CN114204964B - Power line network flow channel establishing method, device and system - Google Patents
Power line network flow channel establishing method, device and system Download PDFInfo
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- CN114204964B CN114204964B CN202010982625.8A CN202010982625A CN114204964B CN 114204964 B CN114204964 B CN 114204964B CN 202010982625 A CN202010982625 A CN 202010982625A CN 114204964 B CN114204964 B CN 114204964B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/544—Setting up communications; Call and signalling arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
Abstract
The embodiment of the application discloses a method, a device and a system for establishing a power line network flow channel, wherein the method comprises the following steps: a source node requests a domain main node to meet a time slot resource required by the transmission quality of a service stream according to initial channel transmission parameters of each channel estimation window, modifies the transmission parameters of the corresponding channel estimation windows if necessary, and establishes a fixed transmission channel by using the source node and a destination node to transmit the service stream; by utilizing the embodiment of the invention, the robustness of data transmission is ensured through the fixed transmission channel, and even if the network environment changes suddenly, the time slot for transmitting the service stream and the corresponding transmission parameters thereof can not be changed, so that the transmission quality of the service stream can be ensured.
Description
Technical Field
The present application relates to the field of power line communication, and in particular, to a method, an apparatus, and a system for establishing a power line network flow channel.
Background
Power Line Communication (PLC) is a carrier communication method for transmitting data through a power line. The power line network is very common all over the world, most families have power grid coverage, and the power line can be used for building the network by using the PLC, so that rewiring is not needed, and the wiring cost is reduced.
Various electrical devices are connected to the power line, and these devices generate various power line noises, including white noise, narrow-band noise, and impulse noise. The noise may have a great influence on data transmission on the power line, especially on some delay-sensitive services (such as games, live video, etc.), data interruption or jamming caused by error code may affect user experience.
Disclosure of Invention
The embodiment of the application provides a method, a device and a system for establishing a power line network flow channel.
In a first aspect, an embodiment of the present application provides a method for establishing a power line network flow channel, where a source node requests a domain master node to meet a time slot resource required by a service stream transmission quality according to an initial channel transmission parameter of each channel estimation window, and then establishes a fixed transmission channel using a time slot and a destination node to transmit the service stream.
The method comprises the following specific steps: a source node sends a resource request message to a domain master node; the resource request message at least comprises two pieces of indication information which respectively indicate the length of the requested time slot and a channel estimation window set, and the resource request message is used for requesting the domain master node to allocate the time slot with the length in the time slot range corresponding to the channel estimation window set;
the source node receives an authorization message of obtaining a time slot T by the domain main node; then the source node sends a flow channel establishment request message to a destination node, wherein the flow channel establishment request message comprises the indication information of the allocated time slot T, a channel transmission parameter and an identifier of a service flow S; wherein the channel transmission parameter is an initial channel transmission parameter X corresponding to a channel estimation window covered by the time slot T, or a channel transmission parameter X' recalculated based on the initial channel transmission parameter;
and after receiving the confirmation message which is sent by the destination node and can be established by the indication channel, the source node occupies the time slot T and transmits the service stream S by using the channel transmission parameter.
Optionally, in some possible embodiments, before the source node sends the flow channel establishment request message to the destination node, the method further includes: and the source node judges whether the initial channel transmission parameter corresponding to the time slot T can meet the transmission quality requirement of the service stream S, and if not, the source node recalculates the initial channel transmission parameter according to the transmission quality requirement of the service stream S to obtain the channel transmission parameter X'.
Optionally, in some possible embodiments, when the channel transmission parameter is a channel transmission parameter recalculated based on the initial channel transmission parameter, after the source node receives the acknowledgement message, the method further includes: and the source node configures the channel by using the recalculated channel transmission parameters.
Optionally, in some possible embodiments, the quality requirement of the service flow S includes one or more of the indexes of a minimum delay requirement, a maximum error rate requirement, a minimum rate requirement, and a minimum bandwidth requirement.
Optionally, in some possible embodiments, the set of channel estimation windows is at least one channel estimation window that satisfies a transmission quality requirement of the traffic stream S.
Optionally, in some possible embodiments, the channel transmission parameters corresponding to the timeslot T include: one or more of the parameters of the size of the transmission data block of the channel, the forward error correction FEC code rate, the bit loading table, the KP value of the robust communication mode and the window, and the like.
Optionally, in some possible embodiments, the sending, by the source node, the flow path establishment request message to the destination node includes: the source node sends a flow channel establishment request message to a destination node through a relay node; the source node receiving the acknowledgement message sent by the destination node comprises the source node receiving the acknowledgement message sent by the destination node through a relay node.
Optionally, in some possible embodiments, the source node sends a notification message to the domain master node, so as to notify the domain master node that the source node occupies the time slot T.
In a second aspect, the present invention provides a power line communication apparatus, which includes a transceiver, a processor, and a memory, where the transceiver, the processor, and the memory are coupled to each other, and the processor is configured to execute computer instructions, and cooperate with the transceiver and the memory, so that the power line communication apparatus is enabled to perform the steps performed by the source node in the above method embodiments.
In a third aspect, an embodiment of the present application provides a power line communication system, which includes the source node, the destination node, and the domain master node.
In a fourth aspect, an embodiment of the present application provides a chip or a chip system, where the chip or the chip system includes at least one processor and a communication interface, where the communication interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform a method according to any one of the foregoing first aspect or first implementation manners.
By utilizing the embodiment of the invention, a fixed time slot is allocated to a service flow and the corresponding transmission parameters are matched, so that the time slot for transmitting the service flow and the corresponding transmission parameters thereof can not be changed even if the network environment is changed, the transmission quality of the service flow can be ensured, and good experience is brought to users.
Drawings
FIG. 1 is a schematic diagram of a PLC system;
fig. 2A is a schematic structural diagram of a power line communication device;
FIG. 2B is a schematic diagram of a PLC communication module;
fig. 3 is a method for establishing a power line network flow channel according to an embodiment of the present invention;
fig. 4 is another method for establishing a power line network flow channel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another power line communication apparatus according to an embodiment of the present disclosure;
Detailed Description
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," comprising, "and" having, "and any variations thereof, do not denote an" exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
An exemplary PLC communication system may have the architecture shown in fig. 1. As shown in fig. 1, the power line communication system may include a power line, a gateway device, a plurality of power line communication devices, and a terminal or other network-using device. The power line is used for transmitting power signals, and the voltage signals can be used for driving electric appliances. The gateway device is connected with the Internet and used for providing access to the Internet. The power line communication device may include a gateway-side power line communication device (e.g., a first power line communication device shown in fig. 1) to which the gateway-side power line communication device is connected. The power line communication device may further include a terminal-side power line communication device (e.g., a second power line communication device shown in fig. 1) for providing a network signal to a network-using device such as a terminal.
The first power line communication device may receive data from the internet from the gateway device when transmitting the data from the internet to the terminal. The first power line communication device may also modulate data from the gateway onto the PLC signal and couple to the power line so that the data may be forwarded using the power line. The second power line communication device may be configured to demodulate a PLC signal transmitted by the power line to obtain data, and forward the data obtained after demodulation to the terminal in a wireless manner or the like, so that the terminal or another device receives the data from the internet side. Similarly, the system shown in fig. 1 may also implement data transmission from the terminal to the internet side.
A power line communication apparatus that transmits or receives a data signal through a power line generally includes a PLC module, a coupler, a processor, a memory, and the like. As shown in fig. 2A. The PLC communication module generally includes a PLC modem, a digital front end device DFE, an analog front end device AFE, and an analog-to-digital converter DAC/ADC, and some of them include a signal amplifier, etc., as shown in fig. 2B. The coupler has two main functions: the method has the advantages that strong electricity is isolated, power frequency voltage and power frequency current on a power line are prevented from entering carrier equipment, and personal safety and equipment safety are guaranteed; and secondly, signal coupling is realized, a transmitting end loads a high-frequency signal carrying information on the power frequency current, and a receiving end separates the high-frequency signal from the power frequency current. The above power line communication device may be a modem (modem) or other type of power line communication modem, and the present application is not limited thereto.
Generally, each power line communication device in a power line network area is peer-to-peer in terms of network distribution, and may be referred to as a node. There is one domain master node (DM) among all nodes in one area, and non-DM nodes may be referred to as normal nodes. A domain master node allocates a transmission Time Slot (TS) to each power line communication device in the domain through a Medium Access Plan (MAP) frame; thus, in each MAC cycle, all nodes (including the domain master and the normal nodes) receive and transmit data in their own time slots. It should be noted that the domain master node and the common node are divided according to the processing function of each node in actual operation, and they may be the same or different in hardware or software structure. In general, the role of a node does not change, but changes at different times, for example, a node that assumes the role of a domain master in one time period acts as a normal node in another time period, and another normal node assumes the role of a domain master.
A streaming (flow) transmission technique is a technique for rapidly transmitting large multimedia files (sound, image, video, and data). By applying the technology, the client can play the multimedia data before the transmission of the whole file is finished, and the effect of playing while transmitting is achieved. The logical channel through which the multimedia file is streamed may be referred to as a stream channel. In the existing power line network, when a flow transmission service needs to be established between two nodes, the node which initiates a flow establishment request is called a source node. A source node sends a request message to a domain master node, wherein the request message carries a flow identifier (flow ID) and a device identifier (device ID) of a destination node (also called an opposite end), and when the domain master node judges that enough time slot resources meet the establishment of a flow channel, the domain master node replies a message to the source node to allow the establishment of the flow channel; then the source node sends a message to the destination node to inform the destination node of establishing a flow channel; if the destination node can support the flow channel, the source node is informed, and then the source node informs the domain main node and the application flow channel to be successfully established. Therefore, the flow channel is established, and the application on the source node can send the service data to the destination node through the flow channel. Of course, during the establishment of the stream channel, if the domain master determines that there are not enough time slot resources or the destination node does not support streaming, the establishment process is terminated.
Since the power line is used to transmit Alternating Current (AC), the power line communication uses 2 AC cycles as Medium Access Control (MAC) cycles of the protocol communication according to the channel characteristics of the power line in the protocol design. In each period, the domain master node uniformly allocates a transmission order to all nodes to occupy a certain shared time slot, or directly allocates a certain time slot (also called a time slot segment or a time slot block) to a node for monopolization. In addition, when performing channel estimation, the domain master node divides the MAC period into a plurality of channel estimation windows, and then performs channel estimation on each channel estimation window to obtain channel transmission parameters corresponding to each channel estimation window, for example, the size of a data block, the forward error correction FEC code rate, a bit loading table (bit loading table), a Robust Communication Mode (RCM), and a KP value of a window (representing a total number of bits that can be carried by one OFDM symbol), where the channel transmission parameters obtained in the channel estimation stage are hereinafter referred to as initial channel transmission parameters X for short. It should be noted that the channel estimation window and the domain master node mentioned above are not the same concept of allocating a "time slot" and a "time slot window" in a transmission time slot for a common node, and the former refers to a window formed by dividing an MAC cycle in a channel estimation stage; and the latter is a transmission resource allocated by the domain master node for the general node. However, since all the MAC cycles are divided, the "time slot" in the allocation of the transmission time slot by the domain master node to the common node may include all or part of at least one channel estimation window.
The channel transmission parameters corresponding to each channel estimation window are not changed unless channel estimation or parameter adjustment is performed again. Thus, each channel estimation window corresponds to a set of transmission parameters, and the quality of the transmission in the channel estimation window depends on the channel conditions and the transmission parameters. If time slots are randomly allocated when a service stream is transmitted, channel estimation windows allocated to the service stream at different times may be different, corresponding channel transmission parameters may naturally be different, and anti-noise capabilities are also different, so that it cannot be guaranteed that channel transmission parameters changing many times always meet the quality requirements of the service stream, and further, when the data accuracy is high and low when a receiving end receives the service stream, jitter is large, and even error codes and flow break may occur, which causes poor user experience.
An embodiment of the present invention provides a method for establishing a power line network flow channel, where a fixed time slot channel is allocated to a service flow S, as shown in fig. 3, the method includes:
step S301: a source node sends a resource request message to a domain master node, wherein the resource request message at least comprises two pieces of indication information which respectively indicate the length of a requested time slot and a channel estimation window set, and the resource request message is used for requesting the domain master node to distribute the time slot of the length in a time slot range corresponding to the channel estimation window set;
if different timeslots are located in different channel estimation windows, the corresponding initial channel transmission parameters may be different, and the different channel transmission parameters reflect different channel conditions, so the source node generally screens the channel estimation window that can meet the transmission quality requirement of the service stream according to the initial channel transmission parameters corresponding to each window. The resource request message in step S301 indicates that a time slot with a certain length is to be selected in a time slot range corresponding to which channel estimation windows, that is, a channel estimation window capable of meeting the transmission quality requirement of the service stream is screened out according to the initial channel transmission parameter X, and is used to request the domain master node to allocate time slot resources to the source node in the time slot range corresponding to one or more channel estimation windows meeting the transmission requirement of the service stream.
As an alternative embodiment, before step S301, the source node may perform information interaction with the source node to obtain a currently idle timeslot.
Step S303: the domain master node sends a time slot authorization message to the source node according to the received resource request message, wherein the time slot authorization message is used for indicating a time slot T allocated to the source node;
as an example, the timeslot grant message includes location information within a MAC cycle of a timeslot assigned to the source node; such as a start time and an end time, or other information indicating the length and location of the allocated time slot, including the number of the time slot block in the MAC cycle. Further, the time slot authorization information further includes the number k of MAC cycles, which is used to indicate that a certain time slot in each MAC cycle in the k MAC cycles is allocated to the source node for use.
The step may further comprise: the domain master node firstly inquires whether enough idle time slots meet the request of the source node, and if the idle time slot resources are enough, the domain master node allocates the time slots for the source node according to the resource request message; at this time, the allocated slot length is equal to the slot length requested by the source node.
As another case, if the idle time slot is smaller than the request of the source node, the domain master node may also send the actual idle time slot information to the source node; at this time, the allocated time slot length is smaller than the time slot length requested by the source node. As another embodiment, in this case, the domain master node may also directly reject the time slot resource request of the source node, and terminate the flow channel establishment procedure.
Step S305: after receiving the time slot authorization message, the source node judges whether an initial channel transmission parameter X corresponding to the time slot T can meet the transmission quality requirement of a service stream S, and when the initial channel transmission parameter X cannot meet the transmission quality requirement of the service stream S, recalculating according to the transmission quality requirement of the service stream S and obtaining a new channel transmission parameter X'; when satisfied, no recalculation is required, i.e., no subsequent adjustment of channel transmission parameters is required. The recalculation and obtaining of the new channel transmission parameter X 'is an adjustment based on the initial channel transmission parameter X, and it should be noted that, at this time, only X' is calculated, but is not configured to the channel for validation.
It should be noted that, as described in step S301, when the source node sends the resource request message, the source node may screen a channel estimation window that can satisfy the service flow according to the initial channel transmission parameter X obtained in the channel estimation stage, but such screening is generally coarse screening, and a certain range of errors is allowed. Correspondingly, according to the resource request message, the domain master node may or may not substantially satisfy the transmission requirement of the service stream S for the channel transmission parameters corresponding to some time slots allocated to the source node, and if the resource request message is the source request message, the source node does not need to adjust or update the channel transmission parameters, and naturally does not need to recalculate the channel transmission channel.
Specifically, the quality requirement of the service stream S includes one or more of the indexes such as the minimum delay requirement, the maximum error rate requirement, the minimum rate requirement, and the minimum bandwidth requirement. The channel transmission parameters corresponding to the time slot T include: one or more of the parameters of the size of a transmission data block of the channel, the FEC code rate, the Bitloading table, the RCM mode, the KP value of the window and the like. The relation between the performance index of the service flow and the channel transmission parameter is a general technique in the field, and it is also a prior art to adjust the latter to meet the former requirement, so how to calculate the channel transmission parameter is not described in depth in this implementation.
Step S307: the source node sends a flow channel establishment request message to a destination node, wherein the flow channel establishment request message comprises the indication information of the allocated time slot T, channel transmission parameters and the identification of a service flow S;
the channel transmission parameter in the flow channel establishment request message may be the new channel transmission parameter X' and the initial channel transmission parameter X in step S205; if the channel transmission parameter is recalculated, the channel transmission parameter in the flow channel establishment request message is X', otherwise, the channel transmission parameter is X.
Step S309: after receiving the flow channel establishment request message, the destination node determines that the destination node itself meets the condition of establishing a service flow channel according to the indication information of the time slot T and the channel transmission parameter in the flow channel establishment request message, and then executes step S311;
as another embodiment, if the destination node determines that it does not have the capability of establishing a traffic flow channel according to the indication information of the time slot T and the channel transmission parameter in the flow channel establishment request message, the flow channel establishment procedure is terminated, and a notification message is sent to the source node according to the prior art.
Step S311: the destination node sends a confirmation message to the source node, and the confirmation message is used for indicating that the destination node agrees to establish a service flow channel according to the requirement;
after receiving the acknowledgement message, the source node basically completes the channel negotiation process, and may start to occupy the time slot T to be dedicated to transmitting the service stream S.
As an alternative embodiment, the method further includes step S313: if the source node recalculates the channel transmission parameter in step S305, after step S311, the source node configures the channel with the new channel transmission parameter X'.
As an optional embodiment, the method further includes step S315: the source node sends a notification message to the domain master node, so as to notify the source node that the time slot T is occupied, and further, may notify that a channel dedicated to transmitting the service stream S, occupying the time slot T, is established.
And the establishment of the flow channel for transmitting the service flow S between the source node and the destination node is finished. Then, the source node may use the corresponding channel transmission parameter to occupy the time slot T to transmit the service stream S to the destination node, and also may send the adjusted channel transmission parameter to the destination node in the transmission data packet; the destination node can adjust local parameters in time according to the received channel transmission parameters, and ensure high-quality reception of the service stream S. In this embodiment, a fixed time slot is allocated to a service stream, and a corresponding transmission parameter is matched, so that even if a network environment changes, the time slot for transmitting the service stream and the corresponding transmission parameter do not change, which can ensure the transmission quality of the service stream, and bring good experience to a user.
As another alternative, step S303 further includes the domain master sending an indication message to the destination node, so as to inform the destination node of the time slot allocated to the source node. Thus, in step S309, the destination node can determine that the source node has indeed obtained the corresponding time slot authorization, and can establish a traffic channel according to the requirement of the source node; if at least part of the time slot information sent to the destination node by the source node is not authorized by the domain master node, the flow channel establishment request of the source node is refused, and the malicious initiation of the flow establishment request is prevented if some nodes are not authorized by the time slot resource of the domain master node.
When the established flow channel needs to be terminated, the service flow transmission is terminated among the source node, the domain main node and the destination node through the interactive message, and meanwhile, the occupied time slot window is released between the source node and the domain main node through the interactive message.
Although the source node and the destination node are described as common nodes, as an embodiment, if the source node is the domain master node, the information interaction between the source node and the domain master node described in the above embodiment is the internal information transmission process of the source node, and the timing sequence and steps are substantially consistent with the above embodiment. Similarly, if the destination node is the domain master node, the information interaction between the destination node and the domain master node described in the above embodiment is the internal information transmission process of the destination node, and the timing sequence and steps are substantially the same as those in the above embodiment.
In addition, if the destination node also needs to transmit the service flow to the source node, the destination node is converted into the role of the source node, and a flow channel is additionally established through the flow.
In a scenario, when the distance between the source node and the destination node is relatively long and the relay node is needed to transmit information, the process before step S307 remains unchanged, and step S307 is that the relay node first receives the flow channel establishment request sent by the source node, and then this embodiment is shown in fig. 4, and further includes:
step S301': after the relay node receives the flow channel establishment request sent by the source node, the relay node can serve as a new source node role to send a new resource request message to the domain master node (similar to step S301);
step S303': the domain master node sends new time slot authorization information to the relay node, wherein the new time slot authorization information is used for indicating a time slot T' allocated to a source node; (similar to step S303);
step S305': after receiving the time slot authorization message, the relay node judges whether the initial channel transmission parameter corresponding to the time slot T' can meet the transmission quality requirement of a service stream S, and if not, recalculates according to the transmission quality requirement of the service stream S to obtain a new channel transmission parameter X "; if so, no recalculation is required. (similar to step S305);
step S307': and the relay node sends a new flow channel establishment request message to the destination node. The new flow channel establishment request message includes information of the time slot T' allocated to the relay node, channel transmission parameters, and an identification of a traffic flow S (similar to step S307);
step S309': after receiving the flow channel establishment request message, the destination node determines that the destination node itself satisfies the condition of establishing a traffic flow channel according to the indication information of the time slot T and the channel transmission parameter in the flow channel establishment request message, and then executes step S311' (similar to step S309); and
step S311': the destination node sends a confirmation message to the relay node, which is used to indicate that the destination node agrees to establish a traffic flow channel as required (similar to step S311);
step S313': if the source node recalculates the channel transmission parameters in step S305', after step S311, the source node configures the channel with the new channel transmission parameters X' (similar to step S313);
step S315': the relay node sends a notification message to the domain master node, so as to notify the source node that the time slot T 'is occupied, and further, the relay node can notify that a channel dedicated to the transmission of the service stream S, which occupies the time slot T', is established. (similar to step S315')
In the corresponding step S311, the relay node sends a confirmation message to the source node, so as to indicate that the relay node agrees to establish a traffic flow channel according to the requirement.
The steps S315' and S311 are executed without strict sequence relationship, and may be sent simultaneously or sent first.
Steps S313 and S315 after step S315' in fig. 4 are kept the same as those in fig. 3.
When information needs to be transmitted between a source node and a destination node in sequence through a plurality of relay nodes, each relay node repeats the steps, and after a domain master node is requested to allocate time slot resources, newly allocated time slot window information, corresponding transmission parameters and the identification of a service flow S are constructed into a flow channel establishment request message to be sent to the next relay node. Details are not repeated.
It should be added that, although the above embodiments are directed to a scenario in which the time division multiplexing transmission resources are different time slots in the power line communication, the above embodiments are directed to a time slot channel; if the allocated transmission resources are further limited in the frequency spectrum, the above procedures and processes are also practical, and only the indication information about the timeslot in each step needs to be further limited to the timeslot indication information on the specific frequency spectrum.
As shown in fig. 5, a power line communication apparatus 500 provided in an embodiment of the present application may include a transceiver 501, a processor 502, and a memory 503, where the transceiver 501, the processor 502, and the memory 503 are coupled to each other. The transceiver 501 may be configured to support the power line communication apparatus 500 for communication, for example, to receive and/or transmit messages through a communication medium such as a power line, and may specifically include a PLC communication module and a coupler; the processor 501 may be used to control the transceiver 501 and the memory 503, read data from the memory 503, execute software programs, process data from software programs, and so on. The memory 502 may be used to store instructions (or programs) and data.
The processor 502 is configured to execute computer instructions, which in cooperation with the transceiver 501 and the memory 503, make the power line communication apparatus 500 operable to perform the steps performed by the source node in the above method embodiments. The method specifically comprises the following steps:
the transceiver 501 may be configured to send a resource request message to a domain master node, where the resource request message at least includes two pieces of indication information, which respectively indicate a length of a requested time slot and a channel estimation window set, and the resource request message is used to request the domain master node to allocate a time slot of the length within a time slot range corresponding to the channel estimation window set; receiving a time slot authorization message sent by the domain master node according to the resource request message, wherein the time slot authorization message is used for indicating a time slot T allocated to the source node; sending a flow channel establishment request message to a destination node, wherein the flow channel establishment request message comprises the indication information of the allocated time slot T, a channel transmission parameter and an identifier of a service flow S; the channel transmission parameter is an initial channel transmission parameter X corresponding to a channel estimation window covered by the time slot T, or a channel transmission parameter X' adjusted based on the initial channel transmission parameter;
the processor 502 is configured to recalculate and obtain a new channel transmission parameter X' according to the transmission quality requirement of the service flow S.
Further, the processor 502 first determines whether the initial channel transmission parameter X corresponding to the time slot T can meet the transmission quality requirement of the service stream S, and if not, recalculates according to the transmission quality requirement of the service stream S to obtain a new channel transmission parameter X'; when satisfied, no recalculation is required.
The transceiver 501 is further configured to start to occupy the time slot T and transmit a service stream S by using the channel transmission parameter after receiving a confirmation message sent by the destination node, where the confirmation message is used to indicate that the destination node agrees to establish a service stream channel as required.
As an alternative embodiment, the transceiver 501 is further configured to perform information interaction with a source node, and acquire a currently idle timeslot.
As an optional embodiment, the transceiver 501 is further configured to send a notification message to the domain master node, where the notification message is used to notify the domain master node that the source node occupies the time slot T. After the transceiver 501 receives the acknowledgement message, if the processor 502 recalculates the channel transmission parameter before, the transceiver 501 configures the channel by using the new channel transmission parameter X'; the service stream S is then transmitted using the reconfigured channel.
The memory 503 is configured to store channel transmission parameters corresponding to each time slot; further, the corresponding relationship among the time slot T, the corresponding channel transmission parameter, and the identifier of the service stream S is saved.
It should be noted that the power line communication apparatus 500 in this embodiment plays a role as a source node to execute steps corresponding to the source node in fig. 3 or fig. 4, and the detailed description thereof also applies to the actions executed by the transceiver 501, the processor 502, and the memory 503 system in this embodiment, which is not described herein again.
Based on the same concept as the method embodiments, embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, cooperates with a transceiver to perform the method performed by the source node in any one of the possible implementations of the method embodiments and the method embodiments.
Based on the same concept as the method embodiments, the present application further provides a computer program product, which when being invoked by a computer, can enable the computer to implement the method performed by the source node in any one of the possible implementations of the method embodiments and the method embodiments in cooperation with the transceiver.
Based on the same concept as the method embodiments described above, the present application also provides a chip or a chip system, which may include a processor. The chip may further include or be coupled with a memory (or a storage module) and/or a communication interface (or a communication module), where the communication interface (or the communication module) may be used to support the chip for wired and/or wireless communication, and the memory (or the storage module) may be used to store a program that is called by the processor to implement the method performed by the source node in any of the possible implementations of the method embodiments and the method embodiments described above. The chip system may include the above chip, and may also include the above chip and other discrete devices, such as a memory (or a storage module) and/or a communication interface (or a communication module). Wherein the communication module comprises the PLC communication module in fig. 2A or a combination of the PLC communication module and the coupler.
Based on the same concept as the method embodiment, the present application also provides a communication system, which may include the power line communication apparatus in the embodiment corresponding to fig. 5 above. The communication system may be configured to implement the method described above in any one of the possible implementations of the method embodiments. Illustratively, the communication system may have a structure as shown in fig. 1. Wherein the source node may be a first or a second power line communication device in the power line communication system described in fig. 1.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (17)
1. A power line network flow channel establishing method is characterized by comprising the following steps:
a source node sends a resource request message to a domain master node; the resource request message at least comprises two pieces of indication information which respectively indicate the length of the requested time slot and a channel estimation window set, and the resource request message is used for requesting the domain master node to allocate the time slot with the length in the time slot range corresponding to the channel estimation window set;
the source node receives a time slot authorization message sent by the domain master node according to the resource request message, wherein the time slot authorization message is used for indicating a time slot T allocated to the source node;
the source node sends a flow channel establishment request message to a destination node, wherein the flow channel establishment request message comprises the indication information of the allocated time slot T, channel transmission parameters and the identification of a service flow S; wherein the channel transmission parameter is an initial channel transmission parameter X corresponding to a channel estimation window covered by the time slot T, or a channel transmission parameter X' recalculated based on the initial channel transmission parameter;
the source node receives a confirmation message sent by the destination node, wherein the confirmation message is used for indicating that the destination node agrees to establish a traffic flow channel according to requirements;
and the source node starts to occupy the time slot T and transmits the service stream S by utilizing the channel transmission parameter.
2. The method of claim 1, wherein before the source node sends a flow path setup request message to a destination node, the method further comprises: and the source node judges whether the initial channel transmission parameter corresponding to the time slot T can meet the transmission quality requirement of the service stream S, and if not, recalculates according to the transmission quality requirement of the service stream S to obtain the channel transmission parameter X'.
3. The method of claim 2, wherein when the channel transmission parameter is a channel transmission parameter recalculated based on the initial channel transmission parameter, after the source node receives the acknowledgement message, the method further comprises: and the source node configures the channel by using the recalculated channel transmission parameters.
4. A method according to any one of claims 1 to 3, wherein the time slot grant message further includes location information within the MAC cycle of the time slot allocated to the source node.
5. A method according to any one of claims 2 to 3, wherein the transmission quality requirements of the traffic stream S include one or more of a minimum delay requirement, a maximum error rate requirement, a minimum rate requirement and a minimum bandwidth requirement.
6. The method according to any of claims 1 to 3, wherein said set of channel estimation windows is at least one channel estimation window that satisfies the transmission quality requirements of the traffic stream S.
7. The method according to any one of claims 1 to 3, wherein the channel transmission parameters corresponding to the time slot T comprise: one or more of a size of a transmission data block of the channel, a forward error correction, FEC, code rate, a bit loading table, a robust communication mode, and a KP value of the window.
8. The method of claim 1, wherein the source node sending a flow path establishment request message to a destination node comprises: the source node sends a flow channel establishment request message to a destination node through a relay node; the source node receiving the acknowledgement message sent by the destination node comprises the source node receiving the acknowledgement message sent by the destination node through a relay node.
9. The method of any of claims 1 to 3, wherein the source node sends a notification message to the domain master node to notify the domain master node that the source node has occupied time slot T.
10. A power line communication apparatus comprising a transceiver (501), a processor (502) and a memory (503), wherein,
the transceiver (501) is configured to send a resource request message to a domain master node, where the resource request message at least includes two pieces of indication information, which respectively indicate a length of a requested time slot and a channel estimation window set, and the resource request message is used to request the domain master node to allocate the time slot of the length within a time slot range corresponding to the channel estimation window set; receiving a time slot authorization message sent by the domain master node according to the resource request message, wherein the time slot authorization message is used for indicating a time slot T allocated to a source node; sending a flow channel establishment request message to a destination node, wherein the flow channel establishment request message comprises the indication information of the allocated time slot T, the channel transmission parameter and the identification of a service flow S; wherein the channel transmission parameter is an initial channel transmission parameter X corresponding to a channel estimation window covered by the time slot T, or a channel transmission parameter X' adjusted based on the initial channel transmission parameter;
the memory (503) is used for storing channel transmission parameters corresponding to each time slot;
the transceiver (501) is further configured to start to occupy the time slot T and transmit a traffic stream S using the channel transmission parameter after receiving a confirmation message sent by the destination node, where the confirmation message is used to indicate that the destination node agrees to establish a traffic stream channel as required.
11. The apparatus of claim 10, wherein the processor (502) is further configured to determine whether the initial channel transmission parameter X corresponding to the time slot T can satisfy the transmission quality requirement of the service stream S, and if not, recalculate and obtain a new channel transmission parameter X' according to the transmission quality requirement of the service stream S.
12. The apparatus of claim 11, wherein the transceiver (501) is further configured to configure a channel with the new channel transmission parameter X'.
13. The apparatus of any of claims 10 to 12, wherein the slot grant message includes location information within a MAC cycle of a slot assigned to the source node.
14. The apparatus according to any of the claims 11 to 12, characterized in that the transmission quality requirements of the traffic stream S comprise one or more of a minimum delay requirement, a maximum error rate requirement, a minimum rate requirement and a minimum bandwidth requirement.
15. The apparatus according to any of claims 10 to 12, wherein the channel transmission parameters corresponding to the timeslot T comprise: one or more of a size of a transmission data block of the channel, a forward error correction, FEC, code rate, a bit loading table, a robust communication mode, and a KP value of the window.
16. The apparatus according to any of the claims 10 to 12, wherein said transceiver (501) is further configured to send a notification message to said domain master node for notifying said domain master node that said source node has occupied time slot T.
17. A power line communication system comprising a source node, a destination node and a domain master node, wherein the source node is an apparatus as claimed in any one of claims 10 to 16.
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| CN202010982625.8A CN114204964B (en) | 2020-09-17 | 2020-09-17 | Power line network flow channel establishing method, device and system |
| PCT/CN2021/110170 WO2022057479A1 (en) | 2020-09-17 | 2021-08-03 | Method, apparatus, and system for establishing power-line network flow path |
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| CN202010982625.8A CN114204964B (en) | 2020-09-17 | 2020-09-17 | Power line network flow channel establishing method, device and system |
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| CN1843023A (en) * | 2003-08-29 | 2006-10-04 | 索尼电子有限公司 | Ultra-wide band wireless / power-line communication system for delivering audio/video content |
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| CN106506043A (en) * | 2016-11-04 | 2017-03-15 | 重庆邮电大学 | Data transmission method, control device and equipment in a kind of PLC system |
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