CN102904610B - Node recovering method and equipment for power line communication - Google Patents
Node recovering method and equipment for power line communication Download PDFInfo
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Abstract
The invention provides a node recovering method and node recovering equipment for power line communication. The method comprises the following steps of: when a node does not receive beacon instruction information within a preset time, sending a beacon retransmission request message to a beacon proxy (BPR), and receiving a beacon retransmission response message returned from the BPR, wherein the beacon retransmission response message carries domain state information; and when the domain state information indicates that the domain state of the node indicated is a domain master (DM) fault, a backup DM is started and the node determines that the BPR is a hidden node of the backup DM, sending a request node application BPR message to a relay node in a domain, wherein the request node application BPR message carries equipment identifier of the node, so that the relay node can apply the backup DM for the BPR of the node according to the request node application BPR message. By the method, the node recovery efficiency is improved and influence on node service is reduced.
Description
Technical field
The present invention relates to communication technical field, relate in particular to node restoration methods and equipment in a kind of power line communication.
Background technology
Power line communication is to utilize high-voltage power line (35kV and above), medium voltage power line (10-30kV electric pressure) or low-voltage power line (380/220kV subscribers feeder) to carry out a kind of specific communication mode of communication as information transmitting medium.This technology is loaded into the high-frequency signal of carrying information on power line, carries out transfer of data with power line, by special power line modulator/demodulator, high-frequency signal is separated from power line, is sent to terminal equipment.
Power line communication can be divided into arrowband and broadband connections, wherein, arrowband power line communication (Narrowband Power Line Communication, be called for short: in network NB-PLC), physical network is logically divided into multiple territories, in each territory, (Domain Master is called for short: DM) to have a node to serve as primary domain controller.In the time that territory is operated in beacon patterns, this DM is responsible for sending beacon to node in territory, in beacon, comprised the information such as bandwidth, domain name, safe class, frequency range planning, node can join in territory by receiving beacon, and according to the territory work requirements specifying in beacon, required parameter is set; DM also can in territory, specify some beacons agency (Beacon Proxies, be called for short: BPR), by this BPR, beacon is sent to the concealed nodes (cannot directly receive the node of the beacon that DM sends) of relative DM, to expand the coverage in territory.
In order to improve network reliability, DM also can select a DM for subsequent use in territory, in the time that DM for subsequent use detects that DM occurs equipment fault or goes offline, is enabled and is served as new DM by DM for subsequent use.In the time of DM fault, node cannot receive the beacon that this DM sends, and, enable and become after new DM at DM for subsequent use, likely this node is concealed nodes with respect to DM for subsequent use, can not receive by certain BPR the beacon of this DM for subsequent use, now, node becomes isolated node.Node need to be carried out the flow process that again networks, re-start the search in territory, when again searching behind suitable territory, the DM in territory sends the request of networking, and DM may be that direct the determining whether of sending or send by via node of node need to be specified new BPR according to this request.This re-starts the search in territory and the process of networking has larger time delay, makes the speed of the normal work of node recovery in the time of DM fault slower, causes the interruption of node traffic, and business normal transmission is caused and had a strong impact on.
Summary of the invention
The invention provides node restoration methods and equipment in a kind of power line communication, recover the time delay of normal work to reduce node, reduce DM fault and node traffic is transmitted to the impact causing.
One aspect of the present invention is to provide node restoration methods in a kind of power line communication, comprising:
When node does not receive beacon indication information in Preset Time, act on behalf of BPR send beacon re-transmission request message to beacon, and receive the beacon repeating transmission response message that described BPR returns, described beacon is retransmitted response message and is carried territory state information;
Described node shows that in described territory state information territory state is that DM fault and DM for subsequent use enable, and, when described in described node determination, BPR is concealed nodes with respect to DM for subsequent use, via node in territory sends request node application BPR message, the device identification that described request node application BPR message is carried described node, to make described via node according to described request node application BPR message, apply to become the BPR of described node corresponding to described device identification to described DM for subsequent use.
In a kind of possible implementation, described beacon indication information comprises: the DM that the beacon that DM sends, the R-beacon that BPR sends and DM for subsequent use send loses indication information, and it is that described DM for subsequent use sends in the time that definite DM loses that described DM loses indication information.
In another kind of possible implementation, described node is acted on behalf of BPR to beacon and is sent beacon re-transmission request message, comprising: described node broadcasts sends described beacon re-transmission request message; Described via node in territory sends request node application BPR message, comprising: described node broadcasts sends described request node application BPR message.
In another possible implementation, described node is acted on behalf of BPR to beacon and is sent beacon re-transmission request message, comprise: the topology information of described node analysis self, determine and the described BPR of described node direct communication, and send described beacon re-transmission request message to described BPR;
Described via node in territory sends request node application BPR message, comprise: the topology information of described node analysis self, determine the via node in territory, and described via node can communicate by letter with described DM for subsequent use, send described request node application BPR message to described via node.
In another possible implementation, if described node is non-BPR node, described method also comprises: if the territory state information that described beacon repeating transmission response message carries shows that described BPR is just in Recovery processing, and do not receive yet described BPR through Preset Time and be successfully recovered indication information, described node is carried out the flow process that again networks.
Another aspect of the present invention is to provide node restoration methods in a kind of power line communication, comprising:
What via node in DM acceptance domain for subsequent use sent applies to become BPR message, described in apply to become BPR message and carry described via node by the device identification of the node of service; The described BPR of applying to become message is that described node is that DM fault and DM for subsequent use enable at definite territory state, and the BPR of described node indicates described via node to send while being the concealed nodes of DM for subsequent use;
Described DM for subsequent use specifies the BPR of described via node as described node corresponding to described device identification.
In a kind of possible implementation, before what via node in DM acceptance domain for subsequent use sent apply to become BPR message, also comprise: described DM for subsequent use sends DM to the BPR of described node and loses Indication message, to make described BPR in the time receiving the beacon re-transmission request message of described node, lose Indication message according to described DM, retransmit in response message at the beacon returning to described node that territory state information is set to DM fault and DM for subsequent use enables.
In another kind of possible implementation, before described DM for subsequent use sends DM loss Indication message to the BPR of described node, also comprise: when described DM for subsequent use does not receive beacon or R-beacon in Preset Time, send beacon re-transmission request message to DM or BPR, carry the beacon identity of request; If do not receive the beacon that described beacon identity is corresponding in Preset Time, described DM for subsequent use judges that DM loses, and carries out the step that the described transmission of the BPR to described node DM loses Indication message.
In another possible implementation, after described DM for subsequent use sends DM loss Indication message to the BPR of described node, also comprise: lose response message if do not receive DM in Preset Time, described DM for subsequent use judges that DM loses, and described DM for subsequent use enables becomes new DM.
Another aspect of the present invention is to provide a kind of node, comprising:
Message processing unit, for do not receive beacon indication information in Preset Time time, acts on behalf of BPR to beacon and sends beacon re-transmission request message, and receives the beacon that described BPR returns and retransmit response message, and described beacon is retransmitted response message and carried territory state information;
Status determining unit, for determining that according to described territory state information territory state is that DM fault and DM for subsequent use enable, and determines that described BPR is concealed nodes with respect to DM for subsequent use;
Application indicating member, for determining that in described status determining unit DM fault and DM for subsequent use enable, and determine when described BPR is the concealed nodes of DM for subsequent use, via node in territory sends request node application BPR message, the device identification that described request node application BPR message is carried described node, to make described via node according to described request node application BPR message, apply to become the BPR of described node corresponding to described device identification to described DM for subsequent use.
In a kind of possible implementation, described message processing unit, specifically for beacon re-transmission request message described in broadcast transmission, or, broadcast transmission described request node application BPR message.
In another kind of possible implementation, described status determining unit, specifically for analyzing the topology information of self, determines the BPR with described node direct communication; Also, for analyzing the topology information of self, determine the via node in territory, and described via node can be communicated by letter with described DM for subsequent use;
Described message processing unit, specifically for send described beacon re-transmission request message to described BPR, or, send described request node application BPR message to described via node.
Another aspect of the present invention is to provide a kind of DM for subsequent use, comprising:
Application receiving element, what send for the via node of acceptance domain applies to become BPR message, described in apply to become BPR message and carry described via node by the device identification of the node of service; The described BPR of applying to become message is that described node is that DM fault and DM for subsequent use enable at definite territory state, and the BP R of described node indicates described via node to send while being the concealed nodes of DM for subsequent use;
Function designating unit, is used to specify the BPR of described via node as described node.
In a kind of possible implementation, also comprise: beacon request unit, for do not receive beacon or R-beacon in Preset Time time, send beacon re-transmission request message to DM or BPR, carry the beacon identity of request;
Lose indicating member, when do not receive beacon corresponding to described beacon identity in Preset Time when described beacon request unit, send DM loss Indication message to the BPR of described node.
In power line communication provided by the invention, the technique effect of node restoration methods and equipment is: in this scheme, when node does not receive beacon indication information in Preset Time, can own initiatively judge network state and oneself state, and be defined as DM fault and DM for subsequent use enables, when BPR DM relatively for subsequent use is concealed nodes, active request via node applies to become BPR, and DM for subsequent use can specify via node to become BPR; Than prior art, in the present invention program, node judges by active, after being specified to for isolated node, without carrying out the flow process that again networks, re-start the processes such as the search in territory, via node can apply to become the BPR of described node as early as possible to DM for subsequent use, node can be recovered as early as possible, has reduced node in the time of DM fault and has recovered the time delay of normal work, improve the efficiency that node recovers, reduced business is transmitted to the impact causing.
Brief description of the drawings
Fig. 1 is the system architecture diagram of node restoration methods embodiment application in power line communication of the present invention;
Fig. 2 is the schematic flow sheet of node restoration methods one embodiment in power line communication of the present invention;
Fig. 3 is the schematic flow sheet of another embodiment of node restoration methods in power line communication of the present invention;
Fig. 4 is the DM state decision flow chart in the another embodiment of node restoration methods in power line communication of the present invention;
Fig. 5 is the signalling diagram of the another embodiment of node restoration methods in power line communication of the present invention;
Fig. 6 is the signalling diagram of the another embodiment of node restoration methods in power line communication of the present invention;
Fig. 7 is the structural representation of node embodiment of the present invention;
Fig. 8 is the structural representation of the present invention DM embodiment for subsequent use.
Embodiment
Fig. 1 is the system architecture diagram of node restoration methods embodiment application in power line communication of the present invention, as shown in Figure 1, that this system represents is arrowband PLC(Power Line Communication, power line communication) one of them territory in network, the physical network of Shi Jiang arrowband, this territory PLC is logically divided the network portion obtaining.This territory comprises multiple nodes, and wherein each node can have respectively different functional roles, for example, comprise DM, DM for subsequent use, BPR, via node and ordinary node etc.In an embodiment of the present invention, use above-mentioned concept, in order to make more clear in follow-up description and easily to understand, first above-mentioned concept be described as follows:
Wherein, DM: be the master controller in territory, be in charge of, coordinate other nodes in territory, in the territory that works in beacon patterns, DM realizes control and the maintenance to territory by broadcast beacon (Beacon), has comprised the information such as bandwidth, mode of operation, domain name, safe class, frequency range planning in this beacon;
DM for subsequent use: be mainly used in, in the time detecting that DM breaks down or goes offline, becoming new DM, replace fault DM to carry out the function that territory is controlled and safeguarded;
BPR: beacon agency, due to the restriction of the topological connection relation between the each node in territory, some node may not directly receive the beacon that DM sends, be that node and DM may not direct communications, now, node is concealed nodes with respect to DM, and DM can specify BPR for this node, and the beacon that this BPR can send according to the DM receiving regenerates and send R-beacon (relay beacon);
Via node: DM can specify some node with relay function as via node, can forward for node traffic (data, control, management frames), such as can forwarding service between node A and DM, but, this via node is different from BPR, via node can not send R-beacon, unless this via node is appointed as BPR by DM.
Referring to Fig. 1, suppose that DM breaks down, DM for subsequent use enables, now, some node is node A for example, it may not be concealed nodes with respect to DM originally, but with respect to DM for subsequent use for concealed nodes; And the original BPR of this node A is also concealed nodes with respect to DM for subsequent use, becomes after new DM at DM for subsequent use, node A can not obtain beacon message by BPR, is equivalent to node A and this territory disconnects.If according to prior art, the flow process that node A need to re-execute web search and again network, but, the embodiment of the present invention provides a kind of node restoration methods, node A can be by judging territory state and node oneself state, avoiding carrying out above-mentioned again networking flow process in the situation that, make node A again can receive beacon message; To describe the node restoration methods of the embodiment of the present invention in detail below:
Embodiment mono-
Fig. 2 is the schematic flow sheet of node restoration methods one embodiment in power line communication of the present invention, and this method can be that node is carried out, for example, be to be carried out by the node A in Fig. 1.As shown in Figure 2, the method can comprise:
201,, when node does not receive beacon indication information in Preset Time, act on behalf of BPR to beacon and send beacon re-transmission request message;
Wherein, described beacon indication information, for example, comprise: the DM that the beacon that DM sends, the R-beacon that BPR sends and DM for subsequent use send loses indication information; In Preset Time, above-mentioned several information all do not receive, and send beacon re-transmission request message.
Described Preset Time, can consider that the transmission time interval of beacon, R-beacon, DM lose on the basis of transmission stand-by period of indication information, set the length of this Preset Time,, can receive in this Preset Time if above-mentioned information all normally sends to ensure.
It should be noted that, described act on behalf of BPR to beacon and send beacon re-transmission request message, comprising: to this BPR clean culture or multicast sends or broadcast transmission and the mode that received by this BPR; And the present embodiment does not limit node and only sends beacon re-transmission request message to BPR, can also comprise yet: node sends to all nodes in the territory such as DM, DM for subsequent use.
Described beacon re-transmission request message can be carried the beacon identity of node institute request repeat; And, this beacon re-transmission request message can also be carried the type of the node of this request message, for example, node request or DM for subsequent use request, to make beacon transmitting node (such as DM or BPR etc.) retransmit in response and can carry the different content corresponding from node type at the beacon returning; Such as, if node request can be retransmitted in response message and carry territory state information at beacon, judge accordingly network state for node.Certainly, no matter can default setting be also the beacon repeating transmission response message which kind of type is all returned to same format.
202, node receives the beacon repeating transmission response message that BPR returns, and described beacon is retransmitted response message and carried territory state information;
Wherein, described territory state information (Domain Status) can comprise: DM is normal; Or DM fault and DM for subsequent use enable; Or, the unknown; Deng; In concrete enforcement, can adopt different symbols to represent different states, for example, 00 represents that DM is normal, and 01 represents that DM fault and DM for subsequent use enable etc.In follow-up embodiment in detail, the optional example of this beacon repeating transmission response message will be described.
Retransmit the territory state information in response message when the beacon that node is returning according to BPR, determine that current territory state is: DM fault and DM for subsequent use enable; And this node is also determined when its original BPR becomes the concealed nodes of DM for subsequent use, continues to carry out 203.
Because in this case, node is concealed nodes with respect to DM for subsequent use, cannot directly receive beacon; And its original BPR is also concealed nodes with respect to DM for subsequent use, make this node also possibly cannot receive R-beacon; Therefore, after DM fault and DM for subsequent use enable, this node may become isolated node, need to carry out 203 and recover.
Its original BPR of described node determination becomes the concealed nodes of DM for subsequent use, and definite mode can have multiple; For example, if node self has been preserved complete topology information, can just learn whether node self or BPR are concealed nodes with respect to DM for subsequent use by analyzing topology information; Obtain above-mentioned relation if the topology information of node self is not enough to analyze, node can be retransmitted another information of carrying in response message by beacon, and whether the BPR that sends this response message is that concealed nodes is determined with respect to DM for subsequent use.
203, node sends request node application BPR message to the via node in territory;
Wherein, described requesting node application BPR message, is used to indicate via node and sends and apply to become BPR message to DM for subsequent use, makes via node initiatively apply to become the BPR of node corresponding to device identification to DM for subsequent use.Because, this via node is the via node between node and DM for subsequent use, can communicate by letter with DM for subsequent use with DM direct communication for subsequent use or by the forwarding of other via nodes, if DM for subsequent use specifies this via node to become BPR, via node just can send R-beacon, and node just can receive beacon message.
The device identification of carrying node in described requesting node application BPR message, make via node in the time applying to become BPR to DM for subsequent use, this device identification can be reported to DM for subsequent use, inform that this via node of DM for subsequent use, for which node service, makes DM for subsequent use learn the service relation between via node and node; And, after DM for subsequent use enables, become the master controller in territory, its can store BPR and the node of serving between corresponding relation.
Described node sends request node application BPR message to via node, comprising: send or broadcast transmission and the mode that received by this via node to this via node clean culture or multicast.
The node restoration methods of the present embodiment, be by node in the time not receiving beacon indication information, oneself initiatively judge territory state and oneself state, and be defined as DM fault and DM for subsequent use enables, when BPR DM relatively for subsequent use is concealed nodes, active request via node application BPR, specifies via node to become BPR by DM for subsequent use; This mode re-starts web search and again networks after having avoided node to become isolated node, has reduced the time delay that node recovers, and node can be recovered as early as possible.
Embodiment bis-
Fig. 3 is the schematic flow sheet of another embodiment of node restoration methods in power line communication of the present invention, and this method can be that DM for subsequent use carries out, it should be noted that, and be in DM fault or after going offline, DM for subsequent use becomes and carries out after DM; As shown in Figure 3, can comprise:
What 301, the via node in DM acceptance domain for subsequent use sent applies to become BPR message;
The described BPR of applying to become message is carried described via node by the device identification of the node of service; The described BPR of applying to become message is that node is that DM fault and DM for subsequent use enable at definite territory state, and in the time that the BPR of described node before DM for subsequent use enables is concealed nodes with respect to DM for subsequent use, indicates described via node to send;
302, DM for subsequent use specifies the BPR of described via node as described node.
By to be operated in territory under asynchronous beacon patterns as example, the node restoration methods of the embodiment of the present invention is described below; Wherein, asynchronous beacon patterns refers to, and does not define specific beacon period boundary, and beacon is determined to send by DM, and R-beacon is determined to send by BPR, and within the time cycle of definition, each beacon at least will send once.
In the method implementation of following embodiment, use several message, for example, beacon re-transmission request message, beacon are retransmitted response message, DM loses Indication message and DM loses response message, describe for the method after aspect, first the Optional Form of these several message be listed below here:
Table 1 beacon re-transmission request message
Table 2 beacon is retransmitted response message
Table 3 DM loses Indication message
Table 4 DM loses response message
In addition, in the judgement of node before sending beacon re-transmission request message, use the DM loss Indication message that DM for subsequent use sends in the time judging that DM loses, so, in following explanation, to first describe the deterministic process of DM for subsequent use to DM state under asynchronous beacon patterns, how DM for subsequent use judges that it is due to the DM fault that is not intended to by user to extract or the reason such as equipment fault causes that what DM lost, the DM are here lost; The processing when state of description node self judgement and DM fault more on this basis.
Fig. 4 is the DM state decision flow chart in the another embodiment of node restoration methods in power line communication of the present invention, and this DM state judgement is that DM for subsequent use carries out, and as shown in Figure 4, this determination methods comprises:
401, when DM for subsequent use does not receive beacon message within certain period, send beacon re-transmission request message to beacon transmitting node, carry the beacon identity of request;
Described beacon message can be beacon or R-beacon, and described beacon transmitting node can be DM or BPR.Concrete:
For example, in the time that DM for subsequent use is not concealed nodes with respect to DM, DM for subsequent use can set, after upper certain beacon (beacon identity is for example BCN_ID1) that once receives DM transmission, send maximum time interval through BCNMaxT(beacon) time, if DM for subsequent use does not receive beacon or R-beacon (beacon message that the beacon identity that is BPR forwarding is BCN_ID1+1) that beacon identity is BCN_ID1+1, DM for subsequent use sends beacon re-transmission request message to DM, at least carries: the beacon identity BCN_ID of request in this message.
Again for example, in the time that DM for subsequent use is concealed nodes with respect to DM, DM for subsequent use can set, after upper certain R-beacon (beacon identity is for example BCN_ID1) that once receives first BPR transmission, through the time of BCNMaxT, if DM for subsequent use does not receive the R-beacon that beacon identity is BCN_ID1+1, DM for subsequent use can broadcast beacon re-transmission request message, at least carries: the beacon identity BCN_ID of request in this message.
Described beacon re-transmission request message, can adopt the form shown in table 1; For example, the ReqBCN_ID1 in table 1, ReqBCN_ID2, ReqBCN_ID3 are exactly multiple beacon identities that do not receive of DM request for subsequent use.In addition, in this beacon re-transmission request message, can show by ReqType the type of this request message, be the request being sent by DM for subsequent use, or the request (in the time that follow-up nodes for state judges, also needing to send beacon re-transmission request message) being sent by ordinary node.
402, DM for subsequent use judges in Preset Time, whether to receive the beacon repeating transmission response message that beacon transmitting node is returned;
Described beacon is retransmitted response message, can be that DM or BPR send, if DM is normal, beacon transmitting node can be retransmitted in response message and carry the beacon content that asked beacon identity is corresponding at described beacon.
Described Preset Time can be called T1; If DM or BPR are normal, conventionally can return to beacon shown in table 2 and retransmit response message, in this response message, carry the information in the beacon of request; Such as BCN Presence Flag, Various in table 2 are for returning to request beacon, wherein, in Various, can comprise the content of several beacons, be arranged in order in order.
Wherein, the setting of above-mentioned preset time T 1 is based on following consideration: if DM or BPR are normal, can receive after beacon re-transmission request message, send beacon and retransmit response message, in this response message, carry the content of the beacon of request, this message should send with limit priority, this preset time T 1 is at least the time that sends a request message to DM or BPR success competitive channel transmission response message from DM for subsequent use, and namely this waits the time that the frame sequence of the message of sending out can exist in buffer memory; The concrete numerical value that T1 sets, can specifically set according to actual conditions, can set according to the needed time of processing procedure corresponding to this T1.The setting of other Preset Times that occur is in embodiments of the present invention also based on similar above-mentioned consideration, sets according to actual conditions are concrete.
In this step, if the judged result of DM for subsequent use is yes, received the request beacon returning, can judge accordingly that DM does not lose, DM is normal, and DM for subsequent use does not do subsequent treatment; Otherwise, if the judged result of DM for subsequent use is no, in Preset Time, do not receive beacon and retransmit response message, even or received the beacon that BPR returns and retransmit response message, but in message, indicate BPR self also not receive this beacon, DM for subsequent use can judge that DM loses accordingly.
Optionally, in order to ensure the reliability of DM for subsequent use to the judgement of DM state, in the time that DM for subsequent use judges that DM loses, can continue to carry out 403;
403, DM broadcast DM for subsequent use loses Indication message;
Wherein, this DM loses Indication message can adopt the form shown in table 3, and instruction DM loses, and can comprise: start not receive beacon from which beacon (BCN_ID) in message.
404, DM for subsequent use judges in Preset Time, whether receives the DM loss response message that other nodes return;
Wherein, described Preset Time can be called T2, and the T1 in the T2 here and 402 is that the return time interval based on relevant response message is set.If the DM of other nodes in territory in receiving 403 loses after Indication message, judge that it once received as the MissedBCN_ID of instruction in table 3 or certain beacon after it, can return to DM to DM for subsequent use and lose response message, carry the beacon identity receiving before it, the such as DetectedBCN_ID1 in table 4 etc.
In this step, if the judged result of DM for subsequent use is yes, has received the DM returning and lost response message, can judge accordingly that DM does not lose, DM for subsequent use does not do subsequent treatment; Otherwise, if the judged result of DM for subsequent use is no, in Preset Time, does not receive DM and lose response message, DM for subsequent use can judge that DM loses, and continues to carry out 405.
405, DM for subsequent use enables becomes new DM.
More than provide a kind of in the territory that is operated in asynchronous beacon patterns, DM for subsequent use judges the whether method of fault of DM, decided in its sole discretion by DM and BPR respectively owing to working in its beacon of territory of asynchronous beacon patterns or the transmitting time of R-beacon, transmitting time is fixing, and common DM for subsequent use cannot detect whether fault of DM reliably; And the above-mentioned determination methods of carrying by the embodiment of the present invention makes DM for subsequent use accurately judge DM state, improve DM for subsequent use and judged the reliability of DM state.
On this basis, describe again after DM fault and DM for subsequent use enable, node A in territory becomes concealed nodes with respect to DM for subsequent use, and its original BPR also DM relatively for subsequent use becomes in the situation of concealed nodes, the method for the oneself state that node A is performed and the judgement of network state and self-recovery.To be divided into as follows two kinds of situations and describe respectively the method: a kind of processing mode of the topology information deficiency that is node self, another kind will be the processing mode of node while having full topology information.
Embodiment tri-
Fig. 5 is the signalling diagram of the another embodiment of node restoration methods in power line communication of the present invention, the present embodiment for be the situation of node topology information deficiency, as shown in Figure 5, the method can comprise:
501, node A receives the beacon (Beacon) that DM sends, or, receive the R-beacon (R-beacon) that BPR sends;
Wherein, the DM in this time domain is working properly, does not also break down; If node A can with DM direct communication, can receive the beacon that DM sends, also may receive the R-beacon that other BPR send simultaneously, if node A is concealed nodes with respect to DM, node A can receive the R-beacon that BPR that DM specifies sends.
502, node A judges in Preset Time, whether to receive beacon indication information;
Wherein, described beacon indication information can comprise: the DM that the beacon that DM sends, the R-beacon that BPR sends and DM for subsequent use send loses indication information;
Described Preset Time is set on the basis of transmission time interval of considering above-mentioned beacon, R-beacon and DM loss indication information; For example, if node A is BPR, suppose this Preset Time to be called T4, this T4 can be set as BCNMaxT+T1+T2; If the node that node A is non-BPR is ordinary node, suppose this Preset Time to be called T5, this T5 can be set as BCNMaxT+2*T1+T2; Wherein, the setting to relevant Preset Time when described T1, T2 can judge DM state referring to front DM for subsequent use.
In the time that node A is receiving any one in above-mentioned beacon indication information, just can start timer, and judge whether again receive any one in beacon indication information at above-mentioned T4 or in the T5 time.In concrete enforcement, may comprise following several situation:
For example, if node A does not receive beacon or R-beacon at T4 or in the T5 time, but the correct DM that DM for subsequent use sends that detected loses indication information, node A can judge that DM fault may appear in the network of the current field accordingly, DM for subsequent use will become new DM, and this node A can also receive the information that DM for subsequent use sends; Node A will continue to wait for that DM switches, and DM for subsequent use becomes new DM.
Again for example, if node A does not receive beacon or R-beacon at T4 or in the T5 time, do not have the correct DM that DM for subsequent use sends that detects to lose indication information yet, do not receive any beacon indication information, this situation may be caused by many reasons: such as, if node A is non-concealed nodes with respect to DM, reason may be the DM fault in territory, and also fault of DM for subsequent use; Or, be the DM fault in territory, DM for subsequent use is normal, but node A is concealed nodes with respect to DM for subsequent use; Or the DM in territory is normal, but node A has become concealed nodes etc. with respect to DM.If node A is concealed nodes with respect to DM, reason may be the DM fault in territory, and DM for subsequent use is normal, but node A is concealed nodes with respect to DM for subsequent use; Or, the BPR fault of node A etc.
As the above analysis, if node A can receive next beacon indication information at T4 or in the T5 time, can not process; Otherwise, if node A does not receive any beacon indication information at T4 or in the T5 time, cause the reason of this situation may have multiple, node A still can not judge the oneself state (such as whether node A has become concealed nodes) of the network state that obtains in territory (such as whether fault of DM) and node A accordingly, and node A will continue to carry out 503.
503, node A broadcast transmission beacon re-transmission request message;
Wherein, the node A of the present embodiment is due to the topology information deficiency of self, thus can not know clearly the topological relation between each node in territory, node A will be in network this beacon re-transmission request message of broadcast transmission; This beacon re-transmission request message may be able to be received by DM or BPR.
The form of described beacon re-transmission request message can be referring to table 1, request type " ReqType " in table 1 is located to be set to node request type, to make the DM or the BPR that receive this beacon re-transmission request message can retransmit at beacon topological relation of the state, BPR and the DM for subsequent use that carry territory in response message etc.
504, node A receives the beacon returning and retransmits response message, and described beacon is retransmitted response message and carried territory state information;
Wherein, because node A in 503 has indicated it is node request at the request type of beacon re-transmission request message, the DM or the BPR that receive beacon re-transmission request message can retransmit in response message and carry territory state information, i.e. Domain Status in table 2 at the beacon returning.Certainly, in concrete enforcement, can be also that the form that beacon is retransmitted to response message is fixed, it is the form shown in table 2 that each beacon is retransmitted response message default setting.
505, node A carries out the judgement of territory state and node oneself state according to beacon repeating transmission response message;
Wherein, the beacon of node A in receiving 504 will judge territory state and node oneself state according to this response message after retransmitting response message; Described territory state refers to the normal or fault of DM etc., can retransmit the Domain Status that response message carries by beacon and determine; Described node oneself state refers to, whether node can receive beacon that DM for subsequent use sends or receive the R-beacon that comprises DM for subsequent use and send information by BPR, and the value that the node oneself state of the present embodiment can be retransmitted the N_BackDM that response message carries in conjunction with beacon is determined.Concrete, may comprise following situation:
For example, node A receives the beacon that DM or some BPR return and retransmits response message, and the Domain Status instruction DM in message is normal, and node A does not deal with this;
Again for example, the response message that node A receives some BPR (shows that node A DM relatively for subsequent use is concealed nodes, so can only receive the R-beacon of BPR), Domain Status in message is designated as DM fault, DM for subsequent use enable (this situation can by BPR by receive DM for subsequent use DM lose Indication message obtain, be that BPR receives DM loss Indication message, judge above-mentioned territory state); And, N_BackDM=0 in message, can confirm that this BPR can continue to send R-beacon, be that BPR is not non-concealed nodes with respect to DM for subsequent use, so node A also can receive R-beacon, node A can judge, can after DM for subsequent use has switched, receive R-beacon by existing BPR, node A does not need to process, and only need to wait for that DM for subsequent use and BPR send beacon or R-beacon.
Again for example, node A receives the response message of some BPR, and the Domain Status in message is designated as DM fault, and DM for subsequent use enables (this situation can be obtained by the DM loss Indication message that receives DM for subsequent use by BPR); And, N_BackDM=1 in message, can confirm that this BPR is concealed nodes with respect to DM for subsequent use, existing BPR can not send R-beacon, so node A can not receive R-beacon, node A can judge, can not receive R-beacon by existing BPR after DM for subsequent use has switched, and node A will continue to carry out 506.
Again for example, node A receives the response message of some BPR, and the Domain Status in message is designated as in processing; Can confirm that this BPR is also concealed nodes with respect to DM for subsequent use, simultaneously, this BPR is carrying out the node Recovery processing of this BPR self, the node here refers to described BPR and is also carrying out and Recovery processing process like node category-A, such as judging BPR oneself state and territory state, or BPR request via node application BPR etc.Node A need to continue to wait for preset time T 6, this T6 can specifically set according to actual conditions, if do not receiving that after T6 the node that BPR sends is successfully recovered Indication message, this node is successfully recovered indication information for example can be successfully recovered response for what BPR returned, or the R-beacon returning for BPR; Now, if node A is originally as BPR, carry out 506, if this ordinary node as non-BPR of node A is carried out the flow process that again networks.
In addition, if node A is sending after beacon re-transmission request message, do not receive any beacon and retransmit response message, will resend beacon re-transmission request message yet; For example, and node A also will judge that continuously which time sends beacon re-transmission request message, can set transmission times n<2, continue to retransmit, if n >=2, and node A is BPR, carries out 506, if n >=2, and node A is ordinary node, carries out the flow process that again networks.
Preferably, node A after broadcast transmission beacon re-transmission request message, can arrange preset time T 7 in 503; Because above-mentioned request message is broadcast transmission, node A likely receives multiple beacons and retransmits response message in T7, and after the T7 time arrives, node A comprehensively judges this multiple response messages.If there is the response message that is beneficial to node A fast processing in the plurality of response message, node A will process according to this response message.
Be exemplified below: suppose that node A has received 2 response messages (supposing it is the first response message and the second response message), the territory state of indicating in the first response message is wherein DM fault, DM for subsequent use enables and N_BackDM=0, its physical node of this situation A can not need to process accordingly, and the territory state of indicating in the second response message is in processing, the BPR that sends this response message is carrying out the node Recovery processing of self, and this situation node A needs to continue to wait for preset time T 6.Now, node A can comprehensively analyze the first above-mentioned response message and the second response message, and determines according to the first response message, does not process just passablely, need not wait for according to the second response message again, thereby accelerate the Recovery processing process of node A.
506, node A is to broadcast transmission requesting node application BPR message in territory;
Wherein, the node A of the present embodiment does not have enough topology informations, cannot directly determine via node in the network of territory and via node whether can with DM direct communication for subsequent use etc., so node A is to broadcast transmission requesting node application BPR message in territory; Judged whether to DM application BPR for subsequent use by the via node oneself that receives this message.
In the requesting node application BPR message (RelayBPR_REQ.req) that described node A sends, can comprise: device identification, the reason for claim etc. of node A.
507, via node, according to described request node application BPR message, applies to become the BPR of described node to described DM for subsequent use;
Wherein, via node is receiving after the requesting node application BPR message of node A transmission, to oneself judge whether that the condition of judgement can comprise: whether via node self possesses BPR ability, whether has the ability that sends R-beacon to DM application BPR for subsequent use; And whether the device resource of via node self is sufficient; Optionally, this via node whether can with DM direct communication for subsequent use etc.
If via node possesses BPR ability and device resource abundance, via node will be to DM(for subsequent use now, DM for subsequent use has been in fact new DM) send and apply to become BPR message (BPR_REQ.req), to apply to become the BPR of node A, the wherein said BPR of applying to become message can be to be directly sent to DM for subsequent use, if or described via node cannot with DM direct communication for subsequent use, by its BPR will described in apply to become BPR message and be sent to DM for subsequent use.This application becomes the device identification that can carry node A in BPR message, will serve the device identification of the concealed nodes (DM relatively for subsequent use is as concealed nodes) of (forwarding R-beacon to node) to inform this via node of DM for subsequent use, DM for subsequent use is learnt, node A DM relatively for subsequent use is concealed nodes, this via node will apply to become the BPR of this node A, be responsible for sending R-beacon to node A, to ensure that node A can obtain domain scheduling, control information.
508, DM for subsequent use sends specify message to via node, specifies via node to become BPR;
Wherein, DM for subsequent use applying to become after BPR message in receiving 507, specifies via node to become the BPR of node A the form of the appointment BPR message according to specifying in existing protocol.If there are multiple via nodes to send and apply to become BPR to DM for subsequent use, DM for subsequent use can select the via node of the application correspondence of receiving at first as BPR; For example, DM for subsequent use can also select the via node that optimal path is corresponding to become BPR, and optimal path can be the fastest path of transmission rate, or shortest path.
509, via node returns to BPR confirmation response to node A;
Wherein, via node is receiving after the specify message of DM transmission for subsequent use, learns designated BPR success, can return to BPR to node A and confirm response, informs that node A self has successfully been appointed as the BPR of node A.
Then, via node just can be carried out the function of BPR, send R-beacon to node A, can be referring to shown in 510 and 511, for example, DM for subsequent use starts to carry out the function of DM, in territory, send beacon, this beacon has comprised bandwidth, mode of operation, the information such as safe mode, the via node that becomes BPR is receiving after this beacon, can send R-beacon according to this Information generation R-beacon and to node A, so just guarantee that node A can receive R-beacon, the information that can receive in the beacon that DM for subsequent use sends (is above-mentioned bandwidth, the information such as mode of operation), ensure own normal work in territory.
It should be noted that, this step can be used as optional step, if via node application BPR success, this via node just becomes BPR, and node A just can directly receive R-beacon, now also can not need via node to return to this BPR and confirm response.
510, DM for subsequent use sends beacon (beacon) to via node;
511, via node sends R-beacon (R-beacon) to node A.
In addition, node A sends request after the limiting time (being called T7) after node application BPR message at node A: if still can not receive the BPR confirmation response that any via node sends, or do not receive any R-beacon, so, node A can resend requesting node application BPR message, and this process of retry N time (can be restricted to N=1), if still do not receive that BPR confirms response or R-beacon, node A carries out the flow process that again networks.
The node restoration methods of the present embodiment as shown in Figure 5 can see, when the DM fault in territory, when DM for subsequent use enables, node A may not receive beacon message again, because now node A and original BPR thereof become concealed nodes with respect to DM for subsequent use; But, node A is judging by active while learning above-mentioned state, via node in meeting active request territory applies to become BPR to DM for subsequent use, thereby guarantee normally to receive beacon message, return in time normal operating conditions, avoid node to re-start the search that networks, reduced node recovery latency.
Embodiment tetra-
Fig. 6 is the signalling diagram of the another embodiment of power line communication node restoration methods of the present invention, the present embodiment for be the situation that node has full topology information.The method of the present embodiment is with respect to difference embodiment illustrated in fig. 5, and node A has complete topology information, and node A can learn oneself state by analyzing topology information, such as, whether self is concealed nodes etc. with respect to DM for subsequent use; In fact node A can learn the topological relation between the each node in territory by analyzing topology information.
Concrete, as shown in Figure 6, for example, in 603, when node A does not receive any beacon indication information in Preset Time, will analyze self and preserve topology information, judge whether self is concealed nodes with respect to DM for subsequent use.If node A learns that self is concealed nodes with respect to DM for subsequent use, can judge whether can with the BPR of node A direct communication, and judge this BPR whether can with DM for subsequent use or other BPR direct communications etc.
For example, if node A judgement not with the BPR of node A direct communication, or do not have can with the BPR of DM for subsequent use or other BPR direct communications, node A can directly carry out the flow process that again networks.
Again for example, if node A judgement can with DM direct communication, or there is the BPR with node A and DM direct communication for subsequent use, be called adjacent BPR, node A can carry out 604, sends beacon re-transmission request message to DM or adjacent BPR clean culture or multicast (in the time having multiple BPR can multicast).Now, the beacon that node A can return according to DM in 605 or BPR is retransmitted response message, judges territory state (Domain Status):
If beacon is retransmitted in response message, DM is normal in territory state Domain Status instruction, and node A can not do subsequent treatment.
If the beacon that BPR returns is retransmitted in response message, territory state Domain Status instruction DM fault and DM for subsequent use enable, node A can analyze in conjunction with oneself next step processing of Determines of the BPR that obtains of topology information: if BPR DM relatively for subsequent use is non-concealed nodes, node A can judge that existing BPR can send R-beacon after DM for subsequent use carries out DM function, and node A only need to wait for; If BPR DM relatively for subsequent use be concealed nodes and do not have can direct communication other BPR, node A continues to carry out 607.
If the beacon that BPR returns is retransmitted in response message, territory state Domain Status is designated as in processing, can confirm that this BPR is carrying out this node and recovering, node only needs to continue after stand-by period T6, for example, if do not receive that the node that BPR sends is successfully recovered Indication message (be successfully recovered response or R-beacon), and node A is BPR, carries out 607, if node A is ordinary node, carry out the flow process that again networks.
Or node A does not receive beacon and retransmits response message, and node A is BPR, carries out 607, if node A is ordinary node, node A can carry out the flow process that again networks.
Can be obtained by above-mentioned, node A is by analyzing topology information, determine whether BPR is concealed nodes with respect to DM for subsequent use, optionally, the beacon returning at BPR is retransmitted in response message, also can carry N_BackDM, node A can adopt and mode identical in embodiment tri-, determines in conjunction with this N_BackDM whether BPR is concealed nodes with respect to DM for subsequent use.
In 607, node A is by analyzing topology information, if can determine that certain node is via node, and this via node and node A can direct communications and are had the path that arrives DM for subsequent use, and node A will be to this via node clean culture or multicast (in the time that definite multiple nodes are via node) requesting node application BPR message.
Via node is receiving after this requesting node application BPR message, whether applies for BPR to DM for subsequent use, judgment mode is also identical with embodiment tri-, such as whether possessing BPR ability, device resource etc. according to it by oneself determining.Wherein, via node can be learnt from the topological relation in territory by analyzing topology information, thereby learn that whether self can or determine the path of communicating by letter with DM for subsequent use with DM direct communication for subsequent use, communicates by letter with DM for subsequent use by other via nodes.
The present embodiment, can be in conjunction with referring to described in embodiment tri-to the step of not describing in Fig. 6.
Embodiment five
Fig. 7 is the structural representation of node embodiment of the present invention, this node is for example node A, this node can be carried out the method for any embodiment of the present invention, and as shown in Figure 7, this node can comprise: message processing unit 71, status determining unit 72 and application indicating member 73; Wherein,
Message processing unit 71, while being used for not receiving beacon indication information in Preset Time, act on behalf of BPR to beacon and send beacon re-transmission request message, and receive the beacon repeating transmission response message that described BPR returns, described beacon is retransmitted response message and is carried territory state information;
Status determining unit 72, for determining that according to described territory state information territory state is that DM fault and DM for subsequent use enable, and determines that described BPR is the concealed nodes of DM for subsequent use;
Application indicating member 73, for determining that in described status determining unit DM fault and DM for subsequent use enable, and determine when described BPR is the concealed nodes of DM for subsequent use, via node in territory sends request node application BPR message, the device identification that described request node application BPR message is carried described node, to make described via node according to described request node application BPR message, apply to become the BPR of described node corresponding to described device identification to described DM for subsequent use.
Further, message processing unit 71, specifically for beacon re-transmission request message described in broadcast transmission, or, broadcast transmission described request node application BPR message.
Further, status determining unit 72, specifically for analyzing the topology information of self, determines the BPR with described node direct communication; Also, for analyzing the topology information of self, determine the via node in territory, and described via node can be communicated by letter with described DM for subsequent use;
Message processing unit 71, specifically for send described beacon re-transmission request message to described BPR, or, send described request node application BPR message to described via node.
Embodiment six
Fig. 8 is the structural representation of the present invention DM embodiment for subsequent use, and this DM for subsequent use can carry out the method for any embodiment of the present invention, and as shown in Figure 8, this DM for subsequent use can comprise: application receiving element 81 and function designating unit 82; Wherein,
Application receiving element 81, what send for the via node of acceptance domain applies to become BPR message, described in apply to become BPR message and carry described via node by the device identification of the node of service; The described BPR of applying to become message is that described node is that DM fault and DM for subsequent use enable at definite territory state, and the BPR of described node indicates described via node to send while being the concealed nodes of DM for subsequent use;
Function designating unit 82, is used to specify the BPR of described via node as described node corresponding to described device identification.
Further, this DM for subsequent use can also comprise: beacon request unit 83 and loss indicating member 84; Wherein,
Beacon request unit 83, for do not receive beacon or R-beacon in Preset Time time, sends beacon re-transmission request message to DM or BPR, carries the beacon identity of request;
Lose indicating member 84, when do not receive beacon corresponding to described beacon identity in Preset Time when described beacon request unit, send DM loss Indication message to the BPR of described node.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, in the time carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (16)
1. a node restoration methods in power line communication, is characterized in that, comprising:
When node does not receive beacon indication information in Preset Time, act on behalf of BPR send beacon re-transmission request message to beacon, and receive the beacon repeating transmission response message that described BPR returns, described beacon is retransmitted response message and is carried territory state information;
Described node shows that in described territory state information territory state is that DM fault and DM for subsequent use enable, and, when described in described node determination, BPR is the concealed nodes of DM for subsequent use, via node in territory sends request node application BPR message, the device identification that described request node application BPR message is carried described node, to make described via node according to described request node application BPR message, apply to become the BPR of described node corresponding to described device identification to described DM for subsequent use.
2. node restoration methods in power line communication according to claim 1, it is characterized in that, described beacon indication information comprises: the DM that the beacon that DM sends, the R-beacon that BPR sends and DM for subsequent use send loses indication information, and it is that described DM for subsequent use sends in the time that definite DM loses that described DM loses indication information.
3. node restoration methods in power line communication according to claim 1 and 2, is characterized in that,
Described node is acted on behalf of BPR to beacon and is sent beacon re-transmission request message, comprising: described node broadcasts sends described beacon re-transmission request message;
Described via node in territory sends request node application BPR message, comprising: described node broadcasts sends described request node application BPR message.
4. node restoration methods in power line communication according to claim 1 and 2, is characterized in that,
Described node is acted on behalf of BPR to beacon and is sent beacon re-transmission request message, comprising: the topology information of described node analysis self, and determine and the described BPR of described node direct communication, and send described beacon re-transmission request message to described BPR;
Described via node in territory sends request node application BPR message, comprise: the topology information of described node analysis self, determine the via node in territory, and described via node can communicate by letter with described DM for subsequent use, send described request node application BPR message to described via node.
5. node restoration methods in power line communication according to claim 1 and 2, it is characterized in that, if described node is non-BPR node, described method also comprises: if the territory state information that described beacon repeating transmission response message carries shows that described BPR is just in Recovery processing, and do not receive yet described BPR through Preset Time and be successfully recovered indication information, described node is carried out the flow process that again networks.
6. node restoration methods in power line communication according to claim 3, it is characterized in that, if described node is non-BPR node, described method also comprises: if the territory state information that described beacon repeating transmission response message carries shows that described BPR is just in Recovery processing, and do not receive yet described BPR through Preset Time and be successfully recovered indication information, described node is carried out the flow process that again networks.
7. node restoration methods in power line communication according to claim 4, it is characterized in that, if described node is non-BPR node, described method also comprises: if the territory state information that described beacon repeating transmission response message carries shows that described BPR is just in Recovery processing, and do not receive yet described BPR through Preset Time and be successfully recovered indication information, described node is carried out the flow process that again networks.
8. a node restoration methods in power line communication, is characterized in that, comprising:
What via node in DM acceptance domain for subsequent use sent applies to become BPR message, described in apply to become BPR message and carry described via node by the device identification of the node of service; The described BPR of applying to become message is that described node is that DM fault and DM for subsequent use enable at definite territory state, and the BPR of described node indicates described via node to send while being the concealed nodes of DM for subsequent use;
Described DM for subsequent use specifies the BPR of described via node as described node corresponding to described device identification.
9. node restoration methods in power line communication according to claim 8, is characterized in that, before what via node in DM acceptance domain for subsequent use sent apply to become BPR message, also comprises:
Described DM for subsequent use sends DM to the BPR of described node and loses Indication message, to make described BPR in the time receiving the beacon re-transmission request message of described node, lose Indication message according to described DM, retransmit in response message at the beacon returning to described node that territory state information is set to DM fault and DM for subsequent use enables.
10. node restoration methods in power line communication according to claim 9, is characterized in that, before described DM for subsequent use sends DM loss Indication message to the BPR of described node, also comprises:
When described DM for subsequent use does not receive beacon or R-beacon in Preset Time, send beacon re-transmission request message to DM or BPR, carry the beacon identity of request;
If do not receive the beacon that described beacon identity is corresponding in Preset Time, described DM for subsequent use judges that DM loses, and carries out the step that the described transmission of the BPR to described node DM loses Indication message.
Node restoration methods in 11. power line communications according to claim 9, is characterized in that, after described DM for subsequent use sends DM loss Indication message to the BPR of described node, also comprises:
Lose response message if do not receive DM in Preset Time, described DM for subsequent use judges that DM loses, and described DM for subsequent use enables becomes new DM.
12. 1 kinds of nodes, is characterized in that, comprising:
Message processing unit, for do not receive beacon indication information in Preset Time time, acts on behalf of BPR to beacon and sends beacon re-transmission request message, and receives the beacon that described BPR returns and retransmit response message, and described beacon is retransmitted response message and carried territory state information;
Status determining unit, for determining that according to described territory state information territory state is that DM fault and DM for subsequent use enable, and determines that described BPR is the concealed nodes of DM for subsequent use;
Application indicating member, for determining that in described status determining unit DM fault and DM for subsequent use enable, and determine when described BPR is the concealed nodes of DM for subsequent use, via node in territory sends request node application BPR message, the device identification that described request node application BPR message is carried described node, to make described via node according to described request node application BPR message, apply to become the BPR of described node corresponding to described device identification to described DM for subsequent use.
13. nodes according to claim 12, is characterized in that,
Described message processing unit, specifically for beacon re-transmission request message described in broadcast transmission, or, broadcast transmission described request node application BPR message.
14. nodes according to claim 12, is characterized in that,
Described status determining unit, specifically for analyzing the topology information of self, determines the BPR with described node direct communication; Also, for analyzing the topology information of self, determine the via node in territory, and described via node can be communicated by letter with described DM for subsequent use;
Described message processing unit, specifically for send described beacon re-transmission request message to described BPR, or, send described request node application BPR message to described via node.
15. 1 kinds of primary domain controller DM for subsequent use, is characterized in that, comprising:
Application receiving element, what send for the via node of acceptance domain applies to become BPR message, described in apply to become BPR message and carry described via node by the device identification of the node of service; The described BPR of applying to become message is that described node is that DM fault and DM for subsequent use enable at definite territory state, and the BPR of described node indicates described via node to send while being the concealed nodes of DM for subsequent use;
Function designating unit, is used to specify the BPR of described via node as described node corresponding to described device identification.
16. primary domain controller DM for subsequent use according to claim 15, is characterized in that, also comprise:
Beacon request unit, for do not receive beacon or R-beacon in Preset Time time, sends beacon re-transmission request message to DM or BPR, carries the beacon identity of request;
Lose indicating member, when do not receive beacon corresponding to described beacon identity in Preset Time when described beacon request unit, send DM loss Indication message to the BPR of described node.
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| CN107294666B (en) * | 2017-06-02 | 2020-01-31 | 沈阳航空航天大学 | broadcast packet transmission flow and power control method applied to wireless ad hoc network |
| CN110912584B (en) * | 2019-12-03 | 2021-08-27 | 南京协胜智能科技有限公司 | Communication method of power carrier communication system |
| CN115914082A (en) * | 2021-09-29 | 2023-04-04 | 深圳绿米联创科技有限公司 | Data transmission method, system, node device, forwarding device and storage medium |
| CN118041398A (en) * | 2022-11-14 | 2024-05-14 | 华为技术有限公司 | Method and device for node access to network |
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| WO2010137669A1 (en) * | 2009-05-27 | 2010-12-02 | 京セラ株式会社 | Communication device and power line communication system |
| CN101938418A (en) * | 2010-09-01 | 2011-01-05 | 深圳市业通达实业有限公司 | Relaying method of power line communication network |
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| CN102904610A (en) | 2013-01-30 |
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