CN101808397A - Method and system for realizing registration to long-term evolution home base station - Google Patents
Method and system for realizing registration to long-term evolution home base station Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing registration to an LTE home base station. In the scheme of the invention, after the LTE home base station establishes the SCTP connection with a network element of a core network by an LTE home base station gateway, the LTE home base station sends an S1 interface signaling message for carrying out data switching of an application layer to the LTE home base station gateway and the S1 interface signaling message also carries registration information of the LTE home base station, thus, two functions of the LTE home base station, i.e. data switching with the application layer of the core network by the LTE home base station gateway and registration to the LTE home base station, are realized by one S1 interface. With the scheme provided by the invention, the limitation caused by copying a 3G HNB structure in the HNB registration signaling flow can be avoided, the generation of the signaling redundancy among the network elements can be avoided and the conditions that the cell is repeatedly defined and the protocol is excessively complex are avoided.
Description
Technical Field
The present invention relates to Long Term Evolution (LTE) technology, and in particular, to a method and system for implementing LTE femtocell registration.
Background
In the current 3G Network architecture, a base station is connected to a Core Network (CN) through an Iu interface. In the current LTE network architecture, the network structure is flattened and simplified into two levels, namely, an Evolved universal terrestrial radio access network (E-UTRAN) and an Evolved packet core network (EPC), which are connected to each other through an S1 interface. Fig. 1A and 1B respectively illustrate network architectures of 3G and LTE, where in the 3G network architecture, the Iu interface is an interface between a radio access network and a core network; in the LTE network architecture, the S1 interface is an interface between the radio access network and the core network.
Fig. 2 is a schematic diagram of a protocol stack of an existing S1 interface, and as shown in fig. 2, an application part (S1-AP) of S1 is an upper layer signaling protocol of an S1 interface, and is mainly used for processing various signaling and control of a control plane of the S1 interface, and has the following functions: an Evolved Packet Core (EPC) bearer service management function; user Equipment (UE) mobility in LTE-ACTIVE (LTE _ ACTIVE) state; s1 paging function; a Non-Access Stratum (NAS) node selection function; an initial context establishment function.
A home base station is a small-sized, low-power cellular base station, and is named mainly for use in indoor places such as homes and offices. One of the roles of the home base station is to supplement the indoor coverage of the cellular network and provide voice and data services to the user. The home base station has the characteristics of low cost, plug and play support, broadband access, low power, single-mode terminal use and the like. The home base station may be accessible in 3G and LTE network architectures. In order to facilitate management of the femtocell and reduce the influence on the core network, a femtocell gateway is introduced into a wireless access network accessing the femtocell.
Fig. 3 is a schematic diagram of a network architecture of a conventional 3G home base station (HNB), as shown in fig. 3, in the 3G network, the HNB is connected to a core network through a home base station gateway (HNB GW). Fig. 4A and 4B respectively describe two implementation manners of an LTE home base station (HeNB) network architecture, that is, two connection manners of the HeNB and a core network in an LTE network, where one implementation manner is that the HeNB is directly connected to one network element of an EPC, that is, a Mobility Management Entity (MME), as shown in fig. 4A; another way to implement this is that the HeNB is connected to a network element of the EPC, i.e. the MME, through a home base station gateway (HeNB GW), as shown in fig. 4B.
In the network architecture shown in fig. 4B, an interface between two network elements appears, that is, an interface between the HeNB and the HeNBGW, and an interface between the HeNB GW and the MME. At present, the two interfaces are both represented by S1-MME, and for convenience of distinction, an interface directly connected between the HeNB and MME may still be denoted as an S1 interface, an interface between the HeNB and the HeNB GW is denoted as an S1-a interface, an interface between the HeNB GW and MME is denoted as an S1-B interface, and these three interfaces all adopt signaling flows of the existing S1 interface.
In the 3G HNB architecture, after establishing Stream Control Transmission Protocol (SCTP) connection with HNB GW, HNB registers with HNB GW through HNB registration procedure. When the HNB sees that the HNB GW is the core network element, and after the SCTP connection between the HNB and the HNB GW is established, the first interaction process between the HNB and the HNB GW is the HNB registration procedure. Through the HNB registration procedure, the HNB provides the HNB GW with the current HNB Identity (ID) and location information, and the Closed Subscriber Group identity (CSG-ID), and the HNB GW can provide the HNB with the connection to the core network. In the application protocol of Iu interface of 3G network architecture, the first message that UE initiates service to core network is UE initialization message, and no other signaling flow completes information interaction between HNB and core network.
At present, only the process of registering HNB to HNB GW in a 3G home base station network architecture is defined; however, for the LTE femtocell network architecture, a specific implementation of the procedure of registering the HeNB with the HeNB GW has not been explicitly given yet.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a system for implementing registration of an LTE home base station, which define a registration procedure of the LTE home base station.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for realizing Long Term Evolution (LTE) home base station registration, wherein the LTE home base station establishes Stream Control Transmission Protocol (SCTP) connection with a core network through an LTE home base station gateway, and the method comprises the following steps: and the LTE home base station sends an S1 interface signaling message for carrying out application layer data exchange to the LTE home base station gateway, wherein the S1 interface signaling message also carries the registration information of the LTE home base station.
The registration information includes, but is not limited to: public land mobile network PLMN identification, cell identification, tracking area TA identification and CSG related information.
After the sending of the S1 interface signaling message, the method further includes: and the LTE home base station gateway receives the S1 interface signaling message and performs corresponding processing according to whether the registration request of the LTE home base station is accepted or not.
When accepting the registration request of the LTE home base station, the processing comprises the following steps: and extracting and storing the registration information carried in the S1 interface signaling message, establishing S1 interface signaling connection with the LTE home base station, and performing application layer data exchange between the LTE home base station and a core network.
The application layer data exchanges include, but are not limited to: the LTE home base station comprises a global LTE base station identifier, a supported tracking domain, a broadcast tracking domain and a PLMN identifier to which the LTE home base station belongs.
After the processing, further comprising: and the LTE home base station gateway returns a response message to the LTE home base station, wherein the response message carries the identifier of the LTE home base station gateway.
When the registration request of the LTE home base station is not accepted, the processing comprises the following steps: and not establishing signaling connection with the LTE home base station, and returning a connection establishment failure message to the LTE home base station, wherein the connection establishment failure message further carries a failure reason.
A system for realizing registration of an LTE home base station comprises the LTE home base station and an LTE home base station gateway, wherein the LTE home base station gateway is used for establishing SCTP connection between the LTE home base station and a core network; the LTE home base station is used for sending an S1 interface signaling message for carrying out application layer data exchange to the LTE home base station gateway, and the S1 interface signaling message also carries registration information of the LTE home base station.
The LTE home base station gateway is further used for receiving the signaling message of the S1 interface and carrying out corresponding processing according to whether the registration request of the LTE home base station is accepted or not.
When accepting a registration request of an LTE home base station, the LTE home base station gateway is configured to: extracting and storing the registration information carried in the S1 interface signaling message, establishing S1 interface signaling connection with the LTE home base station, and performing application layer data exchange between the LTE home base station and a core network; or when the registration request of the LTE home base station is not accepted, the LTE home base station gateway does not establish signaling connection with the LTE home base station and is used for returning a connection establishment failure message to the LTE home base station.
In the scheme of the invention, after the LTE home base station establishes SCTP connection with a core network element through the LTE home base station gateway, the LTE home base station sends an S1 interface signaling message to the LTE home base station gateway, and the S1 interface signaling message carries registration information of the LTE home base station besides information for carrying out application layer data exchange, so that two functions of application layer data exchange of the LTE home base station and the core network and registration of the LTE home base station through the LTE home base station gateway are realized through one S1 interface signaling.
The scheme provided by the invention can avoid the limitation caused by moving the registration signaling flow of the HNB in the 3G HNB architecture, avoid the excessive redundancy of the signaling between network elements and avoid the situations of repeated cell definition and excessively complicated protocol.
Drawings
FIG. 1A is a schematic diagram of a conventional 3G network architecture;
fig. 1B is a schematic diagram of a conventional LTE network architecture;
fig. 2 is a schematic diagram of a protocol stack of a conventional S1 interface;
fig. 3 is a schematic diagram of a conventional 3G HNB network architecture;
fig. 4A is a schematic diagram of a conventional LTE HeNB network architecture;
fig. 4B is a schematic diagram of a conventional LTE HeNB network architecture;
fig. 5 is a flowchart of LTE hnb registration according to an embodiment of the present invention;
fig. 6 is a flowchart of registration of an LTE home base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a system for implementing LTE home base station registration in the present invention.
Detailed Description
Although the simplest method is to completely adopt the HNB registration signaling flow of the Iuh interface in the 3G HNB architecture at the S1-a interface of the LTE HeNB architecture, the problem with such a process is that the signaling interaction between the HeNB and the HeNB GW is increased. The specific reasons are as follows: in an LTE network, after SCTP connection between a base station and an MME is established, the base station and a core network establish information through an S1 interface of an S1-A interface to complete information interaction; in the 3G femtocell system, the information carried in the registration message of the femtocell overlaps with the information carried in the S1 interface setup message. This results in signaling redundancy between network elements, duplication of cell definitions and overly complex protocols. Therefore, the present invention proposes a registration scheme for LTE home base stations to avoid the above limitations.
In the invention, an LTE home base station is connected with a core network through an LTE home base station gateway, after the LTE home base station establishes SCTP connection with a core network element through the LTE home base station gateway, the LTE home base station sends an S1 interface signaling message for carrying out application layer data exchange to the LTE home base station gateway, and the S1 interface signaling message also carries registration information of the LTE home base station so as to realize registration of the LTE home base station in the LTE home base station gateway, thus realizing two functions of application layer data exchange of the LTE home base station and the core network through the LTE home base station gateway and registration of the LTE home base station through one S1 interface signaling.
Further, the LTE femtocell gateway receives an S1 interface signaling message from the LTE femtocell, and performs corresponding processing according to whether to accept the registration request of the LTE femtocell. If the LTE home base station gateway receives the registration request of the LTE home base station and agrees to establish S1 interface signaling connection with the LTE home base station, extracting and storing the registration information of the LTE home base station from the received S1 interface signaling message, establishing signaling connection with the LTE home base station, exchanging application layer data of the LTE home base station and a core network, and further returning a response message to the LTE home base station, wherein the response message carries the identifier of the LTE home base station gateway; and if the LTE home base station gateway does not accept the registration request of the LTE home base station, not establishing signaling connection with the LTE home base station, and returning a connection establishment failure message to the LTE home base station, wherein the connection establishment failure message can carry a failure reason.
Fig. 5 is a registration flow chart of an LTE home base station according to an embodiment of the present invention, and as shown in fig. 5, the registration flow of the LTE home base station includes the following specific steps:
step 501: the LTE home base station and the LTE home base station gateway establish SCTP connection, namely the LTE home base station and a core network element establish SCTP connection through the LTE home base station gateway.
Step 502: the LTE home base station sends an S1 interface connection establishment request for carrying out application layer data exchange to the LTE home base station gateway, and the S1 interface connection establishment request also carries registration information of the LTE home base station. The registration information includes, but is not limited to: an LTE femtocell identifier, an LTE femtocell name, LTE femtocell location information, a Public Land Mobile Network (PLMN) identifier, a cell identifier, a Tracking Area (TA) identifier, CSG-related information, and the like. The LTE home base station identifier is used for identifying one LTE home base station so as to distinguish different LTE home base stations; the PLMN identification is used for identifying the PLMN to which the LTE home base station belongs; the cell identifier is used for identifying a cell where the LTE home base station is located; TA identification: the tracking domain is used for identifying the LTE home base station; the CSG related information includes a CSG ID, an LTE home base station access mode, and the like.
Step 503: the LTE home base station gateway receives the S1 interface connection establishment request, determines to accept the registration request of the LTE home base station, agrees to establish signaling connection with the LTE home base station, establishes S1 interface signaling connection with the LTE home base station, extracts and stores registration information of the LTE home base station carried in the S1 interface connection establishment request, and performs application layer data exchange and storage of the LTE home base station and a core network. The application layer data exchange mainly comprises: the LTE home base station comprises a global LTE base station identifier, a supported Tracking Area (TAs), a broadcast tracking area and a PLMN identifier to which the LTE home base station belongs.
Step 504: and the LTE home base station gateway sends an S1 interface connection establishment request response message to the LTE home base station to inform the LTE home base station that the signaling connection is successfully established and successfully registered. The S1 interface connection establishment request response message carries the identifier of the LTE hnb gateway.
Fig. 6 is a registration flow chart of an LTE home base station according to an embodiment of the present invention, and as shown in fig. 6, the registration flow of the LTE home base station includes the following specific steps:
step 601: the LTE home base station and the LTE home base station gateway establish SCTP connection, namely the LTE home base station and a core network element establish SCTP connection through the LTE home base station gateway.
Step 602: the LTE home base station sends an S1 interface connection establishment request for carrying out application layer data exchange to the LTE home base station gateway, and the S1 interface connection establishment request also carries registration information of the LTE home base station. The registration information includes, but is not limited to: the LTE home base station comprises an LTE home base station identifier, an LTE home base station name, LTE home base station position information, a PLMN identifier, a cell identifier, a TA identifier, CSG related information and the like.
Step 603: the LTE home base station gateway receives the S1 interface connection establishment request, determines that the registration request of the LTE home base station is not accepted, does not establish the signaling connection with the LTE home base station, sends an S1 interface connection establishment failure message to the LTE home base station, informs the LTE home base station gateway of rejecting the establishment of the S1 interface signaling connection with the LTE home base station through the message, and rejects the registration request of the LTE home base station.
The invention also discloses a system for realizing the registration of the LTE home base station, which comprises the LTE home base station and an LTE home base station gateway, wherein the LTE home base station gateway is used for establishing SCTP connection between the LTE home base station and a core network; the LTE home base station is used for sending an S1 interface signaling message for carrying out application layer data exchange to the LTE home base station gateway, and the S1 interface signaling message also carries registration information of the LTE home base station. The LTE home base station gateway is further used for carrying out corresponding processing according to whether the registration request of the LTE home base station is accepted or not.
If the LTE femtocell gateway receives the registration request of the LTE femtocell and agrees to establish signaling connection with the LTE femtocell, the LTE femtocell gateway is used for extracting and storing the registration information of the LTE femtocell from the received S1 interface signaling message, establishing S1 interface signaling connection with the LTE femtocell and performing application layer data exchange between the LTE femtocell and a core network; and further, the LTE home base station gateway is used for returning a response message to the LTE home base station, wherein the response message carries the identifier of the LTE home base station gateway.
And if the LTE home base station gateway does not accept the registration request of the LTE home base station, not establishing signaling connection with the LTE home base station, and returning a connection establishment failure message to the LTE home base station, wherein the connection establishment failure message can carry a failure reason.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for realizing Long Term Evolution (LTE) home base station registration is disclosed, the LTE home base station establishes Stream Control Transmission Protocol (SCTP) connection with a core network through an LTE home base station gateway, and the method is characterized by comprising the following steps:
and the LTE home base station sends an S1 interface signaling message for carrying out application layer data exchange to the LTE home base station gateway, wherein the S1 interface signaling message also carries the registration information of the LTE home base station.
2. The method of claim 1, wherein the registration information includes, but is not limited to: public land mobile network PLMN identification, cell identification, tracking area TA identification and CSG related information.
3. The method according to claim 1 or 2, wherein after said sending the S1 interface signaling message, further comprising: and the LTE home base station gateway receives the S1 interface signaling message and performs corresponding processing according to whether the registration request of the LTE home base station is accepted or not.
4. The method of claim 3, wherein when accepting the registration request of the LTE home base station, the processing comprises: and extracting and storing the registration information carried in the S1 interface signaling message, establishing S1 interface signaling connection with the LTE home base station, and performing application layer data exchange between the LTE home base station and a core network.
5. The method of claim 4, wherein the application layer data exchange includes, but is not limited to: the LTE home base station comprises a global LTE base station identifier, a supported tracking domain, a broadcast tracking domain and a PLMN identifier to which the LTE home base station belongs.
6. The method of claim 4, wherein after the processing, further comprising: and the LTE home base station gateway returns a response message to the LTE home base station, wherein the response message carries the identifier of the LTE home base station gateway.
7. The method of claim 3, wherein when the registration request of the LTE home base station is not accepted, the processing comprises: and not establishing signaling connection with the LTE home base station, and returning a connection establishment failure message to the LTE home base station, wherein the connection establishment failure message further carries a failure reason.
8. A system for realizing registration of an LTE home base station comprises the LTE home base station and an LTE home base station gateway, and is characterized in that,
the LTE home base station gateway is used for establishing SCTP connection between the LTE home base station and a core network;
the LTE home base station is used for sending an S1 interface signaling message for carrying out application layer data exchange to the LTE home base station gateway, and the S1 interface signaling message also carries registration information of the LTE home base station.
9. The system of claim 8, wherein the LTE home base station gateway is further configured to receive the S1 interface signaling message, and perform corresponding processing according to whether to accept the registration request of the LTE home base station.
10. The system of claim 9,
when accepting a registration request of an LTE home base station, the LTE home base station gateway is configured to: extracting and storing the registration information carried in the S1 interface signaling message, establishing S1 interface signaling connection with the LTE home base station, and performing application layer data exchange between the LTE home base station and a core network; or,
and when the registration request of the LTE home base station is not accepted, the LTE home base station gateway does not establish signaling connection with the LTE home base station and is used for returning a connection establishment failure message to the LTE home base station.
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| CN102858007A (en) * | 2011-06-29 | 2013-01-02 | 中兴通讯股份有限公司 | Processing method and device of femtocell registration message |
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| RU2605000C2 (en) * | 2012-09-28 | 2016-12-20 | ЗетТиИ Корпорейшн | Method and device to increase gateway stability in femtocell system in lte mode |
| CN103974235A (en) * | 2013-01-25 | 2014-08-06 | 中兴通讯股份有限公司 | Route addressing method and system, source base station, target base station and gateway |
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| CN105052182A (en) * | 2013-12-31 | 2015-11-11 | 华为技术有限公司 | Method, device and system for selecting lte network |
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Application publication date: 20100818 |