WO2017196106A1

WO2017196106A1 - Method for interworking between heterogeneous radio access networks and apparatus therefor

Info

Publication number: WO2017196106A1
Application number: PCT/KR2017/004894
Authority: WO
Inventors: 김하성
Original assignee: 주식회사 케이티
Priority date: 2016-05-13
Filing date: 2017-05-11
Publication date: 2017-11-16

Abstract

The present embodiments relate to a method and an apparatus for interworking between 5G and LTE/LTE-advanced radio access networks (RANs) in a 5G network capable of a flow packet based-QoS control in order to provide various packet QoSs. The present embodiments can further flexibly and precisely provide various 5G services having various requirements and QoS characteristics through interworking between flow packet-based 5G and LTE/LTE-advanced base stations, and can provide stable connectivity through efficient interworking between the 5G and LTE/LTE-advanced base stations.

Description

Interworking method between heterogeneous wireless access networks and device therefor

The present embodiments relate to a method and apparatus for interworking between heterogeneous radio access networks, and more particularly, to a method and apparatus for interworking between 5G and LTE / LTE-Advanced radio access networks.

The existing LTE / LTE-Advanced wireless access network uses the EPS bearer as a basic unit to perform QoS control at the bearer level. Therefore, in the core network, a plurality of traffic flows are mapped to EPS bearers, and QoS parameters of the bearer level are allocated to the radio access network. Accordingly, the radio access network performs radio bearer control and QoS control of the corresponding level.

Meanwhile, in 5G, which is introduced in the future, the existing bearer level QoS control scheme is provided to provide more flexible and detailed services with various transmission speed, reliability, latency requirements and QoS characteristics based on network slicing technology. More granular flow-based packet control will also be introduced.

However, the conventional bearer packet control based 5G and the LTE / LTE-Advanced base station interworking method is insufficient support for the flow control consideration is necessary. In particular, in the early stages of introduction and construction of 5G wireless access networks, natural interworking with existing LTE / LTE-Advanced wireless access networks will be very important to provide stable services.

An object of the present embodiments is to provide a method and apparatus for interworking between 5G and LTE / LTE-Advanced radio access network on a 5G network capable of flow packet-based QoS control for providing various packet QoS.

In one aspect, embodiments of the present invention provide a method for interworking between heterogeneous radio access networks, in which a master base station receives a quality of service policy from a core network connected to a master base station and a secondary base station, and receives one or more packet flows from the core network. And mapping one or more packet flows to at least one of a radio flow and a radio bearer based on the quality of service policy.

In another aspect, the embodiments of the present invention provide a method for interworking between heterogeneous radio access networks, the terminal transmitting a packet flow to a core network, and mapping between the packet flow and the radio bearer based on a flow identifier assigned by the core network. Receiving a message from the master base station or the secondary base station performing the step, and transmitting a message including the flow identifier and the bearer identifier to the core network.

In another aspect, the embodiments of the present invention, in the initial connection setting method when interworking between heterogeneous wireless access network, the terminal for the connection with the master base station transmits a connection request message to the core network, and assigned by the core network A method comprising the steps of: receiving a connection reestablishment message from a secondary base station that performs a mapping between a flow and a radio bearer based on a flow identifier, and transmitting a connection reestablishment complete message to the secondary base station.

According to the present embodiments, the flow packet-based 5G and LTE / LTE-Advanced base station interworking enables to provide more flexible and detailed services having various requirements and QoS characteristics of 5G.

In addition, efficient linkage between 5G and LTE / LTE-Advanced base stations provides more reliable connectivity and reduces deployment and operating costs.

FIG. 1 is a diagram illustrating a case where a 5G radio access network is a master base station in a core and a radio access network structure when 5G and LTE / LTE-Advanced interworking.

FIG. 2 is a diagram illustrating a case where an LTE / LTE-Advanced radio access network is a master base station in a core and a radio access network structure when 5G and LTE / LTE-Advanced interwork.

3 is a diagram illustrating an example of a process for interworking between heterogeneous wireless access networks according to the present embodiments.

4 is a diagram illustrating another example of a method of interworking between heterogeneous wireless access networks according to the present embodiments.

5 is a diagram illustrating an example of an initial connection establishment procedure in a method of interworking between heterogeneous wireless access networks according to the present embodiments.

6 is a diagram illustrating a configuration of a base station according to the present embodiments.

7 is a diagram illustrating a configuration of a user terminal according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

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

In other words, in the present specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations. Alternatively, in the present specification, the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or supports UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or lower power consumption). low complexity) can mean UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition, user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.

A base station or cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an eNB, 5G, a sector, and a site. Other terms such as Site, Base Transceiver System (BTS), Access Point, Access Node, Relay Node, Remote Radio Head (RRH), Radio Unit (RU), and small cell may be referred to.

That is, in the present specification, a base station or a cell includes some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or sector (site) in LTE, a gNB in 5G, and the like. It should be interpreted in a comprehensive sense, which encompasses various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station. The eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, and the like, according to the configuration of the radio region, become an embodiment of the base station. In ii), the base station may indicate the radio area itself to receive or transmit a signal from the viewpoint of the user terminal or the position of a neighboring base station.

Accordingly, the base station is collectively referred to as a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, a gNB, a transmission / reception point, a transmission point, and a reception point. Refer to.

In the present specification, the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to. The user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in systems such as LTE and LTE-Advanced, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. The uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like. Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

On the other hand, control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

A wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal. antenna transmission system), a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission / reception points and terminals.

The multiple transmit / receive point is at least one having a high transmission power or a low transmission power in a macro cell region, which is connected to an eNB or a macro cell (hereinafter referred to as an 'eNB') and wired controlled by an optical cable or an optical fiber to an eNB. May be RRH.

In the following, downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal, and uplink refers to a communication or communication path from a terminal to multiple transmission / reception points. In downlink, a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.'

In addition, hereinafter, a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.

In addition, for convenience of description, the EPDCCH, which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the PDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.

Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.

The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

The background technology of the present invention is a 5G network, a radio flow control, a radio access network, and an interworking technology between 5G and LTE / LTE-Advanced.

Based on network slicing technology in 5G, flow-based packets more detailed than the existing bearer level QoS control method to provide more flexible and detailed services with various transmission speed, reliability, latency requirements and QoS characteristics. Although control will be additionally introduced, the interworking method between 5G and LTE / LTE-Advanced base station based on the existing bearer packet control needs to support the function because flow consideration is insufficient. In particular, in the early stages of introduction and construction of 5G wireless access networks, natural interworking with existing LTE / LTE-Advanced wireless access networks will be very important for stable service provision.

An object of the present invention is to provide a method and apparatus for interworking between 5G and LTE / LTE-Advanced radio access networks on a 5G network capable of controlling flow packet-based QoS for providing various packet QoS.

The 5G network is divided into a core network (CN) and a radio access network (RAN). The terminal assumes a dual mode terminal capable of connecting to both 5G and LTE / LTE-Advanced base station.

The 5G Core Network (CN) is divided into a Control Plane (CP) and a User Plane (UP) function, and is composed of 5G CN-CP and 5G CN-UP devices, respectively. The interface between the 5G CN-CP and 5G CN-UP devices is connected via the manufacturer's own or standardized interface.

It is assumed that the 5G core network is capable of supporting both 5G and LTE (or evolved LTE) base stations. In addition, the interface between 5G core network and 5G / LTE / LTE-Advanced radio access network is interworked with eS1 (Enhanced S1).

The 5G base station or the LTE / LTE-Advanced base station may be the master base station according to the operator's wireless access network deployment scenario. Here, the master base station is connected to the 5G CN-CP device through the eS1-CP interface, and both the master base station and the secondary base station are connected to the 5G CN-UP device through the eS1-UP interface.

FIG. 1 illustrates a case in which 5G and LTE / LTE-Advanced wireless access networks serve as a master base station in a non-standalone interworking structure, and FIG. 2 illustrates 5G and LTE / The LTE-Advanced radio access network is a network structure when the LTE / LTE-Advanced radio access network 300 serves as a master base station in a non-standalone interworking structure.

Multiple packet flows according to various services are delivered from the PDN to the 5G core network 100.

The 5G CN-CP 110 generates a QoS policy, performs a storage function, and delivers it to the 5G CN-UP 120 and the master base station.

It is assumed that 5G and LTE / LTE-Advanced radio access networks support 1) control of a radio bearer, 2) control of a radio flow, or both.

1) When the radio access network (RAN) controls the radio bearer unit:

The master base station may merge 1) a plurality of flows received from the 5G core network 100 to generate a new radio flow (if necessary), and 2) map, convert, and generate a radio flow and a radio bearer.

2) When the radio access network (RAN) controls radio flow units:

The master base station 1) merges a plurality of flows received from the 5G core network 100 to generate a new radio flow (if necessary), 2) maps and generates a core network flow to the radio flow, and 3) for the radio flows. Determine your priorities. In particular, high priority can be given to high priority flows such as RRC signaling messages.

3 illustrates an example of a method for interworking between 5G and LTE / LTE-Advanced radio access networks according to the present embodiments.

Referring to FIG. 3, the master base station receives a QoS policy from the 5G core network 100 among the 5G radio access network 200 and the LTE / LTE-Advanced radio access network 300 (S300).

Then, the master base station receives the packet flow from the 5G core network 100 (S310), if necessary, merges the received packet flows to generate a new flow (S320).

The master base station maps the packet flows to the radio flow or the radio bearer based on the QoS policy received from the 5G core network 100 (S330), and performs the control of the radio flow unit or the control of the radio bearer unit.

Here, the master base station may transmit a flow identifier assigned by the 5G core network 100 to the terminal 400, the terminal 400 transmits a message including the flow identifier and the bearer identifier to the 5G core network 100 Can be.

In addition, a procedure for setting and requesting a QoS policy may be performed between the 5G core network 100, the master base station, the secondary base station, and the terminal 400.

By doing this, by interworking between the packet flow-based 5G radio access network 200 and the LTE / LTE-Advanced radio access network 300, to provide a variety of services with a variety of requirements and QoS characteristics of 5G more flexible and detailed Do it.

On the other hand, the mapping of the packet flow may be performed in two steps: mapping to the wireless flow and the radio bearer.

4 shows another example of a process of an interworking method between 5G and LTE / LTE-Advanced wireless access network according to the present embodiments.

Referring to FIG. 4, the master base station among the 5G radio access network 200 and the LTE / LTE-Advanced radio access network 300 receives a QoS policy from the 5G core network 100 (S400).

Then, the master base station receives the packet flow from the 5G core network 100 (S410).

The master base station maps the packet flow received from the 5G core network 100 to the radio flow based on the QoS policy (S420), and maps the radio flow to the radio bearer (S430).

Here, the 5G core network 100 may map the packet flow received from the terminal to the radio flow, and the master base station may map the radio flow mapped by the 5G core network 100 to the radio bearer.

The 5G core network 100 may assign a flow identifier and the allocated flow identifier may be transmitted to the terminal 400 by the master base station, and the terminal 400 sends a message including the flow identifier and the bearer identifier to the 5G core network ( 100).

This packet flow-based control enables stable interworking between the 5G radio access network 200 and the LTE / LTE-Advanced radio access network 300, and provides various services having various QoS characteristics more flexibly and precisely. do.

5 illustrates an example of an initial connection establishment procedure when interworking between 5G and LTE / LTE-Advanced wireless access network according to the present embodiments.

Referring to FIG. 5, in a non-independent interworking scenario between the 5G radio access network 200 and the LTE / LTE-Advanced radio access network 300, the 5G RRC initial connection setup procedure is performed by the terminal 400 in LTE / LTE-Advanced. 5G RRC signaling is transmitted through the base station 300, and a specific initial connection setup procedure is as follows.

1. The LTE / LTE-Advanced base station 300 broadcasts and transmits system information to the terminal 400 (S500).

2. The terminal 400 transmits a PDN Connectivity Request message to the 5G CN-CP 110 (S501). At this time, the terminal 400 requests a dedicated flow for 5G RRC connection. Here, the flows may be classified in detail according to the purpose of use, attributes, and the like (eg, signaling flow, MBB data flow, URLLC data flow, mMTC data flow, etc.).

3. The 5G CN-CP 110 allocates a flow ID and transmits a Create Session Request message to the PDN 500 (S502).

4. The PDN 500 responds to the 5G CN-CP 110 with a Create Session Response message (S503).

5. A flow QoS policy is set and a request procedure is performed between the 5G CN-CP 110, the 5G CN-UP 120, the

RAN

200 and 300, and the terminal 400 (S504).

6. The 5G CN-CP 110 transmits to the terminal 400 including the PDN Connectivity Accept in the Flow Setup Request message (S505).

7. The LTE / LTE-Advanced and 5G radio access networks perform the mapping and conversion procedure between the flow and the radio bearer as needed according to the QoS control method (S506).

8. The LTE / LTE-Advanced base station 300 transmits an RRC Connection Reconfiguration including a PDN Connectivity Accept message to the terminal 400 (S507).

9. The terminal 400 transmits an RRC Connection Reconfiguration Complete to the LTE / LTE-Advanced base station 300 (S508).

10. The LTE / LTE-Advanced base station 300 transmits a flow setup response message to the 5G CN-CP 110 (S509).

11. The terminal 400 configures a bearer ID and a flow ID and transmits a PDN Connectivity Complete message to the 5G CN-CP 110 (S510).

12. When the terminal 400 acquires PDN address information, the terminal 400 transmits a 5G RRC message to the 5G base station 200 through the LTE / LTE-Advanced base station 300 (S511).

As described above, according to the present invention, 5G based on flow packet control and LTE / LTE-Advanced base station interworking will be able to provide more flexible and detailed services having various requirements and QoS characteristics of 5G. In addition, efficient linkage between 5G and LTE / LTE-Advanced base stations provides more reliable connectivity and lowers deployment and operation costs.

6 shows a configuration of a base station 600 according to the present embodiments.

Referring to FIG. 6, the base station 600 according to the present embodiments includes a controller 610, a transmitter 620, and a receiver 630.

According to the above-described present invention, the control unit 610 provides a more flexible and detailed method for providing various services having various requirements and QoS characteristics of 5G through 5G based on flow packet control and LTE / LTE-Advanced base station interworking. The overall operation of the base station 600 is controlled.

The transmitter 620 and the receiver 630 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention described above.

7 illustrates a configuration of a user terminal 700 according to the present embodiments.

Referring to FIG. 7, the user terminal 700 according to the present exemplary embodiments includes a receiver 710, a controller 720, and a transmitter 730.

The receiver 710 receives downlink control information, data, and a message from a base station through a corresponding channel.

In addition, the control unit 720, in accordance with the present invention described above through the flow packet control based 5G and LTE / LTE-Advanced base station interworking to provide a variety of services having a variety of requirements and QoS characteristics of 5G more flexible and detailed The overall operation of the user terminal 700 according to the control.

The transmitter 730 transmits uplink control information, data, and a message to a base station through a corresponding channel.

The standard contents or standard documents mentioned in the above embodiments are omitted to simplify the description of the specification and form a part of the present specification. Therefore, the addition of the contents of the standard and part of the standard documents to the specification or the description in the claims should be construed as falling within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATIONCROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with the Patent Application No. 10-2016-0059079 filed in Korea on May 13, 2016 and the patent application No. 10-2017-0055128 filed in Korea on April 28, 2017. Priority is claimed under section (a) (35 USC § 119 (a)), all of which is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

In the interworking method between heterogeneous radio access networks,

Receiving, by a master base station, a quality of service policy from a core network connected with the master base station and the secondary base station;

Receiving one or more packet flows from the core network; And

Mapping the one or more packet flows to at least one of a radio flow and a radio bearer based on the quality of service policy.
The method of claim 1,

Mapping the one or more packet flows to at least one of a radio flow and a radio bearer,

Mapping the packet flow to the wireless flow; And

Mapping the radio flow to the radio bearer.
The method of claim 1,

The core network receives a packet flow from a terminal and maps the received packet flow to a wireless flow.
The method of claim 3,

The master base station maps the radio flow mapped by the core network to a radio bearer.
The method of claim 1,

The master base station transmits a flow identifier assigned by the core network to the terminal.
The method of claim 1,

And the core network receives a message including a flow identifier and a bearer identifier from a terminal.
The method of claim 1,

And setting and requesting the quality of service policy between the core network, the master base station, the secondary base station, and a terminal.
In the interworking method between heterogeneous radio access networks,

Transmitting, by the terminal, the packet flow to the core network;

Receiving a message from a master base station or a secondary base station that has performed mapping between the packet flow and the radio bearer based on the flow identifier assigned by the core network; And

Sending a message comprising the flow identifier and a bearer identifier to the core network.
The method of claim 8,

The master base station or the secondary base station maps the packet flow to a radio flow and the radio flow to the radio bearer.
The method of claim 8,

The core network maps the packet flow to a radio flow, and the master base station or the secondary base station maps the radio flow to the radio bearer.
The method of claim 8,

The terminal receiving the flow identifier assigned by the core network from the master base station or the secondary base station.
The method of claim 8,

And setting and requesting a quality of service policy between the core network, the master base station, the secondary base station, and the terminal.
In the initial connection setting method when interworking between heterogeneous wireless access networks,

Transmitting, by the terminal for connection with the master base station, a connection request message to the core network;

Receiving a connection reestablishment message from a secondary base station which has performed mapping between a flow and a radio bearer based on the flow identifier assigned by the core network; And

Sending a connection reset complete message to the secondary base station.
The method of claim 13,

And the master base station and the secondary base station map the flow to a radio flow and the radio flow to the radio bearer.
The method of claim 13,

Transmitting, by the terminal, a message including the flow identifier and a bearer identifier to the core network.