WO2016169265A1 - 一种多个电力线网络之间协调方法及装置 - Google Patents

一种多个电力线网络之间协调方法及装置 Download PDF

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Publication number
WO2016169265A1
WO2016169265A1 PCT/CN2015/095065 CN2015095065W WO2016169265A1 WO 2016169265 A1 WO2016169265 A1 WO 2016169265A1 CN 2015095065 W CN2015095065 W CN 2015095065W WO 2016169265 A1 WO2016169265 A1 WO 2016169265A1
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Prior art keywords
time slot
power line
network
line network
signaling
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PCT/CN2015/095065
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English (en)
French (fr)
Inventor
张国宾
叶步财
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华为技术有限公司
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Publication of WO2016169265A1 publication Critical patent/WO2016169265A1/zh
Priority to US15/789,306 priority Critical patent/US9985689B2/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
    • H04B3/544—Setting up communications; Call and signalling arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/08—Synchronising of networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling
    • H04L12/4035—Bus networks with centralised control, e.g. polling in which slots of a TDMA packet structure are assigned based on a contention resolution carried out at a master unit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2803—Home automation networks
    • H04L2012/284—Home automation networks characterised by the type of medium used
    • H04L2012/2843—Mains power line

Definitions

  • the present invention relates to the field of communication processing, and in particular, to a method and apparatus for coordinating between multiple power line networks.
  • the existing power line network belongs to a shared network, and the shared medium is a wave transmitted on the power line. Because power line communication is a bus type, it cannot be like an Ethernet line, so that unrelated sites can be isolated. Therefore, the radio waves transmitted on the power line are received by all stations on the power line without considering the attenuation.
  • the Central Coordinator is a concentrator on the transformer, the other stations are electricity meters, and the CCO and the electricity meter are connected by a power line.
  • a plurality of power line networks represent a scenario in which a plurality of power line networks formed by three transformers coexist.
  • three transformers are connected to the same bus, and the three power line networks to which the three transformers belong are adjacent to each other.
  • the total bandwidth used for the transmission channel is divided into several sub-bands, each of which can be used as an independent transmission channel, and each network corresponds to one sub-band.
  • each network corresponds to one sub-band.
  • the scheme splits one frequency band into multiple sub-bands, which leads to a decrease in bandwidth utilization.
  • each time slot can only be used by one network, and multiple networks alternately use different time slots (for example, in the first time slot allocation period, network 1 uses time slot 1 and network 2 corresponds to The time slot 2 is used, and then the network 3 uses the time slot 3; the subsequent periodic time slot allocation principle is the same as the time slot non-matching period), as shown in FIG. 3 .
  • the disadvantage of this scheme is that in the power line network, multiple networks generally have interworking at the root node. Most of the sub-nodes in the network can only communicate with the nodes in the network. Since each network monopolizes one time slot, the network bandwidth is utilized. The rate has doubled and the business delay has increased, which cannot meet the existing application requirements.
  • the present invention provides a method and apparatus for coordinating between multiple power line networks.
  • the method and apparatus provided by the present invention solve the problem of signal interference and attenuation in an existing shared network.
  • a method for coordinating between multiple power line networks including a first power line network and a second power line network, the first power line network and the second power line network being adjacent, in one slot cycle
  • the first power line network and the second power line network respectively correspond to one network time slot, wherein each network time slot includes one signaling time slot and one data time slot, and the signaling time slot is used for carrying network signaling.
  • the data time slot is used to carry data services, and the method includes:
  • the central coordinator of the first power line network acquires signaling time slot information of the second power line network
  • a non-contention time slot is determined according to the preset backoff rule as the signaling time slot of the first power line network.
  • the obtaining, by the central coordinator of the first power line network, the signaling time slot information of the second power line network includes:
  • the central coordinator of the first power line network receives a multi-network coordination frame, and obtains signaling time slot information of the second power line network from the multi-network coordination frame.
  • the network coordination frame is a short frame structure.
  • the determining, according to a preset backoff rule, a non-contention time slot includes:
  • the preset signaling time slot is used as a signaling time slot of the first power line network.
  • the preset backoff rule includes:
  • the signaling slot that has not started is backed off the signaling slot that has started; or,
  • a network backoff that cannot receive a message from a neighbor network can receive a message of a message of a neighbor network
  • a network with a large network identification number retreats a network with a small network identification number.
  • the central coordinator of the first power line network is configured according to the signaling
  • the time slot information determines whether a predetermined signaling time slot of the first power line network conflicts with a signaling time slot of the second power line network includes:
  • the duration is used to indicate the length of the time slot that the second power line network needs to occupy;
  • the bandwidth end flag is used to indicate whether the network time slot on the second power line network has ended;
  • the bandwidth end offset is used to indicate a time offset of an end time of a network slot on the second power line network; the bandwidth starts to be offset, and is used to indicate that the next network slot of the second power line network starts Time offset of time.
  • a central coordinator which is disposed on a plurality of power line networks
  • the plurality of power line networks further includes a second power line network
  • the first power line network and the second power line network are adjacent
  • the first power line network and the second power line network respectively correspond to one network in one slot cycle a time slot, wherein each network time slot includes a signaling time slot for carrying network signaling, and a data time slot for carrying data traffic
  • the central coordination includes:
  • An acquiring unit configured to acquire signaling time slot information of the second power line network
  • a time slot determining unit configured to determine, according to the signaling time slot information, whether a predetermined signaling time slot of the first power line network collides with a signaling time slot of the second power line network, if the predetermined signaling time slot and the second If there is a conflict in the signaling time slots of the power line network, a non-contention time slot is determined as the signaling time slot of the first power line network according to a preset backoff rule.
  • the acquiring unit is further configured to receive a multi-network coordination frame, and acquire signaling time slot information of the second power line network from the multi-network coordination frame, where
  • the network coordination frame is a short frame structure.
  • the time slot determining unit is further configured to determine, according to a preset backoff rule, whether the first power line network is Retrieving the second power line network; if yes, selecting a signaling time slot that does not conflict with a signaling time slot of the second power line network as a signaling time slot of the first power line network; otherwise, The preset signaling time slot is used as a signaling time slot of the first power line network.
  • the time slot determining unit is further configured to use the following preset backoff rule Any one of them determines a contention-free time slot as the signaling time slot of the first power line network:
  • the signaling slot that has not started is backed off the signaling slot that has started; or,
  • a network backoff that cannot receive a message from a neighbor network can receive a message of a message of a neighbor network
  • a network with a large network identification number retreats a network with a small network identification number.
  • the time slot determining unit is further configured to use the signaling time slot according to the a duration, a bandwidth end flag, a bandwidth end offset, and a bandwidth start offset carried in the information, determining whether the predetermined signaling time slot collides with a signaling time slot of the second power line network; wherein the duration And indicating a length of a time slot that the second power line network needs to occupy; the end of the bandwidth a location indicating whether a network time slot of the second power line network has ended; the bandwidth end offset is used to indicate a time offset of an end time of a network time slot of the second power line network; The bandwidth begins to shift, and is used to indicate a time offset of the start time of the next network slot of the second power line network.
  • a central coordinator is provided, the central coordinator being disposed in a first power line network of a plurality of power line networks, the plurality of power line networks further including a second power line network, the first power line network and the second power line network And, in a slot cycle, the first power line network and the second power line network respectively correspond to one network time slot, wherein each network time slot includes one signaling time slot and one data time slot, where the signaling time is The slot is used to carry network signaling, the data slot is used to carry data services, and the central coordinator includes a processor and a memory, wherein the processor is configured to perform the following operations by calling program instructions stored in the memory:
  • a processor configured to acquire signaling time slot information of the second power line network; and determine, according to the signaling time slot information, whether a predetermined signaling time slot of the first power line network and a signaling time slot of the second power line network Collision, if the predetermined signaling time slot conflicts with the signaling time slot of the second power line network, determining a contention-free time slot as the signaling time slot of the first power line network according to a preset backoff rule.
  • the central processing unit further includes a receiver, configured to receive a multi-network coordination frame
  • the processor is further configured to acquire signaling time slot information of the second power line network from the multiple network coordination frame, where the network coordination frame is a short frame structure.
  • the processor is further configured to determine, according to a preset backoff rule, whether the first power line network needs to be backed off The second power line network; if yes, selecting a signaling time slot that does not conflict with a signaling time slot of the second power line network as a signaling time slot of the first power line network; otherwise, the preset The signaling time slot serves as a signaling time slot of the first power line network.
  • the processor is further configured to use the following preset backoff rule Any one of determining a non-contention time slot as the signaling time slot of the first power line network:
  • the signaling slot that has not started is backed off the signaling slot that has started; or,
  • a network backoff that cannot receive a message from a neighbor network can receive a message of a message of a neighbor network
  • a network with a large network identification number retreats a network with a small network identification number.
  • the processor is further configured to use, according to the signaling time slot information
  • the carried duration, the bandwidth end flag, the bandwidth end offset, and the bandwidth start offset determine whether the predetermined signaling time slot collides with a signaling time slot of the second power line network; wherein, the duration is used And indicating that the second power line network needs to occupy the occupied time slot length; the bandwidth end flag is used to indicate whether the network time slot on the second power line network has ended; the bandwidth end offset is used for Determining a time offset of an end time of a network slot on the second power line network; the bandwidth starting offset is used to indicate a time offset of a start time of a next network slot of the second power line network.
  • the method provided by the present invention firstly distinguishes a signaling time slot from a data time slot, and determines a signaling time slot corresponding to each network by using a multi-network coordination signaling time slot manner, and can set different network signaling time slots. Orderly staggered, not only ensures that the signaling time slots do not conflict (that is, avoids signal interference and attenuation in the shared network), because after all the network time slots corresponding to each power line network are allocated in one time slot period, other cycles are repeated. Operation, so that the periodicity of signaling can be ensured by using the solution provided by the present invention; in addition, the method provided by the present invention can also improve multi-network bandwidth utilization.
  • FIG. 1 is a schematic diagram of a physical topology of a shared network in the prior art
  • FIG. 3 is a schematic diagram of arrangement of multiple network time slots in a time division scheme in the prior art
  • FIG. 4 is a schematic flowchart of a method for coordinating between multiple power line networks according to Embodiment 1 of the present invention
  • FIG. 5 is a schematic structural diagram of a central coordinator according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a central coordinator according to Embodiment 3 of the present invention.
  • the network signaling belongs to the network control information, it is required to ensure that the network signaling is reliably transmitted on the channel. Therefore, each station (corresponding to one power line network) needs to specify a contention-free time slot for transmission.
  • Network signaling where each station uses a contention-free mode when transmitting network signaling in a specified contention-free time slot. Sites can send data frames in a competitive manner.
  • the method provided by the embodiment of the present invention uses the following manner to plan the time slot resources of the multiple power line networks, including:
  • a plurality of power line networks constitute a multi-network system in a power line environment
  • the time slot resources of the plurality of power line networks are divided into a plurality of network time slots, and each of the network time slots includes one signaling time slot And a data slot.
  • Signaling time slot used to carry network signaling, consisting of one or more channels of Contention Free Period (CFP).
  • the network signaling carries network control information such as time slot information and network parameters corresponding to the network, and the channel non-contention time slot belongs to an exclusive time slot, and the data transmitted in the time slot is highly reliable.
  • Data slot used to carry data services, consisting of one or more contention periods, and is transmitted in carrier Sense Multiple Access (CSMA) contention mode.
  • CSMA carrier Sense Multiple Access
  • the channel contention time slot belongs to the shared time slot and is shared by all stations in the network. The station sends the data frame in a competitive manner.
  • the main mechanism for performing slot coordination between multiple networks is: the signaling slots of any two power line networks do not overlap, and the data slots of a certain power line network can be signaled with other networks. Gap or data time slots overlap. The data in the signaling time slot is sent with a higher priority than the data in the data time slot.
  • the power line network node retreats and waits. The signaling is over. Different power line networks, need The occupied signaling slots are different, so it means that the bandwidth is also different.
  • the signaling time slots of different power line networks can be staggered in an orderly manner, which not only ensures that the signaling time slots do not conflict, but also ensures the periodicity of signaling transmission.
  • the present invention provides a plurality of network coordination methods in a power line environment, where multiple power line networks include a first power line network and a second power line network (the second power line network A plurality of) may be included, the first power line network and the second power line network being adjacent (ie, the first power line network and the second power line network are connected to the same bus), in one slot cycle (in this embodiment, the plurality Each of the power line networks is assigned a network time slot to form a time slot period.
  • the first power line network and the second power line network respectively correspond to one network time slot, wherein each network time slot includes one a signaling time slot and a data time slot, the signaling time slot is used to carry network signaling, and the data time slot is used to carry data services, and the method specifically includes:
  • Step 401 The central coordinator of the first power line network acquires signaling time slot information of the second power line network.
  • the first power line network in order to coordinate a plurality of power line networks, when determining the signaling time slot of the first power line network, the first power line network needs to determine whether the signaling time slot corresponding to the adjacent power line network conflicts with itself, thereby selecting not to be neighbors.
  • the signaling time slot in which the signaling time slots of the network overlap.
  • the plurality of power line networks transmit their own time slot information to the adjacent power line network in a certain manner, so that the adjacent power line network can determine the time slots of each adjacent power line network according to the received time slot information, so the first power line network
  • the specific implementation manner of the central coordinator acquiring the signaling time slot information of the second power line network may be:
  • the central coordinator of the first power line network receives the multi-network coordination frame, and obtains signaling time slot information of the second power line network from the multi-network coordination frame.
  • the network coordination frame can adopt a short frame structure.
  • the short frame structure adopted by the embodiment of the present invention may be a short frame structure of 16 bytes in length. Because the short frame transmission success rate is high, the short frame structure can improve the coordination effect; in addition, the short frame transmission takes a short time, which can reduce the bandwidth occupation of the network maintenance message, leave more bandwidth for the service, and improve the effective utilization of the bandwidth resource. .
  • Step 402 The central coordinator of the first power line network determines, according to the signaling time slot information, whether a predetermined signaling time slot of the first power line network collides with a signaling time slot of the second power line network;
  • the two network signaling time slots overlap in time, and the signaling time slots are considered to be in conflict.
  • a signaling time slot ie, a predetermined signaling time slot
  • Step 403 If the predetermined signaling time slot conflicts with the signaling time slot of the second power line network, determine a non-contention time slot as the signaling time slot of the first power line network according to the preset backoff rule.
  • a non-contention time slot is determined according to a preset backoff rule (in order to ensure the reliability of the signaling time slot, the first power line network is coordinated after the adjacent power line network needs to ensure that the determined time slot is exclusive)
  • the slot as the signaling slot of the first power line network includes:
  • the preset signaling time slot is used as a signaling time slot of the first power line network; and the adjustment message is sent to the second power line network, so that the second power line network reselects a time slot according to the adjustment message as its own Signaling slot.
  • the backoff rule may be determined by using multiple methods. As long as the backoff rule can ensure that the corresponding signaling time slots of the two networks do not overlap, the following provides several optional implementation manners, including:
  • the signaling slot that has not started is backed off the signaling slot that has started;
  • a network that cannot receive a message of a neighbor network can receive a network of messages of a neighbor network
  • the two networks may be in conflict with each other to determine the network that needs to be retired.
  • the network that needs to be retired may be determined after combining multiple backoff modes.
  • the multi-network coordination frame of the short frame structure may be used to exchange the signaling time slots, and the specific multi-network coordination frame may be used. Is the structure shown in Table 1:
  • the delimiter type is used to indicate the frame type. When the frame is received, it can be confirmed by the delimiter whether it is a multi-network coordination frame.
  • the delimiter value of the multi-network coordination frame in this embodiment may be 0b011.
  • An access indication indicating a link layer protocol data unit (MAC Protocol Data Unit, MPDU) The type of network in which the transmission is sent; where the access indication is 1 bit in length. If the value of the access indication is 0b1, it means that it is transmitted in the broadband carrier communication access network; if the value of the access indication is 0b0, it means that it is transmitted in the homeplug nv network.
  • MPDU Link Layer Protocol Data Unit
  • Short network identifier used to distinguish different broadband carrier communication networks; effective values are 1-15.
  • Each broadband carrier communication network must have a unique Short Network Identifier (SNID).
  • the short network identifier high byte is used to indicate the short network identifier of the broadband carrier communication network that the station can receive; the short network identifier high byte is a 9-bit field indicating a short network of the broadband carrier communication network that the station can receive.
  • Each bit corresponds to a short network identifier, bit 0 represents a broadband carrier communication network with a short network identifier of 7, bit 1 represents a network with a short network identifier of 8, and the rest of the analogy represents a short network identifier range of 7-15.
  • the bit value is 0, indicating that the message of the wideband carrier communication network has not been received; the bit value is 1, indicating that the message of the wideband carrier communication network can be received.
  • the duration is used to indicate the length of the time slot that the network needs to apply for.
  • the duration is a 14-bit field indicating the length of the time slot that the network needs to apply for. Unit: 40ms.
  • the coordination flag is used to indicate whether the current MPDU is an inter-network coordination frame; the coordination flag is a 1-bit field. In the inter-network coordination frame, the value of this bit is 1.
  • the end of bandwidth flag is used to indicate whether the bandwidth period of the network has ended.
  • the end of the bandwidth flag is a 1-bit field. The value of the bit is 1, indicating that the previous bandwidth period has ended. If the value is 0, the value is The bandwidth period has not ended.
  • the short network identifier low byte is used to indicate the short network identifier of the broadband carrier communication network that the station can receive; the short network identifier low byte is a 6-bit field, each bit corresponds to one SNID, and bit 0 represents the short network identifier.
  • bit 1 represents a network with a short network identifier of 2
  • the rest of the analogy represents a short network identifier range of 1-6.
  • the value of the bit is 0, indicating that the message of the wideband carrier communication network has not been received; the value of the bit is 1, indicating that the message of the wideband carrier communication network can be received.
  • the offset time represents the time offset from the end time of the last bandwidth time slot to the current time.
  • the offset time indicates the current time, and the current bandwidth time slot end time. Time offset.
  • the bandwidth begins to shift, and the time offset of the next bandwidth slot start time, unit: 40ms.
  • the offset time represents a time offset from the current time to the start time of the next bandwidth slot.
  • the offset time has a value of 0 when the next bandwidth slot has begun.
  • each network receives multiple network coordination frames of multiple neighbor networks, and in order to uniformly manage time slot allocation of multiple networks, based on the foregoing Table 1 Parameters provided by the multi-network coordination frame
  • the current network can manage the information of multiple neighbor networks in the form of a table.
  • the information of the multi-network coordination frame can be updated to the adjacent network information table, as shown in Table 2:
  • the central coordinator of the first power line network according to the signaling time slot information Determining whether a predetermined signaling time slot of the first power line network collides with a signaling time slot of the second power line network and the central coordinator selects a signaling time slot that does not conflict with a signaling time slot of the second power line network as the first
  • the signaling time slot of the power line network specifically includes:
  • the central coordinator of the first power line network may determine the duration occupied by the second time slot corresponding to the second power line network according to the time slot duration corresponding to the second power line network, and then determine the last time according to the bandwidth flag bit. Whether the network time slot has ended; if it is finished, the offset time corresponding to the offset is used to determine the time offset from the end time of the last bandwidth time slot to the current time; To determine whether the next bandwidth time slot starts, if not, the time offset from the current time to the start time of the next bandwidth time slot may be determined according to the offset time.
  • the duration, the end of bandwidth flag, the end of bandwidth offset, and the start of the bandwidth give the time slots that each power line network occupies in two slot cycles, it can be continued based on the duration of the collision.
  • the time, bandwidth end flag, bandwidth end offset, and bandwidth start offset determine if the time slot conflicts.
  • the contention-free time slot when selected as the signaling time slot of the first power line network, it may also be occupied by each power line network determined according to the duration, the bandwidth end flag bit, the bandwidth end offset, and the bandwidth start offset. Time to avoid overlapping of signaling time slots to avoid collisions.
  • the embodiment provides a central coordinator 500, which is disposed in a first power line network of a plurality of power line networks, where the plurality of power line networks further includes a second power line network, and the first power line network Adjacent to the second power line network, and the first power line network and the second power line network respectively correspond to one network time slot in one slot cycle, wherein each network time slot includes one signaling time slot and one data time slot
  • the signaling time slot is used to carry network signaling
  • the data time slot is used to carry data services
  • the central coordinator includes:
  • An obtaining unit 501 configured to acquire signaling time slot information of the second power line network
  • the first power line network in order to coordinate a plurality of power line networks, when determining the signaling time slot of the first power line network, the first power line network needs to determine whether the signaling time slot corresponding to the adjacent power line network conflicts with itself, thereby selecting not to be neighbors.
  • the signaling time slot in which the signaling time slots of the network overlap.
  • the plurality of power line networks transmit their own time slot information to the adjacent power line network in a certain manner, so that the adjacent power line network can determine the time slots of each adjacent power line network according to the received time slot information, so:
  • the acquiring unit 501 is further configured to receive a multi-network coordination frame, and obtain signaling slot information of the second power line network from the multi-network coordination frame, where the network coordination frame is a short frame structure.
  • a time slot determining unit 502 configured to determine, according to the signaling time slot information, whether a predetermined signaling time slot of the first power line network collides with a signaling time slot of the second power line network, if the predetermined signaling time slot and the If there is a conflict between the signaling time slots of the two power line networks, a non-contention time slot is determined as the signaling time slot of the first power line network according to the preset backoff rule.
  • a contention-free time slot is determined according to a preset backoff rule (in order to ensure the reliability of the signaling time slot, after the first power line network is coordinated by the adjacent power line network, it is necessary to ensure that the determined time slot is
  • the method includes:
  • the time slot determining unit 502 is further configured to determine, according to a preset backoff rule, whether the first power line network needs to back off the second power line network; if yes, select one that does not conflict with a signaling time slot of the second power line network.
  • the signaling time slot is used as a signaling time slot of the first power line network; otherwise, the preset signaling time slot is used as a signaling time slot of the first power line network.
  • the backoff rule specifically used by the time slot determining unit 502 includes multiple types. In this embodiment, several implementable manners are provided, where:
  • the time slot determining unit 502 can determine a non-contention time slot as a signaling time slot of the first power line network by using any one of the following preset backoff rules:
  • the signaling slot that has not started is backed off the signaling slot that has started; or,
  • a network backoff that cannot receive a message from a neighbor network can receive a message of a message of a neighbor network
  • a network with a large network identification number retreats a network with a small network identification number.
  • the central coordinator determines whether the predetermined signaling time slot of the first power line network and the signaling time slot of the second power line network are based on the signaling time slot information.
  • the conflicting and the signaling time slot that the central coordinator selects not to collide with the signaling time slot of the second power line network as the signaling time slot of the first power line network includes:
  • the time slot determining unit 502 is further configured to determine, according to the duration, the bandwidth end flag, the bandwidth end offset, and the bandwidth start offset carried in the signaling time slot information, whether the predetermined signaling time slot is different from the first a signaling time slot conflict of the two power line networks; wherein the duration is used to indicate a length of a time slot that the second power line network needs to apply for; and the bandwidth end flag is used to indicate the second power line network Whether the last network time slot has ended; the bandwidth end offset is used to indicate a time offset of the end time of the network time slot on the second power line network; the bandwidth starts to be offset, and is used to indicate the The time offset of the start time of the next network time slot of the second power line network.
  • an embodiment of the present invention provides a central coordinator 600, which is disposed in a first power line network of a plurality of power line networks, where the plurality of power line networks further includes a second power line network, and the first power line
  • the network is adjacent to the second power line network, and the first power line network and the second power line network respectively correspond to one network time slot in one slot cycle, wherein each network time slot includes one signaling time slot and one data time
  • the signaling time slot is used to carry network signaling
  • the data time slot is used to carry data services
  • the central coordinator includes a processor 601 and a memory 602, wherein the processor 601 stores the memory stored in the memory 602.
  • Program instructions are used to perform the following operations:
  • the processor 601 is configured to acquire signaling time slot information of the second power line network, and determine, according to the signaling time slot information, whether the predetermined signaling time slot of the first power line network is signaling with the second power line network. If there is a conflict between the predetermined signaling time slot and the signaling time slot of the second power line network, a non-contention time slot is determined as the signaling time slot of the first power line network according to the preset backoff rule.
  • the central processor further includes a receiver 603 for receiving a multi-network coordination frame
  • the processor 601 is further configured to acquire signaling time slot information of the second power line network from the multiple network coordination frame, where the network coordination frame is a short frame structure.
  • a contention-free time slot is determined according to a preset backoff rule (in order to ensure the reliability of the signaling time slot, after the first power line network is coordinated by the adjacent power line network, it is necessary to ensure that the determined time slot is
  • the method includes:
  • the processor 601 is further configured to determine, according to a preset backoff rule, whether the first power line network needs to back off the second power line network; if yes, select a message that does not conflict with a signaling time slot of the second power line network.
  • the time slot is used as a signaling time slot of the first power line network; otherwise, the preset signaling time slot is used as a signaling time slot of the first power line network.
  • the main function of the backoff rule is to determine who of the two power line networks that are in conflict to perform backoff (that is, to determine the priority of the two power line networks in some manner), so the specifically adopted backoff rules include multiple
  • the specifically adopted backoff rules include multiple
  • the processor 601 is further configured to determine a contention-free time slot as a signaling time slot of the first power line network by using any one of the following preset backoff rules:
  • the signaling slot that has not started is backed off the signaling slot that has started; or,
  • Network backoff that cannot receive messages from neighbor networks can receive messages from neighbor network messages Network;
  • a network with a large network identification number retreats a network with a small network identification number.
  • the central coordinator determines whether the predetermined signaling time slot of the first power line network and the signaling time slot of the second power line network are based on the signaling time slot information.
  • the conflicting and the signaling time slot in which the central coordinator selects not to collide with the signaling time slot of the second power line network as the signaling time slot of the first power line network may be:
  • the processor 601 is further configured to determine, according to the duration, the bandwidth end flag, the bandwidth end offset, and the bandwidth start offset carried in the signaling time slot information, whether the predetermined signaling time slot is related to the second power line network. a signaling time slot conflict; wherein the duration is used to indicate a length of a time slot that the second power line network needs to apply for; the bandwidth end flag is used to indicate a network on the second power line network Whether the time slot has ended; the bandwidth end offset is used to indicate a time offset of the end time of the network time slot on the second power line network; the bandwidth starts to shift to represent the second power line network The time offset of the start of the next network time slot.
  • the method provided by the present invention firstly distinguishes a signaling time slot from a data time slot, and determines a signaling time slot corresponding to each network by using a multi-network coordination signaling time slot manner, and can set different network signaling time slots. Orderly staggered as much as possible to ensure that the signaling time slots do not conflict (ie, avoid signal interference and attenuation in the shared network), and also ensure the periodicity of signaling transmission; in addition, the method provided by the present invention can also improve multiple networks. Bandwidth utilization.
  • each network uses short frames to transmit messages when coordinating signaling time slots. Because the short frame transmission success rate is high, the short frame structure can improve the coordination effect. In addition, the short frame transmission takes a short time, which can reduce network maintenance message pairs. The bandwidth is occupied, leaving more bandwidth for the service and improving the effective utilization of bandwidth resources.

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Abstract

本发明公开了一种多个电力线网络之间协调方法及装置，该方法包括：多个电力线网络中第一电力线网络的中央协调器获取第二电力线网络的信令时隙信息；根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。本发明公开的方法和装置可以将不同的网络的信令时隙尽量的有序的错开，既保证信令时隙的不冲突，从而避免了共享网络中信号干扰和衰减。

Description

一种多个电力线网络之间协调方法及装置
本申请要求于2015年04月21日提交中国专利局、申请号为201510190891.6，发明名称为“一种多个电力线网络之间协调方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信处理领域，尤其涉及一种多个电力线网络之间协调方法及装置。
背景技术
现有电力线网络属于共享网络，共用媒介为电力线上传输的电波。因为电力线通信是总线型，并不能像以太网线那样，使得无关的站点之间能够被隔离。所以，在不考虑衰减的情况下，电力线上传输的电波，会被电力线上的所有站点收到。以电力线网络为例进行说明，电力线网络的结构如下图1所示，中央协调器(Central Coordinator，CCO)为变压器上的集中器，其他站点是电表，CCO和电表之间通过电力线连接。在实际应用中，通常几个变压器集中在一个地方，每个变压器上安装一个CCO模块，一个CCO模块与属于该CCO模块的站点(电表)形成一个电力线网络，多个变压器及其对应的站点组成多个电力线网络，图2示例的表示由3个变压器形成的多个电力线网络共存的场景。该实例中，3个变压器连接同一条总线，则三个变压器所属的三个电力线网络互为相邻网络。
共享网络中，站点之间通信时，都存在信号干扰的问题。如果两个站点同时发射信号，则发射出的信号会互相干扰，导致通信失败。或者来自网络中站点之外的电磁干扰，也会造成信号的干扰。
另外，站点之间通信还存在信号衰减的问题。如果两个站点之间距离较远，或者干扰严重，那么一个站点发出的信号，传送到另外一个站点时，就会严重的失真，导致无法识别。
为了解决共享网络中信号干扰和衰减的问题，现有技术中提供了以下两种方案，具体包括：
现有技术方案一：频分方案
将用于传输信道的总带宽划分成若干子频段，每一个的子频段均可作为一个独立的传输信道使用，每个网络对应一个子频段。但是因为电力线环境中，可用频段不多，大多数共享网络中，只有一种频段可使用。所以该方案将一个频段拆分为多个子频段，会导致带宽的利用率降低。
现有技术方案二：时分方案
将一个传输通道进行时间分割，每一个时隙只能供一个网络使用，多个网络交替使用不同的时隙(例如在第一个时隙分配周期里面，网络1使用时隙1，网络2对应使用时隙2，然后网络3对应的使用时隙3；后面的周期时隙分配原则与该时隙非配周期相同)，具体可参见图3。该方案的缺点是：电力线网络中，多网络一般在根节点处出现互通现象，网络中大部分子节点只能与所属网络中的节点进行通信，由于每个网络独占一个时隙，网络带宽利用率成倍下降，业务时延增大，无法满足现有的应用需求。
发明内容
本发明提供一种多个电力线网络之间协调方法及装置，本发明所提供的方法和装置解决现有共享网络中信号干扰和衰减问题。
第一方面，提供一种多个电力线网络之间协调方法，所述多个电力线网络包括第一电力线网络和第二电力线网络，第一电力线网络和第二电力线网络相邻，在一个时隙周期里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，所述信令时隙用于承载网络信令，所述数据时隙用于承载数据业务，所述方法包括：
所述第一电力线网络的中央协调器获取所述第二电力线网络的信令时隙信息；
所述第一电力线网络的中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
结合第一方面，在第一种可能的实现方式中，所述第一电力线网络的中央协调器获取所述第二电力线网络的信令时隙信息包括：
所述第一电力线网络的中央协调器接收多网络协调帧，从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息。
结合第一方面的第一种可能的实现方式，在第二种可能的实现方式中，所述网络协调帧为短帧结构。
结合第一方面，或者第一方面的第一至二种可能的实现方式中的任意一种，在第三种可能的实现方式中，所述根据预设的退避规则确定一个无竞争时隙作为所述第一电力线网络的信令时隙包括：
根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；
如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；
否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙。
结合第一方面，或者第一方面的第一至三种可能的实现方式中的任意一种，在第三种可能的实现方式中，所述预设的退避规则包括：
未开始的信令时隙退避已经开始的信令时隙；或，
无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网络；或，
网络标识号大的网络退避网络标识号小的网络。
结合第一方面，或者第一方面的第一至四种可能的实现方式中的任意一种，在第三种可能的实现方式中，所述第一电力线网络的中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突包括：
根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令时隙冲突；其中，所述持续时间，用于表示所述第二电力线网络需要申请占用的时隙长度；所述带宽结束标志位，用于表示所述第二电力线网络上个网络时隙是否已经结束；所述带宽结束偏移，用于表示所述第二电力线网络上个网络时隙结束时刻的时间偏移；所述带宽开始偏移，用于表示所述第二电力线网络下个网络时隙开始时刻的时间偏移。
第二方面，提供一种中央协调器，该中央协调器设置于多个电力线网络的 第一电力线网络中，该多个电力线网络还包括第二电力线网络，第一电力线网络和第二电力线网络相邻，并且在一个时隙周期里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，所述信令时隙用于承载网络信令，所述数据时隙用于承载数据业务，该中央协调器包括：
获取单元，用于获取所述第二电力线网络的信令时隙信息；
时隙确定单元，用于根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
结合第二方面，在第一种可能的实现方式中，获取单元还用于接收多网络协调帧，从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息，其中，所述网络协调帧为短帧结构。
结合第二方面或者第二方面的第一种可能的实现方式，在第二种可能的实现方式中，所述时隙确定单元还用于根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙。
结合第二方面，或者第二方面的第一至二种可能的实现方式中任意一种，在第三种可能的实现方式中，所述时隙确定单元还用于利用以下预设的退避规则中的任意一种确定一个无竞争时隙作为第一电力线网络的信令时隙：
未开始的信令时隙退避已经开始的信令时隙；或，
无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网络；或，
网络标识号大的网络退避网络标识号小的网络。
结合第二方面，或者第二方面的第一至三种可能的实现方式中任意一种，在第四种可能的实现方式中，所述时隙确定单元还用于根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令时隙冲突；其中，所述持续时间，用于表示所述第二电力线网络需要申请占用的时隙长度；所述带宽结束标 志位，用于表示所述第二电力线网络上个网络时隙是否已经结束；所述带宽结束偏移，用于表示所述第二电力线网络上个网络时隙结束时刻的时间偏移；所述带宽开始偏移，用于表示所述第二电力线网络下个网络时隙开始时刻的时间偏移。
第三方面，提供一种中央协调器，该中央协调器设置于多个电力线网络的第一电力线网络中，该多个电力线网络还包括第二电力线网络，第一电力线网络和第二电力线网络相邻，并且在一个时隙周期里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，所述信令时隙用于承载网络信令，所述数据时隙用于承载数据业务，该中央协调器包括处理器和存储器，其中，处理器通过调用存储器中存储的程序指令用于执行如下操作：
处理器，用于获取所述第二电力线网络的信令时隙信息；并根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
结合第三方面，在第一种可能的实现方式中，该中央处理器还包括接收器用于接收多网络协调帧；
则所述处理器还用于从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息，其中，所述网络协调帧为短帧结构。
结合第三方面或者第三方面的第一种可能的实现方式，在第二种可能的实现方式中，所述处理器还用于根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙。
结合第三方面，或者第三方面的第一至二种可能的实现方式中任意一种，在第三种可能的实现方式中，所述处理器还用于利用以下预设的退避规则中的任意一种确定一个无竞争时隙作为第一电力线网络的信令时隙：
未开始的信令时隙退避已经开始的信令时隙；或，
无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网络；或，
网络标识号大的网络退避网络标识号小的网络。
结合第三方面，或者第三方面的第一至三种可能的实现方式中任意一种，在第四种可能的实现方式中，所述处理器还用于根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令时隙冲突；其中，所述持续时间，用于表示所述第二电力线网络需要申请占用的时隙长度；所述带宽结束标志位，用于表示所述第二电力线网络上个网络时隙是否已经结束；所述带宽结束偏移，用于表示所述第二电力线网络上个网络时隙结束时刻的时间偏移；所述带宽开始偏移，用于表示所述第二电力线网络下个网络时隙开始时刻的时间偏移。
上述技术方案中的一个或两个，至少具有如下技术效果：
本发明提供的方法首先将信令时隙和数据时隙区分开，并利用多网络协调信令时隙的方式确定各网络对应的信令时隙，并且可以将不同的网络的信令时隙有序的错开，既保证信令时隙的不冲突(即避免了共享网络中信号干扰和衰减)，因为在一个时隙周期分配好各电力线网络所对应的网络时隙后，其他周期则重复操作，所以利用本发明所提供的方案能够保证信令发送的周期性；另外本发明提供的方法还可以提高多网络带宽利用率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术中共享网络物理拓扑示意图；
图2为现有技术中多网络共存场景图；
图3为现有技术中时分方案中多个网络时隙排列示意图；
图4为本发明实施例一提供的一种多个电力线网络之间协调方法的流程示意图；
图5为本发明实施例二提供的一种中央协调器的结构示意图；
图6为本发明实施例三提供的一种中央协调器的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
下面结合说明书附图对本发明实施例作进一步详细描述。
在本发明实施例中，由于网络信令属于网络控制信息，需要尽量保证网络信令在信道上可靠传输，因此需要给每个站点(与一个电力线网络对应)指定一个无竞争时隙用于传输网络信令，每个站点在指定的无竞争时隙发送网络信令时采用无竞争方式。站点发送数据帧时可以采用竞争方式发送。基于网络信令和数据业务发送的差异性，本发明实施例所提供的方法采用以下方式对多个电力线网络的时隙资源进行规划，具体包括：
实施例一
在该实施例中多个电力线网络组成电力线环境下的多网络系统，将该多个电力线网络的时隙资源被划分成多个网络时隙，并且每个网络时隙中包括一个信令时隙和一个数据时隙。具体的：
信令时隙：用于承载网络信令，由一个或多个信道无竞争周期(Contenttion Free Period，CFP)组成。网络信令中携带网络所对应的时隙信息、网络参数等网络控制信息，信道无竞争时隙属于独享时隙，在该时隙内的传输的数据可靠性高。
数据时隙：用于承载数据业务，由一个或多个信道竞争周期(Contenttion Period)组成，采用载波侦听多路访问(Carrier Sense Multiple Access，CSMA)竞争方式发送。信道竞争时隙属于共享时隙，由网络中所有站点共享使用，站点发送数据帧时采用竞争方式发送。
在本发明实施例中，多个网络之间进行时隙协调的主要机制是：任意两个电力线网络的信令时隙不重叠，某一电力线网络的数据时隙可以与其他网络的信令时隙或数据时隙重叠。信令时隙中数据被发送优先级高于数据时隙中数据被发送的优先级，当某一网络在数据时隙中监听到其他电力线网络在发送信令，则该电力线网络节点退避，等待信令发送结束。不同的电力线网络，需要 占用的信令时隙不同，所以意味着带宽也不同。通过本发明实施例提供的协调方法，可以将不同的电力线网络的信令时隙有序的错开，既保证信令时隙的不冲突，也要保证信令发送的周期性。
如图4所示，基于上述时隙资源的规划方法，本发明提供一种电力线环境下多个网络协调方法，当多个电力线网络包括第一电力线网络和第二电力线网络(该第二电力线网络可以包括多个)，第一电力线网络和第二电力线网络相邻(即第一电力线网络和第二电力线网络连接到同一条总线)，在一个时隙周期(在该实施例中，所述多个电力线网络中的每个电力线网络都分配了一个网络时隙则形成一个时隙周期)里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，该信令时隙用于承载网络信令，该数据时隙用于承载数据业务，方法具体包括：
步骤401，第一电力线网络的中央协调器获取所述第二电力线网络的信令时隙信息；
在本发明实施例中为了协调多个电力线网络，第一电力线网络在确定自身的信令时隙时，需要确定相邻电力线网络所对应的信令时隙是否与自身冲突，从而选择不与邻居网络的信令时隙重叠的信令时隙。
其中，多个电力线网络将自身的时隙信息通过一定的方式发送到相邻电力线网络，使得相邻电力线网络能够根据接收到时隙信息确定各相邻电力线网络的时隙，所以第一电力线网络的中央协调器获取第二电力线网络的信令时隙信息的具体实现方式可以是：
第一电力线网络的中央协调器接收多网络协调帧，从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息。
进一步，该网络协调帧可以采用短帧结构。本发明实施例所采用的短帧结构可以是16字节长度的短帧结构。因为短帧发送成功率高，所以采用短帧结构能够提高协调效果；另外短帧发送耗时短，能够减少网络维护报文对带宽的占用，给业务留更多带宽提高带宽资源的有效利用率。
步骤402，第一电力线网络的中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突；
在该实施例中，因为各电力线网络的信令时隙不能重叠，所以两个网络信令时隙在时间上有重叠部分则认为信令时隙冲突。(因为第一电力线网络在接 收到多网络协调帧时，可能已经分配好信令时隙(即预定信令时隙)。所以在接收到多网络协调帧确定邻居网络的信令时隙后，需要进一步的确定本网路的信令时隙是否与邻居网络的信令时隙冲突，并在冲突时进行协调。)
步骤403，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
其中，根据预设的退避规则确定一个无竞争时隙(为了保证信令时隙的可靠性，所以第一电力线网络在于相邻的电力线网络协调后，需要保证确定的时隙是独享的时隙)作为所述第一电力线网络的信令时隙包括：
根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；
如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；
否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙；并且发送调整消息到第二电力线网络，使得第二电力线网络根据调整消息重新选择一个时隙作为自身的信令时隙。
在本发明实施例中，退避规则可以通过多种方法确定，只要通过该退避规则可以确保两个网络对应信令时隙不重叠即可，以下提供几种可选的实现方式，具体包括：
A，未开始的信令时隙退避已经开始的信令时隙；
B，无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网络；
C，网络标识号大的网络退避网络标识号小的网络；
D，比较网络的预设优先级，优先级低的网络退避优先级高的网络。
在该实施例中，两个网络出现冲突可以通过一种退避方式确定需要退避的网络；另外也可以利用多种退避方式组合之后确定需要退避的网络。
为了让各网络之间能够相互之间发送消息，协调信令时隙，在本发明实施例中可以采用短帧结构的多网络协调帧来交互信令时隙，具体的该多网络协调帧可以是表1所示的结构：
Figure PCTCN2015095065-appb-000001
表1
表1中各参数的具体含义(后续描述中出现的“本网络”，是指发送网络协调帧的中央协调器所在网络，在该实施例中则可以是第二电力线网络)：
定界符类型，用来表示帧类型，接收到该帧时，通过定界符可以确认是否为多网络协调帧。在该实施例中多网络协调帧的定界符值可以是0b011。
接入指示，用于指示链路层协议数据单元(MAC Protocol Data Unit， MPDU)发送所在的网络类型；其中，接入指示的长度为1比特。如果接入指示的取值为0b1，表示在宽带载波通信接入网络中传输；如果接入指示的取值0b0，表示在homeplug nv网络中传递。
短网络标识，用于区分不同的宽带载波通信网络；有效取值为1-15。每个宽带载波通信网络都必须有一个唯一的短网络标识(Short Network Identifier，SNID)。
短网络标识高位字节，用于表示站点可以接收到的宽带载波通信网络的短网络标识；短网络标识高位字节是一个9比特的字段，表示站点可以接收到的宽带载波通信网络的短网络标识。每一个比特对应一个短网络标识，比特0表示短网络标识为7的宽带载波通信网络，比特1表示短网络标识为8的网络，其余类推，表示的短网络标识范围为7-15。比特位值为0，表示该宽带载波通信网络的报文未接收过；比特位值为1，表示该宽带载波通信网络的报文可以接收到。
持续时间，用于表示本网络需要申请占用的时隙长度；持续时间是一个14比特的字段，表示本网络需要申请占用的时隙长度。单位：40ms。
协调标志位，用于表示当前MPDU是否为网间协调帧；协调标志位是1比特的字段。在网间协调帧中，该比特的值为1。
带宽结束标志位，用于表示本网络上个带宽周期是否已经结束；带宽结束标志位是1比特的字段，比特位的值为1，表示上个带宽周期已经结束；值为0，则表示上个带宽周期未结束。
短网络标识低位字节，用于表示站点可以接收到的宽带载波通信网络的短网络标识；短网络标识低位字节是一个6比特的字段，每一个比特对应一个SNID，比特0表示短网络标识为1的宽带载波通信网络，比特1表示短网络标识为2的网络，其余类推，表示的短网络标识范围为1-6。比特位的值为0，表示该宽带载波通信网络的报文未接收过；比特位的值为1，表示该宽带载波通信网络的报文可以接收到。
带宽结束偏移，上个带宽时隙结束时刻的时间偏移，单位：40ms。当上个带宽时隙已经结束时(带宽结束标志位为1)，该偏移时间，表示从上个带宽时隙结束时刻，到当前时刻的时间偏移。当上个带宽时隙未结束时(带宽结束标志位为0)，该偏移时间，表示从当前时刻，到当前带宽时隙结束时刻的 时间偏移。
带宽开始偏移，下个带宽时隙开始时刻的时间偏移，单位：40ms。当下个带宽时隙未开始时，该偏移时间，表示从当前时刻，到下个带宽时隙开始时刻的时间偏移。当下个带宽时隙已经开始时，该偏移时间的值为0。
进一步，因为本发明实施例所提供的方法是针对多网络的情况，所以每一个网络都会接收到多个邻居网络的多网络协调帧，为了统一的管理多个网络的时隙分配情况，基于上述表1多网络协调帧所提供的参数当前网络可以选用表格的形式对多个邻居网络的信息进行管理，具体可以将多网络协调帧的信息更新到临近网络信息表中，如表2所示：
Figure PCTCN2015095065-appb-000002
表2
根据表1所示的多网络协调帧结构，以及表2所提供的对多个邻居网络的信息管理方式，在本发明实施例中第一电力线网络的中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突以及中央协调器选择与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙具体包括：
根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令 时隙冲突。
在具体实现时，第一电力线网络的中央协调器可以根据第二电力线网络对应的时隙持续时间确定第二电力线网络对应的第二时隙所占用的时长，然后再根据带宽标志位确定上个网络时隙是否已经结束；如果结束，则利用该带宽结束偏移对应的偏移时间，确定从上个带宽时隙结束时刻，到当前时刻的时间偏移；另外还利用带宽开始偏移，用于确定下个带宽时隙是否开始，如果未开始，则可以根据该偏移时间，确定当前时刻，到下个带宽时隙开始时刻的时间偏移。
因为持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移给出了每个电力线网络在两个时隙周期里面所会占用的时隙，所以在判断是否冲突的时候就可以根据持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移确定时隙是否冲突。另外，在选择无竞争时隙作为第一电力线网络的信令时隙时，也可以是根据持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移所确定的每个电力线网络所占用的时间来避免信令时隙的重叠，从而避免冲突。
实施例二
如图5所示，本实施例提供一种中央协调器，该中央协调器500设置于多个电力线网络的第一电力线网络中，该多个电力线网络还包括第二电力线网络，第一电力线网络和第二电力线网络相邻，并且在一个时隙周期里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，所述信令时隙用于承载网络信令，所述数据时隙用于承载数据业务，该中央协调器包括：
获取单元501，用于获取所述第二电力线网络的信令时隙信息；
在本发明实施例中为了协调多个电力线网络，第一电力线网络在确定自身的信令时隙时，需要确定相邻电力线网络所对应的信令时隙是否与自身冲突，从而选择不与邻居网络的信令时隙重叠的信令时隙。
其中，多个电力线网络将自身的时隙信息通过一定的方式发送到相邻电力线网络，使得相邻电力线网络能够根据接收到时隙信息确定各相邻电力线网络的时隙，所以：
该获取单元501还用于接收多网络协调帧，从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息，其中，所述网络协调帧为短帧结构。
时隙确定单元502，用于根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
在该实施例中，根据预设的退避规则确定一个无竞争时隙(为了保证信令时隙的可靠性，所以第一电力线网络在于相邻的电力线网络协调后，需要保证确定的时隙是独享的时隙)作为所述第一电力线网络的信令时隙时，包括：
该时隙确定单元502还用于根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙。
其中，时隙确定单元502具体采用的退避规则包括多种，在该实施例提供了几种可实现的方式，则：
该时隙确定单元502可以利用以下预设的退避规则中的任意一种确定一个无竞争时隙作为第一电力线网络的信令时隙：
未开始的信令时隙退避已经开始的信令时隙；或，
无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网络；或，
网络标识号大的网络退避网络标识号小的网络。
根据表1所示的多网络协调帧结构，在本实施例中中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突以及中央协调器选择与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙包括：
该时隙确定单元502还用于根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令时隙冲突；其中，所述持续时间，用于表示所述第二电力线网络需要申请占用的时隙长度；所述带宽结束标志位，用于表示所述第二电力线网络上个网络时隙是否已经结束；所述带宽结束偏移，用于表示所述第二电力线网络上个网络时隙结束时刻的时间偏移；所述带宽开始偏移，用于表示所述第二电力线网络下个网络时隙开始时刻的时间偏移。
实施例三
如图6所示，本发明实施例提供一种中央协调器，该中央协调器600设置于多个电力线网络的第一电力线网络中，该多个电力线网络还包括第二电力线网络，第一电力线网络和第二电力线网络相邻，并且在一个时隙周期里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，所述信令时隙用于承载网络信令，所述数据时隙用于承载数据业务，该中央协调器包括处理器601和存储器602，其中，处理器601通过调用存储器602中存储的程序指令用于执行如下操作：
处理器601，用于获取所述第二电力线网络的信令时隙信息；并根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
该中央处理器还包括接收器603用于接收多网络协调帧；
则该处理器601还用于从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息，其中，所述网络协调帧为短帧结构。
在该实施例中，根据预设的退避规则确定一个无竞争时隙(为了保证信令时隙的可靠性，所以第一电力线网络在于相邻的电力线网络协调后，需要保证确定的时隙是独享的时隙)作为所述第一电力线网络的信令时隙时，包括：
该处理器601还用于根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙。
其中，在本发明实施例中，退避规则的主要作用是确定冲突的两个电力线网络谁进行退避(即通过某种方式确定两个电力线网络的优先级)，所以具体采用的退避规则包括多种，在该实施例提供了几种可实现的方式，则：
该处理器601还用于利用以下预设的退避规则中的任意一种确定一个无竞争时隙作为第一电力线网络的信令时隙：
未开始的信令时隙退避已经开始的信令时隙；或，
无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网 络；或，
网络标识号大的网络退避网络标识号小的网络。
根据表1所示的多网络协调帧结构，在本实施例中中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突以及中央协调器选择与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙具体实现可以是：
处理器601还用于根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令时隙冲突；其中，所述持续时间，用于表示所述第二电力线网络需要申请占用的时隙长度；所述带宽结束标志位，用于表示所述第二电力线网络上个网络时隙是否已经结束；所述带宽结束偏移，用于表示所述第二电力线网络上个网络时隙结束时刻的时间偏移；所述带宽开始偏移，用于表示所述第二电力线网络下个网络时隙开始时刻的时间偏移。
本申请实施例中的上述一个或多个技术方案，至少具有如下的技术效果：
本发明提供的方法首先将信令时隙和数据时隙区分开，并利用多网络协调信令时隙的方式确定各网络对应的信令时隙，并且可以将不同的网络的信令时隙尽量的有序的错开，既保证信令时隙的不冲突(即避免了共享网络中信号干扰和衰减)，也保证了信令发送的周期性；另外本发明提供的方法还可以提高多网络带宽利用率。
另外，各网络在协调信令时隙时采用短帧发送消息，因为短帧发送成功率高，所以采用短帧结构能够提高协调效果；另外短帧发送耗时短，能够减少网络维护报文对带宽的占用，给业务留更多带宽提高带宽资源的有效利用率。
本发明所述的方法并不限于具体实施方式中所述的实施例，本领域技术人员根据本发明的技术方案得出其它的实施方式，同样属于本发明的技术创新范围。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (11)

  1. 一种多个电力线网络之间协调方法，其特征在于，所述多个电力线网络包括第一电力线网络和第二电力线网络，第一电力线网络和第二电力线网络相邻，在一个时隙周期里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，所述信令时隙用于承载网络信令，所述数据时隙用于承载数据业务，所述方法包括：
    所述第一电力线网络的中央协调器获取所述第二电力线网络的信令时隙信息；
    所述第一电力线网络的中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
  2. 如权利要求1所述的方法，其特征在于，所述第一电力线网络的中央协调器获取所述第二电力线网络的信令时隙信息包括：
    所述第一电力线网络的中央协调器接收多网络协调帧，从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息。
  3. 如权利要求2所述的方法，其特征在于，所述网络协调帧为短帧结构。
  4. 如权利要求1～3任一所述的方法，其特征在于，所述根据预设的退避规则确定一个无竞争时隙作为所述第一电力线网络的信令时隙包括：
    根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；
    如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；
    否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙。
  5. 如权利要求1～4任一所述的方法，其特征在于，所述预设的退避规则包括：
    未开始的信令时隙退避已经开始的信令时隙；或，
    无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网络；或，
    网络标识号大的网络退避网络标识号小的网络。
  6. 如权利要求1～5任一所述的方法，其特征在于，所述第一电力线网络的中央协调器根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突包括：
    根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令时隙冲突；其中，所述持续时间，用于表示所述第二电力线网络需要申请占用的时隙长度；所述带宽结束标志位，用于表示所述第二电力线网络上个网络时隙是否已经结束；所述带宽结束偏移，用于表示所述第二电力线网络上个网络时隙结束时刻的时间偏移；所述带宽开始偏移，用于表示所述第二电力线网络下个网络时隙开始时刻的时间偏移。
  7. 一种中央协调器，其特征在于，该中央协调器设置于多个电力线网络的第一电力线网络中，该多个电力线网络还包括第二电力线网络，第一电力线网络和第二电力线网络相邻，并且在一个时隙周期里第一电力线网络和第二电力线网络分别对应一个网络时隙，其中，每个网络时隙中包括一个信令时隙和一个数据时隙，所述信令时隙用于承载网络信令，所述数据时隙用于承载数据业务，该中央协调器包括：
    获取单元，用于获取所述第二电力线网络的信令时隙信息；
    时隙确定单元，用于根据所述信令时隙信息确定第一电力线网络的预定信令时隙是否与第二电力线网络的信令时隙冲突，如果所述预定信令时隙与第二电力线网络的信令时隙存在冲突，则根据预设的退避规则确定一个无竞争时隙作为第一电力线网络的信令时隙。
  8. 如权利要求7所述的中央协调器，其特征在于，获取单元还用于接收多网络协调帧，从所述多网络协调帧中获取所述第二电力线网络的信令时隙信息，其中，所述网络协调帧为短帧结构。
  9. 如权利要求7或8所述的中央协调器，其特征在于，所述时隙确定单元还用于根据预设的退避规则判断所述第一电力线网络是否需要退避所述第二电力线网络；如果是，则选择一个与第二电力线网络的信令时隙不冲突的信令时隙作为所述第一电力线网络的信令时隙；否则，将所述预设信令时隙作为所述第一电力线网络的信令时隙。
  10. 如权利要求7～9任一所述的中央协调器，其特征在于，所述时隙确定 单元还用于利用以下预设的退避规则中的任意一种确定一个无竞争时隙作为第一电力线网络的信令时隙：
    未开始的信令时隙退避已经开始的信令时隙；或，
    无法接收到邻居网络的消息的网络退避可以接收到邻居网络的消息的网络；或，
    网络标识号大的网络退避网络标识号小的网络。
  11. 如权利要求7～10任一所述的中央协调器，其特征在于，所述时隙确定单元还用于根据所述信令时隙信息中携带的持续时间、带宽结束标志位、带宽结束偏移和带宽开始偏移判断所述预定信令时隙是否与所述第二电力线网络的信令时隙冲突；其中，所述持续时间，用于表示所述第二电力线网络需要申请占用的时隙长度；所述带宽结束标志位，用于表示所述第二电力线网络上个网络时隙是否已经结束；所述带宽结束偏移，用于表示所述第二电力线网络上个网络时隙结束时刻的时间偏移；所述带宽开始偏移，用于表示所述第二电力线网络下个网络时隙开始时刻的时间偏移。
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