KR20180042118A - Communication method and apparatus based on access network paging and core network paging - Google Patents

Abstract

Disclosed are a method and a device for communicating based on an access network paging and a core network paging. The disclosed communication method performed by an anchor radio access network (RAN) comprises the following steps of: receiving a signaling message or a data packet with respect to user equipment (UE) from a core network; triggering a paging with respect to the UE; and transmitting a paging request to the core network if the paging is failed. Also, a new RAN performs the paging with respect to the UE based on the CN support paging request message. System and terminal resource utilization can be optimized by using a paging method optimized according to a terminal characteristic and a network environment.

Description

Field of the Invention [0001] The present invention relates to a communication method and apparatus based on access network paging and core network paging,

The following description relates to a communication method and apparatus based on access network paging and core network paging, and more particularly to a method and apparatus for performing communication via core network paging when access network paging fails and the UE is not responding .

In the LTE, when the UE becomes inactive (RRC_IDLE) in the base station, it is deactivated (ECM_IDLE) in the core network and is activated (ECM_CONNECTED) in the core network when the base station becomes active in the RRC_CONNECTED state. It consists of a single structure that requests paging in the core network.

On the other hand, in the 5G, even if the terminal becomes inactive in the base station, it is determined that the terminal is activated in the core network, and the packet is transmitted to the base station without paging. In this case, when the paging of the access network unit initiated by the base station is used, the packet is directly transmitted to the access network. Therefore, if the terminal can not receive the packet but is not recognized by the core network, Can occur.

In the present invention, when an attempt is made to paging the access network unit, if failure occurs, a request is made to the core network to retry the paging of the core network unit, thereby preventing packet loss and service connection failure Can be effectively prevented.

The present invention can optimize system and terminal resource utilization by using an optimized paging scheme according to the characteristics of the terminal and the network environment.

A method of communication performed by an anchor RAN according to an embodiment includes receiving a signaling message or a data packet for a UE from a core network; Triggering paging for the UE; And sending a paging request to the core network if the paging fails, the core network sending a CN support paging request message to a new RAN in a target paging area determined based on the paging request, The RAN performs paging for the UE based on the CN support paging request message.

In a communication method according to an embodiment, NG2 and NG3 connections for the UE can be reconfigured to the new RAN and the core network when the UE has responded to the paging of the new RAN.

In a communication method according to an exemplary embodiment, when the UE has responded to the paging of the new RAN, the UE may return to the RRC_CONNECTED state in the RCC_INACTIVE state or the RCC_IDLE state.

The method may further include forwarding at least one of the signaling message, the data packet and the context information to the new RAN when the UE has responded to the paging of the new RAN.

In a communication method according to an embodiment, the paging request may include RAN paging area information for the paged triggered, and finally activated cell information.

The communication method according to an exemplary embodiment may further include the step of buffering the signaling message or the data packet when the triggered paging fails.

In the communication method according to an exemplary embodiment, the step of receiving the signaling message or the data packet may receive the signaling message from the CP function of the core network or receive the data packet from the UP function of the core network.

A method of communication performed by a core network according to an embodiment includes transmitting a signaling message or a data packet for a UE to an anchor RAN; Receiving a paging request from the anchor RAN if paging of the RAN for the UE fails; And transmitting a CN supported paging request message to a new RAN in a target paging area determined based on the paging request, wherein the new RAN performs paging for the UE based on the CN supported paging request message.

In a communication method according to an embodiment, NG2 and NG3 connections for the UE can be reconfigured to the new RAN and the core network when the UE has responded to the paging of the new RAN.

In a communication method according to an exemplary embodiment, when the UE has responded to the paging of the new RAN, the UE may return to the RRC_CONNECTED state in the RCC_INACTIVE state or the RCC_IDLE state.

In the communication method according to an exemplary embodiment, when the UE responds to the paging of the new RAN, the anchor RAN may forward at least one of the signaling message, data packet and context information to the new RAN.

In the communication method according to an exemplary embodiment, the paging request may include RAN paging area information for paging of the anchor RAN, and last activated cell information.

In a communication method according to an exemplary embodiment, when the anchor RAN fails to paging, the signaling message or data packet may be buffered in the anchor RAN.

The step of transmitting the signaling message or the data packet may include transmitting the signaling message from the CP function of the core network to the anchor RAN or transmitting the signaling message from the UP function of the core network to the anchor RAN. Packets can be transmitted.

A communication device for communicating with a UE and a core network according to an embodiment comprises: a processor; And a memory comprising at least one instruction executable by the processor, wherein if the at least one instruction is executed in the processor, the processor receives from the core network a signaling message or data packet for the UE And sending a CN support paging request message to the new RAN in the target paging area determined based on the paging request, if the paging is unsuccessful, And the new RAN performs the paging for the UE based on the CN supported paging request message.

In a communication device according to an embodiment, when the UE has responded to the paging of the new RAN, NG2 and NG3 connections for the UE can be reconfigured with the new RAN and the core network.

In a communication device according to an exemplary embodiment, the processor may forward at least one of the signaling message, data packet and context information to the new RAN when the UE has responded to the paging of the new RAN.

In a communication apparatus according to an exemplary embodiment, the paging request may include RAN paging area information for the triggered paging, and finally activated cell information.

In a communication device according to one embodiment, the processor may buffer the signaling message or data packet if the triggered paging fails.

In a communication device according to an embodiment, the processor can receive the signaling message from the CP function of the core network or the data packet from the UP function of the core network.

According to an exemplary embodiment, when an attempt is made to paging the access network unit but it fails, the mobile station requests support to the core network and retries the paging of the core network unit. Thus, packet loss and service The connection failure can be effectively prevented.

According to an exemplary embodiment, system and terminal resource utilization can be optimized by using an optimized paging scheme according to characteristics of a terminal and a network environment.

1 is a diagram illustrating a procedure in which a downlink NG1 signaling message is delivered according to an embodiment.
2 is a diagram illustrating a procedure in which a downlink NG3 data packet is delivered according to an embodiment.
FIG. 3 is a diagram illustrating a procedure in which CN support paging is performed after failure of RAN specific paging according to an embodiment.
4 is a diagram illustrating a CN determination procedure for RAN-specific paging according to an embodiment.
5 is a diagram illustrating a communication apparatus according to an embodiment.

Specific structural or functional descriptions of embodiments are set forth for illustration purposes only and may be embodied with various changes and modifications. Accordingly, the embodiments are not intended to be limited to the specific forms disclosed, and the scope of the disclosure includes changes, equivalents, or alternatives included in the technical idea.

The terms first or second, etc. may be used to describe various elements, but such terms should be interpreted solely for the purpose of distinguishing one element from another. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected or connected to the other element, although other elements may be present in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", and the like, are used to specify one or more of the described features, numbers, steps, operations, elements, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The specific structural or functional descriptions below are illustrated for purposes of illustration only and are not to be construed as limiting the scope of the embodiments to those described in the text. Those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the scope of the present invention. In addition, the same reference numerals shown in the drawings denote the same members, and the well-known functions and structures are omitted.

1 is a diagram illustrating a procedure in which a downlink NG1 signaling message is delivered according to an embodiment.

When a UE is in a CN_CONNECTED state, a user plane path and a signaling path for a UE are transmitted to a NextGen CN and a NextGen RAN (Radio Access Network) according to an embodiment, Lt; / RTI > In other words, when the UE is in the CN_CONNECTED state, the NG2 connection and the NG3 connection to the UE are always present, but the UE may be in the Radio Resource Control (RRC) _INACTIVE state or the RRC_IDLE state. Therefore, before signaling message / data packet transmission, the UE should return to the RRC_CONNECTED state. However, the UP (User Plane) function and the CP (Control Plane) function of the NextGen CN do not recognize the RAN state of the actual UE.

The NextGen CN represents a 5G core network, and the NextGen RAN represents a 5G radio access network, and may be referred to as "core network" and "RAN" Also, NG2 represents a reference point for the control plane between the RAN and the core network, and NG3 represents a reference point for the user plane between the RAN and the core network. The CN_CONNECTED state indicates a state in which a signaling path between the UE and the core network is established, and the RRC_CONNECTED state indicates a state in which a signaling path between the UE and the RAN is established. In the RRC_INACTIVE state, the signaling and the user plane path between the UE and the RAN are deactivated, but in the core network, the signaling and the user plane path for the corresponding UE are maintained in the last connected RAN. The RRC_IDLE state The signaling and user plane path between the UE and the RAN is deactivated and at the same time the signaling and user plane path for the UE is deactivated in the core network.

DL (Downlink) data packet and MT (Mobile Terminated) signaling message can be directly transmitted to the RAN by the UP and CP functions of the core network. When the UE is in RRC_INACTIVE or RRC_IDLE state, RAN Specific Paging is triggered . In this case, the DL data packet and the MT signaling message can be buffered in the RAN.

If coordination between a new RAN with an NG2 and NG3 connection to the UE and an anchor RAN is supported when the UE in the RRC_INACTIVE state or RRC_IDLE state moves to the area served by the new RAN, The DL data packet or MT signaling message may cooperate with the new RAN to page the UE. However, if coordination between the new RAN and the anchor RAN is not supported, the new RAN needs to initiate the establishment of the NG2 and NG3 connections.

Referring to FIG. 1, if a downlink signaling message for a UE in the CN_CONNECTED state is generated, the core network can transmit a DL signaling message to the RAN through NG2. If the UE is in the RRC_INACTIVE or RRC_IDLE state, RAN specific paging is triggered and the DL signaling message can be buffered in the RAN until the UE returns to the RRC_CONNECTED state.

At step 110, the core network CP function may generate a downlink NG1 signaling message to transmit to the UE.

In step 120, the core network CP function may send a downlink NG1 signaling message to the RAN via NG2.

In step 130, if the UE is in the RRC_INACTIVE or RRC_IDLE state, the RAN may perform RAN specific paging after buffering the downlink NG1 signaling message. Here, the RAN specific paging can be defined by the RAN WG. Through this, the UE can return to the RRC_CONNECTED state.

In step 140, if the UE returns to the RRC_CONNECTED state, the RAN may send a buffered downlink NG1 signaling message to the UE.

At step 150, the core network CP function and the UE may exchange the downlink NG1 signaling message.

2 is a diagram illustrating a procedure in which a downlink NG3 data packet is delivered according to an embodiment.

Referring to FIG. 2, if there is a downlink data packet received in the core network UP function, the core network UP function can directly forward the downlink data packet to the RAN. If the UE is in the RRC_INACTIVE or RRC_IDLE state, the RAN may initiate a RAN Specific Paging procedure to buffer the downlink data packet and return the UE to the RRC_CONNECTED state. When the UE returns to the RRC_CONNECTED state, the RAN can forward the buffered download data packet to the UE.

At step 210, a downlink data packet may be received at the core network UP function.

In step 220, the core network UP function may forward the downlink data packet to the RAN through existing NG3 tunnels. The downlink data packet may be buffered in the RAN. The RAN can check the UE RAN status. If the UE is in RRC_CONNECTED state, step 250 may be performed. If the UE is not in the RRC_CONNECTED state, step 230 may be performed.

In step 230, the RAN may perform RAN-specific paging and change the UE to the RRC_CONNECTED state.

In step 240, the RAN may send a downlink data packet to the UE.

At step 250, the UE and the core network UP function may initiate transmission for data packets.

FIG. 3 is a diagram illustrating a procedure in which CN support paging is performed after failure of RAN specific paging according to an embodiment.

Referring to FIG. 3, when RAN specific paging is applied, the signaling message or data packet may be buffered in the RAN. If RAN paging can not reach the target UE due to unsuccessful paging coordination in the RAN paging area or movement of the UE without proper NG2 / NG3 reestablishment, Lt; / RTI > CN assisted paging retry procedures can be used to compensate for RAN specific paging failures. When the RAN can not reach the target UE due to RAN specific paging, the RAN can send a paging request to the core network, and the CN can start paging.

Here, the RAN paging area can be described as follows. The UE must transmit a paging message requesting to establish a connection to the UE since it is unable to transmit packets immediately because the currently active connection is absent from the RAN viewpoint. It is difficult to specify the area where the paging message should be transmitted because the accurate position of the moving UE is not recognized in real time while the connection is inactivated. To solve this problem and to limit the size of the area for transmitting the paging message , The concept of the RAN paging area can be defined. The UE may be operable to inform the RAN when the connection goes out of the RAN paging area set by the RAN even when the connection is inactive. Therefore, although the RAN does not know the precise location of the UE in which the connection is deactivated, the UE can expect to remain in the allocated RAN paging area and can transmit a paging message around the corresponding area to wake up the UE.

In step 310, the core network may generate a signaling message of NG1 or a data packet of UP and transmit it to the anchor RAN. For example, the core network CP function may send a signaling message to the anchor RAN, or the core network UP function may transmit the data packet to the anchor RAN. The signaling message or data packet may be buffered at the anchor RAN.

In step 320, the anchor RAN may trigger RAN paging including paging adjustments between some RANs. At this time, RAN paging may not reach the UE successfully, in which case step 330 may be performed.

At step 330, the RAN may request CN assistance (CN assistance) for paging to the core network. In other words, the RAN can send a paging request to the core network. The paging request may further include additional information. For example, the additional information may include RAN paging area information, a last activated cell, and the like.

In step 340, the core network CP function determines the target paging area based on a paging request from the RAN, and transmits a CN Assisted Paging Request message to the other RANs and the new RAN in the target paging area .

Here, the target paging area can be described as follows. Since the RAN does not know the precise location of the UE, it is possible to perform paging by appropriately determining an area where paging is to be attempted based on an area where the terminal is expected to exist. At this time, an area where paging is attempted may be referred to as a target paging area.

At step 350, other RANs and new RANs that have received a CN-supported RAN paging request from the core network CP function may perform paging. At this time, the target UE receiving the paging message from the new RAN responds to the paging request, whereby the UE can be changed to the RRC_CONNECTED state.

For example, other RANs and the new RAN may retrigger the RAN-specific paging based on the paging request (e.g., control information of the RAN) delivered in step 130, or may use the normal CN initiated paging used) may be reused.

At step 360, the NG2 / NG3 connection to the UE may be re-established to the new RAN and core network.

At step 370 forwarding of the signaling message and / or data packet and / or context information from the anchor RAN to the new RAN may be performed. In other words, the anchor RAN can forward at least one of the signaling message and the data packet context information to the new RAN.

Here, the context information may refer to information about a corresponding UE received / generated / stored in the RAN at the time of connection with the UE or during the service in order to provide an appropriate service to the UE.

At step 380, the UE and the core network may continue to transmit signaling messages and data packets.

4 is a diagram illustrating a CN determination procedure for RAN-specific paging according to an embodiment.

When RAN specific paging is used, signaling messages and data packets are buffered directly to a specific RAN, and coordination between RANs is required to support paging for multiple RANs. Such RAN specific paging may be inefficient depending on network environment and UE characteristics. For example, in a network environment where the coordination between RANs is limited, due to the limited size of the RAN paging area, frequent area update for RAN paging, or movement of the UE to a new RAN that does not support anchor RAN and paging coordination RAN specific paging may be inefficient due to packet loss at the previous anchor RAN caused.

The support of the core network function for RAN specific paging can mitigate the expected problem. The core network function may determine the UE and the state to which the RAN specific paging will be applied based on the network environment and UE characteristics, assuming that both CN paging and RAN specific paging can be selectively applied to the UE in a particular state.

Referring to FIG. 4, a procedure is shown in which the core network determines the paging type of the UE, i.e., CN paging or RAN paging.

Multiple paging types may be supported for a particular state, or a single paging type may be supported for each particular state. If only one paging type is supported per UE state, the procedure shown in FIG. 4 may be applied to limit the possible states of the UE.

In step 410, the policies and user subscription data associated with the RAN specific paging may be preconfigured or retrieved during the associated procedure. For example, the policy / user subscription data may be retrieved and transmitted to the core network CP function.

In step 420, the RAN may send information related to the RAN specific paging, e.g., the local preferences and / or configuration of the RAN for RAN specific paging, to the core network CP function. For example, this step 420 may be combined with a service request or area update of the UE.

In step 430, the core network CP function may determine what type of paging (e.g., RAN specific paging or CN initiation paging) should be applied to the UE based on the operator's policy and the received information.

In step 440, an appropriate configuration for supporting the determined type of paging may be performed in the UE, RAN, core network CP functionality, and core network UP functionality.

5 is a diagram illustrating a communication apparatus according to an embodiment.

Referring to FIG. 5, a communication device 500 according to an embodiment includes a memory 510 and a processor 520. The memory 510 and the processor 520 may communicate with each other via a bus 530.

The communication apparatus 500 is an apparatus for performing wired or wireless communication with another communication apparatus, and may correspond to any one of the UE, the RAN, and the core network described with reference to FIG. 1 to FIG. The communication device 500 may be implemented as part of various computing devices.

The memory 510 may include instructions readable by a computer. The processor 520 may perform the aforementioned operations as the instructions stored in the memory 510 are executed in the processor 520. [ The memory 510 may be a volatile memory or a non-volatile memory.

The processor 520 may execute instructions, programs, or control the communication device 500. The processor 520 may perform the operations described in Figures 1-4.

When the communication device 500 according to an embodiment corresponds to an anchor RAN that performs communication with the UE and the core network, the processor 520 receives a signaling message or data packet for the UE from the core network, Triggers paging, and sends a paging request to the core network if paging fails. At this time, the core network sends a CN support paging request message to the new RAN in the target paging area determined based on the paging request. In addition, the new RAN performs paging for the UE based on the CN supported paging request message.

Besides, the above-described operation can be performed with respect to the communication device 500.

The embodiments described above may be implemented in hardware components, software components, and / or a combination of hardware components and software components. For example, the devices, methods, and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, such as an array, a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

The components described in the embodiments may be implemented by a programmable logic device such as one or more DSP (Digital Signal Processor), a processor, a controller, an application specific integrated circuit (ASIC), and a field programmable gate array Logic Element, other electronic devices, and combinations thereof. ≪ RTI ID = 0.0 > At least some of the functions or processes described in the embodiments may be implemented by software, and the software may be recorded in a recording medium. The components, functions and processes described in the embodiments may be implemented by a combination of hardware and software.

Although the embodiments have been described with reference to the drawings, various technical modifications and variations may be applied to those skilled in the art. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Claims (20)

In the communication method performed by the anchor RAN,
Receiving a signaling message or data packet for the UE from the core network;
Triggering paging for the UE; And
If the paging fails, transmitting a paging request to the core network
Lt; / RTI >
The core network sends a CN support paging request message to a new RAN in a target paging area determined based on the paging request,
Wherein the new RAN performs paging for the UE based on the CN supported paging request message,
Communication method. The method according to claim 1,
And if the UE responds to the paging of the new RAN, NG2 and NG3 connections for the UE are re-established to the new RAN and the core network. The method according to claim 1,
And if the UE has responded to the paging of the new RAN, the UE returns from the RCC_INACTIVE state or the RCC_IDLE state to the RRC_CONNECTED state. The method according to claim 1,
Forwarding at least one of the signaling message, data packet and context information to the new RAN when the UE has responded to the paging of the new RAN
Further comprising: The method according to claim 1,
The paging request
And RAN paging area information for the triggered paging, and finally activated cell information. The method according to claim 1,
Buffering the signaling message or data packet if the triggered paging has failed;
Lt; / RTI > The method according to claim 1,
The step of receiving the signaling message or data packet
Receiving the signaling message from the CP function of the core network or receiving the data packet from the UP function of the core network. In a communication method performed by a core network,
Sending a signaling message or data packet for the UE to the anchor RAN;
Receiving a paging request from the anchor RAN if paging of the RAN for the UE fails; And
Sending a CN supported paging request message to a new RAN in a target paging area determined based on the paging request
Lt; / RTI >
Wherein the new RAN performs paging for the UE based on the CN supported paging request message,
Communication method. 9. The method of claim 8,
And if the UE responds to the paging of the new RAN, NG2 and NG3 connections for the UE are re-established to the new RAN and the core network. 9. The method of claim 8,
And if the UE has responded to the paging of the new RAN, the UE returns from the RCC_INACTIVE state or the RCC_IDLE state to the RRC_CONNECTED state. 9. The method of claim 8,
And if the UE responds to the paging of the new RAN, the anchor RAN forwards at least one of the signaling message, data packet and context information to the new RAN. 9. The method of claim 8,
The paging request
RAN paging area information for paging of the anchor RAN, and last activated cell information. 9. The method of claim 8,
And if the paging of the anchor RAN fails, the signaling message or data packet is buffered at the anchor RAN. 9. The method of claim 8,
The step of transmitting the signaling message or data packet
Transmitting the signaling message from the CP function of the core network to the anchor RAN or transmitting the data packet from the UP function of the core network to the anchor RAN. A communication device for performing communication with a UE and a core network,
A processor; And
A memory including at least one instruction executable by the processor,
Lt; / RTI >
Wherein if the at least one instruction is executed in the processor, the processor receives from the core network a signaling message or data packet for the UE, triggers paging for the UE, and if the paging fails, Lt; RTI ID = 0.0 > paging request,
The core network sends a CN support paging request message to a new RAN in a target paging area determined based on the paging request,
Wherein the new RAN performs paging for the UE based on the CN supported paging request message,
Communication device. 16. The method of claim 15,
And if the UE responds to the paging of the new RAN, the NG2 and NG3 connections for the UE are re-established to the new RAN and the core network. 16. The method of claim 15,
The processor
And forwarding at least one of the signaling message, data packet and context information to the new RAN when the UE has responded to the paging of the new RAN. 16. The method of claim 15,
The paging request
RAN paging area information for the triggered paging, and finally activated cell information. 16. The method of claim 15,
The processor
And buffering the signaling message or data packet if the triggered paging fails. 16. The method of claim 15,
The processor
Receive the signaling message from the CP function of the core network or receive the data packet from the UP function of the core network.

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