KR100655589B1 - Wireless TV transceiver and transmission service method thereof - Google Patents

Abstract

The present invention provides a wireless transceiver and its A / V for stopping the A / V streaming or displaying a message indicating that the transmission status is poor when the channel rate of the wireless LAN is smaller than the A / V data rate. The present invention relates to a data transmission service method, which allows a user to know that a transmission delay or freeze is caused by a wireless network environment, and also affects different wireless A / V streaming products that share the same channel. Can be minimized.

Transceiver, transmission, channel, rate, wlan, interference

Description

Wireless TV transceiver and its A / W data transmission service method

1A illustrates a typical wireless TV system.

FIG. 1B is a diagram for explaining radio interference occurring in the system of FIG. 1A

2A is a block diagram illustrating a transceiver of a wireless TV according to the present invention.

2B is a block diagram illustrating an example of the main processor of FIG. 2A.

FIG. 2C is a block diagram illustrating an example of the WLAN driver of FIG. 2A.

3 is a flowchart illustrating an A / V data transmission service method according to the present invention.

Explanation of symbols on the main parts of the drawings

200: TV tuner unit 210: audio decoder

220: Audio ADC 230: Video Decoder

240: main processor 250: A / V data storage unit

260: WLAN driver

The present invention affects different wireless A / V streaming products that share the same channel by detecting transmission delay or freeze which occurs when the channel rate of the wireless LAN is lower than the threshold than the A / V data amount. The present invention relates to a wireless transceiver and its A / V data transmission service method for minimizing radio interference.

Recently, with the development of communication technology, a lot of wireless interface means have been developed, such as Bluetooth, Wireless Fidelity (WiFi), Ultra Wide Band (UWB) system, and Wireless Local Area Network (WLAN). In addition, as the transmission speed of the developed air interface means becomes very fast, a wireless TV has been developed in which the user can easily watch a predetermined broadcast signal while moving the user by applying the air interface means to the TV. Figure is a diagram.

As shown in the drawing, a general wireless TV is divided into a transceiver 100 for transmitting an AV signal wirelessly and a receiver 110 for receiving and displaying a stream transmitted wirelessly through a display unit, and the transceiver 100 is airwave broadcasting. Some are designed to convert analog signals from a DVD player, etc. into digital signals such as MPEG, and some are designed to store multiple media files using a PC and transmit them wirelessly without additional conversion.

The wireless TV may ignore transmission delay and freeze if the channel environment of the wireless LAN is good, but on the contrary, if the WLAN channel environment is worse, the transmission delay may be severe and the screen freeze may occur. One of the biggest causes is interference between wireless A / V streaming products, which will be described in more detail.

For example, if there is a wireless TV transmitting an A / V signal of about 1 Mbps, if the channel rate of the WLAN is set to about 2 Mbps, it will take about 1 second to transmit 1 Mbit of data. However, if the channel rate of the WLAN is set to 24Mbps, it will be able to transmit 1Mbit in less than 1/10 seconds.

Therefore, the higher the channel rate, the shorter the channel occupancy time, so that the channel can be used more effectively in the WLAN sharing the network. That is, when the channel rate is set to 24Mbps, another wireless device in the same channel may use the channel for a time of about 9/10 seconds, which will be described in more detail with reference to FIG. 1B.

As shown in the drawing, when several WLAN A / V streaming products are operating on the same wireless channel, if a channel rate of all the WLAN A / V streaming products is set to a high value, any one product is an A / V signal. After transmitting, the channel can be used by other A / V streaming products during the free time, thereby improving channel usage efficiency and reducing radio interference between products. However, if any one product is set to a low channel rate, the channel occupancy time is long, which causes other wireless A / V streaming products to use the channel.

For example, if all wireless A / V streaming products that transmit 1 Mbps streams have a channel rate set to 24 Mbps, up to five products can share the channel for one second, but any one product's channel rate is 2 Mbps. When dropped, it occupies the channel for one second, which results in other products 100, 101, 102, 103 not being able to occupy the channel.

Since the WLAN rate is automatically changed according to the wireless network environment, the WLAN cannot always maintain a high channel rate. In particular, if the receiver receiving streaming in the wireless LAN A / V streaming product suddenly powers down due to abnormal termination or the like, an appropriate response message is not received from the receiver. The rate is suddenly lowered.

Therefore, the wireless A / V streaming product adopting 802.11a / b / g wireless LAN stops streaming when the channel rate of the wireless LAN is smaller than the data amount of the A / V signal to be transmitted to other wireless A / V streaming products. It is necessary not to cause interference.

Accordingly, the present invention was developed to satisfy the above necessity, and detects the transmission delay or the screen stop phenomenon caused by the channel rate of the wireless LAN lower than the A / V data amount below the threshold, and shares the same channel in advance. The purpose of the present invention is to provide a wireless transceiver and its A / V data transmission service method for minimizing radio interference affecting different wireless A / V streaming products.

 Wireless transceiver according to the object of the present invention is characterized in that the main processor in the transceiver has an A / V data transmission management processor for determining whether to transmit the A / V data with reference to the channel rate information of the WLAN driver.

The main processor according to the present invention, for example, has a timer and an A / V data transmission management processor, and is a program executable by the A / V data transmission management processor, and the channel rate information and A obtained by the WLAN driver. Comparing the predetermined threshold channel rate information corresponding to different transmission rates of the / V data; Determining whether the comparison result of the process lasts longer than a predetermined threshold time; Determining whether to transmit the A / V data according to the result of the comparison and determination of the process; It may be made of a structure including a first recording medium in which a program for executing the recording.

According to an object of the present invention, the WLAN driver has an A / V data transmission management processor for periodically acquiring channel rate information and transmitting the same to the main unit.

According to an aspect of the present invention, there is provided a wireless LAN driver, which is a program executable by the A / V data transfer processor, including: transmitting a beacon packet to the receiver and periodically determining a response time of the receiver; Acquiring channel rate information according to the determining process; transmitting the channel rate information acquired according to the process to the A / V data transmission management processor; and a second recording medium having a program for executing the program included therein. It can be made of a structure.

In the A / V data transmission service method according to an object of the present invention, the transceiver acquires the channel rate information of the wireless LAN, and compares the threshold channel rate information with corresponding preset rate for different transmission rates of the A / V data according to the comparison result. It is characterized by determining whether to transmit the A / V data.

The threshold channel rate according to the present invention is characterized in that at least twice the transmission rate of the A / V data to be transmitted.

The present invention is characterized in that the channel rate information is periodically obtained through the response time of the receiver for the beacon packet transmitted by the WLAN driver in the transceiver for transmitting the A / V data.

According to the present invention, it is possible to determine whether to transmit A / V data only when the comparison result of the channel rate and the critical channel rate information of the WLAN satisfies a predetermined reliability condition.

The reliability condition according to the invention is characterized in that it is set whether or not the comparison result lasts more than a predetermined threshold time.

When it is determined that the A / V data transmission state is poor according to the present invention, the WLAN driver forcibly stops A / V streaming or displays a setting message indicating that the WLAN state is poor. It is done.

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

FIG. 2A illustrates a wireless transceiver according to an embodiment of the present invention, wherein a wireless transceiver according to the present invention acquires channel rate information of a wireless LAN and is correspondingly preset for each different transmission rate of A / V data. The operation of determining whether or not to transmit A / V data according to the comparison result is compared with the threshold channel rate information, that is, the operation of determining whether to transmit A / V data with reference to channel rate information of the WLAN driver. It has a structure that the processor processes.

First, the transceiver of the wireless TV according to the present invention includes a TV tuner 200, an audio decoder 210 for decoding an SIF signal into an analog audio signal, and an audio clock and an audio signal from an analog audio signal, as shown in FIG. 2A. The audio ADC 220 extracting the data, the video decoder 230 decoding the video signal received from the TV tuner 200 and outputting the video data, the video clock signal, and the video sync signal, respectively, the audio data and the video data An audio processor and a video processor, each of which are processed for processing, are embedded, and under the control of the main processor 240 and the main processor 240 having a predetermined processor (not shown) for determining whether to transmit A / V data according to the present invention. A / V data storage unit 250 for storing the processed A / V data, and transmits the A / V data channel channel of the wireless LAN to the main processor It consists of a WLAN driver 260 for outputting the information.

In the transceiver according to the present invention, the WLAN driver 260 periodically collects channel rate information of the WLAN for transmitting A / V data to the wireless receiver. For example, a beacon packet is configured as a setting unit. Channel rate information can be collected by periodically outputting the receiver to the receiver for checking the response time of the receiver.

The main processor 240 compares the channel rate information collected by the WLAN driver 260 with the predetermined threshold channel rate information corresponding to different transmission rates of the A / V data, and compares the A / V data according to the comparison result. In this case, whether or not the comparison result lasts more than a predetermined threshold time to improve the reliability, that is, to check whether the variation of the channel rate is temporary or continuous, is determined. This can be done before the transmission determination.

In other words, since the wireless environment changes from time to time, even if the channel rate falls below the threshold channel rate, the channel rate may recover immediately above the threshold value, and streaming may be stopped because it does not significantly affect transmission delay or freeze. There is no need to do this, so if the length of time that the channel rate is below the threshold persists, it can be checked whether it affects transmission delays or freezes.

On the other hand, if it is determined that the transmission state of the A / V data is poor as a result of the A / V data transmission determination, for example, the channel rate falls below the threshold channel rate and the state lasts longer than the threshold time so that A / V If it is determined that the data transmission status is poor, the A / V streaming may be stopped or a setting message indicating that the WLAN status is poor may be displayed.

For example, wireless A / V streaming products including wireless TVs transmit A / V signals of about 3 Mbps to 20 Mbps. At this time, the WLAN channel rate should be maintained at a minimum of 6 Mbps to 48 Mbps. If the WLAN channel rate is set to 3Mbps or less in the designed A / V streaming product, the transmission delay is severe and it is difficult for real-time wireless A / V service, so it stops streaming or informs the user of the situation that streaming is impossible. Can be.

The threshold channel rate value is a minimum value that must be set in order for the wireless A / V streaming service to be stably transmitted. For example, in the case of a wireless A / V streaming product that transmits an A / V signal of 3 Mbps, the threshold value of the channel rate is at least the transmission rate. It can be set twice, resulting in 6Mbps.

2B is a diagram illustrating a main processor 240 according to the present invention as an example. The main processor 240 according to the present invention refers to channel rate information of the WLAN driver 260 and transmits A / V data. A / V data transmission management processor to determine the.

For example, as shown in FIG. 2B, the main processor according to the present invention has a timer 243 and an A / V data transfer management processor 245, and is connected to the A / V data transfer management processor 245. A program executable by the method, the method comprising: comparing the channel rate information obtained by the WLAN driver 260 with threshold channel rate information corresponding to each other for different transmission rates of A / V data; Determining whether the comparison result of the process lasts longer than a predetermined threshold time; Determining whether to transmit the A / V data according to the result of the comparison and determination of the process; The first recording medium 244 in which a program for executing the program is recorded may be included.

The main processor 240 according to the present invention can be achieved by the channelizer monitoring module periodically monitors the channel wireless LAN channel rate according to the predetermined time data output from the timer 243, A / V data transmission management processor ( 245 reads the threshold time information and the threshold value of the channel rate through the program information recorded on the first recording medium 244, compares the channel rate monitored by the timer 243 with the threshold channel rate Stop the A / V streaming if the time for which the rate is kept below the threshold channel rate continues over the threshold time.

2C is a diagram illustrating a wireless LAN driver 260 according to an exemplary embodiment of the present invention. As shown in FIG. 2C, an A / V data transmission management processor 263 periodically acquires channel rate information and transmits it to a main unit. Has a structure.

For example, the wireless LAN driver 260 according to the present invention is a program executable by the A / V data transfer processor 263, as shown in FIG. 2C, and transmits a beacon packet to the receiver. Periodically determining the response time of the receiver and the receiver; Acquiring channel rate information according to the determining process; transmitting the channel rate information acquired according to the process to the A / V data transmission management processor; a second recording medium having recorded therein a program for executing In this case, the WLAN management manager 261 is a general module for managing output of A / V data according to the WLAN environment, and a detailed description thereof will be omitted herein.

The WLAN driver 260 may periodically collect channel rate information of the WLAN for transmitting A / V data to the wireless receiver using a program stored in the second recording medium. For example, the beacon packet may be periodically output to the receiver for a set unit time to check the response time of the receiver to collect channel rate information, and the collected information may be collected by the A / V data transmission management processor 263. To pass.

3 is a flowchart illustrating a method for transmitting A / V data of a wireless TV according to the present invention.

As shown in FIG. 3, the wireless A / V data transmission method according to the present invention first monitors the WLAN environment periodically (S300) and transmits the A / V data to the wireless receiver channel of the wireless LAN. Collecting rate information periodically (S302) and setting a timer (S301), information collection of the channel rate according to step (S302), for example, by periodically outputting the beacon (becon) packet to the receiver for a set unit time Channel rate information may be collected by checking the response time of the receiver.

Next, according to step S302, the channel rate information collected by the WLAN driver is compared with the threshold channel rate information corresponding to the respective transmission rates of the A / V data (S303), and the A / V according to the comparison result. In order to determine whether the data is transmitted or not, in order to further improve the reliability, that is, to check whether the variation of the channel rate is temporary or continuous, whether or not the comparison result lasts more than a predetermined threshold time is determined by A / V. This may be preceded before determining whether data is transmitted (S304).

In other words, since the wireless environment changes from time to time, even if the channel rate falls below the threshold channel rate, the channel rate may recover immediately above the threshold value, and streaming may be stopped because it does not significantly affect transmission delay or freeze. There is no need to do this, so if the length of time that the channel rate is below the threshold persists, it can be checked whether it affects transmission delays or freezes.

The threshold channel rate value of step S303 is a minimum value that must be set in order for the wireless A / V streaming service to be stably transmitted. For example, if the wireless A / V streaming product transmits an A / V signal of 3 Mbps, The threshold can be set at least twice the rate, resulting in 6Mbps.

On the other hand, if it is determined that the transmission state of the A / V data is poor as a result of the A / V data transmission determination, for example, the channel rate falls below the threshold channel rate and the state lasts longer than the threshold time so that A / V If it is determined that the data transmission state is bad, the A / V streaming may be stopped (S306), or a setting message indicating that the WLAN state is bad may be displayed (S307).

For example, wireless A / V streaming products including wireless TVs transmit A / V signals of about 3 Mbps to 20 Mbps. At this time, the WLAN channel rate should be maintained at a minimum of 6 Mbps to 48 Mbps. If the WLAN channel rate is set to 3Mbps or less in the designed A / V streaming product, the transmission delay is severe and it is difficult for real-time wireless A / V service, so it stops streaming or informs the user of the situation that streaming is impossible. Can be.

As described in detail above, the wireless transceiver and the A / V data transmission service method according to the present invention is a transmission delay or screen freeze phenomenon caused by the channel rate of the WLAN drops below the threshold than the A / V data amount This can minimize the radio interference affecting different wireless A / V streaming products that share the same channel.

Although the invention has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (8)

A video decoder and audio decoder for decoding A / V data received from an external device, a main processor for processing A / V data decoded by the video and audio decoder, and output A / V data processed by the main processor to a receiver. In the wireless transceiver comprising a WLAN driver, The main processor may compare the timer and A / V data transmission management processor with the channel rate information acquired by the WLAN driver and the threshold channel rate information corresponding to each other for different transmission rates of the A / V data. And a first recording medium having recorded thereon a program for executing the determination of whether or not to transmit the data. The WLAN driver transmits a beacon packet to the receiver, an A / V data transmission processor connected to the A / V data transmission management processor, and periodically determines a response time of the receiver to the channel rate information. And a second recording medium having a program recorded thereon, the program executing to transmit the obtained channel rate information to the A / V data transmission management processor. delete Obtaining, by the wireless TV transceiver, the channel rate information of the WLAN and comparing the channel rate information with corresponding preset channel rate information for different transmission rates of the A / V data; And And determining whether or not to transmit A / V data according to the comparison result. Comparing the channel rate information, the process of periodically obtaining the channel rate information through the response time of the receiver for the beacon (becon) packet transmitted by the wireless LAN driver in the transceiver, and the obtained channel rate information A / A / V data transmission service method of a transceiver of a wireless TV, characterized in that for each of the different data rates of the data transmission process corresponding to the predetermined threshold channel rate information. delete The method of claim 3, wherein Determining whether the comparison result satisfies a predetermined reliability condition; And determining whether or not to transmit the A / V data only when a predetermined reliability condition is satisfied. The method of claim 5, wherein the determining process; And determining whether the result of the comparison of the first process is longer than a predetermined threshold time. The method of claim 3, wherein The wireless LAN driver A / V data transmission service method, characterized in that further comprising the step of stopping the A / V streaming, if it is determined that the transmission of the A / V data is poor. . The method of claim 3, wherein If it is determined that the transmission of the A / V data, the A / V data transmission service method of the transceiver of the wireless transceiver, characterized in that for displaying a setting message indicating that the WLAN status is poor.

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