CN113938161A - Power line communication PLC method and device - Google Patents

Power line communication PLC method and device Download PDF

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Publication number
CN113938161A
CN113938161A CN202010608029.3A CN202010608029A CN113938161A CN 113938161 A CN113938161 A CN 113938161A CN 202010608029 A CN202010608029 A CN 202010608029A CN 113938161 A CN113938161 A CN 113938161A
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node
information
time slot
indication information
nodes
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CN113938161B (en
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蔡文超
曾焱
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2021/102345 priority patent/WO2022001867A1/en
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Small-Scale Networks (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The application discloses a PLC method and a PLC device. In the method, a first node in a PLC network generates first information and sends the first information, wherein the first information comprises first indication information, and the first indication information is used for indicating the time slot occupation sequence of other nodes except the first node in the PLC network and indicating whether the first node occupies the next time slot. Through the first information, other nodes in the PLC network can determine the time slot occupied by the other nodes, and the first node is not required to send MAP information in each MAC period, so that the influence of instability of the PLC network is small, the waste of transmission time and bandwidth can be reduced, and the communication efficiency of the PLC network is improved. In addition, in the scheme of the application, other nodes in the PLC network can determine the time slots occupied by the other nodes according to the time slot occupation sequence indicated by the first information, so that different nodes can occupy different time slots, thereby avoiding the data information of different nodes from conflicting and improving the communication efficiency of the PLC network.

Description

Power line communication PLC method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a PLC method and apparatus for power line communications.
Background
Power Line Communication (PLC) is a communication method for transmitting data and media information through a power line. In a PLC system, a first node and a plurality of second nodes connected to the first node are generally included. The first node can be used as a modem in a PLC system, and during communication, the first node and each second node usually perform information transmission through different time slots in order to reduce information interference.
Currently, the time slot occupied by each second node is usually determined by a unified scheduling method or a contention method. In the unified scheduling mode, the first node allocates time slots for the second nodes in a unified manner. Specifically, referring to the scenario diagram shown in fig. 1, in this manner, the first node performs a Dynamic Bandwidth Allocation (DBA) calculation every other Media Access Control (MAC) period, and determines whether each second node can occupy a channel in the next MAC period through the DBA calculation, so as to generate and transmit Medium Access Plan (MAP) information for bandwidth allocation, where the MAP information is used to indicate the second node that can occupy a timeslot in the next MAC period. Each second node can determine whether it can occupy the time slot of the next MAC cycle through the MAP information. In addition, in a contention mode, a second node which needs to send information monitors the occupation condition of a channel, and when the channel is monitored to be occupied currently, the second node monitors again after waiting for a period of time; and when the idle channel is sensed, the second node determines the current occupiable channel.
However, the PLC network is not stable, and when the time slot occupied by each second node is determined in a unified scheduling manner, the MAP information is sometimes lost in the transmission process. When MAP information of a certain MAC cycle is lost, the second node cannot determine whether it can occupy a time slot of the next MAC cycle, and therefore the second node is in a waiting state in the next MAC cycle until the MAP information is acquired again. Therefore, this method will cause waste of transmission time, increase transmission delay, and reduce communication efficiency. In addition, when the time slot occupied by each second node is determined through a contention mode, if there are multiple second nodes that need to send information, the multiple second nodes send information at the same time after sensing that the channel is idle, which causes information collision, affects information sending, and also reduces communication efficiency.
Disclosure of Invention
In order to solve the problem of low communication efficiency of a PLC in the prior art, embodiments of the present application provide a PLC method and apparatus for power line communication.
In a first aspect, an embodiment of the present application provides a PLC method for power line communication, where the method is applied to a PLC network, where the PLC network includes a first node and at least one other node, and the method includes:
the first node generates first information, wherein the first information comprises first indication information, the first indication information is used for indicating the time slot occupation sequence of other nodes except the first node, and the first indication information is also used for indicating whether the first node occupies the next time slot;
the first node sends the first information.
Through the steps, at least one second node in the PLC network can determine the time slot occupied by the second node according to the first information sent by the first node, the first node is not required to send MAP information in each MAC period, the influence of instability of the PLC network is small, waste of transmission time and bandwidth can be reduced, the communication efficiency of the PLC network is improved, different nodes can occupy different time slots, and therefore collision of data information of different nodes is avoided.
In an optional design, the first information further includes data information, the other nodes include the second node, and the method further includes:
the first node receives feedback information sent by a second node, wherein the feedback information comprises second indication information and third indication information, the second indication information is used for indicating whether the second node sending the feedback information correctly receives the data information, and the third indication information is used for indicating whether the second node sending the feedback information occupies a next time slot.
Through the feedback information, whether the second node sending the feedback information occupies the next time slot or not can be determined, and if the third indication information indicates that the second node sending the feedback information occupies the next time slot, the first node and other second nodes in the PLC network cannot occupy the next time slot, so that the data information of different nodes can be prevented from being collided.
In an optional design, the third indication information is further used to indicate a time slot occupation sequence of other nodes except the second node that sends the feedback information.
Through the steps, other nodes in the PLC network can also determine the time slot which can be occupied by the other nodes according to the third indication information.
In an optional design, the first information is a data physical layer MSG PHY frame, and the MSG PHY frame includes a first frame header, and the first frame header includes the first indication information;
the feedback information is an acknowledgement physical layer (ACK) PHY frame, the ACK PHY frame comprises a second frame header, and the second frame header comprises the third indication information.
In an optional design, the first information further includes fourth indication information, where the fourth indication information is used to indicate whether the first node correctly receives a last piece of received information.
In an optional design, the first information is an ACK PHY frame, and the ACK PHY frame includes a second frame header, and the second frame header includes the fourth indication information.
In an optional design, the first information is a bottom-supported physical layer Final PHY frame, where the Final PHY frame includes a third frame header, and the third frame header includes the first indication information.
In an alternative design, the method further comprises:
and in a first time period after the first indication information is sent, if the other nodes are in a silent state, the first node sends the first information again.
Through the steps, the phenomenon that the at least one second node cannot send the data information because the at least one second node does not receive the first information can be avoided.
In an alternative design, the slot occupancy order is indicated by a difference between node identifications, including an identification of the first node and an identification of the second node.
The data volume of the difference value between the node identifications is small, the time slot occupation sequence is indicated by the difference value between the node identifications, the data volume of the first information can be saved, the occupation of network resources is reduced, and the communication efficiency of the PLC network is improved.
In a second aspect, an embodiment of the present application provides a PLC method for power line communication, where the method is applied to a PLC network, where the PLC network includes at least two nodes, where the at least two nodes include a first node and a second node, and the method includes:
the second node receives first information, wherein the first information comprises first indication information, the first indication information is used for indicating the time slot occupation sequence of other nodes except the first node, and the first indication information is also used for indicating whether the first node occupies the next time slot;
and if the second node is arranged at the head of the time slot occupation sequence in the time slot occupation sequence indicated by the first indication information and the first node does not occupy the next time slot indicated by the first indication information, the second node determines to occupy the next time slot.
Through the steps, the second node in the PLC network determines the occupied time slot according to the time slot occupied sequence indicated by the first information, so that the first node is not required to generate and send MAP information in each MAC period, the influence of instability of the PLC network is small, the waste of transmission time and bandwidth is reduced, the communication efficiency can be improved, and the information of different nodes can be prevented from conflicting.
In an alternative design, the at least two nodes further include a third node, and the method further includes:
if the second node is arranged at the second position of the time slot occupation sequence, the third node is arranged at the first position of the time slot occupation sequence, and the first indication information indicates that the first node does not occupy the next time slot, the second node occupies the time slot after the third node completes data information transmission after waiting for the third node to complete data information transmission, or the second node occupies the time slot after the preset time length after waiting for the third node to silence for the preset time length.
Through the steps, the data information sent by the second node and the data information sent by the third node can be prevented from conflicting, and the communication efficiency of the PLC network is improved.
In an optional design, the at least two nodes further include a fourth node, and the fourth node further sends feedback information, and the method further includes:
if the time slot occupation sequence indicated by the first indication information is in the first position of the time slot occupation sequence, the second node is arranged at the head of the time slot occupation sequence, the first indication information indicates that the first node does not occupy the next time slot, and when the feedback information sent by the fourth node indicates that the fourth node occupies the next time slot, the second node keeps a silent state in the next time slot.
Through the steps, when the fourth node is determined to occupy the next time slot according to the feedback information sent by the fourth node, the second node keeps a silent state in the next time slot, so that the data information sent by the second node and the data information sent by the fourth node are prevented from colliding, and the communication efficiency of the PLC network is improved.
In an alternative design, the method further comprises:
and the second node keeps a silent state after failure of resolving the first indication information.
In an alternative design, the first information further includes data information, and the method further includes:
the second node is a receiving node of the data information included in the first information, after receiving the first indication information, the second node sends feedback information through a first channel, the first channel is different from a second channel, and the second channel is a channel occupied when the second node sends the data information through the time slot indicated by the time slot occupation sequence;
the feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node sending the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node sending the feedback information occupies a next time slot.
In an optional design, if the second node is a last second node indicated by the slot occupying order, the method further includes:
if each node in the PLC network is in a silent state within a third time period after receiving the first indication information, or after a fifth node completes sending the data information, or after the second node completes sending the data information, the second node generates and sends the second information, wherein the fifth node is a node that is arranged one bit before the second node in the time slot occupation sequence;
the second information includes second indication information, where the second indication information is used to indicate a time slot occupation sequence of other nodes in the PLC network, and is also used to indicate whether the second node occupies a next time slot.
Through the steps, the second node can also generate and send second information so as to indicate the time slot occupation sequence of other nodes in the PLC network through the second information, and the other nodes in the PLC network can determine the occupied time slots according to the indication of the second information.
In a third aspect, an embodiment of the present application provides a power line communication PLC apparatus, where the apparatus is applied to a PLC network, where the PLC network includes a first node and at least one other node, and the apparatus includes:
a processing unit, configured to generate first information, where the first information includes first indication information, where the first indication information is used to indicate a time slot occupation sequence of the other nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot;
and the transceiving unit is used for transmitting the first information.
In an alternative design, the first information further includes data information, and the other nodes include the second node;
the transceiver unit is further configured to receive feedback information sent by a second node, where the feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node that sends the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node that sends the feedback information occupies a next time slot.
In an optional design, the third indication information is further used to indicate a time slot occupying sequence of other second nodes except for the second node sending the feedback information, or indicate a time slot occupying sequence of the other second nodes and the first node.
In an optional design, the first information is a data physical layer MSG PHY frame, and the MSG PHY frame includes a first frame header, and the first frame header includes the first indication information;
the feedback information is an acknowledgement physical layer (ACK) PHY frame, the ACK PHY frame comprises a second frame header, and the second frame header comprises the third indication information.
In an optional design, the first information further includes fourth indication information, where the fourth indication information is used to indicate whether the first node correctly receives a last piece of received information.
In an optional design, the first information is an ACK PHY frame, and the ACK PHY frame includes a second frame header, and the second frame header includes the fourth indication information.
In an optional design, the first information is a bottom-supported physical layer Final PHY frame, where the Final PHY frame includes a third frame header, and the third frame header includes the first indication information.
In an optional design, in a first time period after the first indication information is sent, if all the other nodes are in a silent state, the transceiver unit is further configured to send the first information again.
In an alternative design, the slot occupancy order is indicated by a difference between node identifications, including an identification of the first node and an identification of the second node.
In a fourth aspect, an embodiment of the present application provides a PLC apparatus for power line communication, where the apparatus is applied to a PLC network, the PLC network includes at least two nodes, where the at least two nodes include a first node and a second node, and the apparatus includes: a transceiving unit and a processing unit;
the transceiver unit is configured to receive first information, where the first information includes first indication information, the first indication information is used to indicate a time slot occupation sequence of the other nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot;
if the second node is arranged at the head of the time slot occupation sequence indicated by the first indication information, and the first indication information indicates that the first node does not occupy the next time slot, the processing unit is configured to determine that the second node occupies the next time slot.
In an alternative design, the at least two nodes further include a third node,
if the second node is arranged at the second position of the time slot occupation sequence, the third node is arranged at the first position of the time slot occupation sequence, and the first indication information indicates that the first node does not occupy the next time slot, the processing unit is further configured to determine that the second node occupies the time slot after the third node completes data information transmission, or the processing unit is further configured to determine that the second node occupies the time slot after the preset time length after the third node waits for a preset time length for silence.
In an alternative design, the at least two nodes further include a fourth node, the fourth node further sending feedback information,
if the second node is arranged at the head of the time slot occupation sequence indicated by the first indication information, and the first indication information indicates that the first node does not occupy the next time slot, and the feedback information sent by the fourth node indicates that the fourth node occupies the next time slot, the processing unit is further configured to determine that the second node maintains a silent state in the next time slot.
In an optional design, the processing unit is further configured to determine that the second node maintains a silence state after the second node fails to resolve the first indication information.
In an optional design, the first information further includes data information, the second node is a receiving node of the data information included in the first information, after receiving the first indication information, the transceiver unit is further configured to send feedback information through a first channel, where the first channel is different from a second channel, and the second channel is a channel occupied when the second node sends information through a time slot indicated by the time slot occupation sequence;
the feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node sending the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node sending the feedback information occupies a next time slot.
In an alternative design, the second node is a last second node indicated by the slot occupation sequence;
if each node in the PLC network is in a silent state within a third time period after receiving the first indication information, or after a fifth node completes sending the data information, or after the second node completes sending the data information, the processing unit is further configured to generate a second information, where the fifth node is a node that is ranked one bit before the second node in the time slot occupation sequence;
the transceiver unit is further configured to send the second information;
the second information includes second indication information, where the second indication information is used to indicate a time slot occupation sequence of other nodes in the PLC network, and is also used to indicate whether the second node occupies a next time slot.
In a fifth aspect, an embodiment of the present application provides a terminal device applied to a PLC network, where the terminal device includes a processor and a memory, where the memory stores a computer program, and the processor executes the computer program stored in the memory, so as to cause the terminal device to perform the method according to the first aspect.
In a sixth aspect, the present application provides a terminal device applied to a PLC network, the terminal device includes a processor and a memory, the memory stores a computer program, and the processor executes the computer program stored in the memory, so as to enable the terminal device to execute the method according to the second aspect.
In a seventh aspect, an embodiment of the present application provides a readable storage medium for storing instructions, which when executed, implement the method according to the first aspect.
In an eighth aspect, the present application provides a readable storage medium for storing instructions, which when executed, implement the method according to the second aspect.
In a ninth aspect, embodiments of the present application provide a computer program product including instructions, which when run on an electronic device, enable the electronic device to implement all or part of the steps in the corresponding embodiments of the first aspect.
In a tenth aspect, embodiments of the present application provide a computer program product including instructions, which, when run on an electronic device, enable the electronic device to implement all or part of the steps in the corresponding embodiments of the second aspect.
In a ninth aspect, an embodiment of the present application provides a PLC system for power line communication, including:
the PLC device according to the third aspect;
the PLC device according to the fourth aspect.
The embodiment of the application provides a PLC method, in which a first node in a PLC network generates and sends first information, wherein the first information comprises first indication information, and the first indication information is used for indicating a time slot occupation sequence of other nodes except the first node and indicating whether the first node occupies a next time slot. Through the first information, other nodes in the PLC network can determine the time slot occupied by the other nodes.
In the first existing scheme (i.e., the scheme for uniformly scheduling the first target node), the first target node needs to generate and send MAP information in each MAC cycle, and each second target node determines whether it can occupy a time slot of the next MAC cycle according to the MAP information received in each cycle.
In the solution provided in this embodiment, after the first node generates the first information, other nodes in the PLC network may sequentially determine time slots that can be occupied by itself according to the time slot occupation sequence indicated by the first information.
Compared with the first scheme in the prior art, in the scheme provided by the embodiment of the application, other nodes in the PLC network can determine the time slot occupied by the other nodes according to the first information sent by the first node, and the first node is not required to send the MAP information in each MAC cycle, so that the influence of instability of the PLC network is small, the waste of transmission time and bandwidth can be reduced, and the communication efficiency of the PLC network is improved.
In addition, in the solution of the embodiment of the present application, other nodes in the PLC network may determine the time slots occupied by themselves according to the time slot occupation sequence indicated by the first information, so that different nodes can occupy different time slots, thereby avoiding data information of different nodes from colliding with each other.
Drawings
Fig. 1 is a schematic diagram of a time slot allocation scenario disclosed in the prior art;
fig. 2 is a schematic diagram of a time slot allocation scenario disclosed in the prior art;
fig. 3 is a schematic workflow diagram of a PLC method disclosed in an embodiment of the present application;
FIG. 4 is a schematic workflow diagram of another PLC method disclosed in an embodiment of the present application;
fig. 5 is a schematic diagram of PHY information in a PLC method according to an embodiment of the present disclosure;
FIG. 6 is a schematic workflow diagram of another PLC method disclosed in an embodiment of the present application;
FIG. 7 is a schematic workflow diagram of another PLC method disclosed in an embodiment of the present application;
fig. 8 is a schematic diagram of information sent by each node in a PLC method disclosed in the embodiment of the present application;
fig. 9 is a schematic structural diagram of a PLC apparatus according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of another PLC device disclosed in an embodiment of the present application;
fig. 11 is a schematic structural diagram of a terminal device disclosed in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.
Hereinafter, the terms "first" and "second" are used for descriptive purposes only. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specified.
For clarity and conciseness of the following descriptions of the various embodiments, a brief introduction to the related art is first given:
PLC is a communication method for transmitting data and media information through a power line. In a PLC network, a plurality of nodes are typically included. Illustratively, in the g.hn standard related to the PLC network, a Domain Master (DM) and an End Point (EP) are generally included in the PLC network; in the IEEE1901.1 standard related to the PLC network, a Central Coordinator (CCO), a Station (STA), and the like are generally included in the PLC network.
In addition, in the PLC network, in order to reduce interference between information of different nodes, different nodes generally transmit data information through different time slots, that is, different nodes occupy different time slots when performing data transmission. At present, the time slot occupied by each node can be determined by unified scheduling or competition.
In a unified scheduling mode, nodes in the PLC network are divided into a first target node and a second target node. When the nodes in the PLC network comprise DM and EP, the DM is the first target node, and the EP is the second target node; and when the nodes in the PLC network comprise the CCO and the STA, the CCO is the first target node, and the STA is the second target node. And, in this method, the first target node allocates time slots to the respective second target nodes collectively. Specifically, referring to the scene diagram shown in fig. 1, in this manner, the first target node performs a Dynamic Bandwidth Allocation (DBA) calculation once every other MAC cycle, and determines whether each second target node can occupy a timeslot of the next MAC cycle through the DBA calculation, so as to generate and send MAP information. Wherein, the MAP information is used to indicate the second target node that can occupy the slot in the next MAC cycle. Specifically, the MAP information generally includes node identifiers of the second target nodes and a corresponding relationship between time slots that the second target nodes can occupy.
After receiving the MAP information, each second target node in the PLC network determines the time slot which can be occupied by the second target node according to the MAP information and the node identification of the second target node, so that the data information can be transmitted through the time slot which can be occupied by the second target node. Specifically, the second target node queries a time slot corresponding to its own node identifier in the MAP information, and takes the time slot corresponding to its own node identifier as a time slot that can be occupied by itself.
If a second target node determines that it can occupy the time slot in the next MAC cycle according to the MAP information, the second target node usually occupies the time slot in the next MAC cycle to send data information. And if one second target node determines that the second target node can not occupy the time slot in the next MAC period according to the MAP information, the second target node temporarily does not transmit the data information.
However, the first target node and the at least one second target node in the PLC network are usually plugged into a socket together with a plug of the household appliance, resulting in a problem of poor stability of the PLC network. Among these, several factors reduce the stability of the PLC network:
(1) plugging and unplugging of the household appliance can bring noise to the PLC network, and the household appliance can also bring noise to the PLC network in a working state, and the noise can influence the stability of the PLC network;
(2) the household appliances can generate electric shock interference, particularly, narrow-band interference can be brought to the PLC network by the broadcast television, and the interference can reduce the stability of the PLC network;
(3) the operating state of the household appliance may change, for example, the washing machine may switch between a rinsing operating state and a dehydrating operating state during operation, the refrigerator may switch between a cooling operating state and a heat-preserving operating state, the air conditioner may shift gears, and the like. Along with the change of the working state of the household appliance, the noise generated by the household appliance also changes, thereby influencing the stability of the PLC network;
(4) the household appliances can cause the change of the channel during working, the more household appliances enter the working state, the more occupied channels are, and the stability of the PLC network can be influenced by the change of the channel.
In the process of determining the time slots occupied by the second target nodes in a unified scheduling mode, the MAP information is sometimes lost in the sending process due to the problem of poor stability of the PLC network.
If the MAP information of a certain MAC cycle is lost, each second target node in the PLC network cannot acquire the MAP information of the MAC cycle, and accordingly, each second target node cannot determine the time slot that can be occupied by itself in the MAC cycle, so that even if the MAP information indicates that a certain second target node occupies the time slot of the next MAC cycle, the second target node is in a waiting state in the next MAC cycle and cannot transmit data information until the second target node acquires the MAP information again. The second target node needs to wait for at least one MAC cycle before acquiring the MAP information again, so that each second target node in the PLC network is in a waiting state within the time of at least one MAC cycle and cannot send data information, which may cause waste of transmission time, increase transmission delay, and reduce transmission efficiency of the PLC network.
For example, when one MAC cycle is 40ms, if MAP information generated by the first target node in a certain MAC cycle is lost, each second target node cannot determine which second target node can occupy a slot of the next MAC cycle according to the MAP information. In this case, each second target node is in a waiting state and does not transmit data information. And each second target node needs to wait for at least one MAC cycle (i.e. wait for at least 40ms) before being able to receive the MAP information, and the waiting time of each second target node increases the transmission delay of the PLC network, wastes transmission time, and reduces the transmission efficiency of the PLC network.
In addition, each node in the PLC network may determine its own occupied time slot through a contention mode, and this scheme is generally implemented based on a contention backoff mechanism such as carrier sense multiple access with contention access (CSMA/CA) with collision avoidance and carrier sense multiple access with contention detection (CSMA/CD). Specifically, in this scheme, if a certain node in the PLC network needs to send data information, the node may listen to the occupation situation of the channel of the PLC network, and if it is listened that the channel of the PLC network is currently occupied, the node may listen again after waiting for a period of time; and if the channel of the PLC network is sensed to be idle, the node occupies the current time slot to send data information.
However, in this method, if there are a plurality of nodes that need to send data information, all of the nodes may listen to the occupancy of the channel of the PLC network, and when it is listened that the channel of the PLC network is idle, all of the nodes may send data information, in this case, the data information sent by the nodes may collide with each other, thereby affecting information transmission and reducing communication efficiency of the PLC network.
In order to clarify the disadvantages of each node in the PLC network when determining its own time slot by the contention method, an example is disclosed, and a schematic diagram of the contention method shown in fig. 2 is disclosed, in which a rectangular frame in fig. 2 represents a channel. In this example, if node 1 in the PLC network needs to send data, node 1 will listen to the PLC network for channel occupancy. The channel is occupied by node 2, so node 1 senses that the channel is busy, in this case, node 1 cannot occupy the current time slot for transmitting data information, and after waiting for t1, node 1 senses the occupation condition of the channel again. However, when the node 1 listens again, the channel is occupied by the node 3, and therefore, the node 1 still listens that the channel is busy, and in this case, the node 2 waits for time t2 and listens to the occupation of the channel again. If the channel is not occupied by other nodes in the PLC network after time t2, the node 1 will sense that the channel is idle, and thus occupy the channel, and send data information through the current time slot.
However, in the process of the node 1 sensing the channel occupation situation, the node 2 may also need to send data, so the node 2 also senses the channel occupation situation, and when the node 1 senses that the channel is idle, the node 2 also senses that the channel is idle, in which case, the node 2 also senses that the channel is idle, and in this case, the node 2 also senses that the channel is occupied to send data information. Therefore, data information sent by the node 1 and the node 2 may collide, resulting in failure of sending data information by the node 1 and the node 2.
According to the above description, determining the time slot occupied by the node in the PLC network through the current unified scheduling manner or the contention manner may result in a low communication efficiency of the PLC network.
In order to solve the problem of low communication efficiency of a PLC in the prior art, embodiments of the present application provide a PLC method and apparatus for power line communication. The PLC method is applied to a PLC network, and the PLC network comprises at least two nodes. For convenience of description, the at least two nodes may include a first node and at least one other node. It is to be understood that, of the at least two nodes, the nodes other than the first node may be referred to as other nodes. The at least one other node may further include a second node, a third node, a fourth node, and the like.
Wherein the first node and the other nodes may be nodes of various forms in a PLC network. Illustratively, in the g.hn standard related to PLC networks, the first node and the second node may be DMs or EPs in the PLC network; in the IEEE1901.1 standard related to the PLC network, the first node and the other nodes may be CCOs or STAs in the PLC network.
In addition, the type of the first node and the type of the other nodes may be the same or different, for example, in g.hn standard related to PLC network, the first node may be a DM and the other nodes may be an EP, or some of the other nodes may be DMs and the rest of the other nodes and the first node may be EPs; in the IEEE1901.1 standard related to the PLC network, some other nodes may be CCOs, and the remaining other nodes and the first node may be STAs, which is not limited in this embodiment of the present invention.
Of course, the first node and the other nodes may also be other types of nodes, which is not limited in this embodiment of the application.
Referring to a work flow diagram shown in fig. 3, a PLC method provided in an embodiment of the present application includes the following steps:
and step S11, the first node generates first information.
The first information includes first indication information, where the first indication information is used to indicate a time slot occupation sequence of the other nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot.
In the solution provided in this embodiment of the present application, a time slot (timeslot) refers to a time slice occupied by each node in a PLC network when performing data transmission, and the length of each timeslot is usually 10 × 2nns, wherein the value range of n is usually 0 to 7 according to the configuration of each node in the PLC network. Illustratively, in a PLC network, n has a value of 5, in which case each time slot has a length of 10 x 25ns。
In the PLC network, a first node sometimes needs to send data information, and in this case, the first node may occupy a time slot of the PLC network to send the data information.
Under a normal condition, when the first node occupies a time slot to send data information, the other nodes in the PLC network are in a silent state, and the time slot cannot be occupied. After the first node finishes sending the data information, one of the other nodes can occupy the time slot so as to avoid the data information of different nodes from colliding.
In addition, the first node may further determine a time slot occupation sequence of the other nodes in the PLC network, and indicate the time slot occupation sequence of the other nodes through the first indication information.
In a PLC network, at least one other node is typically included. If the PLC network comprises more than two other nodes, the first indication information is used for indicating the time slot occupation sequence of the more than two other nodes; if there is only one other node in the PLC network, the first indication information is used to indicate whether the other node can occupy the next time slot.
In addition, the first indication information may also be used to indicate the number of other nodes corresponding to the time slot occupation order. For example, the first indication information is used to indicate the time slot occupation order of five other nodes, and a field may be further included in the first indication information, where the field may indicate a value of "five" to indicate that the first information indicates the time slot occupation order of five other nodes.
And step S12, the first node sends the first information.
In the embodiment of the present application, the first node may generally transmit the first information in a broadcast form. In this case, the other nodes in the PLC network may obtain the first information, and determine the time slot that may be occupied by the other nodes through the first information.
For example, when three second nodes are included in the PLC network and the time slot occupation sequence indicated by the first information is sequentially the second node 1, the second node 2, and the second node 3, after receiving the first information, the second node 1 determines whether the first node occupies the next time slot according to the first indication information, if the first indication information indicates that the first node occupies the next time slot, the second node 1 temporarily does not transmit data information through the time slot (i.e., does not occupy the time slot), and if the first indication information indicates that the first node does not occupy the next time slot, the second node 1 determines that the second node itself may occupy the next time slot.
In addition, since the previous node of the second node 2 is the second node 2 in the time slot occupation sequence, the second node 2 monitors the data information transmission condition of the second node 1, and if it is determined that the second node 1 completes data information transmission according to the monitoring result, or if it is determined that the second node 1 does not transmit information within a period of time according to the monitoring result, the second node 2 determines that it can occupy the current time slot.
Since the previous node of the second node 3 is the second node 2 in the time slot occupation sequence, the second node 3 monitors the data information transmission condition of the second node 2. If it is determined that the second node 2 completes sending the data information according to the monitoring result, or if it is determined that the second node 2 does not send the data information within a period of time according to the monitoring result, the second node 3 determines that it can occupy the current time slot.
As can be seen from the above description, with the PLC method provided in this embodiment of the present application, other nodes in the PLC network can determine their own time slots that can be occupied, and complete sending of data information through their own time slots that can be occupied.
The embodiment of the application provides a PLC method, in which a first node in a PLC network generates and sends first information, wherein the first information comprises first indication information, and the first indication information is used for indicating a time slot occupation sequence of other nodes except the first node and indicating whether the first node occupies a next time slot. Through the first information, other nodes in the PLC network can determine the time slot occupied by the other nodes.
In the first existing scheme (i.e., the scheme for uniformly scheduling the first target node), the first target node needs to generate and send MAP information in each MAC cycle, and each second target node determines whether it can occupy a time slot of the next MAC cycle according to the MAP information received in each cycle.
In the solution provided in this embodiment, after the first node generates the first information, other nodes in the PLC network may sequentially determine time slots that can be occupied by itself according to the time slot occupation sequence indicated by the first information.
Compared with the first scheme in the prior art, in the scheme provided by the embodiment of the application, other nodes in the PLC network can determine the time slot occupied by the other nodes according to the first information sent by the first node, and the first node is not required to send the MAP information in each MAC cycle, so that the influence of instability of the PLC network is small, the waste of transmission time and bandwidth can be reduced, and the communication efficiency of the PLC network is improved.
In addition, in the solution of the embodiment of the present application, other nodes in the PLC network may determine the time slots occupied by themselves according to the time slot occupation sequence indicated by the first information, so that different nodes can occupy different time slots, thereby avoiding data information of different nodes from colliding with each other.
In the solution provided in the embodiment of the present application, the first node may send the first information under a plurality of conditions. In one case, if the first node needs to send data information, first information may be generated in the process of sending the data information, and the first information may further include data information, that is, the first information includes first indication information and the data information that the first node needs to send, so that the first indication information may be sent to each node in the PLC network in the process of sending data.
If the first information further includes data information, referring to the workflow diagram shown in fig. 4, the method further includes the following steps:
and step S13, the first node receives the feedback information sent by the second node.
The feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node sending the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node sending the feedback information occupies a next time slot.
In addition, the other nodes include the second node, and at least one of the other nodes may include the second node.
In this embodiment of the present application, if the first information further includes data information, a destination node of the data information sends feedback information to the first node after receiving the first information. The destination node of the data information may be one second node in the other nodes, or the destination node of the data information may be two or more second nodes in the other nodes. Accordingly, the node that sends the feedback information may be one second node in the other nodes, or may be two or more second nodes in the other nodes.
That is, the first node may receive feedback information sent by at least one second node.
If the first information further includes data information, the first information typically further includes a destination address of the data information, and the destination address is typically located in a frame header of the first information. After the first node sends the first information, other nodes in the PLC network receive the first information, compare the destination address of the data information with the address of the second node, and if a second node in the other nodes determines that the address of the second node is the same as the destination address of the data information, the second node determines that the second node is the destination node of the data information and sends feedback information to the first node.
The feedback information includes second indication information and third indication information, where the second indication information is used to indicate whether the second node that sends the feedback information correctly receives the data information. If the first node determines that the second node sending the feedback information does not correctly receive the data information through the second indication information, the first node may send the data information to the second node again.
In addition, the third indication information is used to indicate whether the second node sending the feedback information occupies a next time slot, and the second node sending the feedback information generally sends the feedback information in a broadcast manner, in which case, each node in the PLC network can generally receive the feedback information. And if the third indication information indicates that the second node sending the feedback information can occupy the next time slot, nodes except the second node sending the feedback information in the PLC network cannot occupy the next time slot, so that the data information of different nodes is prevented from being collided.
Further, the third indication information is further used to indicate a time slot occupation sequence of other nodes except the second node that sends the feedback information, or indicate a time slot occupation sequence of the other second nodes and the first node.
According to the above scheme, the first information may be used to indicate a slot occupying sequence, and the feedback information may also be used to indicate the slot occupying sequence. Accordingly, the nodes in the PLC network may receive information, such as the first information and the feedback information, sent by different nodes to indicate the time slot occupation sequence. If a certain node in the PLC network receives information indicating an occupation sequence of time slots sent by different nodes, the node generally determines an available time slot by using the latest received information indicating an occupation sequence of time slots.
For example, a node in the PLC network first receives the first message sent by the first node, a first indication information in the first information indicates a time slot occupation sequence of other nodes except the first node in the PLC network, and then, the node receives the feedback information of the second node in the PLC network, and the third indication information in the feedback information indicates the time slot occupation sequence of other nodes except the second node sending the feedback information, in this case, if the first information indicates that the first node does not occupy the next time slot and the feedback information indicates that the transmitting node of the feedback information does not occupy the next time slot, the node receiving the first information and the feedback information determines the time slot that the node can occupy according to the time slot occupation sequence indicated by the third indication information in the feedback information.
In the solution provided in the embodiment of the present application, the first information generated by the first node may be of multiple types. Illustratively, the first information is a message physical layer (MSG PHY) frame, and the MSG PHY frame includes a first frame header, and the first frame header includes the first indication information.
If the first node needs to send data information to other nodes, the first node usually sends an MSG PHY frame, and the MSG PHY frame includes the data information that the first node needs to send. In this case, the first indication information may be loaded in the MSG PHY frame of the first node, the MSG PHY frame including the first indication information may be acquired, and the MSG PHY frame including the first indication information may be used as the first information, that is, the first information may be an MSG PHY frame. In addition, in this case, the first indication information is usually located in a first frame header of the MSG PHY frame, where the first frame header may be referred to as a physical layer frame (PHY) frame header
The first indication information is used for indicating whether the first node occupies a next time slot. If the first information is the MSG PHY frame, after other nodes in the PLC network receive the first information, whether the first node occupies the next time slot or not can be determined through the first indication information in the first frame header of the MSG PHY frame. If the first indication information indicates that the first node will occupy the next time slot, the other nodes will not occupy the next time slot, so that the data information sent by the nodes in the PLC network can be prevented from being collided.
For example, in the first frame header of the MSG PHY frame, a "continue send flag" field may be included, which may occupy 1bit, and when the first node needs to occupy the next timeslot, 1 is set in the "continue send flag" field, and when the first node does not need to occupy the next timeslot, 0 is set in the "continue send flag" field, or no character is added in the "continue send flag" field. In this case, the other nodes that receive the MSG PHY frame may determine whether the first node occupies the next timeslot based on the "continuous send flag" field in the first frame header of the MSG PHY frame.
Accordingly, in this embodiment of the present application, the feedback information may be an acknowledgement physical layer frame (ACK PHY) frame. And the ACK PHY frame comprises a second frame header, and the second frame header comprises the third indication information.
In this case, after receiving the ACK PHY frame, the node in the PLC network may determine whether the second node that sends the feedback information occupies the next time slot according to the third indication information included in the second frame header of the ACK PHY frame. Further, if the third indication information is also used to indicate the time slot occupation sequence of the node that receives the ACK PHY frame, the node in the PLC network may also determine the time slot occupied by itself after receiving the ACK PHY frame.
In the above-described embodiment, the case where the first information includes the data information is described. In another case, the first information further includes fourth indication information, where the fourth indication information is used to indicate whether the first node correctly receives the last received information.
In this case, the first node may further receive data information sent by other nodes in the PLC network, and after receiving the data information sent by other nodes, if the first node determines itself to be a receiving node of the data information, the first node feeds back the first information including the fourth indication information.
Illustratively, a certain other node in the PLC network sends data information to the first node, and after the first node receives the data information sent by the other node and determines that the first node is a receiving node of the data information, the first node determines whether the first node correctly receives the data information sent by the other node, and determines the fourth indication information according to the determination result. And the first node also determines the first indication information according to whether the first node needs to occupy the next time slot and the time slot occupation sequence of other nodes in the PLC network. Then, the first node determines and transmits the first information according to the first indication information and the fourth indication information.
In addition, in this scheme, if a piece of received information at the first node indicates that the sending node of the information will occupy the next time slot, the first node will not normally occupy the next time slot, so as to avoid information collision.
In this case, the first information is typically an acknowledgement physical layer frame (ACK PHY) frame, and the ACK PHY frame includes a second frame header including the fourth indication information.
In the solution provided in the embodiment of the present application, the first information may also be a Final physical layer (Final PHY) frame. The Final PHY frame comprises a third frame header, and the third frame header comprises the first indication information.
In this case, the first information transmitted by the first node may be a Final PHY frame. For example, if a first node does not need to send data to other nodes, the first node will not typically generate a MSG PHY frame, in which case the first information generated by the first node may be a Final PHY frame.
In the above examples, different forms of the first information are introduced, respectively, wherein the first information may be a MSG PHY frame, an ACK PHY frame, or a Final PHY frame. To clarify the form of the first information, the present application discloses an example of a PHY frame, which in this example may be as shown in fig. 5.
Referring to the schematic diagram of the PHY frame shown in fig. 5, in this example, the PHY frame generally includes a preamble field (i.e., preamble field), a header (i.e., header), an additional channel estimation (acid) field, a Message Protocol Data Unit (MPDU), and an inter-frame gap (IFG) field.
Among them, in the PHY frame header, a Frame Type (FT) field, a frame-type specific (FTSF) field, and a reserved (i.e., reserved) field are generally included. The type of the PHY frame may be determined by characters included in the FT field, and the type of the PHY frame may include MSG PHY frame, ACK PHY frame, Final PHY frame, and the like.
In addition, the first indication information included in the first information may be loaded in any one of a FT field, an FTSF field, and a reserved field. If there is a space in other fields in the PHY frame header, the first indication information may also be loaded in other fields where there is a space, which is not limited in this embodiment of the application.
Or, in this embodiment of the present application, a new field may be further extended in the PHY frame header, and the first indication information is loaded in the extended new field.
In addition, the scheme provided by the embodiment of the present application may also adopt other forms of PHY frames, which is not limited in the embodiment of the present application.
In the solution provided in the embodiment of the present application, the first node needs to determine an occupation sequence of timeslots of other nodes in the PLC network, so as to generate the first information. The first node can determine the time slot occupation sequence of other nodes in the PLC network in various ways.
In one manner, the first node may determine the timeslot occupation sequence of other nodes in the PLC network through Dynamic Bandwidth Allocation (DBA) calculation.
In another mode, if the first node can receive the feedback information of the second node, because the third indication information in the feedback information can indicate whether the second node sending the feedback information occupies the next time slot, the first node may determine, according to the feedback information, a data sending requirement of the second node sending the feedback information, and further determine, according to the data sending requirement of the second node, an occupation sequence of the time slots.
In one example, after the first node sends the first information, feedback information of the second node 1 is received, where the feedback information indicates that the second node 1 does not need to occupy the next timeslot, and after the first information is sent again, feedback information of the second node 2 is received, where the feedback information indicates that the second node 2 needs to occupy the next timeslot, in this case, the first node may determine that the second node 1 does not need to send data and the second node 2 needs to send data, and accordingly, in the timeslot occupation order determined by the first node, the timeslot occupation order of the second node 2 is before the timeslot occupation order of the second node 1, so that the second node 2 may preferentially occupy timeslots.
Alternatively, in another possible implementation manner, the first node may determine the timeslot occupation sequence through the DBA calculation and the feedback information of the second node. In this case, referring to the workflow diagram shown in fig. 6, the embodiment of the present application includes the following operations:
and step S21, the first node determines the flow rate change of the PLC network.
The traffic of the PLC network refers to the amount of data sent by the PLC network in a unit time, and the traffic of the PLC network can be generally expressed in units of megabits per second (Mbps), gigabits per second (Gbps), and the like. The traffic change rate of the PLC network refers to a magnitude of traffic change of the PLC network.
Step S22, the first node compares the traffic change rate of the PLC network with a first threshold, determines whether the traffic change rate of the PLC network is greater than the first threshold, if so, performs the operation of step S23, and if not, performs the operation of step S24.
And step S23, when the flow rate of change of the PLC network is greater than a first threshold, the first node determines the time slot occupation sequence of other nodes through the feedback information. Then, the operation of step S25 is performed again.
And when the flow rate change of the PLC network is greater than a first threshold value, indicating that the network state of the PLC network is possible to generate mutation, and under the condition, the first node can determine whether a second node sending the feedback information has a data sending requirement or not through the feedback information, and accordingly, the time slot occupation sequence of other nodes is determined.
And step S24, when the flow rate of change of the PLC network is not larger than a first threshold value, the first node determines the time slot occupation sequence of other nodes through DBA calculation. Then, the operation of step S25 is performed again.
And when the flow change rate of the PLC network is not greater than a first threshold value, the network state of the PLC network is relatively stable, and under the condition, the first node can determine the time slot occupation sequence of other nodes through DBA calculation.
And step S25, the first node generates and sends first information.
Through the operations from the step S21 to the step S25, the time slot occupation sequence can be determined according to the network state of the PLC network, and specifically, in the scheme, when the network state of the PLC network is relatively stable, the time slot occupation sequence is determined by a DBA calculation method, and when the network state of the PLC network is not relatively stable, the time slot occupation sequence is determined by feedback information, so that in the process of determining the time slot occupation sequence, the network state of the PLC network is considered, and the time slot occupation sequence determined by the first node is closer to the requirements of each node in the PLC network.
Further, in the embodiment of the present application, the following operations are further included:
and in a first time period after the first indication information is sent, if the other second nodes are in a silent state, the first node sends the first information again.
In this embodiment, a node is in a silent state, which means that the node does not send data information but can receive data information.
In a first time period after the first information is sent, if other nodes in the PLC network are all in a silent state, it indicates that the other nodes have no data sending requirement, or the other nodes do not acquire the first information, so that the time slot that the other nodes can occupy cannot be determined according to the first information. In this case, the first node may send the first information again, so as to avoid a phenomenon that other nodes in the PLC network cannot send data information because the first information is not received.
The duration of the first time period may be generally determined according to the number of other nodes in the PLC network, and generally, the greater the number of other nodes, the longer the duration of the first time period is.
In the solution provided in the embodiment of the present application, the first information is used to indicate a time slot occupation sequence of other nodes in the PLC network. In a possible implementation, the time slot occupation sequence of other nodes in the PLC network may be indicated by the node identifier of each node.
In addition, in another possible implementation manner, the time slot occupying sequence is represented by a difference value between node identifications, where the node identifications include the identification of the first node and the identifications of the other nodes, that is, the time slot occupying sequence is represented by a difference value between the node identification of the first node and the node identifications of the other nodes.
In this case, other nodes in the PLC network can determine the node identifier of the first node through previous interaction with the first node, and in this case, after acquiring the first information, the other nodes can determine the time slot occupied by themselves according to their node identifiers and the node identifier of the first node.
The MAP information in the prior art generally includes a node identifier of each node in the PLC network, and a time slot corresponding to the node identifier. In the implementation manner provided by the application, compared with the node identifiers, the data size of the difference value between the node identifiers is smaller, so that the data size of the first information can be reduced by indicating the time slot occupation sequence through the difference value between the node identifiers, thereby further reducing the network resources required by the first information during transmission and saving the bandwidth resources.
In addition, in this implementation, the first indication information may include a difference value between node identifications sorted in the slot occupying order. For example, the other nodes in the PLC network are configured to include the second node 1, the second node 2, and the second node 3, and if the time slot occupation sequence is the second node 1, the second node 2, and the second node 3 in turn, in this case, in the first indication information, the difference value between the node identifiers of the second node 1 and the first node, the difference value between the node identifiers of the second node 2 and the first node, and the difference value between the node identifiers of the second node 3 and the first node are sequentially ordered.
In this case, the time slot occupation sequence can be determined according to the sequence of the difference values between the node identifiers in the first indication information.
Or, in the first indication information, a sequence number of a time slot occupation sequence corresponding to a difference value between node identifiers may also be included. For example, the other nodes in the PLC network are set to include the second node 1, the second node 2, and the second node 3, and if the time slot occupation sequence is the second node 1, the second node 2, and the second node 3 in sequence, in this case, the first indication information includes not only the difference values between the node identifier of the first node and the node identifiers of the second node 1, the second node 2, and the second node 3, but also the sequence number of the time slot occupation sequence corresponding to each difference value, and indicates the time slot occupation sequence of each second node by using the sequence number.
The present application provides a PLC method according to the above embodiments. To clarify the PLC method, an example is disclosed below.
In this example, the PLC includes a first node and at least one other node, where the other node includes three second nodes, which are a second node 1, a second node 2, and a second node 3, respectively.
The first node may generate first information, where the first information includes first indication information, and the first indication information is used to indicate a time slot occupation sequence of the nodes other than the first node, and indicate whether the first node occupies a next time slot. And, the first node may also transmit the first information in a broadcast form.
If the first node needs to send data information to other nodes, the first node may add the first indication information to the sent data information, in which case, the first information further includes data information. In addition, the first information may be an MSG PHY frame, the MSG PHY frame including a first frame header, the first frame header including the first indication information.
After the first node transmits the first information including the data information, the destination node of the data information may also transmit feedback information. In this example, the first node needs to send data information to the second node 1, and the first information further includes a destination address of the second node 1.
After receiving the first information, other nodes in the PLC network determine whether to acquire the data information included in the first information based on the destination address included in the first information. In this case, the second node 2 and the second node 3 may determine that they do not need to acquire the data information, that is, the second node 2 and the second node 3 are not receiving nodes of the data information, and accordingly, the second node 2 and the second node 3 may not send feedback information.
In addition, after receiving the first information, based on the destination address, the second node 1 may determine that it needs to receive the data information included in the first information, that is, the second node 1 is a receiving node of the data information, and thus may generate and transmit feedback information. The feedback information generally includes second indication information and third indication information, where the second indication information is used to indicate whether the second node that sends the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node that sends the feedback information occupies a next time slot.
When the second node 1 generates the feedback information, if it is determined that the first node occupies the next time slot according to the first indication information included in the first information, the second node 1 usually does not occupy the next time slot, so as to avoid information collision between the second node 1 and the first node, and correspondingly, the third indication information indicates that the second node 1 does not occupy the next time slot. In addition, if it is determined that the first node does not occupy the next time slot according to the first indication information included in the first information, and the second node 1 needs to send data information to other nodes, the second node 1 may occupy the next time slot, and correspondingly, the third indication information may indicate that the second node 1 occupies the next time slot.
Further, the second node 1 may also determine an order of time slot occupation of other nodes (e.g., the first node, the second node 2, and the second node 3), and indicate the determined order of time slot occupation of the other nodes by the third indication information.
The feedback information may be an ACK PHY frame, where the ACK PHY frame includes a second frame header, and the second frame header includes the third indication information.
After generating the feedback information, the second node 1 may send the feedback information in a broadcast manner, and thus, the first node, the second node 2, and the second node 3 typically receive the feedback information.
In this example, the second node 2 and the second node 3 would receive different information indicating the order of occupation of the time slots, in which case the second node 2 and the second node 3 would typically determine the time slots that can be occupied by themselves based on the latest received information. For example, the second node 2 and the second node 3 may receive first information sent by the first node and feedback information sent by the second node 1, where both the first information and the feedback information may indicate an occupation sequence of timeslots, and the receiving time of the feedback information is later, and in this case, the second node 2 and the second node 3 may determine timeslots that may be occupied by themselves according to an indication of the later received feedback information.
In the above description, the case where the first information is the MSG PHY frame is described. In addition, if a first node receives information sent by other nodes, the first node may also generate other forms of first information, where the first information includes, in addition to the first indication information, fourth indication information used to indicate whether the first node correctly receives a last piece of received information.
For example, the first node receives data information sent by the second node 1, and the data information sent by the second node 1 includes a destination address of the first node, in this case, the first node may generate first information including fourth indication information, where the fourth indication information is used to indicate whether the first node correctly receives the data information sent by the second node 1. And if the fourth indication information indicates that the first node does not correctly receive the data information sent by the second node 1, the second node 1 will often send the data information to the first node again after receiving the fourth indication information, so as to avoid the first node missing the data information.
In this case, the first information may be an ACK PHY frame including a second frame header including the fourth indication information.
In addition, if the first node has no requirement for data transmission, the first information transmitted by the first node may also be a Final PHY frame, where the Final PHY frame includes a third frame header, and the third frame header includes the first indication information.
In this example, after the first information, the first node detects the statuses of other nodes (e.g., the second node 1, the second node 2, and the second node 3), and if the other nodes in the PLC network are in the silent status within a first time period after the first information is sent, the first node sends the first information again.
Accordingly, in another embodiment of the present application, a PLC method for power line communication is provided. The method is applied to a PLC network, and the PLC network comprises at least two nodes, referring to a work flow diagram shown in fig. 7, the at least two nodes comprise a first node and a second node, the method comprises:
and step S31, the second node receives the first information.
The first information includes first indication information, where the first indication information is used to indicate a time slot occupation sequence of the other nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot.
In this embodiment of the present application, a first node in the PLC network determines an order of time slot occupation of other nodes than the first node, and generates first information according to the order. Then, the first node sends the first information in a broadcast mode so as to be convenient for other nodes in the PLC network to acquire the first information.
The PLC network generally includes a first node and other nodes other than the first node, where the other nodes include at least one second node, and the second node executing the scheme of the embodiment of the present application may be any one of the at least one second node. In addition, in this embodiment of the application, the other nodes may further include a third node and/or a fourth node, and the like, which is not limited in this embodiment of the application.
In addition, in the solution disclosed in the embodiment of the present application, the PLC network includes a first node and other nodes other than the first node, and the first node and the other nodes may be any node in the PLC network. Illustratively, in the g.hn standard related to PLC networks, the first node and the second node may be DMs or EPs in the PLC network; in the IEEE1901.1 standard related to the PLC network, the first node and the other nodes may be CCOs or STAs in the PLC network.
In addition, the type of the first node and the type of the other nodes may be the same or different, for example, in g.hn standard related to PLC network, the first node may be a DM and the other nodes may be an EP, or some of the other nodes may be DMs and the rest of the other nodes and the first node may be EPs; in the IEEE1901.1 standard related to the PLC network, some other nodes may be CCOs, and the remaining other nodes and the first node may be STAs, which is not limited in this embodiment of the present invention.
Of course, the first node and the other nodes may also be other types of nodes, which is not limited in this embodiment of the application.
Accordingly, in the solution provided in this embodiment of the present application, the second node may be a DM or an EP, or the second node may be a CCO or an STA.
Step S32, if the second node is arranged at the head of the time slot occupation sequence indicated by the first indication information and the first indication information indicates that the first node does not occupy the next time slot, the second node determines to occupy the next time slot.
If the second node is arranged at the head of the time slot occupation sequence, it indicates that the time slot can be occupied by the second node after the first node does not occupy the time slot, in this case, if the first indication information indicates that the first node does not occupy the next time slot, the second node determines to occupy the next time slot.
In the solution provided in this embodiment of the present application, the second node occupying the next time slot means that if the second node has a requirement for data transmission, the second node may occupy the next time slot for data transmission, and if the second node has no requirement for data transmission, the second node maintains a silent state in the next time slot.
In the solution provided in this embodiment, the second node determines whether the first node will occupy the next timeslot according to the timeslot occupation sequence indicated by the received first information, and when the second node is arranged at the head of the timeslot occupation sequence and the first indication information indicates that the first node will not occupy the next timeslot, the second node may occupy the next timeslot. And if the first node has the requirement of data transmission, the second node can transmit data information through the next time slot.
The embodiment of the application provides a PLC method, in the method, a first node in a PLC network generates first information used for indicating a time slot occupation sequence of a second node, and the second node in the PLC network can determine the time slot occupation sequence through the first information and accordingly determine an occupied time slot.
According to the scheme provided by the embodiment of the application, the second node in the PLC network determines the occupied time slot according to the time slot occupied sequence indicated by the first information, so that the first node is not required to generate and send MAP information in each MAC period.
In addition, in the solution of the embodiment of the present application, the second node in the PLC network may determine the time slot occupation sequence according to the first information, so as to avoid the information of different nodes from conflicting, and therefore, compared with the existing second solution (i.e., a contention solution), the solution provided in the embodiment of the present application can also improve the communication efficiency of the PLC network.
Further, in the first prior art, the MAP information includes node identifiers of the second nodes and time slots corresponding to the node identifiers, which results in a large data amount of the MAP information, and the first node needs to generate and send the MAP information once in each MAC cycle, and the MAP information is sent more frequently, which consumes a large amount of bandwidth.
In the solution of the embodiment of the present application, the second node determines the time slot occupied by the second node according to the first information generated by the first node, and the first node does not need to generate and send MAP information in each MAC cycle, so that the frequency of sending information by the first node is reduced, and compared with the MAP information, the data size of the first information is smaller. Therefore, compared with the existing first scheme, the scheme provided by the embodiment of the application can also effectively reduce the waste of bandwidth.
Further, in the solution provided in the embodiment of the present application, the at least two nodes further include a third node, and the method further includes:
if the second node is arranged at the second position of the time slot occupation sequence, the third node is arranged at the first position of the time slot occupation sequence, and the first indication information indicates that the first node does not occupy the next time slot, the second node occupies the time slot after the third node completes data information transmission after waiting for the third node to complete data information transmission, or the second node occupies the time slot after the preset time length after waiting for the third node to silence for the preset time length.
If the third node is silent for a preset time, it indicates that the third node does not need to send data information, and in this case, the second node may occupy the time slot after the preset time.
And if the third node is arranged at the first position of the time slot occupation sequence and the first indication information indicates that the first node does not occupy the next time slot, the third node can occupy the next time slot. In addition, because the second node is arranged at the second position of the time slot occupation sequence in the time slot occupation sequence indicated by the first indication information, after the third node completes sending the data information, the second node may occupy the time slot after the third node completes sending the information, or, the second node determines that the third node does not need to send the data information, and the second node may occupy the time slot after the preset time length.
In addition, in the scheme provided in the embodiment of the present application, the at least two nodes further include a fourth node, and the fourth node further sends feedback information.
The fourth node may be any node in a PLC network. For example, in the g.hn standard related to the PLC network, the fourth node may be a DM or an EP, and in the IEEE1901.1 standard related to the PLC network, the fourth node may be a CCO or an STA, which is not limited in this embodiment.
The feedback information sent by the fourth node may include an indication whether the fourth node needs to occupy the next timeslot. In this case, in the embodiment of the present application, the following steps are further included:
if the time slot occupation sequence indicated by the first indication information is in the first position of the time slot occupation sequence, the second node is arranged at the head of the time slot occupation sequence, the first indication information indicates that the first node does not occupy the next time slot, and when the feedback information sent by the fourth node indicates that the fourth node occupies the next time slot, the second node keeps a silent state in the next time slot.
If the first indication information indicates that the first node does not occupy the next time slot, and the feedback information sent by the fourth node indicates that the fourth node occupies the next time slot, it indicates that the fourth node may occupy the next time slot to send information. In this case, the second node keeps the silent state in the next slot, so that the data information of the second node can be prevented from colliding with the data information sent by the fourth node.
That is to say, in this embodiment of the present application, a second node may receive information sent by different nodes, and if the information sent by a sending node of one of the pieces of information indicates that the sending node will occupy a next time slot, the second node will not normally occupy the next time slot, so as to avoid a collision between data information sent by the second node and data information sent by the sending node.
Further, in the embodiment of the present application, the method further includes the following steps:
and the second node keeps a silent state after failure of resolving the first indication information.
After receiving the first information, the second node analyzes the first indication information included therein, so as to determine the time slot occupation sequence indicated by the first indication information according to the analysis result. However, when the second node analyzes the first indication information, a failure may occur, for example, due to an influence of a PLC network oscillation, and the second node does not receive the complete first indication information, which results in a failure in analyzing the first indication information.
After the second node fails to analyze the first indication information, the second node can keep a silent state and does not send data information because the time slot occupied by the second node cannot be determined by the first indication information.
In addition, if the second node is in the silent state, after the second node receives the information indicating the sequence of occupied time slots again, the second node may generally determine the time slots that can be occupied by itself again and transmit data information through the time slots that can be occupied by itself. For example, when the second node is in a silent state, the second node may further receive first information that is sent again by the first node, and may also receive feedback information that is sent by another node, and the second node may determine a time slot that may be occupied by the second node according to the first information that is sent again by the first node and the feedback information.
The first information sent by the first node may be information in various forms. In one possible implementation, the first information further includes data information. In this case, after receiving the first information, the second node further determines whether the second node is a receiving node of the data information according to a destination address of the data information included in the first information, where if the destination address of the data information included in the first information is the address of the second node, the second node is the receiving node of the data information.
If the second node is a receiving node of the data information included in the first information, the method further includes the steps of:
after receiving the first indication information, the second node sends feedback information through a first channel. The first channel is different from a second channel, and the second channel is a channel occupied by the second node when transmitting data information through the time slot indicated by the time slot occupation sequence.
In the PLC network, a first channel is set for feedback information sent by each node, and the second channel is a channel occupied by the second node when sending data information through a time slot indicated by the time slot occupation sequence, that is, when sending data information and feedback information, each node in the PLC network often occupies different channels, so that the node can send feedback information through the first channel regardless of whether the time slot occupation sequence indicates that a certain node can occupy the time slot.
The feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node sending the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node sending the feedback information occupies a next time slot.
And the second node determines the third indication information according to the data sending requirement of the second node. Wherein, if the first indication information received by the second node indicates that the first node needs to occupy the next time slot, the third indication information generally indicates that the second node does not occupy the next time slot. In addition, if the first indication information received by the second node does not indicate that the first node needs to occupy the next time slot, and the second node needs to send data information, the third indication information generally indicates that the second node occupies the next time slot.
In addition, if the time slot occupation sequence determined by the second node is the same as the time slot occupation sequence determined by the first node, the third indication information may only need to include one preset character. In this case, after receiving the feedback information, the other nodes determine their own slots that can be occupied based on the slot occupation order indicated by the first information.
In this case, since the feedback information only needs to include the preset characters, the data size of the feedback information can be reduced, and therefore, when the feedback information is transmitted, less network resources are consumed, and occupation of bandwidth resources can be reduced.
Further, if the second node is the last second node indicated by the time slot occupying sequence, the method further comprises the following steps:
and if each node in the PLC network is in a silent state in a third time period after the first indication information is received, or after a fifth node finishes sending the data information, or after the second node finishes sending the data information, the second node generates and sends second information. Wherein the fifth node is a node that is one bit before the second node in the time slot occupying sequence.
The second information includes second indication information, where the second indication information is used to indicate a time slot occupation sequence of other nodes in the PLC network, and is also used to indicate whether the second node occupies a next time slot.
And other nodes in the PLC network can receive the second information and determine the time slot which can be occupied by the other nodes according to the second indication information after receiving the second information.
If the second node is the last second node indicated by the time slot occupation sequence, the second node may further generate second information under the following conditions:
(1) and in a third time period after the first indication information is received, all nodes in the PLC network are in a silent state.
If each node in the PLC network is in a silent state in a third time period after the first indication information is received, it indicates that each node in the PLC network does not need to send data, or each node in the PLC network does not successfully analyze information for indicating a time slot occupation sequence, so that data information cannot be sent. In this case, according to the scheme provided by the embodiment of the present application, the second node generates and sends the second information, so that other nodes in the PLC network can determine the time slot that can be occupied by itself according to the received second information.
The duration of the third time period is generally related to the number of nodes in the PLC network, and generally, the greater the number of nodes, the longer the duration of the third time period.
(2) And the fifth node finishes the sending of the data information, wherein the fifth node is a node which is arranged at the front position of the second node in the time slot occupation sequence.
Since the fifth node is arranged one bit before the second node in the time slot occupation sequence, after the fifth node completes sending the data information, the second node may occupy the next time slot, and in this case, the second node may generate and send the second information, so that other nodes in the PLC network may determine the time slot that may be occupied by itself according to the second information.
In addition, if the second node needs to send the data information after the fifth node completes sending the data information, the second information may further include the data information that the second node needs to send.
(3) And the second node completes the sending of the data information.
Since the second node is the last second node indicated by the time slot occupation sequence, after the data transmission of the second node is completed, the second node can generate and transmit second information, so that other nodes in the PLC network can determine the time slot that can be occupied by the second node according to the second information.
The second information may be various forms of information, and in one possible implementation, the second information may be a Final physical layer (Final PHY) frame. In addition, in the second case, if the second node needs to transmit data information, the second information may include the data information transmitted by the second node, and in this case, the second information may also be an MSG PHY frame.
According to the above embodiments, different information indicating the time slot occupation sequence, such as the first information, the second information, and the feedback information, may be received at each node in the PLC network. If a node receives two or more pieces of information indicating the sequence of time slot occupation, the node usually determines the time slot that the node can occupy according to the last received information.
In the above embodiment, a PLC method is provided. In order to clarify the scheme provided by the embodiments of the present application, an example is disclosed below.
In this example, the PLC network includes a first node and at least one other node, where the other node includes three second nodes, which are a second node 1, a second node 2, and a second node 3, respectively, and in addition, the other node in the PLC network may further include a third node, a fourth node, a fifth node, and the like.
The first node may generate first information, where the first information includes first indication information, and the first indication information is used to indicate a time slot occupation sequence of the nodes other than the first node, and indicate whether the first node occupies a next time slot. And, the first node may also transmit the first information in a broadcast form. Other nodes in the PLC network may receive the first information.
And if the first indication information indicates that the first node does not occupy the next time slot, and the second node 1 is arranged at the first position of the time slot occupation sequence, the second node 1 determines that the second node can occupy the next time slot.
If the second node 2 is arranged at the second position of the time slot occupation sequence and the third node is arranged at the head of the time slot occupation sequence, namely the third node is arranged in front of the second node 2, and the first indication information indicates that the first node does not occupy the next time slot, then the second node 2 monitors the sending condition of the data information of the third node and occupies the time slot after the third node completes sending the data information. Or, if the second node 2 monitors that the third node is in a silent state, that is, the third node does not send data information, the second node 2 waits for the preset time duration for the third node to silence, and then the second node occupies the time slot after the preset time duration.
In addition, the first information may further include data information, and a receiving node of the data information is a fourth node, in this case, after receiving the first information, the fourth node may further send feedback information, and accordingly, each node in the PLC network may receive the feedback information.
If the second node 1 is arranged at the head of the time slot occupation sequence in the time slot occupation sequence indicated by the first indication information, and the second node 1 determines that the fourth node occupies the next time slot through the feedback information, the second node 1 keeps a silent state in the next time slot, so as to avoid collision between data information sent by the second node and data information sent by the fourth node.
In addition, if each second node in the PLC network fails to analyze the first indication information, each second node maintains a silent state until receiving the next information indicating the time slot occupation sequence, and determines the time slot that can be occupied by itself through the information received again.
Accordingly, after the third node, the fourth node, and the fifth node in the PLC network fail to resolve the first indication information, the third node, the fourth node, and the fifth node usually keep a silent state until receiving the next information for indicating the timeslot occupation sequence.
The first information may include data information, and in this case, other nodes except the first node in the PLC network determine whether the other nodes are receiving nodes of the data information according to a destination address of the data information included in the first information. Wherein, if the second node 1 is the receiving node, after receiving the first information, the second node 1 may further send feedback information through a second channel.
In addition, if the second node 1 is the last second node indicated by the time slot occupation sequence and each node in the PLC network is in the silent state in the third time period after receiving the first indication information, the second node 1 may generate second information so that other nodes determine their own time slots that can be occupied according to the second information. In this case, the second information may be a Final PHY frame.
Or, if the second node 1 is the last second node indicated by the time slot occupation sequence, and a node that is ranked one bit before the second node in the time slot occupation sequence is a fifth node, the second node 1 may monitor a data transmission condition of the fifth node, and after the fifth node completes transmission of the data information, the second node 1 may generate and transmit the second information.
In this case, the second information may be a Final PHY frame. In addition, if the second node 1 needs to transmit data, the data information that needs to be transmitted may be loaded in the second information, in which case, the second information may also be an MSG PHY frame.
Or, if the second node 1 is the last second node indicated by the time slot occupying sequence, after the second node 1 completes sending the data information, the second node 1 may also generate and send the second information, and in this case, the second information may be a Final PHY frame.
In addition, in this example, a node in the PLC network may often receive a plurality of pieces of information indicating the order of occupation of the time slots, for example, the first information, the feedback information, and the second information may be received. If a node receives two or more pieces of information indicating the sequence of occupied time slots, the node determines the time slots that it can occupy, usually by using the latest received information.
In the above embodiments of the present application, operations performed by a first node and a second node in a PLC network are introduced respectively, in order to clarify the PLC method provided by the present application, the present application discloses an example of the PLC method, and discloses fig. 8, where fig. 8 is a schematic diagram of information sent by each node in the PLC network.
In this example, the PLC network includes four nodes, where any one node may be a first node, the remaining three nodes are second nodes, and the three second nodes are respectively a second node 1, a second node 2, and a second node 3. In this example, the following steps are included:
(1) the first node generates and transmits first information.
If the first node needs to send data information to other nodes, the first information may further include data information, and correspondingly, the first information may be an MSG PHY frame; in addition, if the first node needs to send feedback information to other nodes, the first information may also be the feedback information, and in this case, the first information may be an ACK PHY frame; alternatively, the first information may also be a Final PHY frame.
In addition, if the first information includes data information, the first information also includes a destination address of a receiving node of the data information.
The first information includes first indication information, where the first indication information is used to indicate an order of occupying time slots of the nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot, and the first indication information is usually located in a frame header of the first information.
In this example of the present application, referring to fig. 8, whether the first node occupies the next time slot may be indicated by a "Continue send flag" field, and if the Continue send flag field is set to 1, it indicates that the first node will occupy the next time slot, and if the Continue send flag field is set to 0, it indicates that the first node will not occupy the next time slot. Wherein, the Continue send flag field may generally occupy 1 bit.
In addition, in this example, the time slot occupation order of the other nodes than the first node is indicated by a difference value of the node identification of the first node and the node identification of the at least one second node, wherein the difference value is arranged according to the time slot occupation order. In this case, referring to the example shown in fig. 8, the first information includes a plurality of "next send ID" fields arranged in sequence, each field includes a difference value of node identifications corresponding to one other node, if the other nodes include the second node 1, the second node 2 and the second node 3, and the first node determines that the time slot occupation sequence is the second node 1, the second node 2 and the second node 3 in turn, the first information includes at least three sequentially arranged next send ID fields, a first next send ID field includes a difference between the node identifier of the first node and the node identifier of the second node 1, a second next send ID field includes a difference between the node identifier of the first node and the node identifier of the second node 2, and a third next send ID field includes a difference between the node identifier of the first node and the node identifier of the second node 3. Wherein each next send ID field may typically occupy 2 bits.
In the first information, a field for indicating the number of second nodes corresponding to the time slot occupation sequence may be further included, and this field may be, for example, a "next node number" field, and if the first information is only used for indicating the time slot occupation sequence of three second nodes, this field includes a value of "three".
After generating the first information, the first node transmits the first information in a broadcast mode so that other nodes in the PLC network can acquire the first information.
(2) If the first information comprises data information, after other nodes in the PLC network receive the first information, determining whether the other nodes are the receiving nodes according to the destination addresses of the receiving nodes of the data information in the first information, generating and sending feedback information by the receiving nodes, wherein the feedback information comprises second indication information and third indication information, the second indication information is used for indicating whether the second nodes sending the feedback information correctly receive the data information, and the third indication information is used for indicating whether the second nodes sending the feedback information occupy the next time slot.
In this example, the second node 2 is set as the receiving node of the data information, in this case, after receiving the first information, the second node 2 generates and transmits feedback information, wherein the feedback information may be an ACK PHY frame.
Referring to the schematic diagram shown in fig. 8, in the feedback information, a "will send flag" field may be set, and this field indicates whether the second node sending the feedback information occupies the next timeslot. For example, if the wilsend flag field is set to 1, it indicates that the second node that sends the feedback information will occupy the next time slot, and if the wilsend flag field is set to 0, it indicates that the second node that sends the feedback information will not occupy the next time slot. Also, the wild send flag field may typically occupy 1 bit.
In addition, the second node 2 may also determine a time slot occupation sequence of other nodes in the PLC network, and load the time slot occupation sequence determined by itself in the feedback information. In this case, referring to the schematic diagram shown in fig. 8, the feedback information further includes a plurality of sequentially arranged "next send ID" fields, and the time slot occupation sequence determined by the second node 2 is indicated by the plurality of sequentially arranged "next send ID" fields.
If the time slot occupation sequence determined by the second node 2 is the second node 1, the second node 2 and the second node 3 in sequence, the feedback information at least comprises three sequentially arranged next send ID fields, wherein the first next send ID field comprises a difference value between the node identifier of the first node and the node identifier of the second node 1, the second next send ID field comprises a difference value between the node identifier of the first node and the node identifier of the second node 2, and the third next send ID field comprises a difference value between the node identifier of the first node and the node identifier of the second node 3. Wherein each next send ID field may typically occupy 2 bits.
Or, if the slot occupying sequence determined by the second node 2 is the same as the slot occupying sequence indicated by the first information, the feedback information may not include the next send ID field, but include a specific character by which the slot occupying sequence determined by the second node 2 is the same as the slot occupying sequence indicated by the first information.
(3) In this example, the second node 2 does not occupy the next time slot, i.e. the wilsend flag field in the feedback information sent by the second node 2 is set to 0.
And the second node 1 receives the first information and the feedback information sent by the second node 2. Because the time for the second node 1 to receive the feedback information sent by the second node 2 is later, the second node 1 may determine the time slot occupied by itself through the feedback information sent by the second node 2 when the first node and the second node 2 do not occupy the next time slot.
And if the first node and the second node 2 do not occupy the next time slot and the feedback information indicates that the second node 1bit occupies the first bit of the time slot occupation sequence, the second node 1 occupies the next time slot. In this case, if the second node 1 needs to transmit data, the data may be transmitted through a slot that may be occupied by itself, and if the second node 1 does not need to transmit data, the silent state may be maintained.
(4) In the time slot occupation sequence indicated by the feedback information, the second node 2 is located one bit behind the second node 1, and in this case, the second node 2 monitors the data transmission condition of the second node 1.
If the second node 2 monitors that the second node 1 sends the data information, the second node 2 waits for the second node 1 to finish sending the data information, and then determines that the second node 1 can occupy the time slot after finishing sending the data information.
If the second node 2 monitors that the second node 1 is silent all the time within a preset time period T1, the second node 2 considers that the second node 1 does not need to send data information, and determines that it can occupy the time slot after the time period T1.
In addition, if the second node 2 fails to analyze the feedback information, the second node 2 keeps the silent state until receiving the information indicating the time slot occupation sequence again, and then determines the time slot that can be occupied by itself through the information received again.
(3) The second node 3 monitors the data transmission of the second node 2.
If the second node 3 monitors that the second node 2 sends the data information, the second node 3 determines that the second node 2 can occupy the time slot after the second node 2 finishes sending the data information after waiting for the second node 2 to finish sending the data information.
If the second node 3 monitors that the second node 2 is silent all the time within a preset time period T2, the second node 3 determines that the second node 2 does not need to send data information, and determines that the second node itself can occupy the time slot after the time period T2.
In addition, if the second node 3 fails to analyze the feedback information, the second node 3 keeps the silent state until receiving the information indicating the time slot occupation sequence again, and then determines the time slot that can be occupied by itself through the information received again.
Further, if the second node 3 is indicated as the last second node indicated by the time slot occupation sequence in the information indicating the time slot occupation sequence received by the second node 3 last time, the second node 3 monitors that each node in the PLC network is in a silent state in a third time period after receiving the first information, or a node (i.e., the second node 2) arranged at a previous position of the second node 3 in the time slot occupation sequence completes sending of the data information, or after the second node 3 completes sending of the data information, the second node 3 may further generate and send the second information.
The second information includes second indication information, where the second indication information is used to indicate a time slot occupation sequence of other nodes in the PLC network, and is also used to indicate whether the second node occupies a next time slot.
In addition, after receiving the second information, other nodes (i.e., the first node, the second node 1, and the second node 2) in the PLC network may determine a time slot that may be occupied by the other nodes according to the second information.
The second information may be a Final PHY frame. Or, if the second node 3 needs to transmit data information, the second information may also include the data information that the second node 3 needs to transmit, in this case, the second information may also be an MSG PHY frame.
Referring to the schematic diagram shown in fig. 8, the second information sent by the second node 3 may include a "willed flag" field, and indicate whether it needs to occupy the next timeslot through the field. In addition, the second information may further include a plurality of sequentially arranged "next send ID" fields, and the slot occupation order determined by the second node 3 is indicated by the plurality of sequentially arranged "next send ID" fields.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Corresponding to the above PLC method, an embodiment of the present application further provides a PLC apparatus for power line communication, where the apparatus is applied to a PLC network, and the PLC network includes the first node and at least one other node. Referring to the schematic structural diagram shown in fig. 9, the apparatus includes: a processing unit 110 and a transceiver unit 120.
The processing unit 110 is configured to generate first information, where the first information includes first indication information, the first indication information is used to indicate a time slot occupation sequence of the nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot.
The transceiving unit 120 is configured to transmit the first information.
In the solution provided in the embodiment of the present application, the first information may be information in various forms. In one possible implementation, the first information further includes data information.
In this case, the transceiver unit 120 is further configured to receive feedback information sent by the second node. The feedback information includes second indication information and third indication information, the second indication information is used for indicating whether the second node sending the feedback information correctly receives the data information, and the third indication information is used for indicating whether the second node sending the feedback information occupies the next time slot. In the solution provided in the embodiment of the present application, the other nodes include the second node.
Further, the third indication information is also used to indicate a time slot occupation sequence of other nodes except the second node that sends the feedback information.
Illustratively, the first information is a data physical layer MSG PHY frame, and the MSG PHY frame includes a first frame header, and the first frame header includes the first indication information;
the feedback information is an acknowledgement physical layer (ACK) PHY frame, the ACK PHY frame comprises a second frame header, and the second frame header comprises the third indication information.
Or, in another possible implementation manner, the first information further includes fourth indication information, where the fourth indication information is used to indicate whether the first node correctly receives a last piece of received information.
Illustratively, the first information is an acknowledgement physical layer ACK PHY frame, and the ACK PHY frame includes a second frame header, and the second frame header includes the fourth indication information.
Or, in another possible implementation manner, the first information is a bottom-supported physical layer Final PHY frame, where the Final PHY frame includes a third frame header, and the third frame header includes the first indication information.
In addition, in the solution provided in this embodiment of the application, in a first time period after the first indication information is sent, if all the other nodes are in the silent state, the transceiver unit is further configured to send the first information again.
In a possible implementation, the slot occupation order is indicated by a difference between node identities, the node identities comprising an identity of the first node and identities of the other nodes.
Correspondingly, corresponding to the above PLC method, an embodiment of the present application further provides a PLC device for power line communication, where the device is applied to a PLC network, where the PLC network includes at least two nodes, and the at least two nodes include a first node and a second node. Referring to the schematic structural diagram shown in fig. 10, the apparatus includes: a processing unit 210 and a transceiver unit 220.
The transceiver unit 220 is configured to receive the first information. The first information includes first indication information, the first indication information is used for indicating the time slot occupation sequence of other nodes except the first node, and the first indication information is also used for indicating whether the first node occupies the next time slot.
If the second node is arranged at the head of the time slot occupying sequence indicated by the first indication information, and the first indication information indicates that the first node does not occupy the next time slot, the processing unit 210 is configured to determine that the second node occupies the next time slot.
Further, in the solution provided in the embodiment of the present application, the at least two nodes further include a third node. In this case, if the second node is arranged at the second position of the time slot occupation sequence, the third node is arranged at the head of the time slot occupation sequence, and the first indication information indicates that the first node does not occupy the next time slot, the processing unit 210 is further configured to determine that the second node occupies the time slot after the third node completes data information transmission, or the processing unit 210 is further configured to determine that the second node occupies the time slot after the preset time length after the third node waits for a preset time length of silence.
Further, in the solution provided in the embodiment of the present application, the at least two nodes further include a fourth node, and the fourth node further sends feedback information.
If the second node is arranged at the head of the time slot occupying sequence indicated by the first indication information, and the first indication information indicates that the first node does not occupy the next time slot, and the feedback information sent by the fourth node indicates that the fourth node occupies the next time slot, the processing unit 210 is further configured to determine that the second node keeps a silent state in the next time slot.
Further, in the solution provided in this embodiment of the application, the processing unit 210 is further configured to determine that the second node maintains a silent state after the second node fails to resolve the first indication information.
The first information may include a variety of forms. In one possible form, the first information further includes data information, and the second node is a receiving node of the data information included in the first information. In this case, after receiving the first indication information, the transceiver unit 220 is further configured to send feedback information through a first channel, where the first channel is different from a second channel, and the second channel is a channel occupied when the second node sends information through the time slot indicated by the time slot occupation sequence.
The feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node sending the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node sending the feedback information occupies a next time slot.
In addition, if the second node is the last second node indicated by the time slot occupation sequence, in the scheme provided in this embodiment of the application, if each node in the PLC network is in a silent state in a third time period after receiving the first indication information, or after the fifth node completes sending the data information, or after the second node completes sending the data information, the processing unit 210 is further configured to generate the second information. Wherein the fifth node is a node that is one bit before the second node in the slot occupying order.
In this case, the transceiving unit 220 is further configured to transmit the second information.
The second information includes second indication information, where the second indication information is used to indicate a time slot occupation sequence of other nodes in the PLC network, and is also used to indicate whether the second node occupies a next time slot.
Correspondingly, the embodiment of the application also provides a terminal device. Referring to the schematic structural diagram shown in fig. 11, the terminal apparatus includes: a processor 1101 and a memory, wherein the memory stores a computer program, and the processor implements all or part of the steps in the embodiments corresponding to fig. 3, fig. 4 and fig. 6 when executing the computer program stored in the memory.
Further, the terminal device may further include: a transceiver 1102 and a bus 1103 that includes a random access memory 1104 and a read only memory 1105.
The processor is coupled to the transceiver, the random access memory and the read only memory through the bus respectively. When the terminal device needs to be operated, the device is guided to enter a normal operation state by starting a basic input and output system solidified in a read only memory or a bootloader guiding system in an embedded system. After the device enters a normal operation state, an application program and an operating system are operated in the random access memory, so that the terminal device executes all or part of the steps in the embodiments corresponding to fig. 3, 4 and 6.
The apparatus according to the embodiment of the present invention may correspond to the PLC apparatus in the embodiment corresponding to fig. 9, and a processor in the apparatus may implement the functions of the apparatus and/or various steps and methods implemented in the embodiment corresponding to fig. 9, which are not described herein again for brevity.
Correspondingly, the embodiment of the application also provides a terminal device. The terminal device includes: a processor and a memory, wherein the memory stores a computer program, and the processor implements all or part of the steps in the embodiment corresponding to fig. 7 when executing the computer program stored in the memory.
Further, the terminal device may further include: a transceiver and a bus, the memory including random access memory and read only memory.
The processor is coupled to the transceiver, the random access memory and the read only memory through the bus respectively. When the terminal device needs to be operated, the device is guided to enter a normal operation state by starting a basic input and output system solidified in a read only memory or a bootloader guiding system in an embedded system. After the device enters a normal operation state, an application program and an operating system are operated in the random access memory, so that the terminal device executes all or part of the steps in the embodiment corresponding to fig. 7.
The apparatus according to the embodiment of the present invention may correspond to the PLC apparatus in the embodiment corresponding to fig. 10, and a processor in the apparatus may implement the functions of the apparatus and/or various steps and methods implemented in the embodiment corresponding to fig. 10, which are not described herein again for brevity.
In particular implementations, embodiments of the present application also provide a computer-readable storage medium, which includes instructions. Wherein a computer readable medium disposed in any apparatus, which when executed on a computer, may perform all or a portion of the steps of the embodiments corresponding to fig. 3, 4, and 6. The storage medium of the computer readable medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
In addition, the embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium comprises instructions. Wherein a computer readable medium disposed in any apparatus, which when executed on a computer, may perform all or a portion of the steps of the corresponding embodiment of fig. 7. The storage medium of the computer readable medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Another embodiment of the present application also provides a computer program product containing instructions, which when run on an electronic device, enables the electronic device to implement all or part of the steps in the corresponding embodiments including fig. 3, fig. 4, and fig. 6.
Another embodiment of the present application also provides a computer program product containing instructions, which when run on an electronic device, enables the electronic device to implement all or part of the steps in the corresponding embodiment of fig. 7.
Correspondingly, this application embodiment still discloses a power line communication PLC system, the PLC system includes:
the PLC device in the embodiment corresponding to fig. 9, and a processor and the like in the PLC device may implement the functions of the device and/or various steps and methods implemented in the embodiment corresponding to fig. 9, which are not described herein again for brevity;
the PLC device in the embodiment corresponding to fig. 10, and a processor in the PLC device may implement the functions of the device and/or various steps and methods implemented in the embodiment corresponding to fig. 10, which are not described herein again for brevity.
The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be located in a UE. In the alternative, the processor and the storage medium may reside in different components in the UE.
It should be understood that, in the various embodiments of the present application, the size of the serial number of each process does not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The same and similar parts among the various embodiments of the present specification may be referred to, and each embodiment is described with emphasis on differences from the other embodiments. In particular, as to the apparatus and system embodiments, since they are substantially similar to the method embodiments, the description is relatively simple and reference may be made to the description of the method embodiments in relevant places.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.

Claims (22)

1. A power line communication, PLC, method for application to a PLC network comprising a first node and at least one other node, the method comprising:
the first node generates first information, wherein the first information comprises first indication information, the first indication information is used for indicating the time slot occupation sequence of other nodes except the first node, and the first indication information is also used for indicating whether the first node occupies the next time slot;
the first node sends the first information.
2. The method of claim 1, wherein the first information further comprises data information, wherein the other nodes comprise second nodes, and wherein the method further comprises:
the first node receives feedback information sent by a second node, wherein the feedback information comprises second indication information and third indication information, the second indication information is used for indicating whether the second node sending the feedback information correctly receives the data information, and the third indication information is used for indicating whether the second node sending the feedback information occupies a next time slot.
3. The method according to claim 2, wherein the third indication information is further used for indicating an occupation sequence of timeslots of other nodes than the second node which transmits the feedback information.
4. The method according to claim 2 or 3, wherein the first information is a data physical layer (MSG) PHY frame, the MSG PHY frame comprising a first frame header, the first frame header comprising the first indication information;
the feedback information is an acknowledgement physical layer (ACK) PHY frame, the ACK PHY frame comprises a second frame header, and the second frame header comprises the third indication information.
5. The method of claim 1, wherein the first information further comprises fourth indication information, and wherein the fourth indication information is used to indicate whether the first node correctly receives a last piece of received information.
6. The method of claim 5, wherein the first information is an acknowledgement physical layer (ACK) PHY frame, wherein the ACK PHY frame comprises a second frame header, and wherein the second frame header comprises the fourth indication information.
7. The method of claim 1, wherein the first information is a bottom physical layer (Final PHY) frame, the Final PHY frame comprising a third frame header, the third frame header comprising the first indication information.
8. Method according to any of claims 1 to 7, wherein said time slot occupation order is indicated by a difference between node identities, said node identities comprising an identity of said first node and identities of said other nodes.
9. A PLC method for power line communication, the method being applied to a PLC network including at least two nodes including a first node and a second node, the method comprising:
the second node receives first information, wherein the first information comprises first indication information, the first indication information is used for indicating the time slot occupation sequence of other nodes except the first node, and the first indication information is also used for indicating whether the first node occupies the next time slot;
and if the second node is arranged at the head of the time slot occupation sequence in the time slot occupation sequence indicated by the first indication information and the first node does not occupy the next time slot indicated by the first indication information, the second node determines to occupy the next time slot.
10. The method of claim 9, wherein the at least two nodes further comprise a third node, the method further comprising:
if the second node is arranged at the second position of the time slot occupation sequence, the third node is arranged at the first position of the time slot occupation sequence, and the first indication information indicates that the first node does not occupy the next time slot, the second node occupies the time slot after the third node completes data information transmission after waiting for the third node to complete data information transmission, or the second node occupies the time slot after the preset time length after waiting for the third node to silence for the preset time length.
11. The method according to claim 9 or 10, wherein the at least two nodes further comprise a fourth node, the fourth node further sending feedback information, the method further comprising:
if the time slot occupation sequence indicated by the first indication information is in the first position of the time slot occupation sequence, the second node is arranged at the head of the time slot occupation sequence, the first indication information indicates that the first node does not occupy the next time slot, and when the feedback information sent by the fourth node indicates that the fourth node occupies the next time slot, the second node keeps a silent state in the next time slot.
12. The method of any of claims 9 to 11, wherein the first information further comprises data information, the method further comprising:
the second node is a receiving node of the data information included in the first information, after receiving the first indication information, the second node sends feedback information through a first channel, the first channel is different from a second channel, and the second channel is a channel occupied when the second node sends the data information through the time slot indicated by the time slot occupation sequence;
the feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node sending the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node sending the feedback information occupies a next time slot.
13. The method according to any of claims 9 to 12, wherein if the second node is the last second node indicated by the slot occupying order, the method further comprises:
if each node in the PLC network is in a silent state within a third time period after receiving the first indication information, or after a fifth node completes sending the data information, or after the second node completes sending the data information, the second node generates and sends the second information, wherein the fifth node is a node that is arranged one bit before the second node in the time slot occupation sequence;
the second information includes second indication information, where the second indication information is used to indicate a time slot occupation sequence of other nodes in the PLC network, and is also used to indicate whether the second node occupies a next time slot.
14. A power line communication PLC apparatus, applied to a PLC network including a first node and at least one other node, the apparatus comprising:
a processing unit, configured to generate first information, where the first information includes first indication information, where the first indication information is used to indicate a time slot occupation sequence of the other nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot;
and the transceiving unit is used for transmitting the first information.
15. The apparatus of claim 14, wherein the other node comprises a second node, and wherein the first information further comprises data information;
the transceiver unit is further configured to receive feedback information sent by a second node, where the feedback information includes second indication information and third indication information, the second indication information is used to indicate whether the second node that sends the feedback information correctly receives the data information, and the third indication information is used to indicate whether the second node that sends the feedback information occupies a next time slot.
16. The apparatus of claim 14, wherein the first information further comprises a fourth indication information, and wherein the fourth indication information is used to indicate whether the first node correctly received the last piece of received information.
17. A power line communication PLC apparatus applied to a PLC network including at least two nodes including a first node and a second node, the apparatus comprising: a transceiving unit and a processing unit;
the transceiver unit is configured to receive first information, where the first information includes first indication information, the first indication information is used to indicate a time slot occupation sequence of the other nodes except the first node, and the first indication information is also used to indicate whether the first node occupies a next time slot;
if the second node is arranged at the head of the time slot occupation sequence indicated by the first indication information, and the first indication information indicates that the first node does not occupy the next time slot, the processing unit is configured to determine that the second node occupies the next time slot.
18. The apparatus of claim 17, wherein the at least two nodes further comprise a third node,
if the second node is arranged at the second position of the time slot occupation sequence, the third node is arranged at the first position of the time slot occupation sequence, and the first indication information indicates that the first node does not occupy the next time slot, the processing unit is further configured to determine that the second node occupies the time slot after the third node completes data information transmission, or the processing unit is further configured to determine that the second node occupies the time slot after the preset time length after the third node waits for a preset time length for silence.
19. The apparatus according to claim 17 or 18, wherein the at least two nodes further comprise a fourth node, the fourth node further sending feedback information,
if the second node is arranged at the head of the time slot occupation sequence indicated by the first indication information, and the first indication information indicates that the first node does not occupy the next time slot, and the feedback information sent by the fourth node indicates that the fourth node occupies the next time slot, the processing unit is further configured to determine that the second node maintains a silent state in the next time slot.
20. A terminal device for use in a PLC network, the terminal device comprising a processor and a memory, the memory having a computer program stored therein;
the processor executes a computer program stored in the memory to cause the terminal device to perform the method of any one of claims 1 to 13.
21. A readable storage medium, wherein the readable storage medium is configured to store instructions;
when executed, implement the method of any one of claims 1 to 13.
22. A power line communication PLC system, comprising:
the PLC device of any one of claims 14 to 19.
CN202010608029.3A 2020-06-29 2020-06-29 Power line communication PLC method and device Active CN113938161B (en)

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