KR100983266B1 - Packet transmission method and system therefor - Google Patents

Abstract

The present invention relates to a communication system, and more particularly, to a packet transmission processing method and a system therefor in a next generation mobile communication system. The present invention provides a method for performing optimal transmission processing for packets having real-time and non-real-time characteristics. It provides a method and system, and also includes a method for performing a packet transmission process so that the data source can monitor the status information of the wired section and the status information of the wireless section, and a wire / wireless section discriminator therefor. Provide a system. In addition, when there are a plurality of terminals receiving a service such as a multimedia broadcast / multicast service (MBMS), a real-time transport protocol (RTP) packet and an RTP control protocol (RTCP: RTP) Control Protocol) Provides a method and system for realizing the resource control required for packet transmission without changing RTP and RTCP. In particular, the present invention provides a packet processing method for generating optimal status information for processing and flow control of packets in a wired section and a wireless section, and a wire / wireless section discriminating apparatus for realizing the packet processing method. Provides a way to determine whether to use it.

Wireless access bearer, wire / wireless separator

Description

Method of processing transmission of packet, and system for the same

1 is a diagram illustrating a structure of a general UMTS.

2 is a block diagram illustrating an example of a UMTS configuration for explaining real-time / non-real-time packet flows according to the present invention.

3 is a block diagram illustrating a protocol structure for explaining real-time / non-real-time packet flows according to the present invention.

4 is a flowchart illustrating a procedure for processing transmission of real-time / non-real-time packets according to the present invention.

The present invention relates to a communication system, and more particularly, to a method and a system for processing transmission of packets in a next generation mobile communication system.

UMTS (Universal Mobile Telecommunications System) is a next generation mobile communication system that evolved from the European standard Global System for Mobile Communications (GSM) system.                         

1 is a diagram illustrating a structure of a general UMTS.

Referring to FIG. 1, the UMTS includes a terminal 100, a Universal Mobile Telecommunications Network Terrestrial Radio Access Network (UTRAN) hereinafter, abbreviated as UTRAN 200, and a core network 300.

The UTRAN 200 is composed of a plurality of Radio Network Sub-systems (RNS) 10a to 10n.

Taking the configuration of the radio network subsystems 10a to 10n as an example, one radio network subsystem 10a may include one radio network controller (hereinafter abbreviated as RNC) 12 and a plurality of Node Bs. (11a-11b). The Node Bs 11a to 11b are managed by the RNC 12 here. Each wireless network subsystem 10a to 10n has the same configuration as the above example.

The RNC 12; 14 is responsible for allocating and managing radio resources.

The Node Bs 11a to 11b; 13a to 13b receive the uplink data transmitted from the terminal 100 or transmit the downlink data to the terminal 100.

The RNC 12; 14 serves as an access point for connecting the Node Bs 11a-11b; 13a-13b to the core network 300, and the Node Bs 11a-11b; 13a-13b are the terminal 100. It serves as an access point of the UTRAN 200 to.

In the above configuration, if the terminal 100 is connected to the network, the RNC managing the terminal 100 becomes a serving RNC. At this time, the serving RNC serves as an access point to the core network 300 for data transmission of the terminal 100. The serving RNC allocates a radio resource suitable for providing a specific service to the terminal 100.

The service provided to the terminal 100 through the above configuration may be divided into a circuit switched service and a packet switched service.

For example, a typical voice telephony service belongs to a circuit switched service and a web browsing service over an internet connection belongs to a packet switched service.

In the case of supporting the circuit switched service, the RNC 12; 14 is connected to a mobile switching center (MSC) 20 of the core network 300. MSC 20 is then connected to the Gateway Mobile Switching Center (GMSC) 30 that manages the connection of voice calls requested from the external network or requested to the external network.

In the case of supporting the packet switched service, the RNC 12; 14 is a Serving General Packet Radio Service (SGSN) Support Node (SGSN) 40 or a Gateway GPRS Support Node (GGSN) hereinafter. , GGSN) 50.

At this time, the GGSN 50 performs a function of a gateway for interworking with the Internet or an external network. In addition, the SGSN 40 is connected to the GGSN 50 to manage the mobility of the terminal, and performs a packet exchange function.

On the other hand, there is an interface (interface) between the plurality of network components that can exchange information for each other communication. The interface between the RNC 12; 14 and the core network 300 is defined as an lu interface. Where the Iu interface is connected with components in the packet switched area, it is called Iu-PS, and where the Iu interface is connected with the component in the circuit switched area, it is defined as Iu-CS.                         

UMTS having the configuration as shown in Figure 1 has been started for the purpose of providing a variety of multimedia services that guarantee a certain level of quality.

In general, the overall quality of a service that determines the user's satisfaction with a specific service is defined as Quality of Service (QoS).

The quality of service (QoS) that a user feels is determined by various and complex factors applied to each service.

The high transmission speed in the wireless section simply cannot satisfy the quality of service (QoS) required by the user. That is, the transmission capacity (or transmission rate) of a certain level or more in all transmission paths (paths including wired sections as well as wireless sections) between two end-to-ends communicating, as well as guaranteeing transmission rates in a wireless section. Should be guaranteed.

In UMTS, various bearer service concepts are defined and used to guarantee a certain level of quality of service (QoS) for a specific end-to-end service. More specifically, the end-to-end specific communication service is divided into a plurality of sections (eg, wired section, wireless section) through various network components, so that data transmission services in each section are independently defined and defined services. To ensure quality of service for each service.

In particular, a bearer that is responsible for the reliable transmission of user data in a section between the terminal and the core network is called a radio access bearer (RAB).

RAB is implemented through radio bearer service and lu bearer service. The radio bearer service is to perform data transmission through the Uu interface between the terminal and the RNC, and the Iu bearer service is to perform data transmission between the RNC and the core network.

In order to provide a specific service, the above-described RAB must be set first, and in setting the RAB, various parameters for satisfying a specific quality of service (QoS) are set. In the circuit-switched service, the MSC starts setting up the RAB. In the packet-switched service, the SGSN starts setting up the RAB.

In the 3GPP (3 ^rd generation partnership project) it is configured for the standardization of UMTS multimedia broadcast / multicast service; developing a standard specification for the (Multimedia Broadcast / Multicast Service hereinafter abbreviated, MBMS).

MBMS is to overcome the limitations of the existing Cell Broadcast Service (CBS) (unable to support the multicast function, the limitation of supportable media data, etc.).

Therefore, MBMS delivers multimedia data such as audio, picture, and video to multiple terminals at the same time using unidirectional point-to-multipoint bearer service.

MBMS is classified into a broadcast mode and a multicast mode.

The MBMS broadcast mode transmits multimedia data to all terminals in a broadcast area. In this case, the broadcast area refers to an area where a broadcast service is available.

The MBMS multicast mode transmits multimedia data only to certain specific terminal groups in the multicast area. Here, the multicast region refers to an area where multicast service is available. Therefore, in order to receive the MBMS in the multicast mode, the terminal must subscribe to a multicast subscription group to receive specific multicast data.

For the MBMS, information required to provide an MBMS must be set. Such request information of the MBMS is realized through the above-described setting of the RAB. That is, for the MBMS, the RAB of the MBMS must be set up to guarantee a certain level of quality of service (QoS) between the core network and the terminal.

On the other hand, MBMS uses a real-time transport protocol (hereinafter, referred to as RTP) to transmit real-time data. Herein, the data is data having a packet form transmitted in real time, and hereinafter, it is described as a real time packet.

RTP is a protocol designed to transmit multimedia data having real-time transmission characteristics such as audio and video over a multicast network or a unicast network.

The format of a transport packet defined by RTP includes an RTP media type field for representing an RTP media type. The RTP media type field is used to indicate the type of payload carried in the current RTP packet. That is, the terminal may know whether the received RTP packet is voice data or video data through the RTP media type information inserted in the RTP media type field of the received RTP packet.

However, RTP itself does not guarantee quality of service (QoS) for real-time services such as voice or video services. Therefore, the MBMS further uses an RTP control protocol (RTP).

Therefore, the effect is maximized by using the control protocol RTCP in the transmission of real-time packets.

RTCP monitors data transmission in multicast networks and provides minimal control and identification.

The main function of RTCP is to generate feedback information of status information for distributing data to the same component and elements of the same function in a multicast network. This relates to the flow control and congestion control of other protocols.

In more detail, feedback information according to RTCP may include status information of the RTP packet transmitted from the data source to the final destination (for example, information on the amount of loss of the RTP packet when the RTP packet is transmitted). Include. When the feedback information is generated and provided to the data source, the data source uses the state information included in the feedback information to determine the data size of the RTP packet to be transmitted later and / or an appropriate encoding scheme. The feedback information generated above is transmitted to the data source in the form of an RTCP packet. In other words, the RTCP packet is a transmission form of feedback information.

The data source also assumes that RTCP packets are sent from one terminal. Thus, the data source considers the number of RTCP packets received equal to the number of terminals that will receive the RTP packets. Accordingly, the data source determines each bandwidth required for the transmission of the RTP packet and the RTCP packet according to the number of RTCP packets, that is, the number of terminals.

RTP described above is a protocol defined in the data source, RTCP is a protocol defined in the terminal that is the final destination of the RTP packet.

However, since the RTP and the RTCP are protocols made for the wired section, there are the following problems in supporting the MBMS that provides the service via both the wireless section and the wired section shown in FIG. 1. That is, if RTP and RTCP are applied to the radio section as it is, the following problem occurs.

First, the RTCP packet for transmitting the state information of the RTP packet to the data source does not distinguish the amount of packet loss in the wired section and the wireless section. That is, since RTCP packet is used to monitor the current network situation by checking only the packet loss due to collision in the wired section, the data source can generate the packet loss amount in the wireless section. Make it wrong. Considering the situation of the UMTS network, since the packet loss amount is higher in the wireless period than the packet loss amount in the wired section, the data source performs the transmission process of the subsequent RTP packet based on the RTCP packet. There is a high probability of error.

For example, the data source monitors the current state of the network from the state information included in the RTCP packet, and changes the size and encoding scheme of the RTP packet to be transmitted according to the monitoring result. Thus, we want to reduce the loss of RTP packets to be transmitted later.

On the other hand, the cause of packet loss in the wired section and the packet loss in the wireless section are different. Therefore, the size and encoding scheme of the RTP packet to be transmitted should be appropriately changed according to each cause of the wired section and the wireless section.

However, in the related art, since there is no way for a data source to distinguish between a packet loss cause in a wired segment and a packet loss cause in a wireless segment, in a wired network and / or a wireless network to reduce an error in transmission for RTP packets. There was a problem that the transmission processing and control of the is not performed effectively.

Second, when there are a plurality of terminals receiving services such as MBMS, if each terminal transmits an RTCP packet to a data source, it may cause a problem in determining each bandwidth required for transmission of the RTP packet and the RTCP packet. Can be.

In more detail, since RTP and RTCP are protocols designed only for the wired section, only one terminal (or host) existed at the end of the wired section. Therefore, in point-to-multipoint communication such as MBMS, if the same use as in the prior art without modification of RTP and RTCP occurs, there is a problem in allocating bandwidth required for packet transmission, thereby reducing the efficiency of resource usage.

 SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a method and system for performing an optimal transmission process for packets having real-time and non-real-time characteristics.

It is still another object of the present invention to provide a method for performing packet transmission processing so that a data source can separately monitor status information of a wired section and status information of a wireless section, and a system including a wire / wireless section discriminator therefor. To provide.

Another object of the present invention is to transmit a Real-time Transport Protocol (RTP) packet and an RTP Control Protocol (RTCP) packet when there are a plurality of terminals receiving services such as MBMS. The present invention provides a method and system for realizing resource control without changing RTP and RTCP.

It is still another object of the present invention to provide a packet processing method for generating optimal state information for processing and flow control of a packet in a wired section and a wireless section, and for realizing the packet processing method. The present invention provides a method for determining whether to use a wired / wireless segmentation device.

The method of the present invention for achieving the above object, the core network to determine the characteristics of the packet to be transmitted from the data source, the step of notifying the characteristics of the determined packet to the end of the wired section, and And determining whether to use a wired / wireless segmentation device provided at an end, and transmitting a packet of the data source to an end of a wireless section via the end of the wired section.

In the system of the present invention, a packet transmission processing system including a terminal and a data source for providing a packet to the terminal, the wired / wireless section for distinguishing a wired section from a wireless section in packet transmission to the terminal. And a core network providing an indicator for turning on / off the wire / wireless zone separator according to the characteristics of the packet.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating an example of a UMTS configuration for explaining real-time / non-real-time packet flows according to the present invention, and FIG. 3 shows a protocol structure for explaining real-time / non-real-time packet flows according to the present invention. Block diagram. First, the flow of real time / non-real time packets will be described with reference to FIG. 2.

The data source 70 may transmit a packet of real time characteristics or a packet of non real time characteristics.

The core network 300 determines the characteristics of the packet to be transmitted from the data source 70 and informs the UTRAN 200 which is the end of the wired interval.

In more detail, when a radio access bearer for packet transmission is established between the core network 300 and the terminal 100, the SGSNs 40a to 40n of the core network 300 are packets to be transmitted from the data source 70. The UTRAN 70 is informed whether it has non-real time or real time properties.

In particular, when a packet to be transmitted from the data source 70 has a real time characteristic, the SGSNs 40a to 40n inform the UTRAN 200 whether to use RTCP for a packet having a real time characteristic.

In addition, the SGSN 40a to 40n informs the UTRAN 200 whether to use the wired / wireless segmentation device 80a to 80n when the radio access bearer is set.

In the present invention, as described above, the characteristics of the packet to which the SGSNs 40a to 40n of the core network 300 are transmitted, whether to use RTP / RTCP and whether to use the wired / wireless section separators 80a to 80n are determined by the UTRAN 200. Use directives to tell).

Once a packet is transmitted from the data source 70, the GGSNs 50a to 50n perform a function of a gateway and forward the corresponding packet to one SGSN 40a to 40n.

The SGSNs 40a to 40n determine an attribute of a packet to be delivered to the terminal 100 and transmit an indicator for informing the characteristic of the packet to the UTRAN 200. Of course, if the determined packet is in real time, the status information on the transmission of the real-time packet via the core network 300 to the data source 70 via the indicator whether or not to use RTCP further included in the indicator.

In addition, since the UTRAN 200 can grasp the characteristics of the packet and the presence or absence of the use of RTCP from the indicator received from the core network 300, it is determined based on the indicator received whether or not to use the wire / wireless section discriminator (80a ~ 80n) can do. However, whether to use the wired / wireless segmentation device 80a to 80n may be additionally included in the indicator and transmitted.

SGSNs 40a-40n forward real-time or non-real-time packets to RNCs 12a-12n of UTRAN 200.

At this time, the wired / wireless section separators 80a to 80n of the UTRAN 200 operate when the packet to be transmitted to the terminal 100 is a real time packet, whereas the non-real time packet does not operate. Of course, even in the case of real-time packets, if the RTCP is not used, the wire / wireless section separators 80a to 80n do not operate.

As an example, when the RTP packet is transmitted from the data source 70 to the terminal 100 which is the final destination, the present invention provides an amount of loss of the RTP packet transmitted through the UTRAN 200 located between the wired section and the wireless section. In order for the data source 70 to monitor the status of the network, such as transmission delay, for each section, the wired / wireless section separators 80a to 80n receive an RTCP packet including status information up to the end of the wired section. Forward to 70. In particular, in the present invention, the RTCP packet transmitted to the data source 70 does not include the status information of the wireless section, and the RTCP packet (the RTCP packet transmitted from the terminal) including the status information of the wireless section is transmitted from the UTRAN 200. Process.

Hereinafter, the wire / wireless segmentation apparatus 80a to 80n according to the present invention will be described in more detail.

The wired / wireless segmentation apparatus 80a to 80n of the present invention includes a wireless section between the UTRAN 200 and the terminal 100, a real time packet such as an RTP packet, the UTRAN 200 and a data source ( It is to ensure the operation of the independent RTP / RTCP of each section for the wired section between 70).

The wired / wireless section separators 80a to 80n of the present invention are used in a system for transmitting an RTP packet and an RTCP packet, such as MBMS, to generate and transmit an RTCP packet including state information of a wired section, and also to a wireless section. Transmits the RTP packet to the terminal 100 located in the and receives and processes the RTCP packet including the state information of the wireless section from the terminal 100.

These wired / wireless section separators 80a to 80n are provided in the UTRAN 200 performing transmission control of a wireless section.

In particular, the wired / wireless section separators 80a to 80n are connected to the RNCs 12a to 12n of the UTRAN 200. When implementing the system, the wired / wireless section separators 80a to 80n may be mounted inside the RNCs 12a to 12n and may be mounted independently of the RNCs 12a to 12n in the UTRAN 200. If the wired / wireless section separators 80a to 80n operate in connection with the RNCs 12a to 12n, the connection uses tunneling. That is, the wired / wireless section separators 80a to 80n are connected to the RNC 12a to 12n by tunneling to control the flow and processing of packets in the wired / wireless section.

If the wired / wireless section separators 80a to 80n are used as one component of the UTRAN 200 as described above, as shown in FIG. 3, in order to ensure efficient operation of the RTCP in each section, Protocol layers in which the wireless section separators 80a to 80n perform execution are further defined. That is, the RTP / RTCP, User Datagram Protocol (UDP) layer and Internet Protocol (IP) layer corresponding to the functions of the wired / wireless section separators 80a to 80n are UTRAN ( 200 is further configured on each of the radio protocol and the network access protocol.

On the other hand, the wire / wireless section separator 80a ~ 80n may be implemented as a device independent of the RNC (12).

The operation of the wired / wireless zone separators 80a to 80n will be described in more detail. When the wired / wireless zone separators 80a to 80n receive a real time packet such as an RTP packet transmitted from the data source 70, In addition, an RTCP packet including state information on the wired interval is generated. The generated RTCP packet is then provided to the data source 70. At this time, the data source 70 regards each of the RTCP packets transmitted from the wired / wireless section separators 80a to 80n as being transmitted for each wired / wireless section endpoint, and each bandwidth required for the transmission of the RTP packet and the RTCP packet. Determine the Bandwidth.

In addition, the wire / wireless section separators 80a to 80n broadcast and / or multicast a RTP packet to a plurality of terminals 100 through a downlink radio channel, and receive the RTP packet. Receive the RTCP packet generated from the) to obtain the state information on the current radio interval.

Then, transmission processing for the wireless section is performed from the obtained state information of the wireless section.

At this time, the transmission process for the RTP packet is directly performed by the wired / wireless section separators 80a to 80n or by other components of the UTRAN 200 (particularly, the RNC). When other components of the UTRAN 200 (particularly, the RNC) perform the transmission process for the RTP packet, the wire / wireless section separator 80a to 80n of the radio section obtained from the RTCP packet of the terminal 100 Provides status information to the corresponding component for performing the transfer process. As a result, the subject performing the transmission process from the state information of the wired section and the subject performing the transmission process from the state information of the wireless section are independent.

As another example, in the present invention, the wire / wireless segmentation apparatus 80a to 80n further includes the state information of the wireless segment obtained from the RTCP packet of the terminal 100 in the RTCP packet provided to the data source 70. You can also provide

On the other hand, the packet transmitted from the data source 70 to the terminal 100 is transmitted not only packets of real time characteristics but also packets of non real time characteristics. However, the wired / wireless section separators 80a to 80n perform transmission processing only on data having real-time characteristics such as RTP packets.

Accordingly, the core network 300 determines a characteristic of a packet to be transmitted from the data source 70, and uses a specific indicator to operate the wired / wireless segmentation apparatus 80a to 80n only when the determined packet characteristic is real time. do.

As described above, the use of the indicator in the present invention is that the use of the wired / wireless segmentation apparatus 80a to 80n for the processing of real-time packet transmission in a system in which real-time packets and non-real-time packets are transmitted has a problem in the transmission of non-real-time packets. This is to prevent it.

In addition, in the present invention, the use of the indicator to ensure that the use of the wire / wireless section separators 80a to 80n does not interfere with the transmission of real-time packets that do not require RTCP packets.

The core network 300 determines whether the characteristics of the packet to be transmitted from the current data source 70 are real time or non real time. The UTRAN 200, which is the end of the wired interval, is notified when the radio access bearer (RAB) is configured for packet transmission with the terminal.

In the present invention, an indicator for indicating the characteristics of the packet is transmitted to the UTRAN (200) in the following case.

First, when the wired / wireless section separators 80a to 80n operate on / off in response to a command by the indicator of the core network 300, the core network 300 is connected to the data source 70. When a packet of any characteristic is to be transmitted, an indicator indicating the characteristic of the packet to be transmitted is transmitted to the UTRAN 200. Indicators used for this purpose are classified into indicators representing real-time characteristics and indicators representing non-real-time characteristics. Therefore, when the real-time packet is received after the indicator for notifying the packet transmission of the real-time characteristic is received from the core network 300, the wired / wireless segmentation device 80a to 80n records the state information on the wired interval for the real-time packet. The source 70 is informed. However, when the indicator for notifying the packet transmission of the non-real time characteristic is received from the core network 300, the wire / wireless segmentation apparatus 80a to 80n does not participate in the non-real time packet transmission at all.

Second, when the wired / wireless section separators 80a to 80n are turned off in response to a command by the indicator of the core network 300, the core network 300 is a packet of any characteristic from the data source 70. When the transmission is to be transmitted, the indicator is transmitted to the UTRAN 200 only when the characteristic of the packet to be transmitted is non-real time and when the packet to be transmitted is a real time packet but does not require status information in the wired interval. Therefore, when the wired / wireless section separators 80a to 80n receive an indicator indicating a packet transmission of a non-real time characteristic from the core network 300 or an indicator indicating that it does not require status information in a wired section, the non-real time packet transmission is performed. However, it is off without any involvement in real-time packet transmission.

Third, when the MBMS is supported, and the wired / wireless section separators 80a to 80n determine whether to use the RTCP packet according to an instruction by the indicator of the core network 300, the core network 300 may include a data source ( When sending an arbitrary RTP packet from 70), the indicator is sent to the UTRAN 200 only when the RTCP packet is used. Therefore, when the wired / wireless segmentation apparatus 80a to 80n receives an indicator from the core network 300, the RTCP packet including the state information of the wired segment for the RTP packet is provided to the data source 70, and the RTCP packet is It does not participate in the transmission of packets of other real-time characteristics that are not used. In the end, the indicator includes information for informing whether RTCP is used or not.

Next, a transmission processing procedure of a real time / non-real time packet according to the present invention will be described with reference to FIG. 4 based on the above description.

Referring to FIG. 4, the data source 70 intends to transmit a real time packet that requires state information for real time packet transmission, a real time packet that does not require state information for real time packet transmission, or a non-real time packet.

If a specific one packet transmission is required from the data source 70, the core network 300 is set up a radio access bearer with at least one terminal 100 (S10).                     

In the following description, an MBMS radio access bearer is set up to provide MBMS to corresponding terminals.

When the MBMS radio access bearer is established, the core network 300 determines the characteristics of the packet data to be transmitted from the data source 70 and informs the UTRAN 200.

That is, the SGSNs 40a to 40n of the core network 200 inform the UTRAN 70 whether packets to be transmitted from the data source 70 are non-real time or real time. SGSN 40 also informs UTRAN 200 whether RTCP is used for the transmission of real-time packets. At this time, the SGSN 40 uses an indicator. Here, an indicator for indicating whether a packet to be transmitted is a non-real time characteristic or a real time characteristic is called a packet characteristic indicator, and an indicator for indicating whether to use RTCP for transmission of a real time packet is called an RTCP usage indicator.

Accordingly, the UTRAN 200 determines whether to use the wired / wireless segmentation apparatus 80a to 80n based on the received indicator (S11).

After that, the packet of the data source 70 is transmitted to the RNCs 12a to 12n of the UTRAN 200 via the core network 300. (S12)

At this time, the RNC 12a to 12n of the UTRAN 200 has already determined whether to use the wired / wireless segmentation device 80a to 80n by the indicator received from the core network 300 in the process of setting up the radio access bearer. Therefore, the wired / wireless section separators 80a to 80n operate in the following two cases for received packets.

First, when the received packet is an RTP packet using RTCP, the wired / wireless section separator 80a to 80n may transmit status information (loss amount of the RTP packet) of the received RTP packet to the RTPC packet. It is included in the feed back to the data source 70 (S13). At this time, the RNCs 12a to 12n provide the RTP packets received through tunneling or inter-node communication to the wired / wireless section separators 80a to 80n.

In addition, the RNC 12a to 12n or the wired / wireless section separator 80a to 80n transmits the received RTP packet to the plurality of terminals 100 on the wireless section (S14). Here, the RTP packet transmitted to the plurality of terminals 100 is broadcasted and / or multicasted through a downlink common radio channel or a downlink dedicated radio channel.

Meanwhile, the data source 70 receiving the RTCP packet determines the data size and / or a suitable encoding scheme of the RTP packet to be transmitted later based on the state information included in the RTCP packet (S15).

In addition, the data source 70 may be transmitted later to prevent a large amount of RTP packets from entering the core network 300 and / or the UTRAN 200 that are highly conflicted based on the state information included in the RTCP packet. The routing information included in the RTP packet is changed as appropriate (S15).

In addition, the data source 70 regards each RTCP packet transmitted from the wired / wireless section separators 80a to 80n to be transmitted one by one for each wired / wireless section end point, and each bandwidth required for the transmission of the RTP packet and the RTCP packet. (Bandwidth) is appropriately determined (S15).

Meanwhile, the terminal 100 already knows the characteristics of a packet to be received in the process of establishing a radio access bearer with the core network 300. Accordingly, the terminal 100 receiving the RTP packet generates an RTCP packet including the number of lost RTP packets occurring during transmission on the wireless section and status information such as the transmission delay time of the received RTP packets, and the like. 12a to 12n) or feedback to the wired / wireless section separator 80a to 80n (S16).

Accordingly, the RNCs 12a to 12n or the wired / wireless section separators 80a to 80n each terminal on the wireless section based on the reception state information obtained from the RTCP packet transmitted from each terminal 100 on the wireless section. A transmission process of the RTP packet transmitted to 100 is performed (S18).

Also, as an option, the RNC 12a-12n or the wired / wireless section separator 80a-80n further feeds back the RTCP packet received from each terminal 100 to the data source 70. Accordingly, the data source 70 further refers to determining the data size of the RTP packet and / or a suitable encoding scheme, etc. for transmitting the RTCP packet fed back from each terminal 100.

Second, when the received packet is an RTP packet not using RTCP or a non-real time packet, that is, when the wired / wireless section separator 80 does not need to be used, the RNC 12a-12n establishes the core network 300. The received packet is transmitted to the plurality of terminals 100 on the radio section (S18).

At this time, since the RTCP itself is not used, the terminals 100 receiving the RTP packet do not perform any operation for generating the RTCP packet.

 According to the present invention, when a real-time data packet is transmitted in a wired / wireless integrated network using RTP and RTCP made for a wired network, an RTCP packet generated for control of the RTP packet is generated at each wired / wireless end. . That is, at the end of the wired section, the RTCP packet including the reception status information of the RTP packet received through the wired section is transmitted to the source of data through the wired section, and then the data source is transmitted in transmitting the RTP packet. Proper encoding can be made, accurate data transmission can be adjusted, bandwidth for RTP and RTCP can be accurately determined, and the situation of wired section can be accurately understood to control the whole network more effectively.

In addition, in the wireless section, only the wireless section is managed and controlled separately, so that the amount of data transmission can be adjusted by the wireless section itself to suit the situation of the wireless section.

By separating the wired section and the wireless section, it is possible to accurately distinguish whether the loss of the real-time data packet occurs in the wired section or the wireless section and the packet transmission delay in the wired section and the wireless section.

In addition, the MBMS can provide a more effective service when broadcasting and / or multicasting a real-time packet to a terminal.

In addition, in the present invention, when using a wired / wireless segmentation apparatus in UTRAN, it is to be applied only to a service using RTCP as well as real-time packet data, thereby determining such information when setting RAB or MBMS RAB. / Efficient use of wireless segmentation device.

In addition, by using the wire / wireless section separator more efficiently, it is more suitable for services that satisfy a specific QoS.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (20)

In the way that the core network transmits the packet, Determining a characteristic of a packet to be transmitted from the data source; Informing the terminal of the wired segment of the determined characteristics of the packet; Determining whether to use a wired / wireless section separator provided at an end of the wired section; And transmitting the packet of the data source to the end of the wireless section via the end of the wired section. The method of claim 1, wherein the characteristic of the packet is one of real time and non-real time. The method according to claim 1, wherein when setting a radio access bearer for the packet transmission between the core network and the end of the radio period, at least one indicator informs the characteristics of the determined packet. . 4. The method of claim 3, wherein the indicator is for indicating whether the wire / wireless segmentation device is used. The packet transmission according to claim 4, wherein when the characteristic of the packet is non-real time, an indicator for instructing off of the wired / wireless segmentation apparatus is transmitted to the end of the wired segment. Treatment method. 4. The method of claim 3, wherein the indicator further includes information for indicating whether to use a real time transmission protocol (RTP) and a real time transmission control protocol (RTCP). 4. The method of claim 3, wherein the radio access bearer is set up for transmitting media data of a multimedia broadcast / multicast service (MBMS). The method according to claim 1, wherein when the packet has a real time characteristic, a real time transport protocol (RTP) packet is transmitted to an end of the radio section. 9. The method of claim 8, wherein the terminal of the wired segment receiving the real time transmission protocol (RTP) packet receives the state information of the wired segment including the loss amount of the real time transmission protocol (RTP) packet. And inserting a packet and transmitting the packet to the data source. 10. The method of claim 9, wherein the data source monitors the state of the wired segment using the state information. A system comprising a terminal and a data source for providing a packet to the terminal, the system comprising: A wired / wireless section separating apparatus for distinguishing a wired section and a wireless section during packet transmission to the terminal; And a core network providing an indicator for turning on / off the wired / wireless segmentation device according to the characteristics of the packet. The method of claim 11, wherein the core network, Determining whether a packet to be transmitted from the data source is a real time packet or a non-real time packet, and generating an indicator according to the determined result when setting up a radio access bearer for packet transmission to the terminal. system. The method of claim 12, wherein the core network, And generating the indicator for turning off the wired / wireless section discriminator when the packet to be transmitted is a non-real-time packet. The apparatus of claim 11, wherein the wired / wireless segmentation device comprises: System for processing transmission of packets, characterized in that it is provided in the Universal Mobile Telecommunications Network Terrestrial Radio Access Network (UTRAN) for performing the transmission control of the radio section. The apparatus of claim 14, wherein the wired / wireless segmentation apparatus comprises: The packet transmission processing system, characterized in that provided in the Radio Network Controller (RNC) of the UTRAN. The apparatus of claim 14, wherein the wired / wireless segmentation apparatus comprises: Generating and providing to the data source a real time control protocol (RTCP) packet including status information for the wired section from the data source to the UTRAN and status information for the wireless section from the UTRAN to the terminal; A packet transmission processing system characterized by the above-mentioned. 17. The system of claim 16, wherein the state information for the wireless section is obtained from a real time control protocol (RTCP) packet generated by the terminal. 15. The method of claim 14, wherein the terminal and the data source transmit and receive real time packets using a real time transmission protocol / real time transmission control protocol (RTP / RTCP), a user datagram protocol (UDP), and an Internet protocol (IP), respectively. The UTRAN using a network access protocol for a wired connection with the wired section and a wireless access protocol for a wireless access with the wireless section is configured to transmit the real time transmission protocol to the upper layer of the network access protocol and the wireless access protocol. And relaying transmission and reception of the real time packet using a real time transmission control protocol (RTP / RTCP), the user datagram protocol (UDP), and the Internet protocol (IP). 19. The method of claim 18, further comprising: relaying transmission and reception of the real time packet using the real time transmission protocol / real time transmission control protocol (RTP / RTCP) of the UTRAN and the user datagram protocol (UDP) and the internet protocol (IP). And a radio network controller (RNC) in the UTRAN. The apparatus of claim 19, wherein the wired / wireless segmentation apparatus uses the real time transmission protocol / real time transmission control protocol (RTP / RTCP), the user datagram protocol (UDP), and the internet protocol (IP). And providing status information of a wired section of a real time packet to the data source, and monitoring a state of a wireless section according to transmission and reception of the real time packet.

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