WO1999009667A1 - Procede et systeme de transmission pour la signalisation d'une frequence porteuse - Google Patents

Procede et systeme de transmission pour la signalisation d'une frequence porteuse Download PDF

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Publication number
WO1999009667A1
WO1999009667A1 PCT/DE1997/001732 DE9701732W WO9909667A1 WO 1999009667 A1 WO1999009667 A1 WO 1999009667A1 DE 9701732 W DE9701732 W DE 9701732W WO 9909667 A1 WO9909667 A1 WO 9909667A1
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WO
WIPO (PCT)
Prior art keywords
base station
multiframe
carrier frequency
bits
signaling
Prior art date
Application number
PCT/DE1997/001732
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 CA002300067A priority Critical patent/CA2300067A1/fr
Priority to PCT/DE1997/001732 priority patent/WO1999009667A1/fr
Publication of WO1999009667A1 publication Critical patent/WO1999009667A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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
    • H04B1/7156—Arrangements for sequence synchronisation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a method and a transmission system that enables signaling of a carrier frequency that is used at a predetermined time after the signaling.
  • the invention relates in particular to a method and a transmission system that enables the signaling of the frequencies of a so-called multiframe mode of a frequency hopping spread spectrum interface based on the DECT standard.
  • 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 understood to mean a system in which a large number of carrier frequencies are provided for radio transmission of data and the carrier frequency currently used is changed periodically.
  • the carrier frequency can be changed after each time slot or time frame of the time ultiplex transmission or an integer multiple thereof.
  • 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
  • FCC part 15 defined by the Federal Communications Commission
  • 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. In addition, the system is more secure against eavesdropping from third parties, since the third party generally 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 mobile unit is therefore synchronized with the associated base station with regard to the carrier frequencies, the mobile unit and the base station will synchronously carry out the carrier frequency changes specified by the sequence of the algorithm.
  • Idle locked mode or multiframe mode is an operating mode in which a handset is ready to receive but is connected to the base station without active communication.
  • a handset that is ready to receive in idle locked mode in a kind of standby state only resynchronizes its carrier frequencies according to m carrier frequencies, since every resynchronization requires a connection to the base station to receive at least one time slot and thus consumes energy.
  • the handset in idle locked mode which only resynchronizes to the base station in every m-th frame (multiframe frame), thus swaps between two successive multiframe frames during the remaining frames, ie during the first to (ml) th frame, no information from the base station.
  • the present invention is concerned with the problem of how to retain the structures of the
  • DECT standards can be used to signal carrier frequencies.
  • a method for digital signaling of a carrier frequency is provided according to the invention, which is to be used at a predetermined time after the signaling.
  • the signaling takes place from a base station to a mobile station and / or vice versa.
  • the signaling information is contained in the bits which correspond to header bits of the A field of the DECT standard. “Correspond” in the sense of the present description means that although not all features of the DECT standard have to be used in the invention, the structure of the A and D fields of the DECT standard are retained in any case should.
  • the time slot and frame structure of the DECT standard can be changed in terms of number and duration.
  • the carrier frequencies used can also be changed as desired. For example, a different frequency band can be used.
  • the above-mentioned method can be used for a so-called multiframe mode, in which a mobile station receives data from a base station only during so-called multiframe frames in order to be able to re-synchronize with the base station.
  • a multiframe frame is provided after every (m-1) frame of the transmission, "m” being an integer greater than 1.
  • the carrier frequency used by the base station in the next multiframe frame is transmitted to the mobile station during all the multiframe frames.
  • Frames preceding frames of the transmission signaled by bits, the bits of the header of the A field correspond to the DECT standard.
  • the carrier frequency can be signaled in particular in the Q1, 3BA and / or in the Q2 bit of the header of the A field.
  • the carrier frequency is signaled in all of the above-mentioned bits of the header of the A field, one of 32 different carrier frequencies can thus be signaled.
  • a multiframe frame can follow every 15 frames of transmission. During 15 frames of transmission, the mobile station is thus signaled which carrier frequency is used in the multiframe frame.
  • the carrier frequencies that are signaled can be stored in the base station and the mobile station in a table provided there.
  • a digital wireless transmission system with a fixed station and at least one mobile station is also provided.
  • the base station and the mobile station have devices for signaling from the base station to the mobile station and / or vice versa a carrier frequency which is to be used at a predetermined time after the signaling.
  • Bits are provided for signaling that correspond to header bits of the A field of the DECT standard.
  • a multiframe mode in which the mobile station receives data from the base station only during multiframe frames, in order to be able to resynchronize with the base station.
  • a multiframe frame is provided after every (m-1) frame of the transmission.
  • the carrier frequency used by the base station for the next multiframe frame is signaled to the mobile station in the bits corresponding to the bits of the header of the A field of the DECT standard.
  • the Q1, the 3 BA and / or the Q2 bit of the header of the A field can be provided for signaling the carrier frequency.
  • a multiframe frame can be provided after every 15 frames of transmission.
  • a table can be provided in the base station and the mobile station, in which the possible carrier frequencies are stored.
  • FIG. 1 shows a mobile radio transmission system with a base station according to the invention
  • base station shows in detail the internal structure of a base station according to the invention (base station),
  • FIG. 4 shows a schematic illustration of a frequency hopping spread spectrum system, in particular also in the case of a jammer avoidance mode, and 5a to 5e the structure of the DECT standard and in particular in FIG. 5e the content of the so-called header of the A field.
  • the arrangement for radio transmission of data has a base station 1 and several mobile parts (mobile stations, cordless 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, for example, via a first radio transmission path 8 with the mobile part 2 or via a second
  • Radio transmission path 9 communication with the handset 3 takes place.
  • the handsets 2, 3 ... each have an antenna 7 for receiving or transmitting data.
  • Fig. 1 the state is schematically shown in which the base station 1 actively communicates with the mobile part 2 and thus exchanges data.
  • the handset 3, on the other hand, is in the so-called idle locked mode, in which it waits stand-by for a call from the base station 1.
  • the mobile part 3 does not constantly communicate with the fixed station 1, but rather only receives the data, for example of a time slot, which are necessary for the re-synchronization of the carrier frequencies fx only at periodic time intervals.
  • 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.
  • a transmission standard as used in the present invention will now be explained with reference to FIG. can be applied.
  • 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), ie after the first twelve time slots Zx have been transmitted, reception is switched 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.
  • the present invention has particular application for
  • the generally accessible ISM frequency band has a bandwidth of 83.5 MHz.
  • 75 carrier frequencies fx must be distributed over this 83.5 MHz.
  • Frequency bands and standards are given purely as an example, and the basic requirement for applicability in the present invention is that a so-called frequency hopping spread spectrum is used, ie that several carrier frequencies are available and that the carrier frequency selected for transmission is changed periodically. For such a change, it is advantageous if the data are transmitted in time slots Zx (time division multiplex method).
  • time slots Zx time division multiplex method
  • 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.
  • the main components of the carrier frequency sequence unit 20 are a first calculation device, which is generally designated 25, and a second calculation device 26. Furthermore, a switching device 27 is provided. As shown, this switching device 27 is controlled by the processor 23 and selects whether the first calculation device 25 or the second calculation device 26 should specify the current value for the carrier frequency fx.
  • a detection device 24 is provided, to which the demodulated signal from the RF module 4 is supplied. Interference means that there is either a disturbance in the actual sense or an assignment by another transmitter. A fault in the sense of the present description can therefore be detected in that a received signal is demodulated on a carrier frequency and it is detected whether or not there is a signal level on this carrier frequency.
  • the detection device 24 uses the demodulated signal from the RF module 4 to determine how high the signal component modulated onto a specific carrier frequency fx or whether a burst or CRC error has occurred. If the detected signal component lies above a predetermined limit value or one of the abovementioned errors has occurred, the detection device 24 sends a fault detection signal to a blocking / releasing unit 21. Depending on the interference detection signal from the detection device 24, the blocking device / Release unit 21 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 number generator 22.
  • a random algorithm implied in the random generator 22 generates a randomly distributed sequence of carrier frequency values within the predetermined 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 second calculation device 26 is provided for implementing a second algorithm which is independent of the first algorithm implemented in the first calculation device 25. As can be seen, there is no possibility of frequency blocking in the second algorithm implemented in the second calculation device 26.
  • the second algorithm can be determined, for example, by the base station 1 when a mobile part is registered at the base station 1, so that after the registration no further information exchange between the base station and the mobile part is necessary with regard to this second algorithm.
  • the second calculation device 26 can generate the second algorithm, for example, by means of a random number generator contained in it.
  • a frequency table can also be provided in the second calculation device 26, which is processed sequentially by the second calculation device 26.
  • the carrier frequency values to be used for the carrier frequencies with the running arameter nxm are therefore provided in the frequency table, ie. H. in the event that the carrier frequency is changed after the duration of a frame, for every mth frame.
  • the frequency table can be derived, for example, from the PIN code number of the registered mobile part 2, as a result of which independent mobile radio systems, each consisting of a base station and at least one mobile part, use different tables.
  • the processor 23 outputs various information about these components.
  • the random number generator 22 receives, for example, the information about how many different values it should generate.
  • the processor 23 can also provide the random number generator 22 with a starting value for its algorithm. The handset receives this start value during synchronization, which can be achieved by the handset and base station using the same start value and the same algorithm.
  • the second calculation device 26 receives information from the processor 22 regarding the periodicity of the idle-locked mode, i.e. the value of m.
  • 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 number generator 22, which is fed to the processor 23, which in turn controls the RF module 4 accordingly.
  • the random number 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, that is to say the detection device 24 has given a corresponding interference signal to the blocking / releasing unit 21, which in turn blocks the Frequency f2 that the processor 23 has indicated. Furthermore, it is assumed that the random number generator 22 prescribes the carrier frequency f2 previously detected as disturbed for the frame R3 on the basis of its determined sequence.
  • processor 23 Starting from the coincidence of the prescribed carrier frequency f2 according to the sequence of the random number generator 22 and at the same time the blocking signal from the blocking / releasing unit 21 for the same Carrier frequency f2, processor 23 now replaces the carrier frequency f2 for the frame R3, which is actually prescribed but is detected as being disturbed, by a carrier frequency which is not detected by the detection device 24, for example the carrier frequency f4, as indicated by the frequency hopping arrow P3. Instead of the carrier frequency f2 actually prescribed by the sequence, the RF module 4 is thus 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 in the modified sequence are not changed compared to the original sequence.
  • the basis of this modified sequence consisting only of undisturbed carrier frequencies fx are therefore two superimposed, mutually independent procedures (random number generator 22 or blocking / releasing unit 21).
  • the first procedure includes random number generator 22, which generates values between 0 and N, where N is the number of possible carrier frequencies.
  • the second procedure blocks disturbed frequencies as explained above. This blocking can be released again 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. In this case, the blocking / release 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 previously certain period of time has expired.
  • Each of the procedures mentioned thus ensures that the entire predetermined frequency spectrum is used in an evenly distributed manner.
  • standards such as, for example, the US regulation "FCC part 15" can be adhered to, which impose upper limits for the energy emitted on a carrier frequency.
  • the random number generator 22 is constructed in a known manner and is therefore not further explained in the course of the present description. It is important, however, that the random generator is operated independently of the lock / release procedure. An identical random number generator is also implemented in each handset 2, 3.
  • Base station 1 is the master in frequency allocation, i. H. at the start 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 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 handset 2, 3. If the detection device 24 finds one of the n possible frequencies fx as disturbed by the fixed station 1, then it divides the
  • Base station 1 all handsets with which it operates connections with the fact that this disturbed frequency, if it is generated by the sequence of the random number generator, is to be replaced by another carrier frequency which is not detected as disturbed.
  • the random number generator 22 is not influenced by the frequency blocking. This frequency block is from the The blocking / release unit 21 is withdrawn again if the blocked carrier frequency is suitable for transmission again or if it was blocked for longer than a previously defined time.
  • a so-called multi-frame mode can be implemented in a particularly inexpensive and simple manner.
  • a multi-frame is m frames long, m can be 16, for example.
  • the value for the carrier frequency fx that is output by the algorithm of the second calculation device 26 and that is completely independent of the first algorithm that is implemented by the first calculation device 25 is used in every m-th frame (multiframe frame) is.
  • the first algorithm is used in the first calculation device 25.
  • the value of the second algorithm of the second calculation device 26 is then used for the carrier frequencies with the frame number nxm, which is symbolically represented in FIG. 3 by a switching device 27.
  • the MultiFrame a length of 16 frames are in the frame with the Numbers 1 to 15 determine the carrier frequencies by the first algorithm of the first calculation device 25, while in the multiframe frame with the number 16 the carrier frequency is determined by the second algorithm.
  • a mobile part that is in the multi-frame mode can always remain synchronized with the base station, since the second algorithm used for the multi-frame mode never changes.
  • the connection is actually established, information is exchanged between the base station and the mobile part to be connected via the first algorithm. After the information has been exchanged with regard to the first algorithm, the frames between two successive multiframe frames can then also be used after an agreement has been reached regarding the other carrier frequencies (first algorithm).
  • a multi-frame comprises 5 frames.
  • the carrier frequencies for the frames with the numbers 1 to 4 are specified by the first algorithm.
  • the value based on the second algorithm of the second calculation device 26 is used for the frame with the number 5 (multiframe frame). As shown in FIG. 4, this value can be, for example, a value (carrier frequency f 2 ) that was actually detected as disturbed by the first calculation device.
  • the invention relates in particular to a solution to the problem of how the base station can be informed (signaled) of the carrier frequency which the base station will use in the next following multiframe frame.
  • the solution according to the invention will now be explained, the structure of the DECT standard and in particular the structure of the A field and the header of the A field being explained first with reference to FIGS. 5a to 5e.
  • the time slot structure of a frame according to the DECT standard is shown once again in FIG. 5a.
  • a DECT frame has 24 time slots, the first 12 for the transmission from the base station to a mobile unit (downlink) and the following 12 for the transmission from one or more mobile units to the base station (uplink) ) be used.
  • the time slot and frame structure of the DECT standard and the carrier frequencies used according to the invention can be modified as desired in relation to the DECT standard.
  • the number of time slots per frame can be reduced from 24 to 12.
  • the 2.4 GHz ISM band can be used as the frequency band. Any other time slot and frame structures are possible.
  • FIG. 5b shows the structure of a time slot (fill slot) in detail, a time slot comprising 480 bits and having a duration of 416.7 ⁇ s in accordance with the DECT standard.
  • a time slot of the DECT standard has 32 bits of the synchronization field S, 388 bits of the so-called D field, 4 bits of the Z field, 56 bits.
  • the structure of the D field is shown in FIG. 5c.
  • the D field has 388 bits, 64 bits being assigned to the so-called A field, 320 bits to the B field and 4 bits to the so-called X field.
  • the A field has 64 bits, of which 8 bits are allotted to the so-called header, 40 bits are allotted to the so-called tail and 16 bits are allotted to the so-called R-CRC field.
  • 5e shows the 8 bits of the header of the A field.
  • the 3 TA bits describe which of the 8 possible messages of the A field is transmitted in the so-called tail (40 bits).
  • the Q bits are used for an exchange of information between the base and the handset with regard to the channel quality, and the 3 BA bits describe whether it is a so-called dummy bearer or a traffic bearer.
  • at least one so-called dummy bearer is constantly sent from each base station.
  • the Q1 bit and the Q2 bit are used for quality control.
  • the receiver can transmit information about the reception quality of the transmitted data to the transmitter. E.g. CRC errors during data transmission, the receiver informs the transmitter by setting the Q1 and Q2 bits about the interference in the channel. The receiver then performs a handover when CRC errors are accumulated.
  • the base station Since, as already mentioned, the base station is the master for the frequency hop algorithm, it is not necessary to transmit information in the Q bits from the base station to the handset. If the you my or traffic bearer information does not have the 3 BA bits are transmitted (but e.g. in one of the essages in the tail area), 5 free bits are available in the header in the downlink (connection base to the handset), namely the three BA and the 2 Q bits. The Q bits are still available in the uplink, ie in the direction of transmission from the mobile part to the base station, whereby the mobile part can inform the base station of the quality of the time slot received.
  • the handset can thus synchronize itself with a base station without any frequency information. If the handset wants to synchronize itself to the base station for the first time, it cannot determine the carrier frequency of the next time slot, but the signaling information that is transmitted in the bits of the header of the A field, however, the carrier frequency of the next multiframe Framework transmitted. With a multiframe mode periodicity of 16, this frame is a maximum of 15 frames away, so that synchronization of the 15 frames will not be lost in the period of these 15 frames. After multiframe synchronization has thus been achieved, the information exchange between the base station and the mobile part can then take place with regard to the first hop algorithm take place, whereby a carrier frequency synchronization can also take place with respect to the frames between two successive multiframe frames. The synchronization takes place in two steps. First, the carrier frequencies of the multiframe frames are synchronized. In a second step, the carrier frequencies of the frames are then synchronized between two successive multiframe frames.
  • any future frequencies can be digitally signaled wirelessly beforehand.
  • carrier frequency signaling is thus carried out in a particularly advantageous manner using the structure of the A field of the DECT standard. It should be pointed out once again that, according to the invention, the time slot and frame structure of the DECT standard can be changed as desired.
  • switching device fx carrier frequency

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention offre la possibilité de signaler numériquement une fréquence porteuse qui est utilisée à un moment prédéterminé après la signalisation. L'invention est mise en oeuvre en particulier selon ce que l'on appelle un mode multitrame d'une partie mobile (2) d'un système de transmission numérique, mode selon lequel la station mobile (2) ne reçoit des données en provenance d'une station fixe (1) que pendant ce que l'on appelle des intervalles multitrames, pour pouvoir se synchroniser sur la station fixe (1) en économisant de l'énergie. Un intervalle multitrame est prévu après chaque (m-1) intervalle de la transmission. La fréquence porteuse (fx) utilisée dans l'intervalle multitrame suivant par la station fixe (1) est signalée à la station mobile (2) par les bits qui correspondent aux bits de l'en-tête du champ A de la norme DECT. Selon l'invention, à partir de la signalisation et de la synchronisation des fréquences porteuses (fx) des intervalles multitrames qui ont été effectuées une fois en tant que première étape, la synchronisation des fréquences porteuses, en ce qui concerne les intervalles, peut être effectuée entre deux intervalles multitrames successifs.
PCT/DE1997/001732 1997-08-14 1997-08-14 Procede et systeme de transmission pour la signalisation d'une frequence porteuse WO1999009667A1 (fr)

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CA002300067A CA2300067A1 (fr) 1997-08-14 1997-08-14 Procede et systeme de transmission pour la signalisation d'une frequence porteuse
PCT/DE1997/001732 WO1999009667A1 (fr) 1997-08-14 1997-08-14 Procede et systeme de transmission pour la signalisation d'une frequence porteuse

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US8594576B2 (en) 2008-03-28 2013-11-26 Qualcomm Incorporated Short-term interference mitigation in an asynchronous wireless network
US9668265B2 (en) 2008-03-28 2017-05-30 Qualcomm Inc. Technique for mitigating interference in a celllar wireless communication netwok

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8594576B2 (en) 2008-03-28 2013-11-26 Qualcomm Incorporated Short-term interference mitigation in an asynchronous wireless network
US9668265B2 (en) 2008-03-28 2017-05-30 Qualcomm Inc. Technique for mitigating interference in a celllar wireless communication netwok
WO2009158546A1 (fr) * 2008-06-27 2009-12-30 Qualcomm Incorporated Atténuation d’interférence par la transmission sur un second niveau inférieur de puissance
RU2494573C2 (ru) * 2008-06-27 2013-09-27 Квэлкомм Инкорпорейтед Уменьшение помех посредством передачи на втором, пониженном, уровне мощности
US8761824B2 (en) 2008-06-27 2014-06-24 Qualcomm Incorporated Multi-carrier operation in a wireless communication network
US9854590B2 (en) 2008-06-27 2017-12-26 Qualcomm Incorporated Multi-carrier operation in a wireless communication network

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