WO1998033341A1 - Procede d'etablissement de voies montantes dans un reseau de radiomessagerie, ce reseau de radiomessagerie et terminal radio du reseau, pour la mise en oeuvre du procede - Google Patents
Procede d'etablissement de voies montantes dans un reseau de radiomessagerie, ce reseau de radiomessagerie et terminal radio du reseau, pour la mise en oeuvre du procede Download PDFInfo
- Publication number
- WO1998033341A1 WO1998033341A1 PCT/FR1998/000119 FR9800119W WO9833341A1 WO 1998033341 A1 WO1998033341 A1 WO 1998033341A1 FR 9800119 W FR9800119 W FR 9800119W WO 9833341 A1 WO9833341 A1 WO 9833341A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- terminals
- terminal
- radio
- network
- transmission
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/022—One-way selective calling networks, e.g. wide area paging
- H04W84/025—One-way selective calling networks, e.g. wide area paging with acknowledge back capability
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/18—Service support devices; Network management devices
- H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
Definitions
- a paging network includes base stations, each providing radio coverage, in downlink channels, of a specific area of the territory benefiting from the paging service.
- the person transmitting the message orally transmits it by telephone to an operator of a radio network operating center and the latter transmits by radio the characters forming the message as well as the identity number of the receiving terminal. Only the terminal with this identity accepts the message to display it on its screen.
- Such bidirectional communication therefore requires a downlink network and an uplink network, which is not very user-friendly and often results in a loss of time, to access a terminal of the telephone network, and an increased expense, often for providing only a response. 'an acknowledgment of receipt.
- the binary signals (bits) transmitted on the uplinks by the terminals must exceed the minimum threshold of energy sensitivity of the station.
- the energy of a bit transmitted by a terminal is proportional to the level, or power, of transmission and to the duration of this bit.
- the energy of the received bit corresponds to that of the transmitted bit, obviously reduced by the transmission attenuation, increasing with the required range.
- the minimum speed to be ensured thus limits the range of the uplink to a distance insufficient to ensure the connection with the station from any point in the downlink area that it covers. It is then necessary to plan to subdivide this descending zone into ascending sub-zones each comprising a receiving station. In existing networks, the calculation shows that a few dozen receiving stations would be required per zone. In short, the second network for uplink, or return, is prohibitively expensive.
- the present invention aims to reduce this second network, of uplink channels, used to transmit a response, or even spontaneously a message, to a receiving station.
- the invention relates first of all to a method for establishing uplinks in a paging network comprising at least one base station, for transmitting messages by radio broadcast to a plurality of radio transmitter-receiver terminals. , and at least one base station for radio reception of messages from the terminals, method characterized in that:
- a transmission frequency chosen from a determined group,. a transmission time interval, of a determined time frame, and
- the terminals are identified at the receiving station by their attributes.
- the invention also relates to a paging network comprising at least one base station for transmitting by radio broadcast to a plurality of radio transmitter-receiver terminals, and at least one base station for receiving radio messages from the terminals.
- the terminals each comprise transmitting means arranged to comply with attributes allocated to the terminal, comprising:
- a coding word to be transmitted, with the message, in said time interval, and the receiving station comprises:
- the invention relates to a paging terminal, comprising radio transmission-reception means for communicating with a base station of a paging network, characterized in that
- the radio means are arranged to be adjusted on a transmission frequency, chosen from a determined group,
- - Sequencing means controlled by the time base, are provided, arranged to read memory means containing a coding word allocated to the terminal, and to cooperate with the input means.
- FIG. 3 represents a time frame regulating the transmissions of the terminals
- FIG. 4 represents a coding word used during the transmission of a message by a terminal
- FIG. 5 is a block diagram of the terminal
- FIG. 6 is a block diagram of the receiving part of the station.
- Each of the N terminals 1, 2 is allocated a trilogy of attributes: frequency (fig. 2), time interval (fig. 3) and coding word
- FIG. 2 shows a group of eight determined frequencies fi (i: integer from 0 to 7) here provided.
- FIG. 3 illustrates, as a function of time t, two successive time frames T, here comprising only four time intervals ITO, IT1, IT2 and IT3, for the sake of clarity.
- Figure 5 is a block diagram of terminal 1.
- the attributes of terminal 1 are downloaded, which makes it possible to modify them if necessary and, moreover, avoids any manual adjustment.
- the receiver 11 supplies three memories 17, 18, 19 to store there the three attributes, respectively the frequency fi, the time interval ITj and the coding word CD.
- the validation of the above memorizations implements a memory circuit 20, containing an identity word specific to the terminal 1 considered here, in order to unlock a comparator-door control circuit 21.
- the circuit 21 allows access to the memories 17 to 19 when a received message address (11), associated with the attributes to be downloaded, corresponds to the identity of the terminal 1.
- the time base 12 receives from memory 18 the time interval number ITj allocated to the terminal 1 and, by reference to the successive T frames which it generates, it supplies clock signals H during only the time interval ITj assigned.
- a sequencer circuit 13 is then activated by the clock H to transmit an uplink message, by command of a radio transmitter 15.
- the memory 17 controls, therefore according to the allocated attribute, the frequency carrier of an adjustable oscillator 16 controlling the transmitter 15.
- the third attribute, coding word CD of the memory 19, is used to adjust the sequencer 13, as explained below.
- the sequencer 13 cooperates with a data entry keyboard 14, used to enter a response to a received message or even to transmit an uplink message, independently of any reception of a downlink message. In the case of a response, it can be a single bit of acknowledgment.
- the bits of a message sent by the terminal 1 are here transmitted by coding by means of a determined code word C, common here to all the N terminals 1, 2.
- the principle of this coding will be explained, before describing the corresponding circuits.
- Each bit of a message sent by the terminal 1 is sent in the form of the code word C here representing 2047 code moments. It will be recalled that a code moment, or Baud, corresponds to an elementary duration of modulation during which the latter remains unchanged.
- the transmitted signal keeps a constant level, or a constant phase or frequency, depending on the type of modulation.
- a transmitted bit is therefore here represented by a pattern C of elementary moments whose sequence of values is determined. Depending on whether the bit is 0 or 1, these values are inverted or not.
- the delay Rk introduces a logical phase shift of the code word C, by a certain number of periods of the clock H, delay Rk which is not the same for all the terminals 1, 2, although it may be common to several, if they differ in their two other attributes.
- the station 4 searches in each time interval ITj for the pattern C, or signature, above, in direct or complementary representation, with all the possible delays Rk.
- the pattern C has a length producing sufficient redundancy to successfully carry out such a search despite the overlaps that may occur between the emissions originating from several terminals 1, 2.
- the sequencer 13 comprises a set 131 of shift registers supplied by the clock H, providing the determined sequence C of 2047 pseudo-random bits used for coding the message. These registers 131 are associated with loopback gates like 132, here exclusive OR, which apply to an upstream input a logical combination of outputs downstream from the registers 131, in order to confer the pseudo-random character to the sequence C, which facilitates reception recognition.
- the sequence C of bits at the output of the registers 131 is applied to an exclusive OR gate 134, reading the state of the keyboard 14 through a buffer memory 135 written byte by byte, gate 134 which controls the transmitter 15.
- the memory 135 is read bit by bit every 2047 clock periods H, at each start of time interval ITj, that is to say that the bit read controls the inversion or not of the 2047 bits of the sequence C, as explained upper.
- a comparator 133 receives from the latter signals Qi representing the state of frequency dividers, advancing with the clock H from the start of each frame T, and, by comparison with the content of the memory 19, commands at the instant indicated by the latter (Rk) the parallel forcing of the registers 131 in a predetermined state, the even for all the terminals 1, 2.
- the sequence at the output of the registers 131 is therefore delayed by the specified number, or allocated to the terminal 1, by clock periods H corresponding to the delay Rk.
- C The sequence repeats itself and is therefore 'provided with a frame T constantly to the next, in the allotted time interval ITJ.
- a time base 40 supplies a clock signal H1, similar to the signal H, to a generator 42 of pseudo-random sequence, similar to the circuits 131, 132.
- the generator 42 serves as a time reference for fixing the offsets throughout the network of terminals, that is to say that the delays Rk are defined relative to its state.
- the time base 40 also generates the T frames and controls, by radio channels not shown downlink, the transmission of the frame synchronization signals from the terminals 1, 2.
- a circuit 432 with adjustable delay makes it possible to find the pattern C according to the various possible delays Rk.
- the circuit 432 supplies a circuit 434 for recognizing the patterns C received, direct and inverted, and for determining the delay Rk of each. The detection of the pattern C, direct or complemented moment by moment, provides the value of the message information bit M which it carries.
- a memory 46 contains a triple table comprising, for each terminal 1, 2 of the network, the three attributes which have been allocated to it: frequency fi, time interval ITj, coding word CD (here only Rk). It has three (groups of) read addressing entries for the three attributes above, respectively.
- the time base 40 applies to it time interval signals ITj, here 3 bits, to identify the eight time intervals.
- Each of eight circuits as 43 additionally applies to memory 46, when a recognition of a coding word C occurs, a value representing the detected delay Rk and a value representing the rank i of the circuit 43 considered, that is to say ie the frequency fi.
- each circuit as 43 controls, by one bit, a specific input, among eight inputs of increasing priority, of a priority encoder circuit 44 providing at output a three-bit code word representing the address or rank i of the input activated in addition high priority.
- 74,147 and 74,148 family circuits produced by TEXAS INSTRUMENTS INC. are suitable for this purpose.
- the circuit 44 controls a multiplexer circuit 45 with several output channels, reading the value Rk supplied by the channel (43) considered, to read the memory 46 in read mode.
- the following bits upon receipt of the following C patterns, are stored with the first to reconstruct the message.
- the network of uplink channels can be distinct from that of the downlink channels and that in particular the synchronization of the frames is carried out by a broadcast transmitter different from that of a paging station.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98903110A EP0954936A1 (fr) | 1997-01-24 | 1998-01-23 | Procede d'etablissement de voies montantes dans un reseau de radiomessagerie, ce reseau de radiomessagerie et terminal radio du reseau, pour la mise en oeuvre du procede |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR97/00748 | 1997-01-24 | ||
FR9700748A FR2758933B1 (fr) | 1997-01-24 | 1997-01-24 | Procede d'etablissement de voies montantes dans un reseau de radiomessagerie, ce reseau de radiomessagerie et terminal radio du reseau, pour la mise en oeuvre du procede |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998033341A1 true WO1998033341A1 (fr) | 1998-07-30 |
Family
ID=9502931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/000119 WO1998033341A1 (fr) | 1997-01-24 | 1998-01-23 | Procede d'etablissement de voies montantes dans un reseau de radiomessagerie, ce reseau de radiomessagerie et terminal radio du reseau, pour la mise en oeuvre du procede |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0954936A1 (fr) |
CN (1) | CN1249884A (fr) |
FR (1) | FR2758933B1 (fr) |
WO (1) | WO1998033341A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990015512A1 (fr) * | 1989-06-05 | 1990-12-13 | Motorola, Inc. | Systeme de teleappel accusant reception en retour et ayant la capacite d'assortir des messages de donnees de longueur variable a des adresses de dispositifs de teleappel |
EP0501717A2 (fr) * | 1991-02-25 | 1992-09-02 | Nec Corporation | Système d'appel bi-directionnel avec fonction de réponse |
WO1996000465A1 (fr) * | 1994-06-24 | 1996-01-04 | Wong Gabriel K Y | Procede et appareil d'appel de personnes |
-
1997
- 1997-01-24 FR FR9700748A patent/FR2758933B1/fr not_active Expired - Fee Related
-
1998
- 1998-01-23 WO PCT/FR1998/000119 patent/WO1998033341A1/fr not_active Application Discontinuation
- 1998-01-23 EP EP98903110A patent/EP0954936A1/fr not_active Withdrawn
- 1998-01-23 CN CN 98802974 patent/CN1249884A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990015512A1 (fr) * | 1989-06-05 | 1990-12-13 | Motorola, Inc. | Systeme de teleappel accusant reception en retour et ayant la capacite d'assortir des messages de donnees de longueur variable a des adresses de dispositifs de teleappel |
EP0501717A2 (fr) * | 1991-02-25 | 1992-09-02 | Nec Corporation | Système d'appel bi-directionnel avec fonction de réponse |
WO1996000465A1 (fr) * | 1994-06-24 | 1996-01-04 | Wong Gabriel K Y | Procede et appareil d'appel de personnes |
Also Published As
Publication number | Publication date |
---|---|
EP0954936A1 (fr) | 1999-11-10 |
FR2758933B1 (fr) | 1999-03-26 |
CN1249884A (zh) | 2000-04-05 |
FR2758933A1 (fr) | 1998-07-31 |
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