WO2013091468A1

WO2013091468A1 - Processing method and cco in power line communication network

Info

Publication number: WO2013091468A1
Application number: PCT/CN2012/085437
Authority: WO
Inventors: 姜彤; 刘培
Original assignee: 华为技术有限公司
Priority date: 2011-12-21
Filing date: 2012-11-28
Publication date: 2013-06-27
Also published as: CN102571151B; CN102571151A

Abstract

Disclosed are a processing method and a central coordinator (CCo) in a power line communication network. The method comprises: a CCo detecting the state of a proxy coordinator (PCo), the state of the PCo comprising PCo normal or PCo offline; and the CCo assigning a new PCo to a hidden station corresponding to the offline PCo after determining that the PCo is offline. The embodiments of the present invention can ensure that the service of the hidden station is not interrupted as far as possible after the PCo is offline.

Description

Processing method and CCo in power line communication network

This application is submitted to the Chinese Patent Office on December 21, 2011, and the application number is

The title of the invention is the priority of the Chinese patent application, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a processing method in a power line communication network and a Central Coordinator (CCo). BACKGROUND OF THE INVENTION Power Line Communication (PLC) loads a high frequency signal carrying information onto a power line and transmits data using a power line. The home broadband PLC network is a PLC-based network. Each home broadband PLC logical network has a CCo. The central coordinator can manage the entire network, such as coordinating the transmission of sites in the network and authenticating the sites that newly join the network. Manage encryption keys and share resources with neighboring networks. In the home broadband PLC logical network, due to channel conditions or other factors, some stations may not be able to hear messages such as beacons sent by the CCo, that is, there are hidden sites (Hidden Stations, HSTAs). In order to allow hidden sites to access the network, CCo will assign a Proxy Coordinator (PCo) to the hidden site, and PCo can forward management messages and broadcast proxy beacons for hidden sites.

In actual application, the PCo may be disconnected due to the user unintentionally pulling the PCo out of the socket or the PCo failure. At this time, for the hidden site, there may be insufficient scheduling information to enable the service transmission. Interrupted, quality of service (QoS) cannot be guaranteed. For the application scenario of audio and video transmission in the home broadband PLC logic network, when the PCo is dropped, it will have a serious impact on the transmission effect.

In the prior art, after the PCo is disconnected, the hidden site corresponding to the PCo may find that the proxy beacon from the PCo cannot be detected. After the hidden station terminates the scheduling information obtained by the previous proxy beacon, it selects another PCo or selects a Proxy Station (PSTA) to re-associate with the CCo. The CCo will find that the Terminal Equipment Identifier (TEI) of the device that sent the re-association message is different from the TEI of the PCo originally specified for this hidden site, and then assigns a new PCo to the hidden site. However, since the hidden site in the prior art is re-associated with the CCo after the obtained scheduling information is terminated, the CCo determines the new PCo after the judgment. Since re-association will cause a large delay, in the process of re-association, the hidden site may not have corresponding scheduling information, which may cause service interruption. For the transmission of audio and video services, QoS cannot be guaranteed. May cause business disruption.

SUMMARY OF THE INVENTION Embodiments of the present invention provide a processing method and a CCo in a power line communication network, which are used to solve the problem that the PCo cannot be found in the prior art, and realize the timely discovery of the PCo drop, and try to ensure hidden sites. The business is transmitted continuously.

An embodiment of the present invention provides a processing method in a power line communication network, including:

The CCo detects the status of the PCo, and the status of the PCo includes: PCo is normal or the PCo is dropped; the CCo specifies a new PCo for the hidden site corresponding to the dropped PCo after determining that the PCo is dropped.

An embodiment of the present invention provides a CCo, including:

a detecting module, configured to detect a status of the PCo, where the status of the PCo includes: the PCo is normal or the PCo is dropped;

And a designated module, configured to: after the detecting module determines that the PCo is disconnected, specify a new PCo for the hidden site corresponding to the dropped PCo.

According to the foregoing technical solution, the CCo directly detects the state of the PCo by using the CCo, and specifies a new PCo after the PCo is disconnected, which can avoid the large delay caused by the re-association of the hidden site, and can avoid service interruption and improve QoS as much as possible. . BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. Obviously, the drawings in the following description are some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative labor.

1 is a schematic flow chart of an embodiment of a processing method in a power line communication network according to the present invention; 2 is a schematic diagram of a protocol layer architecture of an HPAV system according to an embodiment of the present invention;

3 is a schematic structural diagram of a beacon period in an embodiment of the present invention;

4 is a schematic diagram of an exemplary power line communication logic network in an embodiment of the present invention;

FIG. 5 is a schematic flowchart of specifying a PCo according to an embodiment of the present invention.

FIG. 6 is a schematic flowchart of an embodiment of determining a state of a PCo according to an embodiment of the present invention; FIG. 7 is a schematic flowchart of another embodiment of determining a state of a PCo according to an embodiment of the present invention; A schematic flowchart of another embodiment of the state of PCo; FIG. 9 is a schematic structural view of an embodiment of a CCo of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a schematic flowchart of an embodiment of a method for processing a power line communication network according to the present invention. FIG. 2 is a schematic diagram of a protocol layer architecture of a HomePlug AV (HPAV) system based on an embodiment of the present invention.

Referring to Figure 2, the HPAV network is a centralized management network. Each network has a CCo. In addition to being a normal PLC device, the central coordinator is responsible for the management of the entire network, including network establishment, site access and authorization, and Bandwidth allocation and resource scheduling of the network, coordination with multiple neighboring networks, network power management, and the like.

The data plane provides traditional layered access, including the Ml interface between the Convergence Layer (CL) and the Media Access Control (MAC) layer, and the PHY interface between the MAC layer and the physical layer. On the control side, unlike traditional tiering, the control plane provides more efficient processing techniques and greater flexibility to control connection establishment and teardown, channel estimation, bridging, etc. through the Connection Management (CM).

Site-to-site connections in HPAV networks are established between high-level entities. Each connection has an associated Connection Specification (CSPEC), and each C SPEC contains Connect the required QoS. After the high-level entity requests to establish a connection, the CM allocates a Connection Identifier (CID), and also establishes several links and specifies a Link Identifier (LID) according to the CSPEC provided by the high-level entity. There are two types of links: global links and local links. The global link is requested by the CM to the CCo, and the CCo allocates a Global Link Identifier (GLID) and a Code Time Division Multiple Access (TDMA) for the global link; The Local Link Identifier (LLID) is assigned by the originating site when the connection is established.

The HPAV network uses a beacon-based channel access mechanism with a beacon period that is twice the period of the AC cycle. There are three types of beacons: central beacon, discovery beacon, and proxy beacon. The central beacon is sent by the CCo in each beacon period. The main function is to carry channel allocation information and scheduling information, which is used for coordination between sites in the network and coordination with adjacent networks. Discovery beacons are periodically sent by the discovered and authorized site devices in the "discovery process" for obtaining network topologies, and other sites can update the list of discovered sites they maintain by discovering beacons and The network list has been discovered; in addition, the hidden station can be made aware of the beacon period structure by detecting the discovery beacons of other stations and associated with the CCo to access the network. The proxy beacon is sent by the Proxy Coordinator (PCo) during each beacon period to provide timing and scheduling information for the hidden site.

3 is a schematic structural diagram of a beacon period according to an embodiment of the present invention. Referring to FIG. 3, the beacon period is twice the period of the alternating current cycle, and the beacon region is used to transmit the central beacon, and the central beacon can be used. Carrying scheduling information, which may be persistent scheduling, may be valid for a specified number of consecutive beacon periods, or for non-persistent scheduling, and is valid only in the current beacon period. The Carrier Sense Multiple Access (CSMA) area is used for CSMA access. Reserved Area can be used for TDMA service allocation or CSMA service allocation. In addition, the CCo can assign a GLID to each PCo and allocate a transmission time slot for the PCo in the reserved area, and the PCo can broadcast the proxy beacon in the corresponding transmission time slot. When there are multiple PCos, the CCo allocates different transmission slots for each PCo.

Under the above architecture, referring to FIG. 1, this embodiment includes:

Step 11: The CCo detects the status of the PCo, and the status of the PCo includes: the PCo is normal or the PCo is offline;

Step 12: After determining that the PCo is offline, the CCo assigns a new PCo to the hidden site corresponding to the dropped PCo. Specifically, for PCo, if it is normal, the proxy beacon is broadcasted during the beacon period. If the CCo does not receive the proxy beacon of the PCo within a certain beacon period, the PCo may be dropped; or, The PCo normally broadcasts the proxy beacon, but the CCo did not receive it due to channel conditions and the like. Therefore, when the CCo does not receive the proxy beacon of one or some PCo broadcasts within a certain beacon period, further measures can be taken to determine whether the PCo or the PCo has been dropped. The specific measures may be to use only the broadcast mode, only the unicast mode, or the combination of the broadcast mode and the unicast mode. For details, please refer to the subsequent embodiments.

After determining that PCo is offline, CCo can select a new PCo according to the topology table for the hidden site corresponding to the dropped PCo, and then specify it.

For example, referring to FIG. 4, FIG. 4 is a schematic diagram of an exemplary power line communication logical network in which an embodiment H (STAH) is a CCo, and a site D (STAD) and a site E (STAE) are hidden sites. You can choose PCo for hidden sites as follows:

The CCo in each network saves a topology table, which stores a list of discovered sites and a list of discovered networks for each site, as shown in Table 1. CCo can determine the hidden sites, select the most suitable PCo, establish a proxy network, etc. according to the topology table.

Table 1 Associated and Authorized Sites Discovered Site Lists Discovered Network Lists

MAC address ( H / CCo ) {MAC address ( A ) ( B ) ( C ) { empty }

(F) (G) }

MAC address ( A ) {MAC address ( H / CCo ) ( B ) { empty }

(C) (E) (F) }

MAC address ( B ) {MAC address ( A ) ( D ) ( C ) { empty }

( H/CCo ) (E) }

MAC address ( C ) {MAC address ( A ) ( B ) ( C ) { empty }

(D) (G) ( H/CCo ) }

MAC address ( D ) {MAC address (BXCXFXE)} {empty}

MAC address ( E ) {MAC address ( A ) ( B ) ( D ) } {empty} MAC address ( F ) {MAC address ( A ) ( H / CCo ) { empty }

( G ) }

MAC address (G) {MAC address (C) (F) {empty}

( H/CCo ) }

CCo can identify the sites it shares by comparing the list of discovered sites with its own and hidden sites, and use the site's ability to act as a PCo to determine the most appropriate PCo. For example, see Table 1, CCo's discovered sites include: A, B, C, F, G, hidden sites D discovered sites include: B, C, F, E, hidden site E discovered sites include: A , B, D, for hidden site D, PC-capable sites can be selected as PCo of D in B, C, F. For hidden site E, PCo-capable sites can be selected in A and B. As PCo of E, if Site B has the ability to act as a PCo, the CCo can select Site B as the PCo of Site D and Site E.

In addition, the above topology table can also be used as a basis for CCo to discover hidden sites. For example, if there is no site in the discovered site of CCo, and the site is found in the discovered sites of other sites, the site is a hidden site for CCo. .

Further, the above manner of selecting PCo can be applied to the initial selection and the reselection, and the hidden site corresponding to PCo can be determined according to the result of the initial selection. For example, CCo initially determines Site D, Site E is a hidden site, and PCo selected for Site D and Site E is Site B, then the hidden sites corresponding to PCo (that is, Site B) are Site D and Site E. After that, when Site B is offline, you can still reselect PCo in the above way.

After the PCo is selected, the following method can be used for designation. Referring to FIG. 5, FIG. 5 is a schematic flowchart of specifying a PCo in the embodiment of the present invention, including:

Step 51: The CCo sends a proxy designation request message to the new PCo.

The proxy designation request (CP_PROXY_APPOINT.REQ) message includes a ReqType field, and the value of the ReqType field is Add, meaning that a new PCo is specified.

Step 52: After the new PCo determines to accept the proxy role according to its own situation, it sends a proxy designation confirmation message to the CCo.

The agent specifies that the (CP_PROXY-APPOINT. CNF) message informs CCo that the agent role has been accepted.

Step 53: The new PCo sends a proxy designation notification message to the hidden site; Wherein, the proxy designation notification (PH_PROXY_APPOINT.IND) message informs the hidden site that this PCo is responsible for acting as its proxy coordinator.

In this embodiment, the state of the PCo is directly detected by the CCo, and a new PCo is specified after the PCo is dropped, so that the delay caused by the re-association of the hidden site can be avoided, and service interruption and QoS can be avoided as much as possible.

FIG. 6 is a schematic flowchart of an embodiment of determining a state of a PCo according to an embodiment of the present invention. The embodiment is determined in a unicast manner. Referring to FIG. 6, this embodiment includes:

Step 61: The CCo sends a unicast message to the first PCo.

Wherein, if the CCo does not receive the proxy beacon of one or some PCo broadcasts within a certain beacon period, the PCo or PCo is the first PCo mentioned above.

In addition, the unicast message may be a CP_PROXY_APPOINT.REQ message, which is different from the existing CP PROXY APPOINT.REQ message, and the value of the ReqType of the CP_PROXY_APPOINT.REQ message in this embodiment is selected. It is 0x04 and is newly added. Table 2 gives a schematic of the CP-PROXY-APPOINT.REQ message:

Table 2 Field Byte Field Length Definition

Serial number (bytes)

ReqType 0 1 request type

ReqID 1 1 Request ID

GLID 2 1 GLID

Number of HSTAs provided by Num HSTA 3 1 (=N)

0x00 = no HSTA

0x01 = Provide an HSTA message, push j3⁄4

HSTA SA[1] 4-9 6 MAC address of the first HSTA

HSTA TEI[1] 10 1 TEI of the first HSTA

HSTA STATE[1] 11 1 Status of the first HSTA

HSTA SA[N] - 6 Last HSTA MAC address HSTA TEI[N] - 1 TEI of the last HSTA

HSTA STATE [N] - 1 Status of the last HSTA Table 3 is a schematic diagram of the ReqType field:

Different from the prior art, the value of ReqType in the prior art is only 0x00 to 0x03, and the rest is reserved, and a value for interrogation is added in this embodiment, which is represented by 0x04.

In addition, the meaning of HSTA STATE in Table 2 can be seen in Table 4:

Table 4

Step 62: The first PCo responds or does not respond according to its own situation.

Specifically, if the first PCo is normal, the response message corresponding to the unicast message is sent to the CCo, such as If the first PCo is dropped, no response is made.

The response message of the unicast message may be CP_PROXY_APPOINT.CNF, and the format of the response message may be as shown in Table 5:

table 5

Different from the prior art, the value of the Result field in the prior art is only 0x00 and 0x01, and the rest is reserved. In this embodiment, a value corresponding to the query is added, which is represented by 0x02.

Step 63: If the CCo does not receive the response message corresponding to the unicast message within the preset time, the CCo resends the unicast message until the response message is received, or reaches a preset number of times, and the number of times the unicast message is sent reaches the preset After the number of times is set and the response message is not received, it is determined that the first PCo is dropped.

The preset time and the preset number of times may be set according to actual conditions. In addition, if it is determined based on only one unicast situation, the above-mentioned preset number of times can be understood as one time.

It should be noted that, the foregoing first PCo may be one or at least two, and the device that is dropped is usually one, and one is taken as an example. For example, if the dropped PCo is the site A, the device A is sent to the site A. Broadcast the message, and resend the unicast message after receiving the response message from the site A. If the number of retries of the unicast message reaches the set number of times and still does not receive the response message from the site A, the site A is dropped. .

Certainly, the foregoing first PCo may also be at least two, for example, including the site A and the site B. Then, the CCo sends a unicast message to the site A and the site B respectively. If the response message of the site A is received within the number of retries, If the response message of the site B is not received, it indicates that the site A is normal and the site B is offline. If the response message of the site B is received within the number of retries, and the response message of the site A is not received, the site B is normal. Site A is dropped. If no response is received from Site A and Site B within the number of retries. The information indicates that both Site A and Site B are dropped. If both Site A and Site B receive response messages within the number of retries, Site A and Site B are both normal. The processing flow of the first PCo for the remaining number can be referred to for execution.

Optionally, the foregoing unicast message and the response message are obtained by extending an existing message, and may also perform a unicast inquiry by using the added message. For example, the above unicast message is CP INQUIRE.REQ, the response message is CP_INQUIRE.RSP, and CP_INQUIRE.REQ, and CP_INQUIRE.RSP are new messages.

The format of the CP_INQUIRE.REQ message can be seen in Table 6. The format of the CP_INQUIRE.RSP message can be seen in Table 7:

Table 6

This embodiment may add a field value or add a unicast message to an existing unicast message. The CCo determines the status of the PCo, and then discovers that the PCo is dropped in time to ensure that the service is not interrupted.

FIG. 7 is a schematic flowchart of another embodiment of determining a state of a PCo according to an embodiment of the present invention, where the embodiment is determined by a broadcast manner. Referring to FIG. 7, this embodiment includes

Step 71: The CCo sends a broadcast message to the entire network, where the broadcast message includes the information of the first PCo. If the CCo does not receive the proxy beacon of some or some PCo broadcasts within a certain beacon period, then the CCo Or these PCo are the first PCo mentioned above.

This broadcast message is a new message and can be called a "CM_EVALUATE.REQ" message.

The format of the CM-EVALUATE.REQ message is shown in Table 8:

Table 8

The above fields PCo TEI[1] to PCo TEI[N] are the information of the first PCo.

The meaning of ReqType can be as shown in Table 9:

Table 9

ReqType value definition 0x00 Request each station to send whether to hear the proxy beacon of PCo, used for judging

Whether PCo is offline. After receiving the CM_DETECT.REQ of ReqType=0x00, each STA responds if it is PCo itself; if it is another STA, if it detects the proxy beacon of PCo in the message list in this cycle, it responds; otherwise, Not responding

OxOl-OxFF Reserved Step 72: The site in the entire network responds or does not respond according to its own situation.

For any one of the first PCo, if it is normal, it responds, the response message contains its own information, or, if it is normal and receives the proxy beacon of the remaining first PCo broadcast in the current beacon period, In response, the response message contains its own information and information of the first PCo that received the proxy beacon.

For any station other than the first PCo, that is, the non-first PCo, if it receives the PCo indicated by the information of the PCo contained in the CM_EVALUATE.REQ message during the beacon period, that is, the first PCo The proxy beacon then responds, and the response message contains the information of the first PCo that received the proxy beacon, otherwise it does not respond.

The above response message can be called CM-EVALUATE.RSP message, and the message format can be as shown in Table 10:

Table 10 Field Byte Field Length Definition

Serial number (bytes)

TEI 1 1 TEI of the response site

Short network ID for SNID 2 4bits response site

RSVD 2 4bits reserved

Num PCo 3 1 Site (STA) detects the number of PCos in the PCo list in the REQ message that sent the beacon during this beacon period

0x00 = no PCo

0x01 = - a PCo proxy beacon was not received, to Such push

PCo TEI[1] 2 1 TEI of the first PCo that received the proxy beacon

- -

PCo TEI[N] - 1 TEI of the Nth PCo receiving the proxy beacon. Step 73: The first PCo that CCo will not receive the corresponding response message within the set time is determined to be the dropped PCo.

Wherein, after the broadcast process, information of some or some first PCo may be included in the response message, and the proxy beacon of the PCo or the PCo may not be heard by the CCo, which may be poor channel condition or sudden noise interference. For example, the first PCo includes the site A and the site B. After the broadcast process, a site receives the proxy beacon of the site B in the beacon period, and the site sends a response message including the information of the site B to the CCo. After receiving the response message, the CCo may determine that the site B is normal. If no site sends a response message containing the information of the site A, that is, the response message of the corresponding site A is not received, the CCo determines the site A. Dropped.

Further, this embodiment may also be similar to the processing of the unicast message, and may resend the broadcast message. If no response message corresponding to the first PCo is received within a preset number of times, the corresponding first A PCo dropped.

In this embodiment, the information of the first PCo is carried in the broadcast message, and the entire website is processed according to its own situation, so that the state of the PCo can be determined by the CCo, and then the PCo is found to be dropped in time to ensure the uninterrupted service as much as possible. In this embodiment, the reliability of the PCo state judgment can be improved by the broadcast mode.

The above describes the unicast mode and the broadcast mode respectively, and may also combine the two. In this case, it may be broadcast first and then unicast, or may be unicast and broadcast again. Specifically, it is as shown in the following examples.

FIG. 8 is a schematic flowchart of another embodiment of determining a state of a PCo according to an embodiment of the present invention. This embodiment takes broadcast and unicast as an example. Referring to FIG. 8, this embodiment includes:

Step 81: The CCo sends a broadcast message to the entire network, where the broadcast message includes the information of the first PCo. Step 82: The site in the entire network responds or does not respond according to its own situation.

The contents of steps 81-82 can be specifically referred to the contents of steps 71-72.

Step 83: The CCo sends a unicast message to the second PCo.

The second PCo is the first PCo that does not receive the corresponding response message after the broadcast process. In the example of the above embodiment, the site B is the second PCo. Of course, the number of the second PCo may also be multiple.

Step 84: The second PCo responds or does not respond according to its own situation.

Step 85: If the CCo does not receive the response message corresponding to the unicast message within the preset time, the CCo resends the unicast message until the response message is received, or reaches a preset number of times, and the number of times the unicast message is sent reaches the preset number. After the number of times is set and the response message is not received, it is determined that the second PCo is dropped.

The processing flow of the second PCo in the above steps 83-85 can be referred to the processing flow of the first PCo in steps 61-63.

Optionally, the unicast message used in this embodiment may be a message after adding a new field value, and may be a new message, such as two forms of messages used in the embodiment shown in FIG. 6.

Optionally, the unicast message used in this embodiment may be the same as the above broadcast message. That is, the unicast message will contain all the information of the first PCo. Or, further, the unicast message uses the field of the broadcast message but only the information of all the second PCo. Or, further, the unicast message uses the field of the broadcast message but only the information of the PCo corresponding to itself. For example, the first PCo includes the site A, the site B, and the site C. The second PCo includes the site A and the site B. The unicast messages sent to the site VIII and the site B may include the information of the site A and the site B. And the information of the site C may also include the information of the site A and the information of the site B, or the unicast message sent to the site A may only include the information of the site A, and the unicast message sent to the site B. Contains only information for Site B.

Optionally, the foregoing is a method of first broadcasting and then unicasting, or may be a method of first broadcasting and then broadcasting. At this time, the third PCo may be determined by using a unicast method. The third PCo refers to the first PCo that does not receive the response message after the unicast process. For example, the first PCo includes the site A and the site B, and the unicast is performed. After the process, after receiving the response message of the site B and not receiving the response message of the site A, the third PCo is the site A. After that, the processing flow similar to the steps 71-73 is different, that is, the information carried in the broadcast message at this time is at least the information of the third PCo, for example, only the information of the third PCo, and may also be the information of the first PCo, The PCo that does not have a corresponding response message in the third PCo is determined to be the dropped PCo. Further, the type of the unicast message used at this time can also be referred to the unicast message type used in the above broadcast first unicast.

In this embodiment, the combination of broadcast and unicast can further improve the accuracy of detection, and then timely discover that PCo is dropped to ensure uninterrupted service.

FIG. 9 is a schematic structural diagram of an embodiment of a CCo according to the present invention, including a detection module 91 and a designated module. The detecting module 91 is configured to detect the state of the PCo, and the state of the PCo includes: the PCo is normal or the PCo is dropped; the specifying module 92 is configured to: after the detecting module 91 determines that the PCo is dropped, the PCo corresponding to the dropped line Hide the site to specify a new PCo.

Optionally, the detecting module is specifically configured to: send a unicast message to the first PC, where the CCo does not receive the proxy beacon broadcast by the first PCo within one beacon period; Receiving the response message from the first PCo, resending the unicast message until receiving the response message or reaching a preset number of times; the number of times the unicast message is sent reaches a preset number of times and is not received After responding to the message, it is determined that the first PCo is dropped.

Optionally, the detecting module is specifically configured to: send a preset number of broadcast messages to the entire network, where the broadcast message includes information of the first PCo, where the CCo does not receive the first time in a beacon period. a proxy beacon of a PCo broadcast; the response message from the first PCo is not received within the set time and the set number of times, and the response message from the non-first PCo is not received, then the first PCo is determined For the dropped PCo, the non-first PCo sends a response message to the CCo if it receives the proxy beacon broadcast by the first PCo within the beacon period.

Optionally, the detecting module is specifically configured to: send a broadcast message to the entire network, where the broadcast message includes information of the first PCo, where the CCo does not receive the first PCo within one beacon period. The PCo of the broadcast proxy beacon; when neither the response message of the first PCo nor the response message from the non-first PCo is received within the set time, the unicast message is sent to the first PCo, where The first PCo sends a response message to the CCo if the proxy beacon of the first PCo broadcast is received within the beacon period; if the response message of the first PCo is not received within a preset time, the first PCo retransmits the The unicast message is received until the response message is received or the preset number of times is reached. After the number of times the unicast message is sent reaches a preset number of times and no response message is received, it is determined that the first PCo is dropped. Further, the first PCo receiving the unicast message may be a complete set or a subset of the first PCo corresponding to the information of the first PCo included in the broadcast message. For example, the broadcast message contains the information of Site A and Site B. After the broadcast process, Site A may feedback the response information, and then only the unicast message may be sent to Site B instead of to Site A.

Optionally, the detecting module is specifically configured to: send a unicast message to the first PC, where the CCo does not receive the proxy beacon broadcast by the first PCo within one beacon period; Receiving the response message from the first PCo, resending the unicast message until receiving the response message or reaching a preset number of times; the number of times the unicast message is sent reaches a preset number of times and no response message is received. Afterwards, the broadcast message is sent to the entire network, where the broadcast message includes at least the information of the first PCo; neither the response message of the first PCo nor the response message of the non-first PCo is received within the set time. The first PCo is determined to be dropped, wherein the non-first PCo sends a response message to the CCo if the proxy beacon of the first PCo broadcast is received within the beacon period. Further, the first PCo corresponding to the information of the first PCo included in the broadcast message may be a complete set or a subset of the first PCo that receives the unicast message. For example, first, a unicast message is sent to the site A and the site B. After the unicast process, the site A may feedback the response information, and then the site B information may be included in the broadcast message instead of the site A. information.

Optionally, the specifying module is specifically configured to: select a new PCo for the hidden station according to the topology table; send a proxy designation request message to the new PCo; and receive the new PCo to send after receiving the proxy role The proxy specifies a confirmation message.

The above unicast message may be a message including an extension field or a new message.

In this embodiment, the state of the PCo is directly detected by the CCo, and a new PCo is specified after the PCo is disconnected, which can avoid the large delay caused by the re-association of the hidden site, and can avoid service interruption and improve QoS as much as possible.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A processing method in a power line communication network, comprising:

The central coordinator CCo detects the status of the agent coordinator PCo, and the status of the PCo includes: PCo is normal or PCo is dropped;

After determining that PCo is offline, CCo assigns a new PCo to the hidden site corresponding to the dropped PCo.

2. The method according to claim 1, wherein the detecting the state of the PCo by the CCo comprises:

The CCo sends a unicast message to the first PCo, where the CCo does not receive the proxy beacon of the first PCo broadcast within one beacon period;

If the CCo does not receive the response message from the first PCo within the preset time, retransmit the unicast message until the response message is received or reaches a preset number of times;

After the number of times the unicast message is sent reaches the preset number of times and the response message is not received, the CCo determines that the first PCo is dropped.

The method according to claim 1, wherein the detecting the state of the PCo by the CCo comprises:

The CCo sends a preset number of broadcast messages to the entire network, where the broadcast message includes information of the first PCo, where the CCo does not receive the proxy beacon of the first PCo broadcast within one beacon period; if the CCo is If the response message from the first PCo is not received within the set time and the set number of times, and the response message from the non-first PCo is not received, the first PCo is determined to be dropped, wherein, the non-first PCo A response message is sent to the CCo if a proxy beacon of the first PCo broadcast is received within the beacon period.

The CCo sends a broadcast message to the entire network, where the broadcast message includes the information of the first PCo, where the CCo does not receive the proxy beacon of the first PCo broadcast in one beacon period;

If the CCo does not receive the response message of the first PCo and does not receive the response message from the non-first PCo within the set time, the CCo sends a unicast message to the first PCo, where the non-first PCo Receiving the proxy beacon of the first PCo broadcast in the beacon period, sending a response message to the CCo; if the CCo does not receive the response message of the first PCo within the preset time, resending the ticket Broadcast the message until it receives the response message or reaches the preset number of times;

If the CCo does not receive the response message from the first PCo within the preset time, the unicast message is resent until the response message is received or the preset number of times is reached;

After the number of times the unicast message is sent reaches the preset number of times and the response message is not received, the CCo sends a broadcast message to the entire network, where the broadcast message includes at least the information of the first PCo.

If the CCo does not receive the response message of the first PCo and does not receive the response message from the non-first PCo within the set time, the first PCo is determined to be dropped, where the non-first PCo is in the The proxy beacon received by the first PCo during the beacon period sends a response message to the CCo.

The method according to any one of claims 1-5, wherein the designating a new PCo for the hidden site corresponding to the dropped PCo comprises:

Selecting a new PCo for the hidden site according to the topology table;

Sending a proxy designation request message to the new PCo;

Receiving a proxy designation confirmation message sent by the new PCo after accepting the proxy role.

The method according to claim 2, 4 or 5, wherein the unicast message is a message including an extension field or a new message.

8. A central coordinator CCo, comprising:

a detecting module, configured to detect a status of the agent coordinator PCo, where the status of the PCo includes: PCo is normal or PCo is dropped;

The CCo according to claim 8, wherein the detecting module is specifically configured to: send a unicast message to the first PCo, where the CCo does not receive the first PCo broadcast in one beacon period. Proxy beacon;

Resending the single message if the response message from the first PCo is not received within a preset time Broadcast the message until it receives the response message or reaches the preset number of times;

After the number of times the unicast message is sent reaches a preset number of times and no response message is received, it is determined that the first PCo is dropped.

The CCo according to claim 8, wherein the detecting module is configured to: send a preset number of broadcast messages to the entire network, where the broadcast message includes information of the first PCo, where The CCo does not receive the proxy beacon of the first PCo broadcast within one beacon period;

If the response message from the first PCo is not received within the set time and the set number of times, and the response message from the non-first PCo is not received, the first PCo is determined as the dropped PCo, where The non-first PCo sends a response message to the CCo if it receives the proxy beacon of the first PCo broadcast within the beacon period.

The CCo according to claim 8, wherein the detecting module is specifically configured to: send a broadcast message to the entire network, where the broadcast message includes information of the first PCo, where

The CCo does not receive the PCo of the proxy beacon of the first PCo broadcast within a beacon period;

When the response message of the first PCo is not received, and the response message from the non-first PCo is not received, the unicast message is sent to the first PCo, where the non-first PCo is in the Receiving the proxy beacon of the first PCo broadcast in the beacon period, sending a response message to the CCo;

If the response message of the first PCo is not received within the preset time, the unicast message is resent until the response message is received or the preset number of times is reached;

If the response message from the first PCo is not received within the preset time, the unicast message is resent until the response message is received or the preset number of times is reached;

After the number of times the unicast message is sent reaches a preset number of times and the response message is not received, the broadcast message is sent to the entire network, where the broadcast message includes at least the information of the first PCo.

If the response message of the first PCo is not received, and the response message from the non-first PCo is not received, the first PCo is determined to be dropped, wherein the non-first PCo is in the The proxy beacon received by the first PCo during the beacon period sends a response message to the CCo.

The CCo according to any one of claims 8 to 12, wherein the specifying module is specifically for:

Selecting a new PCo for the hidden site according to the topology table;

Sending a proxy designation request message to the new PCo;