KR100794405B1 - Message transmission method in a control channel segmentation and reassembly layer, and processing apparatus thereof - Google Patents

Abstract

Disclosed are a message transmission method and a processing apparatus thereof in a control channel segmentation and reassembly layer (CCSRL) for minimizing call setup time for a video call. According to the present invention, a message transmission method is a method for transmitting a message from a control channel segmentation and reassembly layer (CCSRL) of a signaling channel to a lower layer during a video call. (A) If the message fails to be transmitted, the message fails to be transmitted. Dividing the data to be transmitted according to the size of the transmission free space of the next message to be transmitted and transmitting the divided message; And (b) if all of the failed messages have not been transmitted even after the predetermined number of the divided messages have been transmitted, priority is given to the transmission of the messages which have not yet been retransmitted among the messages that failed to be transmitted, It is characterized in that it comprises the step of transmitting the following message. Accordingly, it is possible to reduce the initialization time required to start the video call in all mobile communication terminals performing the video call.

Description

Message transmission method in a control channel segmentation and reassembly layer, and processing apparatus

1 is a schematic diagram of the 3G-324M standard,

2 is a diagram illustrating a protocol configuration of a signaling channel in FIG. 1;

3 is a diagram for explaining partitioning of a message into a maximum size of a message allowed by CCSRL;

FIG. 4 is a diagram for explaining splitting and transmitting a message according to FIG. 3; FIG.

5 is a diagram illustrating a message transmission flow of resending by attaching a message to message 5 when message 2 fails to transmit;

6 is a diagram illustrating a message transmission flow of retransmission by dividing message 5 and message 6 when message 2 fails to transmit;

FIG. 7 is a diagram illustrating a method of dividing a message R 700 which failed to be transmitted and attaching the message R 700 to a free space of a subsequent message.

8 shows that the message R 700 that failed to be transmitted is divided and retransmitted after attaching to a free space of the message, but when all the messages are not transmitted even after N times of transmission, the remaining parts have priority over the next message. Drawings to explain,

FIG. 9 is a diagram for explaining that when a message R 900 is divided and transmitted, priority is given to transmission of the next message A 930;

10 is a diagram illustrating a message transmission flow in which message 2 fails to transmit, retransmitting it with a transmission priority over message 5;

11 is a flowchart of a message transmission method according to a preferred embodiment of the present invention;

12 is a block diagram of a CCSRL processing apparatus according to a preferred embodiment of the present invention.

The present invention relates to a video call in a mobile communication terminal, and more particularly, to a message transmission method and a processing apparatus in a control channel segmentation and assembly layer (CCSRL) for minimizing call setup time for a video call. .

The 3rd Generation Project Partnership (3GPP), which discusses the asynchronous, third-generation global mobile telecommunications specification, chose the H.324M protocol for video communications in third-generation circuit-switched networks. H.324M is a standard proposed by the International Telecommunication Union (ITU) and is a protocol that enables multimedia communication in low-bit rate networks such as PSTN. A terminal equipped with H.324M can exchange multimedia data consisting of real-time video, audio, data, or a combination thereof with one or more terminals in a circuit switch network.

After the H.324M standard, 3GPP added H.324M Annex C to facilitate communication in error-prone networks. H.324M Annex C enhances the content, error detection and correction of codecs such as Adaptive Multi-Rate (AMR), H.263 and MPEG4, and is the basis of the 3G-324M standard. In recent years, the 3G-324M standard has been used not only in wideband CDMA (WCDMA) but also in other 3G networks because of its flexibility with multiple networks.

However, in transmitting an initial signaling message to set up a video communication channel using such a standard, when a message fails to be delivered in a CCSRL that decomposes and delivers data to a lower layer or combines data from a lower layer, transmission fails. Since it takes a long time to retransmit the message, the initial setup time for the video communication takes a lot of inconvenience that the user has to wait for a long time.

Accordingly, the technical problem to be achieved by the present invention is to perform the initial setup time of the video communication channel setup by efficiently performing retransmission of the signaling message in the CCSRL necessary for the initial setup process for the video communication in the mobile communication terminal. The present invention provides a method and apparatus for processing a message in a reduced CCSRL.

According to the present invention, in the method of transmitting a message from a control channel segmentation and reassembly layer (CCSRL) of a signaling channel to a lower layer during a video call, (a) if the message fails to be transmitted, Dividing the data to be transmitted according to the size of the transmission free space of the next message to be transmitted and transmitting the divided message; And (b) if all of the failed messages have not been transmitted even after the predetermined number of the divided messages have been transmitted, priority is given to the transmission of the messages which have not yet been retransmitted among the messages that failed to be transmitted, It is achieved by a message transmission method comprising the step of pasting the next message.

In the step (a), if there is no message to be pasted when the message failed to be transmitted and the second or later divided part is divided, the message failed to be transmitted is not divided. It is preferable to transmit without change.

In addition, it is more preferable to transmit the message that has failed the transmission without being divided, but transmit the message before the next message.

On the other hand, according to another field of the present invention, the technical problem is in the control channel segmentation and reassembly layer (CCSRL) processing apparatus of the signaling channel during a video call, if the transmission of the message fails, the message to be transmitted next message to be transmitted A message processing unit which transmits after dividing to fit the size of the transmission free space of the transmission; And when all of the failed messages have not been transmitted even after the predetermined number of the divided messages have been transmitted, priority is given to the transmission of the messages which have not yet been retransmitted among the failed messages, and the next message is stored in the free transmission space. It is also achieved by the CCSRL processing apparatus, characterized in that it comprises a priority adjustment unit for transmitting with.

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

1 is a schematic diagram of the 3G-324M standard.

Referring to FIG. 1, 3G-324M is divided into an in-band region and an out-band region. In the present invention, in particular, the present invention relates to transmission of a control message of a signaling channel in an in-band region.

The in-band region includes a data transmission region including a video encoder 110 and an audio encoder 120, a control unit 130 for managing transmission of control data, and a signaling channel for managing control data transmission through a signaling channel. The controller 140 and the multiplexing and demultiplexing unit 150 to bundle the video / audio / control data into a single bit stream exists.

The video encoder 110 performs video encoding according to H.263, H.264, and MPEG-4, and the audio encoder 120 performs audio encoding according to AMR, WB-AMR, and G.723.1. The controller 130 controls the transmission of the H.245 data managing the video data and the audio data. The signaling channel controller 140 manages the transmission of control data using a Control Channel Segmentation and Reassembly Layer (CCSRL), a numbered simple retransmission protocol (NSRP), or a window numbered simple retransmission protocol (WNSRP). The multiplexing and demultiplexing unit 150 is described in H.223 Annex B and H.223 Annex C. The multiplexing and demultiplexing unit 150 multiplexes video data, audio data, and control data into one bit stream, or generates one bit stream. Demultiplexing is made into video data, audio data and control data. The multiplexing and demultiplexing unit 150 also performs error detection and correction. The present invention relates to a CCSRL performed by the signaling channel controller 140.

FIG. 2 is a diagram illustrating a protocol configuration of a signaling channel in FIG. 1.

The H.245 210 performs two mobile communications for performing video communication by exchanging actual video data (H.263, H.264, MPEG-4) and audio data (AMR, WB-AMR, G.723.1). Data transmitted and received between terminals.

The CCSRL 220 is a control channel segmentation and recombination layer. When a message having a size larger than a predetermined maximum byte value comes down from the upper layer, the CCSRL 220 divides it and delivers the message to the lower layer. Bundled into a single message and delivered to the upper layer.

The NSRP / WNSRP 230 checks and retransmits a message that failed to be transmitted while transmitting an H.245 message.

The AL1 240 is one of the adaptation layers, which is performed by the multiplexing and demultiplexing unit 150 of FIG. 1 and multiplexed by adding an appropriate header according to the type of data to data coming from an upper layer. do. In this case, when the data descending from the upper layer is control data, AL1 is applied and AL2 is applied to the actual video data or audio data.

FIG. 3 is a diagram for explaining partitioning of a message into a maximum size of a message allowed by CCSRL.

The maximum size of a message that can be transmitted from a CCSRL to a lower layer such as the NSRP / WNSRP 230 layer is generally set to 256 bytes. Therefore, we split this message to send a message larger than 256 bytes to the lower layer. For example, as shown in FIG. 3, if the size of message A 300 is 300 bytes, 256 bytes of message A1 310, which is the maximum size that can be transmitted in CCSRL, and 44 bytes of message A2 320, which is the remaining size, are the maximum. Divide by) Then, these divided messages 310 and 320 are transmitted, respectively.

FIG. 4 is a diagram for describing a method of dividing and transmitting a message according to FIG. 3.

Referring to FIG. 4, after transmitting 256 bytes of message A1 310, 44 bytes of message A2 320 are transmitted. Then send the next message, message B. Referring to FIG. 4, it can be seen that there is a waste of bandwidth at the time when the message A2 320 is transmitted. That is, although only up to 256 bytes can be transmitted, only 44 bytes are transmitted, which wastes bandwidth. On the other hand, after receiving each message, a response message is returned.

5 is a diagram illustrating a message transmission flow of retransmitting message 2 when it fails to transmit.

As described above with reference to FIG. 4, if a message is divided and transmitted one by one in the next turn, bandwidth is wasted. Therefore, a message to be retransmitted due to a transmission failure is piggybacked on another message. In transmitting a message in accordance with the maximum size of a transmission message allowed by the CCSRL layer, the message that is not transmitted is divided into the remaining portions of the message to be transmitted and is called a piggy-back method.

For example, if message ## 2 500 of the second byte of 44 bytes is lost in the transmission process, message ### 500 of message # 2 is not received until Wa # 3, which is a response message to message # 3, is received. Since the response message was not received, it can be seen that the second message W # 2 500 failed to transmit. If it is found that the transmission failed, the message ## W # 2 (500) is attached to the free space of message # 5, W # 5, which is a message existing at the next message transmission time.

6 is a diagram illustrating a message transmission flow in which message 2 fails to be transmitted, divided into messages 5 and 6 and retransmitted.

If the size of W # 2 600, the second message that fails to be transmitted, is larger than the remaining free space of W # 5, the fifth message is split. That is, the data is divided (610) into a size that can be allocated to the remaining free space of message ## 5 and transmitted, and the remainder 620 is transmitted by attaching to the free space of message ## 6.

FIG. 7 is a diagram for describing a method of dividing a message R 700 that fails to be transmitted and attaching the message R 700 to a free space of a later message. FIG.

If the size of the message R 700 to be retransmitted is 100 bytes, it is divided, and then the messages are attached to the free space of the message A 750, the message B 751, and the message N 752. If the size of message A 750 is 226 bytes, the size of message B 751 is 246 bytes, and the size of message N 752 is 236 bytes, message R 700 is divided into message R1 710. In addition, the message is divided into a message R2 720 and a message RN 730, and transmitted in the free space of the message A 750, the message B 751, and the message N 752.

8 shows that the message R 700 that failed to be transmitted is divided and retransmitted after attaching to a free space of the message, but when all the messages are not transmitted even after N times of transmission, the remaining parts have priority over the next message. It is a figure for demonstrating.

Referring to FIG. 8, if all of the message R 800 failed to be transmitted even after transmitting the Nth next message, the remaining portion 840 of the message R takes precedence over the next message N + 1 854. You can see that the messages are created and sent with a ranking.

FIG. 9 is a diagram for explaining that when a message R 900 is divided and transmitted, priority is given to transmission of the next message A 930.

If the size of the message R 900 to be retransmitted is 356 bytes so that the size of one transmittable message is larger than 256 bytes, the message R 900 is divided into a 256-byte message R1 910 and the remaining size 100 bytes. After splitting into R2 920, the message R1 910 is transmitted first, and then the message R2 920 piggy-backs to the next message A 930. At this time, the message R2 920 is given a higher priority than the message A 930, and the message A 930 is piggybacked in the free space of the message R2 920.

If the free space of the message R2 920 is not sufficient, the message A 930 is divided and piggy-backed to the next message and transmitted.

FIG. 10 is a diagram illustrating a message transmission flow in which message 2 fails to be transmitted and retransmitted with a transmission priority over message 5.

If the transmission loss of message 2 # W # 2 occurs, message 2 # W # 2 should be piggy-backed in the free space of message 5 # W # 5 in the transmission order of message 5 # W # 5. When splitting message W # 5, there may not be a next message to piggy back the split second and later messages. Referring to FIG. 10, when the free space of message 5 ## becomes 44 bytes or less, and splitting message 2 # W2, some of the divided messages may be piggybacked back to message # 5 # 5. Since there is no message to piggyback the rest of the message, message 2 is sent without splitting W # 2. In this case, message #### 2 may be transmitted by giving priority to message # 5 ##.

11 is a flowchart of a message transmission method according to a preferred embodiment of the present invention.

If the message fails to be transmitted, the message that fails to be transmitted is divided to fit the size of the transmission free space of the next message to be transmitted (S1110). The maximum allowable size of a message to be sent in the CCSRL is 256 bytes, so the free transfer space is 256 bytes minus the size of the next message to be sent. Then, the message divided at the transmission timing of the next message is piggy-backed and transmitted (S1120). On the other hand, if there is no message to be sent by pasting the second and subsequent split parts when the message failed to be transmitted, the message that failed to be transmitted can be transmitted as is without being split, and priority is given to the transmission over other next messages. You can put it.

In addition, if it is determined that all the messages that failed to be transmitted are not transmitted even after the predetermined number (N) of the divided messages are transmitted (S1130), and if it is determined that the messages have not been transmitted, the messages that have not yet been transmitted have not been retransmitted. Priority is given to the transmission, and the next message is transmitted in the transmission free space (S1140).

12 is a block diagram of a CCSRL processing apparatus according to a preferred embodiment of the present invention.

The CCSRL processing apparatus includes a message processing unit 1210 and a priority adjusting unit 1220. When the message processing unit 1210 fails to transmit the message, the message processing unit 1210 divides the message that fails to be transmitted to fit the size of the transmission free space of the next message to be transmitted and transmits the message through the message transmission unit 1230. When the priority adjusting unit 1220 fails to transmit all of the failed messages even after transmitting a predetermined number of divided messages, the priority adjusting unit 1220 gives priority to the transmission of the messages that have not yet been retransmitted among the failed messages, and the transmission free space. Send the following message to

On the other hand, the above-described message transmission method can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the program is stored in a computer readable media, and read and executed by a computer to implement a message transmission method. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, an initialization time required to start a video call can be reduced in all mobile communication terminals performing video calls using 3G-324M.

In other words, the WNSRP method generally takes about 3 seconds to initialize the video call, whereas the message piggy-back method in the CCSRL of the present invention can greatly reduce the initialization time. When the initialization time is shortened during the video call, the time required for the user to wait for starting the video call becomes similar to the waiting time for starting the general call, thereby facilitating the use of the video call.

Claims (8)

In a method of transmitting a message from a control channel segmentation and reassembly layer (CCSRL) of a signaling channel to a lower layer during a video call, (a) If the message fails to be transmitted, the message that failed to be transmitted is divided into pieces according to the amount of free space for the next message to be transmitted, and then transmitted, and the second and subsequent divisions when the message failed to be transmitted are divided. If there is no message to be pasted, transmitting the message that has failed to be transmitted without being divided; And (b) If all of the failed messages have not been transmitted even after the predetermined number of the divided messages have been transmitted, priority is given to the transmission of messages that have not yet been retransmitted among the messages that failed to be transmitted, and next to the free transmission space. And transmitting the message by pasting it. The method of claim 1, The size of the transmission free space is a message transmission method, characterized in that the size of the maximum transmission size defined by the CCSRL minus the size of the actual message to be transmitted. delete The method of claim 1, The message transmission method, characterized in that for transmitting the message that has failed to be transmitted without splitting, but transmits before the next message. The method according to any one of claims 1, 2 and 4, The signaling channel during the video call is a signaling channel according to 3G-324M standard. In the apparatus for processing a control channel segmentation and reassembly layer (CCSRL) of a signaling channel in a video call, If the message fails to be sent, the message that failed to be transmitted is divided into pieces to fit the amount of free space for the next message to be sent, and the message to be sent is pasted after the second and subsequent splits are made. If there is no message, the message processing unit for transmitting as it is without splitting the message that failed to transmit; And If all of the failed messages have not been transmitted even after the predetermined number of the divided messages have been transmitted, priority is given to the transmission of messages that have not yet been retransmitted among the messages that failed to be transmitted, and the next message is added to the free space. CCSRL processing apparatus comprising a priority adjusting unit for transmitting. The method of claim 6, The size of the transmission free space is a CCSRL processing apparatus, characterized in that the size of the maximum transmission size defined by the CCSRL minus the size of the actual message to be transmitted. delete

Images