METHOD AND SYSTEM FOR TRANSMITTING A RESPONSE MESSAGE

Abstract

A method transmits a response message in response to an incoming message. A header portion of the incoming message is identical to a header portion of the response message. A payload of the incoming message is different from a payload of the response message. The method splits an incoming physical signal representing the incoming message into a first and a second copy. The first copy is provided to a transmitter system. Further, the method generates a signal and, based on determining that a message is received from at least part of the second copy, provides the generated signal to the transmitter system so that the generated signal is transmitted after at least part of the first copy's header part has been transmitted. The transmitted at least part of the first copy's header part and the transmitted generated signal together form a transmitted response signal representing the response message.

Claims

1. A method for transmitting a response message in response to an incoming message, wherein the incoming message comprises a header portion and a payload, wherein the response message also comprises a header portion and a payload, wherein the header portion of the incoming message is identical to the header portion of the response message, wherein the payload of the incoming message is different from the payload of the response message, the method comprising receiving an incoming physical signal representing the incoming message, this step comprising receiving a header part of the incoming physical signal, the header part representing the header portion of the incoming message, and thereafter receiving a payload part of the incoming physical signal, the payload part representing the payload of the incoming message, and splitting the incoming physical signal into a first copy of the incoming physical signal and a second copy of the incoming physical signal, and providing the first copy of the incoming physical signal to a transmitter system so that at least part of a first copy's header part is transmitted, and interpreting at least part of the second copy of the incoming physical signal to determine that a message is received, and generating a generated signal, and based on determining that a message is received, providing the generated signal to the transmitter system so that the generated signal is transmitted after the at least part of the first copy's header part has been transmitted, wherein the transmitted at least part of the first copy's header part and the transmitted generated signal together form a transmitted response signal representing the response message.

2. The method according to claim 1, wherein the incoming physical signal is not interpreted before splitting the incoming physical signal into the first copy and the second copy, and wherein splitting the incoming physical signal does not involve interpreting the incoming physical signal, and wherein the first copy of the incoming physical signal is not interpreted before and not interpreted during transmitting the at least part of the first copy's header part.

3. The method according to claim 1, wherein the generated signal comprises a predefined part that has already been defined before determining that a message is received, said predefined part of the generated signal representing at least part of the payload of the response message.

4. The method according to claim 1, further comprising interpreting at least part of the second copy of the incoming physical signal to determine at least part of the incoming message, and determining, based on the determined at least part of the incoming message, at least part of the payload of the response message.

5. The method according to claim 1, wherein each of the incoming physical signals, the first and second copy of the incoming physical signal, the generated signal and the transmitted response signal is a physical signal.

6. The method according to claim 1, further comprising synchronizing the generated signal to the first copy of the incoming physical signal.

7. The method according to claim 1, further comprising based on determining that a message is received, switching from (i) providing the first copy of the incoming physical signal to the transmitter system to (ii) providing the generated signal to the transmitter system.

8. The method according to claim 7, wherein the switching is performed such that the transmitted response signal is correctly interpreted by a receiver.

9. The method according to claim 1, wherein the generated signal is synchronized with the incoming physical signal such that the transmitted response signal is correctly interpreted by a receiver.

10. The method according to claim 1, wherein the incoming physical signal is an electrical signal or a light signal.

11. A system for transmitting a response message in response to an incoming message, wherein the incoming message comprises a header portion and a payload, wherein the response message also comprises a header portion and a payload, wherein the header portion of the incoming message is identical to the header portion of the response message, the system comprising an input for receiving an incoming physical signal representing the incoming message, the incoming physical signal comprising a header part, the header part representing the header portion of the incoming message, and a payload part, the payload part representing the payload of the incoming message, and a transmitter system for transmitting a transmitted response signal representing the response message, wherein the system is configured to split the incoming physical signal into a first copy of the incoming physical signal and a second copy of the incoming physical signal, and provide the first copy of the incoming physical signal to the transmitter system so that at least part of a first copy's header part is transmitted, the system further comprising a data processing system configured to interpret at least part of the second copy of the incoming physical signal to determine that a message is received, and to generate a generated signal, and to based on determining that a message is received, cause the system to provide the generated signal to the transmitter system so that the generated signal is transmitted after the at least part of the first copy's header part has been transmitted, wherein the transmitted at least part of the first copy's header part and the transmitted generated signal together form a transmitted response signal representing the response message.

12. The system according to claim 11, wherein the system is configured to not interpret the incoming physical signal before the incoming physical signal is split into the first copy and the second copy, and to split the incoming physical signal without interpreting the incoming physical signal, and to not interpret the first copy of the incoming physical signal before and not interpret the first copy during transmission of the at least part of the first copy's header part.

13. The system according to claim 11, wherein the system further comprises a switch for controlling whether or not the first copy of the incoming physical signal is provided to the transmitter system and for controlling whether or not the generated signal is provided to the transmitter system, wherein the data processing system is configured to cause the system to provide the generated signal to the transmitter system by sending a control signal to the switch.

14. The system according to claim 11, wherein the data processing system comprises a storage medium having stored thereonbefore the data processing system determines that a message is receivedprestored data representing at least part of the payload of the response message, wherein the data processing system is configured to generate the generated signal based on the prestored data.

15. The method according to claim 1, further comprising interpreting at least part of the second copy of the incoming physical signal to determine at least part of the header portion and/or at least part of the payload of the incoming message,

16. The method according to claim 15, further comprising determining based on the determined at least part of the header portion, at least part of the payload of the response message.

17. The method according to claim 15, further comprising determining, based on the at least part of the payload of the incoming message, at least part of the payload of the response message.

18. The method according to claim 1, wherein each of the incoming physical signals, the first and second copy of the incoming physical signal, the generated signal and the transmitted response signal is a physical signal representing a bit stream.

19. The method according to claim 9, wherein the generated signal is bit aligned with the incoming physical signal.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Aspects of the invention will be explained in greater detail by reference to exemplary embodiments shown in the drawings, in which:

[0071] FIGS. 1-5 illustrate a system and method according to an embodiment;

[0072] FIG. 6 clarifies a distinction between processing of a physical signal and of a logical message;

[0073] FIG. 7 illustrates a data processing system according to an embodiment.

DETAILED DESCRIPTION OF THE DRAWINGS

[0074] In the figures, identical reference numbers indicate identical or similar elements.

[0075] FIG. 1-5 schematically show a system for transmitting a response message in response to an incoming message according to an embodiment. FIGS. 1-5 also schematically illustrate a method for transmitting a response message in response to an incoming message according to an embodiment in that FIGS. 1-5 illustrate different states of the system 1 while the method according to an embodiment is performed.

[0076] The system 1 in FIG. 1-5 comprises an input 8 for receiving an incoming physical signal. The input 8 may be an input port, for example. However, the input may also simply be the place where the incoming physical signal enters the system 1. This signal may be an electrical signal or an electromagnetic signal, such as a light signal. An electrical signal may use current and/or voltage variations in order to convey information. An electromagnetic signal may use variations in radiant power of electromagnetic radiation, such as variation in light intensity, in order to convey information. The incoming physical signal may be provided to the system via electrical conductors in the case of electrical signals and via optical conductors, such as optical fiber cables, in the case of electromagnetic signals. The incoming physical signal may be a bit stream. Such bit stream may represent an ethernet packet.

[0077] The incoming physical signal represents the incoming message 2. This may be understood as that the incoming signal conveys information based on which the incoming message can be reconstructed. The incoming message 2 comprises a header portion 4 and a payload 6. In FIG. 1, the header portion comprises, for illustrative purposes, three bits A, B and C, and the payload 6 comprises six bits D, E, F, G, H, I. Thus, it should be appreciated that the incoming physical signal comprises a header part representing the header portion 4 and a payload part representing the payload 6. The header part of the incoming physical signal is received before the payload part.

[0078] The system 1 further comprises a splitter 9 for splitting the incoming physical signal into a first copy and a second copy, a transmitter system 12 for transmitting transmitted response signal representing the response message, a switch 10, a data processing system 100. The transmitter system 12 may be an output port of the system 1. However, the transmitter system may also simply be embodied for example as optical wires and/or electrical wires that lead the convey the response signal out of the system 1.

[0079] In the depicted system, the data processing system 100 is shown to comprise a deserialization module 14, which is configured to interpret at least part of the second copy of the incoming physical signal, in particular to deserialize the second copy of the incoming physical signal. The deserialization module 14 is preferably also configured to convey information to the logic 15 in a form which the logic 15 can process. The deserialization module 14 may for example be configured to digitize the second copy of the incoming signal, and thus to determine a digital signal based on the second copy of the incoming physical signal and then to convey this digital signal to the logic 15 in a form which the logic 15 can process.

[0080] In the depicted system, the data processing system 100 is shown to comprise a serialization module 17 which is configured to serialize a part of the response message as determined by the data processing system 100 in order to generate the signal, also referred to herein as the generated signal.

[0081] FIG. 1 further shows that the data processing system has stored data 16 which, as will be explained later, will turn out to be data 16 representing at least part of the response message's payload. It should be appreciated that this pre-stored data is optional. There may be no pre-stored data. The pre stored data 16 may be used to generate part of the response signal. Data 16 may be stored on non-transitory computer readable storage media (not shown) of data processing system 100.

[0082] FIG. 2 illustrates that the system 1 is configured to split the incoming physical signal into a first copy 18 of the incoming physical signal and a second copy 20 of the incoming physical signal. Any suitable element that can split the incoming physical signal may be used, given a certain type of incoming physical signal. In case the incoming physical signal is an electrical signal then the splitter 9 may comprise a buffer, for example, to split the incoming electrical signal into a first copy and second copy. In case of optical signals, such splitting of the signal may be performed by using optical splitters known in the art. The first and second copy of the incoming physical signal may still represent bit streams once they are interpreted. Also, it should be appreciated that the splitting does not involve interpreting the incoming physical signal and thus does not involve any deserialization.

[0083] FIG. 3 illustrates that the first copy 18 is provided to the transmitter system 12 so that at least part of the first copy's header part is being transmitted. In the depicted example, the entire header part, representing bits A, B, C is provided to the transmitter system 12 and thus transmitted. In the depicted example, no interpretation of the first copy of the incoming physical signal is performed, thus also no deserialization is performed on the first copy of the incoming physical signal. The incoming physical signal is thus directly fed back to the transmitter system 12 so that it is transmitted. In the depicted example, the first copy 18 is provided to the transmitter system 12 via switch 10.

[0084] FIG. 3 further shows that the second copy 20 of the incoming physical signal is provided to data processing system 100, in particular to a deserializer module 14 that will interpret, in particular deserialize, the incoming physical signal. After at least part of the second copy 20 has been interpreted, it is provided to logic 15, which is configured to determine that a message is received. The logic 15 is for example configured to recognize a bit pattern as a header portion of an incoming message. It should be appreciated that for the logic 15 to determine that a message is received, it is not necessary that the entire second copy of the incoming physical signal is interpreted.

[0085] FIG. 4 illustrates that the module 14 has deserialized the second copy of the incoming physical signal 20. The data processing system 100 can determine, based on the interpretation of the second copy of the incoming signal, that a message is received.

[0086] Based on determining that a message is arriving, the data processing system 100 may start to generate a signal. In any case, based on determining that a message is received, the data processing system 100 may cause a switch from (i) providing the first copy of the incoming physical signal to the transmitter system to (ii) providing the generated signal to the transmitter system 12. The data processing system 100 is configured to control the switch 10 as indicated by the arrow from data processing system 100 to the switch 10.

[0087] The generated signal in the depicted example represents the payload 28 of the response message 30 (also see FIG. 5). In this example, the generated signal comprises a predefined part that has already been defined before determining that a message is received, namely a part generated based on prestored data 16. This part represents part of the payload 28 of the response message 30. In the depicted example, this part of the payload which is predefined consists of bits J, K, L. It should be appreciated, however, that the pre-stored data 16 and the predefined part are optional.

[0088] In FIG. 4, the data processing system 100, in particular the logic 15, determines, based on the interpreted second copy of the incoming physical signal, a part 26 of the payload 28 of the response message 30. In the depicted example, this part of the payload that is determined by the data processing system 100 consists of bits M, N, O. In this example, part 28 is determined based on an at least partially determined header and/or on an at least partially determined payload of the incoming message. However, it should be appreciated that the system can also determine at least part of the payload, or the entire payload, of the response message without knowing what bits are in the header or payload of the incoming message. In an example, if the data processing system is unable to determine the bits of the header and/or payload, e.g. due to noise, it will determine a default payload of the response message, for example, which indicates that a message was not well-received.

[0089] The data processing system 100 may be understood to generate the signal by first determining the payload portion 28 (FIG. 5) of the response message and then generating the signal representing this determined payload portion 28. In particular, the generated signal may be generated by a serialization module 17 as shown. It should be appreciated that the data processing system may generate multiple signals, optionally based on the contents of the incoming message, after which the data processing system selects one of these multiple generated signals in order to provide the selected signal to the transmitter system. In such case, the data processing system may comprise multiple parallel signal generators.

[0090] The switch 10 is controlled such that right after the header part of the response signal representing bits A, B, C has been transmitted, the generated signal representing bits J, K, L, M, N, O are transmitted. To this end, the system may be configured to synchronize the generated signal to the first copy of the incoming physical signal. These signals are aligned in such a way that to the receiver it is interpretable. It should be appreciated that, for clarity, FIG. 4 depicts bits L and M separately from each other, however, they are transmitted back-to-back as shown in FIG. 5 such that in the response message, bit M follows bit L in manner compliant with the applicable transmission protocol

[0091] In order to get the timing correct of the generated signal as well as the timing of the switch, the data processing system 100 may receive a copy of the transmitted response signal from the transmitter system 12. (This is not shown in FIGS. 1-5.) The data processing system 100 can then determine whether the transmitted response signal is correct, for example whether it complies with message protocols as desired, for example with the ethernet protocol. If this is not the case, then the timing of the switch and/or the timing of the generated signal may have to be adapted.

[0092] Getting the timing right may be performed using test signals as incoming physical signals to which the system 1 should respond with a test response message. For example, if it turns out, upon analysis of the transmitted test response message, that the switch switches over from the first copy of the incoming physical signal to the generated signal too fast so that bits are missing in the test response message, the data processing system may be programmed to cause the switch to switch at a later time.

[0093] In an embodiment, a calibration may be performed for determining a correct timing for the generated signal and the switch. In such calibration, a test incoming signal, representing a test message may be input into the system. Then, a copy of the incoming signal (not the first copy or second copy described herein but a third copy) may be provided to a detector, whereas the second copy of the incoming signal is provided to a data processing system for interpreting the signal. The data processing system then detects that a message is received, determines a payload for a test response message and generates a test signal and provides this generated test signal to the detector as well. The detector can then compare the test incoming physical signal and the generated test signal in order to synchronize, e.g. bit align, these signals. The data processing system then may adjust its time delay to synchronize the signals. This time delay would then also be used by the data processing system in operation.

[0094] After performing such calibration, the data processing system knows upon detecting that an incoming message is received, when it needs to cause a switch from the first copy of the incoming physical signal to the generated signal. The data processing system may then also know which bit should be provided first by means of the generated response signal. Thus, after such calibration, the data processing system may have stored information indicating, at which particular time after detecting that an incoming message is received, the data processing system has to start generating the signal and when to cause a switch from the first copy to the generated signal, and preferably also information indicating that the first bit in the response signal that is represented by the generated signal, is the n.sup.th bit of the response message, n being an integer number.

[0095] FIG. 5 illustrates that the data processing system 100, based on determining that a message is received, has provided the response signal (bits J, K, L M, N, O) to the transmitter system 12 in such manner that the response signal is transmitted after the at least part of the first copy's header part has been transmitted, and such that the transmitted at least part of the first copy's header part (bytes A, B, C) and the transmitted generated signal together form a transmitted response signal representing the response message 30. The transmitted response signal may also represent a bit stream.

[0096] As is clear from a comparison of FIGS. 1 and 5, the response message 30 comprises a header portion 4 and a payload 28, and the header portion 4 of the incoming message 2 is identical to the header portion 4 of the response message 30. In this example, both header portions consist of bits A, B, C. In contrast, the payload of the response message 30 differs from the payload 6 of the incoming message 6.

[0097] It should be appreciated, however, that the system 1 is also able to send back a response message that is identical to an incoming message. When this happens, the switch 10 simply does not switch. In an example, the data processing system 100 may interpret at least part of a second copy of some incoming physical signal to determine at least part of an incoming message, e.g. at least part of a header and/or a payload, and may refrain from causing the switch 10 to switch based on the determined at least part of the incoming message.

[0098] FIG. 6 clarifies a distinction between processing of a physical signal and of a logical message. In FIG. 6, the physical signal is shown to arrive at the signal splitter 9, which splits the physical signal into a first copy 18 and a second copy 20. This split may be understood to occur in the physical layer, which is conceptually shown as the area below line 40. No interpretation of the physical signal is required for splitting the signal.

[0099] FIG. 6 illustrates that the second copy 20 of the physical signal is interpreted in the sense that it is decoded. This allows to determine the incoming message, process it, and allows to determine contents of a response message. These steps may be understood to be performed on a logical level which is conceptually indicated by the area above line 40.

[0100] In the depicted embodiment, after at least part of the response message has been determined, a physical signal is generated again which can be provided to the switch 10. The switch 10 may be controlled by control signals determined during or after the processing of the response message, as shown.

[0101] The switch 10 may switch, as described herein, between providing the first copy and providing the second copy to a transmission system. The switching itself, as shown, may be understood to occur again in the physical layer, thus without requiring interpretation of the physical signals.

[0102] It should be noted that in the embodiment of FIG. 6, the first copy 18 of the physical signal remains in the physical level and is thus not interpreted before it is provided to the transmission system.

[0103] FIG. 7 depicts a block diagram illustrating a data processing system according to an embodiment.

[0104] As shown in FIG. 7, the data processing system 100 may include at least one processor 102 coupled to memory elements 104 through a system bus 106. As such, the data processing system may store program code within memory elements 104. Further, the processor 102 may execute the program code accessed from the memory elements 104 via a system bus 106. In one aspect, the data processing system may be implemented as a computer that is suitable for storing and/or executing program code. It should be appreciated, however, that the data processing system 100 may be implemented in the form of any system including a processor and a memory that is capable of performing the functions described within this specification.

[0105] The memory elements 104 may include one or more physical memory devices such as, for example, local memory 108 and one or more bulk storage devices 110. The local memory may refer to random access memory or other non-persistent memory device(s) generally used during actual execution of the program code. A bulk storage device may be implemented as a hard drive or other persistent data storage device. The processing system 100 may also include one or more cache memories (not shown) that provide temporary storage of at least some program code in order to reduce the number of times program code must be retrieved from the bulk storage device 110 during execution.

[0106] Input/output (I/O) devices depicted as an input device 112 and an output device 114 optionally can be coupled to the data processing system. Examples of input devices may include, but are not limited to, a keyboard, a pointing device such as a mouse, a touch-sensitive display, an input 8 receiving the incoming physical signal, or the like. Examples of output devices may include, but are not limited to, a monitor or a display, speakers, the switch 10 described herein, the transmitter system 12 described herein, or the like. Input and/or output devices may be coupled to the data processing system either directly or through intervening I/O controllers.

[0107] In an embodiment, the input and the output devices may be implemented as a combined input/output device (illustrated in FIG. 7 with a dashed line surrounding the input device 112 and the output device 114). An example of such a combined device is a touch sensitive display, also sometimes referred to as a touch screen display or simply touch screen. In such an embodiment, input to the device may be provided by a movement of a physical object, such as e.g. a stylus or a finger of a user, on or near the touch screen display.

[0108] A network adapter 116 may also be coupled to the data processing system to enable it to become coupled to other systems, computer systems, remote network devices, and/or remote storage devices through intervening private or public networks. The network adapter may comprise a data receiver for receiving data that is transmitted by said systems, devices and/or networks to the data processing system 100, and a data transmitter for transmitting data from the data processing system 100 to said systems, devices and/or networks. Modems, cable modems, and Ethernet cards are examples of different types of network adapter that may be used with the data processing system 100.

[0109] As pictured in FIG. 7, the memory elements 104 may store an application 118. In various embodiments, the application 118 may be stored in the local memory 108, the one or more bulk storage devices 110, or apart from the local memory and the bulk storage devices. It should be appreciated that the data processing system 100 may further execute an operating system (not shown in FIG. 7) that can facilitate execution of the application 118. The application 118, being implemented in the form of executable program code, can be executed by the data processing system 100, e.g., by the processor 102. Responsive to executing the application, the data processing system 100 may be configured to perform one or more operations or method steps described herein.

[0110] Various embodiments of the invention may be implemented as a program product for use with a computer system, where the program(s) of the program product define functions of the embodiments (including the methods described herein). In one embodiment, the program(s) can be contained on a variety of non-transitory computer-readable storage media, where, as used herein, the expression non-transitory computer readable storage media comprises all computer-readable media, with the sole exception being a transitory, propagating signal. In another embodiment, the program(s) can be contained on a variety of transitory computer-readable storage media. Illustrative computer-readable storage media include, but are not limited to: (i) non-writable storage media (e.g., read-only memory devices within a computer such as CD-ROM disks readable by a CD-ROM drive, ROM chips or any type of solid-state non-volatile semiconductor memory) on which information is permanently stored; and (ii) writable storage media (e.g., flash memory, floppy disks within a diskette drive or hard-disk drive or any type of solid-state random-access semiconductor memory) on which alterable information is stored. The computer program may be run on the processor 102 described herein.

[0111] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms a, an, and the are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms comprises and/or comprising, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

[0112] The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of embodiments of the present invention has been presented for purposes of illustration, but is not intended to be exhaustive or limited to the implementations in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the present invention. The embodiments were chosen and described in order to best explain the principles and some practical applications of the present invention, and to enable others of ordinary skill in the art to understand the present invention for various embodiments with various modifications as are suited to the particular use contemplated.