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WO1997016940A1 - Itinerance dans un systeme de telecommunication - Google Patents

Itinerance dans un systeme de telecommunication Download PDF

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Publication number
WO1997016940A1
WO1997016940A1 PCT/IB1996/001160 IB9601160W WO9716940A1 WO 1997016940 A1 WO1997016940 A1 WO 1997016940A1 IB 9601160 W IB9601160 W IB 9601160W WO 9716940 A1 WO9716940 A1 WO 9716940A1
Authority
WO
WIPO (PCT)
Prior art keywords
channels
secondary station
network
message
channel
Prior art date
Application number
PCT/IB1996/001160
Other languages
English (en)
Inventor
Peter John Mabey
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.
Priority to BR9607567A priority Critical patent/BR9607567A/pt
Priority to EP96935198A priority patent/EP0807365A1/fr
Priority to JP9517191A priority patent/JPH10512431A/ja
Priority to KR1019970704587A priority patent/KR987001196A/ko
Priority to CZ972049A priority patent/CZ204997A3/cs
Priority to AU73266/96A priority patent/AU7326696A/en
Publication of WO1997016940A1 publication Critical patent/WO1997016940A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present invention relates to roaming in telecommunications systems, particularly but not exclusively, in digital paging systems.
  • a large radio coverage area is divided into a plurality of sub-areas and a subscriber can elect the or those sub-areas in which he/she wants to be paged, a charge being made for each sub-area. Accordingly a subscriber knows in advance in which sub-areas he/she is contactable when roaming.
  • an operator may be necessary for an operator to include some form of operator identifier in a paging signal so that a subscriber registered with one operator can distinguish a paging signal being addressed to his/her terminal from a signal being sent to a similarly addressed subscriber unit belonging to another system.
  • the transmission of an operator identity can also be used by a pager to distinguish between one network and another thus avoiding it listening to the wrong network thereby saving battery current.
  • a block of frequencies (or channels) has been allocated to paging with competing operators being allocated one or more channels from the block.
  • a terminal unit belonging to a subscriber who is roaming within the geographical area has to be able to detect the channel(s) assigned to an operator and select the or those channel(s) being applied in each area. Additionally if an operator is allocated an extra channel the terminal unit needs to be able to acquire the channel whenever appropriate.
  • An object of the present invention is to facilitate roaming by subscribers in the coverage area of a telecommunications system.
  • a telecommunications system comprising a plurality of geographically separated primary stations, each primary station defining a coverage area, a plurality of said primary stations being operated as a network, and at least one transportable secondary station, characterised in that each primary station is adapted to transmit an announce channels message containing information about the radio channels available on the network to which it belongs, and in that the secondary station has means for receiving the announce channels message and for selecting one of the channels indicated in said message.
  • a secondary station for use in a telecommunications system comprising a plurality of geographically separated primary stations being operated as a network, wherein each primary station is adapted to transmit an announce channels message containing information about the radio channels available on its network, the secondary station comprising signal receiving means, means for storing details about channels belonging to the network and means responsive to receiving the announce channels message for selecting details of at least one of the channels contained in the storing means and conditioning the secondary station accordingly.
  • Figure 1 is a block schematic diagram of an embodiment of a wide area digital paging system
  • Figure 2 illustrates an example of a cycle structure
  • Figure 3 illustrates an example of a Batch Zero Marker
  • Figure 4 illustrates an example of a roaming address code word
  • Figure 5 illustrates an example of a sub-address code word
  • Figure 6 illustrates an example of an announce channels message
  • Figure 7 illustrates an example of four phase-offset areas
  • Figure 8 is a table showing the phasing of three frequencies in adjacent areas
  • Figure 9 illustrates an example of phase-offsetting over a large number of areas
  • Figure 10 illustrates an example of five phase-offset areas operating on 4 channels.
  • FIG 11 illustrates the sequence of frequencies used in Figure 10.
  • the same reference numerals have been used to indicate corresponding features.
  • the paging system shown in Figure 1 comprises a paging system controller (PSC) 10 which is connected by landline links to respective geographically separated primary stations PS1, PS2 and PS3.
  • Each primary station comprises a transmitter which defines a respective coverage area CAR1 , CAR2 and CAR3, which may overlap one or more adjacent coverage areas.
  • the PSC10 may control the operation of the primary stations in any one of a number of ways, for example single frequency quasi-synchronous operation, single frequency time-division cellular operation or multi-frequency operation.
  • the same geographical area may be covered by two or more networks, each with its own operator who has a PSC and geographically distributed primary stations so arranged that the coverage areas due to the primary stations of one network are arranged differently from those of another network.
  • subscribers owning secondary stations SS1 , SS2 comprising for example digital pagers, are able to roam within a predetermined home area and be contactable by the primary station in that area.
  • the secondary station SS1 should be capable of operating in other coverage areas then it is necessary for this to be recorded in the PSC10.
  • the subscriber may want to be contactable in other geographical areas in which networks operated by other operators prevail.
  • Each operator may have one or more channels allocated to its system and may have its own operator identity and area code. Also the modes of operation may differ from one operator to another and each operator may be able to offer different grades of service, such as a standard, Iower bit rate of service and one or more higher speed standards.
  • the secondary station SS1 has been shown in block schematic form.
  • An antenna 12 is coupled to a receiver stage 14, the output of which is supplied to a decoder 16.
  • a microcontroller 18 is coupled by way of bidirectional links 19, 20 with the decoder 16.
  • the microcontroller 18 is operated in accordance with software held in a program store 22.
  • An address store 24 containing the address(es) given to the secondary station is coupled to the microcontroller 18.
  • a RAM 26 for storing data messages received from a primary station is coupled to the microcontroller 18.
  • the latter has an output coupled to a LCD driver 28 which in turn is coupled to a LCD panel 30.
  • a keypad 32 is coupled to the microcontroller to provide a man/machine interface.
  • An acoustic transducer 34 and a light emitter 36, such as a LED, are coupled to the microcontroller 18 which uses them as alerting devices and, additionally, the light emitter 36 may be used to forward optically messages stored in the RAM 26 to say a printer or a personal computer.
  • the receiver 14 is operated by the microcontroller 18 in accordance with a battery economising protocol and a battery economising stage 38 is coupled between the microcontroller 18 and the receiver 14.
  • a further memory 40 which may be part of the program memory 22, has a number of storage locations 42 to 52 for holding various data which has been written-in as part of the programming of the secondary station.
  • the location 42 holds channel information.
  • the location 44 stores Home Identity, that is Operator Identity and Area Code. This information is used by the secondary station to determine when it is in its own coverage area, say
  • Location 46 contains information relating to its Home Channel which is a pre-programmed channel. However roaming pagers in the same coverage area will have to select a channel dynamically.
  • Location 48 holds Operator Identities and associated Area Codes which are valid for the secondary station when it is roaming away from its home area. In certain cases, the secondary station will have one programmed Operator Identity. However an operator may wish to use multiple Operator Identities in order to increase addressing capacity.
  • Location 50 stores data relating to the decoding the Operator Identity and Area Code field contained in special code words such as a Batch Zero
  • Location 52 stores one or more channel scanning algorithms useable with different protocols.
  • Each cycle comprises a plurality of batches BO, B1 , B2, each batch comprises a synchronisation code word and a plurality of frames FO to F27 and each frame comprises a plurality of code word periods, say 6, 8, 12 or 16 code words depending on the bit rate.
  • the first code word in each batch is a synchronisation code word S and in the first batch B0 of a cycle, a code word called a Batch Zero Marker (BZM) is the first code word following the synchronisation code word.
  • BZM Batch Zero Marker
  • Figure 3 illustrates the format of a BZM which is a 32 bit code word.
  • Bit 1 comprises a one bit flag having a value 0 to indicate an address code word.
  • Bit 2 is a BZM flag which has a value 0 for a BZM and 1 for any other address code word.
  • Bits 3 to 15 are allocated to the Operator Identity (Al) and the Area Code (AC) of the paging network.
  • Bit 16 is used to indicate a cycle or batch mode of operation, with "0" being cycle mode.
  • Bit 17 indicates whether or not a Batch Zero Message follows, with "1" indicating no following
  • a Batch Zero Message is used for the transmission of system wide broadcast messages sent to all pagers on the network.
  • Bits 18 to 21 of the BZM constitute a SUM field comprising a 4-bit checksum on the information in message code words.
  • the SUM field comprises a 2 bit field indicating the number of repeats of a cycle and a 2 bit field indicating the repeat number.
  • the remaining eleven bits comprise a 10 bit CRC and a 1 bit parity bit.
  • a primary station PS transmits a sequence of messages which have been formatted and encoded to conform to the format shown in Figure 2.
  • the transmission begins with a short preamble P which is immediately followed by the first batch BO of the first cycle.
  • the receiver stage 14 ( Figure 1) of a secondary station SS is energised to receive preamble which is used to achieve bit synchronisation.
  • the preamble is followed by the first sync code word and this is followed by the BZM.
  • the Operator Identity (Al) and Area Code (AC) are followed by the Home Operator Identity and Home Area Code which have been pre-programmed into the secondary station. If they do correspond then the transmission is treated as a local transmission and the secondary station follows the prevailing battery economy protocol which normally requires at least the receiver stage 14 of the secondary station to be powered down until just prior to the commencement of a predetermined frame of a batch.
  • the receiver stage 14 of the secondary station is powered down at the end of the frame period and an alerting device is energised, if appropriate. Otherwise the receiver remains energised until the end of the message has been indicated, for example, by an address code word or end of message code word, and then one or more of the alerting devices 34, 36 is or are energised, if appropriate.
  • the secondary stations knows that it is outside its home area.
  • the primary station is also aware that it is transmitting to a roaming secondary station and in the predesignated frame it transmits a roaming address code word and a sub- address code word.
  • Figures 4 and 5 illustrate respectively one example of each type of code word, each of which is 32 bits long.
  • bit 1 is a flag having a value 0, indicating an address code word.
  • Bits 2 to 7 are roaming flags and by setting all the bits to "1", an indication is sent that a roaming message follows.
  • Bit 8 is reserved.
  • Bits 9 to 21 indicate the Home Operator Identity and Area Code with which the secondary station is associated.
  • Bits 22 to 31 are the CRC and bit 32 is the parity bit.
  • the sub-address code word ( Figure 5) begins with a flag having a value 1 indicating that it is a message code word, bits 2 to 17 comprise address bits corresponding to the secondary station's address. Bits 18 to 21 constitute a SUM field consisting of a 4 bit checksum on the information in the message code words. Bits 22 to 31 comprise a 10 bit CRC and bit 32 comprises a parity check bit.
  • the receiver stage 14 of a secondary station is energised for its predetermined frame and checks if the Home Operator Identity bits correspond to those stored in the secondary station and, if they do, it checks that the address in the sub-address code word corresponds to that given to the secondary station and, if so, it remains energised to receive a following message but otherwise it is de-energised at the end of its frame.
  • Calls to a single channel secondary station are transmitted on the pager's pre-programmed channel.
  • Calls to a multi-channel secondary station in the secondary station's home area are transmitted on the secondary station's home channel.
  • the method of channel selection makes use of an "Announce Channels" message which is transmitted intermittently on each channel belonging to the operator.
  • Figure 6 illustrates the Command Parameters in an "Announce Channels" message.
  • the message begins with parameter A which comprises Operator Identity and Area Code which correspond to the same information given in the BZM.
  • Parameter B gives the name given to the coverage (or paging) area.
  • Parameter P is a single digit which defines the cycle phase in the specified area, as will be described later. The digit may have the following values and meanings: 0 phase T 1 phase T +
  • Parameter D relates to the Transmission Off Period which is a number defining the transmission suspension period for the specified operator and area; viz
  • the secondary station shall use a pre-programmed value, or default value if none is programmed,
  • Parameter Q is an integer which defines the number of radio channels which are operational in the specified paging area and which are identified in a following list.
  • the "Announce Channels" message is normally transmitted in a Batch Zero Message and informs pagers about the radio channels available in a specified network in a specified paging area. Not infrequently channel information is given about the current area and the neighbouring areas.
  • the message contains a list of Q channels c currently available to visiting pagers in that area, that is channels c OI c, ... c Q .
  • Table 1 Channel Index Numbers Calculated From Address Code
  • the secondary station can be instructed to look at its least significant bit and if it is zero, it tunes the first of the two channels, and if it is one, it tunes to the second of the two channels.
  • the Announce Channels message shall be used by the network to provide information to the secondary stations about adjacent paging areas.
  • the secondary station may use this information to assist its channel scanning algorithm.
  • a roaming secondary station on entering an area, scans the channels looking for a channel of an acceptable quality. It checks the BZM to see if the Operator Identity and Area Code correspond to an operator identity and area code stored in the memory location 48 ( Figure 1). If a correspondence is found then the secondary station remains energised to receive the Announce Channels message and depending on the parameters in that message, the secondary station selects an appropriate channel and follows the battery economy protocol relating to the standard being propagated by that operator.
  • multi-channel secondary station should be capable of operating on non- phased and phased-offset networks.
  • a multi-channel secondary station needs to have the capability to scan for a new channel when the signal quality of its current channel degrades.
  • One possible method of determining the signal quality is to measure the bit error rate of, for example, the sync code word signals and when it exceeds a threshold value, a channel search is instituted.
  • a single channel or multi-channel secondary station may roam between networks or paging areas and will re-synchronise to a channel in each network or area that it encounters.
  • This mode of operation is suitable for roaming between networks or paging areas which do not provide contiguous coverage, or in situations where the scanning time of the secondary station can be kept short so that calls are not missed, and in situations where there is no ambiguity about which area a secondary station should listen to.
  • Figures 7 and 8 illustrate an example of a phase-offset network and the phasing of three frequencies in adjacent areas.
  • the phase-offset network comprises four areas AR1 , AR2, AR3 and AR4.
  • a primary station PAR1 in Area AR1 transmits on a frequency F1 in phase T and the phasing of the cycle is as shown in the top line of Figure 8.
  • a primary station PAR2 in area AR2 transmits on a frequency F2 in phase T+ which is offset by one batch period relative to the phase T as shown in the second line of Figure 8.
  • Primary stations PAR3 and PAR4 in non-contiguous areas AR3 and AR4 transmit on a frequency F3 in phase T++ which is offset by two batch periods relative to the phase T as shown in the bottom line of Figure 8.
  • the phasing provides soft handover between channels which enables a multi-channel secondary station to scan and synchronise onto a new channel before it has relinquished its current channel. In this way a secondary station can roam between the areas AR1 to AR4 and can remain constantly in communication. For roaming between many networks it is convenient to refer the phases to an absolute time reference, for example by using the GPS system.
  • the parameter P in the Announce In order to inform a roaming secondary station of the phase of a channel in a specified paging area, the parameter P in the Announce
  • a secondary station is not restricted to monitoring two alternative frequencies. For example see Figure 10. While a secondary station is in the middle of area AR5 it will receive only frequency F1 but can scan frequencies F2, F3, F4 as shown in Figure 11. If the secondary station is moving West
  • the secondary station when the secondary station is searching for active frequencies for a particular phase it can cope with any number of frequencies.
  • the secondary station When the secondary station has found active frequencies which may carry its calls, it need only monitor three frequencies.
  • the secondary stations can adapt to changing network configurations which gives the following benefits: a.
  • the secondary stations are distributed approximately evenly across the available channels in a paging area. This optimises the channel loading and therefore the grade of service.
  • the frequencies in an area can be changed, for example to overcome interference. (Note, this option is not applicable to secondary stations in a home area who have a pre-programmed home area frequency. However it is applicable in a home area when dynamic channel selection is used in the home area.
  • New frequencies can be added to a paging area to cope with increased traffic load. If desired, paging channels could be assigned to the busiest paging areas to match the traffic demand (dynamic channel allocation).
  • the secondary station calculates the new channel from the Announce Channels message.
  • New paging areas can be established. Existing secondary stations in service can use these new areas without having pre-programmed information about the channels in use.
  • the secondary stations receive the Announce Channels message, decodes it and memorises the data. When the secondary station next visits that area it is able to select the appropriate channel without first having to receive an Announce Channels message.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Un système de télécommunications, par exemple un système de radiomessagerie numérique de longue portée, comporte plusieurs stations primaires géographiquement distinctes (PS1, PS2, PS3), définissant chacune une zone de desserte (CAR1, CAR2, CAR3), commandées par un contrôleur de système (10) afin de fonctionner en tant que réseau de longue portée. Des unités d'abonné (SS1, SS2) sont en mesure de se déplacer d'une zone de desserte à une autre. Afin de renseigner une unité d'abonné en déplacement sur quel canal elle doit être syntonisée, les stations primaires (PS1, PS2, PS3) émettent de temps à autre des messages d'annonce de canaux sur l'ensemble du système donnant des détails sur les canaux disponibles. Les unités d'abonné sont dotées de moyens leur permettant de sélectionner l'un de ces canaux disponibles.
PCT/IB1996/001160 1995-11-03 1996-10-29 Itinerance dans un systeme de telecommunication WO1997016940A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BR9607567A BR9607567A (pt) 1995-11-03 1996-10-29 Sistema de telecomunicaçoes e estaçao secundária para o mesmo
EP96935198A EP0807365A1 (fr) 1995-11-03 1996-10-29 Itinerance dans un systeme de telecommunication
JP9517191A JPH10512431A (ja) 1995-11-03 1996-10-29 電気通信システムにおけるローミング
KR1019970704587A KR987001196A (ko) 1995-11-03 1996-10-29 통신 시스템에서의 로밍(Roaming in Telecommunications Systems)
CZ972049A CZ204997A3 (en) 1995-11-03 1996-10-29 Transitions within telecommunication systems
AU73266/96A AU7326696A (en) 1995-11-03 1996-10-29 Roaming in telecommunications systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9522581.9A GB9522581D0 (en) 1995-11-03 1995-11-03 Roaming in telecommunications systems
GB9522581.9 1995-11-03

Publications (1)

Publication Number Publication Date
WO1997016940A1 true WO1997016940A1 (fr) 1997-05-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1996/001160 WO1997016940A1 (fr) 1995-11-03 1996-10-29 Itinerance dans un systeme de telecommunication

Country Status (9)

Country Link
EP (1) EP0807365A1 (fr)
JP (1) JPH10512431A (fr)
KR (1) KR987001196A (fr)
CN (1) CN1176730A (fr)
AU (1) AU7326696A (fr)
BR (1) BR9607567A (fr)
CZ (1) CZ204997A3 (fr)
GB (1) GB9522581D0 (fr)
WO (1) WO1997016940A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998056206A1 (fr) * 1997-06-06 1998-12-10 Telefonaktiebolaget Lm Ericsson Procede permettant de reduire le delai d'etablissement d'un message aboutissant a un mobile dans un systeme de radiocommunication
EP1429481A2 (fr) * 2002-12-11 2004-06-16 Microsoft Corporation Découverte de la fréquence et traitement de basculement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914649A (en) * 1988-09-12 1990-04-03 Motorola, Inc. Multiple frequency message system
US5254986A (en) * 1989-10-23 1993-10-19 Motorola, Inc. Nation-wide paging with local modes of operation
WO1994008431A1 (fr) * 1992-09-25 1994-04-14 Motorola, Inc. Procede d'attribution de voies dans un environnement de voies a plusieurs debits
WO1996028898A1 (fr) * 1995-03-09 1996-09-19 Motorola Inc. Systeme et procede de messagerie a fonction de localisation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914649A (en) * 1988-09-12 1990-04-03 Motorola, Inc. Multiple frequency message system
US5254986A (en) * 1989-10-23 1993-10-19 Motorola, Inc. Nation-wide paging with local modes of operation
WO1994008431A1 (fr) * 1992-09-25 1994-04-14 Motorola, Inc. Procede d'attribution de voies dans un environnement de voies a plusieurs debits
WO1996028898A1 (fr) * 1995-03-09 1996-09-19 Motorola Inc. Systeme et procede de messagerie a fonction de localisation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998056206A1 (fr) * 1997-06-06 1998-12-10 Telefonaktiebolaget Lm Ericsson Procede permettant de reduire le delai d'etablissement d'un message aboutissant a un mobile dans un systeme de radiocommunication
US6434396B1 (en) 1997-06-06 2002-08-13 Telefonaktiebolaget L M Ericsson Method in a cellular radio communications system
EP1429481A2 (fr) * 2002-12-11 2004-06-16 Microsoft Corporation Découverte de la fréquence et traitement de basculement
EP1429481A3 (fr) * 2002-12-11 2004-08-11 Microsoft Corporation Découverte de la fréquence et traitement de basculement
US7043214B2 (en) 2002-12-11 2006-05-09 Microsoft Corporation Tower discovery and failover
US7403754B2 (en) * 2002-12-11 2008-07-22 Microsoft Corporation Tower discovery and failover

Also Published As

Publication number Publication date
CZ204997A3 (en) 1997-12-17
CN1176730A (zh) 1998-03-18
BR9607567A (pt) 1998-07-21
GB9522581D0 (en) 1996-01-03
KR987001196A (ko) 1998-04-30
JPH10512431A (ja) 1998-11-24
EP0807365A1 (fr) 1997-11-19
AU7326696A (en) 1997-05-22

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