KR20010011529A - Apparatus for processing of layer-3 protocol between nonsynchronous UTRAN and synchronous CN - Google Patents

Abstract

PURPOSE: An apparatus of processing a layer3 protocol for handoffs between an asynchronous UTRAN(UMTS(universal mobile telecommunications system) terrestrial radio access network) and a synchronous CN(core network) is provided to newly define each protocol in the asynchronous UTRAN and to supply a function of a mapping entity for message mapping between a radio access network application part(RANAP) and an IS-634, so as to interwork the synchronous CN using an IS-41 with the asynchronous UTRAN. CONSTITUTION: A synchronous protocol processor(10) processes a synchronous protocol. A mapping entity(20) maps or generates a message and a parameter between a radio access network application part(RANAP)(30) and a synchronous system, by using parameters supplied from each supporting entity(61) in a lower layer. A radio resource controller(RRC)(40) connected with the mapping entity(20) and the RANAP(30) controls radio resources. A radio link controller(RLC)(50) connected to the RANAP(30) controls a wireless link. A medium access controller(MAC)(60) connected to the mapping entity(20) and the RRC(40) controls a medium access with a physical layer which is a lowest layer.

Description

{Apparatus for processing of layer-3 protocol between nonsynchronous UTRAN and synchronous CN} for handoff between asynchronous UTI and synchronous CNEN

The present invention relates to a Layer-3 protocol processing apparatus for handoff of asynchronous and synchronous systems in a mobile communication system (especially an IMT-2000 system).

In general, mobile communication systems are roughly classified into synchronous mobile communication systems and asynchronous mobile communication systems, among which synchronous mobile communication systems interface data according to IS standards (IS-95, IS-41, IS-634). The mobile communication system interfaces data according to the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (UMTRA) standard.

FIG. 1 is a diagram illustrating a hard handoff procedure between synchronous systems. In order to perform handoff in a synchronous mobile communication system, FIG. 1 follows a procedure defined in IS-634.

Here, reference numeral 1 denotes a mobile station (MS), 2 denotes a source BS, 3 denotes a mobile communication exchange (MSC), and 4 denotes a target BS.

First, when the mobile station 1 crosses the network boundary, the signal strength of the mobile station 1 received by the source base station 2 is equal to or less than a specific value (preset threshold), in which case the source base station 2 is connected to the mobile communication exchange. In step (3), a handoff request message (Handoff Required) is transmitted. The mobile communication exchange 3 receiving the handoff request message sends a handoff request message to the target base station 4 to request hard handoff. The target base station 4, which has received a hard handoff request, determines a radio resource and transmits a handoff request acknowledgment message (Handoff Request Ack.) To the mobile communication exchange 3 that has requested the hard handoff. 3) transmits a handoff command message (Handoff Command) to the source base station (2). The source base station 2 receiving the handoff command message transmits a handoff direction message to the mobile station 1, and transmits a handoff completion message to the mobile communication switch 3. The mobile communication exchange 3 receiving the handoff complete message transmits a handoff complete message (Handoff Complete) to the target base station 4, and at the same time, a clear command message for releasing the radio connection to the source base station 2 ( Clear Commend). The source base station receiving the clear command message releases the radio resource, and then terminates the hard handoff by transmitting a resource complete message (Clear Complete) to the mobile switching center 3.

FIG. 2 illustrates a hard handoff procedure in a conventional asynchronous system. The hard handoff procedure follows the procedure set forth in GSM 08.08 (Ver5.9.9).

Here, reference numeral 5 denotes a mobile station (MS), 6 denotes a source base station (Source BS), 7 denotes a mobile communication exchange (MSC), and 8 denotes a target BS.

First, when the mobile station 5 crosses the network boundary, the signal strength of the mobile station 5 received by the source base station 6 becomes equal to or less than a specific value (preset threshold), and in this case, the source base station 6 changes the mobile communication exchange. In step 7, a handoff request message (Handoff Required) is transmitted. The mobile communication exchange 6 receiving the handoff request message sends a handoff request message to the target base station 8 to request hard handoff. The target base station 8 having received the hard handoff request determines a radio resource and transmits a handoff request acknowledgment message (Handoff Request Ack.) To the mobile communication exchange 7 that has requested the hard handoff. 7) transmits a handoff command message (Handoff Command) to the source base station (8). The source base station 6 receiving the handoff command message transmits a handoff direction message to the mobile station 5, and transmits a handoff completion message to the mobile communication switch 7. In addition, the target base station 8 transmits a handoff complete message (Handoff Complete) to the mobile switching center (7), the mobile communication exchange 7 received this to release the radio connection to the source base station (6) Send a clear command message (Clear Commend) The source base station receiving the clear command message releases radio resources, and then terminates the hard handoff by transmitting a resource complete message (Clear Complete) to the mobile communication switch 7.

In such synchronous and asynchronous systems, there is no problem in hard handoff between synchronous systems or between asynchronous systems. However, in order to perform a hard handoff to an synchronous system, the asynchronous UTRAN maps or generates messages and parameters used in an IS-41 network. You need separate hardware and software to do this.

Therefore, the present invention has been proposed to smoothly perform the hard handoff from the asynchronous system to the synchronous system as described above,

An object of the present invention is to provide a Layer-3 protocol processing apparatus for handoff of asynchronous and synchronous systems in a mobile communication system (especially an IMT-2000 system). .

The present invention for achieving the above object,

In the UTRAN consisting of a mobile station, a base station and a control station, and an asynchronous mobile communication system comprising an asynchronous switching station,

The control station,

A synchronous protocol processor for processing a synchronous protocol;

A mapping entity unit connected to the synchronous protocol processing unit and mapping or generating a message and a parameter between a radio access network application unit and a synchronous system using parameters provided by each supporting entity unit in a lower layer;

A radio resource controller connected to the radio access network application unit and the mapping entity unit to control radio resources;

A radio link control unit located below the mapping entity unit and connected to the radio resource control unit to control a radio link;

And a medium access control unit connected to the radio link control unit and controlling a medium access to the lowest physical layer.

The control station further comprises a radio network subsystem application unit connected to the radio resource control unit and interfacing data with the radio network subsystem application unit in the base station.

1 is a view showing a hard handoff procedure between a conventional synchronous mobile communication system,

2 is a view showing a hard handoff procedure between conventional asynchronous mobile communication systems,

3 is a block diagram of a layer 3 protocol processing apparatus for handoff between an asynchronous UTRAN and a synchronous CN according to the present invention;

4 is a diagram illustrating a state in which the layer 3 protocol processing apparatus of FIG. 3 is applied to an actual asynchronous mobile communication system.

FIG. 5 is a detailed configuration diagram of a supporting entity unit for interworking between synchronous and asynchronous mobile communication systems in FIG. 3.

<Explanation of symbols for main parts of drawing>

10: synchronous protocol processing unit

20: mapping entity unit

30: radio access network application unit

40: radio resource control unit

50: wireless link control unit

60: medium access control unit

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above in detail.

3 is a block diagram of a layer 3 protocol processing apparatus for handoff between an asynchronous UTRAN and a synchronous CN according to the present invention.

Here, reference numeral 10 denotes a synchronous protocol processor for processing a synchronous protocol, and 20 denotes a wireless access network application unit 30 connected to the synchronous protocol processor 10 and using parameters provided by each supporting entity unit in a lower layer. (RANAP: a mapping entity unit for mapping or generating a message and a parameter between a Radio Access Network Application Part) and a synchronous system, and reference numeral 40 is connected to the mapping entity unit 20 and the radio access network application unit 30. Radio resource controller (RRC) for controlling radio resources.

In addition, reference numeral 50 is a radio link controller (RLC: Radio Link Controller) connected to the mapping entity unit 20 and controlling a radio link, and 60 is the mapping entity unit 20 and the radio resource controller 40. A medium access controller (MAC) that controls media access to the physical layer, which is the lowest layer, in connection with the.

The control station in the asynchronous system according to the present invention having such a configuration interfaces the data between the synchronous system and the asynchronous system in the synchronous protocol processing section 10.

The mapping entity unit 20 is a supporting entity unit 41 in the radio resource control unit 40, which is a lower layer when the synchronous protocol processing unit 10 is connected to the synchronous system, and a supporting entity unit in the radio link control unit 50 ( 51), using the parameters provided by the supporting entity unit 61 in the media access control unit 60, a message or parameter is mapped or generated between the radio access network application unit 30 and the synchronous system.

Here, the functions performed by the mapping entity unit 20 will be described in more detail as follows.

There is a cell parameter mapping function for mapping system and cell identifier list parameters, and cell configuration parameters. Also, mobile station parameter mapping functions for mobile station identification parameter mapping, existing parameter mapping, service option and configuration parameter mapping, and cell parameter mapping. There is this.

In addition, there is a channel parameter mapping function for handoff parameter mapping, wireless channel parameter mapping, power control parameter mapping, and the like, and a ciphering parameter mapping function for state guide parameter mapping.

Next, the radio resource controller 40 provides a parameter in the supporting entity unit 41 so that the mapping entity unit 20 can map and generate a message and a parameter between the RANAP and the IS-634. Connected to the application unit 30 performs a function of controlling a radio resource.

In addition, the radio link controller 50, which is a lower layer of the radio resource controller 40, supports the entity entity 51 to map and generate messages and parameters between the RANAP and the IS-634 in the mapping entity unit 20. Provides a parameter and is connected to the radio resource controller 40 to control a radio link.

Next, the medium access control unit 60 is the same layer as the radio link control unit 50 and is connected to the radio resource control unit 40 to control the medium access to the physical layer, which is the lowest layer, and the mapping entity unit. In (20), the supporting entity unit 61 provides parameters so that mapping and generation of messages and parameters between the RANAP and the IS-634 are possible.

4 shows an example in which a control station having a protocol structure as described above is implemented in an actual asynchronous system.

Here, reference numeral 100 denotes a mobile station, 200 denotes a base station (BS), and 300 denotes a control station (RAN).

The mobile station 100 (user equipment: UE) includes a radio resource control unit 101 as an upper layer, a radio link control unit 102 as a lower layer, and a medium access control unit 103, and a physical layer unit 103 as a lower layer. ) To interface data with the base station wirelessly.

The base station 200 includes a radio network subsystem application unit 201 (RNSAP) for a control station 300 and a radio network application as a top layer, and includes a radio link control unit 202 and a medium access control unit 203 as a lower layer. And a physical layer unit 204 as the lowest layer, and wirelessly interface data with the mobile station 100, and interface data with the control station 300 by wire.

Next, the control station 300 is connected to the synchronous protocol processing unit 301 and the synchronous protocol processing unit 301 for processing the synchronous protocol as is well known, using parameters provided by each supporting entity unit in the lower layer. A mapping entity unit 302 for mapping or generating a message and a parameter between a radio access network application unit 303 (RANAP: Radio Access Network Application Part) and a synchronous system, and the mapping entity unit 302 and the radio access network application. A radio resource controller 304 (RRC: Radio Resource Controller) connected to the unit 303 to control radio resources, and a radio link controller (RLC) connected to the mapping entity unit 302 to control a radio link. 305, a medium connected to the mapping entity unit 302 and the radio resource control unit 304 to control a medium access to a physical layer that is the lowest layer And a: (Medium Access Controller MAC) (306), the physical layer 307 and the transport layer 308 near the control unit.

Among them, the mapping entity unit 302 enables the mapping and generation of messages and parameters between the RANAP and the IS-634 using the parameter information obtained from each of the supporting entity units 305a, 306a, and 307a, as is well known. Do this.

5 shows a protocol stack of each supporting entity in an asynchronous control station for interworking between an asynchronous UTRAN and a synchronous CN. As shown in the figure, Layer 1, Layer 2, Layer 3, MM (Mobility Management), CC (Call Control) and GSM-MAP protocol stack, and the extension that performs the mapping function to work with the synchronous CN, its function It is equipped with hook which provides environment to support. Here, extension and hook were proposed in May 1999 with the concept of defining functions required for each protocol layer in an asynchronous UTRAN for interworking between an asynchronous UTRAN and a synchronous CN at an OHG conference.

As described above, according to the present invention, the IS protocol is newly defined in the asynchronous UTRAN for hard handoff between the asynchronous UTRAN and the synchronous CN, and the function of the mapping entity for message mapping between the RANAP and the IS-634 is provided. It is possible to interwork between a synchronous CN using -41 and a UTRAN using an asynchronous method.

In addition, there is an advantage that the asynchronous subscriber can use the service provided by the synchronous CN without changing the system structure.

Claims (7)

In the UTRAN consisting of a mobile station, a base station and a control station, and an asynchronous mobile communication system comprising an asynchronous switching station, The control station, A synchronous protocol processor for processing a synchronous protocol; A mapping entity unit connected to the synchronous protocol processing unit and mapping or generating a message and a parameter between a radio access network application unit and a synchronous system using parameters provided by each supporting entity unit in a lower layer; A radio resource controller connected to the radio access network application unit and the mapping entity unit to control radio resources; A radio link control unit located below the mapping entity unit and connected to the radio resource control unit to control a radio link; And a medium access control unit connected to the radio link control unit and controlling a medium access to a physical layer unit, which is the lowest layer, for the asynchronous UETI and the synchronous CNEN handoff. The method of claim 1, wherein the mapping entity unit, Mapping of system and cell identifier list parameters, mapping of cell parameters for mapping of cell configuration parameters; Mobile station parameter mapping function for mobile station identification parameter mapping, existing parameter mapping, service option and configuration parameter mapping, and cell parameter mapping; Channel parameter mapping function for handoff parameter mapping, wireless channel parameter mapping, power control parameter mapping, and the like; Layer 3 protocol processing device for asynchronous UE and synchronous CNEN handoff, characterized in that it performs a ciphering parameter mapping function for state guide parameter mapping. The method of claim 1, wherein the radio resource control unit, Layer 3 protocol processing for asynchronous UE and synchronous CNEN handoff, characterized in that the mapping entity unit comprises a supporting entity unit for providing a parameter to enable mapping or generation of messages and parameters between RANAP and IS-634. Device. The method of claim 1, wherein the radio link control unit, Layer 3 protocol processing for asynchronous UE and synchronous CNEN handoff, characterized in that the mapping entity unit comprises a supporting entity unit for providing a parameter to enable mapping or generation of messages and parameters between RANAP and IS-634. Device. The method of claim 1, wherein the medium access control unit, Layer 3 protocol processing for asynchronous UE and synchronous CNEN handoff, characterized in that the mapping entity unit comprises a supporting entity unit for providing a parameter to enable mapping or generation of messages and parameters between RANAP and IS-634. Device. The method of claim 1, wherein the physical layer unit, Layer 3 protocol processing for asynchronous UE and synchronous CNEN handoff, characterized in that the mapping entity unit comprises a supporting entity unit for providing a parameter to enable mapping or generation of messages and parameters between RANAP and IS-634. Device. The method of claim 1, wherein the control station, And a wireless network subsystem application unit connected to the radio resource control unit and interfacing data with the wireless network subsystem application unit in the base station, and a transport layer unit for performing data transmission. Layer 3 protocol processing unit for synchronous one-way handoff.