KR102206773B1 - Methods for controlling data volume of secondary gNB and Apparatus thereof - Google Patents

Abstract

The present disclosure relates to a method and apparatus for controlling NR data usage based on an interface between an NR base station and an LTE base station and an interface between an EPC and an LTE base station in a 5G Non-standalone (NSA) network structure using LTE EPC as a core network. In one embodiment, the secondary base station receives information on the amount of data transmitted and received from the secondary base station using the radio resources of the secondary base station from the secondary base station, and the secondary base station uses the radio resources of the secondary base station to determine the amount of data transmitted and received with the terminal. It provides a method and apparatus comprising the step of transmitting a secondary base station data usage report message including information about the (Secondary RAT data usage report message) using the S1-C interface to the Mobility Management Entity (MME).

Description

A method and apparatus for controlling data usage of a secondary base station TECHNICAL FIELD [Methods for controlling data volume of secondary gNB and Apparatus thereof]

The present disclosure relates to a method and apparatus for controlling NR data usage based on an interface between an NR base station and an LTE base station and an interface between an EPC and an LTE base station in a 5G Non-standalone (NSA) network structure using LTE EPC as a core network.

Next-generation mobile communication technologies are being studied in accordance with the demand for large-capacity data processing and high-speed data processing. For example, in a mobile communication system such as LTE (Long Term Evolution), LTE-Advanced, and 5G of the current 3GPP series, a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data beyond voice-oriented services. Is being demanded.

In order to handle this request, the terminal and the base station need a technology for transmitting and receiving data using a plurality of carriers. For example, a carrier aggregation technology in which one base station merges a plurality of carriers to communicate with a terminal, or a dual connectivity technology in which a plurality of base stations communicate with a terminal by using a plurality of carriers are being studied.

However, although next-generation wireless access technology is being developed, it is expected that a certain period of time is required to provide communication service only to base stations using the same. Accordingly, even in a situation in which an LTE base station using a conventional radio access technology and an NR base station using a next-generation radio access technology coexist, it is necessary to provide a service through the aforementioned carrier aggregation or dual connection.

In particular, in the case of configuring dual connectivity with an LTE base station as a master base station and an NR base station as a secondary base station, the core network may be an LTE technology-based EPC. In addition, from the operator's point of view, it is necessary to separately check the data transmission/reception usage using radio resources of the NR base station to which the next-generation radio access technology is applied and use it for billing.

However, since the control protocol is not directly connected between the NR base station and the EPC, a separate confirmation procedure for data usage using radio resources of the NR base station is not disclosed, and thus the above-described operator's necessity is not satisfied.

Against the above-described background, the present disclosure intends to propose a specific method for transmitting data usage using radio resources of an NR base station to a core network in a 5G NSA network structure using LTE EPC as a core network.

An embodiment devised to solve the above-described problem is a method for a master base station to transmit data volume information of a secondary base station in a dual connectivity situation, wherein the secondary base station uses radio resources of the secondary base station to communicate with the terminal. Secondary base station data usage report message including information on the amount of data transmitted and received from the secondary base station by the step of receiving information on the amount of data transmitted and received from the secondary base station, and the secondary base station using radio resources of the secondary base station message) to a Mobility Management Entity (MME) using an S1-C interface, wherein the master base station and the secondary base station use different radio access technologies.

In addition, an embodiment is a method for a secondary base station to transmit data volume information of a secondary base station in a dual connectivity situation, wherein the secondary base station uses radio resources of the secondary base station to provide information on the amount of data transmitted and received with the terminal. Counting and transmitting, by the secondary base station, information on the amount of data transmitted and received with the terminal using the radio resources of the secondary base station to the master base station using an X2 interface, wherein the secondary base station uses the radio resources of the secondary base station. The information on the amount of data transmitted and received with the UE is included in a secondary base station data usage report message transmitted by the master base station to the Mobility Management Entity (MME), and the master base station and the secondary base station are different from each other. It provides a method characterized by using a wireless access technology.

In addition, in an embodiment, in a master base station that transmits data volume information of a secondary base station in a dual connectivity situation, the secondary base station uses radio resources of the secondary base station to transmit and receive information on the amount of data transmitted and received with the terminal as secondary. The secondary base station data usage report message including information on the amount of data transmitted and received by the receiving unit and the secondary base station received from the base station using the radio resources of the secondary base station using the S1-C interface It includes a transmitter for transmitting to the Mobility Management Entity (MME), wherein the master base station and the secondary base station use different radio access technologies.

In addition, in an embodiment, in a secondary base station that transmits data volume information of a secondary base station in a dual connectivity situation, the secondary base station counts information on the amount of data transmitted and received with the terminal by using the radio resources of the secondary base station. The control unit and the secondary base station use the radio resources of the secondary base station to include a transmitter that transmits information on the amount of data transmitted and received with the terminal to the master base station using the X2 interface, wherein the secondary base station uses the radio resources of the secondary base station. Information on the amount of data transmitted and received with the UE is included in a secondary base station data usage report message transmitted by the master base station to the Mobility Management Entity (MME), and the master base station and the secondary base station have different radio access. It provides a secondary base station characterized in that the use of technology.

The present disclosure provides an effect of transmitting information on data usage transmitted and received using radio resources of the NR base station to the core network when the LTE base station and the NR base station configure dual connectivity in a terminal.

In addition, the present disclosure provides an effect that the core network can recognize by separating the data usage using the radio resource of the NR base station and the radio resource of the LTE base station.

1 is a diagram illustrating a structure of a dual connectivity network composed of base stations using different radio access technologies according to an embodiment.
2 is a diagram for explaining the operation of a master base station according to an embodiment.
3 is a diagram illustrating a delivery path of a secondary base station data usage report message according to an embodiment.
4 is a diagram for explaining a user plane architecture of a master base station and a secondary base station in a dual connectivity structure according to an embodiment.
5 is a diagram illustrating an information element of a report message according to an embodiment.
6 is a diagram for explaining information included in a secondary base station usage report list information element according to an embodiment.
7 is a diagram illustrating an operation of a secondary base station according to an embodiment.
8 is a diagram for explaining a procedure for transmitting a secondary base station usage report using a master base station and a secondary base station according to an embodiment.
9 is a diagram showing the configuration of a master base station according to an embodiment.
10 is a diagram illustrating a configuration of a secondary base station according to an embodiment.

Hereinafter, the embodiments will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present embodiment, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present embodiment, a detailed description thereof will be omitted.

In the present specification, a wireless communication system refers to a system for providing various communication services such as voice and packet data. The wireless communication system includes a user equipment (UE) and a base station (BS).

A user terminal is a generic concept that refers to a terminal in wireless communication, as well as UE (User Equipment) in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio), as well as MS (Mobile Station) and UT in GSM. It should be interpreted as a concept that includes all of (User Terminal), SS (Subscriber Station), and wireless device.

A base station or cell generally refers to a station that communicates with a user terminal, and Node-B (Node-B), evolved Node-B (eNB), gNB (gNode-B), LPN (Low Power Node) ), Sector, Site, various types of antennas, BTS (Base Transceiver System), Access Point, Points (e.g., Transmit Point, Receiving Point, Transceiver Point), Relay Node ( Relay Node), mega cell, macro cell, micro cell, pico cell, femto cell, RRH (Remote Radio Head), RU (Radio Unit), small cell, etc.

In the various cells listed above, since there is a base station controlling each cell, the base station can be interpreted in two meanings. 1) In relation to the radio area, the device itself may provide a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, and a small cell, or 2) the radio area itself may be indicated. In 1), all devices that are controlled by the same entity that provide a predetermined wireless area are controlled by the same entity, or all devices that interact to form a wireless area in collaboration are instructed to the base station. Points, transmission/reception points, transmission points, reception points, etc. are an embodiment of the base station according to the configuration method of the wireless area. In 2), it is possible to instruct the base station to the radio region itself that receives or transmits a signal from the viewpoint of the user terminal or the viewpoint of a neighboring base station.

In the present specification, a cell refers to a component carrier having coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point, and the transmission/reception point itself. I can.

In the present specification, the user terminal and the base station are two (Uplink or Downlink) transmission/reception subjects used to implement the technology or technical idea described in this embodiment, and are used in a comprehensive sense, and are limited by a term or word specifically referred to. It doesn't work.

Here, the uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data to the base station by the user terminal, and the downlink (Downlink, DL, or downlink) is transmitting and receiving data to the user terminal by the base station. It means the way to do it.

For uplink transmission and downlink transmission, a Time Division Duplex (TDD) scheme transmitted using different times may be used, and a frequency division duplex (FDD) scheme transmitted using different frequencies, a TDD scheme and an FDD scheme Mixed use methods can be used.

In addition, in a wireless communication system, a standard is configured by configuring uplink and downlink based on one carrier or carrier pair.

In the uplink and downlink, control information is transmitted through a control channel such as Physical Downlink Control CHannel (PDCCH), Physical Uplink Control CHannel (PUCCH), and the like, and physical downlink shared channel (PDSCH), physical uplink shared channel (PUSCH), etc. It is configured with the same data channel to transmit data.

Downlink may refer to a communication or communication path from multiple transmission/reception points to a terminal, and uplink may refer to a communication or communication path from a terminal to multiple transmission/reception points. In this case, in the downlink, the transmitter may be a part of the multiple transmission/reception points, and the receiver may be a part of the terminal. In addition, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of the multiple transmission/reception points.

Hereinafter, a situation in which signals are transmitted/received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH may be expressed in the form of “transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH”.

Meanwhile, high layer signaling described below includes RRC signaling that transmits RRC information including RRC parameters.

The base station performs downlink transmission to the terminals. The base station is a physical downlink for transmitting downlink control information such as scheduling required for reception of a downlink data channel, which is a main physical channel for unicast transmission, and scheduling approval information for transmission in an uplink data channel. Can transmit a control channel. Hereinafter, transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

There are no restrictions on the multiple access scheme applied in the wireless communication system. Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA), OFDM-TDMA, OFDM-FDMA, Various multiple access techniques such as OFDM-CDMA can be used. Here, NOMA includes Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

An embodiment of this embodiment is used for resource allocation in asynchronous wireless communication evolving to LTE/LTE-Advanced, IMT-2020 through GSM, WCDMA, HSPA, and synchronous wireless communication field evolving to CDMA, CDMA-2000 and UMB. Can be applied.

In this specification, a machine type communication (MTC) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, in this specification, the MTC terminal may mean a terminal defined as a specific category for supporting low cost (or low complexity) and/or coverage enhancement.

In other words, in this specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category/type that performs an LTE-based MTC-related operation. Or, in this specification, the MTC terminal supports improved coverage compared to the existing LTE coverage, or the UE category/type defined in the existing 3GPP Release-12 or lower supporting low power consumption, or a newly defined Release-13 low cost (or low complexity) may mean UE category/type. Or, it may mean a further enhanced MTC terminal defined in Release-14.

In the present specification, a NB-IoT (NarrowBand Internet of Things) terminal means a terminal that supports wireless access for cellular IoT. The objectives of the NB-IoT technology include improved indoor coverage, support for large-scale low-speed terminals, low latency sensitivity, ultra-low cost terminals, low power consumption, and an optimized network structure.

As representative usage scenarios in New Radio (NR), which is currently being discussed in 3GPP, eMBB (enhanced mobile broadband), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communication) have been proposed.

5G technology refers to all network technologies that meet the 5G requirements of the ITU, and is described as including NR newly developed by 3GPP and eLTE improved in accordance with the conventional LTE technology according to 5G requirements.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio) Can be interpreted as a meaning used in the past or present, or in various meanings used in the future.

Meanwhile, the terms NR or 5G hereinafter will be described as encompassing new next-generation network technologies that satisfy the 5G requirements described above. In addition, a radio access technology that is distinguished from NR is described as a conventional LTE technology.

The 5G network is divided into a 5G core network (hereinafter referred to as 5GC, 5G CN, NGC, etc.) and a 5G radio access network (hereinafter referred to as NG-RAN, 5G-RAN, etc.). The NG-RAN may consist of a set of 5G NBs (gNB), which are one or more 5G base station nodes. In addition, an entity constituting the above-described core network may be referred to as a core network entity.

Meanwhile, a base station to which 5G radio access technology is applied is described as a 5G base station, a base station or an NR base station, NG-RAN, gNB, etc., but is not limited to such terms. In addition, a base station to which the conventional LTE radio access technology is applied is described and described as a 4G base station, another base station or an LTE base station, an eNB, etc., but is not limited to these terms.

Next-generation wireless access technology to satisfy 5G requirements is being studied with the aim of high-frequency band, large-capacity data processing, and high-speed data transmission/reception processing technology. However, currently, most communication services are provided using the existing 4G (LTE) wireless access technology. In order to provide a communication service, a terminal is required that secures coverage by configuring a plurality of base stations and supports a wireless access technology suitable for communication services.

However, in order for a base station using a next-generation wireless access technology to provide all communication services, it takes time for base station configuration and coverage expansion. In addition, in order to apply the next-generation radio access technology, the core network entities accessing the NR base station must also be changed.

Accordingly, a communication service is provided centering on a conventional LTE base station and a core network, but in a place where an NR base station is expanded, it is necessary to provide a higher quality communication service by utilizing an NR base station.

In this way, a network that communicates with a terminal in cooperation with an EPC or LTE base station is described and described as NSA (Non-StandAlone), rather than an NR base station performing communication with the terminal alone, and NR linked to the NR core network A network in which a base station communicates with a terminal alone is described as SA (StandAlone). In addition, in this specification, a base station that has a control plane connected to the core network and serves as an anchor is described as a master base station, and a base station that provides additional radio resources and provides only user plane data is described as a secondary base station.

The existing LTE wireless network supports interworking using the X2 interface for mobility management and dual connectivity between LTE base stations having the same structure/function.

As the 5G NSA network is newly introduced, the NR base station is essential to interwork with the existing LTE base station. Particularly, when a master LTE base station serves as an anchor, it is necessary to transmit a message of a subordinate secondary NR base station through the master base station. In addition, interworking between NR base stations and LTE base stations with different radio access technologies needs to be designed in consideration of differences in functions, bearer types and capabilities of NR and LTE base stations.

The conventional LTE wireless network can support LTE data usage information from an LTE base station linked to an Evolved Packet Core (EPC), which is a core network system, through an S1 interface and an application protocol.

However, with the introduction of a new 5G NSA network, the NR base station, which serves as a secondary base station in a dual connectivity situation, cannot connect the control plane to the EPC. In addition, as both 4G data through LTE technology and 5G data through NR technology are used, the core network needs information on not only LTE data usage but also NR data usage. The core network performs control such as calculation and reporting of LTE data and NR data, and accordingly, can perform an accurate 5G data charging operation. In particular, since the secondary base station to which the NR technology is applied does not have an S1-C interface connection with the MME unlike the master base station to which the LTE technology is applied, the NR base station cannot directly report the NR data volume to the MME.

Therefore, in order to report the NR data usage to MME in the 5G NSA network structure, a separate procedure and method must be developed.

In this specification, a procedure and apparatus for controlling NR data usage based on an interface between an NR base station and an LTE base station and an interface between an EPC and an LTE base station in a 5G Non-standalone (NSA) network structure using LTE EPC as a core network will be described. In addition, the data usage in the present specification refers to the amount of data transmitted and received by the terminal and the base station using radio resources of the corresponding base station, and may be used as terms such as data volume and data counting result. There is no limit to the term for data usage, and may mean a value obtained by counting transmission/reception data between a base station and a terminal at a specific time.

1 is a diagram illustrating a structure of a dual connectivity network composed of base stations using different radio access technologies according to an embodiment.

1, a 5G NSA network includes an LTE EPC core network (CN), an LTE radio access network serving as a master base station (LTE RAN, 110), and an NR radio access network serving as a secondary base station. It consists of an Access Network (NR RAN, 120), and the EPC is connected to an external data network (DN) through a PDN Gateway (PGW). The EPC may be composed of an MME 130 and a Serving Gateway (SGW) 140.

Dual connectivity refers to a technology in which a terminal 100 supporting one or more RX/TX uses radio resources controlled by one or more base stations 110 and 120 at the same time, and is used in various terms such as dual connection and DC. May be referred to.

A base station serving as a connection anchor in dual connectivity and serving as a reference for handover to the terminal 100 is referred to as a master base station 110. A base station that provides additional radio resources to the terminal 110 together with the master base station 110 is referred to as a secondary base station 120. The description will focus on the 5G NSA network structure (eg, 5G NSA option 3 structure), and the master base station 110 may be referred to in various terms such as an LTE base station, a master node (MN), an eNB, an anchor base station, and the like. Similarly, the secondary base station 120 may be referred to in various terms such as an NR base station, gNB, en-gNB, and SN (Secondary Node). Each term described above is not limited if it satisfies the above definition of the base station.

The structure of configuring dual connectivity using the LTE base station 110 and the NR base station 120 is referred to as EN-DC (E-UTRAN New Radio-Dual Connectivity), and the LTE base station 110 operates as a master base station, The NR base station 120 operates as a secondary base station. The LTE base station 110 and the NR base station 120 are connected through an X2 interface, and the NR base station 120 is connected with the core SGW 140 through an S1-U interface. That is, in the NR base station 120, only the user plane is associated with the core network, and the LTE base station 110 in the control plane is associated with the core network. The LTE base station 110 is linked with the MME 130 through the S1-C interface, and is linked with the SGW 140 through the S1-U interface.

The 5G terminal (5G UE, 100) is equipped with both an NR/LTE radio transceiver and radio protocol, and is connected through an NR/LTE radio interface (NR-Uu/LTE-Uu). The terminal 100 can be connected to the LTE base station 110 and the NR base station 120 and LTE-NR dual connectivity (EN-DC).

User plane interfaces between the SGW 140 and the NR gNB 120, which are LTE core networks in charge of data processing, and between the SGW 140 and the LTE eNB 110, are interlocked with S1-U interfaces, respectively. However, the S1-C (or S1-MME) interface, which is a control plane interface in the NSA structure, is interlocked only between the MME 130 and the LTE eNB 110. However, the 5G NSA network structure described with reference to FIG. 1 is exemplary, and the present embodiment may also be applied to the NSA Option 7 network structure in which the LTE base station 110 is connected to the 5G core network.

Hereinafter, an operation in which the master base station transmits information on the amount of data of the secondary base station in the above-described EN-DC network structure will be described in detail.

2 is a diagram for explaining the operation of a master base station according to an embodiment.

Referring to FIG. 2, the master base station may perform a step of receiving, from the secondary base station, information on the amount of data transmitted and received from the secondary base station by the secondary base station using radio resources of the secondary base station (S210).

For example, information on the amount of data transmitted and received with the terminal using the radio resource of the secondary base station is the downlink data transmitted to the terminal using the NR radio resource of the secondary base station and the NR radio resource received from the terminal. It can be determined by the total amount of uplink data.

In addition, from the bearer perspective, the information on the amount of data transmitted and received by the secondary base station with the terminal by using the radio resources of the secondary base station includes information on the amount of data transmitted and received with the terminal in association with the E-RAB terminated by the secondary base station. can do. Specifically, the E-RAB is linked between the terminal and the secondary base station, and data transmitted and received through the E-RAB may be included in information on the amount of data transmitted and received with the terminal using the radio resources of the secondary base station described above.

Meanwhile, in order for the secondary base station to transmit information on the amount of data transmitted and received to and from the terminal using the radio resource of the secondary base station to the master base station, counting on the amount of data is required.

For example, information on the amount of data transmitted and received by the secondary base station to and from the terminal by using the radio resources of the secondary base station may be counted by the node hosting the PDCP. Specifically, when the secondary base station performs PDCP hosting for the terminal, the secondary base station counts the amount of data. If a split bearer is configured and the PDCP of the master base station controls the split bearer, the master base station may perform counting. That is, since counting is performed based on the PDCP SDU of the PDCP layer, the node hosting the PDCP is performed.

More specifically, the amount of downlink data to be counted is counted as bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station or bytes of PDCP SDUs transmitted to the terminal. As an example, the node hosting the PDCP counts the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station when the RLC entity associated with the PDCP is in the Acknowledged Mode (AM) to obtain information on the amount of downlink data. Calculate. As another example, the node hosting the PDCP calculates information on the amount of downlink data by counting the bytes of the PDCP SDU transmitted to the terminal through the secondary base station when the RLC entity associated with the PDCP is in Unacknowledged Mode (UM). .

The amount of uplink data is counted as bytes of PDCP SDUs received by the node hosting the PDCP using radio resources of the secondary base station.

Meanwhile, the information on the amount of data transmitted and received by the secondary base station to and from the terminal using the radio resources of the secondary base station does not include the amount of data in the forwarding packet generated when the PDCP entity is reset.

In addition, when the PDCP redundant transmission is activated, the redundantly transmitted packet is counted and included only once. This is to count the exact amount of data.

The amount of data counted in the above manner is included in the report message transmitted from the secondary base station to the master base station. The report message may include various information elements, and each information element will be separately described below with reference to the drawings.

The master base station transmits a secondary base station data usage report message including information on the amount of data transmitted and received with the terminal by the secondary base station by using the radio resources of the secondary base station using the S1-C interface. It may include transmitting to a Mobility Management Entity (S220).

For example, the secondary RAT data usage report message may include information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station for each EPS bearer. Information on the amount of data transmitted/received with the terminal using the radio resource of the secondary base station may be classified for each EPS bearer and included in the secondary base station data usage report message. Through this, the core network can obtain data amount information using NR radio resources for each EPS bearer.

Meanwhile, the secondary base station data usage report message may further include information on the amount of data transmitted and received with the terminal by using radio resources of the secondary base station in association with the bearer terminated by the master base station. That is, the information on the amount of data received from the secondary base station includes only the data amount information associated with the E-RAB terminated at the secondary base station, and the data amount information associated with the bearer terminated by the master base station is counted by the master base station. It can be included in the secondary base station data usage report message. Alternatively, information on the amount of data associated with the bearer terminated by the master base station may also be counted by the secondary base station and received to the master base station through a separate report message.

As described above, the master base station and the secondary base station use different radio access technologies. For example, a master base station may use an LTE radio access technology, and a secondary base station may use an NR radio access technology. Alternatively, the master base station communicates with the terminal using radio resources to which one preset subcarrier spacing has been applied, and the secondary base station communicates with the terminal by applying subcarrier spacing dynamically allocated from a plurality of subcarrier spacing. Can be done. In addition, the secondary base station may be configured by logically/physically dividing the function of the base station into a central unit and a distributed unit. The central unit performs the functions of the RRC and PDCP layers, and the distribution unit can perform the functions of the RLC, MAC, and PHY layers.

As described above, the master base station obtains information on the amount of data transmitted and received from the secondary base station by using the radio resources of the secondary base station. In addition, the master base station transmits a secondary base station data usage report message including information on the amount of data acquired through the S1-C interface with the MME. The MME receives the secondary base station data usage report message, and the core network can use it to check the usage of NR radio resources and use it for billing.

Hereinafter, the above-described message delivery procedure, data amount counting content, and information elements of a report message will be described in more detail with reference to the drawings.

3 is a diagram illustrating a delivery path of a secondary base station data usage report message according to an embodiment.

Referring to FIG. 3, the secondary base station 310 transmits a secondary base station data usage report including information on the amount of data transmitted and received with the terminal using the counted NR radio resource to the master base station 300 (S301). Information on the amount of data transmitted and received with the terminal using the NR radio resource is transmitted through the X2 interface between the secondary base station 310 and the master base station 300. The secondary base station 301 transmits/receives with the terminal using the NR radio resource. Parameters for counting information on the amount of data generated can be set in advance.

In addition, the secondary base station 301 may pre-set a parameter for transmitting information on the amount of data transmitted and received with the terminal to the master base station 300 using NR radio resources. According to each set parameter, the secondary base station 301 transfers information on the amount of data transmitted and received to and from the terminal to the master base station 300 using NR radio resources. Delivery may be performed periodically or may be performed when a specific event is triggered as needed.

The master base station 300 includes information on the amount of data transmitted and received with the terminal using the received NR radio resource in the secondary base station data usage report message and transmits it to the MME 320 (S302). The secondary base station data usage report message may be delivered to the MME 320 through the S1 interface. Specifically, the secondary base station data usage report message is transmitted to the MME 320 through the S1-C interface.

If necessary, the master base station 300 may further include information on the amount of data using NR radio resources in connection with the bearer terminated by the master base station 300 in the secondary base station data use report message. Alternatively, the secondary base station data usage report message may separately include information on NR radio resource usage for each EPS. The secondary base station data usage report message may be periodically transmitted to the MME 320. Alternatively, transmission of the secondary base station data usage report message may be triggered when a preset event occurs. The master base station 300 may preconfigure parameters for transmission of the secondary base station data usage report message.

The master base station 300 receives a secondary base station data usage report message including information on the amount of data using the NR radio resource in step S301, and transmits it to the MME 320. That is, the messages of steps S301 and S302 may be named with the same terms. However, in the present specification, messages of two stages are classified and described in different terms for convenience of understanding.

4 is a diagram for explaining a user plane architecture of a master base station and a secondary base station in a dual connectivity structure according to an embodiment.

Referring to FIG. 4, the master base station 300 and the secondary base station 310 interwork with the X2 interface. The master base station 300 and the secondary base station 310 may each provide one or more bearers to the terminal, and for this purpose, an MCG bearer and an SCG bearer may be configured. If necessary, the master base station 300 and the secondary base station 310 may configure a split bearer.

In addition, the master base station 300 may configure the E-UTRA PDCP and NR PDCP to interwork with the secondary base station 310. The secondary base station 310 may configure only the NR PDCP entity. The master base station 300 may configure an E-UTRA RLC entity and an E-UTRA MAC entity. The secondary base station 310 may configure an NR RLC entity and an NR MAC entity.

Meanwhile, the secondary base station 310 may measure information on the amount of data transmitted and received with the terminal by using radio resources (NR radio resources) of the secondary base station.

For example, the secondary base station calculates based on the PDCP SDU packet transmitted from the PDCP layer of the secondary base station 310 to the RLC layer for a preset measurement time. For example, a packet can be calculated in units of bits or bytes. If necessary, when counting information on the amount of data, the packet header portion may be excluded and calculated. In addition, the measurement time can be set fixedly or dynamically variable. The measurement time may be set in the billing device, the MME 320, the base station 300 or 310, or the O&M (or EMS) device.

Meanwhile, the NR data usage may be individually calculated for each terminal, and whether to calculate or report the NR data usage may be individually set for each terminal. Alternatively, the NR data usage may be calculated in an EPS bearer unit or an E-RAB unit. Alternatively, NR data usage may be calculated for each individual QCI used. However, although the MSG (Master Cell Group) bearer and the SCG (Secondary Cell Group) bearer are configured and used together in the terminal, it may be calculated by merging a plurality of QCIs.

As described above, data forwarded from the secondary base station 310 to the master base station 300 may be excluded from the usage calculation. For example, a forwarding packet generated for reconfiguration of a PDCP entity may be excluded when calculating the NR data usage.

Similarly, SCG bearer data used for CA (Carrier Aggregation) duplication transmission may be excluded from the calculation of NR data usage. In other words, data used for redundant transmission is counted only once.

Alternatively, the NR data usage may be calculated for both the SCG bearer and the split bearer type. That is, 1) the master base station terminated SCG bearer, 2) the secondary base station terminated SCG bearer, 3) the master base station terminated split bearer, and 4) the secondary base station terminated split bearer can all be counted. However, it may not be calculated or reported for a specific bearer type by setting.

After transmission from the master base station 300 to the secondary base station 310 in the split bearer, if the transmission from the secondary base station 310 to the terminal fails (eg, NR radio link failure occurs), the NR data is included in the usage calculation or It can be excluded.

For example, when the RLC entity linked to the PDCP is in the Acknowledged Mode (AM), the secondary base station 310 counts the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station 310 to determine the amount of downlink data. Information can be calculated. That is, when the RLC is in the response mode, only PDCP SDUs that have received an ACK for successful reception from the terminal may be counted as NR radio resource usage.

As another example, the secondary base station 310 can calculate information on the amount of downlink data by counting bytes of the PDCP SDU transmitted to the terminal through the secondary base station when the RLC entity linked to the PDCP is in Unacknowledged Mode (UM). have. That is, when the RLC entity is a UM, feedback on whether or not the terminal has successfully received PDCP SDUs cannot be checked, and thus all PDCP SDUs transmitted from the base station can be counted.

As another example, the amount of uplink data is counted as bytes of PDCP SDUs received by the node hosting the PDCP using radio resources of the secondary base station 310. In addition to this, data of a split bearer used for dual connectivity (DC) redundant transmission may be included in the usage.

For the master base station terminated SCG bearer and the master base station terminated split bearer, NR data usage may be reported by the master base station 300. For the secondary base station terminated SCG bearer and the secondary base station terminated split bearer, NR data usage may be reported from the secondary base station 310 to the master base station 300.

As described above, NR data usage may be transmitted according to a predetermined period. On/off of the periodic report function can be supported by MME (including O&M devices) or base stations (including O&M devices). In addition, a plurality of reporting period timers for this may be preset. For example, the base station may select a single or a plurality of timers to be used from among a plurality of available reporting period timer sets. The selection of the corresponding timer may be applied differently to individual EPS bearers, or may be applied equally to all EPS bearers. If necessary, the report period timer may be changed automatically or manually by setting the report cycle timer so as to reduce the network signaling load due to frequent reporting of NR data usage.

5 is a diagram illustrating an information element of a report message according to an embodiment. 6 is a diagram for explaining information included in a secondary base station usage report list information element according to an embodiment.

Referring to FIG. 5, information on the amount of data transmitted/received to and from the terminal by using the radio resource of the secondary base station transmitted from the secondary base station to the master base station may be included in the report message. The report message may be a "secondary base station data use report message", but it is described as a report message to distinguish it from the secondary base station data use report message transmitted by the master base station to the MME. However, the report message and the secondary base station data usage report message may include the same information.

The report message may include a message type information element, a MeNB UE X2AP ID information element, an SgNB UE X2AP ID information element, and a secondary base station usage report list information element. Optionally, the report message may further include a MeNB UE X2AP ID information element. For example, the message type information element indicates type information of a message transmitted from the secondary base station to the master base station. The MeNB UE X2AP ID information element means terminal identification information used to distinguish the terminal in the X2 interface control plane, and indicates information for identification of the terminal in the master base station. The SgNB UE X2AP ID information element indicates information for identifying the UE on the X2 interface control plane in the secondary base station. The secondary base station usage report list information element includes information on the amount of data transmitted/received to and from the terminal using the radio resources of the secondary base station described above.

6, the secondary base station usage report list information elements include E-RAB identification information, secondary base station type information, E-RAB usage report list information, and usage uplink counting (Usage count UL). ) Information and usage downlink counting (Usage count DL) information.

In the secondary base station usage report list information element, each field is configured in the secondary base station usage report item. The secondary base station usage report item is assigned a value ranging from 1 to the maximum number of bearers. That is, the number may be indicated according to the number of E-RABs terminated in the secondary base station. Accordingly, as described above, in the case of the amount of data using radio resources of the secondary base station, it may be indicated for each E-RAB.

The E-RAB identification information includes identification information on the E-RAB terminated at the secondary base station. The secondary base station type information indicates whether the secondary base station is an NR base station. The E-RAB Usage Report List information includes the usage uplink counting (Usage count UL) information and the usage downlink counting (Usage count DL) information, and the amount of data used in the corresponding E-RAB. It actually contains counting information for. The used uplink counting and the used downlink towning information element may be counted and included in units of bytes. Alternatively, the used uplink counting and the used downlink towning information element may include values in octets.

Through the above-described operation, the master base station receives information on the amount of data using NR radio resources from the secondary base station, and transmits the secondary base station data usage report message to the MME.

In the following, the operation of the secondary base station for performing the above-described embodiment will be described.

7 is a diagram illustrating an operation of a secondary base station according to an embodiment.

Referring to FIG. 7, the secondary base station uses the radio resources of the secondary base station to count information on the amount of data transmitted and received with the terminal (S710).

For example, the information on the amount of data transmitted and received by the secondary base station with the terminal by using the radio resources of the secondary base station includes information on the amount of data transmitted and received with the terminal in connection with the E-RAB terminated by the secondary base station. .

In order to count the amount of data in this way, the secondary base station separates and counts downlink data and uplink data.

For example, the secondary base station may count the amount of downlink data in bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station or bytes of PDCP SDUs transmitted to the terminal. Specifically, when the RLC entity associated with the PDCP is in the Acknowledged Mode (AM), the secondary base station counts the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station to calculate the amount of downlink data. In contrast, when the RLC entity linked to the PDCP is in the Unacknowledged Mode (UM), the secondary base station counts the bytes of the PDCP SDU transmitted to the terminal through the secondary base station to calculate information on the amount of downlink data.

As another example, the secondary base station may count the amount of uplink data in bytes of the PDCP SDU received by the node hosting the PDCP using the radio resource of the secondary base station.

The secondary base station performs a step in which the secondary base station transmits information about the amount of data transmitted and received with the terminal by using the radio resources of the secondary base station to the master base station using the X2 interface (S720).

The secondary base station transmits information about the amount of data transmitted/received with the terminal to the master base station using radio resources of the secondary base station through the X2 interface periodically or according to a specific event trigger.

Information on the amount of data transmitted and received with the terminal using the radio resource of the secondary base station may be included in the report message. The report message may include a message type information element, a MeNB UE X2AP ID information element, an SgNB UE X2AP ID information element, and a secondary base station usage report list information element. In particular, the secondary base station usage report list information element,

Includes E-RAB identification information, secondary base station type information, E-RAB usage report list information, usage uplink counting (Usage count UL) information, and usage downlink counting (Usage count DL) information can do. The amount of data transmitted/received to and from the terminal using the radio resource of the secondary base station is stored in used uplink counting (Usage count UL) information and used downlink counting (Usage count DL) information.

The report message may include information on the amount of data transmitted/received with the terminal by using the radio resources of the secondary base station for each E-RAB terminated by the secondary base station. In addition, the amount of data transmitted and received with the terminal using the radio resource of the secondary base station may not include the amount of data of the forwarding packet generated when the PDCP entity is reset. In addition, when the PDCP redundant transmission is activated, the amount of data transmitted/received with the terminal using the radio resource of the secondary base station may be counted only once and include the value.

As described above, information on the amount of data transmitted and received by the secondary base station to and from the terminal by using the radio resource of the secondary base station is a secondary base station data usage report message transmitted by the master base station to a mobility management entity (MME). message), and the master base station and the secondary base station use different radio access technologies. The secondary base station data usage report message may further include information on the amount of data transmitted and received with the terminal by using the radio resource of the secondary base station in association with the bearer terminated by the master base station. In addition, the secondary base station data usage report message may include information on the amount of data transmitted and received with the terminal by using the radio resource of the secondary base station for each EPS bearer.

8 is a diagram for explaining a procedure for transmitting a secondary base station usage report using a master base station and a secondary base station according to an embodiment.

Referring to FIG. 8, the overall operation of the base stations and the core network according to the present embodiment will be described as a series of system operations.

First, the secondary base station may set a parameter for calculating the NR data usage (S810). In order to set a parameter for calculating NR data usage, the secondary base station may receive and store the related parameter from the master base station or the core network. A plurality of parameters for calculating the NR data usage may be configured and stored in the secondary base station, and parameters to be dynamically set in the secondary base station may be determined.

When a parameter for calculating the NR data usage is set, the secondary base station calculates the NR data usage for the amount of data transmitted and received with the terminal using the radio resource (NR radio resource) of the secondary base station according to the parameter (S820). As described above, the secondary base station may count the delivery success or delivery PDCP SDU in bytes according to the mode of the RLC linked to the PDCP. In addition, the secondary base station may count without including the data amount of the forwarding packet generated when the PDCP entity is reset. Alternatively, when the PDCP redundant transmission is activated, the secondary base station may count the redundantly transmitted packet only once.

The secondary base station transmits the NR data usage to the master base station when counting on the NR data usage is completed and delivery is triggered (S830). NR data usage may be included in the report message and transmitted. The report message may include information on the amount of data transmitted and received with the terminal by using the radio resources of the secondary base station for each E-RAB terminated by the secondary base station. In addition, the report message may include various information elements described in FIGS. 5 and 6.

Upon receiving the report message, the master base station may set the NR data usage report parameter (S840). The NR data usage report parameter consists of various parameters required for the master base station to transmit a secondary base station data usage report message to the core network. Step S840 may be set simultaneously with or before step S810. In addition, a plurality of NR data usage reporting parameters may be stored, and parameters to be dynamically applied may be indicated.

The master base station transmits the NR data usage report to the MME according to the set NR data usage report parameter (S850). The NR data usage report is included in the secondary base station data usage report message and delivered. The secondary base station data usage report message may include information on the amount of data transmitted and received with the terminal by using the radio resource of the secondary base station for each EPS bearer. The secondary base station data usage report message is associated with a bearer terminated by the master base station, and may further include information on the amount of data transmitted and received with the terminal by using the radio resource of the secondary base station.

The MME uses radio resources of the secondary base station included in the secondary base station data usage report message to transmit information on the amount of data transmitted and received with the terminal to the billing device (S860). The billing apparatus may perform billing based on information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station according to the operator's setting. In addition, information on the amount of data transmitted/received to and from the terminal using the radio resource of the secondary base station can be used in various ways by setting of the operator.

Steps S810 to S860 may be performed by being integrated into one or more steps as necessary, or one step may be divided into two or more steps and performed. In addition, the order of steps S810 to S860 is exemplary, and the order may be changed in various combinations.

As described above, in the LTE EPC-based 5G NSA network described in the present disclosure, accurate billing for various 5G services is possible through calculation and reporting of NR data usage, so that a smooth commercial 5G service can be provided.

Hereinafter, configurations of a master base station and a secondary base station capable of performing some or all of the embodiments described with reference to FIGS. 1 to 8 will be described again with reference to the drawings.

9 is a diagram showing the configuration of a master base station according to an embodiment.

Referring to FIG. 9, a master base station 900 that transmits data volume information of a secondary base station in a dual connectivity situation includes information on the amount of data transmitted and received by the secondary base station with a terminal by using radio resources of the secondary base station. The receiving unit 930 for receiving from the secondary base station and the secondary base station data usage report message including information on the amount of data transmitted and received with the terminal by the secondary base station using radio resources of the secondary base station S1 It may include a transmitter 920 that transmits to a Mobility Management Entity (MME) using the -C interface.

For example, information on the amount of data transmitted and received with the terminal using the radio resource of the secondary base station is the downlink data transmitted to the terminal using the NR radio resource of the secondary base station and the NR radio resource received from the terminal. It can be determined by the total amount of uplink data. In addition, from the bearer perspective, the information on the amount of data transmitted and received by the secondary base station with the terminal by using the radio resources of the secondary base station includes information on the amount of data transmitted and received with the terminal in association with the E-RAB terminated by the secondary base station. can do.

Meanwhile, information on the amount of data transmitted and received by the secondary base station to and from the terminal by using the radio resources of the secondary base station may be counted by the node hosting the PDCP. Specifically, when the secondary base station performs PDCP hosting for the terminal, the secondary base station counts the amount of data. If a split bearer is configured and the PDCP of the master base station 900 controls the split bearer, the master base station 900 may perform counting. That is, since counting is performed based on the PDCP SDU of the PDCP layer, the node hosting the PDCP is performed.

For example, the amount of downlink data to be counted is counted as bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station or bytes of PDCP SDUs transmitted to the terminal. As an example, the node hosting the PDCP counts the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station when the RLC entity associated with the PDCP is in the Acknowledged Mode (AM) to obtain information on the amount of downlink data. Calculate. As another example, the node hosting the PDCP calculates information on the amount of downlink data by counting the bytes of the PDCP SDU transmitted to the terminal through the secondary base station when the RLC entity associated with the PDCP is in Unacknowledged Mode (UM). . The amount of uplink data is counted as bytes of PDCP SDUs received by the node hosting the PDCP using radio resources of the secondary base station.

Meanwhile, the information on the amount of data transmitted and received by the secondary base station to and from the terminal using the radio resources of the secondary base station does not include the amount of data in the forwarding packet generated when the PDCP entity is reset.

In addition, when the PDCP redundant transmission is activated, the redundantly transmitted packet is counted and included only once. This is to count the exact amount of data.

The amount of data counted in the above manner is included in the report message transmitted from the secondary base station to the master base station 900. The information elements included in the report message are as described with reference to FIGS. 5 and 6.

The secondary RAT data usage report message transmitted by the transmitter 920 may include information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station for each EPS bearer. Information on the amount of data transmitted/received with the terminal using the radio resource of the secondary base station may be classified for each EPS bearer and included in the secondary base station data usage report message.

Meanwhile, the secondary base station data usage report message may further include information on the amount of data transmitted and received with the terminal by using radio resources of the secondary base station in association with the bearer terminated by the master base station 900. That is, the information on the amount of data received from the secondary base station includes only data amount information associated with the E-RAB terminated by the secondary base station, and the data amount information associated with the bearer terminated by the master base station 900 is the master. It may be counted in the base station 900 and included in the secondary base station data usage report message. Alternatively, the amount of data associated with the bearer terminated by the master base station 900 may also be counted by the secondary base station and received by the receiving unit 930 through a separate report message.

As described above, the master base station 900 and the secondary base station use different radio access technologies. For example, a master base station may use an LTE radio access technology, and a secondary base station may use an NR radio access technology.

In addition, the control unit 910 controls the overall operation of the master base station 900 to report the NR radio resource usage information to the MME in the EN-DC network structure required to perform the above-described embodiment.

In addition, the transmission unit 920 and the reception unit 930 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present disclosure with a terminal, a core network, and a secondary base station.

10 is a diagram illustrating a configuration of a secondary base station according to an embodiment.

Referring to FIG. 10, a secondary base station 1000 that transmits data volume information of a secondary base station in a dual connectivity situation includes information on the amount of data transmitted and received by the secondary base station with a terminal using radio resources of the secondary base station. The control unit 1010 counts and the secondary base station transmits information on the amount of data transmitted and received with the terminal using the radio resources of the secondary base station to the master base station using the X2 interface.

Information on the amount of data transmitted and received by the secondary base station 1000 to and from the terminal by using the radio resources of the secondary base station 1000 is a secondary base station data usage report message transmitted by the master base station to the Mobility Management Entity (MME) (Secondary RAT data usage). report message).

For example, information on the amount of data transmitted and received by the secondary base station 1000 with the terminal using the radio resources of the secondary base station 1000 is related to the E-RAB terminated by the secondary base station 1000 to transmit and receive with the terminal. It contains information about the amount of data. In order to count the amount of data in this way, the controller 1010 separates and counts downlink data and uplink data.

As an example, the control unit 1010 may count the amount of downlink data in terms of bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station 1000 or bytes of PDCP SDUs transmitted to the terminal. Specifically, the control unit 1010 counts the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station 1000 when the RLC entity linked to the PDCP is in the Acknowledged Mode (AM), and information on the amount of downlink data Yields In contrast, when the RLC entity linked to the PDCP is in the Unacknowledged Mode (UM), the control unit 1010 counts the bytes of the PDCP SDU transmitted to the terminal through the secondary base station 1000 to calculate information on the amount of downlink data. do.

As another example, the controller 1010 may count the amount of uplink data in bytes of the PDCP SDU received by the node hosting the PDCP by using the radio resources of the secondary base station 1000.

Meanwhile, the transmitter 1020 transmits information on the amount of data transmitted and received to and from the terminal to the master base station using radio resources of the secondary base station 1000 through the X2 interface periodically or according to a specific event trigger.

Information on the amount of data transmitted and received with the terminal by using the radio resource of the secondary base station 1000 may be included in the report message. The report message may include a message type information element, a MeNB UE X2AP ID information element, an SgNB UE X2AP ID information element, and a secondary base station usage report list information element. In particular, the secondary base station usage report list information element includes E-RAB identification information, secondary base station type information, E-RAB usage report list information, usage uplink counting (Usage count UL) information and usage. It may include downlink counting (Usage count DL) information. The amount of data transmitted/received to and from the terminal using the radio resource of the secondary base station 1000 is stored in the used uplink counting (Usage count UL) information and the used downlink counting (Usage count DL) information.

The report message may include information on the amount of data transmitted/received to and from the terminal using radio resources of the secondary base station 1000 for each E-RAB terminated by the secondary base station 1000. In addition, the amount of data transmitted and received with the terminal using the radio resource of the secondary base station 1000 may not include the amount of data in the forwarding packet generated when the PDCP entity is reset. In addition, the amount of data transmitted/received to and from the terminal using the radio resource of the secondary base station 1000 may be counted only once and include the value when PDCP redundant transmission is activated.

As described above, the information on the amount of data transmitted and received by the secondary base station 1000 with the terminal by using the radio resources of the secondary base station 1000 is a secondary base station data usage report message transmitted by the master base station to a mobility management entity (MME). It is included in the (Secondary RAT data usage report message), and the master base station and the secondary base station 1000 use different radio access technologies. The secondary base station data usage report message may further include information on the amount of data transmitted and received with the terminal by using the radio resource of the secondary base station in association with the bearer terminated by the master base station. In addition, the secondary RAT data usage report message may include information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station 1000 for each EPS bearer.

In addition, the controller 1010 controls the overall operation of the secondary base station 1000 to report the NR radio resource usage information to the master base station in the EN-DC network structure required to perform the above-described embodiment.

In addition, the transmission unit 1020 and the reception unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present disclosure with a terminal, a core network, and a master base station.

Terms such as "system", "processor", "controller", "component", "module", "interface", "model" and "unit" described above are generally computer-related entity hardware, a combination of hardware and software , Software or running software. For example, the above-described components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an entity, an execution thread, a program, and/or a computer. For example, components can be both a controller or processor and an application running on a controller or processor. One or more components can reside within a process and/or thread of execution, and components can reside on one machine or be deployed on more than one machine.

The standard contents or standard documents mentioned in the above-described embodiments are omitted to simplify the description of the specification and constitute a part of the specification. Therefore, it should be construed to fall within the scope of the present disclosure to add the contents of the standard contents and some of the standard documents to the present specification or to describe in the claims.

The above description is merely illustrative of the technical idea of the present disclosure, and those of ordinary skill in the technical field to which the present disclosure pertains will be able to make various modifications and variations without departing from the essential characteristics of the technical idea. Accordingly, the embodiments disclosed in the present specification are not intended to limit the technical spirit of the present disclosure, but to describe, and the scope of the present technical idea is not limited by these embodiments. The scope of protection of the present disclosure should be construed by the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of this right.

Claims (24)

In a method for a master base station to transmit data volume information of a secondary base station in a dual connectivity situation,
Receiving, from the secondary base station, information on the amount of data transmitted/received to and from the terminal using radio resources of the secondary base station; And
A secondary base station data usage report message including information on the amount of data transmitted and received with the terminal using the radio resource of the secondary base station is transferred to the Mobility Management Entity (MME) using the S1-C interface. Including the step of transmitting,
The master base station and the secondary base station are characterized in that they use different radio access technologies,
Information on the amount of data transmitted/received with the terminal using the radio resource of the secondary base station,
It is counted by the node hosting the PDCP, and does not include the amount of data in the forwarding packet that occurs when the PDCP entity of the node hosting the PDCP is reconfigured, Counted and included,
When a split bearer is configured, the node hosting the PDCP entity controlling the split bearer counts information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station,
Information on the amount of data transmitted and received from the secondary base station using the radio resource of the secondary base station is,
Includes information on the amount of data transmitted and received from the secondary base station to the terminal for the bearer hosting the PDCP in relation to the E-RAB terminated by the secondary base station, and in the report message transmitted from the secondary base station to the master base station Included,
The report message transmitted from the secondary base station to the master base station,
It includes a message type information element, a MeNB UE X2AP ID information element, an SgNB UE X2AP ID information element, and a secondary base station usage report list information element,
The MeNB UE X2AP ID information element is information for the master base station to identify the terminal in an X2 interface control plane, and the SgNB UE X2AP ID information element allows the secondary base station to identify the terminal in an X2 interface control plane. Information for
The secondary base station usage report list information element,
Each field is included in the secondary base station usage report item, and the secondary base station usage report item is assigned a value ranging from 1 to the maximum number of bearers. delete The method of claim 1,
The secondary base station data usage report message (Secondary RAT data usage report message),
And information on the amount of data transmitted/received to and from the terminal using radio resources of the secondary base station for each EPS bearer. The method of claim 1,
Information on the amount of data transmitted and received by the secondary base station with the terminal by using the radio resource of the secondary base station,
It includes both downlink data amount information and uplink data amount information,
The downlink data amount is counted as bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station or bytes of PDCP SDUs transmitted to the terminal,
The amount of uplink data is counted as bytes of PDCP SDUs received by a node hosting the PDCP using radio resources of the secondary base station. The method of claim 4,
The node hosting the PDCP,
When the RLC entity linked to the PDCP is in an Acknowledged Mode (AM), information on the amount of downlink data is calculated by counting the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station,
When the RLC entity linked to the PDCP is in Unacknowledged Mode (UM), information on the amount of downlink data is calculated by counting bytes of the PDCP SDU transmitted to the terminal through the secondary base station. delete delete The method of claim 1,
The secondary base station usage report list information element,
Includes E-RAB identification information, secondary base station type information, E-RAB usage report list information, usage uplink counting (Usage count UL) information, and usage downlink counting (Usage count DL) information Method characterized in that to. The method of claim 1,
The secondary base station data usage report message (Secondary RAT data usage report message),
The method further comprising information on the amount of data transmitted/received to and from the terminal by using radio resources of the secondary base station in relation to the bearer terminated by the master base station. In a method for a secondary base station to transmit data volume information of a secondary base station in a dual connectivity situation,
Counting, by the secondary base station, information on the amount of data transmitted and received with the terminal by using the radio resources of the secondary base station; And
Including the step of transmitting, by the secondary base station, information on the amount of data transmitted and received with the terminal using the radio resources of the secondary base station to a master base station using an X2 interface,
Information on the amount of data transmitted and received by the secondary base station to and from the terminal by using the radio resources of the secondary base station is a secondary base station data usage report message transmitted by the master base station to a mobility management entity (MME). Is included in,
The master base station and the secondary base station are characterized in that they use different radio access technologies,
Information on the amount of data transmitted/received with the terminal using the radio resource of the secondary base station,
It is counted by the node hosting the PDCP, and does not include the amount of data in the forwarding packet that occurs when the PDCP entity of the node hosting the PDCP is reconfigured, Counted and included,
When a split bearer is configured, the node hosting the PDCP entity controlling the split bearer counts information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station,
The counting step,
Counting information on the amount of data transmitted and received by the secondary base station with the terminal for the bearer hosting the PDCP in association with the E-RAB terminated by the secondary base station,
The information on the amount of data transmitted and received by the secondary base station to and from the terminal by using the radio resources of the secondary base station is included in a report message transmitted from the secondary base station to the master base station,
The report message transmitted from the secondary base station to the master base station,
It includes a message type information element, a MeNB UE X2AP ID information element, an SgNB UE X2AP ID information element, and a secondary base station usage report list information element,
The MeNB UE X2AP ID information element is information for the master base station to identify the terminal in an X2 interface control plane, and the SgNB UE X2AP ID information element allows the secondary base station to identify the terminal in an X2 interface control plane. Information for
The secondary base station usage report list information element,
Each field is included in the secondary base station usage report item, and the secondary base station usage report item is assigned a value ranging from 1 to the maximum number of bearers. delete The method of claim 10,
The counting step,
The amount of downlink data is counted as bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station or bytes of PDCP SDUs transmitted to the terminal,
The amount of uplink data is counted in bytes of a PDCP SDU received by a node hosting the PDCP using radio resources of the secondary base station. The method of claim 12,
The counting step,
When the RLC entity linked to the PDCP is in the Acknowledged Mode (AM), information on the amount of downlink data is calculated by counting the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station,
When the RLC entity linked to the PDCP is in Unacknowledged Mode (UM), information on the amount of downlink data is calculated by counting bytes of the PDCP SDU transmitted to the terminal through the secondary base station. In a master base station for transmitting data volume information of a secondary base station in a dual connectivity situation,
A receiving unit for receiving information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station from the secondary base station; And
A secondary base station data usage report message including information on the amount of data transmitted and received with the terminal using the radio resource of the secondary base station is transferred to the Mobility Management Entity (MME) using the S1-C interface. Including a transmitting unit to transmit,
The master base station and the secondary base station are characterized in that they use different radio access technologies,
Information on the amount of data transmitted/received with the terminal using the radio resource of the secondary base station,
It is counted by the node hosting the PDCP, and does not include the amount of data in the forwarding packet that occurs when the PDCP entity of the node hosting the PDCP is reconfigured, Counted and included,
When a split bearer is configured, the node hosting the PDCP entity controlling the split bearer counts information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station,
Information on the amount of data transmitted and received from the secondary base station using the radio resource of the secondary base station is,
Includes information on the amount of data transmitted and received from the secondary base station to the terminal for the bearer hosting the PDCP in relation to the E-RAB terminated by the secondary base station, and in the report message transmitted from the secondary base station to the master base station Included,
The report message transmitted from the secondary base station to the master base station,
It includes a message type information element, a MeNB UE X2AP ID information element, an SgNB UE X2AP ID information element, and a secondary base station usage report list information element,
The MeNB UE X2AP ID information element is information for the master base station to identify the terminal in an X2 interface control plane, and the SgNB UE X2AP ID information element allows the secondary base station to identify the terminal in an X2 interface control plane. Information for
The secondary base station usage report list information element,
Each field is included in the secondary base station usage report item, and the secondary base station usage report item is assigned a value ranging from 1 to the maximum number of bearers. delete The method of claim 14,
The secondary base station data usage report message (Secondary RAT data usage report message),
The master base station comprising information on the amount of data transmitted and received with the terminal by using the radio resource of the secondary base station for each EPS bearer. The method of claim 14,
Information on the amount of data transmitted and received by the secondary base station with the terminal by using the radio resource of the secondary base station,
It includes both downlink data amount information and uplink data amount information,
The downlink data amount is counted as bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station or bytes of PDCP SDUs transmitted to the terminal,
The amount of uplink data is counted as bytes of a PDCP SDU received by a node hosting the PDCP using radio resources of the secondary base station. The method of claim 17,
The node hosting the PDCP,
When the RLC entity linked to the PDCP is in an Acknowledged Mode (AM), information on the amount of downlink data is calculated by counting the bytes of the PDCP SDU successfully transmitted to the terminal through the secondary base station,
Master base station, characterized in that when the RLC entity linked to the PDCP is in Unacknowledged Mode (UM), the information on the amount of downlink data is calculated by counting bytes of the PDCP SDU transmitted to the terminal through the secondary base station. . delete delete The method of claim 14,
The secondary base station usage report list information element,
Includes E-RAB identification information, secondary base station type information, E-RAB usage report list information, usage uplink counting (Usage count UL) information, and usage downlink counting (Usage count DL) information Master base station, characterized in that. The method of claim 14,
The secondary base station data usage report message (Secondary RAT data usage report message),
And information on the amount of data transmitted/received to and from the terminal by using radio resources of the secondary base station in association with the bearer terminated by the master base station. In the secondary base station for transmitting data volume information of the secondary base station in a dual connectivity situation,
A control unit for counting information on the amount of data transmitted and received by the secondary base station using the radio resources of the secondary base station; And
The secondary base station includes a transmitter for transmitting information on the amount of data transmitted and received with the terminal by using the radio resources of the secondary base station to the master base station using an X2 interface,
Information on the amount of data transmitted and received by the secondary base station to and from the terminal by using the radio resources of the secondary base station is a secondary base station data usage report message transmitted by the master base station to a mobility management entity (MME). Is included in,
The master base station and the secondary base station are characterized in that they use different radio access technologies,
Information on the amount of data transmitted/received with the terminal using the radio resource of the secondary base station,
It is counted by the node hosting the PDCP, and does not include the amount of data in the forwarding packet that occurs when the PDCP entity of the node hosting the PDCP is reconfigured, Counted and included,
When a split bearer is configured, the node hosting the PDCP entity controlling the split bearer counts information on the amount of data transmitted and received with the terminal using radio resources of the secondary base station,
The control unit,
Counting information on the amount of data transmitted and received by the secondary base station with the terminal for the bearer hosting the PDCP in association with the E-RAB terminated by the secondary base station,
The information on the amount of data transmitted and received by the secondary base station to and from the terminal by using the radio resources of the secondary base station is included in a report message transmitted from the secondary base station to the master base station,
The report message transmitted from the secondary base station to the master base station,
It includes a message type information element, a MeNB UE X2AP ID information element, an SgNB UE X2AP ID information element, and a secondary base station usage report list information element,
The MeNB UE X2AP ID information element is information for the master base station to identify the terminal in an X2 interface control plane, and the SgNB UE X2AP ID information element allows the secondary base station to identify the terminal in an X2 interface control plane. Information for
The secondary base station usage report list information element,
Secondary base station including each field in the secondary base station usage report item, and the secondary base station usage report item having a value in a range from 1 to the maximum number of bearers. The method of claim 23,
The control unit,
The amount of downlink data is counted as bytes of PDCP SDUs successfully transmitted to the terminal through the secondary base station or bytes of PDCP SDUs transmitted to the terminal,
The secondary base station, characterized in that the amount of uplink data is counted in bytes of a PDCP SDU received by a node hosting a PDCP using radio resources of the secondary base station.

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