subscriber unit can have different priorities.
  • the highest threshold the last two channels are reserved for emergency calls only. Thus where there are say 60 channels (time slot/carrier frequency combinations), at a time of high loading the call set-up request for the 59th PSTN call at that time would be refused unless it is an emergency call.
  • the number of reserved channels at the highest threshold can be other than two.
  • the base station monitors, over time, the success of Public Switched Telephone Network (PSTN) calls and test calls on each RF frequency to each subscriber unit with which it communicates by radio.
  • PSTN Public Switched Telephone Network
  • an RF frequency is recategorised. For example, an RF frequency categorised as 'white' can be automatically reclassified as 'grey' should the frequency be unavailable for successful call transmission for more than a predetermined percentage of time. Conversely, 'grey' frequencies which are monitoried as becoming sufficiently reliable are re-categorised as 'white'.
  • the updated Classified Carrier list for each subscriber unit is updated periodically.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transceivers (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Selective Calling Equipment (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Radio Relay Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Dans un système de télécommunications dans des intervalles temporels prédéterminés à l'intérieur de tranches de temps de longueur fixe, des données définissant les porteuses radioélectriques disponibles à une unité d'émission/réception sont envoyées à ladite unité, afin de réguler ses communications.
EP95931280A 1994-09-16 1995-09-08 Procede et appareil de selection d'un canal radioelectrique Withdrawn EP0781496A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9418747A GB9418747D0 (en) 1994-09-16 1994-09-16 Digital telephony
GB9418747 1994-09-16
PCT/GB1995/002128 WO1996008938A1 (fr) 1994-09-16 1995-09-08 Procede et appareil de selection d'un canal radioelectrique

Publications (1)

Publication Number Publication Date
EP0781496A1 true EP0781496A1 (fr) 1997-07-02

Family

ID=10761481

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95931280A Withdrawn EP0781496A1 (fr) 1994-09-16 1995-09-08 Procede et appareil de selection d'un canal radioelectrique
EP95931284A Expired - Lifetime EP0781497B1 (fr) 1994-09-16 1995-09-08 Procede de restriction d'acces a une voie en fonction des categories d'abonnes et du chargement du systeme

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP95931284A Expired - Lifetime EP0781497B1 (fr) 1994-09-16 1995-09-08 Procede de restriction d'acces a une voie en fonction des categories d'abonnes et du chargement du systeme

Country Status (13)

Country Link
EP (2) EP0781496A1 (fr)
JP (2) JPH10505968A (fr)
CN (1) CN1160473A (fr)
AT (1) ATE193631T1 (fr)
AU (2) AU3477495A (fr)
BR (2) BR9508942A (fr)
DE (1) DE69517328D1 (fr)
FI (2) FI971096A (fr)
GB (1) GB9418747D0 (fr)
IL (2) IL115151A (fr)
MX (2) MX9701976A (fr)
WO (2) WO1996008939A1 (fr)
ZA (2) ZA957742B (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6088342A (en) * 1997-05-05 2000-07-11 Nokia Mobile Phones Limited Dynamic configuration of radio link protocol in a telecommunications system
FI101920B1 (fi) 1996-06-07 1998-09-15 Nokia Telecommunications Oy Kanavanvarausmenetelmä pakettiverkkoa varten
US6567416B1 (en) 1997-10-14 2003-05-20 Lucent Technologies Inc. Method for access control in a multiple access system for communications networks
EP0939569A1 (fr) * 1998-02-19 1999-09-01 ICO Services Ltd. Distribution des informations de contrÔle dans un système de communication mobile AMRT
KR100272109B1 (ko) * 1998-08-21 2000-11-15 윤종용 효율적 무선 자원 할당을 위한 무선통신 장치 및 그 운용 방법
DE19910239B4 (de) * 1999-03-08 2011-01-05 Ipcom Gmbh & Co. Kg Verfahren zur Vergabe von Zugriffsrechten auf einen Telekommuniaktionskanal an Teilnehmerstationen eines Telekommunikationsnetzes und Teilnehmerstation
USRE47895E1 (en) 1999-03-08 2020-03-03 Ipcom Gmbh & Co. Kg Method of allocating access rights to a telecommunications channel to subscriber stations of a telecommunications network and subscriber station
DE19913363A1 (de) * 1999-03-24 2000-10-05 Siemens Ag Verfahren und Einrichtung für eine Verbindungsaufnahme innerhalb eines digitalen Funk-Kommunikationssystems
JP2002202927A (ja) 2000-11-02 2002-07-19 Sony Computer Entertainment Inc エンタテインメントシステム、サーバ装置、コンテンツの配信方法、コンテンツ配信プログラム、及びコンテンツ配信プログラムが記憶された記憶媒体
CN101222750B (zh) * 2007-01-09 2014-07-09 华为技术有限公司 处理紧急呼叫、紧急呼叫回叫中被叫用户的方法及其应用
WO2009145301A1 (fr) 2008-05-29 2009-12-03 株式会社エヌ・ティ・ティ・ドコモ Procédé de communication mobile et station mobile
GB2465192B (en) * 2008-11-10 2011-03-30 Samsung Electronics Co Ltd Controlling connection establishment
GB2488512B (en) 2011-01-28 2015-03-11 Sca Ipla Holdings Inc Telecommunications method and system

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Publication number Priority date Publication date Assignee Title
JPH0822100B2 (ja) * 1989-09-19 1996-03-04 日本電信電話株式会社 移動通信無線制御チャネル構成方式
CA2063901C (fr) * 1991-03-25 2002-08-13 Arunas G. Slekys Systeme de transmission de donnees en chevauchement dans un systeme cellulaire
GB2277849B (en) * 1993-05-06 1997-09-10 Spectronics Micro Syst Ltd Radio communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9608938A1 *

Also Published As

Publication number Publication date
AU3477895A (en) 1996-03-29
BR9508942A (pt) 1997-11-11
ZA957743B (en) 1996-05-06
FI971095A0 (fi) 1997-03-14
MX9701976A (es) 1998-02-28
IL115150A0 (en) 1995-12-31
WO1996008939A1 (fr) 1996-03-21
EP0781497B1 (fr) 2000-05-31
IL115151A0 (en) 1995-12-31
JPH10505968A (ja) 1998-06-09
IL115150A (en) 1998-12-27
GB9418747D0 (en) 1994-11-02
BR9509340A (pt) 1997-11-04
IL115151A (en) 1999-12-31
CN1160473A (zh) 1997-09-24
EP0781497A1 (fr) 1997-07-02
JPH10505965A (ja) 1998-06-09
WO1996008938A1 (fr) 1996-03-21
AU3477495A (en) 1996-03-29
ATE193631T1 (de) 2000-06-15
FI971096A0 (fi) 1997-03-14
FI971095A (fi) 1997-03-14
ZA957742B (en) 1996-05-06
MX9701972A (es) 1998-02-28
FI971096A (fi) 1997-03-14
DE69517328D1 (de) 2000-07-06

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