KR101652448B1 - METHOD FOR ALLOCATING ADDRESS OF USER EQUIPMENT IN 3GPP IPv6 AND APPARATUS THEREOF - Google Patents

Abstract

Disclosed is a method for allocating an IPv6 address of a terminal performed by a mobile termination (MT) of the terminal. The method for allocating an IPv6 address of a terminal can comprise: a step of establishing a packet data network (PDN) connection between the terminal and a network; a step of transmitting a router request produced by the MT to the network; a step of receiving a router advertisement including prefix from the network; a step of storing the received router advertisement in a router advertisement storage area of the MT; and a step of transmitting the received router advertisement to terminal equipment (TE) of the terminal.

Description

[0001] The present invention relates to a method and apparatus for assigning an address in a 3GPP IPv6 environment,

The present invention relates to a method of address allocation of a terminal in a 3GPP environment, and more particularly, to a method of shortening an address allocation time by reducing a transmission delay between a terminal equipment (TE) and a mobile terminal (MT).

With the development of technologies such as Internet of Things (IoT), various devices have become connected to the Internet. A device connected to the Internet requires an assigned Internet Protocol (IP) address. As the number of devices connected to the Internet increases, the conventional 32 bit IPv4 address is expected to be exhausted. In order to solve the address exhaustion, IPv6 having a 128-bit address has been proposed, and IPv6 is used under 3GPP and various computer OS (Operating System) environments.

IPv6 addresses are allocated by the stateless address autoconfiguration method. An IPv6 address can consist of a 64-bit subnet prefix and a 64-bit interface identifier. The subnet prefix can identify the subnet host to which the device is connected. The interface identifier is also an identifier of a host interface on the subnet, and can identify the device in the connected subnet.

As described above, all devices connected to the Internet (or network) need an IP address for identification. Thus, the allocation of a faster IP address can mean the initiation of faster communication. Therefore, there is a need for an IPv6 address allocation method capable of supporting a faster network connection.

The technical problem of the present invention is to provide a more improved IPv6 address allocation method by reducing transmission delay between TE-MT.

It is another object of the present invention to provide a method for reducing an IPv6 address allocation time by reducing an RS transmission time and an RA reception time between TE-MTs.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. .

According to an aspect of the present invention, there is provided a method for allocating an IPv6 address of a terminal performed by a Mobile Termination (MT) of a terminal according to an embodiment of the present invention, Data Network, PDN) connection; Sending a router request generated by the MT to the network; Receiving a Router Advertisement including a prefix from the network; Storing the received router advertisement in a router advertisement storage of the MT; And transmitting the received router advertisement to an information storage device (TE) of the terminal, wherein the prefix can be used to assign an IPv6 address to the TE.

According to embodiments of the present invention, it is possible to reduce the RS transmission delay between TE and MT.

Further, according to the embodiments of the present invention, it is possible to reduce the RA receive time between TE and MT.

In addition, according to embodiments of the present invention, the IPv6 allocation time of the terminal can be reduced.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a block diagram showing the configuration of a base station and a terminal in a wireless communication system.
2 is an exemplary diagram illustrating a network structure of an evolved universal mobile telecommunication system (E-UMTS).
3 is an exemplary diagram illustrating a structure of a wireless interface protocol in a control plane between a terminal and a base station.
4 is an exemplary diagram illustrating a structure of a wireless interface protocol in a user plane between a terminal and a base station.
5 is a diagram illustrating a relationship between a PDCCH (Physical Downlink Control Channel) and a PDSCH (Physical Downlink Shared Channel), which is a channel from a BS to a UE.
6 is a signal flow diagram illustrating a method of allocating IPv6 in a mobile communication system.
FIG. 7 is a flowchart of IPv6 address assignment in a terminal according to a conventional method.
8 is a flowchart of IPv6 address assignment in a UE according to an exemplary embodiment of the present invention.
9 is a flowchart of an IPv6 address assignment in a UE according to another embodiment of the present invention.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or characteristic may be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In this specification, a base station has a meaning as a network terminal node that directly communicates with a terminal. The specific operation described herein as being performed by the base station may be performed by an upper node of the base station, as the case may be. That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station.

In this specification, a 'base station (BS)' may be replaced by a term such as a fixed station, a Node B, an eNode B (eNB), an access point (AP) Repeaters can be replaced by terms such as Relay Node (RN), Relay Station (RS), and so on. The term 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), and Subscriber Station (SS).

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the IEEE 802 systems, 3GPP systems, 3GPP LTE and LTE-Advanced (LTE-Advanced) systems, and 3GPP2 systems, which are wireless access systems. That is, the steps or portions of the embodiments of the present invention that are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document. For example, embodiments of the present document may be described by standard documents such as 3GPP TS 23.060, 3GPP TS 29.061, 3GPP TS 24.301 and / or RFC 4862.

Embodiments of the present invention may also be implemented in a wireless communication system, such as a Code Division Multiple Access (CDMA), a Frequency Division Multiple Access (FDMA), a Time Division Multiple Access (TDMA), an Orthogonal Frequency Division Multiple Access (OFDMA), a Single Carrier Frequency Division Multiple Access) and the like. CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. The TDMA may be implemented in a wireless technology such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and E-Utra (Evolved UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE. WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system). For the sake of clarity, the 3GPP LTE and 3GPP LTE-A systems will be described below, but the technical idea of the present invention is not limited thereto.

In addition, specific terms used in the following description are provided to facilitate understanding of the present invention, and the use of such specific term can be changed into other forms without departing from the technical idea of the present invention.

1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100. As shown in FIG.

Although one base station 105 and one terminal 110 are shown to simplify the wireless communication system 100, the wireless communication system 100 may include one or more base stations and / or one or more terminals .

1, a base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit and receive antenna 130, a processor 180, a memory 185, a receiver 190, a symbol demodulator 195, and a receive data processor 197. The terminal 110 includes a transmission (Tx) data processor 165, a symbol modulator 170, a transmitter 175, a transmission / reception antenna 135, a processor 155, a memory 160, a receiver 140, A demodulator 155, and a receive data processor 150. Although the transmission / reception antennas 130 and 135 are shown as one in the base station 105 and the terminal 110, respectively, the base station 105 and the terminal 110 have a plurality of transmission / reception antennas. Therefore, the base station 105 and the terminal 110 according to the present invention support a Multiple Input Multiple Output (MIMO) system. Also, the base station 105 according to the present invention can support both a Single User-MIMO (MIMO) MU-MIMO (Multi User-MIMO) scheme.

On the downlink, the transmit data processor 115 receives traffic data, formats, codes, and interleaves and modulates (or symbol maps) the coded traffic data to generate modulation symbols Symbols "). A symbol modulator 120 receives and processes the data symbols and pilot symbols to provide a stream of symbols.

The symbol modulator 120 multiplexes the data and pilot symbols and transmits it to the transmitter 125. At this time, each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero. In each symbol period, the pilot symbols may be transmitted continuously. The pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.

Transmitter 125 receives the stream of symbols and converts it to one or more analog signals and further modulates (e.g., amplifies, filters, and frequency upconverts) The transmission antenna 130 transmits the generated downlink signal to the mobile station.

In the configuration of the terminal 110, the reception antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140. The receiver 140 adjusts (e.g., filters, amplifies, and downconverts) the received signal and digitizes the conditioned signal to obtain samples. The symbol demodulator 145 demodulates the received pilot symbols and provides it to the processor 155 for channel estimation.

Symbol demodulator 145 also receives a frequency response estimate for the downlink from processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is estimates of the transmitted data symbols) And provides data symbol estimates to a receive (Rx) data processor 150. [ The receive data processor 150 demodulates (i.e., symbol demaps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.

The processing by symbol demodulator 145 and received data processor 150 is complementary to processing by symbol modulator 120 and transmit data processor 115 at base station 105, respectively.

On the uplink, the terminal 110 processes the traffic data and provides data symbols. The symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175. A transmitter 175 receives and processes the stream of symbols to generate an uplink signal. The transmission antenna 135 transmits the generated uplink signal to the base station 105.

At base station 105, an uplink signal from terminal 110 is received via receive antenna 130 and a receiver 190 processes the received uplink signal to obtain samples. The symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink. The receive data processor 197 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.

The processors 155 and 180 of the terminal 110 and the base station 105 respectively instruct (for example, control, adjust, manage, etc.) the operation in the terminal 110 and the base station 105. Each of the processors 155 and 180 may be coupled with memory units 160 and 185 that store program codes and data. The memories 160 and 185 are connected to the processor 180 to store operating systems, applications, and general files.

The processors 155 and 180 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like. Meanwhile, the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof. (DSP), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and the like may be used to implement embodiments of the present invention using hardware, , FPGAs (field programmable gate arrays), and the like may be provided in the processors 155 and 180.

Meanwhile, when implementing embodiments of the present invention using firmware or software, firmware or software may be configured to include modules, procedures, or functions that perform the functions or operations of the present invention. Firmware or software configured to be stored in the memory 155 may be contained within the processor 155 or 180 or may be stored in the memory 160 or 185 and be driven by the processor 155 or 180. [

Layers of a wireless interface protocol between a terminal and a base station and a wireless communication system (network) are divided into a first layer (L1), a second layer (L2) based on the lower three layers of an open system interconnection ), And a third layer (L3). The physical layer belongs to the first layer and provides an information transmission service through a physical channel. An RRC (Radio Resource Control) layer belongs to the third layer and provides control radio resources between the UE and the network. The UE and the base station can exchange RRC messages through the RRC layer with the wireless communication network.

The processor 155 of the terminal and the processor 180 of the base station perform operations of processing signals and data except for the functions of the terminal 110 and the base station 105 to receive and transmit signals and the storage function, respectively But for the sake of convenience, the processors 155 and 180 are not specifically referred to hereafter. It may be said that the processor 155 or 180 performs a series of operations such as receiving and transmitting a signal and processing data instead of a storage function.

2 is an exemplary diagram illustrating a network structure of an evolved universal mobile telecommunications system (E-UMTS) as a mobile communication system.

As can be seen with reference to FIG. 2, the E-UMTS system is an evolved system in the existing UMTS system, and currently performs basic standardization work in 3GPP. The E-UMTS system may be referred to as an LTE (Long Term Evolution) system.

E-UMTS networks can be roughly divided into E-UTRAN and CN (Core Network). The E-UTRAN includes a User Equipment (UE) 10 and a Base Station (hereinafter abbreviated as eNode B) 21, 22 and 23 A serving gateway (hereinafter abbreviated as S-GW) 31, and a Mobility Management Entity (MME) 32 for managing the mobility of the UE. One eNode B 20 may have one or more cells.

The base station, for example, the eNodeB manages radio resources of one or more cells, and one cell is set to one of the bandwidths of 1.25, 2.5, 5, 10, 20Mhz and the like to provide downlink or uplink transmission services to a plurality of terminals. At this time, different cells may be set to provide different bandwidths. Cells can also be configured to overlap multiple cells geographically using multiple frequencies. The base station informs the terminal of basic information for accessing the network using system information (SI). The SI includes necessary information that the terminal needs to know in order to access the base station. Therefore, the terminal must receive all of the SI before accessing the base station, and always have the latest SI. Since the SI is information that all terminals in a cell must know, the base station periodically transmits the SI.

FIG. 3 is a diagram illustrating a structure of a radio interface protocol in a control plane between a terminal and a base station, and FIG. 4 is a diagram illustrating a structure of a radio interface protocol Fig.

The air interface protocol is based on the 3GPP radio access network standard. The wireless interface protocol horizontally comprises a physical layer, a data link layer, and a network layer, and vertically includes a user plane for data information transmission and a control plane And a control plane for signal transmission.

The protocol layers are classified into L1 (first layer), L2 (second layer) and L3 (third layer) based on the lower three layers of an Open System Interconnection (OSI) ).

Hereinafter, the wireless protocol of the control plane shown in FIG. 3 and the wireless protocol in the user plane shown in FIG. 4 will be described.

The physical layer, which is the first layer, provides an information transfer service using a physical channel. The physical layer is connected to an upper Medium Access Control layer through a transport channel, and data is transmitted between the medium access control layer and the physical layer through the transport channel. Data is transmitted between the different physical layers, that is, between the transmitting side and the receiving side physical layer through the physical channel.

A physical channel is composed of several subframes on the time axis and several subcarriers on the frequency axis. Here, one sub-frame is composed of a plurality of symbols and a plurality of sub-carriers on the time axis. One subframe is composed of a plurality of resource blocks, and one resource block is composed of a plurality of symbols and a plurality of subcarriers. One resource block is called a slot and has a length of 0.5 ms in terms of time. The transmission time interval (TTI), which is the unit time at which data is transmitted, is 1 ms corresponding to one subframe.

The physical channels existing in the physical layer of the transmitting side and the physical layer of the receiving side include a synchronization channel (SCH), a primary common control physical channel (PCCPCH), a secondary common control physical channel (SCCPCH), a dedicated physical channel (DPCH) Paging Indicator Channel), Physical Random Access Channel (PRACH), Physical Downlink Control Channel (PDCCH), and Physical Downlink Shared Channel (PDSCH).

The medium access control (MAC) of the second layer is connected to the transport channel from the physical layer, and a logical channel is allocated to the upper layer, that is, the radio link control layer. Lt; / RTI >

The downlink transmission channel for transmitting data from the network to the MS includes a BCH (Broadcast Channel) for transmitting system information, a PCH (Paging Channel) for transmitting a paging message, and a downlink SCH Channel. In case of a traffic or control message of a downlink multicast or broadcast service, it may be transmitted through a downlink SCH, or may be transmitted via a separate downlink multicast channel (MCH). On the other hand, the uplink transmission channel for transmitting data from the UE to the network includes RACH (Random Access Channel) for transmitting an initial control message and an uplink SCH (Shared Channel) for transmitting user traffic or control messages.

The logical channel is largely divided into a control channel for transmitting control plane information and a traffic channel for transmitting user plane information according to the type of information to be transmitted.

A logical channel that is located above the transport channel and mapped to a transport channel includes a broadcast channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH) Channel, a DCCH (Dedicated Control Channel), and the like.

The second layer of Radio Link Control (RLC) layer supports reliable data transmission and guarantees QoS (Quality of Service) of each radio bearer (RB) And is responsible for data transmission. The RLC has one or two independent RLC entities per RB in order to guarantee the QoS inherent to the RB. In order to support various QoS, the RLC has a Transparent mode, a UM (Unacknowledged Mode) Mode) and AM (Acknowledged Mode, response mode).

The PDCP layer of the second layer is a header compression that reduces the IP packet header size that contains relatively large and unnecessary control information in order to efficiently transmit the IP packet such as IPv4 or IPv6 in a wireless region having a small bandwidth. Header Compression function. The PDCP layer is also used to perform encryption of data on the control plane (C-plane), for example, an RRC message. The PDCP layer also encrypts U-plane data.

A Radio Resource Control (RRC) layer located at the uppermost layer of the third layer is defined only in the control plane and includes a configuration of a radio bearer (RB), a re- -configuration and release of the logical channel, the transport channel, and the physical channel. At this time, the RB means a service provided by the second layer for data transmission between the UE and the E-UTRAN.

If there is an RRC connection between the RRC of the UE and the RRC layer of the wireless network, the UE is in an RRC connected state, and if not, the UE is in an RRC idle mode.

A non-access stratum (NAS) layer located at an upper level of the RRC layer performs functions such as session management and mobility management.

The NAS layer shown in FIG. 3 will be described in detail below.

The eSM (Evolved Session Management) belonging to the NAS layer performs functions such as a default bearer management and a dedicated bearer management, and controls the terminal to use the PS service from the network. The default bearer resource is allocated from the network when it is first connected to a particular Packet Data Network (PDN) when connected to the network. At this time, the network allocates available IP addresses to the UE so that the UE can use the data service, and allocates the QoS of the default bearer. LTE supports two types of bearers: Guaranteed bit rate (GBR) QoS, which guarantees a specific bandwidth for data transmission and reception, and Non-GBR bearer with best effort QoS, without guaranteed bandwidth. The default bearer is assigned a non-GBR bearer. In the case of dedicated bearers, a bearer having QoS characteristics of GBR or non-GBR can be allocated.

A bearer assigned to a terminal in the network is called an evolved packet service (EPS) bearer. When assigning an EPS bearer, the network assigns an ID. This is called an EPS bearer ID. One EPS bearer has a QoS characteristic of a maximum bit rate (MBR) or / and a guaranteed bit rate (GBR).

5 is a diagram illustrating a relationship between a PDCCH (Physical Downlink Control Channel) and a PDSCH (Physical Downlink Shared Channel), which is a channel from a BS to a UE.

As can be seen from FIG. 5, in the downward direction from the base station to the mobile station, there are two types of physical channels: PDCCH and PDSCH.

The PDCCH is not directly related to transmission of user data, and control information necessary for operating a physical channel is transmitted. In the simplest case, the PDCCH may be used for controlling other physical channels. In particular, the PDCCH is used for transmission of information necessary for the UE to receive the PDSCH. At a certain point in time, information such as which data is transmitted using a specific frequency band, which terminal, what size of data is transmitted, and the like is transmitted through the PDCCH. Accordingly, each UE receives a PDCCH in a specific TTI (Transmit Time Interval), checks whether data to be received is to be transmitted through the PDCCH, and if it is notified that data to be received is transmitted, And receives the PDSCH using information such as the frequency indicated by the PDCCH. That is, information on how the data of the PDSCH is transmitted to which terminal (one or a plurality of terminals), information on how to receive and decode the data of the PDSCH, and the like are transmitted through a Physical Downlink Control (PDCCH) Channel) and transmitted.

On the other hand, in the above-mentioned mobile communication system, a service is provided using PS technology (Packet Switching). For this PS service, IP is used as a technology belonging to OSI 7 layer 3 layer, .

6 is a signal flow diagram illustrating a method of allocating IPv6 in a mobile communication system.

Basically, an IPv6 stateless address auto-configuration defined in an RFC (for example, RFC4862) is used in a mobile communication system such as LTE (Long Term Evolution), and a method for allocating an IPv6 address to a mobile station have. For example, the following describes an IPv6 address allocation method through an Attach procedure including a default bearer activation.

1) First, in order to receive a data service, the AT 200 transmits an Attach Request message including its own identification information, for example, International Mobile Subscriber Identification (IMSI) and its capability, To the MME 300. The information about the capability is included in the attach request message so that the terminal informs the MME of its own characteristics. As an example of the information on the capability, an encryption algorithm to be used for data transmission and reception may be an example. Meanwhile, the attach request message may include a PDN connection request message (PDN Connectivity Request message). The PDN connection request message includes an APN and a PDN type parameter. The PDN type parameter may include requested IP version information, for example, IPv6.

2) The MME 300 performs registration by transmitting information of the terminal, for example, identification information, to an HSS (Home Subscriber Server) 500 to register the current location of the terminal 200. This process may be omitted if the MME has not changed at the time when the terminal accesses the network.

3) Then, based on the information of the MS, the HSS 500 transmits a location update response message including an update location Ack message including the subscription information of the MS to the MME 300. The subscription information may include information such as an IP address, PDN type, and the like available for the UE.

4) Then, based on the received subscriber information (e.g., PDN type) and the access information (e.g., PDN type) requested by the terminal, the MME 300 transmits the PDN GW 400 and the S- ) To create a default bearer. During the creation of the basic bearer, the MME 300 obtains an IID (Interface ID) of the information for the terminal 200, for example, the version 6 IP address. Here, as described above, since the terminal requests IPv6, the PDN GW 400 assigns the IID of the version 6 IP address to the terminal.

Then, the MME 300 transmits an attach acknowledge message, for example, an Attach Accept message to the UE 200. The attach acknowledgment message may include an Activate Default EPS Bearer Context Request message. The Activate Default EPS Bearer Context Request message may include an APN and an IID (Interface ID).

5) Upon receiving the attach admission message, the terminal 200 transmits an attach complete message to the MME. The attach complete message may include an Activate Default EPS Bearer Context Accept message.

Meanwhile, the MS 200 checks the Activate Default EPS Bearer Context Request message included in the attach acknowledgment message and transmits the 64-bit IID (Interface ID) and an arbitrary 64-bit prefix (e.g., fe80: To generate a 128-bit IPv6 address (64-bit prefix + 64-bit IID). The address of the IPV6 thus generated is a link-local address (LLA), and the terminal can communicate with other terminals (or routers) belonging to the same subnet (or the same network link) For example, if the IID value is 1: 2: 3: 4, the terminal generates an LLA value of fe80 :: 1: 2: 3: 4.

For reference, an IPv4 address has a size of 16 bits, and a display method has four digits separated by '.' (Dot) like 2341.128.2.1, and one digit has a decimal value of 0 to 255, The IPv6 address has a size of 128 bits, and the display method has an 8-digit value divided into ':' (colon) such as 2001: a121: e43: f2e4: 2e0: 91ff: fe10: 4f5b. In hexadecimal format. At this time, '::' (double colon) is indicated for consecutive zero values such as 2001: 0: 0: 0: 2e0: 91ff: fe10: 4f5b. That is, the value of 2001 :: 2e0: 91ff: fe10: 4f5b means the same address as 2001: 0: 0: 0: 2e0: 91ff: fe10: 4f5b.

6). When the terminal 200 generates the IPv6 address, the terminal 200 performs Duplicate Address Detection (DAD) according to the RFC standard to check whether the generated address does not overlap with the neighboring terminal , An unspecified address ('::') is designated as a destination address and a Neighbor Solicitation (NS) including a destination address (for example, A :: B) ) Message to the P-GW (400). When receiving the neighbor advertisement (NA) from another terminal (or router) after a certain time after sending the NS, the source address included in the NA is confirmed. If the source address (e.g., A :: B) included in the NA is the same as the LLA address generated by the terminal, it means that other terminals (or routers) using the same address as the terminal exist in the same network, The terminal performs a procedure for generating another address.

7) The terminal 200 receives a Router Advertisement (RA) message from the P-GW 400. The RA message includes an address of the P-GW 400 as a source address, and may include an LLA of the terminal as a destination address. The RA message may include an IPv6 prefix.

Meanwhile, the RA message may be periodically transmitted to the UE.

Or the terminal 200 as shown may send a Router Solicitation (RS) message to the P-GW 400 to acknowledge the router and receive the RA as its response.

The terminal and the PDN GW 400 belong to the same sub-network with a 1-hop distance, and the RS message and the RA message can use the LLA as a source address and a destination address.

When the terminal transmits the RS message, the destination address ff02 :: 2 in the RS message indicates all routers (link-local scope all-routers) in the link local area. In FIG. 6, when the UE transmits the RS message, since the UE does not know the destination address of the router, an example using ff02 :: 2 for obtaining the RA is shown. Herein, the P-GW receives the RS message from the terminal and uses the IID value assigned by the source address of the received RS message. Therefore, the P-GW transmits the prefix value corresponding to the received IID value to the RA Message. This process is also referred to as the router discovery process in RFCs.

8) On the other hand, the terminal 200 generates a 128-bit global address using the 64-bit prefix value in the received RA message and the allocated 64-bit IID value.

In the above, it is described according to the RFC standard that the version 6 IP address is allocated. However, in LTE, the P-GW assigns globally unique prefix to the terminal. In addition, in the LTE, a silver IID value allocated by the P-GW must be used. Alternatively, however, the IID value may not be allocated in the P-GW, but may be a value arbitrarily generated by the terminal.

9) Meanwhile, the P-GW periodically transmits a Router Advertisement message to the terminal to update the validity of the version 6 IP address assigned to the terminal.

Hereinafter, an IPv6 address assignment process in the UE will be described with reference to FIG. An IPv6 (Internet Protocol version 6) address allocation scheme of a User Equipment (UE) in a 3GPP (3rd Generation Partnership Project) environment is as shown in FIG. A terminal may include an information storage device (TE) and a mobile terminal device (MT). The MT is a part where a radio access protocol for communicating over a radio section is located, and the TE can provide a control function necessary for operation of the radio access protocol.

The IPv6 address in the 3GPP environment can be allocated by the IPv6 stateless address autoconfiguration scheme (for example, the scheme described in document RFC 4862). The MS establishes a new Packet Data Network (PDN) connection and allocates an IPv6 address through the IPv6 stateless address automatic generation method (using a 64-bit (prefix) prefix ).

More specifically, a network within a specific context of a Universal Mobile Telecommunication System (UMTS) (e.g., point-to-point connection, radio resource efficiency, etc.) A PDP (Packet Data Protocol) context to which each PDP should assign a unique prefix within its own range.

First, a primary PDP context activation process or a default bearer activation process is performed between the MT of the UE and the network. For example, to automatically configure IPv6 stateless address, the terminal transmits an Activate PDP Context Request to the network. Upon receipt of the PDP context creation request, the network generates an IPv6 address consisting of a prefix assigned to the PDP context and an interface identifier generated by the Gateway GSPR Supported Node (GGSN). The generated address is returned in the PDP address information element in the Create PDP Context Response message.

The UE receives the IPv6 address generated by the GGSN in the Activate PDP Context Accept. For example, the terminal may receive a 64-bit prefix from a Router Advertisement (RA) message from the network. In addition, the terminal may send a Router Solicitation (RS) message to the network to activate the transmission of the Router Advertisement (RA) message. This Router Solicitation (RS) message is generated by the TE in the terminal and is transmitted by the MT.

The network may send a Router Advertisement (RA) message. The network may send a Router Advertisement (RA) message in response to a Router Solicitation (RS) or periodically. The TE receives the Router Advertisement (RA) message from the network through the MT. After receiving the Router Advertisement (RA) message, the terminal may configure the complete IPv6 address by associating the received interface identifier or the prefix received via the Router Advertisement (RA) with the locally-generated interface identifier.

Therefore, as shown in FIG. 7, after the PDN connection procedure of MT (Mobile Termination) in the UE, the TE in the UE transmits a router request (RS) to the network through the MT. Also, the TE can receive the Router Advertisement (RA) from the network through the MT and receive the IPv6 address. Therefore, a router request (RS) transmission delay between the TE and MT internally occurs in the UE. Therefore, an IPv6 address allocation method capable of reducing the RS transmission delay is required.

8 is a flowchart of IPv6 address assignment in a UE according to an exemplary embodiment of the present invention.

In order to reduce the transmission delay between the TE-MTs as described above, the introduction of a router advertisement (RA) repository in the MT is proposed. In its initial state, the RA store is empty. As described below, the MT may store router advertisements (RA) received from the network in a router advertisement (RA) store and also update the RA store.

First, the MT may perform a primary PDP context activation (3G) or a default bearer activation (4G) procedure with the network to establish a PDN connection (S801). In addition, the MT may generate a router request (RS) using the link-local address generated in the PDN connection process and transmit the generated router request (RS) to the network (S802). If MT receives a router request (RS) from the TE before receiving a router advertisement (RA) from the network (S803), it records router request (RS) information received from the TE and discards the router request (RS) .

The MT may receive a Router Advertisement (RA) from the network, store the received Router Advertisement (RA) in the RA RA store of the MT and send a Router Advertisement (RA) to the TE (S804). In this case, the MT may send a Router Advertisement (RA) to the TE if there is a Router Solicitation (RS) received from the TE prior to receiving the Router Advertisement (RA).

The TE may receive the router advertisement (RA) from the MT and allocate an IPv6 address using the 64-bit prefix in the router advertisement (RA) (S805). For example, the TE may be assigned an IPv6 address by combining the interface identifier and the prefix. For example, if the prefix of the router advertisement RA is 11:22:33:44 and the interface identifier is A1: B1: C1: D1, the assigned IPv6 address is 11: 22: 33: 44: A1: B1 : C1: D1. Also, after the assignment of the IPv6 address (S805), the MT sends a Router Advertisement (RA) stored in the RA store to the TE for the Router Request (RS) transmitted from the TE to the MT, and the received Router Request It can be discarded. Also, in response to receiving the Router Advertisement (RA) from the network, the MT may update the RA Store using the received Router Advertisement (RA) and send the Router Advertisement (RA) received on the TE.

In this embodiment, the router request is transmitted from the MT to the network (S802) before the router request (RS) from the TE is received (S803). Thus, the transmission delay for the MT to receive a Router Solicitation (RS) from the TE before transmission of the Router Solicitation (RS) may be reduced.

9 is a flowchart of an IPv6 address assignment in a UE according to another embodiment of the present invention.

9, the MT establishes a PDN connection with the network (S901), generates and sends a router request (RS) to the network (S902), stores the router advertisement (RA) received from the network in the router store, (S903). Also, the TE can receive the IPv6 address (S904) using the 64 bit prefix of the router advertisement (RA) received from the MT. Therefore, the embodiment of FIG. 9 is similar to the embodiment of FIG. 8, but differs in that the process of receiving the router request (RS) from the TE (S803 of FIG. 8) is omitted. Thus, the MT may send the received Router Advertisement (RA) to the TE upon receipt of the Router Advertisement (RA) from the network, despite the receipt of the Router Request (RS) from the TE.

After the assignment of the IPv6 address (S804), the MT sends a Router Advertisement (RA) stored in the RA store to the TE for the Router Request (RS) transmitted from the TE to the MT, and the received Router Request (RS) It can be discarded. Also, in response to receiving the Router Advertisement (RA) from the network, the MT may update the RA Store using the received Router Advertisement (RA) and send the Router Advertisement (RA) received on the TE.

According to the embodiment described above with reference to Figures 8 and 9, it is possible to reduce the TE-MT Router Solicitation (RS) transmission delay. Thus, in the 3GPP environment, the MT can shorten the time for packet data communication by sending a Router Solicitation (RS). Also, in the case of Windows XP, a time reduction effect of about 20 ms to 40 ms can be obtained by causing the MT to transmit a router request (RS).

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (7)

A method for allocating an IPv6 address of a terminal performed by a mobile terminal (MT) of a terminal,
Establishing a Packet Data Network (PDN) connection between the terminal and the network;
Sending a router request generated by the MT to the network;
Receiving a Router Advertisement including a prefix from the network;
Storing the received router advertisement in a router advertisement storage of the MT; And
And transmitting the stored router advertisement to an information storage device (TE) of the terminal,
Wherein the prefix is used to assign an IPv6 address to the TE,
A method of allocating an IPv6 address of a terminal,
Recording information of a router request received from the TE when a router request is received from the TE before the router advertisement is received; And
Further comprising the step of discarding a router request received from the TE after the information is recorded. The method according to claim 1,
Wherein the PDN connection is established by performing a Primary PDP Context Activation or a Default Bearer Activation. The method according to claim 1,
Wherein the router request is generated using a link-local address obtained from the established PDN connection. delete The method according to claim 1,
Sending a Router Advertisement stored in the Router Advertisement Store to the TE when a router request is received from the TE after the Router Advertisement is stored; And
And discarding a router request received from the TE. The method according to claim 1,
Further comprising updating a router advertisement stored in the router advertisement store using a new router advertisement received from the network when a new router advertisement is received from the network after the router advertisement is stored, . The method according to claim 1,
Wherein the router advertisement received from the network is received in response to transmission of the MT's router request or periodically received from the network.

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