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    • 专利摘要:
    The present invention relates to a method (50) for sending, by a terminal (20) of a wireless communication system (10), upstream messages on an uplink link to an access network (30). , comprising steps of: - (51) forming a sequence of NR uplink messages, each uplink message of the sequence comprising a same payload packet and control data comprising an identifier of the uplink message among the NR uplink messages of the sequence, - (52) transmitting the sequence messages of the sequence on different respective central frequencies. The present invention also relates to a method (60) of transmission, by the access network (30), of a downlink message in response to said sequence of upstream messages, on a central frequency determined from the measured center frequencies of the upstream messages of the sequence.
    公开号:FR3033464A1
    申请号:FR1551783
    申请日:2015-03-03
    公开日:2016-09-09
    发明作者:Lionel Zirphile；Nicolas Chalbos；Christophe Fourtet
    申请人:Sigfox SA；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The present invention belongs to the field of digital telecommunications, and more particularly relates to methods for transmitting data between terminals and an access network of a wireless communication system. STATE OF THE ART The present invention finds a particularly advantageous, though in no way limiting, application in ultra-narrowband wireless communication systems. By "ultra narrow band" ("Ultra Narrow Band" or UNB in the Anglo-Saxon literature), it is meant that the instantaneous frequency spectrum of the radio signals emitted by the terminals is of frequency width less than one kilohertz. Such UNB wireless communication systems are particularly suitable for applications of the type M2M (acronym for machine-to-machine) or the Internet of Things ("Internet of Things" or loT in the literature Anglo-Saxon). In such a UNB wireless communication system, the data exchanges are essentially monodirectional, in this case on a rising link between terminals and an access network of said system.
    [0002] The terminals transmit uplink messages that are collected by base stations of the access network, without having to first associate with one or more base stations of the access network. In other words, the upstream messages sent by a terminal are not intended for a specific base station of the access network, and the terminal transmits its upstream messages assuming that they can be received by at least one forwarding station. based. Such provisions are advantageous in that the terminal does not need to make regular measurements, particularly greedy in terms of power consumption, to determine the most appropriate base station to receive its upstream messages. The complexity lies in the access network, which must be able to receive uplink messages that can be transmitted at arbitrary times, and at arbitrary central frequencies within a frequency band multiplexing the different terminals. Such a mode of operation, in which the data exchanges 3033464 2 are essentially monodirectional, is quite satisfactory for many applications, such as for example remote reading of gas meters, water, electricity, remote monitoring buildings or houses, etc. In some applications, however, it may be advantageous to also be able to exchange data in the other direction, namely on a downlink from the access network to the terminals, for example to reconfigure a terminal and / or to control a terminal. actuator connected to said terminal. However, it is necessary to offer such capacity by limiting the complexity of the terminals.
    [0003] US Pat. No. 6,130,914 describes an example of a bidirectional UNB wireless communication system for limiting the complexity of the terminals. Indeed, in US Pat. No. 6,130,914, the central frequency on which the access network transmits a downlink message to a terminal, in response to an uplink message transmitted by said terminal, is determined by said access network. from the central frequency on which said amount message was received. Thus, the accuracy on the generation of the central frequency of the upstream message on the terminal side can be low and achieved by means of inexpensive frequency synthesis. In fact, the access network does not know 20 prior to which central frequency the uplink message is sent, and must by default listen to the uplink link over the entire frequency band multiplexing to detect this uplink message. The central frequency of the detected uplink message is estimated by the access network, and the terminal and the access network then have substantially the same reference frequency, in this case the central frequency of the uplink message, to generate the central frequency of the descending message. In other words, the terminal and the access network are then substantially synchronized in frequency, regardless of the accuracy of the frequency synthesis means of the terminal, since it is the access network that synchronizes in frequencies with said terminal, and not the other way around. In addition, since the terminal knows, from the central frequency of the amount message that it has emitted itself, determine the central frequency on which the descending message will be sent, it can listen to the downlink 3033464 3 only around said predetermined central frequency of the descending message, on a frequency band of width of the order of the instantaneous spectral width of the descending message, much lower than the width of the frequency band multiplexing.
    [0004] 5 Unlike the access network, the terminal must not listen to the entire frequency band multiplexing. In addition, since the descending message is sent in response to an amount message sent by the terminal, it must not listen to the downlink permanently, but only after sending a rising message.
    [0005] A problem occurs, however, when interference is present in the frequency multiplexing band. Indeed, if the terminal selects the central frequency of the amount message without checking the availability thereof, which is advantageous for dispensing said terminal to make regular measurements on the upstream link, then the amount message can be missed by the access network. In addition, the access network does not issue a downlink message and the terminal still listens to the downlink waiting for a downlink message. DISCLOSURE OF THE INVENTION The present invention aims to remedy all or part of the limitations of the solutions of the prior art, in particular those set out above, by proposing a solution which makes it possible to have better protection against interference. while limiting the listening needs of the downlink, by the terminal, waiting for a message descendant. For this purpose, and according to a first aspect, the invention relates to a method of transmitting, by a terminal of a wireless communication system, upstream messages on an upstream link to an access network, said method comprising steps, implemented by said terminal, of: - forming a sequence of NR upright messages, each uplink message of the sequence comprising a same packet of useful data and control data, said control data comprising an identifier of the rising message among the NR upstream messages of the sequence, - sending upstream messages of the sequence on different respective central frequencies, said terminal being configured to receive a downward message, sent in response to the message sequence amounts, on a central frequency having predefined respective frequency deviations from the central frequencies of the the sequence. Thus, the upstream messages of the sequence all include the same payload packet. This packet of useful data is therefore issued NR times on the amount link. In addition, the NR upstream messages of the sequence are transmitted on different respective central frequencies.
    [0006] Thus, even in the presence of interference in a part of the frequency multiplexing band, the access network can generally detect at least one of the NR upstream messages of the sequence, transmitted on a central frequency undisturbed by said interferences. , and extracting said payload packet. The probability of missing the useful data packet is therefore reduced by virtue of the frequency diversity introduced by the transmission of said payload packet into several upstream messages on respective different central frequencies. However, since the upstream messages of the sequence are transmitted on several different central frequencies, it is not possible for the access network, without providing other means, to know which central frequency should be used as the frequency. reference to determine the central frequency on which the descending message is to be sent. This is all the more true that all the upstream messages of the sequence are not necessarily received by the access network.
    [0007] For this purpose, the upstream messages of the sequence comprise respective identifiers making it possible to distinguish the NR upstream messages from the sequence between them. In addition, the central frequency of the downlink message has predefined respective frequency deviations from the center frequencies on which the NR upstream messages of the sequence are transmitted. The central frequencies of the upstream messages of the sequence are not known a priori of the access network, however the predefined frequency deviations are known a priori of the access network or can be determined by said access network. Said predefined frequency deviations are respectively associated with the different identifiers of the NR upright messages, so that it is possible to find, from the identifier of a rising message of the sequence, the frequency difference between the central frequency of this rising message and the central frequency on which the downlink message is to be transmitted. Thus, when it receives any amount of message of the sequence, the access network can measure the central frequency, extract the identifier, find the frequency difference associated with said extracted identifier and estimate as a function of said frequency difference frequency central on which 10 must be sent the message down. Therefore, the access network can unambiguously estimate the central frequency on which the outgoing message is to be transmitted, regardless of the amount message of the sequence it has received, even if upstream messages have been missed. for example due to interference in the frequency band multiplexing.
    [0008] In particular embodiments, the transmission method on the uplink may further include one or more of the following features, taken alone or in any technically possible combination. In particular modes of implementation, the identifiers of the upstream messages of the sequence respectively correspond to different predefined synchronization patterns. Such arrangements are advantageous in that the addition of the identifier in an upstream message of the sequence does not increase the amount of control data included in this upstream message. Indeed, the synchronization pattern, included for synchronizing the access network with said uplink message, is then further used to encode the identifier of the uplink message within the sequence, that is, to distinguish between them the NR upstream messages of the sequence. For this purpose, NR different synchronization patterns are considered, associated respectively with the different upstream messages of the sequence. The amount of control data of a synchronization pattern is not increased compared to the case where only one synchronization pattern is used. On the other hand, the access network must now compare each detected uplink message with several synchronization patterns, in order to simultaneously synchronize and extract the identifier of the detected uplink message. In particular modes of implementation, the upstream messages of the sequence are transmitted successively without time overlap between them. According to a second aspect, the present invention relates to a terminal comprising means configured to implement a transmission method on a rising link according to any of the embodiments of the invention.
    [0009] According to a third aspect, the present invention relates to a method for transmitting, by an access network of a wireless communication system, a downlink downlink message to a terminal in response to a request. sequence of upstream messages transmitted by said terminal according to a method of transmission on the uplink according to any one of the embodiments of the invention. The transmission method on the downlink comprises a step of searching for upstream messages on the upstream link and, when a rising message is detected, steps of: measuring the central frequency of the detected amount message; the identifier of the detected uplink message, - estimation of the central frequency on which the descending message is to be transmitted as a function of the measurement of the central frequency and the identifier extracted from said detected uplink message, - transmission of the descending message on the frequency estimated central 25. In particular embodiments, the downlink transmission method may further comprise one or more of the following characteristics, taken separately or in any technically possible combination.
    [0010] In particular modes of implementation, the extraction of the identifier of the detected uplink message comprises the comparison of said detected uplink message with different predefined synchronization patterns associated respectively with the different identifiers of the upstream messages of the sequence. In particular modes of implementation, the step of estimating the central frequency of the descending message comprises steps of: estimation of a reference frequency as a function of the measurement of the central frequency of the detected uplink message and a predefined frequency deviation, associated with the extracted identifier, between the reference frequency and the central frequency of the detected upright message, - estimation of the central frequency of the descending message as a function of the estimated reference frequency. In particular modes of implementation, the central frequency of the descending message is determined according to the predefined frequency deviation, associated with the extracted identifier, between the central frequency of the detected upline message and the central frequency on which it is to be transmitted. the descending message. According to a fourth aspect, the present invention relates to a base station comprising means configured to implement a transmission method on a downlink according to any of the embodiments of the invention.
    [0011] According to a fifth aspect, the present invention relates to an access network comprising means configured to implement a transmission method on a downlink according to any one of the embodiments of the invention. PRESENTATION OF THE FIGURES The invention will be better understood on reading the following description, given by way of non-limiting example, and with reference to the figures which represent: FIG. 1: a schematic representation of a communication system wireless, 30 - Figure 2: a diagram illustrating the main steps of a transmission method on a rising link, - Figure 3: a diagram illustrating the main steps of a transmission process on a downlink.
    [0012] In these figures, identical references from one figure to another designate identical or similar elements. For the sake of clarity, the elements shown are not to scale unless otherwise stated. DETAILED DESCRIPTION OF EMBODIMENTS FIG. 1 schematically represents a wireless communication system 10, for example of the UNB type, comprising several terminals 20 and an access network 30 comprising several base stations 31. The terminals 20 and the stations base 31 of the access network 30 10 exchange data in the form of radio signals. By "radio signal" is meant an electromagnetic wave propagating via non-wired means, the frequencies of which are included in the traditional spectrum of radio waves (a few hertz to several hundred gigahertz).
    [0013] The terminals 20 are adapted to send uplink messages on a uplink link to the access network 30. The uplink messages are for example transmitted asynchronously. By "asynchronously transmitting" is meant that the terminals 20 autonomously determine when they transmit and / or on which central frequency they transmit, without coordinating said terminals 20 with each other and with the base stations 31 of the network. In the remainder of the description, reference is made in a nonlimiting manner in the case where the terminals 20 are at least asynchronous in frequency, so that the upstream messages are transmitted on central frequencies which are not known prior to the network. Each base station 31 is adapted to receive the upstream messages from the terminals 20 which are within range. Each incoming message thus received is for example transmitted to a server 32 of the access network 30, possibly accompanied by other information such as an identifier of the base station 31 which received it, the measured power of said received message amount, the date of receipt of said amount message, the measured center frequency of said received amount message, etc. For example, the server 32 processes all the incoming messages received from the different base stations 31. In addition, the access network 30 is also adapted to transmit, via the base stations 31, messages that descend on a downlink to the terminals 20, which are adapted to receive them. The downstream messages are for example issued at the initiative of the access network 30. In such a case, the terminals 20 must constantly listen to the downlink, waiting for a possible downlink message. In the remainder of the description of the description, one places oneself in a nonlimiting manner in the case where the access network 30 sends outgoing messages in response to the upstream messages sent by terminals 20, so that the terminals 20 should in principle listen to the downlink, waiting for a downlink message, only after sending one or more upstream messages to the access network 30. A) Method of transmission on the upstream link 15 FIG. 2 schematically represents the main steps of a method 50 of transmission, by a terminal 20, of useful data packets on the uplink link to the access network 30. For example, the terminal 20 comprises a processing module (Not shown in the figures), comprising one or more processors and storage means (magnetic hard disk, electronic memory, optical disk, etc.) in which is stored a computer program product, It is in the form of a set of program code instructions to be executed to implement the various steps of the transmission process on the uplink. In a variant, the processing module 25 comprises one or more programmable logic circuits, of the FPGA, PLD, etc. type, and / or specialized integrated circuits (ASIC) adapted to implement all or part of the said steps of the method 50 of FIG. issue on the up link. Each terminal 20 furthermore comprises wireless communication means, considered as known to those skilled in the art, enabling said terminal 30 to send up messages and to receive descendant messages in the form of radio signals. In other words, the terminal 20 comprises a set of means configured in software (specific computer program product) and / or hardware (FPGA, PLD, ASIC, etc.) to implement the different steps of the transmission process 50 on the uplink link. As illustrated in FIG. 2, the method of transmitting on the uplink mainly comprises the following steps, which will be described in more detail below: formation of a sequence of NR upright messages from a same packet of useful data, the transmission of the messages amount of the sequence on different respective central frequencies.
    [0014] It should be noted that the order of the steps illustrated in FIG. 2 is not limiting, except that an upstream message of the sequence, in order to be effectively transmitted, must first have been formed. For example, if the upstream messages of the sequence are sent successively, it is possible: to first form the first up message of the sequence 15 (step 51) and to transmit it on the upstream link (step 52), then forming the second amount message of the sequence (step 51) and sending it on the rising link (step 52), etc. A.1 Formation of the NR sequence of the amounts During the step 51 of forming the sequence of upstream messages, NR upstream messages are formed from the same payload packet. In other words, all the NR upstream messages of the sequence comprise the same payload packet, so that it suffices that one of the upstream messages of the sequence is received by the access network 30 so that said data packet can be extracted.
    [0015] The number NR of upstream messages of the sequence, i.e. the number of replicas of the same payload packet transmitted on the upstream link, is equal to or greater than two. In the remainder of the description, one places oneself in a nonlimiting manner in the case where the number NR is equal to three, so that the sequence comprises three rising messages respectively M1, M2 and M3, comprising the same packet of useful data. . It should be noted that, although the same payload packet is sent in each upstream message of the sequence, different processing may be applied on said payload packet of a message of the sequence amount to one. other. For example, it is possible to apply on the payload packet a different channel coding from one upstream message to another in the sequence. For example, the same error correction code may be applied to the payload packet, and the encoded useful data may be punched so as to obtain the same coding rate for all upstream messages of the sequence, but considering a different punching pattern from one message to another. For example, in the case where the encoded payload includes the payload packet and parity bits added by the error correcting code, the punching may only affect the parity bits, so that the parity bits transmitted vary from one rising message to another in the sequence. Such arrangements make it possible, when several upstream messages of the sequence are received by the access network 30, to improve the robustness of the error-correcting decoding by exploiting more redundancy.
    [0016] If the processing applied to the payload packet may vary from one upstream message to another in the sequence, the payload packet must be retrievable by the access network from any of the messages. amounts Ml, M2, M3 of the sequence. Each rising message M1, M2, M3 of the sequence includes, in addition to said payload packet, control data. According to the invention, said control data for each upstream message of the sequence comprise an identifier of the upstream message making it possible to distinguish the NR upstream messages from the sequence between them. For example, the identifier may be in the form of a counter of the upstream messages of the sequence, which is inserted into the uplink message in addition to the other control data. For example, for the up message M1 of the sequence, the inserted counter is equal to 1, for the amount message M2 of the sequence, the inserted counter is equal to 2, and for the amount message M3 of the sequence, the inserted counter is equal to 3.
    [0017] If such a counter can be encoded with a reduced number of additional bits (two bits are sufficient in the case where NR is equal to three), it is desirable, especially for low bit rate applications such as most M2M or loT applications. to minimize the amount of control data in the upstream messages. For this purpose, in preferred modes of implementation, the identifiers of the upstream messages of the sequence correspond to different predefined synchronization patterns.
    [0018] Indeed, it is known to insert, in a rising message, a temporal and / or frequency synchronization pattern that is used by the access network 30 to estimate the start time of the uplink message and / or to estimate precisely the central frequency of said amount message. Advantageously, rather than using the same synchronization pattern for all the upstream messages of the sequence, NR different synchronization patterns are considered, respectively associated with the different upstream messages of the sequence. The NR different synchronization patterns are for example stored in a non-volatile memory of the terminal 20. Therefore, for the rising message M1 of the sequence, the terminal 15 inserts the index synchronization pattern 1, for the message M2 upstream of the sequence, the terminal 20 inserts the index synchronization pattern 2, etc. Since the synchronization pattern is different from one message up from one sequence to another, the access network 30 can distinguish the NR upstream messages from the sequence by analyzing the synchronization pattern of each detected upstream message. Since the synchronization pattern is used both for synchronization and to distinguish the NR upstream messages from the sequence between them, the amount of control data inserted in each upstream message is not increased compared to the case where a only synchronization pattern is used.
    [0019] A.2) Transmission of the Sequence Up Messages During the transmission step 52, the upstream messages M1, M2, M3 of the sequence are transmitted on respective central frequencies F1, F2 and F3 different from the first one. inside a frequency band of multiplexing the different terminals 20.
    [0020] In addition, the terminal 20 is configured to receive a downlink message transmitted in response to the sequence of NR upstream messages M1, M2, M3, on a central frequency Fp having respective frequency deviations AFD [1], AFD [2] , AFD [3] predefined in relation to the frequencies 3033464 13 central F1, F2 and F3. In other words, the central frequency Fp on which the descending message must be sent, and the central frequencies F1, F2, F3 satisfy the following expressions: Fp = F1 + AFD [1] 5 Fp = F2 + AFD [2] Fp = F3 + AFD [3] Thus, the terminal 20 knows a priori which central frequency Fp it must receive the downlink message transmitted in response to the sequence of NR messages amounts M1, M2, M3. Since the terminal 20 must receive, after having sent out said sequence of NR upright messages, one or more messages that descend only on a single central frequency, in this case the central frequency Fp, said terminal 20 must therefore not listen the downlink over the entire frequency band multiplexing, but only on a frequency band of reduced width around said central frequency Fp. The width of said frequency band on which the terminal 20 listens for the downlink is, for example, of the order of the instantaneous spectral width of the descending message, for example twice as large as said instantaneous spectral width of said downward message (to take account of the inaccuracy on the synthesis of the central frequency, the frequency drift of the frequency synthesis means, a possible Doppler effect, etc.). Because the terminal 20 only listens for the downlink on a frequency band of limited width, the complexity of the processing associated with finding the downlink message on the downlink is greatly reduced. Furthermore, the number of downstream messages likely to be detected by said terminal 20, including downlink messages which are not intended for it, is greatly reduced compared to the case where the terminal 20 could receive messages descending on n. any central frequency of the downlink. The frequency deviations AFD [1], AFD [2], AFD [3], and the upstream messages Ml, M2, M3 of the sequence to which they apply are known a priori from the access network 30, or can to be determined by said access network 30. Therefore, since the access network 30 can, thanks to the identifiers, distinguish the upstream messages M1, M2, M3 from the sequence 3033464 14 between them, the access network. 30 can also find the predefined frequency deviation associated with any detected upstream message of the sequence, and estimate the central frequency Fp from a measurement of the central frequency of said detected amount message.
    [0021] To generate the center frequencies F1, F2 and F3, the terminal 20 may for example use a reference frequency FR. For example, the reference frequency FR is selected within the frequency multiplexing band, preferably in a substantially random manner by means of a pseudo-random generator.
    [0022] The center frequencies F1, F2 and F3 can be generated by means of respective frequency deviations AF1, AF2 and AF3 predefined with respect to the reference frequency FR. In other words, the center frequencies F1, F2, F3 and the reference frequency FR satisfy the following expressions: F1 = FR + AF1 15 F2 = FR + AF2 F3 = FR + AF3 For example, the reference frequency FR can be considered as the central frequency F1, in which case the frequency difference AF1 is zero. The central frequency F2 is then equal to (F1 + AF2) and the central frequency F3 is then equal to (F1 + AF3). In another example, the reference frequency FR corresponds to the central frequency Fp on which the descending message is to be sent, in which case: AF1 = - AFD [1] AF2 = - AFD [2] 25 AF3 = - AFD [3] It should be noted that, although the center frequencies F1, F2 and F3 have respective frequency deviations AF1, AF2 and AF3 predefined with respect to the reference frequency FR, they are not necessarily all generated from said reference frequency EN. For example, it is possible to generate the center frequency F1 directly from the reference frequency FR, then to generate the center frequency F2 from the center frequency F1 by applying a frequency jump AF2 'equal to (AF2 - AF1), and then to generate the center frequency F3 from the central frequency F2 by applying a frequency jump AF3 'equal to (AF3 - AF2). For a UNB type wireless communication system, it is possible to consider frequency differences of the order of a few kilohertz (kHz) to a few tens of kilohertz. For example, center frequencies F1, F2 and F3 may be spaced 20 kHz. For example, if we consider that the frequency difference AF1 is zero, it is possible to consider a frequency difference AF2 equal to 20 kHz and a frequency difference AF3 equal to -20 kHz, or a frequency difference AF2 equal to 20 kHz and a frequency differential AF3 equal to 40 kHz, etc.
    [0023] The frequency differentials AF1, AF2, AF3 and the frequency deviations AFD [1], AFD [2], AFD [3] are interconnected by the following expressions: AFD [1] = AFD - AF1 AFD [2] = AFD AFD corresponds to a predefined frequency difference between the central frequency Fp and the reference frequency FR (AFP = FE) - FR). In preferred embodiments, the NR upstream messages of the sequence are transmitted successively, without temporal overlap between them. Such arrangements also make it possible to reduce the complexity of the processing to be performed by the terminal 20 for the transmission of the NR sequence of upstream messages. Indeed, if the NR upstream messages of the sequence were transmitted simultaneously, then the terminal 20 should work with a higher sampling frequency to generate in the baseband of the upstream messages M1, M2, M3 spaced in frequency 25 by the deviations Frequencies AF2 'and AF3' and / or the wireless communication means of the terminal 20 should have more complex analog transmission channels for simultaneously translating the upstream messages M1, M2, M3 on different respective central frequencies. Nothing, however, excludes, according to other examples, having all or part of the upstream messages of the transmitted sequence with a non-zero temporal overlap, for example issued simultaneously. B) Downlink transmission method FIG. 3 schematically represents the main steps of a method 60 of transmission, by the access network 30, of a downlink message to the downlink to a terminal 20, in response to a sequence of upstream messages sent by said terminal 20 in accordance with a transmission method 50 on the upstream link.
    [0024] As illustrated in FIG. 3, the downlink transmission method 60 firstly comprises a step 61 of searching for upstream messages on the upstream link. The search for upstream messages on the upstream link continues until a rising message has been detected (reference 610 in FIG. 3).
    [0025] When a rising message is detected (reference 611 in FIG. 3), the transmission method 60 then comprises steps of: measuring the central frequency of the detected upstream message, extracting the identifier of the message detected amount, - 64 estimation of the central frequency on which the descending message is to be transmitted as a function of the measurement of the central frequency and of the identifier extracted from said detected uplink message, - 65 transmission of the descending message on the estimated central frequency . It should be noted that the order of the steps 62 for measuring and 63 for extracting the identifier is irrelevant. In addition, if it is determined that several detected uplink messages belong to the same sequence of uplink messages sent by the same terminal 20 (for example by using specific control data, for example an identifier of the payload packet 25 transmitted in this sequence as well as an identifier of the terminal 20 having sent said sequence of upstream messages), then it is not necessary to perform the steps of the transmission method 60 on the downlink for each message rising from the detected sequence . In particular, the central frequency Fp on which the downlink message is to be transmitted is preferably estimated once. If only one downlink message is to be sent in response to the upstream message sequence, the transmit step 65 is executed once. If several downstream messages are to be transmitted in response to said upstream message sequence, they are preferably all sent on the same central frequency. For example, in the case where the upstream messages of the sequence are transmitted successively, without temporal overlap, it may be advantageous to measure only the central frequency of the last detected amount message of the sequence, or at least to use only the central frequency measured for said last ascending detected message to estimate the central frequency on which the downward message is to be transmitted. Of the various steps illustrated in FIG. 3, only the step 65 of sending the downlink message must necessarily be executed at least partially by a base station 31. The other steps illustrated in FIG. 3 can be executed by a station base 31 and / or by the server 32 of the access network 30. In particular, all the steps illustrated in Figure 2 can be performed by the base station 31 used to issue the downlink message on the downlink.
    [0026] In the remainder of the description, reference is made in a nonlimiting manner in the case where the search and measurement steps 61 are executed by a base station 31, which then transmits the detected amount message and the measurement of the frequency The server 32 then extracts (step 63) the identifier of the detected upstream message, and estimates (step 64) the central frequency at which the downstream message is to be transmitted. The server 32 also forms the descending message, possibly after extracting the payload packet from the detected upstream message, and transmits said downlink message and the estimated central frequency of said downlink message to a base station 31 in whose coverage 25 is located. the terminal 20. The base stations 31 and the server 32 comprise, for example, respective processing modules (not shown in the figures), each processing module comprising for example one or more processors and storage means (magnetic hard disk, electronic memory, optical disk, etc.) in which is stored a computer program product, in the form of a set of program code instructions to be executed to implement the various steps of the transmission process 60 on the downlink. In a variant, each processing module comprises one or more programmable logic circuits, of the FPGA, PLD, etc. type, and / or specialized integrated circuits (ASIC) adapted to implement all or part of the said steps of the method 60 of the present invention. emission on the downlink.
    [0027] Each base station 31 further comprises wireless communication means, considered as known to those skilled in the art, enabling said base station to receive upstream messages and to transmit messages in the form of messages. radio signals. The base stations 31 and the server 32 also comprise respective network communication means, considered as known to those skilled in the art, enabling the server 32 to exchange data with each base station 31. In other words, the access network 30 comprises a set of means configured in software (specific computer program product) and / or hardware (FPGA, PLD, ASIC, etc.) to implement the various steps of the software. method 60 of transmission on the downlink. Nonlimiting examples of implementation of the various steps of the downlink transmission method 60 are now described. B.1) Search for upstream messages and central frequency measurement Step 61 for finding upstream messages on the upstream link is considered as known to those skilled in the art, and for example comprises a calculation of a spectrum frequency in the frequency band of multiplexing, and the search for local maxima in said frequency spectrum higher than a predefined detection threshold value.
    [0028] When a rising message is detected, the step 62 for measuring the central frequency of the detected uplink message consists, for example, in obtaining the frequency associated with the local maximum of the frequency spectrum that led to the detection of said uplink message. B.2) Extraction of the identifier During the extraction step 63, the identifier of the detected upstream message, making it possible to distinguish the NR upstream messages from the sequence between them, is extracted from the detected amount message. The extraction of said identifier depends on the manner in which it has been incorporated into the uplink message, and is considered to be within the abilities of those skilled in the art. In the case described above, where different synchronization patterns are used to distinguish the NR upstream messages from the sequence, then the extraction of the identifier of the detected upstream message 5 comprises for example the comparison of said detected amount message with the different messages. synchronization patterns, for example previously stored in a non-volatile memory of the access network 30. This comparison aims to measure the resemblance between the detected uplink message and each possible synchronization pattern, for example by correlation. The extracted identifier 10 corresponds to that associated with the synchronization pattern making it possible to optimize the resemblance with the detected amount message. At the end of step 63 of extraction, it is therefore known which message rising, among the NR upstream messages of the sequence, has been detected. B.3) Estimation of the central frequency of the downlink As previously indicated, the NR upstream messages M1, M2, M3 of the sequence are transmitted at respective center frequencies F1, F2, F3, and the central frequency Fp on which the descending message is to be transmitted has respective frequency deviations AFD [1], AFD [2], AFD [3] predefined with respect to said central frequencies F1, F2 and F3.
    [0029] The frequency deviations AFD [1], AFD [2], AFD [3] are therefore associated in a one-to-one way with the various upstream messages M1, M2, M3 of the sequence, and are known a priori from the access network 30, or can be determined by said access network 30. To estimate the central frequency Fp, the access network 30 can for example store, in a non-volatile memory, the frequency differences AF1, AF2 and AF3 associated respectively with the identifiers of the messages amounts Ml, M2, M3, as well as the frequency differential AFD. In such a case, the step 64 for estimating the central frequency Fp of the downlink message comprises steps (not shown in the figures) of: estimating the reference frequency FR as a function of the measurement of the central frequency of the detected upstream message and the predefined frequency deviation, associated with the extracted identifier, between the reference frequency FR and the central frequency of the detected upright message, - estimation of the central frequency FD of the downlink message as a function of the frequency estimated FR reference and AFD frequency deviation.
    [0030] For example, if the extracted identifier corresponds to the identifier of the upstream message M2 of the sequence, then the access network 30 finds the associated frequency deviation AF2 and can estimate the reference frequency FR according to the following expression: FR = F'2 - AF2 10 expression in which: - F'R corresponds to the estimate of the reference frequency FR, - F'2 corresponds to the measured value of the central frequency F2 of the rising message M2 of the sequence. Then, the center frequency FD of the downlink message can be estimated according to the following expression: F'0 = F'R + AFD expression in which F'0 corresponds to the estimated value of the central frequency FD of the downlink message. In another example, the access network 30 stores, in a non-volatile memory, the frequency deviations AFD [1], AFD [2] and AFD [3] respectively associated with the identifiers of the upstream messages M1, M2, M3. In such a case, the central frequency FD of the descending message is estimated as a function of the predefined frequency deviation, associated with the extracted identifier, between the central frequency of the detected upline message and the central frequency FD 25 on which the transmitted frequency is to be transmitted. descending message. For example, if the extracted identifier corresponds to the identifier of the upstream message M3 of the sequence, then the access network 30 regains the frequency differential AFD [3] and can estimate the central frequency FD of the downlink message according to the following expression: F'0 = F'3 + AFD [3] expression in which F'3 corresponds to the measured value of the central frequency F3 of the rising message M3 of the sequence. B.4) Transmission of the descending message 3033464 21 At the end of the estimation step 64, the access network 30 has an estimate Fp of the central frequency Fp on which the terminal 20 expects to receive the descending message. Therefore, in step 65, the downlink message is transmitted on the central frequency F'0, by a base station 31 in the coverage of which is the terminal 20 (for example the base station 31 having detected the sequence of upstream messages sent by said terminal). More generally, it should be noted that the embodiments and embodiments considered above have been described by way of nonlimiting examples, and that other variants are therefore possible. In particular, the invention has been described by considering frequency asynchronous terminals. The invention is however applicable to any type of terminal 20, since the access network 30 estimates the central frequency Fp on which it must send a message down from the measured central frequency of one or more messages amounts received from this terminal 20. For example, the invention is applicable when the terminal 20 is not, or can not, synchronize in frequency with the access network 30 with sufficient precision and therefore it is the access network 30 which, to transmit a message going down to the terminal 20, synchronizes in frequency with said terminal 20.
    权利要求:
    Claims (9)
    [0001]
    CLAIMS1 - A method (50) for sending, by a terminal (20) of a wireless communication system (10), upstream messages on an upstream link to an access network (30), characterized in that said method comprises steps, implemented by said terminal (20), of: - (51) forming a sequence of NR uplink messages, each uplink message of the sequence comprising a same payload packet and data control, said control data comprising an identifier of the rising message among the NR upstream messages of the sequence, - (52) sending upstream messages of the sequence on different respective central frequencies, said terminal being configured to receive a downward message, transmitted in response to the sequence of upstream messages, on a central frequency having predefined respective frequency deviations from the central frequencies of the upstream messages of the sequence in this.
    [0002]
    2 - Method (50) according to claim 1, wherein the identifiers of the upstream messages of the sequence respectively correspond to different predefined synchronization patterns.
    [0003]
    3 - Process (50) according to one of claims 1 to 2, wherein the upstream messages of the sequence are emitted successively without time overlap between them.
    [0004]
    4 - Terminal (20) characterized in that it comprises means configured to implement a method (50) of transmission on a rising link according to one of the preceding claims.
    [0005]
    5 - Method (60) for transmitting, by an access network (30) of a wireless communication system (10), a downlink message to a terminal (20) in a downlink response to a sequence of upstream messages sent by said terminal according to one of claims 1 to 3, characterized in that said method comprises a step (61) of looking for upstream messages on the up link, when a rising message is detected, steps of: - measuring the central frequency of the detected amount message, - (63) extracting the identifier of the detected amount message, - (64) estimating the central frequency on which to be transmitted. the downlink message as a function of the measurement of the central frequency and the identifier extracted from said detected upstream message; - (65) transmission of the downward message on the estimated central frequency. The method (60) according to claim 5, wherein the extraction of the identifier of the detected upstream message comprises the comparison of said detected upstream message with different predefined synchronization patterns associated respectively with the different identifiers of the upstream messages of the sequence. Method (60) according to one of Claims 5 to 6, in which the step (64) for estimating the central frequency of the descending message comprises steps of: - estimation of a reference frequency as a function of the measurement of the central frequency of the detected upstream message and of a predefined frequency deviation, associated with the extracted identifier, between the reference frequency and the central frequency of the detected upstream message, - estimation of the central frequency of the downward message as a function of the estimated reference frequency. Method (60) according to one of Claims 5 to 6, in which the central frequency of the descending message is determined as a function of the predefined frequency deviation, associated with the extracted identifier, between the central frequency of the detected uplink message and the central frequency on which the descending message is to be sent. Base station (31) characterized in that it comprises means configured to implement a downlink transmission method (60) according to one of claims 5 to 8. 10 - Access network (30) ) characterized in that it comprises means configured to implement a downlink transmission method (60) according to one of claims 5 to 8. 5
    [0006]
    6 - 10
    [0007]
    7 - 15 20
    [0008]
    8 - 25
    [0009]
    9 - 30
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    同族专利:
    公开号 | 公开日
    EP3266256B1|2019-01-23|
    CN107409373B|2020-06-16|
    ES2718577T3|2019-07-02|
    KR20170125386A|2017-11-14|
    EP3266256A1|2018-01-10|
    FR3033464B1|2017-03-31|
    CN107409373A|2017-11-28|
    US20180054815A1|2018-02-22|
    BR112017018796A2|2018-04-24|
    WO2016139408A1|2016-09-09|
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1551783A|FR3033464B1|2015-03-03|2015-03-03|METHODS FOR TRANSMITTING DATA BETWEEN A TERMINAL AND A FREQUENCY SYNCHRONIZED ACCESS NETWORK ON AN AMOUNT MESSAGE OF SAID TERMINAL|FR1551783A| FR3033464B1|2015-03-03|2015-03-03|METHODS FOR TRANSMITTING DATA BETWEEN A TERMINAL AND A FREQUENCY SYNCHRONIZED ACCESS NETWORK ON AN AMOUNT MESSAGE OF SAID TERMINAL|
    US15/552,789| US10555289B2|2015-03-03|2016-02-25|Methods for transmitting data between a terminal and a frequency-synchronized access network on an uplink message from said terminal|
    ES16713530T| ES2718577T3|2015-03-03|2016-02-25|Data emission procedures between a terminal and a frequency synchronized access network in an upstream message from said terminal|
    KR1020177027815A| KR20170125386A|2015-03-03|2016-02-25|A method for transmitting data between a terminal and an access network whose frequency is synchronized with the terminal|
    EP16713530.0A| EP3266256B1|2015-03-03|2016-02-25|Methods for transmitting data between a terminal and a frequency-synchronised access network on an uplink message from said terminal|
    BR112017018796-5A| BR112017018796A2|2015-03-03|2016-02-25|methods for transmitting data between a terminal and a frequently synchronized access network in an uplink message from said terminal|
    CN201680012787.0A| CN107409373B|2015-03-03|2016-02-25|Method, terminal, base station and access network for sending message|
    PCT/FR2016/050441| WO2016139408A1|2015-03-03|2016-02-25|Methods for transmitting data between a terminal and a frequency-synchronised access network on an uplink message from said terminal|
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