KR20130125659A - Mobile communication and serving gprs support node(sgsn) - Google Patents

Abstract

Disclosed are a mobile communication system and a packet switching support node according to an embodiment of the present invention. The mobile communication system comprises: a first wireless network for supporting a first wireless access technique; a second wireless network for supporting a second wireless access technique; at least one first mobile switching center in the first wireless network for managing, by being connected to the first base station, the mobility of a mobile terminal which accesses a first base station; and a second mobile switching center in the second wireless network for requesting a handover of the mobile terminal by selecting a first mobile switching center which is matched to a first base station ID which is transferred from a control device among the at least one first mobile switching center by searching a matching table which matches the first base station ID to the first mobile switching center or transferring a message transmitted to the first base station if the handover of the mobile terminal from the first wireless network to the second wireless network is requested or the control device for the first wireless network receives the message which is transferred to the first station. [Reference numerals] (200) UTEAN system;(300) eUTRAN system;(390) Internet

Description

[0001] MOBILE COMMUNICATION AND SERVING [0002] BACKGROUND OF THE INVENTION [0003]

The present invention relates to a mobile communication system and a packet-switched support node, and more particularly to a mobile communication system and a packet-switched support node, in which a handover is performed from a 3G network to an LTE (Long Term Evolution) network, or an RNC (RNC) transmits a RIM RELAY message The Serving GPRS Support Node (SGSN) selects a MME (Mobility Management Entity) associated with the eNodeB.

Conventionally, the Serving GPRS Support Node (SGSN) manages the entire 28-bit ID of the eNodeB and the corresponding MME (Mobility Management Entity) connected to the eNodeB.

At this time, since the TA (tracking area) managed by the eNodeB is smaller than the eNodeB, a 1: 1 mapping table (or TAI-MME mapping table) between the tracking area identity (TAI) and the MME is actually provided. To retrieve the MME.

However, when searching using the mapping table as described above, it is not easy to maintain a 1: 1 mapping table between the TAI and the MME, and there is a problem in that the search operation of this table is inefficient have.

SUMMARY OF THE INVENTION The present invention provides a mobile communication system and a packet switching support node that are easy to search for an MME (Mobility Management Entity).

According to an aspect of the present invention, there is provided a mobile communication system including a first wireless network supporting a first wireless access technology and a second wireless network supporting a second wireless access technology, At least one first exchange of the second radio network connected to a first base station of the network and managing mobility of a mobile terminal connected to the first base station; And a first handover request for handover from the first wireless network to the second wireless network for the mobile terminal, or when a control device of the first wireless network receives a message transmitted to the first base station. Search for a matching table in which the ID of the base station and the first exchange are matched with each other, and select a first exchange that matches the target first base station ID received from the control device of the first wireless network from among the one or more first exchanges; And a second exchange of the first wireless network requesting a handover or delivering the message.

At this time, the ID of the first base station is set such that some bits of all the bits constituting the ID are set as index bits,

The matching table includes first exchanger information for each index bit,

The second exchanger of the first radio network,

A storage unit for storing the matching table; A search unit for searching the matching table based on the index bits of the target first base station ID; And a selector that selects a first exchange matched with the index bits.

In addition, the matching table,

A first field for storing the index bits; A plurality of second fields matched with the first field, the IP addresses of the first exchanger being recorded; And a third field matching the plurality of second fields, the third field including selection control information of the first exchange,

Wherein the selection unit comprises:

One of the plurality of first exchangers matching the index bit of the target first base station ID can select one of the first exchangers in proportion to the selection control information.

In addition,

And may be some first bit among all the bits constituting the ID.

In the matching table, first exchanger information is matched for each band of the first base station ID.

The second exchanger of the first radio network,

A storage unit for storing the matching table; A search unit for searching the matching table based on a band including the target first base station ID; And a selector for selecting a first exchange matched to a band including the target first base station ID.

In addition, the matching table,

A first field for storing a band of the first base station ID; A plurality of second fields matched with the first field, the IP addresses of the first exchanger being recorded; And a third field matching the plurality of second fields, the third field including selection control information of the first exchange,

The selector may select one of the plurality of first exchangers matching the band of the target first base station ID in proportion to the selection control information.

Further, one second exchange may be interlocked with a plurality of first exchanges, and the first base station may be connected to one or more first exchanges.

According to another feature of the invention, the packet-switching support node is a packet-switching support node of the first radio network that supports the first radio access technology, and constitutes an ID of a base station of the second radio network that supports the second radio access technology. A storage unit for storing a matching table to which the mobility management node information of the second wireless network is matched for each preset index bit among all bits; A search unit for searching the matching table based on the index bits extracted from a target base station ID received from a wireless network controller of the first wireless network; A selector for selecting a mobility management node of the second wireless network matched with the index bits; And an interworking unit for interworking with the matched mobility management node and delivering a handover requested by the radio network controller or a message transmitted by the radio network controller.

According to another feature of the invention, the packet-switching support node is a packet-switching support node of the first radio network that supports the first radio access technology, and the packet switching support node of the base station of the base station of the second radio network that supports the second radio access technology. A storage unit storing a matching table to which the mobility management node information of the second wireless network is matched for each band; A search unit for searching the matching table based on a band including a target base station ID received from a wireless network controller of the first wireless network; A selection unit for selecting a mobility management node of the second wireless network matched with a band including the target base station ID; And an interworking unit for interworking with the matched mobility management node and delivering a handover requested by the radio network controller or a message transmitted by the radio network controller.

According to the embodiment of the present invention, the search table maintenance of the Serving GPRS Support Node (SGSN) for interworking with the MME (Mobility Management Entity) is simple, and the likelihood of call processing failure due to selection of an incorrect MME can be reduced.

1 shows a configuration of a mobile communication system according to an embodiment of the present invention.
2 illustrates a connection structure between an SGSN, an MME, and an eNodeB according to an embodiment of the present invention.
3 is a block diagram illustrating a configuration of an SGSN according to an embodiment of the present invention.
4 illustrates an ID structure of an eNodeB according to an embodiment of the present invention.
5 shows a configuration of a mapping table according to an embodiment of the present invention.
6 shows a configuration of a mapping table according to another embodiment of the present invention.
7 is a flowchart illustrating an operation method of an SGSN according to an embodiment of the present invention.
8 is a flowchart illustrating an operation method of the SGSN according to another embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment , An access terminal (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment,

In this specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B, an evolved NodeB (eNodeB) A base station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may perform all or a part of functions of an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, .

Hereinafter, a mobile communication system and a packet switching support node according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 illustrates a configuration of a mobile communication system according to an embodiment of the present invention, and FIG. 2 illustrates a connection structure between an SGSN, an MME, and an eNodeB according to an embodiment of the present invention.

1, a user equipment (UE) 100 is connected to a UMTS Terrestrial Radio Access Network (UTRAN) system 200 and an evolved Universal Terrestrial Radio Access Network (EUTRAN) system 300, It is possible.

The UTRAN system 200 supports a W-CDMA radio access technology and includes a Node B 210, an RNC (Radio Network Controller) 230, a Serving GPRS Support Node (SGSN) 250, And a Gateway GPRS Support Node (GGSN)

The NodeB 210 is a base station under the control of the RNC 230 and is responsible for physical radio access, that is, radio physical channel setting, channel coding, modulation and demodulation. An area where wireless communication formed by the NodeB 210 is typically a cell having a relatively large radius called a macro cell.

The RNC 230 is responsible for dynamic resource allocation, e.g., handover, of radio resources in the radio access network.

The SGSN 250 stores location information of each terminal to provide a general packet radio service (GPRS) service to the subscriber. And performs a subscriber authentication and matching function with the GGSN 270. And performs session control setup, maintenance and release functions for packet data transmission.

The GGSN 270 performs an interworking function between the GPRS network and the external packet data network. And assigns an IP address to the mobile terminal 100 requesting the packet service. The SGSN 250 transmits packet data to an external packet network such as the Internet, and performs a tunneling function to transmit packet data from the outside to the mobile terminal 100.

The eUTRAN system 300 supports an LTE (Long Term Evolution) technology and includes an eNodeB 310, an MME (Mobility Management Entity) 330, an S-GW (Serving Gateway) A packet data network gateway (P-GW) 370, and an Internet network 390.

The eNodeB 310 is an apparatus that wirelessly connects to the mobile terminal 100 and allocates a frequency to the mobile terminal 100 and includes radio bearer control, admission control, mobility control, scheduling, and security Which is responsible for all wireless related functions.

The MME 330 manages the mobile terminal 100 and selects the S-GW 350 and the P-GW 370 for the mobile terminal 100. And performs functions related to roaming and authentication. And processes a bearer signal generated in the mobile terminal 100.

In addition, the MME 330 is connected to the eNodeB 310 and is connected to the mobile terminal 100 via the eNodeB 310 wirelessly. And communicates with the mobile terminal 100 using a NAS (Non Access Stratum) message. At this time, the MME 330 supports a plurality of tracking areas, and is connected to the eNodeBs 310 that support each tracking area information.

The S-GW 250 serves as a mobility anchor when the mobile terminal 100 moves between handovers between the eNodeBs 210 or between 3GPP wireless networks.

The P-GW 270 assigns an IP (Internet Protocol) address of the mobile terminal 100, performs packet data related functions of the core network, and performs a mobility anchor role when moving between the 3GPP wireless network and the non-3GPP wireless network. do.

At this time, when the mobile terminal 100 handover from the UTRAN system 200 to the eUTRAN system 300 or when the RNC 230 transmits a RIM Relay message to the eNodeB 310, the SGSN 250 Selects the MME 330 associated with the target eNodeB 310. [

Here, the SGSN 250, the MME 330, and the eNodeB 310 have a structure as shown in FIG.

Referring to FIG. 2, one SGSN 250 is connected to a plurality of MMEs 330, and each MME 330 can be connected to a plurality of eNodeBs 310, respectively.

At this time, one eNodeB 310 may be connected to two or more MMEs 330.

According to the 3GPP 25.413 standard, the RNC 230 includes a target (TARGET-eNB ID) in the target TARGET ID field of a handover message or a RIM Relay message transmitted to the SGSN 250. The SGSN 250 selects the MME 330 connected to the target eNodeB 310 using the target TARGET-eNB ID included in the TARGET ID field.

3 is a block diagram illustrating a configuration of an SGSN according to an embodiment of the present invention. At this time, the configuration of the SGSN is omitted, and only the configuration for interfacing with the MME 330 after searching and selecting the MME 330 according to the embodiment of the present invention is shown briefly.

3, the SGSN 250 includes a storage unit 253 for storing a mapping table 251, a search unit 255, a selection unit 257, and an MME linkage unit 259.

Here, the mapping table 251 stores mapping information between the eNodeB 310 and the MME 330.

The searching unit 255 searches the mapping table 251 based on the information of the target eNodeB 310 acquired from the RNC 230 and extracts information of one or more MMEs 330 mapped with the target eNodeB 310. [

The selecting unit 257 selects one MME 330 among the one or more MMEs 330 mapped to the target eNodeB 310 searched by the searching unit 255. [

Upon receiving the handover request message or the rim relay message from the RNC 230, the MME interworking unit 259 requests the searching unit 255 to search for the MME. The selector 257 requests the handover process requested by the RNC 230 or delivers a rim relay message to the MME selected by the selector 257.

At this time, the mapping table 251 is capable of the following two embodiments.

4 illustrates an ID structure of an eNodeB according to an embodiment of the present invention.

Referring to Figure 4, The ID of the eNodeB 310 is composed of 20/28 bits (MACRO eNB is 20 bits and Home eNB is 28 bits), the former 8 bits are set as the MME search index, and the bits set in the MME search index are index bits define. Of course, the MME search index may be more or less than 8 bits.

When matching the same MME 330 to one or more eNodeBs 310, the index bits of the corresponding one or more eNodeBs 310 are all the same.

A mapping table using such index bits can be implemented as shown in FIG. 5 below.

5 shows a configuration of a mapping table according to an embodiment of the present invention.

5, the mapping table 251 includes an MME search index field 251-1, an MME IP field 251-2, and a CAPA field 251-3, and includes an MME pooling function and a CAPA .

Here, one or more MMEs 330 can interwork with one eNodeB 310 by the MME pooling function. And the MME 330 is selected in proportion to the CAPA among the one or more MMEs 330 interworking with one eNodeB 310. [

In this case, CAPA generally refers to the Relative MME Capacity defined in the TS 36.413 document, and refers to the processing capacity of the MME relative to other MMEs for load balancing between MMEs, and is defined as shown in Table 1 below.

IE / Group Name Presence Range IE type and reference Semantics description Relative MME Capacity M INTEGER (0..255)

In the embodiment of the present invention, the CAPA is used to select the MME by borrowing the CAPA concept of the general MME from the SGSN 250, rather than the CAPA of the MME defined above.

which is different from the CAPA used when the eNodeB 310 distributes calls to the MME 330, is a newly proposed one. Since the conventional CAPA is a concept that the MME 330 provides the fixed CAPA to the eNodeB 310 and the eNodeB 310 distributes its call to the various MMEs 330 using the fixed CAPA, The eNodeBs 310 could not be connected to the local MME 330 first. However, CAPA according to the embodiment of the present invention differs from the conventional concept in that one or more MMEs 330 are matched with each other by ID group of the eNodeB 310 and CAPA is set to a specific MME 330. In this case, the SGSN 250 selects the MME 330 to be linked with the eNodeB 310 in proportion to the CAPA in handling the handover or the rim relay message of the mobile terminal 100, so that the eNodeB 310 can be adjusted so that a particular MME 330 is selected.

Here, the MME search index field 251-1 includes index bits set in the MME search index among the IDs of the eNodeBs 310. [ For example, as described in FIG. 4, if 8 bits are set in the MME search index, corresponding index bits, that is, "11001100" are recorded.

The MME IP field 251-2 is matched with the MME search index field 251-1 and the IP address of the MME 330 (e.g., 10.10.10.10, 20.20.20.20) is recorded. At this time, the MME IP field 251-2 may be composed of one or more fields.

The CAPA field 251-3 is mapped to the MME IP field 251-2, and the CAPA information of the MME 330 is stored.

When the mapping table 251 is used, the IDs of the eNodeBs 310 belonging to a specific area can be assigned IDs so that they have the same index bits, and the MME IPs and index bits located in the specific areas can be matched.

6 shows a configuration of a mapping table according to another embodiment of the present invention.

Referring to FIG. 6, the mapping table 251 'includes an eNodeB band field 251-4, an MME IP field 251-5, and a CAPA field 251-6.

At this time, the MME IP field 251-5 and the CAPA field 251-6 of the mapping table 251 'are the same as the MME IP field 251-2 and the CAPA field 251-3, respectively, As in FIG. 5, the MME pooling function and the CAPA are reflected.

Here, the eNodeB band field 251-4 contains the band information of the ID of the eNodeB 310. [ For example, if the ID of the eNodeB 310 is within the range of 1 to 1000, then the two MMEs 330 with the MME IPs 10.10.10.10 and 20.20.20.20 are matched and the IDs of the eNodeBs 310 are 1001 to 2000 , It is possible to match the MME 330 with the MME IP 30.30.30.30.

When using the mapping table 251 ', the ID of the eNodeB 310 belonging to a specific area may be allocated to belong to a specific band, and the specific band of the ID and the MME IP located in the specific area may be matched.

Meanwhile, the MME IP and CAPA of the mapping tables 251 and 251 'described above can be changed by the operator or the system itself. For example, the eNodeB 310 located in a specific area may set the MME IP to be fixed and the CAPA to be high so as to access the specific MME 330 first. In addition, when a specific MME 330 fails, the CAPA can be lowered to lower the selectivity of the SGSN 250 to prevent call processing incapability.

The operation of the SGSN 250 using the mapping tables will now be described.

FIG. 7 is a flowchart illustrating an operation method of an SGSN according to an embodiment of the present invention, and shows a MME search method using the mapping table of FIG.

Referring to FIG. 7, the MME interworking unit 259 receives a handover request message from the RNC 230 to the eUTRAN system 300 in the UTRAN system 200 (S101). Or the MME interlocking unit 259 receives the rim relay message from the RNC 230 (S103).

The search unit 255 then checks the index bit of the target TARGET-eNB ID included in the target TARGET ID field of the message received from the RNC 230 in step S101 or step S103 (S105).

Next, the searching unit 255 searches the mapping table 251 for the MME search index field 251-1 containing the index bits confirmed in step S105 (S107).

Next, the searching unit 255 retrieves one or more MME information from the MME search index field 251-1 and the MME IP field 251-2 matched in step S107 (S109).

Next, the selecting unit 257 selects one MME 330 in proportion to the CAPA recorded in the CAPA field 251-3 matched with one or more MMEs recorded in the MME IP field 251-2 (S111) . According to the mapping table 251 of FIG. 5, for example, if the index bit of the ID of the eNodeB 310 is "11001100", the MME 330 with the MME IP of 10.10.10.10 is selected at a 50% The MME 330 with .20.20 is also selected as 50%.

Next, the MME linkage unit 259 transmits a handover request message or a rim relay message to the MME 330 selected by the selection unit 257 (S113).

FIG. 8 is a flowchart illustrating an operation method of an SGSN according to another embodiment of the present invention, and shows an MME search method using the mapping table of FIG.

Referring to FIG. 8, the MME interworking unit 259 receives a message requesting handover from the RNC 230 to the eUTRAN system 300 in the UTRAN system 200 (S201). Or the MME interlocking unit 259 receives the rim relay message from the RNC 230 (S203).

Then, the searching unit 255 searches the bandwidth field 251-4 corresponding to the target ID (TARGET-eNB ID) included in the target TARGET ID field of the message received from the RNC 230 in step S201 or step S203 Is retrieved from the mapping table 251 '(S205).

Next, the searching unit 255 searches one or more MME information from the MME IP field 251-5 matched with the band field 251-4 searched in step S205 (S207).

Next, the selecting unit 257 selects one MME 330 in proportion to the CAPA recorded in the CAPA field 251-6 matched with one or more MMEs recorded in the MME IP field 251-4 (S209) . According to the mapping table 251 'of FIG. 6, for example, if the ID of the eNodeB 310 is 10, the MME 330 with the MME IP of 10.10.10.10 is selected with a 30% (330) is selected as 70%.

Next, the MME linkage unit 259 transmits a handover request message or a rim relay message to the MME 330 selected by the selection unit 257 (S211).

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (12)

1. A mobile communication system including a first wireless network supporting a first wireless access technology and a second wireless network supporting a second wireless access technology,
At least one first exchange of the second wireless network connected to the first base station of the second wireless network and managing mobility of the mobile terminal connected to the first base station; And
The first base station when receiving a request for handover from the first wireless network to the second wireless network for the mobile terminal or a message transmitted by the control device of the first wireless network to the first base station; Search for a matching table in which the ID and the first exchange are matched with each other, select a first exchange matched with a target first base station ID received from a control device of the first wireless network from among the one or more first exchanges, and then perform the search. A second switch in the first wireless network requesting over or delivering the message
The mobile communication system comprising: The method of claim 1,
The ID of the first base station is set such that some bits of all the bits constituting the ID are set as index bits,
The matching table,
The first exchange information is stored for each index bit,
The second exchanger of the first radio network,
A storage unit for storing the matching table;
A search unit for searching the matching table based on the index bits of the target first base station ID; And
A selector for selecting a first exchange matched with the index bits,
The mobile communication system comprising: 3. The method of claim 2,
The matching table,
A first field for storing the index bits;
A plurality of second fields matched with the first field, the IP addresses of the first exchanger being recorded; And
A third field matching the plurality of second fields and containing selection control information of the first exchange,
Wherein the selection unit comprises:
And selects one first exchange in proportion to the selection control information among a plurality of first exchanges matched with the index bits of the target first base station ID. The method of claim 3,
Wherein the index bits include:
And the first bit is the first bit among all the bits constituting the ID. The method of claim 1,
The matching table,
The first exchange information is matched for each band of the first base station ID,
The second exchanger of the first radio network,
A storage unit for storing the matching table;
A search unit for searching the matching table based on a band including the target first base station ID; And
Selecting a first exchange matched to a band including the target first base station ID;
The mobile communication system comprising: The method of claim 5,
The matching table,
A first field for storing a band of the first base station ID;
A plurality of second fields matched with the first field, the IP addresses of the first exchanger being recorded; And
A third field matching the plurality of second fields and containing selection control information of the first exchange,
Wherein the selection unit comprises:
And selects one of the first exchangers in proportion to the selection control information among the plurality of first exchangers matched with the band of the target first base station ID. The method of claim 1,
One second exchanger interlocks with the plurality of first exchangers,
Wherein the first base station is connected to one or more first exchangers. A packet switching support node of a first wireless network supporting a first wireless access technology,
A storage unit for storing a matching table in which mobility management node information of the second wireless network is matched for each preset index bit among all bits constituting the ID of the base station of the second wireless network that supports the second wireless access technology;
A search unit for searching the matching table based on the index bits extracted from a target base station ID received from a wireless network controller of the first wireless network;
A selector for selecting a mobility management node of the second wireless network matched with the index bits; And
An interworking unit for interworking with the matched mobility management node to deliver a handover requested by the wireless network controller or a message transmitted by the wireless network controller;
Packet switched support node comprising a. 9. The method of claim 8,
The matching table,
A first field for storing the index bits;
A plurality of second fields matching an IP address of a mobility management node of the second wireless network, the second fields being matched with the first field; And
And a third field matching the plurality of second fields and including selection control information of the mobility management node of the second wireless network,
Wherein the selection unit comprises:
And selects one mobility management node in proportion to the selection control information among a plurality of mobility management nodes matched with the index bits of the target base station ID. 10. The method of claim 9,
Wherein the index bits include:
Wherein the first bit is the first bit among all the bits constituting the ID. A packet switching support node of a first wireless network supporting a first wireless access technology,
A storage unit for storing a matching table in which mobility management node information of the second wireless network is matched for each band of an ID of a base station of a second wireless network supporting a second wireless access technology;
A search unit for searching the matching table based on a band including a target base station ID received from a wireless network controller of the first wireless network;
A selection unit for selecting a mobility management node of the second wireless network matched with a band including the target base station ID; And
An interworking unit for interworking with the matched mobility management node to deliver a handover requested by the wireless network controller or a message transmitted by the wireless network controller;
Packet switched support node comprising a. 12. The method of claim 11,
The matching table,
A first field for storing a band of an ID of a base station of the second wireless network;
A plurality of second fields matching an IP address of a mobility management node of the second wireless network, the second fields being matched with the first field; And
And a third field matching the plurality of second fields and including selection control information of the mobility management node of the second wireless network,
Wherein the selection unit comprises:
And selects a mobility management node of one second wireless network in proportion to the selection control information among mobility management nodes of a plurality of second wireless networks matching the band of the target base station ID.

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