WO2004068810A1

WO2004068810A1 - A method of global system for mobile communications network and code division multiple access network utilizing the same base station

Info

Publication number: WO2004068810A1
Application number: PCT/CN2003/001157
Authority: WO
Inventors: Tianzhen Huang; Guanghua Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2003-01-30
Filing date: 2003-12-31
Publication date: 2004-08-12
Also published as: CN1522083A; CN1286342C; AU2003296233A1

Abstract

A method of GSM network and CDMA network utilizing the same Base Station, the method comprises following steps: 1) sets mobile switching node (MSN) between the GSM core network and the primary Base Station (BS) of CDMA network, and establishes the connection between MSN and CDMA mobile switching center; 2) MSN adopts multi-signaling points technique, transmits speech path and signaling between MSN and CDMA Base Station, and transmits signaling between MSN and mobile switching center (CMSC); Through primary connection, the signaling is transmitted between the said CDMA Base Station and CMSC. This invention realizes GSM network and CDMA network utilizing the same Base Station apparatus, reduces the cost of establishing network, and improves the utilizable efficiency of system resource. If BS enlarges latter, GSM and primary CDMA both can share the enlarged network overcast.

Description

Method for sharing base stations in global mobile communication network and code division multiple access network

The present invention relates to access technologies of the Global Mobile Communication Network (GSM) and Code Division Multiple Access (CDMA) networks, and particularly to a method for sharing a base station between a GSM network and a CDMA network. Background of the invention

At present, the CDMA access network and the GSM core network are excellent networks that have been proven in the industry. How to integrate CDMA high-performance wireless access technology with the excellent service capabilities of the mobile application part (MAP) core network in GSM is the operator ’s move to 3G. A flexible solution for evolution.

Now, in order to connect CDMA mobile terminals to the GSM core network, a new network node, Mobile Switching Node (MSN), is introduced, which is superimposed on the existing GSM network to complete the connection with the GSM core network and CDMA. Standard interface docking, and complete the corresponding signaling conversion work and business connection function. A CDMA network and a GSM network already exist in the prior art, and their network structures are shown in FIG. 1. In Figure 1, MSN102 is equivalent to the MSC in GSM, which completes the protocol conversion of the circuit. The A interface between CDMA base station 101 and MSN102 uses the CDMA IOS4.1 protocol specification, and the GSM core network 103 uses GSM-MAP messages. The network is called GSM l network. In general, the GSM lx network and the CDMA network are independent of each other. The mobile phone is connected to the GSM core network 103 through the CDMA base station 101 and MSN 102; the mobile phone is connected to the CDMA core network 106 through the original CDMA base station 104 and the CDMA MSC-CMSC105. In other words, it is not possible to share the original CDMA base station equipment between the GSM lx network and the CDMA network.

In this case, if a CDMA base station (BS) is added in order to implement the GSM lx network 101 and MSN102 to achieve CDMA mobile phone access to the GSM core network through a CDMA base station. The new network investment is huge. MSN and a large number of BSs must be added, and the construction period is long, which will obviously cause a lot of waste of resources. Summary of the invention

In view of this, the main purpose of the present invention is to provide a method for sharing a base station between a GSM network and a CDMA network, so as to realize that the GSM network and the CDMA network share the original CDMA base station equipment, thereby reducing the network construction cost and improving the system resource utilization rate.

To achieve the above object, the technical solution of the present invention is specifically implemented as follows:

A method for sharing a base station between a GSM network and a CDMA network. The method includes the following steps:

1) Set up a mobile switching node (MSN) between the GSM core network and the original CDMA base station (BS) in the CDMA network;

2) The MSN uses a multi-signaling point technology to perform voice transmission and signaling transmission between the MSN and the CDMA base station, and performs signaling transmission between the MSN and a mobile switching center (CMSC); The voice transmission is carried out through the original connection.

Step 2) may further include: configuring more than one signaling point in the MSN, and assigning each signaling link of the same destination signaling point to a different source signaling point. In addition, there is a case where the destination signaling point is the same as the source signaling point. The MSN messaging layer distinguishes between the processing according to whether the signaling originates from the MSN itself or other entities.

The method may further include, for the message containing the International Mobile Subscriber Identification Number (IMSI) received by the MSN from the BS, the MSN determines that the message is processed by the MSN or forwarded to the CMSC for processing according to the International Mobile Subscriber Identification Number (IMSI) in the message. .

'The method may further include that in the process of transmitting the connectionless message, the MSN directly forwards the connectionless message received from the CMSC to the BS; or The content in the connection message is processed by the MSN or forwarded to the CMSC for processing.

When the connectionless message transmitted is a circuit-related message, the MSN may directly forward the circuit-related message received from the CMSC to the BS; or the MSN may send the circuit-related message (CIC) in the circuit-related message received from the BS to the MSN. Processing or forwarding to CMSC for processing.

The method may further include that in the process of transmitting a connection message, the MSN creates a connection entry including a BS local reference number, an MSN local reference number, and a CMSC local reference number each time a connection is established, and interacts with subsequent connection messages In the process, the destination of the message is determined according to the local reference number in the entry.

The method may further include establishing a connection from the BS to the CMSC, and establishing a connection from the CMSC to the BS, using the segmented connection connection technology of the Signaling Connection Control Part (SCCP), which is divided into BS to MSN and MSN to CMSC. Connection segments, and the segmented connection here needs to be adapted to the MSN as a multi-signaling point entity with duplicate source and destination signaling points.

The process of establishing a connection from the BS to the CMSC is:

a. The BS sends a connection request to the MSN.

b. The MSN creates a connection entry, allocates and records a local reference number, and sends the request to the CMSC or the MSN for processing according to the IMSI in the request message;

c. The CMSC receives a connection request and sends a connection confirmation to the MSN.

d. The MSN sends a connection confirmation to the BS.

The process from the CMSC to the BS to establish a connection is:.

a. The CMSC sends a connection request to the MSN;

b. The MSN creates a connection entry and forwards the connection request to the BS.

c. After receiving the connection request, the BS sends a connection confirmation to the MSN.

d. The MSN sends a connection confirmation to the CMSC according to the local reference number in the entry.

The method may further include that in the process of transmitting the global message, the MSN After receiving the global message temporarily and processing it according to the global message, the processing result and the processing result of the CMSC are integrated into a global message and sent to the BS; or the MSN 4 processes the global message received from the BS and is processed by the MSN at the same time Send to CMSC for processing.

The method may further include: the signaling time slots of the original CMSC and CDMA BS are transferred to the connection between the CMSC and the MSN through data configuration.

As can be seen from the technical solution of the present invention, the method for sharing a base station between the GSM network and the CDMA network of the present invention adds an MSN device to the network, connects the MSN and CMSC to the BS at the same time, and adopts multiple signaling point technology to implement the GSM lx network. MSN and original CMSC of CDMA network share BS. Although a new MSN device is added to this method, the network can be built quickly without replacing the original device, which reduces the cost of network construction and improves the system resource utilization rate. In addition, the user services of the original CDMA network are unchanged, and the risk of network construction is small. Brief description of the drawings

FIG. 1 is a schematic diagram of a prior art GSM lx network and a CDMA network structure; FIG. 2 is a schematic diagram of a GSM lx network and a CDMA network structure according to a preferred embodiment of the present invention;

FIG. 3 is a schematic flowchart of establishing a connection between a BS and a CMSC in the embodiment shown in FIG. 2; FIG. 4 is a schematic flowchart of establishing a connection between a CMSC and a BS in the embodiment shown in FIG. 2. Mode of Carrying Out the Invention

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below with reference to the embodiments and the accompanying drawings.

The main method of the present invention is to add MSN, which is connected between the base station (BS) of the original CDMA network and the GSM core network, and uses the original CDMA base station to establish a GSM lx network, so that the GSM lx network and the CDMA network share the original CDMA BS. . FIG. 2 is a schematic diagram of a GSM lx network and a CDMA network structure according to a preferred embodiment of the present invention. In FIG. 2, thick solid lines indicate packet paths and signaling, thin solid lines indicate speech paths, and dashed lines indicate signalling. As shown in FIG. 2, MSN 202 and CMSC 203 are connected to CDMA BS 201 at the same time, but the connection between CMSC 203 and CDMA BS 201 has only a speech path and does not carry signaling. The connection between MSN 202 and CDMA BS 201 includes speech path and signaling . During the connection between CDMA BS 201 and the network, all signaling is sent to the connected MSN 202, and the MSN 202 is redistributed to or processed by the CMSC 203, and only the signaling is transmitted between the MSN 202 and the CMSC 203.

It can be seen from FIG. 2 that for the upgrade of the original CDMA network, the connection between the original CDMA BS and CMSC can be maintained, and the connection between the MSN and CDMA BS and the connection between the CMSC and MSN are newly added. The original CMSC and CDMA BS signaling time slots It can be changed to a new connection between CMSC and MSN through data configuration.

In view of the fact that the original CDMA BS is only connected to a CMSC through the A interface, the present invention adopts a multi-signaling point technology to implement the intervention of MSN, which is transparent to the original CMSC and CDMA BS, that is, the original CMSC and CDMA BS No replacement is required, only data modification and capacity expansion are needed. If the original CDMA network has redundant capacity, it can also only change the connection without capacity expansion.

Multi-signaling point technology is an existing technology. With the rapid development of mobile networks, the capacity of users has increased dramatically, and the processing capabilities of the network have become higher and higher. However, due to the International Telecommunication Union (ITU-T) specifications and national standards Currently, there are maximum limits on the number of links and the number of application sessions between two sites, that is, the number of links is <16, and the number of trunk sessions is <4096. Therefore, the industry has introduced the concept of multiple signaling points. On the premise of meeting the ITU-T specifications and national standards, it provides solutions for supporting large-capacity relays and high-traffic links between the offices. For each signaling point in the multiple signaling points, they each complete The function is the same as that performed by a signaling point. At the same time, for messages to the same destination, each signaling point can also load share services. In this way, multiple signaling points can be configured in a physical entity, and each of the signaling points with the same destination can be configured. The signaling link can belong to different source signaling points.

The newly added MSN entity in the embodiment of the present invention uses the multiple signaling point technology to ensure that the original equipment does not move. The multi-signaling point technology used here is slightly different from the standard multi-signaling point. The MSN must support the situation where the destination and source signaling points are duplicated. For the CMSC, the MSN is configured with signaling points representing all BSs under the jurisdiction of the original CMSC, and the number of signaling points is 1: 1 with the BS; for each BS, the MSN is configured with a signaling point representing the CMSC that governs this BS.

It is assumed that the signaling point of the original CDMA BS1 in this embodiment is 0xB1, the signaling point of the CDMA BS2 is 0xB2, the signaling point of the original CMSC is OxCC, and there are multiple entities such as a home location register (HLR) in the GSM core network. The signaling point allocated to the MSN by the core network is OxAA. It is assumed that the MSN distribution link is connected to CDMA BS1, CDMA BS2, CMSC, or HLR in the GSM core network. See Table 1. Table 1 is an example of signaling point configuration. The MSN needs to be configured with the source signaling point: OxCC, OxBl, 0xB2, OxAA, and the destination signaling point: OxBl, 0xB2, OxCC, where OxBl, 0xB2, and OxCC are the same. In the present invention, the MSN is used according to the signaling Originating from the MSN itself or other entities to distinguish between processing to avoid conflicts.

Table I

In this way, the original CMSC and CDMA BS signaling time slots can be changed to New connection.

The following describes the process of message distribution in the network in this embodiment in detail.

The MSN needs to distribute the messages from the BS to the MSN itself or the CMSC for processing. The messages sent from the CMSC must be processed by the MSN except for the global messages. Other messages are not processed by the MSN service layer. BS.

The messages that the MSN needs to transmit or process can be divided into three categories, and are allocated and processed according to the following principles:

The first type: call-related messages, which can be divided into connection-connected messages and connectionless messages from the signaling connection control part (SCCP) layer. A connection message refers to a message in which the front and back messages between two signaling entities can be related by a connection reference number. For a connection message, an SCCP connection must be established first, and the two parties allocate storage area to record related information, and use the local reference number as the storage record. The follow-up message carries the local reference number of the other party, and the other party can find the previous record. Generally, the connection message is used for the call, and the connection is removed only after the call ends. Different calls use different connections. Connectionless messages refer to messages that do not require SCCP to establish a connection to correlate a series of messages in the process. Generally, connectionless messages only need a short interaction, such as resetting a circuit.

In the message issued by the CMSC, the connectionless message can be directly forwarded to the BS via the MSN, and the connection message is processed by the MSN before being delivered. The MSN receives the message from the BS. Because the call-related connectionless message and the first message with the connection message both have IMSI, they can be distributed according to IMSI. Because the GSM core network and the original CDMA system use different numbers of IMSIs, for example, 46000xxxxxxxxxx is a GSM network, it is processed by MSN after receiving, 46003xxxxxxxxxx is originally CDMA, and MSN is forwarded to CMSC for processing. Subsequent messages that have a connection without IMSI can be recorded by the MSN with a local reference number and then distinguished.

Type 2: Circuit-related messages, such as blocking circuit messages, are SCCP connectionless messages. Messages issued by the CMSC can be directly transmitted to the BS by the MSN. MSNs receive messages from the BS and are distinguished by the MSN or the circuit identification number CIC. CMSC processing. The newly added MSN occupies a new CIC segment. For example, 0-319 of CDMA BS1 is the CIC connected to the CMSC and requires MSN to forward the CMSC for processing; 320-639 connected to the MSN is handled by the MSN itself. .

The third type: global messages, such as global reset, because from the perspective of the BS, MSN and CMSC need to be processed uniformly. There are two cases: (i) For receiving the global message sent by the BS, both the MSN and the CMSC must process it, and the message is sent to the MSN itself and the CMSC for processing. (ii) MSN does not actively send global messages. For global messages that CMSC sends to BS via MSN, MSN sends the MSN service layer to process them. MSN sends the MSN and CMSC processing to the BS in one message. There are two same global messages sent by MSN and CMSC to a BS at the same time.

The following specifically describes the SCCP layer local reference number with connection message. The first message with a connection message carries IMSI, and the subsequent messages do not include IMSI. There must be a mechanism to ensure message distribution. The local reference number can be recorded by MSN. Make a distinction.

According to specifications, the SCCP local reference number (source / destination) is set to a fixed three-byte length. In a network node-MSN or CMSC, the signaling connection is uniquely determined by the local reference number. This is an internal work number. It is determined by each node.

In this embodiment, the method for processing messages between CMSC and BS is similar to the segmented connection establishment technology of SCCP. However, since MSN supports multiple signaling points in an active signaling point (OPC) and destination signaling point (DPC) repetition mode. The processing is slightly different from the standard SCCP connection segment. The principle of standard SCCP segmentation is: signaling point A to signaling point C can be divided into signaling point A to B and signaling point B to C. The MSN is equivalent to the position of the signaling point B, but more than one signaling point is used, and there are overlaps between the OPC and DPC signaling points, and the processing is different. The CMSC sends a message to the BS with the local reference number assigned by the CMSC, and the message sent by the MSN is also assigned. If the local reference number of the CMSC is sent to the BS without processing, the MSN cannot be MSN or CMSC respectively. Therefore, the MSN has two segments at the SCCP layer for the message between the CMSC and the BS. The MSN processes the message and redistributes the local reference number uniformly. The processing method is as follows:

1. The message interaction between BS and MSN is consistent with the general SCCP connection message processing method.

2. The BS initiates a connection to the CMSC. For messages exchanged between the BS and the CMSC, the MSN also requires the allocation of a local reference number. The assigned local reference number is used for all messages that interact with multiple BSs and with the CMSC. In addition, the MSN must establish a table to record the local reference numbers of the BS and the CMSC, which are used for reference of subsequent messages.

In this way, refer to FIG. 3 for a process of establishing a connection from the BS to the CMSC. FIG. 3 is a schematic diagram of a process of establishing a connection from the BS to the CMSC in the embodiment shown in FIG. 2.

First, step 301BS sends a connection request to the MSN;

After receiving the request, the MSN performs the following processing:

Step 1: Create a new connection entry. The entry requirements include: BS local reference number (LR [BS]), MSN local reference number (LRN [MSN]), CMSC local reference number (LRN [CMSC]), and All initialized to empty.

Step 2: Assign and record the local reference number LRN [MSN], and record LRN [BS]. According to the IMSI in the connection request, determine whether the request is to be sent to the CMSC. If it is to be sent to the CMSC, replace the source local reference number (OLRN [BS]) with OLRN [MSN], and perform step 302 to send the request to the CMSC, otherwise That is, the message interaction between the BS and the MSN. After the MSN is processed, the connection is confirmed according to the specifications, which is indicated by a dashed line in the figure. The source local reference number refers to the local reference number of the message sender.

After the CMSC receives the connection request, perform step 303. The CMSC returns a connection confirmation. The MSN finds the stored record by LRN [MSN], then writes down the LRN [CMSC], reads LRN [BS], and replaces the original OLRN [CMSC] with OLRN [MSN. ], And then execute step 304 to send a connection confirmation to the BS.

In subsequent message processing, LR [BS] and LRN [MSN] are used during the interaction between BS and MSN; LRN [MSN] and LRN [CMSC] are used during the interaction between MSN and CMSC.

For subsequent messages without IMSI, you can check whether the LRN [CMSC] is valid. W to determine whether it is required to send to CMSC. If it is left blank (note that the entry is initialized to be empty when it is created), it is not sent to CMSC, and is processed by the MSN.

The process of establishing a connection from the CMSC to the BS is shown in FIG. 4 and FIG. 4 is a schematic flowchart of the process of establishing a connection between the CMSC and the BS in the embodiment shown in FIG. 2.

The process is the same as that sent by the BS to the CMSC, except that the message direction is reversed when the connection is established.

First, in step 401, the CMSC sends a connection request to the MSN.

Then, in step 402, the MSN forwards the request to the BS and creates a connection entry; after the BS receives the request, step 403 sends a connection confirmation to the MSN;

Finally, in step 404, the MSN sends a connection confirmation to the CMSC according to the local reference number in the entry.

Similarly, in subsequent message processing, during the interaction between the BS and the MSN, the local reference numbers are LRN [BS] and LR [MSN], and during the interaction between the MSN and the CMSC, the local reference numbers are LRN [MSN] and LRN [CMSC〗 .

For subsequent messages without IMSI, you can also determine whether to send to the CMSC by checking whether there is an LRN [CMSC]. If it is left blank (note that the entry is initialized to be empty when it is created), it is not sent to the CMSC. Handled by this MSN.

It can be seen from the foregoing embodiments that the GSM network and the CDMA network of the present invention share a base station method, which realizes that the MSN in the GSM network and the original CMSC in the CDMA network share the BS. Although a new MSN device is added, it does not You can quickly build a network by replacing the original equipment. The user service of the original CDMA network is unchanged, the network construction risk is small, the network construction cost is reduced, and the system resource utilization rate is improved. If the BS expands in the future, both GSM and the original CDMA network can share the expansion.

Claims

Claim

1. A method for sharing a base station with a global mobile communication network (GSM) and a code division multiple access (CDMA) network, characterized in that the method includes the following steps:

1) Set up a mobile switching node (MSN) between the GSM core network and the original CDMA base station (BS) in the CDMA network, and establish the MSN and CDMA mobile switching center

(CMSC) connection;

2) The MSN uses a multi-signaling point technology to perform speech and signaling transmission between the MSN and the CDMA base station, and performs signaling transmission between the MSN and the CMSC; Connect for voice transmission.

2. The method according to claim 1, wherein: said step 2) further comprises: configuring more than one signaling point in the MSN, and allocating each signaling link of the same destination signaling point to a different source Signaling point.

3. The method according to claim 2, characterized in that: when the destination signaling point in the MSN is the same as the source signaling point, the MSN distinguishes the processing according to the signaling source.

4. The method according to claim 1, characterized in that: the method further comprises: for the message containing the International Mobile Subscriber Identity (IMSI) received by the MSN from the BS, the MSN identifies the international mobile subscriber according to the message. The number (IMSI) is determined to be processed by the MSN or forwarded to the CMSC for processing.

5. The method according to claim 1, further comprising: in the process of transmitting the connectionless message, the MSN directly forwards the connectionless message received from the CMSC to the BS; or the MSN receives the message from the BS according to The content in the connectionless message is processed by the MSN or forwarded to the CMSC for processing.

6. The method according to claim 5, further comprising: when the connectionless message transmitted is a circuit related message, the MSN receives the circuit related information received from the CMSC. The message is directly forwarded to the BS; or the MSN is processed by the MSN or forwarded to the CMSC for processing according to the circuit identification number (CIC) in the circuit-related message received from the BS.

7. The method according to claim 1, further comprising: in the process of transmitting a connection message, the MSN creates a BS local reference number, an MSN local reference number, and a CMSC local each time a connection is established. The reference number of the connection entry determines the destination of the message to be sent according to the local reference number in the entry during the subsequent connection message interaction process.

8. The method according to claim 7, further comprising: establishing a connection to the CMSC from the BS and establishing a connection from the CMSC to the BS by using a signaling connection control part (SCCP). Segment construction connection technology is divided into two connection segments, BS to MSN, MSN to CMSC,

The process of establishing a connection from the BS to the CMSC is:

a. The BS sends a connection request to the MSN.

d. The MSN sends a connection confirmation to the BS.

The process from the CMSC to the BS to establish a connection is:

a. The CMSC sends a connection request to the MSN;

9. The method according to claim 1, further comprising: in the process of transmitting a global message, the MSN temporarily receives the global message from the CMSC and processes the global message according to the global message, and then processes the processing result with the global message. The processing result of CMSC is integrated into a global message The MSN sends the message to the BS; or the MSN sends the message to the MSC for processing according to the global message received from the BS.

10. The method according to claim 1, further comprising: transferring the signaling time slots of the original CMSC and the CDMA BS to the connection between the CMSC and the MSN through data configuration.