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  • 权利要求
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    • 专利摘要:
    The present invention relates to a method (50) for wireless communication between a plurality of terminals (20) and an access network (30), said access network being configured to transmit downlink messages in response to a downlink. uplink messages transmitted by the terminals, said access network comprising a plurality of half-duplex base stations (31), each terminal waiting for a downlink message in response to a sent-up message being configured to listen to the downlink on a listening window of duration at least five times longer than the duration of the downlink message. The method comprises steps of: - (51) determining whether terminal listening windows have an overlap, - when an overlap allows the transmission of several downgoing messages by the same base station: (52) transmission of said messages descendants grouped in the same transmission window of said base station.
    公开号:FR3033118A1
    申请号:FR1551394
    申请日:2015-02-19
    公开日:2016-08-26
    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 a method and a wireless communication system between terminals and an access network. 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. 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 on arbitrary central frequencies. Each base station of the access network receives messages from the various terminals that are within its reach. Such a mode of operation, in which the data exchanges 3033118 2 are essentially monodirectional, is quite satisfactory for many applications, such as, for example, remote reading of gas, water and electricity meters, 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 a capacity by limiting the impact on the electricity consumption of the terminals.
    [0002] US 6130914 discloses an example of a bidirectional UNB wireless communication system for limiting the impact on the power consumption of the terminals. Indeed, in US Pat. No. 6,130,914, a downlink message is sent to a terminal during a predetermined listening window with respect to an amount message sent by said terminal. More particularly, after sending a rising message, a terminal goes into a sleep mode (or energy saving) on a standby window of predetermined duration. At the end of said idle window, the terminal leaves the idle mode to listen to the downlink on a listening window of limited duration, waiting for a downlink message sent by a base station. On the access network side, the listening windows of the different terminals can be determined from the received messages received from these terminals, and the access network must organize the transmission of the downstream messages so that they can be received by the corresponding terminals, 25 during the respective listening windows of said terminals. Since the terminals listen to the downlink only on predetermined listening windows, the additional power consumption required for the reception of downstream messages is limited, and said terminals can be most often in standby mode. In addition, since they must not transmit and receive simultaneously, such terminals can be half-duplex ("half-duplex" in the English literature), and can therefore be inexpensive to manufacture. In addition, since the terminals are not previously associated with particular base stations, the access network does not know which terminals are within range of the different base stations. This problem is also solved since a terminal only listens after sending a rising message, so that it suffices to use a base station that has received said amount message to send the downward message to this terminal. . However, for such bidirectional UNB wireless communication systems, it is also desirable, for reasons of, in particular, the cost of deploying the access network, to use half-duplex base stations, i.e. base which may receive uplinks 10 and send outgoing messages, but not simultaneously. In such a case, it is understood that a base station that goes into a transmission mode, to send a downlink message to a terminal, is no longer available to receive messages sent by other terminals, from so that many amounts messages can be missed.
    [0003] 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 that allows for bidirectional data exchanges while by limiting the periods of unavailability in reception of the 20 different base stations of the access network. For this purpose, and according to a first aspect, the invention relates to a method of wireless communication between a plurality of terminals and an access network, said terminals asynchronously transmitting uplink messages on an uplink link destined for the network. access, said access network being configured to transmit downlink downlink messages in response to all or part of the upstream messages, said access network including a plurality of base stations configured to transmit downstream messages in transmit windows in which said base stations can not receive uplink messages. Each terminal waiting for a downward message in response to a sent amount message is configured to listen to the downlink on a predetermined listening window with respect to said upstream message, said listening window being of duration at least five times greater than the downlink message duration, the method comprises steps of: - determining whether listening windows of terminals waiting for downstream messages have an overlap, - when there is a recovery adapted to the transmission of several messages descendants by the same base station: transmission of said descendant messages grouped in the same transmission window of said base station, within said cover. Thus, the terminals listen to the downlink on a listening window of much greater duration than necessary to receive the downstream messages. Such arrangements make it possible to increase the probability of having different terminal listening windows that partially overlap, and thus to increase the probability of being able to group the messages going down to these terminals and to transmit them by means of from the same base station. When an overlap between listening windows of different terminals allows the transmission of the corresponding descendant messages by the same base station, then said downstream messages are advantageously grouped together in the same transmission window of said base station. Thus, the unavailable time of reception of the base station can be limited. Indeed, the duration of unavailability in reception of a base station is determined by the duration of the transmission windows, but also by the switching times of a reception mode of said base station to a transmission mode, and Conversely. By configuring a single transmission window to transmit several downgoing messages, the number of switching between receive mode and transmit mode is greatly reduced, and the associated reception downtime is also reduced. In particular embodiments, the wireless communication method may further include one or more of the following features, taken alone or in any technically feasible combination. In particular modes of implementation, when downstream messages are transmitted grouped in the same transmitting window of a base station, at least two downgoing messages are transmitted simultaneously on different respective central frequencies. Such arrangements can further reduce the downtime of receiving base stations. Indeed, by transmitting the downgoing messages simultaneously (i.e. with a non-zero temporal overlap between said downstream messages), then the time required to transmit said downstream messages is significantly less than the sum of the respective durations of said messages. descendants. In particular modes of implementation, the central frequency of a downlink message sent in response to a rising message is determined according to the central frequency of said upstream message. In particular modes of implementation, when downstream messages are transmitted grouped in the same transmission window of a base station, at least two downstream messages are emitted successively. Thus, the descendant messages can also be grouped temporally (that is to say sent successively, without temporal overlap). Such arrangements may be advantageous, especially when two downstream messages are to be transmitted on the same central frequency and therefore can not be transmitted simultaneously. Such arrangements may also be advantageous for limiting the instantaneous power of the radio signals emitted by the base station, or for more easily transmitting downstream messages using different respective communication protocols, etc.
    [0004] In particular modes of implementation, when several downstream messages can be grouped together in the same transmitting window of a base station, said downstream messages are grouped together frequently, that is to say transmitted simultaneously on frequencies respective respective power plants, as long as the total instantaneous power of said downwardly grouped downward messages is less than a predefined maximum power, and then grouped together temporally, i.e., successively transmitted, if said total instantaneous power of said downstream messages grouped together 3033118 6 becomes greater than said maximum power. Thus, the total instantaneous power can be kept below a predefined maximum power during the entire duration of the transmission window (for example to comply with regulatory constraints), while minimizing the unavailability time in reception of the transmission station. base, giving priority when possible to the frequency grouping of the descendant messages in relation to the temporal grouping. In particular modes of implementation, when downstream messages are transmitted grouped together in the same transmitting window of a base station, at least one downlink message is transmitted with a bit rate greater than the rate of the reply message in which said descending message is issued. Such arrangements further reduce the downtime of reception of the base station. Indeed, by sending one or, preferably, each downlink message with a bit rate greater than the rate of the upstream messages, then the duration of transmission of the downstream messages will be reduced compared to what it would have been using the same bit rate as that of the rising messages. In particular modes of implementation, the wireless communication system also comprising several terminals, called "asynchronous reception terminals", adapted to receive downgoing messages at any time, said method comprises, when a downlink message must be transmitted to an asynchronous terminal receiving, steps of: - determining whether said downlink message can be sent by a base station intended to send a downlink message in response to a rising message sent by a terminal, said terminal synchronous reception ", - when said downlink message to the receiving asynchronous terminal 30 can be sent by the base station intended to send a downlink message to a synchronous terminal in reception: transmission of said downlink messages grouped together in one and the same transmission window of 3033118 7 said base station. Thus, several types of terminals can coexist in the wireless communication system: synchronous reception terminals, that is to say terminals that can receive messages only during predetermined listening windows with respect to the amount of messages they have sent, - asynchronous terminals in reception, which can receive messages descending at any time.
    [0005] In such a case, it is possible to group, for a transmission in the same transmission window of a base station, downstream messages to synchronous reception terminals and downstream messages to asynchronous terminals on reception. . According to a second aspect, the present invention relates to a terminal 15 of a wireless communications system, said terminal being adapted to transmit uplink messages on a uplink link to an access network, said access network being adapted to transmit descendant downlink messages to said terminal in response to all or part of the upstream messages, said terminal being configured to, when it has sent an upstream message in response to which the access network is to issue a downlink message, listen downlink, to receive the downlink message, on a predetermined listening window with respect to said amount message. According to the invention, the duration of the listening window is at least five times longer than the duration of the downward message.
    [0006] In particular embodiments, the terminal is configured to, when it has sent a rising message in response to which the access network is to transmit a downlink message, to enter a sleep mode on a standby window of predetermined duration and after the idle window, listen to the downlink on the listening window.
    [0007] According to a third aspect, the present invention relates to an access network of a wireless communications system comprising a plurality of base stations configured to transmit radio signals in transmission windows during which said base stations do not 3033118 8 can not receive radio signals. Said system comprising a plurality of terminals according to any one of the embodiments of the invention, said terminals asynchronously transmitting uplink messages on the uplink, the access network is further configured to: - determine if listening windows of terminals waiting for downstream messages have an overlap, - when there is a recovery adapted to the transmission of several downstream messages by the same base station: sending said grouped downward messages in a same window 10 d transmitting said base station within said cover. In particular embodiments, the access network may further comprise one or more of the following characteristics, taken individually or in any technically possible combination.
    [0008] In particular embodiments, when downstream messages are transmitted grouped in the same transmission window of a base station, at least two downgoing messages are transmitted simultaneously on different respective central frequencies. In particular embodiments, the central frequency of a downlink message transmitted in response to a received amount message is determined based on the central frequency, as measured by said access network, of said received amount message. In particular embodiments, when downstream messages are transmitted grouped in the same transmission window of a base station, at least two downstream messages are sent successively. In particular embodiments, each base station is configured to operate by default in a receive mode, wherein said base station may receive upstream messages but can not transmit downstream messages. According to a fourth aspect, the present invention relates to a wireless communication system having a plurality of terminals according to any of the embodiments of the invention and an access network according to any 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 FIGS. 5 which represent: FIG. 1: a schematic representation of a communication system Figure 2: a diagram illustrating the main steps of a wireless communication method, 10 - Figure 3: time diagrams illustrating the principle of the search for overlap between different terminal listening windows, - Figures 4 , 5 and 6: schematic representations of different downlink message grouping strategies in overlapping between different terminal listening windows. 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 25 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).
    [0009] The terminals 20 are adapted to transmit asynchronous upstream messages on a uplink link to the access network 30. By "asynchronously transmit" is meant that the terminals 20 determine autonomously when they transmit, without coordination of said terminals 3033118 10 20 with each other and with the base stations 31 of the access network 30. Each base station 31 is adapted to receive the upstream messages of the terminals 20 which are within range. Each uplink 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 power of said received message amount, the date of receipt of said amount message, etc. The server 32 processes, for example, all the received messages received from the base stations 31.
    [0010] In addition, the access network 30 is also adapted to transmit, via the base stations 31, descendant messages on a downlink to the terminals 20, which are adapted to receive them. The access network 30 may issue a downlink message in response to each received upstream message, or issue downstream messages only in response to certain upstream messages. For example, the access network 30 may respond only after having received a predefined number of upstream messages from the same terminal 20, or responding only to upstream messages comprising a request for this purpose, etc. For reasons of deployment cost of the access network 30, the base stations 31 are of the half-duplex type. In other words, the base stations 31 can receive upstream messages and send down messages, but not simultaneously. Thus, each base station 31 can alternatively be placed in: a reception mode, in which said base station 31 can receive uplinks messages on a reception window but can not transmit descendant messages, a transmission mode, wherein said base station 31 can send down messages on a transmission window but can not receive upstream messages.
    [0011] In the remainder of the description, reference is made in a nonlimiting manner in the case where each terminal 20 is of the synchronous type in reception. In other words, each terminal 20 can receive a downlink message only during a predetermined listening window with respect to the last message sent by said terminal 20. Because they do not have to transmit and receive simultaneously, such terminals 20 are, in preferred embodiments, of the semiduplex type, in order to reduce manufacturing costs.
    [0012] The listening window of a terminal 20 may begin immediately after sending a rising message, particularly if the response times of the access network 30 are short. However, in preferred embodiments, each terminal 20, after having sent a rising message, is configured to go into a standby mode on a predetermined duration watch window also known to the access network 30. In a conventional manner, the standby mode is an operating mode optimized to reduce the power consumption, in which said terminal 20 can not in particular receive messages descending nor issue messages up. For example, the duration of the idle window is chosen to be equal to or greater than the minimum response time of the access network 30. In the remainder of the description, one places oneself in a nonlimiting manner in the case where each terminal 20 is configured to enter sleep mode after sending a rising message. After the idle window, the terminal 20 leaves the idle mode to listen to the downlink waiting for a downward message, on a listening window of predetermined duration. By "duration of the listening window" is meant the maximum duration during which the terminal 20 is configured to listen to the downlink waiting for a message down. Thus, if the terminal 20 receives the downlink message before the end of the listener window, it may stop listening to the downlink at the end of the downlink message, even if the listener window is not over yet. . On the other hand, the terminal 20 listens to the downlink as long as no downstream message has been received and until the listening window is completed. At the end of the listening window, the terminal 30 stops listening to the downlink, even if no downlink has been received. Preferably, the terminal 20 then returns to standby mode, for example until the next upstream message is transmitted. It should be noted that, if a terminal 20 knows, a priori, that no downstream message will be transmitted by the access network 30 (for example because the amount message it sent did not include a request to this effect), then said terminal 20 does not listen to the downlink, and preferably remains in standby mode, for example until the transmission of the next upstream message.
    [0013] Advantageously, the listening window of each terminal 20 is at least five times longer than the duration of the downlink message to be received by said terminal. Such arrangements make it possible to increase the probability of having different terminal listening windows 20 partially overlapping.
    [0014] The longer the duration of the listening window is important, and the greater the probability of recovery increases, so that the duration of the listening windows can be advantageously chosen even greater, for example ten times greater than the duration of the messages descending or more. In the case where all the downstream messages that can be transmitted by the access network 30 have the same duration, then the duration of the listening windows is preferably constant, identical for all the terminals 20. In the case where Different durations of downstream messages are possible, so the duration of a listening window can be adjusted dynamically, for example depending on the known prior duration of the downstream message to be received. In another example, the duration of the listening windows is preferably constant, identical for all the terminals 20, for example chosen at least five times greater than the maximum duration of the messages descending. In the remainder of the description, one places oneself in a nonlimiting manner in the case where all the descendant messages have the same duration, and where all the listening windows have the same duration, invariant over time. For messages descending less than one second, the duration of the listening window is for example chosen between 10 and 30 seconds. FIG. 2 schematically illustrates the main steps of a wireless communication method 50, which is based on the characteristic that the terminals 20 listen to the downlink on a listening window of a duration much longer than the duration of the downstream messages. As illustrated in FIG. 2, when the access network 30 receives a plurality of uplink messages transmitted by different terminals 20, in response to which outgoing messages are to be transmitted, the wireless communication method 50 comprises all of firstly, a step 51 for determining whether listening windows of terminals 20 waiting for downstream messages have an overlap. When there is a recovery adapted to the transmission of several downstream messages by the same base station 31, the method 50 of wireless communication then comprises a step 52 of sending said downlink messages grouped together in the same transmission window. said base station 31, within said cover. In the case (not shown in FIG. 2) where no overlap allowing several downstream messages to be transmitted by the same base station 31 is identified, said downstream messages are for example transmitted in transmission windows different from one another. same base station 31 and / or different base stations 31. Since the listening windows of the terminals 20 are of much greater duration than the duration of the downstream messages, the probability of having an overlap between listening windows adapted to the transmission of several downstream messages by the same base station 31 is increased.
    [0015] When such a recovery is identified, the corresponding downlink messages are advantageously grouped together and transmitted in the same transmission window of said base station 31, thus optimizing the reception availability of the access network 30 because: only one base station 31 is switched into transmission mode to transmit several downgoing messages, so that the other base stations 31 remain available for reception, - only one transmission window is configured, at said base station 31, in order to transmit several downstream messages, so that the unavailability in reception, linked to the switching in the reception mode and the transmission mode, is greatly reduced. The optimization of the reception availability of the access network 30 is, however, accompanied by a slight increase in the electricity consumption of the terminals 20, because of the lengthening of the duration of the windows 3033118 14 compared to the prior art. In general, the access network 30 may consider that downlink messages may be transmitted by the same base station 31 as soon as said base station 31 has received all the upstream messages in response to which these outgoing messages are to be transmitted. . Indeed, the corresponding terminals 20 can then be considered to be within the range of said base station 31. In addition, in order to determine whether an overlap is adapted to the transmission of several downstream messages, the duration of said recovery, in particular, is taken into account. However, the relationship for determining whether this duration is sufficient to transmit several downstream messages depends on the strategy considered for grouping said downstream messages. FIG. 3 diagrammatically represents time diagrams illustrating the progress of step 51 of determining whether different terminal listening windows 15 have an overlap. In the nonlimiting example illustrated in FIG. 3, the duration of the idle windows is considered to be the same for all the terminals. Part a) of FIG. 3 represents a timing diagram associated with a terminal 20-1, illustrating a rising message MM1 transmitted at a transmission instant T1, as well as the listening window AE1 predetermined from said rising message MM1. . More particularly, after sending the rising message MM1, the terminal 20-1 goes into standby mode on a standby window AV1. At the end of the standby window AV1, the terminal 20-1 leaves the standby mode and listens to the downlink on the listening window AE1.
    [0016] Part b) of FIG. 3 represents a timing diagram associated with a terminal 20-2 illustrating a rising message MM2 transmitted at a transmission instant T2. After sending the rising message MM2, the terminal 20-2 goes into standby mode on a standby window AV2, at the end of which said terminal 20-2 listens to the downlink on a listening window AE2.
    [0017] Part c) of FIG. 3 represents a timing diagram associated with a terminal 20-3 illustrating a rising message MM3 transmitted at a transmission instant T3. After sending the rising message MM3, the terminal 20-3 goes into standby mode on a standby window AV3, at the end of which said terminal 20-3 listens to the downlink on the listening window dE3. Preferably, the rising messages MM1, MM2 and MM3 are transmitted on respective central frequencies FM1, FM2 and FM3, for example determined autonomously by the terminals 20-1, 20-2, 20-3.
    [0018] As illustrated by FIG. 3, although the upstream messages MM1, MM2 and MM3 have been transmitted at different transmission times Ti, T2 and T3, the listening windows d1, AE2 and 1E3 have a different overlap. Not insignificant temporal AR. Part d) of FIG. 3 represents a timing diagram illustrating the behavior of a base station 31 which received the upstream messages MM1, MM2 and MM3 during a reception window FR1. Therefore, this base station 31 can transmit MD1, MD2 and MD3 downlinks to the terminals 20-1, 20-2 and 20-3. For this purpose, a transmission window FE of said base station 31 is configured within the AR overlay, for transmitting said downstream messages. The descendant messages MD1, MD2 and MD3 are for example generated by the server 32, and transmitted to the base station 31 to be transmitted on the downlink. As illustrated by part d) of FIG. 3, after sending the downlink messages MD1, MD2 and MD3, a new reception window FR2 is configured for said base station 31. In fact, the base station 31 is preferably configured by default in receive mode, in order to reduce the unavailable time of reception of said base station 31. Consequently, said base station 31 is placed in transmission mode only when at least one downlink message has to be issued.
    [0019] Figures 4 to 6 schematically illustrate nonlimiting examples of downlink message grouping strategies MD1, MD2 and MD3 within the base station FE transmission window 31. In the examples illustrated in FIGS. 6 is non-limiting in the case where the central frequency FD1, FD2, FD3 of each downlink MD1, MD2, MD3 is determined as a function of the central frequency FM1, FM2, FM3 of the rising message MM1, MM2 , MM3. For example, the central frequencies FD1, FD2, FD3 are determined as a function of predefined AF1, AF2, AF3 frequency shifts associated respectively with the terminals 20-1, 20-2, 20-3, according to the following expression: FDi = FMi + AFi (i = 1, 2, 3) Each frequency shift AF1, AF2 and AF3 is for example known a priori of the access network 30 and the corresponding terminal 20-1, 20-2 and 20-3. It should be noted that other matching rules can also be envisaged, since they allow both a terminal 20 and the access network 30 to determine the central frequency of a message descending from the central frequency of an amount message sent by said terminal. It is particularly advantageous to determine the central frequency of the descending message from the central frequency of the uplink message, since the frequency reference of a terminal 20 may be independent of the frequency reference of the base stations 31 (which themselves may be independent of each other). In addition, these frequency references need not be precise since the frequency reference drift is low between the transmission / reception of a rising message and the transmission / reception of the associated downlink message. For example, if the terminal 20-1 sends a rising message MM1 on a central frequency FM1 'which corresponds to (FM1 + b1), b1 corresponding to a bias, then the access network 30, which does not know a priori about which central frequencies the terminals 20 transmit uplinks, detects this rising message MM1 and its center frequency is measured by the access network 30 to a value substantially equal to FM1 '. The terminal 20-1 and the access network 30 both determine the central frequency FD1 'on which the downstream message MD1 must be received / transmitted according to the expression: FD1' = FM1 '+ AF1 = FM1 + AF1 + b1 Thus, even if the accuracy on the central frequency FM1 is low because the bias b1 can be high, the central frequency FD1 'will be substantially the same terminal side 20-1 and access network side 30, in particular because that This is determined on the access network side with respect to the measured center frequency FM1 'of the upstream message MM1. Consequently, inexpensive frequency reference synthesis means can be implemented, in particular in the terminals 20. In the following description, one places oneself in a nonlimiting manner in the case where the frequency offsets AF1, AF2 and AF3 are identical, so that the central frequencies FM1, FM2, FM3 are different, the central frequencies FD1, FD2, FD3 are also. FIG. 4 represents a first example of a grouping strategy in which the downlink messages MD1, MD2, MD3 are grouped together frequently, that is to say, transmitted simultaneously on their respective central frequencies FD1, FD2, FD3. The term "simultaneously transmitted" generally means that said downlink messages have a temporal overlap. In the present case, in the example illustrated by FIG. 4, the downlink messages MD1, MD2, MD3 all have the same duration and are transmitted at exactly the same time of transmission, so that the temporal overlap is total. The duration of the transmission window FE, used to transmit three downlink messages MD1, MD2, MD3, can be reduced to the duration of a single downlink message.
    [0020] Although the terminals 20 transmit asynchronously, that is to say that the upstream messages are most often received at different times by the access network 30, it is nevertheless possible to transmit the downgoing messages simultaneously. thanks to the fact that the listening windows are of much longer duration than the duration of the descendant messages.
    [0021] FIG. 5 represents a second example of a grouping strategy in which the downlink messages MD1, MD2, MD3 are grouped temporally, that is to say sent in succession, without temporal overlap. In such a case, the reduction of the unavailable time of reception of the base station 31 is mainly related to the reduction of the number of switching between reception mode and transmission mode, and to the fact that the difference between two downstream messages successively can be arbitrarily weak. In order to further reduce the downtime during reception, the downlink messages MD1, MD2, MD3 may be transmitted at a rate higher than the rate of the upstream messages, chosen for example so that at least two downstream messages can be transmitted. less than the maximum duration of a rising message. More generally, the use of a downlink bit rate greater than the uplink bit rate, at least for certain downstream messages, may be considered for each of the aggregation strategies. FIG. 6 represents a third nonlimiting example of a grouping strategy in which the downlink messages MD1, MD2, MD3 are grouped together both frequently and temporally. More particularly, the downlink messages MD1 and MD2 are grouped together (transmitted simultaneously on their respective central frequencies FD1 and FD2), and the downlink message MD3 is sent after said downstream messages MD1 and MD2, on the central frequency FD3.
    [0022] The grouping of the downstream messages both frequently and temporally may, for example, be necessary to comply with regulatory constraints in terms of maximum transmission power in the frequency band considered. In such a case, the frequency grouping is preferred as long as the total instantaneous power of the downstream messages grouped together is less than said maximum power. If it is not possible to group all the descendant messages frequentially, then some downstream messages may be grouped together frequently, and the other downstream messages may be sent out later, possibly grouped together among them. It is possible to control the instantaneous power of each downlink message in order to keep it to a minimum and thus maximize the number of downstream messages that can be grouped together frequently. More generally, it should be noted that the modes of implementation and realization considered above have been described by way of non-limiting examples, and that other variants are therefore possible. In particular, the invention has been described by considering a wireless communication system 10 comprising only synchronous terminals 20 in reception. Nothing prevents, according to other examples, coexistence between receiving synchronous terminals 20 and receiving asynchronous terminals, i.e. terminals adapted to receive downlink messages at any time. In such a case, when a downlink message is to be sent to an asynchronous receiving terminal, the method 50 includes steps (not shown in the figures) of: - determining whether said downlink message can be transmitted by a base station 31 provided for transmitting a downlink message 5 in response to a rising message sent by a synchronous terminal 20 in reception, - when said downlink message to the asynchronous terminal in reception can be transmitted by the base station 31 provided for transmitting a downlink message to a synchronous terminal in reception: transmission of said grouped downward messages in the same transmission window of said base station 31.
    权利要求:
    Claims (15)
    [0001]
    CLAIMS1 - Method (50) for wireless communication between a plurality of terminals (20) and an access network (30), said terminals asynchronously transmitting uplink messages on a uplink link to the access network, said an access network being configured to transmit downlink downlink messages in response to all or part of the upstream messages, said access network including a plurality of base stations (31) configured to transmit downstream messages in windows transmission during which said base stations can not receive messages amounts, characterized in that, each terminal waiting for a message down in response to a sent amount message being configured to listen to the downlink on a window of predetermined listening with respect to said amount message, said listening window being of duration at least five times longer than the duration of the message downstream, the method comprises steps of: - (51) determining whether listening windows of terminals waiting for downstream messages have an overlap, - when there is a recovery adapted to the transmission of several downstream messages by a same base station: (52) transmission of said descendant messages grouped in the same transmission window of said base station, within said cover.
    [0002]
    2 - Method (50) according to claim 1, wherein, when downstream messages are transmitted grouped in the same transmitting window of a base station, at least two downstream messages are transmitted simultaneously on different respective central frequencies.
    [0003]
    3 - Method (50) according to claim 2, wherein the central frequency of a descending message transmitted in response to a rising message is determined according to the central frequency of said amount message.
    [0004]
    4 - Method (50) according to one of the preceding claims, wherein, when downstream messages are transmitted grouped in the same transmission window of a base station, at least two downstream messages are issued successively.
    [0005]
    5 - Method (50) according to one of the preceding claims, wherein, when several downstream messages can be grouped together in the same transmitting window of a base station, said downstream messages are grouped frequently by being transmitted simultaneously on respective different central frequencies, as long as the total instantaneous power of said downwardly grouped downward messages is less than a predefined maximum power, then are grouped together temporally by being transmitted successively if said total instantaneous power of said frequentially aggregated downlink messages becomes greater than said maximum power , so that the total instantaneous power remains below said maximum power for the duration of the transmission window. 15
    [0006]
    6 - Method (50) according to one of the preceding claims, wherein, when downstream messages are transmitted grouped in the same transmitting window of a base station, at least one downlink message is transmitted with a higher rate than the rate of the uplink message in response to which said descending message is sent. 20
    [0007]
    7 - Method (50) according to one of the preceding claims, wherein, the wireless communication system also comprising several terminals, called "receiving asynchronous terminals", adapted to receive messages down at any time, said method comprises, when a downlink message is to be sent to an asynchronous terminal in reception, steps of: - determining whether said downlink message can be transmitted by a base station intended to send a downlink message in response to a sent amount message by a terminal, called "synchronous reception terminal", 30 - when said downlink message to the receiving asynchronous terminal can be sent by the base station intended to send a downlink message to a synchronous terminal in reception: transmit said downstream messages grouped together in the same transmission window of said base station.
    [0008]
    8 - Terminal (20) of a wireless communication system (10), said terminal being adapted to transmit uplink messages on a uplink link to an access network (30), said access network being adapted to transmit descendant downlink messages to said terminal in response to all or part of the upstream messages, said terminal being configured to, when it has sent a rising message in response to which the access network is to transmit a downlink message, 10 listen to the downlink, to receive the downward message, on a predetermined listening window with respect to said upstream message, characterized in that the duration of the listening window is at least five times longer than the duration of the descending message.
    [0009]
    9 - Terminal (20) according to claim 8, configured for, when it has sent a rising message in response to which the access network must send a message down, to go into a sleep mode on a window of standby of predetermined duration and, after the idle window, listen to the downlink on the listening window.
    [0010]
    An access network (30) of a wireless communications system (10) comprising a plurality of base stations (31) configured to transmit radio signals in transmission windows during which said base stations can not receive radio signals, characterized in that said system comprising a plurality of terminals (20) according to one of claims 8 to 9, said terminals asynchronously transmitting uplink messages on the uplink, said network The access is configured to: - determine whether listening windows of terminals waiting for downstream messages have an overlay, - when there is a recovery adapted to the transmission of several downstream messages by the same base station: transmitting said grouped downlink messages in the same transmission window of said base station within said overlay. 3033118 23
    [0011]
    Access network (30) according to claim 10, wherein, when downstream messages are transmitted grouped together in the same transmission window of a base station, at least two downstream messages are transmitted simultaneously on central frequencies. respective 5 different.
    [0012]
    An access network (30) according to claim 11, wherein the central frequency of a downlink message transmitted in response to a received amount message is determined according to the central frequency, measured by said access network, of said received amount message. 10
    [0013]
    13 - access network (30) according to one of claims 10 to 12, wherein, when downstream messages are sent grouped in the same transmission window of a base station, at least two downstream messages are issued successively.
    [0014]
    The access network (30) according to one of claims 10 to 13, wherein each base station is configured to operate by default in a receive mode, wherein said base station may receive upstream messages but can not send outgoing messages.
    [0015]
    15 - System (10) for wireless communication, characterized in that it comprises a plurality of terminals (20) according to one of claims 8 to 9 and an access network (30) according to one of the claims 10 to 14.
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    同族专利:
    公开号 | 公开日
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    法律状态:
    2016-02-26| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-26| PLSC| Publication of the preliminary search report|Effective date: 20160826 |
    2017-02-28| PLFP| Fee payment|Year of fee payment: 3 |
    2018-02-28| PLFP| Fee payment|Year of fee payment: 4 |
    2020-02-28| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-12| ST| Notification of lapse|Effective date: 20211005 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1551394A|FR3033118B1|2015-02-19|2015-02-19|METHOD AND SYSTEM FOR WIRELESS COMMUNICATION BETWEEN TERMINALS AND SEMI-DUPLEX BASE STATIONS|FR1551394A| FR3033118B1|2015-02-19|2015-02-19|METHOD AND SYSTEM FOR WIRELESS COMMUNICATION BETWEEN TERMINALS AND SEMI-DUPLEX BASE STATIONS|
    AU2016221526A| AU2016221526B2|2015-02-19|2016-02-19|Method and system for wireless communication between terminals and half-duplex base stations|
    ES16713516T| ES2729448T3|2015-02-19|2016-02-19|Procedure and wireless communication system between terminals and semi-duplex base stations|
    EP16713516.9A| EP3259855B1|2015-02-19|2016-02-19|Method and system for wireless communication between terminal and base stations half-duplex|
    PCT/FR2016/050383| WO2016132081A1|2015-02-19|2016-02-19|Method and system for wireless communication between terminals and half-duplex base stations|
    CN201680010858.3A| CN107431951B|2015-02-19|2016-02-19|Method and system for wireless communication between a terminal and a half-duplex base station|
    JP2017543961A| JP6620161B2|2015-02-19|2016-02-19|Method and system for wireless communication between a terminal and a half-duplex base station|
    BR112017017519-3A| BR112017017519A2|2015-02-19|2016-02-19|Method and system for wireless communication between terminals and half-duplex base stations|
    KR1020177024834A| KR102366565B1|2015-02-19|2016-02-19|Method and system for wireless communication between a terminal and a half-duplex base station|
    US15/551,155| US10333665B2|2015-02-19|2016-02-19|Method and system for wireless communication between terminals and half-duplex base stations|
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