CN109194526B - Fault take-over method for realizing cluster group calling by group multi-homing - Google Patents
Fault take-over method for realizing cluster group calling by group multi-homing Download PDFInfo
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- CN109194526B CN109194526B CN201811215347.2A CN201811215347A CN109194526B CN 109194526 B CN109194526 B CN 109194526B CN 201811215347 A CN201811215347 A CN 201811215347A CN 109194526 B CN109194526 B CN 109194526B
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Abstract
The invention relates to a fault takeover method for realizing cluster group calling by group multi-homing. The method is characterized in that: the design method of the group multi-homing comprises the following steps: during network establishment, a plurality of home switch are appointed for a group, and static information and dynamic information of the group are stored in a plurality of home switch centers; when a group calling service comes, selecting one switching center from a plurality of home switching centers as group control exchange, and taking charge of distribution and speaking right management of the group calling service; when a switching center fails, other home switching centers belonging to the switched group can manage the traffic for this group. The invention adopts the idea of multi-homing of the group, so that the dynamic and static information of the talk group is synchronously stored in a plurality of nodes in the network, when a certain node fails, other nodes can take over the service immediately, the single-point failure is effectively solved, and the reliability of the group call service is improved.
Description
Technical Field
The invention relates to a fault takeover method for realizing cluster group calling by group multi-homing.
Background
With the development of cluster services, multi-switch networking is increasingly used in the existing network. In a multi-switch networking, if a certain switching center fails, and other switching centers can take over the services of the switching center, many problems need to be considered when fully taking over the services of the failed switching, such as: base station take over, home subscriber take over, call service take over. Since the group call service is the core service of trunking communication, a solution is provided for the fault takeover of the trunking group call service.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a technical scheme for realizing the fault takeover method of the cluster group call by group multi-homing.
The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that: the design method of the group multi-homing comprises the following steps: during network establishment, a plurality of home switch are appointed for a group, and static information and dynamic information of the group are stored in a plurality of home switch centers; when a group calling service comes, selecting one switching center from a plurality of home switching centers as group control switching, and taking charge of distribution and speaking right management of the group calling service; when a switching center fails, other home switching centers belonging to the switched group can manage the traffic for this group.
The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that the implementation of the group multi-homing comprises the following processes:
1) the group static information is sent to a plurality of exchanges;
2) routing of the visited to home switching;
3) synchronizing the group dynamic information;
4) paging of group calling;
5) collisions and late entry.
The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that the method for issuing the group static information to a plurality of exchanges is as follows:
the network management needs to support the configuration of a plurality of home switching centers for the call group, when the configuration information of the call group changes, the network management needs to push the plurality of home switching centers of the group, the pushing process needs to be reliable, if the message is lost, the network management needs to mark that the data of the switching centers are inconsistent, and means is provided to trigger the pushing process again subsequently; each switching center can also actively acquire all static information from the network manager in time, so that the static information of the call group is further ensured to be consistent between the network manager and the switch, and is kept consistent between the attribution switches.
The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that the method for designing the route from the visit exchange to the home exchange is as follows:
when the initiating exchange center receives the group attachment or group calling request, judging whether the call group belongs to the current exchange, if not, indicating that the call group belongs to the current exchange role, and routing the request to a certain home exchange; designing a destination number routing table, and inquiring the destination number routing table for the next hop according to the number of the call group by the visitor exchange, wherein the next hop designates a specific link; each switching center is positioned in the same multicast domain, finds neighbors by periodically sending hello messages, and establishes a point-to-point link between every two switching centers; according to the maximum matching principle, the same group number can be matched with a unique record in a destination number routing table, and the record indicates a link reaching the next hop.
The method is characterized in that the links are divided into a main link and a standby link, the main link is preferentially used, the standby link is used only when the main link fails, the main link and the standby link are respectively provided with two links, and the two links can be used in turn when available.
The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that the method for synchronizing the group dynamic information comprises the following steps:
the dynamic information of the talk group mainly refers to which mobile stations are attached to the group currently and which base stations of which switching centers the mobile stations are distributed on, the dynamic information of the talk group changes along with the group attachment/detachment process of the mobile stations, each group home switching center looks like that other switching centers form a VMSC list of the talk group, the VMSC list of the talk group is an important component of the dynamic information of the talk group, the VMSC list of the talk group is used for paging of cross-exchange group call service, and each group home switching center needs to be notified to other home switching centers when perceiving that the VMSC list maintained by the group home switching center changes.
The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that the paging method of the group calling comprises the following steps:
after selecting control exchange according to the routing strategy, namely a certain group home exchange, the control exchange initiates paging of group calling; paging of a group call is divided into two stages, the first stage is network paging from control exchange to participation exchange, and the second stage is air interface paging from exchange to a base station.
The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that the conflict and late entry method comprises the following steps:
two handsets simultaneously initiate calls from different home exchanges
The situation can trigger 'competition control exchange', two control exchanges can occur, at the moment, the MSC-ID needs to be compared, the larger control exchange is regarded as the control exchange, if the local MSC-ID is large, the message is ignored, the control exchange is continued, if the local MSC-ID is small, the opposite side is regarded as the control exchange, and the PMSC role is switched by the opposite side;
entering later: how late a subsequent participating exchange is entered
When a group call is established, no mobile station of a certain exchange is attached to the group or the exchange is not on-line at the moment, and a mobile station is attached to the group later; in the group attachment process, the update of the VMSC list is synchronized in the whole network, the control exchange of the current group call can immediately sense the change of the VMSC list, and when the next later time comes, the VMSC can be pulled into the group call or can immediately initiate a later time to enter at the moment;
entering later: how late a late home exchange is entered
When group calling is established, a certain home exchange is not on line, but the current CMSC has a complete GHMSC list, so that when the group calling enters operation later, group calling paging is sent to the subsequent home exchange, and the subsequent home exchange enters the group calling as a role participating in exchange.
Existing single-group home switching, in a multi-switch clustered system, can form a single point of failure.
The invention adopts the idea of multi-homing of the group, so that the dynamic and static information of the talk group is synchronously stored in a plurality of nodes in the network, when a certain node fails, other nodes can take over the service immediately, the single-point failure is effectively solved, and the reliability of the group call service is improved.
Drawings
FIG. 1 is a diagram illustrating the relationship between roles of a switching center;
fig. 2 is a schematic diagram of a paging process of a group call.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
in a multi-switching network, the subscription information of a call group is stored only in one switching center, that is, the group home switching of the group, and the other switching centers do not store the information of the group. When there is a user to attach the group under another switching center, the group attachment request needs to be sent to the group home switching center, and the group home switching center dynamically maintains the coverage of the group, and this other switching center is called "group visit switching". When a user initiates a group call aiming at the group, the exchange where the user is located is called as 'group initiation exchange', 'group initiation exchange' is not necessarily group affiliation exchange, and has no group information, the call request needs to be sent to a group affiliation exchange center firstly, then the group affiliation exchange center sends the group call request to each group visit exchange according to the group coverage maintained by the group affiliation exchange center, and the group visit exchange receives the group call request and then sends the group call request to a local base station to page the user attached to the group. The request/release/notification of speaking right in the group calling process is also uniformly controlled by group home switch, so in the group calling service process, the group home switch plays a role of uniform control, which is called as group control switch, and other switching centers are called as group participation switch.
It can be seen from the above multi-exchange group call principle that if the group home switching center fails, the group call service for the group is not available, the mobile station cannot implement the group attach request, and the group call request cannot be distributed to each visited exchange. To address this problem, a solution is proposed herein: group multihoming.
The design idea of group multi-homing is as follows: when building network, it can appoint several home exchange for some group, and the static information and dynamic information of group are stored in several home exchange centers; when a group calling service comes, selecting one switching center from a plurality of home switching centers as group control switching, and taking charge of distribution and speaking right management of the group calling service; thus, when a certain switching center fails, other home switching centers belonging to the group of the switch can manage the service aiming at the group; that is, as long as multiple home switching centers of a group do not fail at the same time, the traffic of the group is not affected, which is the principle of group multihoming, as shown in fig. 1.
The relationship between the various roles of the switching center is shown in the following table:
the specific implementation process of group multi-homing is as follows:
1) the group static information is sent to a plurality of exchanges;
2) routing of the visited to home switching;
3) synchronizing group dynamic information;
4) paging of group calling;
5) collisions and late entry.
The group static information is sent down to a plurality of exchanges:
the network management needs to support the configuration of a plurality of home switching centers for the call group, and when the configuration information of the call group changes (is added, deleted or modified), the network management needs to push the plurality of home switching centers of the group. This push process needs to be reliable, and if there is a message loss, the network manager needs to mark that there is data inconsistency in the switching center, and provide means to trigger the push process again later. Each switching center can also actively acquire all static information from the network manager at a proper time (for example, when daily zero traffic is small), so as to further ensure that the static information of the talkgroup is kept consistent between the network manager and the switching, and is kept consistent between the home switches. The network manager can provide a checking mechanism to check whether the static data in the switching center is consistent with the network manager.
Routing of visited to home switching:
when the initiating exchange center receives the group attachment or group calling request, it judges if the talk group belongs to the current exchange, if not, it shows that it is the visit exchange role, and it needs to route the request to some home exchange. A destination number routing table is designed, the visit exchange finds the next hop according to the destination number routing table inquired by the number of the call group, and the next hop designates a specific link. Each switching center is positioned in the same multicast domain, finds out neighbors by periodically sending hello messages, and establishes point-to-point links between every two switching centers.
The "destination number routing table" is designed as follows:
according to the maximum matching principle, the same group number can be matched to a unique record in a destination number routing table, and the record indicates a link reaching the next hop. The link is divided into an active link and a standby link, the active link is preferentially used, and the standby link is used only when the active link fails. The active link and the standby link can be respectively provided with 2 links, and the 2 links can be used by the flow in turn. The routing design can realize the fault takeover of 'group home switching', can realize load sharing, and is very simple and flexible.
Taking the MSC1 in fig. 1 as an example, through hello messages, the MSC1 can discover the MSC2/MSC3/MSC4 and establish a neighbor relation and a point-to-point link, where the MSC2 and the MSC3 are group home switches. If the group number is: 9018xxxx and 9019xxxx, the following routing data may be configured on the MSC 1:
when both MSC2 and MSC3 are operating normally, MSC1 routes the group number for the 9018xxxx range segment to MSC2 and the group number for the 9019xxxx range segment to MSC 3. If MSC2 fails, MSC1 discovers the link to MSC2 fails and MSC1 enables a backup link for the group number of the 9018xxxx range segment, which is routed to MSC 3. Group dynamic information synchronization:
the dynamic information of the talk group mainly refers to which mobile stations are currently attached to the group and which base stations of which switching centers the mobile stations are distributed at. The dynamic information of the talk group varies with the group attach/detach process of the handset. From the perspective of each group home switching center, the other switching centers form a VMSC list of the talkgroup. The VMSC list of the talk group is an important component of the dynamic information of the talk group. The VMSC list of the talk group is used for paging of the cross-exchange group call service. Each group home switching center needs to notify other home switching centers when sensing that the VMSC list maintained by the group home switching center changes.
For example, if there are 4 mobile stations (mobile station 1, mobile station 2, mobile station 3, mobile station 4) registered under 4 switching centers (MSC 1, MSC2, MSC3, MSC 4), and all of them are going to group G, the home switch of group G is MSC2 and MSC 3. The coverage of the group as seen by the MSC2 is: MSC1, MSC2, MSC3, MSC1 are unaware that there is a handset attached to the group under MSC 4. Similarly, MSC3 does not know that there is a handset attached to the group under MSC 1.
Synchronization opportunity:
1) when the VMSC list changes, synchronization is initiated to other HMSCs;
2) when a certain HMSC is sensed to be restarted successfully, synchronization is initiated to the HMSC;
3) and (optional) periodically sending the VMSC list to each HMSC of the group.
Paging of group calling:
with the static information issuing, dynamic information synchronization and routing strategy design, the group call establishment and control under the multi-homing scene are easy to realize. After selecting control exchange (a certain group home exchange) according to the routing strategy, the control exchange initiates paging of group calling. The paging of the group calling is divided into two stages, the first stage is network paging from control exchange to participation exchange, the second stage is air interface paging from exchange to a base station, only the first stage paging needs to be analyzed, and the second stage paging is unchanged. The main difference between the group call paging under the multi-homing scene and the common multi-exchange group call is as follows: the control exchange needs to have the other home exchanges also as participating exchanges. The specific paging procedure is shown in fig. 2.
Step 0: static information is already configured (MSC 2 and MSC3 are group home switches) and dynamic information is already synchronized, i.e., the VMSC lists have been obtained on MSC2 and MSC 3: MSC1+ MSC 4. The routing policy has been configured, i.e., on the MSC, the active link points to MSC2 and the standby link points to MSC 3.
Step 1: the MSC1 receives the base station group call request, and determines that it is the visited switch by analyzing the group number. The MSC2 is selected as the control switch by the destination number route analysis, and sends the initial group call request to the MSC 2.
Step 2: the MSC2, acting as a control switch, performs a three-way handshake with the originating switch indicating that a group call is established on MSC 1.
Step 3: MSC2 ensures that paging to all VMSCs (including MSC3 and MSC 4) is initiated after the group call setup on MSC1 is successful.
Conflict and late entry:
two handsets simultaneously initiate calls from different home exchanges
This situation may trigger a "competing control exchange" and two control exchanges may occur. The MSC-IDs need to be compared at this time, and the large one is taken as a control exchange. If the home MSC-ID is large, the message is ignored, i.e., continues as a control switch. If the local MSC-ID is small, the opposite side is regarded as control exchange, and the opposite side is switched to the PMSC role.
Entering later: how late a subsequent participating exchange is entered
When a group call is established, no mobile station is attached to the group for a certain exchange (or the exchange is not on-line at the time), and later mobile stations are attached to the group. In the group attachment process, the update of the VMSC list is synchronized in the whole network, the control exchange of the current group call can immediately sense the change of the VMSC list, and when the next later call is carried out, the VMSC can be pulled into the group call or can immediately initiate a later call.
Entering later: how late a late home exchange is entered
When a group call is established, a certain home switch is not on line, but the current CMSC has a complete GHMSC list, so that when the group call enters the operation later, the group call paging is sent to the subsequent home switch, and the subsequent home switch enters the group call as a role participating in the exchange (even if the MSC-ID is the largest in the whole network).
Terms and abbreviations:
interpretation of terms:
group affiliation exchange: switching center for storing group information including static subscription information and dynamic information
Group call exchange: not a group-home exchange, but with the user attached to the group under that exchange
Group control exchange: switching center responsible for call control in group call service process
Group participation exchange: in the process of group calling service, the switching center in charge of call control is not needed
Group-initiated switching: switching center of group calling initiator
Abbreviations:
MSC: mobile switching center, switching center for short
HMSC: home switching center
And (2) VMSC: visiting switching center
OMSC: originating switching centre, O for short
OCMSC: is not only an initiating switching center but also a controlling switching center, OC for short
CMSC: control switching centre, abbreviated as C
PMSC: participating switching centres, P for short
MSC-ID: switching center sign (Identification)
Claims (2)
1. The method for realizing the fault takeover of the cluster group calling by the group multi-homing is characterized in that: the design method of the group multi-homing comprises the following steps: when building network, appointing several home exchange centers for some group, and storing the static information and dynamic information of group on several home exchange centers; when a group calling service comes, selecting one switching center from a plurality of home switching centers as a group control switching center to be responsible for distribution and speaking right management of the group calling service; when a certain switching center fails, other home switching centers of a group that belongs to the switching center can manage services for the group;
the implementation of the group multihoming comprises the following procedures:
1) the group static information is sent to a plurality of switching centers, a network manager needs to support the configuration of a plurality of home switching centers for a call group, when the configuration information of the call group changes, the configuration information is added, deleted and modified, the network manager needs to push the plurality of home switching centers of the group, the pushing process needs to be reliable, if the information is lost, the network manager needs to mark that the data of the switching centers are inconsistent, and means are provided for triggering the pushing process again subsequently; each switching center can also actively acquire all static information from the network manager in time, so that the static information of the call group is further ensured to be consistent between the network manager and the switching center and between the home switching centers;
2) the routing design from the visit switching center to the home switching center, when the initiating switching center receives the group attachment or group calling request, judging whether the call group belongs to the current switching center, if not, indicating that the call group is in the role of the visit switching center, and needing to route the request to a certain home switching center; designing a destination number routing table, and inquiring the destination number routing table by the visit switching center according to the number of the call group to find out the next hop, wherein the next hop designates a specific link; each switching center is positioned in the same multicast domain, finds neighbors by periodically sending hello messages, and establishes a point-to-point link between every two switching centers; the same group number can be matched with a unique record in a destination number routing table according to the maximum matching principle, and the record indicates a link reaching the next hop;
3) the group dynamic information is synchronous, the dynamic information of the talk group mainly refers to which mobile stations are attached to the group and which base stations of which switching centers the mobile stations are distributed on, the dynamic information of the talk group changes along with the group attachment/detachment process of the mobile stations, each group home switching center looks like, other switching centers form a visited switching center VMSC list of the talk group, the visited switching center VMSC list of the talk group is an important component of the dynamic information of the talk group, the visited switching center VMSC list of the talk group is used for paging of group calling service of cross-switching centers, and each group home switching center needs to be notified to other home switching centers when sensing that the visited switching center VMSC list maintained by the group changes;
4) paging of group calling, after selecting control exchange center according to route strategy, namely a certain group attribution exchange center, the control exchange center initiates paging of group calling; the paging of the group calling is divided into two stages, the first stage is network paging from a control switching center to a participating switching center, and the second stage is air interface paging from the switching center to a base station;
5) collision and late entry, two handsets simultaneously initiate calls from different home switching centers:
the situation can trigger a 'competitive control switching center', two control switching centers can appear, the MSC-ID needs to be compared at the moment, the larger control switching center is used as the control switching center, if the local MSC-ID is large, the local MSC-ID is continuously used as the control switching center, if the local MSC-ID is small, the opposite side is considered as the control switching center, and the opposite side is switched to participate in the role of the switching center;
entering in a late stage: how late a later visiting switching centre enters
When a group call is established, a certain switching center does not have a mobile station attached to the group or the switching center is not on line at the moment, and then the mobile station is attached to the group; when a group is attached, the VMSC list of the visiting switching center is updated in the whole network synchronization, the control switching center of the current group call can immediately sense the change of the VMSC list of the visiting switching center, when the next time is late, the VMSC of the visiting switching center can be pulled into the group call, and the time can be immediately initiated to enter later;
entering later: how late the latter home switching center is entered: when group calling is established, a certain home exchange center is not on line, but the current control exchange center has a complete GHMSC list, so that when the group calling enters operation later, group calling paging is sent to the next home exchange center, and the next home exchange center enters the group calling as a role of participating in the exchange center.
2. The method according to claim 1, wherein the links are divided into a primary link and a backup link, the primary link is preferentially used, the backup link is used only when the primary link fails, the primary link and the backup link are respectively provided with two links, and both links are used in turn when available.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625293A (en) * | 2003-12-04 | 2005-06-08 | 华为技术有限公司 | Method for realizing group calling roaming of group service |
| CN1859767A (en) * | 2006-01-16 | 2006-11-08 | 华为技术有限公司 | Group Call system and its method |
| CN1859769A (en) * | 2006-01-26 | 2006-11-08 | 华为技术有限公司 | Group cal communication system and its method |
| CN101159757A (en) * | 2007-10-25 | 2008-04-09 | 中兴通讯股份有限公司 | Dual-home synchronous data transmission method |
| EP2003913A2 (en) * | 2006-03-31 | 2008-12-17 | Huawei Technologies Co., Ltd. | A call recovery method during the network failure and the system thereof |
-
2018
- 2018-10-18 CN CN201811215347.2A patent/CN109194526B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625293A (en) * | 2003-12-04 | 2005-06-08 | 华为技术有限公司 | Method for realizing group calling roaming of group service |
| CN1859767A (en) * | 2006-01-16 | 2006-11-08 | 华为技术有限公司 | Group Call system and its method |
| CN1859769A (en) * | 2006-01-26 | 2006-11-08 | 华为技术有限公司 | Group cal communication system and its method |
| EP2003913A2 (en) * | 2006-03-31 | 2008-12-17 | Huawei Technologies Co., Ltd. | A call recovery method during the network failure and the system thereof |
| CN101159757A (en) * | 2007-10-25 | 2008-04-09 | 中兴通讯股份有限公司 | Dual-home synchronous data transmission method |
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