Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0209—Power saving arrangements in terminal devices
  • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
  • H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower where the power saving management affects multiple terminals
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L12/00—Data switching networks
  • H04L12/02—Details
  • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0209—Power saving arrangements in terminal devices
  • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
  • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0209—Power saving arrangements in terminal devices
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0209—Power saving arrangements in terminal devices
  • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
  • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
  • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal where the received signal is a power saving command
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
  • Y02D30/00—Reducing energy consumption in communication networks
  • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

• the field of the invention is that of radio wireless telecommunications networks, and more particularly nodes of such a network, subject to energy consumption constraints, such as sensor nodes.
• the receiving node becomes unable to detect a received data signal during a sleep period, since it is then inactive.
• a disadvantage is that it generates a regular and heavy signaling, thus consuming energy
• This second option is often chosen because of the simplicity of its implementation. However, it suffers from a major drawback: the very short waking period of the receiver is a moment of great vulnerability.
• any phenomenon occurs, for example type interference or fading ("fading" in English), the receiver does not detect the preamble announcing the data that are intended for it and they are completely lost.
• the listening period of the preamble necessarily takes place on the same radio channel, unique for the entire network, the signaling channel. If this channel is permanently interfered with, no communication with the interference nodes is possible.
• While transmission of the useful part of the frame can benefit from error correction and / or diversity, for example by means of a frequency hopping transmission method, in order to correct the error. impact of interference or fading, the transmission of the preamble itself is not protected in any way.
• the transmission of the preamble is therefore more fragile than that of the useful data.
• the invention improves the situation by means of a method for treating the receiving a communication signal in a communication network comprising a plurality of nodes alternately respecting periods of sleep and waking periods, a transmitting node preceding the transmission of data to a destination node of a step transmitting a preamble longer than a sleep period of the destination node.
• a plurality of at least two transmission channels having been defined between the nodes for the transmission of said preamble said method comprises the following steps:
• a receiving node selects the transmission channel that it will listen and it can decide to change the transmission channel on detection of a triggering event likely to affect its operation.
• the invention is based on a completely new and inventive approach to the transmission of a transmission signal. Indeed, it provides the receiving node with the autonomy needed to unilaterally decide to change the signaling channel when it deems it necessary. This allows it to satisfy its own operating constraints, without generating additional signaling and therefore without impacting the transmitter.
• said at least one triggering event belongs to the group comprising at least:
• the trigger events listed are related to constraints of operation of the receiving node. More precisely, such events prevent the satisfaction of these constraints.
• Observing a constraint relating to the level of noise detected on the signaling channel makes it possible to guarantee a level of reception quality of the preamble, while preserving the energy resources of the receiving node. Indeed, a receiving node unnecessarily spends resources when it has to process a large amount of noise on the signaling channel.
• the value of the noise threshold varies of course according to the characteristics of the network and the transmission mode used.
• the method according to the invention comprises a step of determining a noise level, comprising the following steps:
• a receiver node comprises means for detecting the energy of the signals received on the signaling channel and means for processing the detected energy in order to evaluate whether it is truly a signal of communication or false detection.
• the invention proposes to use the information provided by such energy detection means to determine a noise level present on the signaling channel.
• a predetermined threshold the value of which depends at least on the application and the transmission mode used
• the receiving node considers that the signaling channel has a noise level that is too high for respond to the operating constraints he has set himself. It is therefore in the presence of an event triggering a change of listening channel of the preamble.
• the receiving node and the destination node having defined one of the plurality of channels, said main channel is selected as the preamble listening channel and the channel changing step is triggered only when in case of detection of a noise level higher than the predetermined noise threshold.
• the sending and receiving nodes have agreed on the use of a transmission channel as the main signaling channel.
• the receiving node therefore decides to change the signaling channel only if the noise level is too high, for example due to interference or fading.
• a first advantage of this embodiment is to be simple, pragmatic and energy efficient for the receiving node that does not spend its energy resources to change the transmission channel.
• Another advantage of this embodiment is that it does not impose an extension of the duration of the preamble, since the receiving node operates under conditions similar to those of the prior art. This is very advantageous in a normal situation, but leads to increased latency in case of interference on the transmission channel.
• This first embodiment is therefore well suited to networks supporting high traffic or operating in a rarely interfered environment.
• a channel change decision is initiated at the beginning of a new waking period and in that the transmission channel is selected from the N transmission channels according to a predetermined listening order.
• the receiving node selects a new signaling channel at the beginning of the waking period. At each new waking period, it listens to another channel of the plurality of channels, according to a predetermined listening order.
• a first advantage of this embodiment is securing the transmission of the preamble, which is not transmitted each time on the same channel.
• a second advantage is a better responsiveness of the receiving node when the sending node transmits the preamble over several channels at a time, since it periodically listens each of the transmission channels defined with the other nodes of the network as potential signaling channels.
• This solution therefore has the advantage of low latency, because in the event of a transmission-type interference problem on the signaling channel, the time required for the transmitter and receiver nodes to be on another transmission channel is minimal.
• This second embodiment makes it possible to maintain an unchanged reactivity of the system with respect to the prior art. Because of the long preamble, this embodiment of the invention is well suited to networks with low traffic or operating in unstable conditions.
• the receiving node observes an alternation of a waking period and a sleep period.
• N successive awakening periods follow N successive sleep periods.
• This device may of course include the various characteristics relating to the method of processing the reception of a communication signal according to the invention.
• such a device can be integrated into a receiving node.
• the invention further relates to a method of processing the transmission of a communication signal in a communication network comprising a plurality of nodes alternately respecting sleep periods and waking periods, a transmitter node preceding the sending data to at least one destination node of a step of transmitting a preamble of length at least equal to a sleep period of the destination node, characterized in that, a plurality N of at least two transmission channels having been defined between the transmitting node and the at least one destination node, said method comprises the following steps:
• Such a method is intended to be implemented by a transmitting node.
• the transmitter node selects at least one transmission channel on which to emit the preamble of the communication signal that it wishes to transmit to the destination node. Like the receiving node, it can decide to change the transmission channel upon detection of a triggering event.
• the sender node also has a certain autonomy to ensure optimal operation, particularly in terms of resource management energy and quality of service.
• the transmission event belongs to the group comprising:
• Triggering events include a repeated failure to transmit the preamble.
• the sender node concludes with such a failure, when at the end of a certain number of retransmissions of the preamble on the same channel, it has still not received an acknowledgment message from the destination node. He then considers that he is unnecessarily spending energy trying to communicate with the destination node on a transmission channel that he is not listening to and decides to switch to another transmission channel.
• the invention thus allows it to optimize the consumption of its energy resources while guaranteeing the quality of service.
• Another triggering event is the noise level present on the current transmission channel.
• the transmitting node when it exceeds a predetermined noise threshold, the transmitting node considers that the security of the transmission of the preamble is no longer guaranteed on this channel and it triggers a change of transmission channel for the transmission of the preamble . This allows the sending node to preserve the quality of service and the security of the communication with the destination node.
• the transmitter node having previously defined a main transmission channel with the receiving node, said main channel is selected as the listening channel.
• the transmitting node always transmits the preamble on the same transmission channel and only changes it when a transmission event that is likely to jeopardize its transmission constraints occurs.
• An advantage of this embodiment is to be simple, pragmatic and energy efficient.
• the selection step consists of selecting the plurality of transmission channels for simultaneous transmission of the preamble over the plurality of channels and in that, upon detection of a transmission event on one of said channels, the channel change decision step decides to stop the transmission of the preamble on said channel.
• the sending node starts by transmitting simultaneously on the plurality of channels defined with the receiving node. It can decide to stop transmitting on one of the channels upon detection of a transmission event.
• Such a transmitting node therefore necessarily has transmission capacities and therefore energy resources greater than those of a conventional sensor node, which can transmit only on one transmission channel at a time.
• This embodiment advantageously applies to a transmitting node which intends in communication signal to a plurality of destination nodes.
• a transmitting node which intends in communication signal to a plurality of destination nodes.
• a hub node able to collect measurement signals from a plurality of sensor nodes.
• Such a node may be required to transmit data, e.g., control messages to a plurality of sensor nodes, said messages including physical data collection instructions.
• An advantage of this embodiment is that it allows the transmitting node to reach as quickly as possible all the destination nodes according to the invention. Indeed, not knowing which channel of transmission they are listening, it is interesting to emit simultaneously on all the channels.
• Another advantage of this embodiment is that it gives the opportunity to the transmitting node to stop the transmission on a transmission channel that no longer responds to its operating constraints, for example because it is noisy. Thus, it does not unnecessarily spend its energy resources and ensures the security of the data it transmits.
• the invention further relates to a device for processing the transmission of a communication signal capable of implementing the transmission method which has just been described.
• This device may of course include the various features relating to the method of processing the transmission of a communication signal according to the invention.
• the invention also relates to a node comprising a transmitting device and a receiving device according to the invention.
• the invention further relates to a communication network comprising at least two nodes according to the invention.
• such a network comprises a node according to the invention, which is also able to transmit simultaneously on the plurality of channels.
• a node according to the invention which is also able to transmit simultaneously on the plurality of channels.
• This is for example a concentrator node,
• the invention also relates to a computer program comprising instructions for implementing a method of processing the reception of a communication signal as described above, when this program is executed by a processor.
• a program can use any programming language. It can be downloaded from a communication network and / or saved on a computer-readable medium.
• the invention relates to a computer program comprising instructions for implementing a method of processing the transmission of a communication signal as described above, when the program is executed by a processor.
• a program can use any programming language. It can be downloaded from a communication network and / or recorded on a computer readable medium.
• Figure 1 schematically shows a radio communication network comprising a plurality of nodes according to the invention
• FIG. 2 schematically shows the steps of the method of receiving a communication signal in such a network according to the invention
• FIG. 3 schematically shows the steps of the method for transmitting a communication signal in such a network according to the invention
• FIGS. 4A, 4B and 4C illustrate three examples of implementation of channel listening alternation according to the invention
• FIG. 5 schematically shows the exchanges between a transmitting node and a receiving node according to a first embodiment of the invention
• FIG. 6 schematically shows the exchanges between a transmitting node and a receiving node according to a second embodiment of the invention
• FIG. 7 schematically shows the exchanges between a transmitting node and a receiving node according to a third embodiment of the invention.
• FIG. 8 shows an exemplary structure of a transmitter / receiver node, comprising a device for transmitting a communication signal and a reception device according to the invention.
• a network R of radio communications comprising a plurality of nodes Nd1, Nd2, Nd3 subject to power consumption constraints. This is for example sensors, able to perform physical measurements of their surroundings and transmit to a hub node Nd ⁇ -
• the nodes Ndi, Nd 2 , Nd 3 of the network R communicate by radio for example by a technology of Ultra Wide Band type ("Ultra Wide Band", UWB in English).
• the invention is not limited to this example and applies to any communication between two nodes of a radio communication network according to Zigbee or other type of technology, provided that the nodes are subject to constraints. of energy consumption.
• Such sensor nodes generally battery-powered, may not be accessible to change the battery, for example by being buried, integrated into walls of a building or embedded in a vehicle. It is therefore a question of ensuring them the longest possible autonomy of operation, by saving the energy resources that their battery makes available to them. For this, it is necessary to minimize the activity rate of the node, which is to maintain most of the time off.
• the simplest solution to achieve this is to subject the node to an alternation of periods of awakening and sleep, the duration T w of the waking period is minimal compared to that of the sleep period T s .
• the general principle of the invention is based on the definition of a plurality of transmission channels between a transmitting node and a receiving node and on the possibility for a receiving node to change listening channel on detection of a triggering event likely to affect at least one of its operating constraints.
• two transmission channels Chn c and Ch 12c defined between the concentrator node Nd C o and the sensor node Ndi are considered, two transmission channels Ch 2 i c , Ch 22c defined between the concentrator node. Nd C o and the Nd 2 sensor node and two transmission channels Ch 31c and Ch 32c defined between the node concentrator Nd C o and sensor node Nd 3 .
• Two transmission channels Ch 12 , Ch 22 are also considered between the sensor node Ndi and the sensor node Nd 2 .
• the steps of the method for processing the reception of a communication signal by a receiver node B are now presented.
• the communication signal is transmitted by a sending node A, for example Nd ⁇ or Ndi to a receiving node.
• N 2 channels, this number to achieve a good compromise between reliability and latency.
• Node A shall transmit a communication signal to Node B comprising a preamble Pr and a data frame Tr.
• N 2 transmission channels Chu, Ch 2 may be used as signaling channel.
• the receiver node B selects from among the channels C and Ch 2 a transmission channel, to listen for the reception of a Pr preamble Pr of a communication signal S.
• the selected channel, said current signaling channel Ch c is for example equal to Chi.
• the receiver node B therefore begins to listen to the channel CH c selected in RI.
• a preamble Pr is received on the current channel Ch c .
• This reception step triggers the implementation of a step R3 for detecting EVT triggering events that may affect at least a predetermined operating constraint of the receiving node B.
• the events taken into consideration can be of different types. These can be simple temporal events, which occur periodically, such as for example a start of a new waking period for the sending node A. Node A is indeed subject to periods of awakening and awakening. sleep.
• a first operating constraint may be for him to change the signaling channel at each new waking period, so as to ensure increased robustness compared to interference.
• a second operating constraint relates to a noise threshold beyond which the main transmission channel is no longer considered to satisfy the quality of service and safety requirements for the transmission of a preamble.
• Such a step R3 then comprises a step of detecting a noise level received on the main channel, which implements energy detection means natively present in a node of a radio communication network.
• Such means are able to detect a quantity of energy received on the current channel and to compare it with a threshold of energy beyond which the radio reception means of the node are activated to search for a presence of useful signal on the channel.
• the radio reception means are indeed natively configured to distinguish the useful signals from the false detections. It is thus possible to obtain information relating to a number of false detections received per unit of time. During step R3, this number is compared to a threshold number corresponding to said noise threshold.
• Such false detections may originate from other radio transmitting nodes that transmit on the same channel (intentional interference) or spurious signals generated by the activity of other nodes on neighboring transmission channels (unintentional interference).
• a signaling channel change is decided by the receiving node B during a step R4.
• the new listening channel for receiving a preamble is selected from the N channels of transmissions previously defined with the transmitter node A, according to a predetermined rule, during a new implementation of the step R0.
• N being equal to 2
• the new current signaling channel chosen is necessarily the Ch 2 channel.
• the implementation of the method then resumes at the listening stage RI which is this time on the Chi channel.
• step R5 When node B has established, following receipt of the preamble Pr that the useful data of the communication signal S were intended for him, he initiates a step R5 of receiving the useful data frame Tr of the signal S on a channel Ch T according to a transmission scheme previously defined between the node A and node B.
• the data frame is transmitted on the transmission channel that the receiving node is listening, namely the Ch c channel.
• the transmission of the Tr frame can start on the signaling channel Ch c and continue on a sequence of transmission channels among the N channels defined between the sending and receiving nodes. It is also possible to dedicate a channel to the transmission of useful data.
• node B may decide to go back to sleep.
• an acknowledgment message Ack is sent by the node B, during a step R6, to the node A on the signaling channel current Ch c .
• the transmitter node A selects at least one transmission channel, called the current signaling channel Ch c , on which to emit the preamble Pr. In El, it transmits the preamble Pr to the node B on said at least one current channel Ch c , for example equal to Chi.
• the sending node sends the transmission of the preamble Pr by sending the data frame Tr on a transmission channel Ch T according to a communication scheme previously defined with the destination node.
• step E2 the method starts, in a step E5 awaiting reception of an acknowledgment message Ack from the destination node B, on the current signaling channel Chc.
• the node A triggers a step E3 for detecting trigger events that may affect at least one of its predetermined operating constraints.
• Such a step is implemented in a manner similar to step R3 previously described for the reception method.
• triggering events at least two types can be considered:
• a transmitting node is generally also receiver. It therefore comprises the energy detection means and the radio reception means previously described and natively integrated with its reception means.
• the transmitting node can thus obtain from its reception means information relating to a number of false detections received per unit time on the current channel and compare them to a noise threshold. If the noise threshold is exceeded, the quality of service can no longer be guaranteed on the current channel. It should be changed;
• a signaling channel change decision decision is made at E4.
• Another transmission channel among the N defined with the destination node is chosen.
• N being equal to 2
• the chosen channel is necessarily the Ch 2 channel.
• the transmitting and receiving nodes can advantageously agree beforehand on an order of passage of the N channels of transmission.
• the step of selecting a signaling channel takes into account the agreed order of passage.
• the node A and the node B have previously defined a main signaling channel Ch P equal to C u and a secondary signaling channel equal to Ch 2 .
• the node B preferentially listens to the signaling channel Ch and decides to change it only on detection of a noise level higher than a predetermined noise threshold.
• the node A emits preambles of duration T P greater than a sleep period T s .
• the duration of the preamble does not therefore need to be lengthened.
• node B If a high noise level has forced node B to switch its listening on the secondary channel before receiving the preamble on the main signaling channel Ch P , then node A will have to re-transmit the preamble on the secondary channel, as soon as that it will have detected the absence of an acknowledgment-acknowledgment message from the destination node B.
• the node B observes a listening alternation between the transmission channels Chi and Ch 2 in a period equal to a complete cycle Cy comprising a sleep period S and an awakening period E. At each new period wake up, it selects a new signaling channel and so switches its listening from one transmission channel to another.
• Node B observes a sequence of sleep and waking periods, including a sleep period S followed by N waking periods. During the N successive periods of awakening, he listens successively on the N transmission channels defined with the node A in a predetermined order of passage. This results for the node A that the preamble it emits must have a length at least equal to two complete cycles, as in the previous example.
• FIG. 5 a diagram of the flows exchanged between the sending node A and the receiving node B according to a first embodiment of the invention is presented.
• the nodes A and B operating according to an exchange mode said of equals.
• This mode is particularly well suited to two nodes equipment, for example sensors, which have an equivalent level of resources, whether in terms of energy, calculation or radio transmission / reception capabilities.
• the nodes A and B have defined in common a principal signaling channel Ch equal to Chi, but that at least since the time t 0 + T s , the node B has decided to fall back on the secondary channel Ch 2 following the detection of a trigger event Evt relating to a noise level that is too high on the ChP channel.
• the node A which wishes to transmit a communication signal to the node B, ignores the channel change of the node B. It therefore selects the main signaling channel Ch and begins to issue a Pr preamble on this channel, of length T greater than T s . It then transmits the data frame Tr on a transmission channel Ch T according to a transmission scheme defined with the node B.
• this transmission channel is not necessarily the same as the signaling channel Ch. It is specified by the transmission scheme defined between the nodes and depends in particular on the transmission mode used.
• Node A is waiting for an acknowledgment message during Del delay. Since node B listens to the transmission channel Ch 2 , it has not received Pr preamble and therefore does not react. At the end of delay Del, node A has not always received any acknowledgment message on the main channel Chi. He therefore decides to reissue Pr preamble a second time on the main channel Ch P. At the end of a number K of retransmissions, with K greater than or equal to 2, without response on the main channel Ch, the node A decides to switch to the secondary channel Ch 2 .
• K is chosen equal to 2.
• the node A thus emits the preamble Pr on the channel Ch 2 , then transmits the data frame Tr on the channel Ch T. It is then placed in the expectation of a reception message within Del delay.
• Node B wakes up during the duration of the preamble, listens to the Ch 2 channel, detects the preamble and extends its waking period until it has received Pr preamble in its entirety. It then activates its radio reception means on the channel Ch T according to the transmission scheme agreed with the node A, to receive the frame Tr of useful data announced by the preamble Pr. At the end of this reception, it transmits an acknowledgment message Ack on the channel of signaling Ch 2 . Node A receives it within the Del delay and terminates the transmission of the communication signal.
• FIG. 6 a diagram of the flows exchanged between a transmitting node A and a receiving node B according to a second embodiment of the invention is now presented.
• the nodes A and B operating according to a variant of the peer-to-peer exchange mode:
• Node B alternately listens to the transmission channels Chu and Ch 2 in a period equal to a cycle Cy. At each new waking period, it switches from one channel to another.
• node A begins to issue a preamble Pr on the channel Ch 1; while node B has switched on channel Ch 2 .
• node A To be assured of receipt of Preamble Pr by node B, node A must issue a preamble of duration T satisfying the following condition:
• N is the number of transmission channels defined between the sending node and the receiving node, T s being the sleep period, T w the waking period of the receiving node B.
• the node B If the node B has established following receipt of the preamble Pr that the data were intended for it, it is placed in FL, on the channel Ch T , defined according to the scheme of transmission of useful data agreed with the node A, to receive the Tr using data frame At the end of this reception, it transmits on the Ch 1 channel ; an acknowledgment message to node A. The latter receives it at E5 and terminates the procedure for transmitting the communication signal.
• FIG. 7 a diagram of the flows exchanged between a transmitting node A and a receiving node B according to a third embodiment of the invention is now presented.
• Node A is a concentrator node which has means for simultaneously transmitting a Pr preamble on the N transmission channels.
• Node B is considered to have selected, from among the N transmission channels previously defined with the node A, a current signaling channel Chc, for example equal to Chi, which it listens during its waking periods. It does not decide to change as long as the latter responds to its operating constraints, in particular that it does not generate a noise level higher than a predetermined noise threshold.
• Node A thus emits the preamble Pr of duration T P > T s , simultaneously on the channels Chi and Ch 2 , from a time t 0 . It is assumed that at this moment, Node B is in a sleep period.
• Node B wakes up at time t 0 , during transmission of the preamble on the Chi channel. It detects a sufficient level of energy on the Chi channel, which triggers its means of radio reception, in RI. It is kept awake until the end of the reception of preamble Pr. Then, in accordance with the parameters of the preamble received, when the data are intended for it, it prepares for the reception of the frame Tr of useful data on the transmission channel. Ch T. At the end of this transmission, it sends an acknowledgment message Ack on the signaling channel Chi. He can then go back to sleep.
• Node A receives the acknowledgment message Ack on the Chi channel and terminates the procedure.
• an Nd node comprising a reception processing device 100 and a transmission processing device 200 respectively implementing a transmission method and a reception method according to one of the embodiments described above.
• the device 100 comprises a processing unit 110, equipped for example with a processor P, and driven by a computer program Pgl 120, stored in a memory 130 and implementing the method of processing the reception of a communication signal according to the invention.
• a processing unit 110 equipped for example with a processor P, and driven by a computer program Pgl 120, stored in a memory 130 and implementing the method of processing the reception of a communication signal according to the invention.
• the code instructions of the computer program Pgl 120 are for example loaded into a RAM before being executed by the processor of the processing unit 110.
• the processor of the processing unit 110 sets implement the steps of the method of processing the reception of a communication signal described above, according to the instructions of the computer program 120.
• the node Nd comprises means 300 for detecting a quantity of energy received on the selected signaling channel, radio reception means capable of being activated when a sufficient quantity of energy has been received on the channel signaling. These means are controlled by the processor of the processing unit 110.
• the processing unit 110 obtains from such means information relating to an energy level detected on the energy signaling channel or to a false detection. It uses them, according to the instructions of the computer program Pgl 120 to implement the steps of the method in question, such as the step of detecting a trigger event such as the presence of a noise level greater than a predetermined noise threshold.
• the device 200 includes a processing unit 210, equipped for example with a processor P, and controlled by a computer program Pg 2220, stored in a memory 230 and implementing the treatment method of the transmission of a communication signal according to the invention.
• a processing unit 210 equipped for example with a processor P, and controlled by a computer program Pg 2220, stored in a memory 230 and implementing the treatment method of the transmission of a communication signal according to the invention.
• the code instructions of the computer program Pg 2 220 are for example loaded into a RAM memory before being executed by the user.
• the processor of the processing unit 210 implements the steps of the method of processing the transmission of a communication signal described above, according to the instructions of the computer program 220.
• the means 300 for detecting a quantity of energy received on the selected signaling channel and the radio reception means of the node N are controlled by the processor of the processing unit 210. input information from said means and it uses them, according to the instructions of the computer program Pg2 220 to implement the steps of the method of processing the transmission of a communication signal in question, for example in the course of the step of detecting a trigger event related to the presence of a noise level higher than a predetermined noise threshold.
• the processing unit 210 receives as input information from said means, for example information relating to the detected noise level.
• commands to said transmission / reception means 400 for example a signaling channel change command Ch c for the transmission of the preamble Pr on the current signaling channel Ch c to the node B.

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• 2012
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  • 2013-03-28 EP EP13720438.4A patent/EP2832158A1/de not_active Withdrawn
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