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WO1999009670A1 - Procede et disposif pour la mise a disposition de valeurs de frequences porteuses utiles destinees a des applications en radiotelephonie mobile - Google Patents

Procede et disposif pour la mise a disposition de valeurs de frequences porteuses utiles destinees a des applications en radiotelephonie mobile Download PDF

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Publication number
WO1999009670A1
WO1999009670A1 PCT/DE1997/001747 DE9701747W WO9909670A1 WO 1999009670 A1 WO1999009670 A1 WO 1999009670A1 DE 9701747 W DE9701747 W DE 9701747W WO 9909670 A1 WO9909670 A1 WO 9909670A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier frequency
frequency value
blocked
values
released
Prior art date
Application number
PCT/DE1997/001747
Other languages
German (de)
English (en)
Inventor
Jürgen KOCKMANN
Uwe Sydon
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/DE1997/001747 priority Critical patent/WO1999009670A1/fr
Publication of WO1999009670A1 publication Critical patent/WO1999009670A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7143—Arrangements for generation of hop patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H04B2001/7154—Interference-related aspects with means for preventing interference

Definitions

  • the present invention relates to a method and a device for providing effectively usable carrier frequency values for mobile radio applications.
  • the invention further relates to a base station and a mobile radio system which has a device of the type mentioned.
  • the so-called frequency hopping spread spectrum system is known as a method for transmitting data on a plurality of carrier frequencies.
  • a frequency hopping spread spectrum system is to be understood as a system in which a plurality of carrier frequencies are provided for the radio transmission of data and the carrier frequency currently used is changed at periodic intervals.
  • the carrier frequency can be changed after each time slot or time frame of the time division multiplex transmission.
  • TDMA time division multiplex
  • Such a frequency hopping spread spectrum system has advantages in that the energy of the entire radio transmission is distributed over all carrier frequencies. This is particularly important if a generally available frequency band, such as the 2.4 GHz ISM (Industrial, Scientific, Medical) band, is used.
  • a generally available frequency band such as the 2.4 GHz ISM (Industrial, Scientific, Medical) band, is used.
  • ISM Industrial, Scientific, Medical
  • Carrier frequency occurring energy set to keep interference from other participants as low as possible.
  • Frequency change it is stipulated that at least 75 different frequencies must be used within a period of 30 seconds. Furthermore, each frequency may be used for a maximum of 0.4 seconds in 30 seconds. In the time All frequencies must be used equally on average.
  • Another advantage of the frequency hopping spread spectrum system is that by providing a large number of carrier frequencies, the system becomes less sensitive to interference. The system's security against eavesdropping is also increased, as the third party usually does not know which carrier frequency is to be changed after a certain period of time.
  • the sequence of carrier frequencies that are used for transmission in succession is determined by an algorithm.
  • Such an algorithm is implemented in an identical manner in the base station and in each mobile station of the mobile radio transmission. If a handset is thus synchronized with the associated base station, the handset and the base station will synchronously carry out the carrier frequency changes specified by the sequence of the algorithm.
  • a method for providing usable carrier frequency values fx for mobile radio applications is provided for this purpose.
  • a predetermined number N of carrier frequency values fx that are possible in principle is provided.
  • At least one of the possible carrier frequency values fx can be blocked, so that the number of actually usable carrier frequency values fx is reduced to a number m ⁇ N.
  • the number m of actually usable carrier frequency values fx are written in a table in the addresses 1 to m.
  • the blocked carrier frequency values fx are written into the addresses (m + 1) to N.
  • blocking is intended to mean that a certain carrier frequency should not be used for a certain period of time for some reason, for example because it was detected as being disturbed.
  • a random number generator can generate m different values, which are then each converted into the carrier frequency values fx, which are available at the respective address equal to the values generated by the random number generator.
  • the carrier frequency value to be blocked can be exchanged with the carrier frequency value of the address M and M can then be decremented by 1.
  • the carrier frequency value to be blocked can be exchanged with the carrier frequency value to be released.
  • the carrier frequency value to be released can be exchanged with the carrier frequency value of the address M + 1 and M can then be incremented by 1.
  • a device for providing usable carrier frequency values fx for mobile radio applications has a table in which actually usable carrier frequency values are written in the addresses 1 to M.
  • the number of carrier frequency values that can actually be used is equal to M.
  • carrier frequency values that cannot be used are written into the addresses M + 1 to N, where N is the number of carrier frequencies available overall.
  • a random number generator can be provided which generates M different values. For this purpose, the current value of M is transmitted to the random number generator.
  • a table control can be provided which, when a carrier frequency value is blocked, exchanges the carrier frequency value to be blocked with the carrier frequency value of the address M and decrements M by 1.
  • the table controller can replace the carrier frequency value to be blocked with the carrier frequency value to be released if a carrier frequency value is blocked and another carrier frequency value is simultaneously released.
  • the table controller can exchange the carrier frequency value to be released with the carrier frequency value of the address M + 1 and increment M by 1.
  • a base station for mobile radio applications which has a device for providing usable carrier frequencies of the type mentioned above.
  • a mobile radio system which consists of a base station and at least one mobile part, the mobile radio system having a base station of the type mentioned above.
  • FIG. 1 shows a mobile radio transmission system with a fixed station according to the invention
  • FIG. 3 shows in detail the internal structure of a base station according to the invention
  • FIG. 4 shows a schematic illustration of a frequency-hoping spread spectrum system, in particular also in the case of a jammer avoidance mode
  • 5 to 8 show a schematic representation of the provision of carrier frequencies according to the invention in a table.
  • the arrangement for radio transmission of data has a base station 1 and several mobile parts (mobile stations), wireless telephones 2, 3 ....
  • the base station 1 is connected to the fixed network by a terminal line 10.
  • An interface device which is not shown, can be provided for communication between the base station 1 and the terminal line 10.
  • the base station 1 has an antenna 6, by means of which communication with the mobile part 3 takes place, for example, via a first radio transmission path 8 with the mobile part 2 or via a second radio transmission path 9.
  • the handsets 2, 3 ... each have an antenna 7 for receiving or transmitting data.
  • 1 schematically shows the state in which the base station 1 is actively communicating with the mobile part 2 and thus data is being transmitted. swaps.
  • base station 1 The internal structure of base station 1 is shown schematically in FIG. 1.
  • the voice information data are supplied to an RF module 4, which is controlled by a carrier frequency sequence unit.
  • RF module 4 which is controlled by a carrier frequency sequence unit.
  • the exact structure of a base station 1 according to the invention will be described later.
  • data are transmitted successively in a plurality of time slots, in the illustrated case 24 time slots Zx, on a plurality of carrier frequencies fx, ten of which are shown, in a time division multiplex method TDMA (Time Division Multiple Access).
  • TDMA Time Division Multiple Access
  • work is carried out in alternating mode (duplex), i. that is, after the first twelve time slots Zx have been transmitted, the system switches to reception and the second twelve time slots (Z13 to Z24) are received in the opposite direction by the base station.
  • the time duration of a time frame is 10 ms, and 24 time slots Zx are provided, namely twelve time slots for the transmission from the base station to handsets and a further twelve time slots Zx for transmission from the handsets to the base station.
  • ten carrier frequencies fx between 1.88 GHz and 1.90 GHz are provided.
  • other frame structures are also suitable for use in the present invention, such as those in which the number of time slots per frame is halved compared to the DECT standard.
  • the present invention is used in particular for transmissions in the so-called 2.4 GHz ISM (Industrial, Scientific, Medical) frequency band.
  • the generally accessible ISM frequency band has a bandwidth of 83.5 MHz. At least 75 carrier frequencies must be distributed over this 83.5 MHz in accordance with the "FCC part 15" regulation. A division of the bandwidth from 83.5 MHz to 96 carrier frequencies, ie a channel spacing of 864 kHz, is particularly advantageous.
  • the above-mentioned frequency bands and standards are given purely by way of example
  • the basic prerequisite for applicability in the present invention is only that a so-called frequency hopping spread spectrum is used, ie that several carrier frequencies are available, and that the carrier frequency chosen for transmission from time to time
  • the prerequisite for such a change is that the data is transmitted in time slots Zx (time division multiplex method), for example the DECT standard and any other modified standard based on this DECT standard are suitable.
  • the RF module 4 is supplied with information data if the base station 1 is to transmit to a mobile part 2, 3... By means of the antenna 6 and information data is output from the RF module 4 if data received by handsets.
  • the RF module 4 modulates the digitally coded information data onto a carrier frequency fx.
  • the carrier frequency fx currently to be used is predetermined by a carrier frequency sequence unit, which is generally designated 20.
  • a detection device 24 is provided in the carrier frequency sequence unit 20 the demodulated signal is supplied by the RF module 4. Interference means that there is either a disturbance in the actual sense or an assignment by another transmitter.
  • a disturbance in the sense of the present description can thus be detected by demodulating a received signal on a carrier frequency and by detecting whether or not there is a signal level on this carrier frequency.
  • a disturbed carrier frequency is therefore a carrier frequency onto which a signal is modulated that exceeds a certain threshold value.
  • the A-CRC value, the X-CRC value, a loss of synchronization or the RSSI value can be used for blocking.
  • the detection device 24 determines, for example on the basis of the demodulated signal from the RF module 4, how high the signal component modulated onto a specific carrier frequency fx is. If the detected signal component is above a predetermined limit value, the detection device 24 sends a fault detection signal to a blocking / release unit 21. Depending on the interference detection signal from the detection device 24, the blocking / release unit 21 gives a blocking / release information to a processor 23. This blocking / release information indicates which of the carrier frequencies fx are blocked or released again due to the detection of a fault by the detection device 24, as will be explained later.
  • the processor 23 is supplied with a sequence from a random generator 22. On the basis of a random algorithm implied in the random generator 22 generates a randomly distributed sequence of carrier frequency values. within the usable frequency band. The random generator 22 thus executes a procedure which is independent of the procedure for frequency blocking in the event of a fault. The processor 23 finally sends a control signal to the RF module 4, which specifies the carrier frequency value to be used for the RF module 4.
  • the processor 23 has a table 25 provided in a memory, the function and management of which will be explained later.
  • a carrier frequency fl is used, for example, during a frame Rx of a mobile radio transmission, as is shown hatched in FIG. 4.
  • This frequency fl is thus the first value of the sequence generated by the random generator 22, which is fed to the processor 23, which in turn controls the RF module 4 accordingly.
  • the random generator 22 prescribes a frequency jump Pl to a carrier frequency f3 on the basis of its calculated frequency.
  • the detection device 24 has detected, for example during a previous transmission, that the carrier frequency f 2 is disturbed, and the detection device 24 has therefore given a corresponding interference signal to the blocking / releasing unit 21, which in turn blocks the signal the frequency f2 which has indicated to the processor 23. Furthermore, it is assumed that the random generator 22 prescribes the carrier frequency f2 previously detected as disturbed for the frame R3 based on its determined sequence.
  • the processor 23 On the basis of the coincidence of the prescribed carrier frequency f2 in accordance with the sequence of the random generator 22 and at the same time the blocking signal from the blocking / release unit 21 for the same carrier frequency f2, the processor 23 now replaces the carrier frequency f2 for the frame R3 which is actually prescribed but is detected as being disturbed by a from the detection device 24 as Carrier frequency detected without interference, for example carrier frequency f4, as indicated by frequency hopping arrow P3. Instead of the carrier frequency 2 actually prescribed by the sequence, the RF module 4 is therefore driven to the substitute carrier frequency f4. By replacing the carrier frequency detected as disturbed, a modified sequence of carrier frequencies is created. The modified sequence only has undisturbed carrier frequencies. The fact that a carrier frequency detected as disturbed is replaced and is not skipped by a transition to the following carrier frequency means that the positions of the undisturbed carrier frequencies m of the modified sequence are not changed compared to the original sequence.
  • This blocking can be released by the blocking / releasing unit 21 as soon as a new detection by the detection device 24 indicates that the previously disturbed carrier frequency is no longer disturbed.
  • the blocking / releasing unit 21 issues a release signal to the processor 23, which indicates that the processor 23 no longer has to replace the previously disturbed carrier frequency by another carrier frequency.
  • the blocking / release unit 21 can automatically output a release signal to the processor 23 without a renewed detection by the detection device 24 as soon as a predetermined time period has expired.
  • Each of the procedures mentioned thus ensures that the entire predetermined frequency spectrum is used in an evenly distributed manner. By adjusting the times in the procedure for blocking frequencies, standards can thus be met.
  • Frequency hopping spread spectrum systems must use at least 75 different frequencies within a period of 30 seconds. Each frequency can be used for a maximum of 0.4 seconds in 30 seconds. In addition, on average, all frequencies must be used equally.
  • Base station 1 is the master in frequency allocation, i.e. H. at the beginning of a connection establishment, the random number generator is initialized in a mobile part with the state of the random number generator 22 of the fixed station 1.
  • the random number generators in the mobile part 2, 3 ... and in the base station 1 then generate the same carrier frequency values synchronously in the frame rate and independently of one another.
  • the procedure for frequency blocking which is carried out by the detection device 24 and the blocking / releasing unit 21, uses a unidirectional protocol on the air interface during the entire connection time between the base station 1 and a mobile part 2, 3. If the detection device 24 finds one of the final possible frequencies fx as disturbed by the base station 1, the base station 1 thus informs all the mobile parts with which it operates active connections that this disturbed frequency, if by the frequency of the random number generator is to be replaced by another carrier frequency that is not detected as being disturbed. The frequency blocking is withdrawn again by the blocking / release unit 21 when the blocked carrier frequency is again suitable for transmission or when it was blocked for longer than a previously defined time.
  • FIG. 3 it can be seen that a table 25, for example provided in a memory, is assigned to the processor 23.
  • FIGS. 5 to 8 it will now be explained how, according to the invention, the actually usable carrier frequencies fx, that is to say the carrier frequencies fx, which are not currently blocked, are provided. As in 5, all the available carrier frequencies fx, for example 96, are entered in a table 25.
  • 96 frequencies f1 to f96 are entered under the corresponding address in table 25.
  • the number of total carrier frequencies fx, 96 in the present case, is denoted by N.
  • Certain carrier frequencies of the 96 carrier frequencies fx will be blocked for a certain period of time. Since, according to the US regulation "FCC part 15", as already explained above, at least 75 different frequencies must be used in a period of 30 seconds, with a total of 96 carrier frequencies present, a maximum of 21 carrier frequencies may be blocked over a longer period
  • M The number of the carrier frequencies fx that are actually available, that is to say the unlocked carrier frequencies
  • the processor 23 therefore sends information to the random number generator 22 in order to transmit to it the number M of the actually available and unlocked carrier frequencies, for example the value M is updated in every frame - Siert and transmitted to the random number generator 22.
  • the table contains N addresses, each of which contains a possible frequency value fx. Each frequency value fx occurs only once in the table.
  • the frequency f3 was simply written in the place of the previous address of the frequency f94 to be blocked, ie at the address 94, and at the same time the address f94 to be blocked under the previous address of the carrier frequency f3 to be released (address 96). registered.
  • the position of the pointer and thus M is not changed in such a process.
  • FIGS. 8a and 8b it will now be explained how a blocked carrier frequency can be released again.
  • the initial state of the frequency lock is as shown in Fig. 8a.
  • FIG. 8a As can be seen from a comparison of FIG. 8a with FIG. 8b, when a blocked carrier frequency is released, the register content of the address behind the pointer is exchanged with the register content of the frequency to be released and then the pointer and thus M are incremented by 1.
  • the carrier frequency f95 which in the initial state is entered behind the pointer in the table and is therefore blocked, should be released.
  • the frequency f95 m to be released is written in the address M + 1 and thus behind the pointer. In the present case, this is the address 94.
  • the previous register content of the address 94 namely the carrier frequency f94, is written to the address 95 of the carrier frequency f95 to be released.
  • the pointer and thus M are incremented by +1. The state of FIG. 8b is thus reached
  • the invention can thus ensure that the number of actually available (not blocked) carrier frequency values can be used effectively and evenly.

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

Abstract

L'invention concerne un procédé et un dispositif pour la mise à disposition de valeurs de fréquences porteuses (fx) utiles destinées à des applications en radiotéléphonie mobile. Dans une table (25), des valeurs de fréquences porteuses effectivement utiles sont écrites à des adresses (1 à M), le nombre de ces valeurs de fréquences porteuses effectivement utiles étant égal à M. Les valeurs de fréquences porteuses non utiles actuellement sont écrites aux adresses M+1 à N, N représentant le nombre de toutes les fréquences porteuses (fx) étant à disposition. La valeur actuelle de M est amenée en continue, par exemple dans un intervalle de temps, à un générateur de nombres aléatoires (22) qui produit des séquences qui contiennent M différentes valeurs. La commande et l'administration de la table (25) et du générateur de nombres aléatoires (22) sont effectuées par un processeur (23).
PCT/DE1997/001747 1997-08-14 1997-08-14 Procede et disposif pour la mise a disposition de valeurs de frequences porteuses utiles destinees a des applications en radiotelephonie mobile WO1999009670A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE1997/001747 WO1999009670A1 (fr) 1997-08-14 1997-08-14 Procede et disposif pour la mise a disposition de valeurs de frequences porteuses utiles destinees a des applications en radiotelephonie mobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1997/001747 WO1999009670A1 (fr) 1997-08-14 1997-08-14 Procede et disposif pour la mise a disposition de valeurs de frequences porteuses utiles destinees a des applications en radiotelephonie mobile

Publications (1)

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WO1999009670A1 true WO1999009670A1 (fr) 1999-02-25

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415032A1 (de) * 1983-04-27 1984-11-08 Siemens AG, 1000 Berlin und 8000 München Verfahren zur stoerresistenten funkuebertragung
US5235613A (en) * 1992-03-02 1993-08-10 The Boeing Company Frequency hopping method and apparatus
EP0621707A2 (fr) * 1993-04-22 1994-10-26 International Business Machines Corporation Attribution et contrôle de modèles de sauts de fréquence dans des réseaux radio multiples autonomes arrangés
WO1996035265A1 (fr) * 1995-05-04 1996-11-07 Interwave Communications Reseau de communication par etalement du spectre a souplesse d'adaptation en frequence

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415032A1 (de) * 1983-04-27 1984-11-08 Siemens AG, 1000 Berlin und 8000 München Verfahren zur stoerresistenten funkuebertragung
US5235613A (en) * 1992-03-02 1993-08-10 The Boeing Company Frequency hopping method and apparatus
EP0621707A2 (fr) * 1993-04-22 1994-10-26 International Business Machines Corporation Attribution et contrôle de modèles de sauts de fréquence dans des réseaux radio multiples autonomes arrangés
WO1996035265A1 (fr) * 1995-05-04 1996-11-07 Interwave Communications Reseau de communication par etalement du spectre a souplesse d'adaptation en frequence

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