KR100633102B1 - Wireless network terminal device for merging packets of connections in one-session and method thereof - Google Patents

Abstract

A wireless network terminal device forming a wireless network environment is disclosed. The present wireless network terminal device includes a transmission buffer for storing a first packet to be transmitted to the outside, and a second packet to be transmitted through the same session as the first packet among packets stored in the transmission buffer. And a control unit for merging two packets, and a communication module for transmitting the merged packets. When the header compression function is provided, a header compression module for compressing header portions of the first packet and the second packet may be further included. As a result, packet collisions between the wireless network terminal apparatuses in the same wireless network environment are reduced, thereby increasing the wireless transmission rate.

Wireless networks, packets, merges, sessions

Description

Wireless network terminal device for merging and transmitting a packet using a single session and a method of transmitting the same {Wireless network terminal device for merging packets of connections in one-session and method

1 is a schematic diagram showing a general wireless network environment,

2 is a schematic diagram illustrating a process of transmitting a packet to an access point in a conventional wireless network terminal device;

3 is a block diagram showing the configuration of a wireless network terminal apparatus according to the present invention;

4 is a schematic diagram showing a process of merging and transmitting packets to an access point in a wireless network terminal device according to the present invention;

5 is a flowchart illustrating a packet transmission method in a wireless network terminal device according to the present invention.

The present invention relates to a wireless network terminal device, and more particularly, to a wireless network terminal device and a packet transmission method capable of increasing packet transmission efficiency by merging and transmitting a packet transmitted through a single session.

With the development of the Internet and mobile communication technology, the present society is able to receive various multimedia services regardless of time and space, which is causing a great change in the user's life environment. In particular, recently, as portable electronic devices such as notebook PCs and PDAs are gradually spread, efforts to implement data communication based on the Internet through wireless networks as well as wired networks are increasing.

In particular, when building a wired LAN (Local Area Network) in a crowded place such as a department store or a factory, there is a high risk of breakage of the wired lines, and it may become messy. If you build a wireless LAN, or even a building-to-building connection, you can create a clean and comfortable environment.

Hardware to build a wireless LAN must use technology that handles data transmission as well as radio frequencies. To this end, the IEEE (Institute of Electrical and Electronic Engineers) has recently ratified the international standard IEEE802.11b to define all aspects of wireless LAN data transmission. IEEE802.11b is a standard for wireless LAN that can provide speeds up to 11Mbps in the ISM band of 2.4Hz. It defines the physical layer and the medium access control (MAC) layer. It occupies almost 100% of the wireless LAN environment.

On the other hand, the wireless LAN has an Ad-Hoc mode and an infrastructure mode using an access point that can communicate using only a wireless LAN card.

Ad hoc mode is suitable for handling data between terminals. That is, the data transmitted from the wireless LAN card installed in the terminal device can be directly transmitted and received to the wireless LAN card of the other terminal device. Therefore, only wireless LAN card can be used for efficient data sharing as well as printers and peripherals.

Infra mode communicates data with a wireless LAN card through a repeater called an access point. If the access point is installed in the open field of view, stable data communication is possible even if there are obstacles around the PC transmitting and receiving data.

In addition, it is possible to interconnect with wired LAN through HUB, and if several Access Points are installed at regular intervals, roaming function between Access Points can be used for network connection while moving. It is common to build a wireless LAN environment using.

An access point that constitutes the infrastructure mode refers to a device that performs a role of a base station in a wireless LAN network that satisfies the IEEE802.11b standard. A wireless LAN card is installed in a desktop PC or a notebook PC to provide data through an access point. Means a device for transmitting and receiving.

1 illustrates a typical wireless network environment constructed using an access point. According to Figure 1, each wireless network terminal device (MT1 to MTn) is equipped with a wireless LAN card through which the connection to the access point (AP) and the session to transmit and receive data. In this case, since each wireless network terminal device must transmit and receive data through the same access point (AP), a collision avoidance method called a distributed coordination function (DCF) is adopted so that data collision does not occur. DCF waits for a random time longer than a certain length before sending data. If the other wireless network terminal device is not communicating at the end of the waiting time, it transmits data. If the other terminal starts communication during the waiting time, it waits until the communication ends and transmits the data.

FIG. 2 illustrates a process of simultaneously transmitting and receiving an AP and voice data, video data, and general data in two wireless network terminals MTa and MTb. As shown in FIG. 2, the current wireless network terminal device is increasingly multimedia, such as supporting a video chat function, and thus, a plurality of terminal devices simultaneously receive data of various sizes. In this case, since the data rate is different for each data, if the data is transmitted to the same access point (AP), the overall data rate of the data is reduced due to the characteristics of the IEEE802.11b DCF that compete without a separate priority.

That is, as shown in FIG. 2, when MTa and MTb transmit image data 10 and 30 ', general data 20 and 20', and voice data 30 and 10 'to the access point AP, respectively, MTa. The video data 10 and the audio data 30 transmitted from the collide with the audio data 10 'and the video data 30' transmitted from the MTb, respectively. In this case, the DCF method waits without transmitting data during the waiting time, and when a multimedia service is provided in which each data should be transmitted in a single session, a problem arises in that the overall transmission speed decreases. This problem appears as a problem of deterioration of the high speed service when the low speed service and the high speed service are simultaneously supported. On the other hand, as the number of wireless network terminal devices increases in the same environment, more problems are generated because more connections are generated on the radio and the number of collisions increases.

The present invention has been made to solve the problems described above, an object of the present invention is to provide a wireless network terminal device and data using the same by improving the quality of multimedia services by merging and transmitting packets to be transmitted in a single session The present invention provides a transmission method.

The wireless network terminal apparatus according to the present invention, if there is a transmission buffer for storing the first packet to be transmitted to the outside, and a second packet to be transmitted through the same session (s) as the first packet among the packets stored in the transmission buffer, The wireless network environment may be configured by including a control unit for merging the first packet and the second packet and a communication module for transmitting the merged packet.

Preferably, the wireless network environment may be an infrastructure mode wireless LAN environment in which the wireless network terminal device is connected to a correspondent node through an access point.

Preferably, if the present wireless network terminal apparatus has a header compression function, the wireless network terminal apparatus checks header portions of the first packet and the second packet to be merged and compresses common information. A header compression module may be further included.

The header compression module may compress the header by checking a header context of each packet to be merged and then deleting data to be transmitted in common. In this case, since the size of the entire packet is reduced, the number of collisions between data is reduced, thereby increasing the transmission rate.

More preferably, when a predetermined third packet is received from the access point, the controller may determine whether the third packet is merged and, if merged, separate and process each packet.

On the other hand, the data communication method according to the invention, (a) storing the first packet to be transmitted to the outside, (b) determining whether there is a second packet to be transmitted through the same session as the first packet And (c) merging the first packet and the second packet and transmitting if the second packet exists.

In this case, when the wireless network terminal apparatus has a header compression function, the step (c) preferably further includes the step of identifying and compressing header portions of the first packet and the second packet, respectively. Do.

On the other hand, more preferably, receiving a predetermined third packet from an external access point, and confirms whether or not merge, and if it is determined that the third packet is a merged packet, the step of separating and processing each packet further It may include.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing the configuration of a wireless network terminal apparatus according to the present invention. According to FIG. 3, the wireless network terminal device includes a storage unit 110, a transmission buffer 120, a control unit 130, a communication module 140, and a header compression module 150.

The storage unit (or socket buffer 110) stores data to be transmitted. That is, the processed data of the IP layer is stored once in the storage unit 110, the controller 140 refers to the header portion of each stored data and transmits to the corresponding destination node. In this case, when the wireless network terminal device supports the multimedia function, each data may be processed in a different socket layer and recorded in at least one storage unit 110 for each characteristic. For example, in order to perform a video chat, image data including the user's appearance, voice data containing the user's voice, and general data containing the user's message should be simultaneously transmitted. Since the speed is different, the data may be recorded in a separate storage 110 suitable for each characteristic and then transmitted under the control of the controller 130.

The controller 140 checks the header portion of the data stored in the storage 110 and checks whether there is a packet transmitted through the same session. In this case, the destination node ID, the session ID, the RTP time stamp, and the like recorded in the header portion of each packet may be checked to determine whether the packet is to be transmitted through the same session.

RTP (Real-time Transport Protocol) is a communication protocol of transport layer for transmitting and receiving voice and video in real time. Unlike RSVP (resource reservation protocol), RTP (Real-time Transport Protocol) is executed between terminals without relying on communication network devices such as routers. Is characteristic. RTP is usually used as a higher communication protocol of UDP (user datagram protocol). Since each packet is stamped with an RTP time-stamp, the packets can be played in time synchronized. The reception side checks transmission delay, bandwidth, and the like, and notifies the upper layer application on the transmission side using the RTP control protocol (RTC) to realize QoS (Quality of Service) control by adjusting the encoding speed.

If the RTP timestamps are similar and there are many packets that are expected to be transmitted to the same node, the controller 140 merges them and transmits them to the access point. In this case, it is possible to confirm whether similar packets are recorded for a predetermined waiting time. To this end, the wireless network terminal apparatus may further include a separate transmission buffer (not shown) to store packets that need to be merged in the transmission buffer, and then search for another similar packet for a predetermined time.

When the plurality of packets are merged, the controller 140 controls the communication module 150 to transmit the packet to the access point. The communication module 150 performs a function of directly transmitting and receiving data with an external access point.

Meanwhile, when the header compression function is provided, the wireless network terminal device may further include a separate header compression module 150. The header compression module 150 checks a header context including an IP address and a UDP port number. In other words, if there is a variety of data transmitted through a single session has a header context corresponding to each data, the header part is compressed by deleting the common context. In addition to the IP address and the UDP port number, the header context may include an IP-ID, an RTP sequence number, an RTP timestamp, and the like.

For example, voice data with a transmission rate of 8K, general data with a transmission rate of 64K, and image data with a transmission rate of 384K all have the same IP-ID, and the upper RTP is associated with each other. Since the RTP header of one packet is obtained, the RTP header of another synchronized packet can be obtained. In this case, in the case of IPv4, a header of size 40 + 40 + 40 = 120 bytes can be reduced to size 40 + 4 (bit representing a port number) + 4 = 48 bytes.

On the other hand, if it is determined that there are a plurality of packets to be transmitted to the same wireless network terminal device through the same session, the external access point merges and transmits each packet. In this case, when the control unit 130 receives the merged packet in this manner from the outside, the controller 130 may check the port number and separate each packet. That is, since each multimedia packet is processed in a different IP layer, it has a different transport layer port number, so that the packets can be identified by checking the bits representing the port numbers. Prior to merging packets, the access point must buffer through time delays that occur while traversing the network to reach the access point. Accordingly, the wireless network terminal apparatus does not need to synchronize the packets separately merged, so that the buffer required for synchronization is reduced.

On the other hand, according to Figure 4, each wireless network terminal device (MTa and MTb) shows a process of transmitting the merged packet. In this case, when the MTa first transmits the merged packets 10, 20, and 30, the MTb checks whether the MTa transmission is completed for a predetermined waiting time, and then also the merged packets 10 ', 20', and 30 '. Can be transmitted. As a result, the problem of deterioration of the high-speed data service generated when the data transmitted at high speed and the data transmitted at low speed are mutually eliminated.

5 is a flowchart illustrating a method of merging and transmitting packets in the wireless network terminal apparatus. According to FIG. 5, the processing of the IP layer is finished, and the first packet stored in the storage unit (ie, the socket buffer 110) is checked by the controller 130 and recorded in the transmission buffer 120 (S510).

The controller 130 checks whether there is a second packet to be transmitted through the same session as the first packet among other packets recorded in the transmission buffer 120 (S520). If it is determined that there is a multimedia packet (that is, a second packet) to be transmitted through the same session as the first packet, the first packet and the second packet are merged (S530).

In this case, it is checked whether all packets to be transmitted in the same session are received in the storage 110 while waiting for a predetermined waiting time (S540). If such a packet is received during that latency, the received packet is also merged with the first packet and the second packet.

Finally, the merged packet is wirelessly transmitted to the access point (AP) using the communication module 140 (S550).

On the other hand, if the present wireless network terminal device has a header compression function, that is, further includes a header compression module 150, the step of compressing the header of each packet to be merged first before merging the packets to be added. do.

In addition, if the merged packet is received from the access point, the controller 130 may check the header portion of the received packet, separate each packet, and transmit the same to the upper layer for processing.

As described above, the wireless network terminal apparatus according to the present invention merges and transmits packets when there are a plurality of packets to be transmitted through the same session, and similarly processes each packet separately when the merged packets are received. Accordingly, when forming the same wireless network, the number of packets is reduced, and the IFS (interframe space) required for transmitting each packet can be removed, so that transmission competition with other wireless network terminal apparatuses can be eliminated. As a result, the probability of packet collision is reduced, resulting in an improvement in radio rate.

On the other hand, since each wireless network terminal apparatus does not need a buffer for synchronizing the received packets, there is an extra effect that the manufacturing price is reduced as a result.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (9)

In the wireless network terminal device constituting a wireless network environment, A storage unit which stores a plurality of multimedia packets; A controller which checks respective header information among the multimedia packets stored in the storage unit, and searches for multimedia packets to be transmitted to the same destination node through the same session; A transmission buffer for storing the multimedia packet searched by the controller for a predetermined waiting time; And, And a communication module configured to transmit the multimedia packet stored in the transmission buffer to the destination node. The controller performs the search during the waiting time, and when the search is completed, merges the multimedia packets stored in the transmission buffer, and then controls the communication module to transmit the merged multimedia packet to the destination node. Wireless network terminal device. The method of claim 1, And a header compression module for compressing header portions of packets stored in the transmission buffer. The header compression module And checking common header contexts of the packets stored in the transmission buffer, and deleting common parts. The method of claim 1, And the merged multimedia packet includes a header and a body of each multimedia packet. The method according to claim 1 or 2, The wireless network environment, the wireless network terminal device, characterized in that the infrastructure mode (Infrastructure Mode) wireless LAN environment in which the wireless network terminal device is connected to the other node through an access point (Access Point). The method of claim 4, wherein The control unit, If a predetermined external packet is received from an external access point, the wireless network terminal apparatus checks the port number of the external packet to determine whether to merge, and if so, separates and processes each packet. In the data communication method in a wireless network terminal device constituting a wireless network environment, (a) storing a multimedia packet to be sent to a predetermined destination node in a buffer; (b) identifying each header information among the multimedia packets stored in the buffer, searching for multimedia packets to be transmitted to the same destination node through the same session, and storing the found multimedia packets in a transmission buffer for a predetermined waiting time; (c) performing the search during the waiting time and merging multimedia packets stored in the transmission buffer when the search is completed; And, (d) transmitting the merged multimedia packet to the destination node. The method of claim 6, Step (c) is, And identifying and compressing header portions of packets stored in the transmission buffer, respectively. The method according to claim 6 or 7, The wireless network environment is a data communication method, characterized in that the infrastructure mode (Infrastructure Mode) wireless LAN environment in which the wireless network terminal device is connected to the correspondent node through an access point (Access Point). The method of claim 8, Receiving a predetermined external packet from the access point, checking a port number of the external packet, and confirming merging; And If it is determined that the external packet is a merged packet, separating and processing each packet; Data communication method in a wireless network terminal device further comprising.

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