KR20130140965A - Method for controlling maximum segment size, and packet data gateway - Google Patents

Method for controlling maximum segment size, and packet data gateway Download PDF

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Publication number
KR20130140965A
KR20130140965A KR1020120055014A KR20120055014A KR20130140965A KR 20130140965 A KR20130140965 A KR 20130140965A KR 1020120055014 A KR1020120055014 A KR 1020120055014A KR 20120055014 A KR20120055014 A KR 20120055014A KR 20130140965 A KR20130140965 A KR 20130140965A
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KR
South Korea
Prior art keywords
size
segment size
maximum
maximum segment
transmission unit
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KR1020120055014A
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Korean (ko)
Inventor
노재훈
백기진
지영하
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주식회사 케이티
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Priority to KR1020120055014A priority Critical patent/KR20130140965A/en
Publication of KR20130140965A publication Critical patent/KR20130140965A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/36—Flow control; Congestion control by determining packet size, e.g. maximum transfer unit [MTU]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures

Abstract

A method of controlling a maximum segment size of a packet used for packet transmission between a mobile terminal and a content server by a packet data gateway, the method comprising: storing a maximum transmission unit size that a serving gateway can process a packet; Receiving a first maximum segment size delivered to a content server, determining whether to change the first maximum segment size based on the maximum transmission unit size, and as a result of the determination, when the first maximum segment size is changed, Transmitting a second maximum segment size to the content server instead of the first maximum segment size, and changing the third maximum segment size delivered by the content server to the mobile terminal to the second maximum segment size; And transmitting to the second maximum segment size. Is a value less than each of the first maximum segment size and the third maximum segment size.

Description

How to control the maximum segment size, and the packet data gateway that does it {METHOD FOR CONTROLLING MAXIMUM SEGMENT SIZE, AND PACKET DATA GATEWAY}

The present invention relates to a maximum segment size control method and a packet data gateway for performing the same.

The mobile terminal uses a service through a default bearer and a dedicated bearer generated by an initial attach procedure and a dedicated bearer activation procedure.

The mobile terminal establishes a Transmission Control Protocol (TCP) session with the content server to use a service corresponding to each bearer. At this time, the mobile terminal and the content server negotiate the maximum segment size (MSS) to determine the maximum transmission unit (MTU) size. When the packet data gateway receives the downlink packet from the content server, the packet data gateway transmits an MTU in which the user datagram protocol (UDP) and the GPRS tunneling protocol (GTP) header is added to the serving gateway.

If the packet transmitted by the packet data gateway is larger than the MTU size that can be handled by the serving gateway, a packet drop occurs due to the packet drop. To avoid this, when the packet data gateway divides the packet and retransmits it, the network transmission performance may be reduced due to the header overhead.

The problem to be solved by the present invention is to control the maximum segment size (MSS) of the packet transmitted between the mobile terminal and the content server, based on the maximum transmission unit (MTU) size that the serving gateway can handle It is to provide a maximum segment size control method and a packet data gateway that performs the same.

A method of controlling a maximum segment size of a packet used for packet transmission between a mobile terminal and a content server by a packet data gateway according to an embodiment of the present invention, the serving gateway may store a maximum transmission unit size that can process a packet. And receiving, by the mobile terminal, a first maximum segment size delivered to the content server, determining whether to change the first maximum segment size based on the maximum transmission unit size, and as a result of the determination, the first In case of changing the maximum segment size, transmitting a second maximum segment size to the content server instead of the first maximum segment size, and transmitting a third maximum segment size transmitted by the content server to the mobile terminal. Changing the segment size and transmitting the segment size to the mobile terminal; The second maximum segment size is a value smaller than each of the first maximum segment size and the third maximum segment size.

The storing of the maximum transmission unit size may store the maximum transmission unit size received from the serving gateway when generating a default bearer of the mobile terminal.

The storing of the maximum transmission unit size may be performed by mapping the default bearer and the maximum transmission unit size.

Receiving the first maximum segment size may receive the first maximum segment size from the mobile terminal when establishing a TCP session between the mobile terminal and the content server.

Determining whether to change the first maximum segment size comprises calculating a packet size when a packet generated with the first maximum segment size is delivered to the serving gateway using the added header size, and the calculated packet size is If the size is larger than the maximum transmission unit size, the first maximum segment size may be changed.

The transmitting of the second maximum segment size to the content server may transmit the second maximum segment size determined based on the maximum transmission unit size to the content server.

The changing of the second maximum segment size to the mobile terminal may include transmitting the second maximum segment size to the mobile terminal such that packet transmission between the mobile terminal and the content server is performed at the second maximum segment size. Can transmit

A method of controlling a maximum segment size of a packet used for packet transmission between a mobile terminal and a content server by a packet data gateway according to another embodiment of the present invention, the default bearer for communication between the mobile terminal and a first content server Setting a value, storing a first maximum transmission unit size used by the serving gateway for the default bearer, receiving a request for setting up a dedicated bearer for communication with a second content server from the mobile terminal, and the serving gateway Sending a message indicating the first maximum transmission unit size to the mobile station; receiving a response from the serving gateway whether to use the first maximum transmission unit size for the dedicated bearer; and The dedicated bear based on the included maximum transmission unit size information Determining the final maximum segment size of the packet transmitted on the router.

Receiving the response includes receiving the response indicating that the first maximum transmission unit size is used for the dedicated bearer, and determining the maximum segment size is based on the first maximum transmission unit size. The maximum segment size can be determined.

Receiving the response includes receiving the response indicating that the dedicated bearer uses a second maximum transmission unit size that is different from the first maximum transmission unit size, and determining the maximum segment size comprises the second maximum. The final maximum segment size may be determined based on the transmission unit size.

The receiving of the response may map and store the size of the second maximum transmission unit and the dedicated bearer.

The determining of the maximum segment size may determine the final maximum segment size so that the packet size delivered to the serving gateway is not greater than the second maximum transmission unit size.

The method may further include changing each maximum segment size exchanged by the mobile terminal and the second content server to the final maximum segment size when establishing a TCP session between the mobile terminal and the second content server. The method may further include delivering to each of the second content servers.

A packet data gateway controlling a maximum segment size according to another embodiment of the present invention, comprising: a bearer setting unit configured to set at least one bearer for a service of a mobile terminal, and a maximum transmission unit corresponding to a bearer from a serving gateway when setting up a bearer A maximum transmission unit management unit for receiving a size and managing a maximum transmission unit size for each bearer, and intervening in a TCP session setting between the mobile terminal and at least one content server based on the maximum transmission unit size for each bearer, for each bearer And a maximum segment size control unit for determining a maximum segment size so as not to exceed the maximum transmission unit size set in FIG.

The maximum segment size control unit changes the maximum segment size exchanged between the mobile terminal and the content server to the determined maximum segment size when a TCP session is established between the mobile terminal and the content server. Can be delivered to each server.

The maximum segment size control unit receives a first maximum segment size transmitted from the mobile terminal to the content server through a random bearer and based on the maximum transmission unit size of the arbitrary bearer stored in the maximum transmission unit management unit. After determining whether to change the maximum segment size, the first maximum segment size is changed to a second maximum segment size and transmitted to the content server, and the third maximum segment size transmitted from the content server to the mobile terminal is changed to the second. The maximum segment size may be changed and transmitted to the mobile terminal.

According to an embodiment of the present invention, packet loss due to a packet exceeding a maximum transmission unit (MTU) size at a serving gateway may be reduced, and network transmission performance may be improved. In addition, according to an embodiment of the present invention, a service may be provided by controlling a maximum segment size (MSS) for each bearer to match a service characteristic corresponding to each bearer.

1 is a schematic view of a mobile communication system according to an embodiment of the present invention.
2 is a diagram illustrating a transport packet structure according to an embodiment of the present invention.
3 is a flowchart of a method of controlling a maximum segment size for a default bearer according to an embodiment of the present invention.
4 is a flowchart of a method of controlling a maximum segment size for a dedicated bearer according to another embodiment of the present invention.
5 is a block diagram of a packet data gateway according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated.

In this specification, a mobile terminal (MT) is a mobile station (MS), a subscriber station (Subscriber Station (SS)), a mobile subscriber station (Portable Subscriber Station (PSS), a user equipment (UE), user access, etc. The terminal may also be referred to as an access terminal (AT) or the like, and may include all or a part of functions such as a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, and an access terminal.

In this specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B, an evolved NodeB (eNodeB) A base station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may perform all or a part of functions of an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, .

Now with reference to the drawings will be described in the mobility management apparatus and load control method thereof according to an embodiment of the present invention.

1 is a schematic view of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 1, the mobile communication system 10 includes a mobile station (Mobile Station, User Equipment) 100, and a communication network 200. The communication network 200 may be a mobile communication network evolved from a third generation mobile communication network or a third generation mobile communication network such as Wideband Code Division Multiple Access (WCDMA) / Global System for Mobile Communications (GSM). The communication network 200 will be described taking an LTE network including Long Term Evolution (LTE) or LTE advanced as an example.

The mobile terminal 100 connects to the communication network 200. The mobile terminal 100 may access the content servers 300 and 400 through the communication network 200 and use a packet-based data service provided by the content servers 300 and 400.

The communication network 200 includes a base station (eNodeB, Base Station) 210, a mobility management entity (MME) 230, a serving gateway (S-GW) 250, and a packet data gateway. Network Gateway, PDN-GW) 270. Here, the base station 210 corresponds to an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The mobility management device 230, the serving gateway 250, and the packet data gateway 270 correspond to an Evolved Packet Core (EPC).

The base station 210 is a wireless access device to which the mobile terminal 100 connects and performs a wireless sequence function.

The mobility management device 230 manages mobility of the mobile terminal 100 by performing paging, location registration, authentication, and the like. In addition, the mobility management device 230 is responsible for signal control between the base station 210 and the serving gateway 250, and forms an interface with another mobile communication network.

The serving gateway 250 is responsible for the mobility anchor (mobility anchor) function for the movement between the base station 210, or the mobile terminal between the mobile communication network.

The packet data gateway 270 allocates an IP (Internet Protocol) address of the mobile terminal 100 and performs a packet data related function of the core network. The packet data gateway 270 is responsible for a mobility anchor function for mobile station movement between the communication network 200 and a non-3GPP network. The packet data gateway 270 receives the downlink packet received from the content server 300/400 and transmits it to the serving gateway 250, and transmits the uplink packet received from the serving gateway 250 to the content server 300/400. To send).

Packets transmitted between the mobile terminal 100 and the content server 300/400 pass through the base station 210, the serving gateway 250, and the packet data gateway 270. In this case, the base station 210 and the serving gateway 250 may be connected by an S1 GRS (GPRS Tunneling Protocol) tunnel, and the serving gateway 250 and the packet data gateway 270 may be connected by an S5 GTP tunnel.

2 is a diagram illustrating a transport packet structure according to an embodiment of the present invention.

Referring to FIG. 2, the mobile terminal 100 and the content server 300 establish a TCP session through 3-way hand shaking for packet transmission. In this case, each of the mobile terminal 100 and the content server 300/400 exchanges its maximum segment size (MSS) calculated based on its maximum transmission unit (MTU) size. The mobile terminal 100 and the content server 300/400 generate a payload with the maximum segment size (MSS) found through 3-way hand shaking and transmit the payload to the counterpart. Here, the maximum segment size (MSS) is a size of an area where actual data is carried, and the maximum transmission unit (MTU) is a packet in which various header areas are added to the maximum segment size (MSS).

The mobile terminal 100 transmits the payload 500 of the maximum segment size (MSS) to the base station 210 and attaches the TCP header 510 and the IP header 520.

The base station 210 and the serving gateway 250, the serving gateway 250 and the base station 210 are connected by a GTP tunnel, and use the UDP-based GTP-U protocol. Accordingly, the base station 210 attaches the GTP header 530, the UDP header 540, and the IP header 550 to the serving gateway 250. The serving gateway 250 modifies the GTP header 530 and the UDP header 540 of the received packet and transmits the same to the packet data gateway 270.

The packet data gateway 270 removes the GTP header 530 and the UDP header 540 of the received packet, and transmits the packet to the content server 300/400.

The downlink packet transmitted by the content server 300 arrives at the mobile terminal 100 through the reverse process. In this case, the content server 300 generates a payload based on the maximum segment size (MSS) exchanged while establishing a TCP session with the mobile terminal 100.

As such, the mobile terminal 100 and the content server 300 generate a payload with a size determined by the maximum segment size (MSS) exchange and transmit the payload to the counterpart. In this case, the mobile terminal 100 and the content server 300 consider the sizes of the TCP header 510 and the IP header 520 when exchanging the maximum segment size (MSS). However, the packet is actually added to the GTP header 530, UDP header 540, IP header 550 in addition to the TCP header 510 and the IP header 520 through the communication network 200. That is, when the mobile terminal 100 and the content server 300 exchange their own maximum segment size (MSS) considering only the TCP header 510 and the IP header 520 when establishing a TCP session, the communication network 200 The additional headers substantially increase the maximum transmission unit (MTU) size. As a result, the packet may exceed the maximum transmission unit (MTU) size that the serving gateway 250 can handle.

Next, when the mobile terminal 100 and the content server 300 establish a TCP session, the packet data gateway 270 controls the maximum segment size (MSS) through the TCP session setup in detail.

3 is a flowchart of a method of controlling a maximum segment size for a default bearer according to an embodiment of the present invention.

Referring to FIG. 3, when the mobile terminal 100 accesses the communication network 200, a default bearer is generated from the mobile terminal 100 to the packet data gateway 270 through an initial attach procedure. . Here, it will be described that the mobile terminal 100 performs an initial attach procedure in order to use a service provided by the content server 300.

The mobile terminal 100 transmits an access request message to the mobility management device 230 (S310).

The mobility management device 230 transmits a create session request message to the serving gateway 250 (S320). The session creation request message may include information such as QoS Class Identifier (QCI), Maximum Bit Rate (MBR), Allocation and Retention Priority (ARP), and the like.

The serving gateway 250 transmits a create session request message including a maximum transmission unit (MTU) size to the packet data gateway 270 (S322).

The packet data gateway 270 sets the maximum transmission unit (MTU) size of the serving gateway 250 to the maximum transmission unit (MTU) size of the default bearer (S330).

The packet data gateway 270 transmits a create session response message including a set maximum transmission unit (MTU) size to the serving gateway 250 (S340).

The serving gateway 250 transmits a create session response message to the mobility management device 230 (S342).

The mobility management device 230 transmits an access accept message to the mobile terminal 100 (S350).

The mobile terminal 100 transmits a TCP session establishment message (TCP SYN) including its maximum segment size (MSS = A) to the packet data gateway 270 (S360).

The packet data gateway 270 determines whether to change the maximum segment size (MSS) of the mobile terminal 100 based on the maximum transmission unit (MTU) size of the default bearer (S370). That is, when the packet generated by the maximum segment size (MSS = A) of the mobile terminal 100 is attached to various headers and is delivered to the serving gateway 250, the packet data gateway 270 transmits the size of the packet to the serving gateway ( It is determined whether to exceed the maximum transmission unit (MTU) size of 250). In this case, the packet data gateway 270 changes the maximum segment size (MSS = A) if the maximum transmission unit (MTU) size of the default bearer, that is, the maximum transmission unit (MTU) size of the serving gateway 250 is sufficiently large. I never do that. That is, the packet data gateway 270 does not interfere with the TCP session establishment.

When changing the maximum segment size (MSS = A) of the mobile terminal 100, the packet data gateway 270 determines the maximum segment size (MSS = B) based on the maximum transmission unit (MTU) size of the default bearer. (S372).

The TCP session establishment message (TCP SYN) changed to the maximum segment size (MSS = B) having determined the maximum segment size (MSS = A) of the mobile terminal 100 is transmitted to the content server 300 (S374).

The content server 300 transmits a TCP session establishment message (TCP SYN) including its maximum segment size (MSS = C) to the packet data gateway 270 (S380).

The packet data gateway 270 changes the maximum segment size MSS = C of the content server 300 to the maximum segment size MSS = B, and transmits the same to the mobile terminal 100 (S382). Here, the packet data gateway 270 determines the maximum segment size (MSS = B) determined by the maximum segment size (MSS) of the content server 300 in order to establish a TCP session with the maximum segment size (MSS = B) determined by the packet data gateway 270. I send it as). However, if the maximum segment size MSS = C of the content server 300 is smaller than the determined maximum segment size MSS = B, the packet data gateway 270 may determine the maximum segment size (MSS) of the content server 300. MSS = C) is passed as is.

The mobile terminal 100 transmits an ACK message to the content server 300 (S390). When the TCP session setup is completed, the mobile terminal 100 and the content server 300 generate and transmit a packet with the maximum segment size (MSS = B) determined by the packet data gateway 270.

4 is a flowchart of a method of controlling a maximum segment size for a dedicated bearer according to another embodiment of the present invention.

Referring to FIG. 4, when the mobile terminal 100 accesses the communication network 200, a default bearer is generated from the mobile terminal 100 to the packet data gateway 270 through an initial attach procedure. . In addition, the mobile terminal 100 may add a bearer to use a plurality of services. The additionally created bearer is called a dedicated bearer. Herein, it will be described that the mobile terminal 100 uses a service provided by the content server 400 through a dedicated bearer.

The mobile terminal 100 transmits a resource request message for creating a dedicated bearer to the mobility management device 230 (S410).

The mobility management device 230 transmits a bearer resource command message to the serving gateway 250 (S420).

The serving gateway 250 transmits a bearer resource command message to the packet data gateway 270 (S422).

The packet data gateway 270 transmits a create session request message including a maximum transmission unit (MTU) size of the default bearer to the serving gateway 250 (S430). That is, the packet data gateway 270 transmits a message indicating the maximum transmission unit (MTU) size of the default bearer to the serving gateway 250. Here, the maximum transmission unit (MTU) size of the default bearer is the maximum transmission unit (MTU) size used by the serving gateway 250 when setting the default bearer, and is a value stored in the packet data gateway 270 when setting the default bearer.

The serving gateway 250 transmits a create session request message to the mobility management device 230 (S432).

The mobility management device 230 transmits a create session response message to the serving gateway 250 (S440).

The serving gateway 250 transmits a create session response message to the packet data gateway 270 (S442). The session creation response message includes whether to use the default bearer's maximum transmission unit (MTU) size for the dedicated bearer. That is, the serving gateway 250 may determine the new maximum transmission unit (MTU) size allocated for the dedicated bearer when the maximum transmission unit (MTU) size allocated for the dedicated bearer is different from the maximum transmission unit (MTU) size of the default bearer. To the packet data gateway 270. In this case, the packet data gateway 270 stores the received maximum transmission unit (MTU) size corresponding to the dedicated bearer, instead of the maximum transmission unit (MTU) size of the default bearer. Alternatively, the serving gateway 250 may inform the packet data gateway 270 that the maximum transmission unit (MTU) size for the default bearer is also used for the dedicated bearer.

The packet data gateway 270 stores the maximum transmission unit (MTU) size corresponding to the dedicated bearer based on the create session response message received from the serving gateway 250 (S450). The maximum transmission unit (MTU) size corresponding to the dedicated bearer may be the same size as the default bearer, or may be another size.

The mobile terminal 100 transmits a TCP session establishment message (TCP SYN) including its maximum segment size (MSS = A) to the packet data gateway 270 (S460).

The packet data gateway 270 determines whether to change the maximum segment size MSS of the mobile terminal 100 based on the maximum transmission unit (MTU) size of the dedicated bearer (S470).

When changing the maximum segment size (MSS = A) of the mobile terminal 100, the packet data gateway 270 determines the maximum segment size (MSS = B) based on the maximum transmission unit (MTU) size of the dedicated bearer. (S472).

The TCP session establishment message (TCP SYN) changed to the maximum segment size (MSS = B) having determined the maximum segment size (MSS = A) of the mobile terminal 100 is transmitted to the content server 400 (S474).

The content server 300 transmits a TCP session establishment message (TCP SYN) including its maximum segment size (MSS = C) to the packet data gateway 270 (S480).

The packet data gateway 270 changes the maximum segment size (MSS = C) of the content server 400 to the determined maximum segment size (MSS = B) and transmits the same to the mobile terminal 100 (S482). Here, the packet data gateway 270 determines the maximum segment size (MSS = B) determined by the maximum segment size (MSS) of the content server 400 in order to establish a TCP session with the maximum segment size (MSS = B) determined by the packet data gateway 270. I send it as). However, if the maximum segment size MSS = C of the content server 400 is larger than the determined maximum segment size MSS = B, the packet data gateway 270 may determine the maximum segment size (MSS) of the content server 400. MSS = C) is passed as is.

The mobile terminal 100 transmits an ACK message to the content server 300 (S490). When the TCP session setup is completed, the mobile terminal 100 and the content server 300 generate and transmit a packet with the maximum segment size (MSS = B) determined by the packet data gateway 270.

5 is a block diagram of a packet data gateway according to an embodiment of the present invention.

Referring to FIG. 5, the packet data gateway 270 includes a bearer setting unit 271, a maximum transmission unit (MTU) manager 273, and a maximum segment size (MSS) controller 275 to determine the maximum segment size. . The packet data gateway 270 includes a packet data processor 277 for processing packet data of the communication network 200.

The bearer setting unit 271 sets up a bearer for the service of the mobile terminal 100. The bearer includes a default bearer and a dedicated bearer.

The maximum transmission unit (MTU) management unit 273 manages the maximum transmission unit (MTU) received from the serving gateway 250 at the time of bearer setup. In this case, the serving gateway 250 may process the packet in a maximum transmission unit (MTU) having a different value for each bearer. Accordingly, the maximum transmission unit (MTU) manager 273 may map and manage the maximum transmission unit (MTU) for each bearer of the mobile terminal 100. For example, the maximum transmission unit (MTU) management unit 273 maps the size of the maximum transmission unit (MTU) of the first value to the default bearer of the mobile terminal 100, and the second value to the dedicated bearer such as VoIP. The size of the maximum transmission unit (MTU) can be mapped.

The maximum segment size (MSS) controller 275 determines the maximum segment size (MSS) through the TCP session establishment between the mobile terminal 100 and the content server 300/400. The maximum segment size (MSS) controller 275 determines whether to change the maximum segment size (MSS) of the mobile terminal 100 based on the size of the maximum transmission unit (MTU) stored in the maximum transmission unit (MTU) manager 273. do. That is, as described above, when the maximum segment size (MSS) control unit 275 uses the maximum segment size (MSS) of the mobile terminal 100 or the content server 300/400, the maximum transmission of the serving gateway 250 is performed. It is determined whether the unit (MTU) size is exceeded. The packet data gateway 270 does not change the maximum segment size (MSS) if the maximum transmission unit (MTU) size set for the bearer is large enough. If the maximum data segment size (MSS) needs to be changed, the packet data gateway 270 determines the maximum segment size (MSS) based on the maximum transmission unit (MTU) size set in the bearer. The maximum segment size (MSS) control unit 275 transfers the determined maximum segment size (MSS) to the TCP session establishment message, thereby negotiating with the maximum segment size (MSS) determined by the mobile terminal 100 and the content server 300/400. Control as possible.

The packet data processor 277 performs a packet data related function of the communication network 200. The packet data processing unit 277 receives the downlink packet received from the content server 300/400 through the bearer set by the bearer setting unit 271, transmits the downlink packet to the serving gateway 250, and the serving gateway 250. The uplink packet received from the server is transmitted to the content server 300/400.

As described above, the packet data gateway 270 determines the maximum segment size. However, the maximum segment size determination method may be implemented in a separate device.

According to an embodiment of the present invention, packet loss due to a packet exceeding a maximum transmission unit (MTU) size may be reduced, and network transmission performance may be improved. In addition, according to an embodiment of the present invention, a service may be provided by controlling a maximum segment size (MSS) for each bearer to match a service characteristic corresponding to each bearer.

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (16)

A method of controlling a maximum segment size of a packet used for packet transmission between a mobile terminal and a content server by a packet data gateway,
Storing, by the serving gateway, the maximum transmission unit size that a packet can process;
Receiving a first maximum segment size delivered by the mobile terminal to the content server;
Determining whether to change the first maximum segment size based on the maximum transmission unit size;
If it is determined that the first maximum segment size is changed, transmitting a second maximum segment size to the content server instead of the first maximum segment size; and
Changing the third maximum segment size transmitted by the content server to the mobile terminal to the second maximum segment size and transmitting the changed size to the second maximum segment size;
Lt; / RTI >
And the second maximum segment size is a value smaller than each of the first maximum segment size and the third maximum segment size. In claim 1,
The step of storing the maximum transmission unit size
The maximum segment size control method of storing the maximum transmission unit size received from the serving gateway when creating a default bearer of the mobile terminal. 3. The method of claim 2,
The step of storing the maximum transmission unit size
The maximum segment size control method of mapping and storing the default bearer and the maximum transmission unit size. In claim 1,
Receiving the first maximum segment size
And receiving the first maximum segment size from the mobile terminal when establishing a TCP session between the mobile terminal and the content server. In claim 1,
Determining whether to change the first maximum segment size is
Calculate the packet size when the packet generated with the first maximum segment size is delivered to the serving gateway using the added header size, and if the calculated packet size is larger than the maximum transmission unit size, the first maximum segment size How to control the maximum segment size to change. In claim 1,
The step of transmitting the second maximum segment size to the content server
And transmitting the second maximum segment size determined based on the maximum transmission unit size to the content server. In claim 1,
Changing to the second maximum segment size and transmitting to the mobile terminal
And transmitting the second maximum segment size to the mobile terminal such that packet transmission between the mobile terminal and the content server is performed at the second maximum segment size. A method of controlling a maximum segment size of a packet used for packet transmission between a mobile terminal and a content server by a packet data gateway,
Setting a default bearer for communication between the mobile terminal and a first content server;
Storing a first maximum transmission unit size that a serving gateway uses for the default bearer,
Receiving a request for setting up a dedicated bearer for communication with a second content server from the mobile terminal,
Transmitting a message indicating the first maximum transmission unit size to the serving gateway;
Receiving a response from the serving gateway including whether to use the first maximum transmission unit size for the dedicated bearer; and
Determining a final maximum segment size of a packet transmitted through the dedicated bearer based on the maximum transmission unit size information included in the response
Maximum segment size control method comprising a. 9. The method of claim 8,
Receiving the response
Receive the response indicating that the first maximum transmission unit size is used for the dedicated bearer,
The determining of the maximum segment size
And determining the final maximum segment size based on the first maximum transmission unit size. 9. The method of claim 8,
Receiving the response
Receive the response indicating that a second maximum transmission unit size different from the first maximum transmission unit size is used for the dedicated bearer,
The determining of the maximum segment size
And determining the final maximum segment size based on the second maximum transmission unit size. 11. The method of claim 10,
Receiving the response
The maximum segment size control method of mapping and storing the size of the second maximum transmission unit and the dedicated bearer. 11. The method of claim 10,
The determining of the maximum segment size
And determining the final maximum segment size so that the packet size delivered to the serving gateway is not greater than the second maximum transmission unit size. The method of claim 12,
When establishing a TCP session between the mobile terminal and the second content server, each maximum segment size exchanged by the mobile terminal and the second content server is changed to the final maximum segment size, so that the mobile terminal and the second content are changed. Deliver to each server
Maximum segment size control method further comprising. A packet data gateway that controls the maximum segment size.
A bearer setting unit configured to set at least one bearer for a service of a mobile terminal,
A maximum transmission unit management unit for receiving a maximum transmission unit size corresponding to a bearer from a serving gateway when managing a bearer, and managing a maximum transmission unit size for each bearer; and
A maximum segment size control unit for determining a maximum segment size so as not to exceed a maximum transmission unit size set for each bearer by intervening in a TCP session between the mobile terminal and at least one content server based on the maximum transmission unit size for each bearer
Packet data gateway comprising a. The method of claim 14,
The maximum segment size control unit
When establishing a TCP session between the mobile terminal and the content server, a packet for changing the maximum segment size exchanged by the mobile terminal and the content server to the determined maximum segment size and delivering the packet to the mobile terminal and the content server, respectively. Data gateway. The method of claim 14,
The maximum segment size control unit
Receive a first maximum segment size transmitted from the mobile terminal to the content server through an arbitrary bearer, and change the first maximum segment size based on the maximum transmission unit size of the arbitrary bearer stored in the maximum transmission unit management unit. After the determination, the first maximum segment size is changed to the second maximum segment size and transmitted to the content server, and the third maximum segment size transferred from the content server to the mobile terminal is changed to the second maximum segment size. Packet data gateway for transmitting to the mobile terminal.
KR1020120055014A 2012-05-23 2012-05-23 Method for controlling maximum segment size, and packet data gateway KR20130140965A (en)

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