KR20050122937A - Information transfer method for data transmission in mobile communication syystem - Google Patents

Abstract

The present invention provides an information transmission method of a terminal for transmitting downlink data in a mobile communication system and an operation method of a base station for supporting the same. The present invention provides a mobile communication system for transmitting a predetermined address request message to a base station so that a router can determine a link layer address of a terminal using a destination network address in order to deliver downlink data to a terminal in a normal reception mode. The base station broadcasts the address request message transmitted from the router to a plurality of terminals, and transmits a response message received from the plurality of terminals to the router. In addition, when the base station receives an address request message for determining a link layer address of the terminal using a destination network address from the router, the base station directly transmits a response message for the address request message to the router.

Description

Information transmission method for data transmission in mobile communication system {INFORMATION TRANSFER METHOD FOR DATA TRANSMISSION IN MOBILE COMMUNICATION SYYSTEM}

The present invention relates to a mobile communication system, and more particularly, to an information transmission method for transmitting downlink data and an operation method of a base station for supporting the same.

In general, a mobile communication system supports an idle mode in order to minimize power consumption of a mobile / fixed terminal (hereinafter, abbreviated to terminal). A paging zone is an entire area that a plurality of base stations, called call groups, are in charge of. The base stations included in the same paging area have the same paging cycle and paging offset.

The terminal may request the base station to switch to idle mode through a DREG-REQ message as shown in FIG. 1, and the base station responds with its paging-group ID, call cycle, and call offset in response. It is delivered to the terminal so that the terminal can switch to the idle mode. During the idle mode, the terminal may determine whether to maintain or terminate the idle mode through paging transmitted in the form of a broadcast from the base station for each promised call period.

If there is traffic to be transmitted by the terminal in the idle mode, the terminal may terminate the idle mode at any time, and when the traffic to be delivered to the terminal in the idle mode occurs, the base station causes the terminal to call the idle mode. Can be terminated. When the terminal in the idle mode does not receive a call at a predetermined time due to moving to another call area or losing synchronization, the terminal ends the idle mode.

In addition, the mobile communication system supports the sleep mode to minimize power consumption of the mobile / fixed terminal.

The terminal transmits a sleep request message (MOB-SLP-REQ) as shown in FIG. 2 to the base station, requests a transition to the sleep state, receives a sleep response message (MOB-SLP-RSP) from the base station, and transitions to the sleep mode. . The sleep request message and the sleep response message may include a start time, a minimum and maximum sleep interval (frame unit) at which the terminal can stay in a sleep state, and a listening period of receiving a signal from the base station again after waking from the sleep state. ) Values.

At the end of the sleep cycle of the terminal, the base station transmits a traffic indication message (MOB-TRF-IND) to the terminal and notifies whether the traffic to be transmitted to the terminal has occurred. If the MOB-TRF-IND is notified that no new traffic has appeared, the terminal may return to the sleep state again.

Hereinafter, the idle mode, the sleep mode, the packet transmission and the ARP operation in the mobile communication system according to the prior art will be described in more detail.

3 is a diagram illustrating an example in which data to be received downward is generated when the terminal enters the idle mode at the request of the terminal, and thus the terminal switches from the idle mode to the normal mode. In this case, the terminal receives the data and enters the normal mode.)

Referring to FIG. 3, in order to transition to the idle mode, the terminal MSS performs a registration cancellation procedure with a base station (BS # 1-host base station) (S10). Here, DREG-REQ and DREG-CMD are a registration request message and a registration command, respectively.

The base station BS # 1 performing the deregistration procedure by the terminal MSS notifies the base stations BS # 2 and BS # 3 in the same calling area that the terminal MSS has transitioned to the idle mode (S11). ), Each of the base stations BS # 2 and BS # 3 registers the MAC address of the MSS included in the paging announce of the base station BS # 1 in its paging list. This paging list is shared by all base stations in the same calling area.

Thereafter, when data (downlink traffic) to be delivered to the MSS arrives, the host BS BS # 1 sends the UE to other BSs BS # 2 and BS # 3 within the same calling area through the call notification. Inform that the data to be delivered to the MSS has arrived (S12). Accordingly, each of the base stations BS # 2 and BS # 3 calls the MSS during the call period using the MAC address included in the call notification of the base station BS # 1 (S13). That is, each base station transmits a call message to the terminal.

The terminal receives a call message from the base stations (BS # 2, BS # 3), if the action code of the call message transmitted from the base station (BS # 3) to the initial network entry (initial network entry) If it is set to "10", a ranging procedure and an initial network access procedure are performed to access the base station BS # 3 (S14 and S15). Here, RNG-REQ is a ranging request message and RNG-RSP is a ranging response message.

Therefore, when the initial network entry procedure of the terminal MSS is completed, the base station BS # 3 transmits downlink data to the terminal MSS connected to the network (S16).

4 is a diagram illustrating an example in which a terminal is switched to a normal mode because there is data to be received downward in a state of entering a sleep mode at the request of a terminal. (And, even when the terminal enters the sleep mode by the command of the base station, the terminal receives the data and is converted to the normal mode.)

As shown in FIG. 4, the terminal MSS transmits a sleep request message (MOB-SLP-REQ) to the base station BS in order to transition to the sleep mode (S20), and the base station BS transmits the terminal MSS. In response to the sleep request, the sleep response message (MOB-SLP-RSP) is transmitted (S21). In this case, the MOB-SLP-RSP includes a sleep start time (M), a minimum and maximum sleep period (N1, N2), a listening period (L1), etc. in units of frames.

The terminal MSS enters the sleep mode during the first sleep period N1 determined in the sleep request / response procedures S20 and S21, and the base station BS listens to the listening period determined in the sleep request / response procedures S20 and S21. The traffic indicator (MOB-TRF-IND) is transmitted to the terminal during L1) (S22). Here, the traffic indicator is used to inform the negative / positive of downlink data to be received by the terminal.

Accordingly, the terminal MSS listens to the traffic indicator MOB-TRF-IND transmitted from the base station during the listening period L1 and checks whether there is downlink data to be received. As a result of the check, when the traffic indicator indicates that there is no downlink data to receive (Negative indication), the MSS adjusts the sleep window size (doubled by two times) according to the predetermined sleep window setting method and then enters the sleep mode again.

In this state, when data to be transmitted to the MSS arrives at the BS, the BS stores the data at a predetermined storage location and then the traffic indicator (MOB) during the next listening period L1. Informs that there is downlink data to the terminal through -TRF-IND (S23).

Accordingly, the MSS knows that there is data to receive through the traffic indicator received during the listening period L1 (Positive indication) (S28), and switches from the sleep mode to the normal operation mode and transmits from the base station. Receive the received data (S24).

In the mobile communication system, when an IP (Internet Protocol) packet (data) to be transmitted to the terminal arrives when the terminal is in a normal operation state, the router delivers the IP packet to the terminal through the base station. In the case of ND (Neighbor Discovery). In other words, when sending an IP packet, the router must find the destination link layer address (e.g., MAC address or Ethernet address) corresponding to the target network address (EX.IP address) using ARP or ND protocol. The ARP is an IPv4 protocol used when converting a network address into a link layer address (MAC address or Ethernet address), and the ND protocol is used to determine link-layer addresses of neighbors of a link to which it is connected. It is an IPv6 protocol. The address translation takes place only for the output IP packet since the IP translation and the link layer address (e.g., MAC address or Ethernet address) header are generated at the time of generation.

FIG. 5 shows the format of an ARP packet of IPv4, and FIGS. 6 and 7 are formats of a Neighbor Solicitation message and a Neighbor Advertisement message of IPv6.

8 is a diagram illustrating an example of an ARP request (IPv4) by a router when the terminal is in a normal operation state. As shown in FIG. 8, when an IP packet (data) to be transmitted to the terminal arrives, the router receives a link layer address (eg, MAC address or Ethernet address) corresponding to the destination network address (150.150.58.162). In order to obtain 28-00-38-A9), an ARP request is performed in case of IPv4 and a neighbor solicitation is performed in case of IPv6, and the base station (BS) listens to an ARP request or neighbor solicitation of a router and delivers them to terminals.

However, in the related art, it is not clearly defined how the base station (BS) should deliver the ARP request and neighbor solicitation to the terminals. That is, in the related art, when a terminal performs ARP (IPv4) or ND (IPv6) to deliver an IP packet (data) when the terminal is in a normal operation state, the operation of the base station for delivering it to the terminal is Since it is not clearly defined, there is a problem that IP packets (data) arriving at the router cannot be delivered to the terminal.

In addition, the terminal in the normal sleep / idle mode receives a signal only in a specific period. Therefore, even when the data to be delivered to the terminal arrives at the router and the base station can transmit the router's ARP request or neighbor solicitation to the terminal, the terminal cannot respond to the ARP request or neighbor solicitation in the sleep / idle mode. As a result, the terminal was unable to receive data.

9 is a diagram illustrating a problem in sleep mode with respect to IPv4. FIG. 9 is based on the premise that an ARP request is solved through a broadcast to terminals by an ARP request.

Referring to FIG. 9, when transmitting data (packets) to the terminal 10 currently in the sleep mode, the router transmits an ARP request to the base station BS, and the base station BS broadcasts the ARP request to the terminals. ) do. However, since the terminal 10 listens to the traffic indicator (MOB-TRF-IND) of the base station only for a certain period, the terminal 10 cannot hear the ARP request and cannot send a response. Thus, packets cannot arrive from the router to the base station. Also, IPv6 using Neighbor Discovery Protocol instead of ARP has the same problem in sleep mode.

10 is a diagram illustrating an IPv4 problem in idle mode. FIG. 10 is based on the premise that the ARP request is solved through a broadcast to a UE by an ARP request.

Referring to FIG. 10, when transmitting data (packets) to a terminal currently in idle mode 20, a router transmits an ARP request to a base station (BS), and the base station broadcasts the ARP request to the terminals. . However, since the terminal 20 also listens to the call message (MOB-PAG-ADV) of the base station only for a certain period, it cannot hear the ARP request and cannot send a response thereto. Thus, packets cannot arrive from the router to the base station. In addition, IPv6 using Neighbor Discovery Protocol instead of ARP has the same problem as IPv4 in idle mode.

Therefore, in the prior art, since the data cannot reach the base station when the terminal is in the idle mode or the sleep mode for power saving, the data cannot be transferred from the router to the terminal through the base station.

Accordingly, an object of the present invention is to define an operation of a base station for delivering an address request message (ARP or ND) to a terminal when the router transmits an IP packet (data) when the terminal is in a normal operation state.

Another object of the present invention is to provide a method for effectively transferring data from a router to a terminal through a base station when the terminal is in an idle mode or a sleep mode.

In order to achieve the above object, the base station stores information about the network address of all the terminals registered through the initial access process in the base station. Information about the network address of the terminal is, firstly, how the terminal registered with the base station notifies the base station, second, how the base station requests the terminal registered with the base station, and third, the base station knows through the message monitoring of the terminal and the router There is a way. Through this procedure, the router transmits an ARP request or a Neighbor Solictation to the base station on behalf of the terminal through the network address of the terminal obtained by the base station and the link layer address obtained by the base station during registration of the terminal. Do it.

In order to achieve the above object, in a mobile communication system in which a router transmits an address request message (ARP request or neighbor solicitation) to a base station in order to deliver downlink data to a terminal in a normal reception mode, the base station is connected to a router. The transmitted address request message is broadcast to a plurality of terminals, or one-to-one transmission is performed to all terminals connected to the base station, and a response message (ARP response or neighbor advertisement) received from the plurality of terminals is transmitted to the router.

Preferably, the response message is delivered to the base station via a second management connection or a generic data burst.

Preferably, among the plurality of terminals receiving the address request message, the terminal whose destination network address is its own address transmits a response message including its link layer address to the base station.

In order to achieve the above object, in a mobile communication system in which a router transmits an address request message to a base station in order to deliver downlink data to a terminal to be in a sleep / idle mode, the base station uses a target network address to link the terminal. When the address request message for retrieving the hierarchical address is transmitted from the router, a response message is transmitted to the router on behalf of the terminal.

Preferably, the base station is provided with network address information from the terminal in advance when the terminal transitions to the sleep mode / idle mode.

Preferably, the base station responds to the address request message by using the network address of the terminal provided through a predetermined message when the terminal enters the sleep / idle mode.

Preferably, the network address of the terminal is transmitted through a sleep request message or a cancellation request message when entering the sleep / idle mode by the request of the terminal. In addition, the network address of the terminal is transmitted through the terminal information message when entering the sleep / idle mode by the request of the base station.

Preferably, the base station broadcasts the response message for the Gratuitous ARP to the neighboring router using the network address of the terminal provided through the predetermined message in the sleep / idle mode. Broadcasting is done at such a frequency that the router's ARP cache can be maintained.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The present invention defines an operation that a base station must perform to deliver a downlink packet from a router to a terminal when the mobile / fixed terminal (hereinafter referred to as a terminal) is in a normal reception mode. In addition, the present invention proposes a method for supporting a smooth data transfer by the base station in response to the ARP request of the router on behalf of the terminal when the terminal transitions to the sleep mode / idle mode.

To this end, the present invention defines the following message.

-Sleep Request (MOB-SLP-REQ) Message: This message is a message that the UE requests to sleep to the base station to enter the sleep mode. As shown in FIG. 11, the MOB-SLP-REQ message is used by the base station for the ARP request (in case of IPv4) or Neighbor Solicitation (in case of IPv6) transmitted from the router after the sleep mode transition. It further includes a part for indicating the network address of the terminal in order to respond.

-DREG-REQ message: This message is a message for requesting the terminal to cancel registration with the base station in order to enter idle mode. The registration request (DREG-REQ) message, as shown in Figure 12, for the ARP request (for IPv4) or Neighbor Solicitation (for IPv6) transmitted from the router after the idle mode transition, the base station on behalf of the terminal In addition, the TLV tuple part that informs the network address of the terminal is further included.

In addition, when the registration request code (De-Registration_Request_Code) of the terminal is 0x01, the network address must be included in the TLV.

MOB-INFO message: This message informs the base station of the network address of the terminal when the terminal enters the sleep mode and the idle mode by the base station. An example of the terminal information message is illustrated in FIG. 13, and other forms are possible if the network address can be informed to the base station.

Hereinafter, the operation of the base station in the normal reception mode and the idle / sleep mode of the terminal for IP packet transmission in the mobile communication system according to the present invention.

When the terminal is in the normal reception mode, the router finds the link layer address (eg, MAC address or Ethernet address) of the terminal using the IP destination address so that the IP packet (data) can be delivered to the terminal through the router and the base station. For this, the router transmits an address request message to the base station, that is, an ARP request in case of IPv4 and a neighbor solicitation in case of IPv6.

Accordingly, in the present invention, when the base station receives an address request message from the router, the base station broadcasts it to a plurality of terminals or transmits 1: 1 to all terminals, and transmits a response message received from the terminals, that is, an ARP response or neighbor advertisement to the router. do. The terminal having its MAC address (or Ethernet address-link layer address) among the terminals receiving the address request message transmits the response message to the base station through a second management connection or a general data burst. do.

In addition, the present invention is a mobile station so that the base station can transmit a false (Proxy) ARP response (or neighbor advertisement) of the terminal in the sleep / dormant mode to the router the sleep request message (MOB-SLP-REQ) or registration request message ( DREG-REQ) includes its network address and transmits it to the base station. In addition, when the terminal enters the idle / sleep mode by the command of the base station, the terminal informs the base station of its network address information before entering the idle / sleep mode. Although the present invention has been described using IPv4 as an example, the case of IPv6 is also the same when using the ND (Neighbor Discovery) protocol instead of ARP.

FIG. 14 is a diagram illustrating a method in which a router obtains a link layer address of a target network address for data transmission when a terminal is in a normal reception mode according to a first embodiment of the present invention. In this case, IPv6 is the same as IPv4 when it is replaced with Neighbor advertisement instead of ARP request and Neighbor advertisement instead of ARP response.

As shown in FIG. 14, when data (IP packet) to be delivered to the terminal arrives, the router checks the ARP table and links layer address (eg, MAC address) corresponding to the target network address (150.150.58.162). Or Ethernet address). As a result of the check, if there is no link layer address (e.g., MAC address or Ethernet address) corresponding to the target network address in the table (blank), the router transmits an ARP request to the base station BS.

The base station (BS) receiving the ARP request broadcasts the ARP request to all terminals, and among the terminals receiving the ARP request, the terminal whose destination network address is its own address is its link layer address (08-00). -28-00-38-A9) to transmit an ARP response (Reply) to the base station (BS), the base station (BS) transmits the ARP response to the router. In this case, the terminal may perform an ARP response through a second management connection or a general data burst.

Therefore, the router obtains the MAC address (08-00-28-00-38-A9) corresponding to the target network address (150.150.58.162) from the ARP response and then transfers the data to the terminal using the MAC address (08-00-28-00-38-A9).

In the second embodiment of the present invention, the base station uses a false ARP or false ND protocol method to transmit data to the base station when the terminal operates in the sleep / idle mode. That is, in the first embodiment of the present invention, the base station transmits the ARP and neighbor discovery-related messages to the terminal, but in the second embodiment of the present invention, the base station transmits the network address and the link layer address (MAC address or Ethernet address) of the terminal. If so, the base station sends a response directly to the router's ARP request or neighbor solicitation. To this end, the base station may know the network address and the link layer address of the terminal through the process of registering the sleep or idle mode with the terminal, or may be obtained by monitoring the network address setting of the terminal. In addition, the base station can be obtained by making a request directly to the terminal. Below. The operation and data transmission of the base station according to the second embodiment of the present invention will be described in detail according to the operation mode of the terminal.

FIG. 15 is a diagram illustrating a method in which a router obtains a link layer address (e.g., a MAC address or an Ethernet address) of a target network address for an IP packet (data) to be delivered to the terminal when the terminal enters the sleep mode.

As shown in FIG. 15, the terminal MSS transmits a message requesting sleep (MOB-SLP-REQ) to the base station BS to enter the sleep mode (S30), and the base station transmits to the sleep request of the terminal. In response to the response message (MOB-SLP-RSP) is transmitted (S31). At this time, the terminal informs the base station of its network address so that the base station can make an ARP response instead of the ARP request of the router in the future.

Accordingly, the terminal enters the sleep mode during the sleep period included in the MOB-SLP-RSP and listens for the traffic indicator (MOB-TRF-IND) transmitted from the base station during the listening period L1 to determine whether there is downlink data to be received. Check (S32). If the traffic indicator indicates that there is no downlink data, the terminal increases the sleep window by a predetermined length (2 * N1) and then enters the sleep mode again.

On the other hand, when the data (IP packet) to be delivered to the terminal arrives, the router sends an ARP request to the base station to find out the MAC address corresponding to the network address of the data (S33), the base station for the ARP request of the router An ARP response is made instead of the terminal (S34).

When a false ARP response is received from the base station, the router transfers data to the base station (S35), and the base station stores the data and then traffics during the listening period (L1) of the terminal that there is data to be transmitted in downlink. Informs the terminal through the indicator (MOB-TRF-IND) (S36).

Therefore, the terminal knows that there is downlink data to be received through the traffic indicator delivered to the base station during the listening period (L1), after switching from the sleep mode to the normal operation mode and receives the data transmitted from the base station (S37).

FIG. 16 is a diagram illustrating a method in which a router acquires a link layer address of a target network address for data transmission when the base station enters a sleep mode.

The embodiment shown in FIG. 16 is basically the same as the embodiment shown in FIG. 15, but the embodiment shown in FIG. 16 enters the sleep mode at the request of the base station, so that the terminal informs the base station of the network address. It became.

FIG. 17 illustrates a method in which a router acquires a link layer address of a target network address for data transmission when the terminal enters an idle mode.

Referring to FIG. 17, the MSS transmits a message DREG-REQ requesting deregistration to the BS to enter idle mode, and the base station transmits a deregistration response command DREG- to the deregistration request. CMD) is transmitted (S40). At this time, the terminal informs the base station of its network address through the DREG-REQ so that the base station can perform the ARP response instead of the ARP request of the router in the future.

The base station (host base station) that the terminal has performed the deregistration procedure informs all base stations (BS # 2, BS33) in the same call area that the terminal has transitioned to the idle mode (S41) and calls the base station (BS # 1). Each base station receiving the notification registers the MAC address of the terminal in a paging list.

Then, when the data (IP packet) to be delivered to the terminal arrives, the router transmits an ARP request (Requst) to the host base station (MS # 1) to find the MAC address corresponding to the target network address of the data (S42). In step S43, the base station BS # 1 responds to the ARP request of the router instead of the terminal.

When the ARP response is received from the base station BS # 1, the router forwards the data to the base station, and the base station BS # 1 stores the transmitted data and then the other base stations BS # 2 and BS # 3 in the same calling area. Informs that the data to be delivered to the terminal has arrived (S44).

Accordingly, each of the base stations BS # 2 and BS # 3 which has received paging announce from the base station BS # 1 calls the terminal having the corresponding MAC address during the base station call period (S45).

If the action code of the call message transmitted from the base station BS # 3 is set to 10 indicating an initial network entry, the terminal accesses the base station BS # 3. In order to perform a ranging procedure and an initial network access procedure (S46 and S47), the base station BS # 3 transmits data to a terminal connected to the network (S48).

18 is a diagram illustrating a method in which a router acquires a link layer address of a target network address for data transmission when the base station enters an idle mode.

The embodiment shown in FIG. 18 is the same as the embodiment shown in FIG. 17 except for the step of informing the base station of the network address (MOB-INFO) since the terminal enters the idle mode by the request of the base station.

19 is an exemplary view showing the overall operation of the present invention for the sleep mode.

Referring to FIG. 19, when an IP packet to be transmitted to the terminal arrives, the router transmits an ARP request to the base station BS, and the base station BS transmits the terminal when the terminal transitions to the sleep mode. Using a quasi-network address, a fake ARP reply for the ARP request is transmitted to the base station (BS) on behalf of the terminal.

Once the ARP response is received, the router forwards the IP packet to the base station, and the base station stores the forwarded packet (data) and then there is data to be transmitted downlink through the MOB-TRF-IND message during the listening period of the terminal. Tells. After receiving the MOB-TRF-IND message, the terminal switches to the normal reception mode after the listening cycle ends and receives data transmitted from the base station.

20 is an exemplary view showing the overall operation of the present invention for the idle mode.

As shown in FIG. 20, when an IP packet to be transmitted to the terminal arrives, the router transmits an ARP request, and the base station (host base station) has made a request for termination of registration in order for the terminal to transition to idle mode. BS1 transmits a proxy ARP Reply to an ARP request on behalf of the terminal to the router using the network address transmitted when the terminal transitions to the idle mode.

When the ARP response is received, the router forwards the packet to the base station, and the base station stores the forwarded packet (data) and then sends downlink data to be sent to a specific terminal (MAC address) to all base stations in the same calling area. Announce that there is. Accordingly, the base stations (eg BS2) in the calling area broadcast the call message (MOB-PAG-ADV) to the corresponding terminal in the call broadcasting cycle, and the terminal having the corresponding MAC address among the terminals that listened to the message is networked. After performing the access procedure, it receives the data transmitted from the router.

As described above, the present invention provides a method for transmitting an ARP request (IPv4) or a neighbor solicitation (IPv6) of a router for transmitting data to the terminal when the terminal is in the normal reception mode by providing a method of transmitting the base station to the terminals. It can effectively deliver link IP packets.

According to the present invention, when the terminal enters the sleep / idle mode, the terminal informs the base station of its own network address, and the base station transmits the data to the ARP request or neighbor solicitation of the router to transmit the data when the packet (data) arrives at the router. On the contrary, instead of the terminal, an ARP response (IPv4) or neighbor advertisement (IPv6) including the network address of the terminal is transmitted to the router. Therefore, the present invention has the effect that the data can be effectively transmitted from the router to the mobile / fixed terminal through the base station when the terminal is in the idle mode or sleep mode for power saving.

In addition, although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a view showing the format of a conventional DREG-REQ message.

2 is a diagram illustrating a format of a conventional sleep request message (MOB-SLP-REQ).

3 is a diagram illustrating an example in which a terminal, which has entered an idle mode at the request of a terminal, generates data to be received downward and switches to a normal mode;

4 is a diagram illustrating an example in which a terminal, which has entered a sleep mode at the request of a terminal, generates data to be received downward and is switched to a normal mode;

5 is a diagram illustrating a format of a conventional ARP packet of IPv4.

6 is a diagram illustrating the format of a neighbor solicitation message in IPv6.

7 is a diagram illustrating a format of a neighbor advertisement message of IPv6.

8 illustrates an example of an ARP request (IPv4) by a router when the terminal is in a normal operation state.

FIG. 9 illustrates IPv4 problem in conventional sleep mode when a router transmits downlink data. FIG.

FIG. 10 is a diagram illustrating a problem with respect to IPv4 in the conventional idle mode when the router transmits downlink data. FIG.

11 illustrates a format of a sleep request (MOB-SLP-REQ) message according to the present invention.

12 illustrates the format of a DREG-REQ message in accordance with the present invention.

13 is a diagram illustrating an example of a message for notifying a base station of a network address of a terminal when the terminal enters a sleep / idle mode by the base station;

14 is a diagram illustrating a method in which a router obtains a link layer address of a target network address for data to be transmitted to a terminal when the terminal is in a normal reception mode according to the present invention.

FIG. 15 is a diagram illustrating a method in which a router acquires a link layer address of a target network address for data to be transmitted to a terminal when the terminal enters a sleep mode according to the present invention.

FIG. 16 is a diagram illustrating a method in which a router acquires a link layer address of a target network address for data to be transmitted to a terminal when the base station enters a sleep mode according to the present invention.

FIG. 17 illustrates a method in which a router obtains a link layer address of a target network address for data to be transmitted to a terminal when the terminal enters an idle mode according to the present invention.

18 is a diagram illustrating a method in which a router acquires a link layer address of a target network address for data to be transmitted to a terminal when the base station enters an idle mode according to the present invention.

19 is an exemplary view showing the overall operation of the present invention for the sleep mode.

20 is an exemplary view showing the overall operation of the present invention for the idle mode.

******* Explanation of symbols for the main parts of the drawing ********

10: terminal in the sleep state 20: terminal in the idle state

Claims (24)

In the mobile communication system for transmitting a predetermined address request message to the base station so that the router can determine the link layer address of the terminal using the destination network address in order to deliver the downlink data to the terminal in the normal reception mode, The base station broadcasts an address request message transmitted from a router to a plurality of terminals, and receives a response message from the plurality of terminals and transmits the response message to the router. The method of claim 1, wherein the address request message is IPv4 is an ARP request, and IPv6 is a Neighbor Solicitation. The method of claim 1, wherein the response message Information delivery method of a mobile communication system, characterized in that the ARP response or neighbor advertisement. The method of claim 1, wherein the response message The information transmission method of the mobile communication system, characterized in that delivered to the base station via a second management connection or a general data burst. The information of the mobile communication system according to claim 1, wherein, among the plurality of terminals receiving the address request message, a terminal whose destination network address is its own address transmits a response message including a link layer address to the base station. Delivery method. Transmitting, by a router, an address request message to a base station to find out a link layer address of a terminal corresponding to a target network address; Transmitting, by the base station, an address request message to all terminals, receiving a response message from the terminals, and delivering the response message to the router; And obtaining, by the router, a link layer address of the terminal from the response message, and transmitting the data to the terminal. The method of claim 6, wherein the address request message is ARP request or Neighbor Solicitation, wherein the response message is transmitted to the base station via a second management connection or a general data burst. The method of claim 6, wherein the link layer address of the terminal Information transmission method of a mobile communication system comprising a MAC address or an Ethernet address. The method of claim 6, wherein the terminal corresponding to the destination network address among the terminals receiving the address request message transmits a response message including a link layer address to the base station. A mobile communication system in which a router transmits a predetermined address request message to a base station in order to deliver downlink data to a terminal to be in a sleep / idle mode. When the address request message for determining the link layer address of the terminal using the destination network address is received from the router, the base station transmits a response message for the address request message directly to the router on behalf of the terminal. Information delivery method. 11. The method of claim 10, wherein the address request message is IPv4 is an ARP request, and IPv6 is a Neighbor Solicitation. The method of claim 10, wherein the response message Information delivery method of a mobile communication system, characterized in that the ARP response or neighbor advertisement. The method of claim 10, wherein the base station Information transmission method of a mobile communication system, characterized in that the terminal receives a network address when the terminal transitions to the sleep mode / idle mode. The method of claim 10, wherein the response message And a link layer address of the terminal corresponding to the network address of the terminal. 15. The method of claim 14, wherein the link layer address of the terminal Information transmission method of a mobile communication system comprising a MAC address or an Ethernet address. The method of claim 10, wherein the base station And transmitting the response message to the router by using the network address of the terminal provided through the predetermined message when the terminal enters the sleep / idle mode. 17. The method of claim 16 wherein the predetermined message is The information transmission method of the mobile communication system, characterized in that when entering the sleep / idle mode at the request of the terminal is a sleep request message or registration request message. 17. The method of claim 16 wherein the predetermined message is The information transmission method of the mobile communication system, characterized in that when entering the sleep / idle mode at the request of the base station terminal information message. In a mobile communication system in which a router transmits an address request message to a base station for delivering downlink data to a terminal in a sleep / idle mode, When the terminal enters the sleep / idle mode, informs the base station of its network address through a predetermined message; When the data arrives, the router transmitting an address request message to the base station to determine a link layer address corresponding to the network address of the terminal; Transmitting, by a base station, a response message for the address request message to a router on behalf of the terminal; Obtaining a link layer address of the terminal from the response message, and transmitting downlink data from the router to the terminal. 20. The method of claim 19, wherein the address request message is IPv4 is an ARP request, and IPv6 is a Neighbor Solicitation. 20. The method of claim 19, wherein the network address of the terminal is When entering the sleep / idle mode by the request of the terminal information delivery method of the mobile communication system, characterized in that it is delivered through a sleep request message or a registration request message. 20. The method of claim 19, wherein the network address of the terminal is When the mobile station enters the sleep / idle mode at the request of the base station. 20. The system of claim 19, wherein the base station is An information transmission method of a mobile communication system, comprising transmitting a response message to a router using a network address. 20. The method of claim 19, wherein the link layer address of the terminal is Information transmission method of a mobile communication system comprising a MAC address or an Ethernet address.