KR20060065349A - A structure of tight-coupling ip signalling in cellular telecommunication systems, and a method thereof - Google Patents

Abstract

The present invention relates to an IP signaling integration structure and method in a cellular mobile communication system. In the cellular mobile communication system according to the present invention, the IP-based integrated structure includes an IP routing capability and an entity (PDSN in 3GPP2, GPRS (SGSN / GGSN) in 3GPP) for connecting to a base station and IP World (existing packet domain). One radio access gateway controlling an IP (v4 or v6) subnet for which entities are governed; And a mobile terminal connected to a core network through the wireless gateway, wherein the wireless access gateway is based on the IP (v4 or v6) core network, and the constituent nodes in the cellular structure are operated on the IP. According to the present invention, on the premise that all infrastructures up to the core network are all IPized, a tight-coupling structure with a wired IP layer is proposed to support handover of a mobile terminal, and a wireless access technology of a cellular mobile communication system is proposed. By using the system information transmission feature of the mobile terminal, the handover of the mobile terminal can be more easily supported, and the IP detection time, which is one of the delay factors generated on the IP during the handover of the mobile terminal, is shortened. Handover delay can be reduced.

Mobile communication, general wireless conversion layer, wireless control protocol, handover, IP signaling

Description

A structure of tight-coupling IP signaling in cellular telecommunication systems, and a method

1 is a diagram illustrating an integrated structure of a cellular mobile communication system and an IP world according to an embodiment of the present invention.

2 is a diagram illustrating a protocol stack in an integrated structure according to an embodiment of the present invention.

3 is a diagram illustrating an example of an interface between a wireless control protocol and a middle wireless conversion layer as middleware in an integrated structure according to an embodiment of the present invention.

4 is a diagram illustrating connectionless layer information in an integrated structure according to an embodiment of the present invention.

5 and 6 are diagrams illustrating flow classification and processing techniques in an integrated structure according to an exemplary embodiment of the present invention.

7A and 7B illustrate a handover processing technique in an integrated structure according to an embodiment of the present invention.

The present invention relates to an IP signaling integration structure and method in a cellular mobile communication system, and more particularly to a cellular mobile communication system, for example, Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), EV- The present invention relates to an IP signaling integration structure and method in a cellular mobile communication system integrating an IP world and a conventional base station structure based on DO (Evolution Data Only (DV)) Wideband CDMA (WCDMA)-(HSDPA (High Speed Downlink Packet Access)).

The existing cellular mobile communication system is designed to be connected to the packet domain and the circuit domain, but the influence of IP World is increasing, so it is moving to the packet domain-oriented service rather than the circuit domain, and even the means of delivery in the base station is ATM (Asynchronous). The transition to IP (Internet Protocol) in the transfer mode (IP) is becoming a trend all IP.

However, in the existing cellular mobile communication system, the IP signaling and the radio signaling are completely separated from each other. In the call setup process, the radio signaling is completed after the completion of the radio signaling. As such, this signaling inevitably introduces delays and losses in handover of the mobile terminal.

On the other hand, as a prior art, Korean Patent Application No. 2001-16416 has the invention of the name of "wireless access gateway device and method for accessing IP packet based core network in IMT-2000 mobile communication network and a wireless data service system using the same" Is disclosed.

The above-described invention provides a packet service and all Internet networks provided by a subscriber of a second generation CDMA mobile communication network, a second generation PCS mobile communication network, and a third generation synchronous CDMA2000 mobile communication network in a third generation IMT-2000 IP based core network. The present invention relates to a wireless access gateway device structure and protocol implementation method for accessing an IP packet-based core network in an IMT-2000 mobile communication network capable of providing access, and to a wireless data service system using the same. A first gateway unit for performing a wireless data service with a third generation and a fourth generation or more wireless access network; And a second gateway unit configured to perform a wireless data service between the IP based core network and a second generation and 2.5 generation wireless access network, wherein the wireless data service comprises an IP based packet service. Protocol conversion, inter-protocol interworking, and interface for performing each function are made through API functions, so that existing wireless subscribers can reduce service costs by differentiating line-based voice and packet-based voice. By integrating various types of wireless Internet packet services into IP-based packet services, efficient packet data services can be provided, and IP-based networks can maintain the economics of second-generation and 2.5-generation mobile communication networks. Reuse of second and second generation networks It is possible to maximize and provide a structure that can access all future access networks as a network evolution friendly structure.

The evolutionary direction suggested by the preceding invention is very similar to the B3G base station under design, but has a strong loose coupling characteristic that allows the mobile communication system to be combined as it is.

Furthermore, Korean Patent Application No. 2002-11085 discloses an invention entitled "Handoff Method Applying Connection Setup Protocol in Integrated Internet Protocol Network".

The preceding invention connects existing control station equipment by adding an Internet protocol, and uses a Session Control Manager (SCM) to smoothly evolve and handoff to an integrated Internet protocol network. The present invention relates to a handoff method using a connection establishment protocol in an integrated Internet protocol network. In addition, by connecting the connection between the existing control station equipment by imposing an IP, the portion connected to the existing ATM is replaced, and by using the session control manager (SCM) unit, the use of the mobile communication exchange is removed. In addition, as a part for interworking with the existing network, a mobile station that is not registered in the AAA can immediately go to the mobile switching center and interwork with another network or PSTN network, thereby gradually evolving from the existing network to the integrated IP network. I would have to.

The evolutionary direction suggested by the above-described invention is one method that can be used in an ATM base station.

An object of the present invention is to tightly-coupling with a wired IP layer to support handover of a mobile terminal under the premise that all infrastructures including the base station of the conventional cellular mobile communication system are all IPized. The present invention provides a structure and method for integrating IP signaling in a cellular mobile communication system that supports handover of a mobile terminal more easily by using the structure and features of system information transmission of the wireless access technology of the cellular mobile communication system.

Another object of the present invention is to modify the signaling message of the IP layer during the system information transmission, which is a general feature of the radio access technology, and to broadcast it again in a radio frame period, which is one of delay factors generated on IP during handover of a mobile terminal. It is to provide an IP signaling integration structure and method in a cellular mobile communication system for reducing handover delay time of a mobile station by reducing IP detection time to support seamless and lossless handover. .

As a means for achieving the above object, in the cellular mobile communication system according to the present invention, the IP-based integrated structure, in the cellular mobile communication system,

Entity (PDSN in 3GPP2, GPRS (SGSN / GGSN) in 3GPP) for connecting to base station and IP World (existing packet domain) to control IP routing capability and IP (v4 or v6) subnet that the entities have jurisdiction over A wireless access gateway; And

Mobile terminal connected to the core network through the wireless gateway

Including,

The wireless access gateway is based on the IP (v4 or v6) core network, characterized in that the constituent nodes in the cellular structure operate over IP.

In addition, the IP signaling integration method in a cellular mobile communication system according to the present invention,

a) invoking other protocols (NBAP, RANAP, RNSAP, etc.) except for the radio control protocol (RRC in 3GPP); And

b) connecting the radio control protocol and the IP by the general radio conversion layer at the radio access gateway, leaving only the radio control protocol.

Including but not limited to:

In the strong coupling structure and protocol stack of the radio control protocol and IP, the mobility, QoS, and paging functions provided by IPv6 in the case of IPv6 can be directly mapped to the radio control protocol through a general wireless conversion layer.

In addition, the IP signaling integration method in a cellular mobile communication system according to the present invention,

a) acquiring synchronization by a synchronization channel of a mobile terminal and receiving system information through a broadcast channel (BCH) of the mobile terminal;

b) transmitting, at the mobile terminal, a CONN_ESTABLISH_REQ primitive from the general wireless conversion layer to the radio control protocol layer, and transmitting a random access message including a terminal unique identifier of the radio control protocol to the base station;

c) A base station radio control protocol layer performing a radio bearer setup procedure for a signal of a radio control protocol and receiving a CONN_ESTABLISH_REQ through a configured signaling radio bearer (SRB) interprets the meaning and requests a traffic radio bearer with CONN_ESTABLISH_IND. step;

d) the general wireless translation layer of the base station responds to the radio control protocol with CONN_ESTABLISH_RSP, and the CONN_ESTABLISH_RSP means that the base station radio control protocol performs a procedure for establishing a radio bearer for traffic;

e) when the radio bearer for traffic is established by the radio control protocol between the base station and the mobile terminal, the mobile terminal radio control protocol layer uploading CONN_ESTABLISH_CNF to the mobile terminal general wireless conversion layer;

f) A path for IP signaling between the mobile station and the base station is secured so as to freely transmit IP signaling (DATA_TRANSFER_REQ / IND), and a radio bearer is provided for traffic transmission, and through this radio bearer, an IP signal is transmitted from the base station. Transmitting and receiving from the terminal to the base station;

g) If the service is actually performed by IP signaling, one more radio bearer may be set up for the traffic, but the general radio translation layer in the base station may be used to use the radio bearer for the traffic together with the IP signaling and the actual service traffic. Transmitting and receiving RB_ESTABLISH_REQ / IND between radio control protocol layers;

h) rebalancing the QoS of the radio bearer so that service traffic can also be transmitted and received between the base station and the mobile terminal, and simultaneously transmitting and receiving IP signal traffic and service traffic to the radio bearer; And

i) Determination of a handover to move from a mobile station to another cell is possible by receiving information collected from a base station radio access protocol, and this information is obtained through a measurement control functional entity (MCFE) in a base station radio access control protocol. Delivered to the MCFE, the radio access control protocol of the mobile station, which receives the mobile terminal to enable the L2 trigger on the IP by raising the MESEAREMENT_IND to the radio access conversion layer;

Including a handover when the mobile station moves to another cell, characterized in that applied.

Hereinafter, an IP signaling integration structure and method in a cellular mobile communication system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, an overview of an integration structure for presenting an IP signaling integration method in a cellular mobile communication system according to an embodiment of the present invention will be described.

(Ⅰ) Outline of the Integrated Structure

As shown in FIG. 1, an entity for connecting to a base station and an IP world (existing packet domain) in a conventional mobile communication system (PDSN in 3GPP23 (the 3th Generation Partnership Project; CDMA-2000 standardization organization), GPRS (SGSN)). / GGSN) in 3GPP (WCDMA Standardization Organization) simplifies the structure of one radio access gateway that controls IP routing capabilities and the IP (v4 or v6) subnets that it manages. RTS) functions as a subset of BSC (or RNC).

That is, FIG. 1 illustrates the evolution of cellular cellular communication system into a structure based on an IP (v4 or v6) core network. FIG. 1 illustrates a structure of previous cellular structures (eg, BTS / RNC, BTS / BSC, SGSN / The configuration nodes in the GGSN and PDSN have been changed to a simple structure of a radio access gateway operating on IP.

As shown in FIG. 2, the structural change of FIG. 1 is different from the existing mobile communication system protocol except for a radio control protocol (eg, RRC (Radio Resource Control) in 3GPP). NBAP, RANAP, RNSAP, etc.) is made possible by the general wireless conversion layer in the radio access gateway for the connection between the radio control protocol and IP, leaving only the radio control protocol. In the strong coupling structure and protocol stack of the radio control protocol and IP, the mobility, QoS, and paging functions provided by IPv6 can be directly mapped to the radio control protocol through the general wireless conversion layer in the case of IPv6.

2 shows a cellular mobile communication system and an IP (v4 or v6) have direct interconnection. Although the protocol stack complies with the radio control protocol function of the existing cellular mobile communication, in terms of user plane and control plane, interworking function between IP and general wireless conversion layer should be added. The general wireless translation layer refers to middleware between a specific mechanism of a cellular mobile communication system for an access network and an IP (v4 or v6) based mechanism.

(Ⅱ-1) General wireless conversion layer in integrated structure

The general wireless conversion layer supports an interface of a specific mechanism of a cellular mobile communication system for an access network and an IP (v4 or v6) mechanism for user traffic and signaling. This is an implementation that extends standard IP (v4 or v6) network device drivers.

As shown in the upper part of FIG. 3, when the IP packet arrives at the general wireless conversion layer, the packets pass through a classfire that distinguishes the signaling packet marked for the control plane and the data packet marked for the user plane. Through some processing, the signaling packet may be mapped down to a specific SAP (Service Access Point) according to the characteristics of the packet, or may be directly mapped to SAP and passed along the signaling path. Data packets passing through the user plane are forwarded to the corresponding radio bearer.

In the case of multiple calls, there are several radio bearers for traffic packets entering the general wireless conversion layer, so a mechanism for selecting them is needed. In this case, it is necessary to additionally map the traffic and the radio traffic bearer by using the information from the setup information (the IP address and the service port of the corresponding node) during the call setup process of the upper protocol, not the simple IP routing.

The control plane of the general wireless conversion layer uses a service access point (SAP) to communicate with the radio control protocol of a cellular mobile communication system. There are three types of these SAPs: General Control SAP, Announcement SAP, and Dependent Control SAP.

4 shows a mapping relationship between a general wireless access layer and a radio control protocol of a cellular mobile communication system, and shows an example of mapping with an RRC function of 3GPP. This concept is similar to the radio control protocol of all cellular mobile communication systems.

(1) General Control Service Connection Point (GC): Provides system information broadcast service. It is used to enable informative IP network entities and to provide mobile terminals with commands not associated with a particular user. This general control service broadcasts information to all terminals in the cell area.

(2) Notification Service Connection Point (Nt: Notification SAP): Provides paging and notification broadcast services. Such information is broadcast in the cell area, but does not address a particular terminal.

(3) Dedicated Control SAP (DC): Provides a service for setting / release of one connection. A connection is a relationship with a temporary context when viewed from a wireless access gateway.

(Ⅱ-2) Radio Control Protocol in Integrated Architecture

(II-2.1) General Procedure

It describes how the standard RRC (Radio Resource Control) is modified and implemented to replace the radio control protocol function with IP (v4 or v6) functions. The radio control protocol layer coordinates the control plane signaling of layer 3 between the mobile terminal (MT) and the radio access gateway. The radio control protocol message carries all the parameters for setting up, modifying and releasing layer 2 and layer 1 protocol entities. In addition, radio control protocol messages carry their payload with higher layer signaling. A subset of radio control protocols defined to comply with the requirements of tight coupling with IP (v4 or v6) is shown at the bottom of FIG.

General wireless transformation layer interface via GC, Nt, DC SAP

BCFE: Broadcast Control Functional Entity

PNFE: Paging and Notification Functional Entity

DCFE: Dedicated Control Functional Entity

MCFE: Measurement Control Functional Entity

Configuration Control for PHY, MAC, RLC, PDCP Protocol Entities

AM, UM, and Tr are SAPs for RLC entities that handle signaling radio bearers (signalling RBs). A radio bearer (RB) available for radio control protocol message transmission may be defined as a radio bearer for signaling. The radio control protocol entity selects one of three signaling radio bearers (sRBs: RLC-Tr, RLC-UM, RLC-AM) for its own message. Additional signaling radio bearers (sRBs) are reserved for radio control protocol messages to carry higher layer (NAS) messages.

The interworking function between mobile station MT to IP (v4 or v6) builds, decodes and forwards messages exchanged with the general wireless conversion layer.

(II-2.2) BCFE: IP (v4 or v6) signaling broadcast in the subnet

The purpose of the BCFE is to handle the broadcast of system information from a wireless access gateway to a mobile station (MT) in a cell. This system information is broadcast in the SIB as defined by the cellular mobile communication system.

In the embodiment of the present invention, data for IP signals received from the general wireless conversion layer may be broadcast in a cell. Specific IP signal data can be mapped and broadcast to any type of SIB.

(II-2.3) PNFE: IP (v4 or v6) Paging

The radio control protocol layer may broadcast broadcast paging information to a selected mobile terminal (MT) in the network. As paging is performed at the IP level, paging request packets are forwarded without processing on the air interface. The PAGING_REQ primitive at the radio access gateway and the NOTIFICATION_IND primitive at the mobile station (MT) carry the actual IP paging packets over the Nt-SAP.

(Ⅲ) Wireless broadcast technology for handover and automatic configuration

In the wireless access gateway, the general wireless conversion layer intercepts IP (v4 or v6) Router Advertisement messages. This message contains a list of neighboring wireless access gateways. This message is intercepted during the IP packet marking check at the top of FIG. 3, encoded into a system information transport block, and transmitted to the wireless control protocol as a general control service connection point. The radio control protocol broadcasts the router broadcast information in a single cell.

The wireless control protocol of the terminal receives the system information, and if the system information is encoded, restores the router broadcast message through decoding and sends the information to the upper IP stage. The wired IP of the terminal may receive the router broadcast information and restore the network prefix of the cell. In the case of IPv6, stateless auto-configuration, an IP-specific feature, is used to determine its local IP (v6) link and CoA. In the case of IPv4, CoA information is broadcast in router broadcast information. The list of neighboring radio access gateways may be used by the mobile station (MT) to select a candidate for potential handover decision.

For example, 3GPP in the cellular mobile communication system, the Broadcast Control Function Entity (BCFE) of 3GPP is a functional entity responsible for broadcasting system information from a wireless access gateway to a mobile station (MT) in a cell. Such broadcast information includes information on access stratum and non-access stratum, and 3GPP broadcasts each block type period in the form of a system information block (SIB). .

In this 3GPP structure, IP signaling data, which is non-connection layer information received from the general wireless conversion layer, may be broadcast in a cell by BCFE through the GC service connection point of 3GPP. One IP (v4 or v6) router broadcast of the IP signaling is contained in the system information transport block as it is. In & 3GPP, the specification states that the system information transport block SIB1 is used to broadcast data of a non-access layer (Non Access Stratum, upper layer except access layer) centering on a cell. SIB2 can be used to broadcast higher layer data when the UE has a unique (dedicated) channel with the base station.

As shown in FIG. 4, since Router Advertisement, which is one of information of the connectionless layer, includes a list of CoAs and neighbor routers, the mobile station should receive this message during handover. However, these messages are broadcast at the fastest speed on the wire at the fastest time and cannot be delivered to the wired terminal at the same time. Therefore, by connecting to the BCFE function by connecting to the general control SAP through the broadcast information transmission function of the cellular system, it is possible to significantly reduce the IP movement detection time during handover by adjusting the broadcast period more quickly. In a typical handover, the mobile terminal knows the cell movement first through the wireless measurement function.However, in order to detect mobility, IP must receive a message such as a router broadcast through the wireless channel, and the time is very long (in seconds). ), It is different from the detection time by the wireless protocol of the mobile terminal and at the same time, it must be strongly coupled with the mobility of IP.

4 is an example of 3GPP, the router broadcast (Router Advertisement) may be included in the SIB1 or SIB2 can be broadcast. In this case, the information may be ASN.1 encoded or transmitted in a transparent manner. The transmission of system information by BCFE is the total number of segments (SEG_COUNT) that can be transmitted in the system frame of the system information (SEG_COUNT), the repetition period of the system information transmission (SIB_REP), the first of the system information transmission, as in the scheduling example. Is scheduled by the factor of the first position (SIB_POS) and the offset (SIB_OFF) at the time of segmentation of the system information.

As an example of scheduling, referring to SIB1, SIB1 is two segments starting from the 0th frame of the SFN. The period is SF 8 units and the offset between segments is 3. Therefore, SIB1-1 is located at SFN 0th and SFN 3 and is repeatedly transmitted every SF 8 frames.

Through such scheduling, the IP signaling information broadcasted in the second in the IP wired situation is lowered to the radio frame unit, thereby minimizing the IP detection time according to the movement. For IP signaling traffic packets, such as for information such as a list of appropriate neighbor cells, 3GPP is included in system information block 18 and a list of radio access gateways defined by cell_id and ip address instead of PLMN (Public Land Mobile Network) identity. Configure and get off. And more radio-specific information shares a broadcast channel with IP (v4 or v6) signaling information.

(IV) IP (v4 or v6) flow classification technology

In FIG. 5, the general wireless translation layer should relay IP traffic to the corresponding data radio bearer based on the IP DiffServ Code Point in the IP (v4 or v6) header. For that purpose, a table with mappings between Layer 2 and Layer 3, QoS Service Classes should be maintained. It must intercept a portion of an IP signaling message (QoS, Mobile IP Binding Update, etc.) marked with a dedicated code point, and the intercepted ones must be forwarded to the signaling radio bearer, not the data radio bearer.

If there is a request from the incoming session (base station-> terminal) in Fig. 6, the request is made to the QoS provisioning entity in the network for the resource as much as possible. If the request is accepted from the QoS Provisioning entity, the general wireless translation layer-wireless access gateway in the base station begins the establishment of one new radio bearer (RB) after mapping the DiffServ code point to the radio class of service. If the resource is not available, it refuses to establish a radio bearer (RB) on the radio link or network.

When outgoing traffic is initiated (terminal-> base station), a general radio switching layer-mobile terminal (MT) in the mobile terminal is required to send a signaling radio bearer to request the establishment of a new data path with a given QoS profile. request to the general wireless conversion layer-wireless access gateway in the base station through a bearer. Thereafter, the general wireless conversion layer-mobile terminal MT in the mobile terminal sorts the IP packets between the data and signal paths. When the radio bearer (RB) is no longer needed, the general radio conversion layer-radio access gateway in the base station may request the release of the corresponding radio resource.

(Ⅴ) Handover Technology

It is assumed that the handover is initiated by the mobile terminal MT. This will be described with reference to FIGS. 7A and 7B.

A MT in a mobile station refers to a list of neighboring cells for handover with reference to broadcast information having quality measurements reported by the radio control protocol or made in the physical layer (PHY). . These measurements help the local mobility entity to accept IP (v4 or v6) handover decisions. When this determination is made by the local mobility responsible entity, the Mobile IP (v4 or v6) mechanism is activated. Activation of this mechanism leads to attachment of the new cell indicated by the mobility management entity with the detachment of the connection layer (AS).

(Ⅴ-1) DCFE: Handover and QoS Configuration

All primitives are transported via DC-SAP.

(Ⅴ-2) IP (v4 or v6) registration and handover support

The purpose is to attach and release an IP (v4 or v6) subset to the mobile station. In a larger sense, the mobile terminal MT may be in an idle mode or a connected mode. Assuming that the mobile terminal is first powered on, after powering on, the mobile terminal enters a dormant state. After receiving and synchronizing a synchronization channel in the idle state, system information is received through a broadcast channel (BCH). The state of the mobile terminal is a state in which the mobile terminal is physically attached to the wireless access gateway. The mobile terminal monitors the messages broadcast by the base station's radio access gateway. If applicable, the radio control protocol in the mobile terminal forwards the information received to the general wireless conversion layer. The mobile terminal is in a connected mode based on a general wireless conversion layer-mobile terminal in the mobile terminal during handover or during registration with the network.

In case of a handover of a general wireless conversion layer-mobile terminal (MT) in a mobile terminal, a state transition from idle mode to connected mode is sent by sending a CONN_ESTABLISH_REQ primitive including the selected wireless access gateway cell id. Will begin. The mobile station MT sends a radio control protocol message to the radio access gateway of the base station. In this radio control protocol message (eg, RRC Connection Request in 3GPP), a unique mobile terminal identifier (eg, IMSI, IMEI, TMSI, P-TIMS, etc.) of the mobile station MT is delivered.

A signaling radio bearer (SRB) is connected by a procedure message for establishing an SRB of a radio control protocol, and through this SRB, CONN_ESTABLISH_REQ at the base station is forwarded to a CONN_ESTABLISH_IND primitive to the general wireless conversion layer of the base station. If a CONN_ESTABLISH_RSP for CONN_ESTABLISH_IND is received at the base station's radio control protocol layer from the base station general wireless transformation layer and the meaning of this CONN_ESTABLISH_RSP response is an acknowledgment, the radio control protocol contacts the associated radio resource management (RRM). These entities (RRMs) provide a common radio resource method found in the Radio Network Controller (RNC) of a cellular mobile communication system network.

This method calculates a new radio configuration for the cell. The configuration information for the traffic radio bearer is transmitted to the mobile station MT through a signaling radio bearer (SRB) that has already been set, and the mobile station transmits corresponding resources of the terminal to the lower layer (PHY /) of the mobile station. MAC / RLC / PDCP). When everything is successfully set up at the base station and the mobile terminal, the general wireless transformation layer-mobile terminal (MT) in the mobile terminal finally receives a CONN_ESTABLISH_CNF primitive in response to CONN_ESTABLISH_REQ from the radio control protocol layer of the mobile terminal.

Through this procedure, the mobile station MT can be attached to an IP (v4 or v6) subset and start signaling IP (v4 or v6).

When the existing connection is released by the handover or the mobile station MT is powered off, the decision is taken into account in the mobile station MT and the radio control protocol in the general wireless conversion layer has a CONN_RELEASE_REQ message at the mobile station. The radio control protocol layer of the base station receives this and informs the general radio conversion layer of CONN_RELEASE_IND. In this case, since there is no conventional procedure for directly disconnecting the terminal from the terminal, the addition of a release message sent from the terminal to the base station is required for the radio control protocol.

Compared to 3GPP, the procedure by the PMM / SM protocol that was supported in the packet domain is omitted, and the connection to the packet domain only by the procedure of the CONN_ESTABLISH_XXX primitive and the existing radio control protocol (for example, RRC in 3GPP) (initial connection and Handover) is possible. However, the release of the existing connection due to the handover and power-off of the mobile station is not initiated by the base station, but the necessity of adding a control message for the terminal to transmit it to the CONN_RELEAS_XXX primitive and the new radio control protocol. There is a difference. Reducing the number of messages exchanged improves overall handover performance. This simplified procedure in the new integrated structure reduces the total number of messages performed between existing entities when considering the procedure for accessing and releasing new cells through initial access and handover. This may eventually improve overall handover performance.

(Ⅴ-3) Delivery technology of IP (v4 or v6) signaling

While connected to the network in (V-2) above (while the radio bearer for traffic is being opened), signal radio bearers (SRBs) are established by the existing radio control protocol control procedure. Three radio bearers for signaling are reserved for signaling in the general wireless transformation layer and higher layers.

Packets are carried between two entities, the radio control protocol in the base station and the mobile station and the general wireless transformation layer using the DATA_TRANSFER_REQ and DATA_TRANSFER_IND primitives.

(Ⅴ-4) Flexible QoS Setting Technology

Before transmitting and receiving data, the radio bearer (RB) should be established by mutual cooperation of the general wireless conversion layer and the radio control protocol. The number of radio bearers (RBs) can be set to one mobile terminal at the same time. In the mobile terminal MT, this means two stages. For example, in 3GPP, there are two stages: PDP context activation of SM and radio bearer setup by radio control protocol. This can be done efficiently in one step. Radio bearer setup directly maps a radio access bearer (RAB) to a radio bearer (RB). The network side performs admission control and checks whether it is available to set up a service (congestion, QoS) in consideration of the resource. If the resource is available, the generic radio translation layer-radio access gateway in the base station initiates the setup procedure with the RB_ESTABLISH_REQ primitive (including the required QoS radio traffic class mapped from the IP (v4 or v6) DSCP code). The radio control protocol consults the RRM entity. The RRM entity selects the optimal set of radio layer 2 and radio layer 1 (using unbalanced resources (asymmetric uplink and downlink as much as possible).

This function means coordination of radio resource allocation between multiple radio bearers associated with the same radio control protocol connection. In this determined configuration, the mobile station MT is forwarded through the signaling radio bearer to the mobile station MT according to the existing radio control protocol radio bearer configuration control procedure. When the radio bearer for data transmission has been successfully set up, the general radio conversion layer-mobile terminal (MT) in the mobile terminal is set to RB_ESTABLISH_IND (preparing QoS information and DSCP code) to indicate that the radio bearer is set up for data. Inform. The completion message for setting up the configuration information in the mobile terminal is returned back to the base station radio access gateway through the signaling radio bearer, and forwarded to the general radio conversion layer with the RB_ESTABLISH_CNF primitive. Thus, a radio bearer for data transfer between the base station and the mobile terminal can be set up and IP (v4 or v6) data transfer can be started. These traffic radio bearers are released in the same way.

(Ⅴ-5) MCFE: Radio Layer 2 Trigger Technology to Provide Fast IP Mobility

The MCFE entity in the radio access protocol at the radio access gateway sends a control message to a peer in the mobile terminal MT, i.e., the MCFE in the radio access control protocol of the mobile terminal. It is a collection of some reports and all measurements used by the base station radio gateway by RRM. Measurements such as mobile station transmit power, RSSI (received signal strength power) or transport channel block error rate (BLER) are reported periodically to the network (base station). These entities are also responsible for reporting these measurements to the connectionless layer (NAS) in the mobile station MT. This information may constitute a radio layer 2 trigger that helps the IP and Mobile IP control entities to determine layer 3 handovers.

The measurements are reported with the MEASUREMENT_IND primitive and cover each monitored cell.

The procedure of the (V) handover technique is summarized as follows.

That is, the procedure when the mobile terminal moves to another cell,

(1) Acquire synchronization by the mobile terminal synchronization channel.

(2) Receive system information through BCH of mobile terminal.

(3) The mobile terminal forwards the CONN_ESTABLISH_REQ primitive (cell id of the wireless access gateway and cell id and the neighboring wireless access gateway cell) from the general wireless conversion layer to the radio control protocol layer.

(4) The random access message (including terminal unique identifier) of the radio control protocol is transmitted to the base station.

(5) Perform radio bearer setup procedure for signal of radio control protocol.

(6) The base station radio control protocol layer receiving the CONN_ESTABLISH_REQ through the set SRB interprets the meaning and requests the traffic radio bearer to CONN_ESTABLISH_IND.

(7) The base station general wireless conversion layer responds to the radio control protocol with CONN_ESTABLISH_RSP.

(8) If CONN_ESTABLISH_RSP means approval, the base station radio control protocol performs a procedure for establishing a radio bearer for traffic.

(8-1) The RRM, which is an existing method of the cellular system, is inquired to receive a radio bearer set value.

(9) When a radio bearer for traffic is established by the radio control protocol between the base station and the mobile terminal, the mobile terminal radio control protocol layer uploads CONN_ESTABLISH_CNF to the mobile terminal general wireless conversion layer.

(10) A path for performing IP signaling between the mobile station and the base station is secured and freely delivers the IP signaling (DATA_TRANSFER_REQ / IND).

(11) The radio bearer for traffic transmission is open, and the IP signal is transmitted and received from the base station to the terminal to the base station through the radio bearer, but the QoS is determined as the radio bearer is predefined.

(12) If the service is actually performed by IP signaling, one more radio bearer for the traffic may be set up, but in this case, the radio bearer for the existing traffic may be used together with the IP signaling and the actual service traffic. RB_ESTABLISH_REQ / IND is exchanged between the general wireless conversion layer and the radio control protocol layer. At this time, the radio control protocol layer between the base station and the terminal for resetting the RB complies with the control procedure of the existing radio control protocol.

(13) The QoS of the radio bearer is readjusted so that service traffic can also be transmitted and received between the base station and the mobile terminal, and IP signal traffic and service traffic are simultaneously transmitted and received by the radio bearer.

(14) The determination of handover (movement to another cell) in the mobile terminal is possible by receiving information collected by the base station radio access protocol. This information is transmitted to MCFE, which is the radio access control protocol of the mobile station, through the MCFE in the radio access control protocol of the base station, and the mobile station receiving this information can raise the MESEAREMENT_IND to the radio access conversion layer to enable L2 trigger on IP. Help

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It is obvious to one with ordinary knowledge.

The integrated structure proposed in the above-described present invention reduces the number of complex bearer services of the existing cellular mobile communication system, and directly uses the lowest layer service (radio bearer service) on the bearer service, thereby signaling on IP. This allows for the preparation of the contracted QoS proceeded by. Therefore, there is no need to modify an interface with a radio access technology for radio bearer service provided by the radio control protocol. In other words, by mapping the sessions and flows on the IP by placing a general wireless translation layer at the boundary of the connectionless layer at the top of the radio access layer, leaving the radio control mechanism of the radio bearer service defined by the access layer for the service, It is effective in providing an easy interface to various service requests coming in through the response node and server of the mobile communication system terminal and various service requests going out to the IP world.

In addition, the broadcast technique through the transmission of system information of the IP signal proposed in the present invention further densifies the broadcast period of the IP by scheduling the radio control protocol, thereby providing information for determining handover to the mobile terminal during handover. do.

Claims (20)

In a cellular mobile communication system, Entity (PDSN in 3GPP2, GPRS (SGSN / GGSN) in 3GPP) for connecting to base station and IP World (existing packet domain) to control IP routing capability and IP (v4 or v6) subnet that the entities have jurisdiction over A wireless access gateway; And Mobile terminal connected to the core network through the wireless gateway Including, The wireless access gateway is based on the IP (v4 or v6) core network, IP-based integrated architecture in a cellular mobile communication system, characterized in that the constituent nodes in the cellular architecture operate over IP. The method of claim 1, The wireless access gateway is an IP-based integrated structure in a cellular mobile communication system, characterized in that the base station serves as a subnet of the BTS / RTS and BSC / RNC. In the IP signaling integration method in a cellular mobile communication system, a) invoking other protocols (NBAP, RANAP, RNSAP, etc.) except for the radio control protocol (RRC in 3GPP); And b) connecting the radio control protocol and the IP by the general radio conversion layer at the radio access gateway, leaving only the radio control protocol. Including but not limited to: In the strong coupling structure and protocol stack of the radio control protocol and IP, cellular mobility, characterized in that the mobility, QoS and paging function provided by IPv6 in the case of IPv6 can be directly mapped to the radio control protocol through a general wireless conversion layer. IP signaling integration method in communication system. The method of claim 3, The general wireless conversion layer supports an interface of a specific mechanism of a cellular mobile communication system for an access network (AN) and an IP (v4 or v6) mechanism for user traffic and signaling, and a standard IP (v4 or v6) network device driver. IP signaling integration method in a cellular mobile communication system, characterized in that the form for extending the. The method of claim 3, When the IP packet arrives at the general wireless conversion layer, the packets pass through a classfire that distinguishes the signaling packet marked for the control plane and the data packet marked for the user plane, and the signaling packet passes the packet through some processing. It is mapped to a specific service access point (SAP) according to the characteristics of the down or directly mapped to SAP pass through the signaling path, the data packet passing through the user plane is characterized in that the forwarded to the corresponding radio bearer IP signaling integration method in a cellular mobile communication system. The method of claim 5, wherein the service connection point (SAP) General Control Service Connection Point (GC) providing system information broadcast service; A notification service connection point (Nt: Notification SAP) that provides paging and notification broadcast services; And Dedicated Control SAP (DC) which provides services for setting / release of one connection IP signaling integration method in a cellular mobile communication system comprising a. The method of claim 6, The general control service connection point is used to enable IP network entities providing information, to provide commands to mobile terminals not associated with a specific user, and to broadcast information to all terminals in a cell area. IP signaling integration method in cellular mobile communication system. The method of claim 6, The known service connection point broadcasts information in a cell area, but does not address a specific terminal IP signaling integration method in a cellular mobile communication system. The method of claim 6, And one connection at the slave control service connection point is one relationship having a temporary context when viewed from a wireless access gateway. The method of claim 3, The radio control protocol layer handles layer 3 control plane signaling between a mobile terminal (MT) and a radio access gateway, and the radio control protocol message is used to set up, modify, and release layer 2 and layer 1 protocol entities. A method of integrating IP signaling in a cellular mobile communication system carrying all parameters, wherein a radio control protocol message carries a payload to upper layer signaling. The method of claim 10, The radio protocol protocol entity selects one of three signaling radio bearers (sRBs: RLC-Tr, RLC-UM, RLC-AM) for its own message, and additional signaling radio bearers (sRBs) are selected from higher layers. layer: NAS) A method for integrating IP signaling in a cellular mobile communication system, which is reserved for a radio control protocol message for carrying a message. The method of claim 3, The wireless control protocol subnet includes a general wireless conversion layer interface through GC, Nt, DC SAP, Broadcast Control Functional Entity (BCFE), Paging and Notification Functional Entity (PNFE), Dedicated Control Functional Entity (DCFE), Measurement Control (MCFE) Functional Entity) and Configuration Control for PHY, MAC, RLC, PDCP protocol entities. The method of claim 12, The BCFE handles the broadcast in the SIB defined in the cellular mobile communication system from the wireless access gateway to the mobile station (MT) in the cell, broadcasts the data for the IP signal received from the general wireless conversion layer into the cell, and provides a predetermined IP. IP signaling integration method in a cellular mobile communication system, characterized in that for mapping the signal data to the corresponding type (type) of the SIB. The method of claim 12, The PNFE broadcasts broadcast paging information to a mobile station (MT) selected in the network by the radio control protocol layer, and as paging is performed at the IP level, a paging request packet is forwarded without processing on the air interface. And the PAGING_REQ primitive in the wireless access gateway and the NOTIFICATION_IND primitive in the mobile terminal deliver the actual IP paging packet through the Nt-SAP. The method of claim 12, In the wireless access gateway, the general wireless conversion layer intercepts an IP (v4 or v6) Router Advertisement message, intercepts the message during IP packet marking inspection, encodes the message into a system information transport block, and connects the general control service connection point. To the wireless control protocol, The radio control protocol broadcasts the router broadcast information in a single cell, The wireless control protocol of the terminal receives the system information, and when the system information is encoded, restores the router broadcast message through decoding to give information to the upper IP terminal, and the wired IP of the terminal receives the router broadcast information. IP signaling integration method in a cellular mobile communication system, characterized by restoring a network prefix of a cell. The method of claim 15, And the message includes a list of neighboring wireless access gateways. The method of claim 15, In the case of the IPv6, IP signaling integration method in a cellular mobile communication system characterized in that it determines its own local IP (v6) link and CoA using stateless auto-configuration (IP-specific). The method of claim 15, In the case of the IPv4, IP signaling integration method in a cellular mobile communication system, characterized in that the CoA information is broadcast to the router broadcast information. In the IP signaling integration method of a cellular mobile communication system, a) acquiring synchronization by a synchronization channel of a mobile terminal and receiving system information through a broadcast channel (BCH) of the mobile terminal; b) transmitting, at the mobile terminal, a CONN_ESTABLISH_REQ primitive from the general wireless conversion layer to the radio control protocol layer, and transmitting a random access message including a terminal unique identifier of the radio control protocol to the base station; c) performing a radio bearer setup procedure for a signal of a radio control protocol, and receiving a CONN_ESTABLISH_REQ through a set signaling radio bearer (SRB), the base station radio control protocol layer interprets the meaning and requests a traffic radio bearer with CONN_ESTABLISH_IND ; d) the general wireless translation layer of the base station responds to the radio control protocol with CONN_ESTABLISH_RSP, and the CONN_ESTABLISH_RSP means that the base station radio control protocol performs a procedure for establishing a radio bearer for traffic; e) when the radio bearer for traffic is established by the radio control protocol between the base station and the mobile terminal, the mobile terminal radio control protocol layer uploading CONN_ESTABLISH_CNF to the mobile terminal general wireless conversion layer; f) A path for IP signaling between the mobile station and the base station is secured so as to freely transmit IP signaling (DATA_TRANSFER_REQ / IND), and a radio bearer is provided for traffic transmission, and through this radio bearer, an IP signal is transmitted from the base station. Transmitting and receiving from the terminal to the base station; g) If the service is actually performed by IP signaling, one more radio bearer may be set up for the traffic, but the general radio translation layer in the base station may be used to use the radio bearer for the traffic together with the IP signaling and the actual service traffic. Transmitting and receiving RB_ESTABLISH_REQ / IND between radio control protocol layers; h) rebalancing the QoS of the radio bearer so that service traffic can also be transmitted and received between the base station and the mobile terminal, and simultaneously transmitting and receiving IP signal traffic and service traffic to the radio bearer; And i) Determination of the handover to move from the mobile station to another cell is possible by receiving information collected from the base station radio access protocol, and this information is moved through the MCFE (Measurement Control Functional Entity) in the base station radio access control protocol. It is delivered to the MCFE which is a radio access control protocol of the terminal, the mobile terminal receiving the step to enable the L2 trigger on the IP by raising the MESEAREMENT_IND to the radio access conversion layer; IP signaling integration method in a cellular mobile communication system characterized in that the handover is applied when the mobile station moves to another cell. The method of claim 19, In step b), the CONN_ESTABLISH_REQ primitive includes a cell id of a radio access gateway, a neighbor radio access gateway cell id, and an ip address.

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