Patent Application
20240129160
The present disclosure relates to the field of data exchanges, particularly on board an aircraft, and aims more particularly a two-way communication method between different communicating devices of a two-way communication system, in particular an embedded two-way communication system.
Safety and reliability are major concerns in the design of an aircraft. Thus, it is essential to ensure the integrity of some types of measurement data, considered critical for piloting or involved in the management of the flight of the aircraft. These data include those relating to the positioning of the aircraft or those relating to the remaining amount of fuel.
These data are generally transmitted by sensors to computers, by means of an embedded network. Conversely, a computer can transmit a flight command to actuators, via such an embedded network.
To meet these needs, there is known a communication architecture that allows a plurality of equipment to emit and/or receive data via a trusted switched redundant Ethernet network, also known by the acronym AFDX™ for “Avionics Full Duplex Switched Ethernet”.
Such equipment can be sensors transmitting measurement data to embedded computers, actuators receiving setpoint data from such computers or embedded computers communicating with each other.
The AFDX™ network is based on Ethernet technology using, for the physical layer or physical transceiver part, standard commercial components, also known by the acronym COTS for “Commercial Off-The-Shelf”.
The AFDX™ network has been standardized in the ARINC 664 standard, which defines how ready-to-use commercial network components are used for aeronautical data networks, also known under the acronym ADN for “Aircraft Data Network”. It is simply recalled that the AFDX™ network is full-duplex, deterministic and redundant.
Dual-channel, or Full Duplex, aeronautical communications are generally implemented based on 10/100Base-T Ethernet standards defining for an AFDX™ network, the use of a cable made up of 2 twisted pairs, for example of the quad type, for a Full Duplex operation, one twisted pair being used per direction of propagation, and of a contact adapted to such a cable configuration, for example of the quadrax type. Subsequently, this type of cable will be referred to as two pair cable.
On such a network, the physical data flow rate obtained is 10 Mbps or 100 Mbps per direction of propagation on the physical link, in particular on the twisted pair.
However, the volume of information and the overall need for performance of the flight control system or of the systems associated with the flight management being constantly increasing, it is necessary for the communication links to offer higher flow rates and lower latencies that the existing offer does not propose.
More recently, a type of Ethernet transceiver supporting new single pair Ethernet physical layers, such as 10Base-T1, has been developed, in particular for the automotive field, the 100Base-T1 or 1000Base-T1 allowing full duplex data transmission over a single twisted pair.
There is therefore a need to be able to use such transceivers in the current architecture of an embedded network of an aircraft in order to support more advanced physical layers, with the standard commercial wirings and connectors of an aircraft, in particular those of an AFDX™ network, in order to have a reliable, secure, higher flow rate and/or more compatible integrity data link.
The disclosure meets such a need and proposes for this purpose a method allowing the use of Ethernet transceivers supporting the single pair Ethernet physical layers such as 10Base-T1, 100Base-T1 and 1000Base-T1 for data exchanges on board an aircraft.
According to a first aspect, this aim is achieved by a two-way data communication method of a two-way data communication system, in particular an embedded two-way data communication system comprising:
the first connector of the first communicating device being linked to the second connector of the second communicating device by an inter-device link, in particular a two pair link, characterized in that the method comprises:
Advantageously, the proposed method makes it possible to fully use the current wirings and connectors in order to obtain communication interfaces with higher flow rate or greater integrity. Thus, in comparison with an AFDX™ data network, the method makes it possible to double the transmission flow rates.
The disclosure may advantageously completed by the following characteristics, taken individually or in any one of their technically possible combinations:
According to a second aspect, it is proposed an embedded two-way communication system, comprising at least a first communicating device and a second communicating device configured for the implementation of a method according to any of the preceding claims.
Of course, the different characteristics, variants and/or embodiments of the invention may be associated with each other in various combinations insofar as they are not incompatible or exclusive of each other.
The disclosure will be better understood and other characteristics and advantages will become apparent upon reading the following detailed description comprising embodiments given by way of illustration with reference to the appended figures, presented by way of non-limiting examples, which may be used to complete the understanding of the disclosure and the disclosure of its embodiment and, if necessary, contribute to its definition, on which:
It should be noted that, in all the figures, the structural and/or functional elements common to the different embodiments may have identical references. Thus, unless otherwise stated, such elements have identical structural, dimensional and material properties.
The two-way data communication system 100 includes at least one communicating device 200, particularly a plurality of communicating devices, in particular a first communicating device 200a and a second communicating device 200b, connected together in order to exchange data via an Ethernet-type network.
The communicating device 200 includes a first physical link management module 231 and a second physical link management module 232, implementing a lower-level protocol, that is to say the physical layer of the OSI (Open Systems Interconnection) model according to the corresponding communication standard.
Particularly, the first communicating device 200a includes a first physical link management module 231a and a second physical link management module 232a and the second communicating device 200b includes a first physical link management module 231b and a second physical management module link 232b, respectively implementing a lower-level protocol.
The first physical link management module 231, respectively the second physical link management module 232, includes a transceiver supporting the single pair Ethernet standards, also referred to by the acronym SPE for “Single Pair Ethernet”, such as as 10Base-T1, 100Base-T1 or 1000Base-T1.
The transceiver is known, particularly in the automotive field. The single pair Ethernet standards, such as 10 Base-T1, 100Base-T1 or 1000Base-T1, are dedicated to transporting 10 Mbit/s, 100 Mbits/s or 1 Gbits/s Ethernet frames in full duplex and point-to-point over a single twisted pair, instead of the usual two or four pairs.
The first physical link management module 231, respectively the second physical link management module 232, includes a transceiving port (not represented) connected to a different physical Ethernet link, of the single pair link type, for example in the form of a twisted single pair cable.
The first physical link management module 231, respectively the second physical link management module 232, is responsible for generating and analyzing the physical signals which transit over their physical Ethernet links.
The communicating device 200 also includes a connector 403, particularly a first connector 403a of the first communicating device 200a and a second connector 403b of the second communicating device 200b.
The connector 403 of the communicating device 200 is linked to the first physical link management module 231 and to the second physical link management module 232 of the communicating device 200 by a first connector-module link 401 and a second connector-module link 402. The first connector-module link 401 and a second connector-module link 402 are preferably of the Ethernet type.
Specifically, the first connector 403a of the first communicating device 200a is linked to the first physical link management module 231a and to the second physical link management module 232a of the first communicating device 200a by a first connector-module link 401a and a second connector-module link 402a, preferably single pair links.
Similarly, the second connector 403b of the second communicating device 200b is linked to the first physical link management module 231b and to the second physical link management module 232b of the second communicating device 200b by a first connector-module link 401b and a second connector-module link 402b, preferably second single pair links.
The first communicating device 200a and the second communicating device 200b thus communicate with each other, in particular via the first physical link management module 231a and the second physical link management module 232a of the first communicating device 200a and the first physical link management module 231b and the second physical link management module 232b of the second communicating device 200b.
The connector 403a of the first communicating device 200a is linked to the connector 403b of the second communicating device 200b, by an inter-device link 404, particularly an inter-device link 404 of the two pair type, for example in the form of a twisted two pair cable, particularly expandable to four twisted pairs.
The frames emitted or received on the first physical link management module 231a, respectively the second physical link management module 232a, are transmitted quasi-simultaneously or with a small time lag between the first communicating device 200a, respectively the second communicating device 200b.
The communicating device 200 also includes a packet management module 220, particularly a first packet management module 220a of the first communicating device 200a and a second packet management module 220b of the second communicating device 200b.
The packet management module 220 is linked to the first physical link management module 231 and to the second physical link management module 232. This allows a two-way communication between the physical Ethernet layer and higher-level protocol layers 210.
More particularly, on the one hand, the first packet management module 220a of the first communicating device 200a is linked to the first physical link management module 231a and to the second physical link management module 232a of the first communicating device 200a. On the other hand, the second packet management module 220b of the second communicating device 200b is linked to the first physical link management module 231b and to the second physical link management module 232b of the second communicating device 200b.
Data buses 241 and 242 ensure the two-way transmission of data between the packet management module 220 and the first physical link management module 231 and the second physical link management module 232.
Thus, on the one hand, data buses 241a and 242a ensure the two-way transmission of data between the first packet management module 220a and the first physical link management module 231a and the second physical link management module 232a of the first communicating device 200a. On the other hand, data buses 241b and 242b ensure the two-way transmission of data between the second packet management module 220b and the first physical link management module 231b and the second physical link management module 232b of the second communicating device 200b.
The data bus 241a, 242a, 241b and 242b ensure the two-way data transmission generally meets the IEEE MII acronym for “Media Independent Interface” standard or RMII acronym for “Reduced Media Independent Interface”.
However, other standards may be used, such as GMII acronym for “Gigabit Media-Independent Interface”, RGMII acronym for “Reduced Gigabit Media Independent Interface”, SGMII acronym for “Serial Gigabit Media Independent Interface”, or the same.
The packet management module 220 includes a two-way transfer module and at least one media management module of the Media Access Control type, also known by the acronym MAC, which implements the Ethernet protocol whose architecture is detailed below in the description.
By extension, the transfer module is not limited to a two-way transfer module but can be a multi-way type transfer module.
In receipt, the signals transiting over the first connector-module link 401 and the second connector-module link 402 are analyzed and transformed into digital data by the first physical link management module 231 and the second physical link management module 232 of the communicating device 200.
Thus, the signals transiting over the first connector-module link 401a and the second connector-module link 402a of the first communicating device 200a are analyzed and transformed into digital data by the first physical link management module 231a and the second physical link management module 232a of the first communicating device 200a.
Similarly, the signals transiting over the first connector-module link 401b and the second connector-module link 402b of the second communicating device 200b are analyzed and transformed into digital data by the first physical link management module 231b and the second physical link management module 232b of the second communicating device 200b.
The digital data are then transmitted to the packet management module 220 of the communicating device 200, namely the first packet management module 220a of the first communicating device 200a and the second packet management module 220b of the second communicating device 200b, which analyzes them in the form of Ethernet packets or frames.
The communicating device 200 also comprises a higher-level protocol layer 210, namely a first higher-level protocol layer 210a of the first communicating device 200a and a second higher-level protocol layer 210b of the second communicating device 200b.
The Ethernet packets or frames analyzed by the packet management module 220 are then transmitted to the higher-level protocol layer 210, particularly the first higher-level protocol layer 210a and the second higher-level protocol layer 210b.
In emission, the packet management module 220, particularly the first packet management module 220a of the first communicating device 200a and the second packet management module 220b of the second communicating device 200b, receives the data to be transmitted from the higher-level protocol layer 210, particularly the first higher-level protocol layer 210a and the second higher-level protocol layer 210b, typically from an IP protocol stack in the form of IP packets.
The packet management module 220 assembles the Ethernet packets or frames conveying the IP data and transmits them to the first physical link management module 231 and to the second physical link management module 232, namely the first physical link management module 231a and the second physical link management module 232a of the first communicating device 200a and the first physical link management module 231b and the second physical link management module 232b of the second communicating device 200b, for their emission in the form of signals on the first connector-module link 401 and the second connector-module link 402, particularly on the first connector-module link 401a and a second connector-module link 402a of the first communicating device 200a and the first connector-module link 401b and the second connector-module link 402b of the second communicating device 200b.
The packet management module 220, particularly the first packet management module 220a of the first communicating device 200a and the second packet management module 220b of the second communicating device 220b, also includes a configuration interface to allow the configuration of the packet management module 220 in:
The packet management module 220 can be made in different forms, in a unitary or distributed manner, by means of hardware and/or software components. Usable hardware components are the programmable logic circuits, also referred to by the acronym FPGA for “Field-Programmable Gate Array”, in the form of integrated circuits specific to an application or function, also referred to by the acronym ASIC for “Application Specific Integrated Circuit”, or of microprocessors.
Thus, the transfer module and the media management module of the packet management module 220 can be implemented by means of the same component or on different components linked by a local communication link.
Reference is now made to
For a better understanding, the method is described in the context of a transfer of data from the first communicating device 200a to the second communicating device 200b, the exchanges being two-way exchanges, of course the method can also be implemented simultaneously for the transfer of data from the second communicating device 200b to the first communicating device 200a.
The method implements, preferably successively, the following steps:
As part of a transfer of data from the second communicating device 200b to the first communicating device 200a, the method implements, preferably successively, the following steps:
In the embodiment presented in
Specifically, on the one hand, the first packet management module 220a of the first communicating device 200a includes at least a first transfer module 222a and at least a first media management module 221a, in particular of the MAC type, which implements the ethernet protocol. On the other hand, the second packet management module 220b of the second communicating device 200b includes at least a second transfer module 222b and at least a second media management module 221b, in particular of the MAC type, which implements the Ethernet protocol.
The media management module 221 includes means for two-way communication with the higher-level protocol layer 210 to emit/receive data packets.
Furthermore, the media management module 221 and the transfer module 222 are linked by a specific bus ensuring the two-way transmission of data frames.
The first transfer module 222a of the first communicating device 200a is linked by two buses, particularly separate and independent and by extension several buses, ensuring two-way transmission with the first physical link management module 231a and the second physical link management module 232a of the first communicating device 200a to emit/receive frames.
In relation to
The step of receiving source data EO includes the receipt, by the media management module 221 of the communicating device 200, of the source packet to be transmitted, emitted by the higher-level protocol layer 210.
In the step of generating intermediate frames E10, the media management module 221 of the communicating device 200 generates an exchanged data frame encapsulating the data packet and transmits the exchanged data frame to the transfer module 222.
As illustrated in
The data-field DATA has a maximum size equal to the maximum size of a packet, also referred to by the acronym MTU for “Maximum Transmission Unit” which, by default, is equal to 1,500 bytes. Alternatively, padding bits are added to reach a size of 46 bytes.
The transfer module 222 of the communicating device 200 then performs the generation of the first intermediate frame 510a and of the second intermediate frame 510b in which the N bits of the data field of the source packet are distributed. The first intermediate frame 510a and the second intermediate frame 510b are intended to be emitted on a separate physical link, namely the first connector-module link 401 and the second connector-module link 402.
The transfer module 222 of the communicating device 200 performs the distribution of the N bits of the data field of the source packet of the exchanged data frame 500 between the first intermediate frame 510a and the second intermediate frame 510b by a balanced distribution, in particular from a basic law or from another predefined law.
The N bits of the data field of the source packet of the exchanged data frame 500 can be distributed in the data-fields DATA of the first intermediate frame 510a and the second intermediate frame 510b by p-tuples of bits, with p comprised between 1 and n/2. Padding bits can also be added to reach 46 bytes.
The transfer module 222 also performs an encapsulation, that is to say in the present case a distribution, in the first intermediate frame 510a and the second intermediate frame 510b, of the address-field ADR, of the type-field TYPE and of the verification-field CRC.
The transfer module 222 can also encapsulate, or distribute, the preamble-field Pet the delimiter-field SOF of the exchanged data frame 500.
Alternatively, the transfer module 222 can also:
In such configurations, the preamble-field P can be said to be “reduced” because it is composed of a number of bits lower than the number of bits of the preamble-field P of the exchanged frame data 500. However, in these same configurations, the new delimiter-field SOF will not be “reduced”.
The integrity of the data on each of the first intermediate frame 510a and of the second intermediate frame 510b is ensured by the verification-field CRC which makes it possible, through a calculation, to validate the data transmitted in the exchanged data frame 500.
The verification-field CRC is positioned at the end of the exchanged data frame 500 and corresponds to all of the bits of the intermediate frame, respectively of the first intermediate frame 510a and of the second intermediate frame 510b.
Advantageously, the verification-field calculation CRC is based on a polynomial Cyclic Redundancy Check of degree 32, in particular meeting the CRC-32-IEEE standard. Thus, the calculation of the verification-field CRC for the first intermediate frame 510a and the second intermediate frame 510b may be based on the identical generator polynomials or the generator polynomials may be different for the first intermediate frame 510a and the second intermediate frame 510b.
In the first step of transmitting intermediate frames E20, the transfer module 222 of the communicating device 200 performs the transmission of the first intermediate frame 510a and of the second intermediate frame 510b, in particular via respectively the first physical link management module 231 and the second physical link management module 232 of the communicating device 200.
To this end, each of the first intermediate frame 510a and of the second intermediate frame 510b is emitted on a separate physical link of the communicating device 200, namely the first connector-module link 401 and the second connector-module link 402 of the communicating device 200.
In the second step of transmitting intermediate frames E30, the first intermediate frame 510a and the second intermediate frame 510b are transmitted to another communicating device 200, respectively the second communicating device 200b if the step of generating intermediate frames E10 is carried out by the first communicating device 200a, or the first communicating device 200a if the step of generating intermediate frames E10 is carried out by the second communicating device 200b, via the inter-device link 404.
Each of the first intermediate frame 510a and of the second intermediate frame 510b is emitted on a separate physical link.
The first intermediate frame 510a and the second intermediate frame 510b can be transmitted simultaneously or with a small time lag, comprised in a given time window.
In the step of receiving intermediate frames E40, the first intermediate frame 510a and the second intermediate frame 510b are received on the physical links of the other communicating device 200, respectively the second communicating device 200b if the step of generating intermediate frames E10 is carried out by the first communicating device 200a, or the first communicating device 200a if the step of generating intermediate frames E10 is carried out by the second communicating device 200b, via the inter-device link 404.
The first intermediate frame 510a and the second intermediate frame 510b can be received simultaneously or with a small time lag, comprised in a given time window.
In the third step of transmitting intermediate frames E50, the first intermediate frame 510a and the second intermediate frame 510b are transmitted to the transfer module 222 of the other communicating device 200, particularly to the second transfer module 222b of the second communicating device 200b.
In the step of reconstituting source data E60, the transfer module 222 of the communicating device 200, particularly the second transfer module 222b of the second communicating device 200b, performs the aggregation of the first intermediate frame 510a and of the second intermediate frame 510b received to reconstitute the source frame.
In the step of reconstituting source data E60, on receipt of a first intermediate frame 510a, the transfer module 222 triggers a time window of predefined maximum duration, constituting a receiving Delta T, in which the second intermediate frame 510b, that is to say the late frame, must be received.
If the second intermediate frame 510b is not received after the time window of predefined maximum duration has elapsed, the step of reconstituting source data E60 is not carried out and the source frame 500 is not reconstituted. Alternatively, the first received frame can also be the second intermediate frame 510b, the triggering of the receiving time window taking place on receipt of the second intermediate frame 510b.
The reconstitution or aggregation function returns to awaiting receipt of the group of the following first intermediate frame 510a and second intermediate frame 510b.
The time window of predefined maximum duration can be set on the detection of the delimiter-field SOF in the first intermediate frame 510a and in the second intermediate frame 510b.
To perform the aggregation or the reconstitution, the transfer module 222 of the communicating device 200 implements an aggregation law in correspondence with the distribution law used for the distribution of the bits of the source packet in the step of generating intermediate frames E10 to reconstitute the source frame 500.
The data of the source packet are reconstituted from the data of the first intermediate frame 510a and of the second intermediate frame 510b. The other fields of the source frame 500 are also reconstituted.
The first intermediate frame 510a and the second intermediate frame 510b are also validated by the dedicated verification-field CRC. In case of inconsistency, the reconstituted source frame 500 is not validated.
If the reconstituted source frame 500 is validated, it is then transmitted to the media management module 221 of the communicating device 200 which transmits the source packet to the higher-level protocol layer 210.
The description which has just been given is such that the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the first communicating device 200a. However, what has just been described can be mutually transposed in an analogous manner if the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the second communicating device 200b, particularly simultaneously or non-simultaneously.
In relation to
The step of receiving source data EO includes the receipt, by the media management module 221 of the communicating device 200, of the source packet to be transmitted, emitted by the higher-level protocol layer 210.
The media management module 221 generates the source frame 500 encapsulating the data packet and transmits the source frame 500 to the transfer module 222.
In the step of generating intermediate frames E10, the transfer module 222 of the communicating device 200 performs the generation of the first intermediate frame 510a and the second intermediate frame 510b in which the N-bits of the data-field are duplicated. Each of the first intermediate frame 510a and of the second intermediate frame 510b is intended to be emitted on a separate physical link, namely the first connector-module link 401 and the second connector-module link 402.
The transfer module 222 also performs the encapsulation, that is to say in the present case a duplication, in the first intermediate frame 510a and the second intermediate frame 510b, of the address-fields ADR and of the type-field TYPE and generates for each the first intermediate frame 510a and of the second intermediate frame 510b, a new sequence of bits for the preamble-field P. This preamble-field P is said to be “reduced” because it is composed of a number of bits lower than the number of bits of the preamble of the source frame 500.
Alternatively, the preamble-field P can be kept the same, this will be to the detriment of the size of the first intermediate frame 510a and of the second intermediate frame 510b which will be increased by the size of the redundancy sequence.
The transfer module 222 also generates a new delimiter-field SOF and a correcting code for the first intermediate frame 510a and the second intermediate frame 510b.
Preferably, the new delimiter-field SOF has a value identical to the source delimiter-field SOF.
Preferably, a redundancy sequence is added or associated with the correcting code.
The correcting code is based on the redundancy and is intended to correct the transmission errors of the first intermediate frame 510a and of the second intermediate frame 510b.
To this end, the correcting code makes it possible to detect and correct or only detect the transmission errors according to the choice of the redundancy sequence, according to the type of associated polynomial, the dimension, etc.
The redundancy sequence is associated with the code. Thus, the correcting code is located at the end of the frame and corresponds to all of the bits of the frame.
The calculation of the code, including in particular the redundancy sequence itself excluding the preamble-field P and the delimiter-field SOF, is for example based on a Reed-Solomon code for the detection and correction of erroneous bits or on a CRC type code for the detection of erroneous bits. The calculation of the verification-field CRC for the first intermediate frame 510a and the second intermediate frame 510b can be based on the formal polynomial. Particularly, the formal polynomial may be different for the first intermediate frame 510a and the second intermediate frame 510b.
In the first step of transmitting intermediate frames E20, the transfer module 222 performs the transmission of the first intermediate frame 510a and of the second intermediate frame 510b. To this end, each of the first intermediate frame 510a and of the second intermediate frame 510b is emitted on a physical link of the communicating device 200, namely the first connector-module link 401 and the second connector-module link 402 of the communicating device 200.
In the second step of transmitting intermediate frames E30, the first intermediate frame 510a and the second intermediate frame 510b are transmitted to the second communicating device 200b, if the step of generating intermediate frames E10 is carried out by the first communicating device 200a, or to the first communicating device 200a, if the step of generating intermediate frames E10 is carried out by the second communicating device 200b, via the inter-device link 404.
The first intermediate frame 510a and the second intermediate frame 510b can be transmitted simultaneously or with a small time lag, comprised in a given time window.
However, in the case of the integrity capability, a low time lag on emission, that is to say a time lag of X bits between the transmission of the intermediate frames can globally improve the integrity and availability. Indeed, the disturbance does not apply to the same position of a sequence of bits on each of the intermediate frames.
The intermediate frames can be received simultaneously or with a small time lag, comprised in a given time window.
In the step of receiving intermediate frames E40, the first intermediate frame 510a and the second intermediate frame 510b are received on the physical links of the second communicating device 200b.
The first intermediate frame 510a and the second intermediate frame 510b can be received simultaneously or with a small time lag, comprised in a given time window.
In the third step of transmitting intermediate frames E50, the transmitted first intermediate frame 510a and second intermediate frame 510b are transmitted to the transfer module 222 of the second communicating device 200.
The intermediate frames can be received simultaneously or with a small time lag, comprised in a given time window.
In the third step of transmitting intermediate frames E50, the transfer module 222 of the communicating device 200, particularly the second transfer module 222b of the second communicating device 200b, performs a verification of the integrity of the first intermediate frame 510a and of the second intermediate frame 510b received.
The third step of transmitting intermediate frames E50 could further comprise a correction of erroneous bits according to the type of code of a dedicated redundancy sequence.
At the third step of transmitting intermediate frames E50, on receipt of a first frame 510a, the transfer module 222 of the second communicating device 200, particularly the second transfer module 222b of the second communicating device 200b, triggers a time window of a predefined maximum duration, constituting a receiving Delta T, in which the second intermediate frame 510b, that is to say the late frame, must be received.
If the second intermediate frame 510b is not received after the time window of predefined maximum duration has elapsed, the third step of transmitting intermediate frames E50, then also consisting of a verification step, is not carried out and the source frame 500 is not reconstituted.
The integrity verification function could include the correction of erroneous bits. Consequently, it returns to awaiting receipt of the group of the following first intermediate frame 510a and second intermediate frame 510b.
The time window of predefined maximum duration can be set on the detection of the delimiter-field SOF in the first intermediate frame 510a and in the second intermediate frame 510b.
To perform the verification of the integrity, the transfer module 222 performs the checking, from the redundancy sequence and according to the selected correcting code, the detection and the correction of erroneous bits or the simple detection of erroneous bits, for the first intermediate frame 510a and for the second intermediate frame 510b.
In case of inconsistency, the intermediate frame is not validated.
If the first intermediate frame 510a and the second intermediate frame 510b are not validated, the source frame 500 is not restored.
If the first intermediate frame 510a or the second intermediate frame 510b is validated, the source frame 500 can be restored, from the first intermediate frame 510a validated as a function of the integrity criteria previously applied with restoration of a complete preamble-field P or, by predefined choice, from the first intermediate frame 510a if the first intermediate frame 510a and the second intermediate frame 510b are simultaneously validated.
Furthermore, in particular in the case of enhanced integrity, a comparison of the data, particularly bit by bit, of the first intermediate frame 510a and of the second intermediate frame 510b is carried out. In case of inconsistency, the integrity verification is not validated and the source frame 500 is not validated.
If the source frame 500 is validated, it is then transmitted to the media management module 221 of the communicating device 200, particularly to the second media management module 221b of the second communicating device 200b, which transmits the source packet to the higher-level protocol layer 210, namely the second higher-level protocol layer 210b.
The description which has just been made is such that the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the first communicating device 200a. However, what has just been described can be mutually transposed in an analogous manner if the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the second communicating device 200b, particularly simultaneously or non-simultaneously.
In the embodiment presented in
Specifically, the first transfer module 222a of the first packet management module 220a of the first communicating device 200a includes means for two-way communication with the first higher-level protocol layer 210a to emit/receive data packets. Furthermore, the second transfer module 222b of the second packet management module 220b of the second communicating device 200b includes means for two-way communication with the second higher-level protocol layer 210b to emit/receive data packets.
In addition, the packet management module 220 of the communicating device 200 also includes two media management modules 221, particularly two first media management modules 221a of the first communicating device 200a and two second media management modules 221b of the second communicating device 200b.
The two media management modules 221 include means for two-way communication with the first physical link management module 231 and the second physical link management module 232 to emit/receive frames.
The two media management modules 221 and the transfer module 222 are linked by a specific bus ensuring the two-way transmission of data frames.
Specifically, the first two media management modules 221a and the first transfer module 222a of the first communicating device 200a are linked by a specific bus ensuring the two-way transmission of data frames. Similarly, the two second media management modules 221b and the second transfer module 222b are linked by a specific bus ensuring the two-way transmission of data frames.
In relation to
The source data receiving step EO includes the receipt by the transfer module 222 of the communicating device 200 of a source packet to be transmitted emitted by the higher-level protocol layer 210.
In the step of generating intermediate frames E10, the transfer module 222 of the communicating device 200 performs the distribution of the N bits of the data field of the source packet between a first intermediate data packet, or first intermediate frame, and a second intermediate data packet, or second intermediate frame, by a balanced distribution, in particular from a basic law or from another predefined law.
The N bits of the data field of the source packet or source data can be distributed in the first intermediate data packet and the second intermediate data packet by n-tuples of bits.
In the first step of transmitting intermediate frames E20, the transfer module 222 of the communicating device 200 performs the transmission of the first intermediate data packet and the second intermediate data packet generated respectively to the two media management modules 221 of the communicating device 200.
The two media management modules 221 of the communicating device 200 then respectively generate a frame in the typical standardized format, responding in particular to the IEEE 802.3 standard, encapsulating the intermediate data packet received.
Consequently, the two media management modules 221 of the communicating device 200 transmit the two frames in the typical standardized format via respectively the first physical link management module 231 and the second physical link management module 232 of the communicating device 200.
Particularly, the first two media management modules 221a of the first communicating device 200a transmit the two frames in the typical standardized format via respectively the first physical link management module 231a and the second physical link management module 232a of the first communicating device 200a.
To this end, the two frames in the typical standardized format are emitted on a separate physical link of the communicating device 200, namely the first connector-module link 401a and the second connector-module link 402a of the first communicating device 200a.
In the second step of transmitting intermediate frames E30, the two frames in the typical standardized format are transmitted to another communicating device, respectively the second communicating device 200b if the step of generating intermediate frames E10 is carried out by the first communicating device 200a, or the first communicating device 200a if the step of generating intermediate frames E10 is carried out by the second communicating device 200b, via the inter-device link 404.
Each of the frames in the typical standardized format is emitted on a separate physical link.
The two frames in the typical standardized format can be transmitted simultaneously or with a small time lag, comprised in a given time window.
In the step of receiving intermediate frames E40, the two frames in the typical standardized format are received on the physical links of the other communicating device 200, respectively the second communicating device 200b if the step of generating intermediate frames E10 is carried out by the first communicating device 200a, or the first communicating device 200a if the step of generating intermediate frames E10 is carried out by the second communicating device 200b, via the inter-device link 404.
Particularly, the first physical link management module 231b of the second communicating device 200b receives one of the two frames in the typical standardized format via the first connector-module link 401b of the second communicating device 200b, and the second physical link management module 232b of the second communicating device 200b receives the other of the two frames in the typical standardized format via the second connector-module link 402b of the second communicating device 200b.
In the third step of transmitting intermediate frames E50, the two frames in the typical standardized format are transmitted to each media management module 221 of the other communicating device 200, particularly to the two second media management modules 221b of the second communicating device 200b.
Consequently, during the third step of transmitting intermediate frames E50, each media management module 221 of the other communicating device 200 respectively each transmits the intermediate packets extracted from the intermediate frames received to the transfer module 222 of the other communicating device 200, particularly the second transfer module 222b of the second communicating device 200b.
In the step of reconstituting source data E60, the transfer module 222 of the communicating device 200 performs the aggregation of the intermediate packets received to reconstitute the source frame.
In the step of reconstituting source data E60, on receipt of the first of the two frames in the typical standardized format, the transfer module 222, particularly the second transfer module 222b of the second communicating device 200b, triggers a time window of predefined maximum duration, constituting a receiving Delta T, in which the second of the two frames in the typical standardized format, that is to say of the late frame, must be received.
If the second of the two frames in the typical standardized format is not received after the time window of predefined maximum duration has elapsed, the step of reconstituting source data E60 is not carried out and the source frame 500 or the source data 500 is not reconstituted.
The aggregation function returns to awaiting receipt of the group of the next two frames in the typical standardized format.
The time window of predefined maximum duration can be set on the detection of the delimiter-field SOF in the first intermediate frame 510a and in the second intermediate frame 510b.
To perform the aggregation, the transfer module 222 of the communicating device 200, particularly the second transfer module 222b of the second communicating device 200b, implements an aggregation law in correspondence with the distribution law used for the distribution of the bits of the source packet in the step of generating intermediate frames E10 to reconstitute the source frame 500 or the source data 500.
The data of the source packet are reconstituted from the data of the two frames in the typical standardized format. If the source frame 500, or the source data 500, reconstituted is validated, the source packet is then transmitted to the higher-level protocol layer 210, namely the second higher-level protocol layer 210b.
The description which has just been made is such that the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the first communicating device 200a. However, what has just been described can be mutually transposed in an analogous manner if the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the second communicating device 200b, particularly simultaneously or non-simultaneously.
In relation to
The step of receiving source data EO includes the receipt by the transfer module 222 of the communicating device 200, particularly the first transfer module 222a of the first communicating device 200a, of a source packet to be transmitted, emitted by the upper protocol layers 210, particularly the first higher-level protocol layer 210a.
In the step of generating intermediate frames E10, the two-way transfer module 222 of the communicating device 200 performs the duplication of the N bits of the data field of the source packet between a first intermediate data packet or first intermediate frame, and a second intermediate data packet or second intermediate frame.
In the first step of transmitting intermediate frames E20, the transfer module 222 of the communicating device 200 performs the transmission of the respectively generated first intermediate data packet and second intermediate data packet to the two media management modules 221 of the communicating device 200.
The two media management modules 221 of the communicating device 200 then respectively generate a frame in the typical standardized format, responding in particular to the IEEE 802.3 standard, encapsulating the intermediate data packet received.
In the second step of transmitting intermediate frames E30, the two frames in the typical standardized format are transmitted to another communicating device, respectively the second communicating device 200b if the step of generating intermediate frames E10 is carried out by the first communicating device 200a, or the first communicating device 200a if the step of generating intermediate frames E10 is carried out by the second communicating device 200b, via the inter-device link 404.
Particularly, in the case of the integrity capability, a low time lag on emission, that is to say a time lag of X bits between the transmission of the intermediate frames can globally improve the integrity and the availability. Indeed, the disturbance does not apply to the same position of a sequence of bits on each of the intermediate frames.
Each of the frames in the typical standardized format is emitted on a separate physical link.
The two frames in the typical standardized format can be transmitted simultaneously or with a small time lag, comprised in a given time window.
In the step of receiving intermediate frames E40, the two frames in the typical standardized format are received on the physical links of the second communicating device 200, respectively the second communicating device 200b if the step of generating intermediate frames E10 is carried out by the first communicating device 200a, or the first communicating device 200a if the step of generating intermediate frames E10 is carried out by the second communicating device 200b, via the inter-device link 404.
In the third step of transmitting intermediate frames E50, each media management module 221 of the communicating device 200 respectively transmits the intermediate packets extracted from the received intermediate frames to the transfer module 222 of the other communicating device 200, particularly the second module transfer 222b of the second communicating device 200b.
In the third step of transmitting intermediate frames E50, the transfer module 222 of the other communicating device 200 performs the verification of the integrity of the two intermediate packets received to reconstitute the source packet.
The third step of transmitting intermediate frames E50 may further comprise a correction of erroneous bits according to the type of code of a dedicated redundancy sequence.
In the third step of transmitting intermediate frames E50, in the case of enhanced integrity, on receipt of the first of the two intermediate packets, the transfer module 222 of the second communicating device 200 triggers a time window of predefined maximum duration, constituting a receiving delta T, in which the second of the two intermediate packets, that is to say the late frame, must be received.
If the second of the two intermediate packets is not received after the time window of predefined maximum duration has elapsed, the third step of transmitting intermediate frames E50 is not carried out and the source packet is not reconstituted.
The integrity verification function could include the correction of erroneous bits. As a result, it returns to awaiting receipt of the group of the following two intermediate packets.
Furthermore, in particular in the case of enhanced integrity, a comparison of the data of each intermediate packet is carried out, in the event of inconsistency, the integrity verification is not validated and the source packet is not reconstituted.
If the verification is validated, the data of the source packet are reconstituted from the data of the intermediate packets. The source packet is then transmitted to the higher protocol layers 210.
Preferably, at all the transmission steps of the methods described above, the frames can be received simultaneously or with a small time lag, comprised in a given time window.
The description which has just been made is such that the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the first communicating device 200a. However, what has just been described can be mutually transposed in an analogous way if the step of receiving source data EO and the step of generating intermediate frames E10 are carried out by the second communicating device 200b.
The disclosure has been described by considering the two-way data communication system 100 according to the specificities mentioned above. However, the disclosure is also likely to apply to part of the two-way data communication system 100.
Obviously, the disclosure is not limited to the embodiments described above and provided solely by way of example. It encompasses various modifications, alternative forms and other variants that those skilled in the art may envisage in the context of the disclosure and in particular all combinations of the different operating modes described above, which may be taken separately or in combination.
The present application is a National Stage entry of International Application No. PCT/FR2022/050276, filed on Feb. 15, 2022, which is based on and claims priority to French Application No. 2101467, filed on Feb. 16, 2021, the contents of each of which being herein incorporated by reference in their entireties.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/FR2022/050276 | 2/15/2022 | WO |
