EP1452046A1 - Routing method - Google Patents
Routing methodInfo
- Publication number
- EP1452046A1 EP1452046A1 EP02804155A EP02804155A EP1452046A1 EP 1452046 A1 EP1452046 A1 EP 1452046A1 EP 02804155 A EP02804155 A EP 02804155A EP 02804155 A EP02804155 A EP 02804155A EP 1452046 A1 EP1452046 A1 EP 1452046A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signaling
- switching center
- virtual networks
- network
- exchange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0025—Provisions for signalling
Definitions
- the present invention relates to a method for switching messages between virtual networks in a telecommunications network, and a switching center suitable for the method.
- Signaling system 7 Signaling System No 7, SS7
- SS7 Signaling System No 7, SS7
- the basis of the architecture of the signaling system 7 is the message transfer part (MTP). It establishes a connection between two neighboring signaling points and ensures the fail-safe transmission of the control information between them.
- MTP message transfer part
- Various user parts are set up on the message transmission part, which establish virtual “end-to-end” connections between the originating switching center and the target switching center.
- Telecommunications networks consist of a large number of switching centers (nodes).
- information or signaling can be transmitted between the switching centers in parallel (associated) or separately (quasi-associated) with the actual user data, essentially between devices from which signaling originates or ends (signaling end point, SEP) and devices which are used to connect signaling endpoints (signaling transfer points, STP and signaling lines).
- Each signaling point such as A switching center (node) is uniquely identified in the network by its own signaling point code (SPC).
- SPC signaling point code
- the exchanges forward incoming messages using routing tables in which all possible destination signaling points and the signaling paths to be used are entered.
- the network transitions (e.g. for STP traffic) between two virtual networks must be handled as if the networks in question were physically separate. This can be achieved in that the signaling and possibly also the connection is carried out via a transit exchange, or in that the signaling transfer point STP in question returns the signaling to itself via an external signaling loop (hardware loop).
- Additional hardware e.g. PCM system
- PCM system PCM system
- the object on which the invention is based is to specify a switching center or a switching method with which a communication link between virtual networks can be created without using an external signaling loop.
- Signaling connections between virtual networks in a switching center in which virtual networks coexist are thus set up by means of an internal signaling loop.
- Internal signaling loop means that in the exchange on the second and third levels of the message transmission part of the exchange between the virtual networks, a logical connection is established on the first level of the message transmission part of the exchange, but no physical connection. There will be none for the connection additional hardware needed per virtual network more.
- the signaling traffic to the other switching center can be divided between the signaling connections by means of the internal signaling loop and the bandwidth can be increased if necessary.
- FIG. 2 shows an example of a connection between two subscribers of a switching center, which belong to different virtual networks, according to the invention
- Fig. 4 virtual networks in a network section.
- each signaling point is uniquely identified by, for example, a 14 bit long signaling rungsigeco 'de marked.
- Each message contains both the signaling point code of the originating point code (OPC) and the destination signaling point (Destination Point Code, DPC).
- OPC originating point code
- DPC Destination Point Code
- Fig. 4 shows a network section in which in some exchanges 1..6 virtual networks, as described in DE 19930116 AI, are set up.
- Virtual networks Nl, N2 are only set up in exchanges 1 and 3 with the same signaling point code (SPC) in the external network with the network indicator NATO, while in exchanges 2, 4, 5, 6 only one network (NATO) is set up.
- SPC signaling point code
- NATO only one network
- the exchanges 1..6 are connected to network-specific link sets LS. From the outside, all linksets LS are assigned to the NATO network. From the point of view of exchanges 1 and 3, however, the individual link sets LS are assigned to virtual networks. That the linksets LSla..LSlc are assigned to the network N1 and the linksets LS2a..LS2e to the network N2. The linksets LSlc for the network N1 and LS2c for the network N2 exist between the exchanges 1 and 3 within the external network NATO.
- an internal network number (network ID) is assigned to each virtual network N1, N2.
- Each message arriving from outside in one of the virtual networks N1 and N2 in the switching points 1, 3 is linked to the respective internal network number.
- a signaling message sent from the outside to the switching center 1 via the linkset LSla is linked to the internal network number of the network N1 in the switching center 1 in order to set up a call to a subscriber at the switching center 3. This can be done, for example, by an input interface of the switching center 1 inserting the network identifier in a header of a signaling data block.
- the switching center 1 uses the identifier to select the signaling point code SPC that is used for the relaying of the message and recognizes, for example, that the message must be relayed to the switching center 3.
- the exchange 1 selects the linkset LSlc for this forwarding, which is also assigned to the network identifier of the network Nl.
- Each exchange 1..6 has a signaling point code that only needs to be unique within its network.
- the individual switching centers 1..6 of a virtual network N1, N2 can only establish a connection with one another by means of those switching centers 1..6 that are assigned to their network identifier.
- FIG. 2 shows a network NATO, in which the operators A, B, C, D and E share the switching center 1.
- Each of the virtual networks N1..N5 is managed independently and independently by the telecommunications provider A..D without influencing the other virtual networks.
- Operator B and operator E agree that subscribers X and Y of their network N5 and N2 may each communicate with each other.
- a network transition for signaling is set up in the switching center 1 by an internal signaling loop S between the two separate SS7 networks N2 and N5 and a communication link T (trunk) for voice transmission between the local exchanges LE X and LE Y of the subscribers X, Y is set up ,
- the appropriate SS7 routing data (route, route set, link, link set, etc.) are set up in the switching center 1 for the correct handling of the SS7 messages in the message transmission part MTP.
- Fig. 1 shows the structure and the corresponding processes in the message transmission part MTP of the exchange 1. It can be seen that the SS7 link L1, which is to act as an internal signaling loop S, is treated as a normal link that has been physically set up. The data exchange takes place via the link Ll at the levels of the message transmission part levels 3 and 2.
- the SS7 relevant routing data (route, route set, link, link set etc.) are set up as is known.
- the internal signaling loop S is set up by a special SS7 link L1, which is identified as "Link L1 without SS7 Data Link L2".
- this SS7 link L1 is set up, the logical name of the SS7 link is announced in the respective other virtual network N2 or N5. That , no physical connection L2 is switched for the data transmission of the signaling by the switching center 1 for the communication of the subscribers X and Y. Since there is no physical connection L2 related to the logical connection L1, the link Ll is specially identified.
- the following example illustrates the establishment of the SS7 links for an internal signaling loop S between the networks N2 and N5 in the virtual network 1.
- switching center 3 shows an example for increasing the bandwidth of the connections between the switching center 3 (central database; for example SCP, HLR) and the switching centers 1 and 2 or the signaling transfer points STP connected upstream of the local switching centers LEi. LE N.
- the networks N1 and N2 are set up in the switching center 1 and the networks N3 and N4 in the switching center 2, which are each connected by means of an internal signaling loop S1, S2.
- the signaling traffic arising from the local exchanges LE ⁇ ..LE N can now be distributed via the link sets LS1..LS4. The condition is that the local exchanges LE ⁇ ..LE N in remain unaffected by this extension.
- corresponding routes in the exchange positions 1 and 2 can be set up. For example, a second route is set up in the exchange 1 in the virtual network N2 to the originally existing route LS2 to the database 3 via the internal signaling loop S1 and the linkset LSI to the database 3. In the exchange 2, a second route via the internal signaling loop S2 and the linkset LS3 to the database 3 is set up analogously in the virtual network N4 to the originally existing route LS4 to the database 3. On the basis of data from the signaling traffic and settings in the exchanges 1 and 2, the signaling traffic is distributed evenly over the link sets LS1..LS4.
- the example shows that the data transmission or signaling traffic between the switching centers 1 and 3 or 2 and 3 can be increased with the switching center according to the invention, with no corresponding virtual networks having to be set up in the partner switching center (database) 3.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10159435A DE10159435A1 (en) | 2001-12-04 | 2001-12-04 | conciliation |
DE10159435 | 2001-12-04 | ||
PCT/DE2002/004422 WO2003049457A1 (en) | 2001-12-04 | 2002-12-03 | Routing method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1452046A1 true EP1452046A1 (en) | 2004-09-01 |
Family
ID=7707928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02804155A Withdrawn EP1452046A1 (en) | 2001-12-04 | 2002-12-03 | Routing method |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050002512A1 (en) |
EP (1) | EP1452046A1 (en) |
DE (1) | DE10159435A1 (en) |
WO (1) | WO2003049457A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5282244A (en) * | 1991-06-24 | 1994-01-25 | At&T Bell Laboratories | Virtual signaling network method |
US5481673A (en) * | 1993-08-20 | 1996-01-02 | Bell Communications Research Inc. | Method for cluster routing in direct link using two associated routing tables at node or signaling transfer point |
US6628774B2 (en) * | 1998-11-20 | 2003-09-30 | Ameritech Corporation | Method of routing interlata network traffic |
WO2000011883A1 (en) * | 1998-08-25 | 2000-03-02 | Siemens Aktiengesellschaft | Signalling system of a signalling point |
-
2001
- 2001-12-04 DE DE10159435A patent/DE10159435A1/en not_active Withdrawn
-
2002
- 2002-12-03 EP EP02804155A patent/EP1452046A1/en not_active Withdrawn
- 2002-12-03 US US10/497,260 patent/US20050002512A1/en not_active Abandoned
- 2002-12-03 WO PCT/DE2002/004422 patent/WO2003049457A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO03049457A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003049457A1 (en) | 2003-06-12 |
US20050002512A1 (en) | 2005-01-06 |
DE10159435A1 (en) | 2003-06-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20040303 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR |
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17Q | First examination report despatched |
Effective date: 20070130 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS GMBH & CO. KG |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS S.P.A. |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS GMBH & CO. KG |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20090701 |