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WO1996038013A1 - Attribution dynamique de capacite dans un systeme de telecommunications - Google Patents

Attribution dynamique de capacite dans un systeme de telecommunications Download PDF

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Publication number
WO1996038013A1
WO1996038013A1 PCT/IB1996/000328 IB9600328W WO9638013A1 WO 1996038013 A1 WO1996038013 A1 WO 1996038013A1 IB 9600328 W IB9600328 W IB 9600328W WO 9638013 A1 WO9638013 A1 WO 9638013A1
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WO
WIPO (PCT)
Prior art keywords
zones
zone
secondary station
cells
primary
Prior art date
Application number
PCT/IB1996/000328
Other languages
English (en)
Inventor
John Richardson Bell
Original Assignee
Philips Electronics N.V.
Philips Norden 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 Philips Electronics N.V., Philips Norden Ab filed Critical Philips Electronics N.V.
Publication of WO1996038013A1 publication Critical patent/WO1996038013A1/fr

Links

Classifications

    • 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
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing

Definitions

  • the present invention relates to a telecommunications system and particularly, but not exclusively, to a high rate data message transmission system for use in sending relatively long messages such as telescript.
  • Paging systems such as POCSAG (or CCIR Radiopaging Code No. 1 ) or ERMES (a standard issued by the European Telecommunications Standards Institute (ETSI)) are capable of transmitting messages at relatively low data rates which makes them unsuited to the transmission of telescript.
  • ETSI European Telecommunications Standards Institute
  • APOC POCSAG compatible paging standard
  • a telecommunications system comprising a system controller, a plurality of primary stations, each of the primary stations comprising means for transmitting signals, each primary station defining a cell, a plurality of zones, each zone comprising a variable number of n cells, where n is an integer, and at least one secondary station, wherein the system controller dynamically allocates the capacity of the system in order to match the capacity to the current usage. If desired the dynamic allocation may be done on one or more of the following bases: regrouping of cells, time division, frequency division and/or code division.
  • the sizes of the zones may be dynamically configured or reconfigured so that if the capacity of a zone is temporarily overloaded the size of the zone is reduced by some of its primary stations being re-allocated to adjacent, less heavily used zones thus making the busy zone smaller geographically and the neighbouring ones larger. Additionally and/or alternatively additional capacity, more time slots and/or additional frequency channels may be made available.
  • a system controller for use in the telecommunications system in accordance with the present invention, the system controller comprising a controller, a secondary station location register for storing details of a cell in which the or each secondary station was last registered, means for receiving and encoding a message to be relayed to a secondary station and means for relaying the encoded message to the primary station(s) constituting the cell(s) in which the secondary station was last registered.
  • the system controller may have means for establishing a history of the cells in which a secondary station has become registered together with temporal information relating to each said registration and the controller may be programmed to take the history into account when trying to locate a secondary station.
  • a secondary station for use in the telecommunications system in accordance with the present invention, the secondary station comprising receiving means, decoding means, a location register for storing details of the zone in which the secondary station was last registered, a controller having means responsive to the zone identifier for energising the receiving means for the duration of said zone.
  • the secondary station may have transmitting means for transmitting signals to the or at least one primary station in its currently allocated zone.
  • Figure 1 is a block schematic diagram of a telecommunications system made in accordance with the present invention
  • Figure 2 is a block schematic diagram of the system controller
  • Figure 3 is a flow chart of the steps by which the system controller locates a mobile secondary station
  • Figure 4 is a block schematic diagram of a secondary station
  • Figure 5 is a diagram of the cycle/batch structure
  • Figure 6 is a diagram of a time division allocation of a single frequency between 3 zones
  • FIGS. 7A and 7B illustrate two allocations of frequency channels.
  • the same reference numerals have been used to identify corresponding features.
  • the telecommunications system comprises a plurality of geographically distributed primary or base station transceivers PS1 A, PS1 B, PS2A, PS2B, PS2C, PS3A, PS3B and PS3C coupled by respective landlines to a system controller SC.
  • the primary stations PS1 A to PS3C respectively define cells, the geographical size and shape of which depend upon the transmitter output power and topographical features which affect signal propagation.
  • One or more cells form dynamically created zones Z1 , Z2, Z3.
  • the boundaries of the zones are shown as continuous lines and those between cells of the same zone as broken lines.
  • the system controller SC comprises a suitably programmed control computer, means for receiving and formatting long data messages to be relayed to the primary stations constituting a respective zone under the control of the control computer, and means for processing signals received by the primary stations.
  • the system controller SC will be described in greater detail later with respect to F gure 2.
  • Figure 1 shows two secondary stations, a relatively fixed or transportable secondary station SS1 and a portable secondary station SS2 which is able to roam between the zones.
  • the system controller shown in Figure 2 comprises a stage 10 which has an input 1 2 to which is applied messages to be relayed to a secondary station.
  • Message data such as telescript, together with details of the addressee are received in block 10 which formats the message, appends the addressee's address code word read-out from an address code word store 1 l and if required adds a checksum.
  • the complete message is held in store 1 3.
  • the central computer 20 checks with a secondary station location store 22 to see in which cell or zone the addressed secondary station was last recorded as being located and assuming an entry is found, the stored complete message is routed by a switch 1 51 , controlled by the central computer 20, to the appropriate queue 14, 1 6, 18 of messages to be transmitted at the relevant time to secondary stations in the coverage area of the associated cell or zone.
  • a switch 1 51 controlled by the central computer 20
  • the transmission of the queue of messages by the primary station(s) in a particular cell or zone is determined by the central computer 20.
  • Control messages are exchanged between the central computer 20 and the primary stations comprising the system in order to determine the transmitter turn-on and turn-off times, which may vary as a result of measures to optimise the usage of the system capacity.
  • the control messages are sent and received by lines 1 5, 17, 1 9 coupled to terminals 24, 26, 28, respectively.
  • the queue of messages for secondary stations believed to be in that zone are read-out under the control of the central computer and relayed to the primary stations via the terminal 24, 26 or 28.
  • a time division protocol is being operated then only one of said terminals will be active at any one time. It may occur that a formatted message for a roaming secondary station whose location is not known for certain, is sent to other zones in which case that formatted message is placed in two or more queues 14, 1 6, 1 8.
  • the terminals 24, 26, 28, also act as inputs for low bit rate signals, for example registration signals, acknowledgements and simple responses to the messages transmitted, which are received by the primary stations from secondary stations.
  • a receive message store 30, 32, 34 is connected respectively to the terminals 24, 26 and 28.
  • the outputs of the stores 30, 32, 34 are supplied to respective multipliers 36, 38, 40, to each of which is connected a generator 37, 39, 41 of pseudo random bit sequences.
  • the message applied to the multiplier is multiplied by each sequence in turn until an intelligible signal is recovered, for example by correlation, and is held in another store 42, 44, 46, respectively.
  • Each of the stores is coupled to a single pole three way switch 47 which, under the control of the central computer 20, couples the store concerned to an output terminal 48.
  • signals being read out comprising registration or re-registration signals these are detected by a detector 50 and used to update the relevant entry in the location register 22.
  • Figure 3 is a flow chart relating to the steps involved when the system controller builds up a history of the cells/zones in which a secondary station has been or is registered in relation to time of day and day of the week.
  • the system controller sends what is termed an "ahoy" signai to the secondary station by way of the primary station in its last registered cell/zone. If the secondary station is still in range then at a suitable moment, it sends an answerback signal in the form of say a spread spectrum signal.
  • the system controller in block 102 checks to see if the secondary station has replied and if it has (Y) then at the next opportunity it transmits the message, block 104.
  • Block 1 14 If a negative answer (N) is given by the blocks 106 and 1 10, then in block 1 14 an all-zone "ahoy" message is transmitted by all the primary stations. In block 1 1 6 a check is made to see if the addressed secondary has replied. If the answer is No (N) then in block 1 1 8 either the message is stored and the cycle is repeated later, just in case the secondary station was temporarily unable to receive the "ahoy" signal, or the message is aborted. If a response is received (Y) then in block 1 20 the identity of the relevant cell/zone is stored in the location register and in block 122 the message is transmitted at the relevant opportunity. Block 124 denotes the end of the flow chart.
  • FIG 4 is a block schematic diagram of a secondary station.
  • the secondary station comprises an antenna 52 which is coupled to a receiver 54 in which it is frequency down converted using a frequency provided by a local oscillator 56.
  • the intermediate frequency signal is applied to a decoder 58 which in turn is coupled to a processor 60 which operates in accordance with a program stored in a program store 62.
  • the processor 60 includes means for identifying the address in a received signal and if the signal is not addressed to that secondary station the processor switches off the receiver 54 for a determined time period.
  • a location register 64 may be coupled to the processor 60 in order to store information regarding the zone in which the secondary station is located or currently located in the case of a transportable secondary station.
  • a display device such as a LCD panel 68, is coupled by way of appropriate drivers 70 to an associated output of the processor.
  • a keypad 72 is coupled to the processor 60 and constitutes a man/machine interface. Annunciating devices comprising one or more of an acoustic device 74, a LED 76 and a vibrator 78, are coupled to the processor 60. A user actuating the keypad 72 can cause an acknowledgement, registration or simple response signal to be generated as a spread spectrum sequence which is applied to a modulator 80 which provides a modulated signal to a transmitter 89, which is coupled to the antenna 52.
  • the oscillator signal for the transmitter is derived from the local oscillator 56.
  • the local oscillator 56 is a tunable oscillator in response to a frequency select signal provided by a frequency select stage 84 controlled by the processor 60.
  • FIG. 5 shows a suitable signal structure which may be used in the transmission system made in accordance with the present invention.
  • the structure is based on a repetitive period termed a cycle and in the example being described a cycle has a duration of 6.8 seconds.
  • Each cycle commences with a cycle information field 86 which contains the following items of information: zone identification, if the cycle is an answerback cycle, the bit rate being used to send the message proper, channel information and system messages.
  • zone identification if the cycle is an answerback cycle
  • the bit rate has an influence on the number of cells constituting a zone and as a general rule higher bit rate signals can only be used in zones comprising a single cell having a single base station whereas lower bit rate signals may be used in zones comprising a plurality of cells having primary stations operating in a quasi-synchronous mode.
  • bit rate is chosen by the system controller accord ing to the coverage/capacity/performance required in a given zone.
  • the secondary stations have the ability to decode signals at any of the predetermined bit rates used.
  • Figure 5 also indicates the presence of a message M commencing with an address code word ACW which is concatenated with a plurality of data code words DCW1 , DCW2 ... DCWn, where n is an integer.
  • Figure 6 illustrates an example of cycle allocation when a time division protocol is being followed.
  • the vertical broken lines indicate the boundaries between the cycles C1 ... C20.
  • the activity within each of the zones Z1 , Z2 and Z3 is indicated by the relevant trace being high thus for example zone Z1 is active for the period represented by cycles C1 to C4 and C1 6 to C1 8.
  • zone Z2 the cycles C5 to C7 and C1 9 and C20 are active.
  • zone Z3 is active for the period represented by the cycles C8 to C1 2.
  • the activity periods of the zones is not equal from zone to zone and as will be explained the cycles are allocated dynamically to reflect the level of radio traffic in the respective zones.
  • Cycles C1 3, C14 and C1 5 have been shown cross-hatched and represent those cycles indicated by the system controller in the cycle information field as being answerback cycles in which the secondary stations can transmit acknowledgements, registration signals and/or responses as low bit rate spread spectrum signals.
  • the time allocated to each zone is always an integral number of 6.8 second cycles.
  • the allocation of cycles may be applied to a multiplicity of zones which are separated by at least the re-use factor of the system.
  • Cells defined by primary stations are allocated dynamically to zones and cycles by the system controller. Zones are distinguished by a colour code, contained within the cycle information field 86 ( Figure 5) and the colour codes may be reused in zones separated by at least the re-use factor.
  • a secondary station need only listen to a single cell at any given time.
  • the cycle information field gives the number of cycles remaining for which the cell will be active (including the current one) and the minimum number of cycles for which the cell will be inactive. This allows the secondary stations listening to a given cell to switch off for a large part of the inactive periods thus economising on battery power. If a system-wide quasi-synchronous telescript transmission is required at any time, a special colour code is used to indicate this mode. This is also useful for allocating a cycle consisting only of answerback opportunities in all cells simultaneously.
  • each of the zones is constituted by one or a multiplicity of two or more cells operating in a quasi-synchronous mode. Quasi-synchronous operation automatically confirms that the bit rates used in the zones lie in the low to medium part of the range because, as indicated earlier, at higher bit rates each zone is constituted by a single cell.
  • zone Z2 becomes relatively busy then initially the system controller uses a higher bit rate when encoding the data messages which are to be transmitted by the primary stations PS2A, PS2B and PS2C this being indicated by the relevant field in the cycle information field. If the demand to relay messages cannot be fulfilled then in order to be able to operate at yet a higher bit rate it is necessary to subdivide the zone Z2 into three single cell zones Z2A, Z2B and Z2C. This not only enables the bit rate in the single cell zones to be increased but also for the number of cycles allocated to the zone Z2 to be reallocated to the newly created zones.
  • the system controller can relieve the zones Z1 and Z3 of cycle periods and allocate them as appropriate to the single cell zones. If the demand for capacity reduces in one of the single cell zones then initially it can reduce its bit rate however if the demand diminishes further then for example it may be able to relinquish a cycle period, or merge with the cells of another zone say in the case of the cell C6 that this merges into zone Z3 the bit rate in which may be increased and/or it being allocated more cycles.
  • a plurality of radio frequency channels F1 to F8 are allocated or re ⁇ allocated dynamically as indicated by the arrow, to the zones Z1 , Z2 and Z3 in accordance with their need.
  • the other option is to use a combination of time division and frequency division allocation of capacity to zones.
  • a further option is to dynamically allocate system capacity on a code division multiple access basis.

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

Abstract

Un système de télécommunications comporte une unité de commande de système (SC) et plusieurs stations primaires (PSI1...PS3C) délimitant des cellules, une ou plusieurs d'entre elles constituant une zone (Z1, Z2, Z3). Les stations primaires comprennent des organes de transmission de signaux. Il existe également plusieurs stations secondaires (SS1, SS2) dont une, pour le moins, est en mesure de se déplacer dans lesdites zones. L'unité de commande de système attribue, de façon dynamique, la capacité du système entre les zones afin de faire correspondre la capacité à l'utilisation courante du système. Cette attribution de capacité peut se faire selon un certain nombre de critères, par exemple une répartition dans le temps, une répartition en fréquence, une combinaison de ces deux principes, un regroupement des cellules de manière à modifier les dimensions géographiques des zones ou selon un accès multiple par division de code.
PCT/IB1996/000328 1995-05-25 1996-04-15 Attribution dynamique de capacite dans un systeme de telecommunications WO1996038013A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9510619.1 1995-05-25
GBGB9510619.1A GB9510619D0 (en) 1995-05-25 1995-05-25 Telecommunications system

Publications (1)

Publication Number Publication Date
WO1996038013A1 true WO1996038013A1 (fr) 1996-11-28

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WO (1) WO1996038013A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998028937A1 (fr) * 1996-12-23 1998-07-02 Telefonaktiebolaget Lm Ericsson (Publ) Gestion de la zone de localisation
WO1998052378A3 (fr) * 1997-05-14 1999-02-18 Nokia Telecommunications Oy Procede pour estimer les besoins en capacite des differentes parties d'un systeme de radiotelephonie cellulaire
WO2000024163A1 (fr) * 1998-10-16 2000-04-27 Telefonaktiebolaget Lm Ericsson (Publ) Capacite de trafic a commutation par paquets de cellule
GB2403375A (en) * 2003-06-24 2004-12-29 Nokia Corp Time slicing between adjacent cells in a wireless communication network

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759051A (en) * 1987-03-16 1988-07-19 A. A. Hopeman, III Communications system
WO1994011961A1 (fr) * 1992-11-13 1994-05-26 Telia Ab Procede et agencement d'attribution dynamique de voies a ondes porteuses mutilples destines a l'acces multiple par multiplexage par repartition en frequence
EP0637895A2 (fr) * 1993-08-02 1995-02-08 Motorola, Inc. Réallocation dynamique de la capacité spectrale dans des systèmes de communication cellulaires
EP0685973A2 (fr) * 1994-06-03 1995-12-06 AT&T Corp. Allocation de portes radio dans un système de communication cellulaire mobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759051A (en) * 1987-03-16 1988-07-19 A. A. Hopeman, III Communications system
WO1994011961A1 (fr) * 1992-11-13 1994-05-26 Telia Ab Procede et agencement d'attribution dynamique de voies a ondes porteuses mutilples destines a l'acces multiple par multiplexage par repartition en frequence
EP0637895A2 (fr) * 1993-08-02 1995-02-08 Motorola, Inc. Réallocation dynamique de la capacité spectrale dans des systèmes de communication cellulaires
EP0685973A2 (fr) * 1994-06-03 1995-12-06 AT&T Corp. Allocation de portes radio dans un système de communication cellulaire mobile

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998028937A1 (fr) * 1996-12-23 1998-07-02 Telefonaktiebolaget Lm Ericsson (Publ) Gestion de la zone de localisation
US6112097A (en) * 1996-12-23 2000-08-29 Telefonaktiebolaget Lm Ericsson Location area management
WO1998052378A3 (fr) * 1997-05-14 1999-02-18 Nokia Telecommunications Oy Procede pour estimer les besoins en capacite des differentes parties d'un systeme de radiotelephonie cellulaire
US6487413B1 (en) 1997-05-14 2002-11-26 Nokia Networks Oy Method of estimating the need of capacity for different parts of a cellular radio system
WO2000024163A1 (fr) * 1998-10-16 2000-04-27 Telefonaktiebolaget Lm Ericsson (Publ) Capacite de trafic a commutation par paquets de cellule
GB2403375A (en) * 2003-06-24 2004-12-29 Nokia Corp Time slicing between adjacent cells in a wireless communication network
US7315532B2 (en) 2003-06-24 2008-01-01 Nokia Corporation Time-divided transmission between adjacent cells

Also Published As

Publication number Publication date
GB9510619D0 (en) 1995-07-19

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