Method for implementing dual-homing

• US 20070183347A1
• Filed: 02/22/2007
• Published: 08/09/2007
• Est. Priority Date: 08/29/2004
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhou, Weiqiang, Gu, Jiongjiong, Chen, Hanbing, Liu, Zhenhua, Zhong, Yong, Lin, Yong, Guo, Changcheng, Zhao, Chunhui, Cai, Yunxia
• Granted Patent: US 8,116,760 B2
• Time in Patent Office: Days
• US Class Current: 370/258
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 88/14 Backbone network devices

Abstract

The invention discloses a method for implementing dual-homing, including: setting each one of any two core control equipment as a standby for each other, connecting a network entity belonging to one of the core control equipment with the two core control equipment through a primary link and a standby link respectively; setting the primary link connected with the core control equipment as activated, and setting the standby link connected with the core control equipment inactive; determining whether the core control equipment corresponding to the primary link is out of service, if the core control equipment corresponding to the primary link is out of service, activating the standby link; otherwise, continuously determining whether the core control equipment corresponding to the primary link is out of service. The invention also discloses another method for implementing dual-homing, by which the reliability of the network can be improved.

Claims

1. A method for implementing dual-homing, comprising:

setting each one of any two pieces of core control equipment as a standby for the other core control equipment, and connecting a network entity belonging to one of the two core control equipment with the two core control equipment through a primary link and a standby link, respectively;

setting the primary link connected with the core control equipment as activated, and shutting down the standby link connected with the core control equipment;

determining whether the core control equipment corresponding to the primary link is out of service, if the core control equipment corresponding to the primary link is out of service, activating the standby link;

otherwise, and determining whether the core control equipment corresponding to the primary link is out of service.

2. The method according to claim 1, after determining the core control equipment corresponding to the primary link is out of service, the method further comprising:

determining whether the out-of-service core control equipment has recovered, if the out-of-service core control equipment has recovered, shutting down the standby link, and activating the primary link;

otherwise, making no processing.

3. The method according to claim 1, further comprising:

setting the primary link inactive while activating the standby link.

4. The method according to claim 1, further comprising:

setting a primary signaling point and a standby signaling point in each of the core control equipment with the mutually standby relationship, respectively, with the primary signaling point of one core control equipment corresponding to the standby signaling point of the other core control equipment; and

the step of activating the standby link when determining the core control equipment corresponding to the primary link has been out of service comprises, activating the standby signaling point and shutting down the primary signaling point while activating the standby link.

5. The method according to claim 2, further comprising:

setting a primary signaling point and a standby signaling point in each of the core control equipment with the mutually standby relationship, respectively, with the primary signaling point of one core control equipment corresponding to the standby signaling point of the other core control equipment;

the step of making the standby link inactive upon determining the out-of-service core control equipment has recovered comprises;

making the standby signaling point inactive and activating the primary signaling point while making the standby link inactive.

6. The method according to claim 1, wherein the core control equipment is a Mobile Switching Center (MSC) server;

and the network entity is any one of a Base Station Controller (BSC), a Radio Network Controller (RNC), a Home Location Register (HLR), a Public Switched Telephone Network (PSTN), a Service Control Point (SCP) and an MSC.

7. The method according to claim 1, wherein the core control equipment is the MSC server, the network entity is the BSC further comprising:

connecting the BSC with the two MSC servers through a Media gateway (MGW), respectively.

8. The method according to claim 7, wherein the MGW is configured with a signaling gateway;

the MSC server serves as an Application Service Point (ASP) associated with the signaling point of the signaling gateway through an agent or a relay mode through a message transfer part Layer 3 user adaptation.

9. The method according to claim 1, wherein the two pieces of core control equipment are softswitches;

and the network entity includes a media resource server, an application server, the PSTN, an integrated home location register, the SCP.

10. The method according to claim 1, wherein the core control equipment is a softswitch, the network entity is the PSTN, and the method further comprises:

connecting the PSTN with the two softswitches through the MGW, respectively.

11. The method according to claim 10, wherein the MGW is configured with the signaling gateway;

the softswitch serves as one ASP associated with the signaling point of the signaling gateway through an agent or a relay mode through the message transfer part Layer 3 user adaptation.

12. The method according to claim 1, wherein the network entity is a signaling gateway, the method further comprises:

setting a first Originating Point Code (OPC) in the first and second core control equipment with the mutually standby relationship respectively;

connecting all the signaling gateways that will interact with the first OPC to the first OPC of the first and the second core control equipment, respectively, and for each signaling gateway, setting the priority of the first connection that connects the signaling gateway with the first OPC of the first core control equipment higher than the priority of the second connection that connects the signaling gateway with the first OPC of the second core control equipment;

upon receiving a signaling message whose destination is the first OPC, each signaling gateway determining whether the first connection with the higher priority can be used or not, if the first connection with the higher priority can be used, performing the signaling interaction with the first OPC of the first core control equipment via the first connection;

otherwise, performing the signaling interaction with the first OPC of the second core control equipment via the second connection.

13. The method according to claim 12, further comprising:

setting a second OPC in the first and the second core control equipment with the mutually standby relationship, respectively, and setting the first and the second OPC of each core control equipment to be mutual-aid;

the first connection being a direct route between the signaling point of the signaling gateway and the first OPC of the first core control equipment;

the second connection being an indirect route between the signaling point of the signaling gateway and the first OPC of the second core control equipment via the transit of the second OPC of the second core control equipment.

14. The method according to claim 13, wherein the signaling interaction with the first OPC of the second core control equipment via the second connection comprises:

the signaling gateway sending uplink signaling messages to the second OPC of the second core control equipment via the indirect route with a lower priority;

the second OPC forwarding the uplink signaling messages to the first OPC of the second core control equipment;

the first OPC of the second core control equipment sending downlink signaling messages to the second OPC of the second core control equipment, the second OPC forwarding the downlink signaling messages to the signaling gateway.

15. The method according to claim 12, further comprising:

upon receiving the signaling messages from the first OPCs of the first and second core control equipment at the same time, the signaling gateway receiving the signaling message from the first connection with a higher priority, and discarding the signaling message from the second connection with a lower priority according to the priorities of the connections.

16. The method according to claim 1, wherein the two pieces of core control equipment are first core control equipment and second core control equipment, the method further comprises:

the first core control equipment obtaining data and state of the second core control equipment;

the first core control equipment processing services of the second core control equipment using the data of the second core control equipment according to the state of the second core control equipment.

17. The method according to claim 16, wherein the first core control equipment obtains the state of the second core control equipment via a handshake mechanism.

18. The method according to claim 16, wherein the state of the second core control equipment comprises a normal state and an out-of-service state;

and the step for the first core control equipment processing the services of the second core control equipment using the data of the second core control equipment according to the state of the second core control equipment further comprises;

when the second core control equipment is in the normal state, the first core control equipment obtaining the data of the second core control equipment;

when the second core control equipment is in the out-of-service state, the first core control equipment taking over the services of the second core control equipment according to the data of the second core control equipment.

19. The method according to claim 18, wherein

the step for the first core control equipment taking over the services of the second core control equipment according to the data of the second core control equipment comprises:

the first core control equipment setting up the services related with the second core control equipment according to the data of the second core control equipment;

operating the established services on the first core control equipment.

20. The method according to claim 18, wherein the step for the first core control equipment processing the services of the second core control equipment using the data of the second core control equipment according to the state of the second core control equipment further comprises:

when the second core control equipment shifts from the out-of-service state to the normal state, the first core control equipment returning the services of the second core control equipment to the second core control equipment.

21. The method according to claim 20, wherein the step for the first core control equipment returning the services of the second core control equipment to the second core control equipment further comprises:

the first core control equipment tearing down the services related with the second core control equipment according to the data of the second core control equipment;

the first core control equipment obtaining the data of the second core control equipment.

22. The method according to claim 16, further comprising:

leaving data with an identification of the other equipment unprocessed when the first core control equipment starting.

23. A method for implementing dual-homing, comprising:

setting each one of any two Media Gateway Control Function (MGCF) entities as a standby for the other MGCF, each MGCF managing at least one Media Gateway (MGW);

determining whether the MGW needs to register to a standby MGCF or not, if the MGW needs to register to the standby MGCF, upon detecting a new MGW registration, the standby MGCF activating or setting up all the signaling links related with the MGW, and refreshing the route information of the called party;

if the MGW doesn'"'"'t need to register to the standby MGCF, returning to the step of determining whether the MGW needs to register to the standby MGCF or not again.

24. The method according to claim 23, before the standby MGCF detecting the new MGW registration, further comprising:

a primary MGCF shutting down or blocking the signaling links related with the MGW requiring register again;

and, while the standby MGCF refreshing the route information of the called party, the primary MGCF refreshing the route information of the called party.

25. The method according to claim 24, wherein the step of refreshing the route information of the called party comprises:

the primary MGCF changing an intra-office call related with the re-registered MGW in the route information of the called party to an inter-office call;

the standby MGCF changing the call between the MGWs except the re-registered MGW and the re-registered MGW in the route information of the called party to an intra-office call.

26. The method according to claim 24, wherein the signaling links which are related with the MGW requiring register again and are shut down or blocked by the primary MGCF are the signaling link connections related with the MGW, or the signaling links only related with the MGW.

27. The method according to claim 23, wherein, the step for the standby MGCF activating or setting up all the signaling links related with the MGW when detecting a new MGW registration comprises:

for the links forwarded to the standby MGCF from other equipment, the standby MGCF activating or setting up the signaling links related with the MGW actively after the successful registration of an MGW control interface of the MGW.

28. The method according to claim 23, wherein, the step for the standby MGCF activating or setting up all the signaling links related with the MGW when detecting a new MGW registration, comprises:

for an inter-office signaling the standby MGCF directly interfacing with the outside, the standby MGCF opening the signaling links related with the MGW actively after the successful registration of an MGW control interface of the MGW.

29. The method according to claim 23, wherein the signaling links are the links forwarded to the standby MGCF from an MGW or a signaling gateway, the signaling link is any one of the following:

a message transfer part layer 2 user adaptation link, a message transfer part layer 3 user adaptation link, a link access protocol version-5 user adaptation link, an integrated services digital network Q.921 user adaptation link, a wireless access network application part link and a base station application part link.

30. The method according to claim 23, wherein the signaling links are the inter-office signaling that the MGCF directly interfaces with the outside;

the inter-office signaling is any one of bearer independent call control signaling, a session initiate protocol signaling or a No. 7 signaling.

31. The method according to claim 23, wherein each MGCF corresponds to a MGC;

and the method further comprises;

setting the MGWs to be managed by each MGC, configuring the MGC that manages the MGW as the home MGC of the MGW, and setting each of the two MGCs that manage different MGWs as the mutual-aid MGC for each other;

the MGW sending a heartbeat signal to the current home MGC periodically when in the normal working state, and detecting the heartbeat signal that the home MGC returns, if the home MGC returns a normal heartbeat signal, the MGW continuously sending the heartbeat signal to the current home MGC periodically when in the normal working state and detecting the heartbeat signal returned by the home MGC;

if the home MGC doesn'"'"'t return the normal heartbeat signal, initiating a dual-homing switch to the mutual-aid MGC of the home MGC, and setting the mutual-aid MGC as the current home MGC after the dual-homing switch, the MGW continuously sending the heartbeat signal to the current home MGC periodically when in the normal working state.

32. The method according to claim 31, further comprising:

each MGC setting up an MGW list when initializing, wherein the list is used for recording all the MGWs controlled by the MGC;

the dual-homing switch comprises;

the MGW requiring to carry out the dual-homing switch reporting a registration request to the destination MGC of this dual-homing switch;

upon receiving the registration request reported by the MGW, the destination MGC determining whether the MGW is in the MGW list established by itself, if the MGW is in the MGW list established by the MGC, accepting the registration request, and connecting with the MGW;

otherwise, rejecting the registration request.

33. The method according to claim 31, further comprising:

the MGC sending a heartbeat signal to its mutual-aid MGC as scheduled, and detecting the heartbeat signal sent by the mutual-aid MGC;

wherein

the MGC comprises two kinds of normal working state;

a mutual-aid non-activated state and a mutual-aid activated state;

upon detecting the heartbeat signal sent by the mutual-aid MGC is interrupted, the MGC in the mutual-aid non-activated state shifting to the mutual-aid activated state from the mutual-aid non-activated state;

upon detecting the heartbeat signal sent by the mutual-aid MGC sent is normal, the MGC in the mutual-aid activated state shifting to the mutual-aid non-activated state from the mutual-aid activated state;

34. The method according to claim 33, further comprising:

upon recovering from the out-of-service state, if detecting that the heartbeat signal sent by its mutual-aid MGC is normal, the MGC directly entering the mutual-aid non-activated state;

otherwise, directly entering the mutual-aid activated state.

35. The method according to claim 33, wherein the normal working state of the MGC further comprises:

an idle state under mutual-aid condition;

upon recovering from the out-of-service state, the MGC directly entering the idle state under mutual-aid condition;

the MGC in the idle state under mutual-aid condition shifting to the mutual-aid activated state or the mutual-aid non-activated state according to a control command for the state change which the system network management centre issues.

36. The method according to claim 33, further comprising:

setting the MGW managed by each MGC as a primary MGW, setting the MGW managed by the mutual-aid MGC thereof as a standby MGW; and

saving the setting result in a database of the system network management center which the MGC belongs to;

for each MGW, setting the MGC which manages the MGW as a primary MGC of the MGW, setting the mutual-aid MGC of the primary MGC as a standby MGC of the MGW; and

saving the setting result in a database of the MGW.

37. The method according to claim 36, wherein the MGC in the mutual-aid non-activated state further performs the following operations:

maintaining the established primary link connected with its own primary MGW, controlling the primary MGW through the primary link;

responding through the primary link the heartbeat signal which its own primary MGW sends periodically;

maintaining its own MGW list, and processing the registration request which the MGW reports according to the MGW list maintained by itself.

38. The method according to claim 36, wherein the MGC in the mutual-aid activated state further performs the following operations:

maintaining the established primary link connecting the MGC with its primary MGW and the established standby link connecting the MGC with its standby MGW, and controlling the primary MGW and the standby MGW through the primary link and the standby link respectively;

responding the heartbeat signal periodically which the primary MGW sends through the primary link, and responding the heartbeat signal periodically which the standby MGW sends through the standby link;

maintaining its own MGW list, and processing the register request which the MGW reports according to the MGW list maintained by itself.

39. The method according to claim 36, further comprising:

before shifting from the mutual-aid non-activated state to the mutual-aid activated state, the MGC reading the MGW information from the database of the system network management center, adding its standby MGWs to the MGW list controlled by itself.

40. The method according to claim 36, wherein, before shifting from the mutual-aid activated state to the mutual-aid non-activated state, the MGC further performs the following operations:

searching the MGW list maintained by itself, obtaining the standby MGW information from the MGW list through inquiring the database of the system network management centre;

sending a message of quitting a service to the standby MGW, informing the standby MGW that the MGC no longer provides the service, and commanding the standby MGW disconnect the standby link immediately;

shutting down the communication port connected with the standby MGW, and disconnecting the standby link;

deleting all the standby MGW information from the MGW list maintained by the MGC.

41. The method according to claim 36, further comprising:

before shifting from an out-of-service state or an idle state under mutual-aid condition to the mutual-aid non-activated state, the MGC reading the MGW information from the database of the system network management center, adding its primary MGW to the MGW list maintained by the MGC itself;

before shifting from the out-of-service state or the idle state under mutual-aid condition to the mutual-aid activated state, the MGC reading the MGW information from the database of the system network management center, adding its primary MGW and standby MGW to the list of the MGW maintained by the MGC itself.

42. The method according to claim 36, after the MGW switching to the standby MGC, further comprising:

the MGW sending the heartbeat signal to its primary MGC periodically, and detecting the heartbeat signal returned from the primary MGC, once the heartbeat signal returned from the primary MGC is normal, setting the primary MGC as the current home MGC of the MGW, and initiating the switching from the standby MGC to the primary MGC.

43. The method according to claim 31, further comprising:

setting a threshold for the detection of the broken heartbeat signal;

the normal heartbeat signals returned by the home MGC comprises;

the heartbeat signals continuously returned by the home MGC or the interrupt time of the returned heartbeat signals is smaller than the set threshold for the detection of the broken heartbeat signal.

44. The method according to claim 23, wherein the two Media Gateway Control Function (MGCF) entities are first core control equipment and second core control equipment, the method further comprises:

the first core control equipment obtaining the data and the state of the second core control equipment;

the first core control equipment processing services of the second core control equipment using the data of the second core control equipment according to the state of the second core control equipment.

45. The method according to claim 44, wherein the first core control equipment obtains the state of the second core control equipment via a handshake mechanism.

46. The method according to claim 44, wherein the state of the second core control equipment comprises the normal state and the out-of-service state;

and the step for the first core control equipment processing services of the second core control equipment using the data of the second core control equipment according to the state of the second core control equipment further comprises;

when the second core control equipment is in the normal state, the first core control equipment obtaining the data of the second core control equipment;

when the second core control equipment is in the out-of-service state, the step further comprising;

the first core control equipment taking over services of the second core control equipment according to the data of the second core control equipment.

47. The method according to claim 46, wherein the step for the first core control equipment taking over services of the second core control equipment according to the data of the second core control equipment further comprises:

the first core control equipment setting up the services related with the second core control equipment according to the data of the second core control equipment;

operating the established services on the first core control equipment.

48. The method according to claim 46, wherein, when the second core control equipment shifts from the out-of-service state to the normal state, the step for the first core control equipment processing services of the second core control equipment using the data of the second core control equipment according to the state of the second core control equipment further comprises:

the first core control equipment returning services of the second core control equipment to the second core control equipment.

49. The method according to claim 48, wherein the step for the first core control equipment returning services of the second core control equipment to the second core control equipment further comprises:

the first core control equipment tearing down services related with the second core control equipment according to the data of the second core control equipment;

the first core control equipment obtaining the data of the second core control equipment.

50. The method according to claim 44, further comprising:

leaving data with an identification of the other equipment unprocessed when the first core control equipment starting.

51. A piece of home equipment in dual-homing, comprising:

a data obtaining unit, connecting with a mutual-aid equipment of the home equipment and a data storage unit, being used for obtaining data of the mutual-aid equipment, and storing obtained data to the data storage unit;

the data storage unit being used for saving the data obtained by the data obtaining unit from the mutual-aid equipment;

a heartbeat signal detection unit connecting with the mutual-aid equipment, a service switchover unit and a service tear down control unit, being used for detecting state of the mutual-aid equipment, and notifying the detected state of the mutual-aid equipment to the service switchover control unit and the service tear down control unit;

the service switchover control unit connecting with the heartbeat signal detection unit and the data storage unit, being used for adopting the mutual-aid equipment'"'"'s data saved in the data storage unit to take over a service of the mutual-aid equipment and control equipment originally controlled by the mutual-aid equipment, when the heartbeat signal detection unit detecting that the state of the mutual-aid equipment is invalid;

the service tear down control unit being connected with the heartbeat signal detection unit and the data storage unit, being used for adopting the mutual-aid equipment'"'"'s data saved in the data storage unit to tear down the service taken over from the mutual-aid equipment and give the service back to the mutual-aid equipment, when the heartbeat signal detection unit detecting that the state of the mutual-aid equipment is changed from an invalid state to a normal state.

52. The equipment according to claim 51, wherein, the home equipment further comprises a list to record all the equipment controlled by the home equipment, and

the home equipment is further used for determining whether controlled equipment sending a registration request is in the list, when receiving the registration request for initiating a dual-homing switching from the controlled equipment, if the controlled equipment sending the registration request is in the list, the home equipment accepts the registration request and connects with the controlled equipment;

otherwise, the home equipment rejects the registration request.

53. The equipment according to claim 51, wherein the home equipment is further used for sending a normal heartbeat signal to the mutual-aid equipment and the controlled equipment of the home equipment if the home equipment is in the normal state.

54. The equipment according to claim 51, wherein the home equipment is further used for determining that the mutual-aid equipment is in the invalid state, if the home equipment does not receive the heartbeat signal from the mutual-aid equipment within a pre-defined time, or interrupt time of the returned heartbeat signal from the mutual-aid equipment is larger than a set threshold;

after determining the mutual-aid equipment is in the invalid state, the home equipment is further used for changing from a mutual-aid non-activated state to a mutual-aid activated state, adding the controlled equipment of the mutual-aid equipment to the list maintained by the home equipment, initiatively establishing a connection to the controlled equipment originally under control of the mutual-aid equipment and taking over the controlled equipment.

55. The equipment according to claim 51, wherein the home equipment is further used for determining the mutual-aid equipment changes from the invalid state to the normal state, when detecting the heartbeat signal from the mutual-aid equipment is normal;

after determining the mutual-aid device changes from the invalid state to the normal state, the home equipment is further used for deleting the controlled equipment originally under control of the mutual-aid equipment from its list, notifying the controlled equipment that no service will be provided and disconnecting the connection to the controlled equipment.

56. A piece of controlled equipment in dual-homing, wherein the controlled equipment is used for sending a heartbeat signal to its home equipment periodically in a normal state, detecting a returned heartbeat signal from its home equipment;

the controlled equipment is further used for sending the heartbeat signal to the home equipment periodically if receiving a normal heartbeat signal returned from the home equipment;

the controlled equipment is further used for initiating a dual-homing switch to mutual-aid equipment of its home equipment, taking the mutual-aid equipment of its home equipment as its new home equipment, and sending the heartbeat signal to the new home equipment, if the controlled equipment does not receive a normal heartbeat signal from the home equipment within a pre-defined time, or interrupt time of the returned heartbeat signal from the home equipment is larger than a set threshold.

57. The equipment according to claim 56, wherein the controlled equipment is further used for setting the home equipment controlling it as first home equipment, sets the mutual-aid equipment of the home equipment as second home equipment, and saving a setting result in a database maintained by the controlled equipment.

58. The equipment according to claim 56, wherein the controlled equipment is further used for reporting a registration request to the second home equipment when determining to initiate the dual-homing switch.

59. A system for implementing dual-homing, comprising:

first home equipment and second home equipment, which are set as a standby for each other;

a piece of controlled equipment belonging to the first home equipment or the second home equipment, setting its home equipment as primary home equipment, setting mutual-aid equipment of its home equipment as standby home equipment, connecting the primary home equipment and the standby home equipment with a primary link and a standby link respectively, if the primary home equipment is in a normal state, the primary link being activated and the standby link being inactive;

if the primary equipment is in an invalid state, the standby link being activated and the primary link being inactive.

60. The system according to claim 59, wherein,

a first Originating Point Code (OPC) is set in the first home equipment and the second home equipment respectively;

the controlled equipment that will interact with the first OPC is connected with the first home equipment and the second home equipment, priority of the primary link connecting the controlled equipment with the first OPC of the first home equipment is higher than the priority of the standby link connecting the controlled equipment with the first OPC of the second home equipment;

the controlled equipment is used for determining whether the primary link with the higher priority can be used or not when receiving a signaling message whose destination is the first OPC;

the controlled equipment is further used for performing a signaling interaction with the first OPC of the first home equipment via the primary link, if the primary link with the higher priority can be used;

the controlled equipment is further used for performing a signaling interaction with the first OPC of the second home equipment via the standby link, if the primary link with the higher priority cannot be used.

61. The system according to claim 59, wherein

a second OPC is set in the first home equipment and the second home equipment respectively, the second OPC and the first OPC set in each home equipment are set as a standby for each other;

the primary link connecting a signaling point of the controlled equipment with the first OPC of the first home equipment is a direct route;

the standby link connecting the signaling point of the controlled equipment with the first OPC of the second home equipment is an indirect route passing the second OPC of the second home equipment.

62. The system according to claim 59, wherein the controlled equipment is used for performing the signaling interaction with the first OPC of the second home equipment through the standby link, when the primary link cannot be used or the first home equipment is in the invalid state;

the controlled equipment is further used for sending an uplink signaling message to the second OPC of the second home equipment via the indirect route with a lower priority, when the primary link cannot be used or the first home equipment is in the invalid state; and

the second OPC of the second home equipment is used for forwarding the uplink signaling message(s) received from the controlled equipment to

the first OPC of the second home equipment;

the first OPC of the second home equipment is used for sending a downlink signaling message to the second OPC of the second home equipment, when the primary link cannot be used or the first home equipment is in the invalid state, and the second OPC of the second home equipment is further used for forwarding the downlink signaling message(s) to the controlled equipment.

63. The system according to claim 59, wherein the first home equipment is used for obtaining data and state of the second home equipment, processing a service of the second home equipment using the data of the second home equipment according to the state of the second home equipment.

64. The system according to claim 59, wherein the state of the second home equipment comprises the normal state and the invalid state;

and

the first home equipment is used for obtaining the data of the second home equipment when the second home equipment is in the normal state; and

the first home equipment is further used for taking over the service(s) of the second home equipment according to the data of the second home equipment when the second home equipment is in the invalid state.

65. The system according to claim 59, wherein the first home equipment is further used for tearing down the service(s) related with the second home equipment according to the data of the second home equipment, when the state of the second home equipment shifting from the invalid state to the normal state;

and

the second home equipment is used for obtaining the controlled equipment and data which are controlled by itself in the normal state.

66. The system according to claim 59, wherein when the state of the second home equipment shifting from the invalid state to the normal state, the first home equipment is further used for continuously controlling service(s) of the second home equipment until the state of the first home equipment changes to the invalid state, and

when the state of the first home equipment changing to the invalid state, the second home equipment is further used for taking over all the service(s) controlled by the first home equipment in the normal state, which comprise the service(s) belonging to the first home equipment and the service(s) taken over from the second home equipment.