WO2008078853A1 - Method for receiving efficient video using received signal strength notification mechanism in iptv environment - Google Patents
Method for receiving efficient video using received signal strength notification mechanism in iptv environment Download PDFInfo
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- WO2008078853A1 WO2008078853A1 PCT/KR2007/000816 KR2007000816W WO2008078853A1 WO 2008078853 A1 WO2008078853 A1 WO 2008078853A1 KR 2007000816 W KR2007000816 W KR 2007000816W WO 2008078853 A1 WO2008078853 A1 WO 2008078853A1
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- WIPO (PCT)
- Prior art keywords
- signal
- strength
- bit rate
- received
- content data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
Definitions
- the present invention relates to the transmission of content data depending on received signal strength in a mobile Internet Protocol Television (hereinafter referred to as 'IPTV) environment and, more particularly, to a method of transmitting content data depending on signal strength, which varies the data transmission rate according to the strength of a received signal in the mobile IPTV environment and can transmit content data at the varied data transmission rate.
- 'IPTV mobile Internet Protocol Television
- FIG. 1 is a diagram showing the construction of ajypical system for IPTV service.
- the system for IPTV service includes a server system that includes an IPTV server 20, that is, a Service Provider (SP), for performing subscriber access management, and content data transmission control for providing IPTV service, a Streaming Server (SS) 20 for encoding content, which is transmitted to a user, to streaming data and transmitting the encoded data under the control of the IPTV server 10, and a content providing server 30, that is, a Content Provider (CP), for providing the content, an access network that includes a PSTN, a mobile communication network, the like for supporting network communication based on the Internet Protocol (IP), subscriber access units that provide respective access points, such as a base station 41, an access point 42 and a Local Area Network (LAN) 43, and subscriber devices 50, such as a TV, a mobile terminal and a computer, that receive the IPTV service via the subscriber access units.
- IP Internet Protocol
- subscriber access units that provide respective access points, such as a base station 41, an access point 42 and a Local Area Network (LAN) 43
- IPTV service provided by the construction of the above-described system enables content, which is transmitted via a wired and wireless network in a streaming fashion using the Internet Protocol (IP), to be viewed via a TV set, and provides multimedia service, such as TV/video/audio/text data, which is transmitted via an IP-based network that provides a required level of Quality of Service/Quality of Experience (QoS/QoE), information protection, interactivity and reliability.
- IP Internet Protocol
- QoS/QoE Quality of Service/Quality of Experience
- a mobile environment has characteristics such that the communication bandwidth is low and variation in the strength of a signal received from the base station or each access point occurs frequently due to interference from and the influence of the surroundings. Furthermore, variation in the strength of the signal is also caused by a user's movements. In the case where the variation in the strength of the signal occur frequently due to the user's movements, in particular, in the case where the strength of the signal is low, the interruption of received images occurs due to a high error rate and a high loss rate when content having a high bit rate is transmitted.
- an object of the present invention is to provide a method of transmitting content data depending on signal strength in a mobile IPTV environment, which, after pieces of video content having different bit rates and a multiplexer are stored in a server (hereinafter referred to as a 'media server') for storing content data for providing IPTV service, causes a mobile terminal to notify the media server of variation in the strength of the currently received signal whenever the mobile terminal detects such variation in the strength of the signal, thus enabling the media server to transmit content having a suitable bit rate.
- a server hereinafter referred to as a 'media server'
- the present invention provides a method of transmitting content data depending on signal strength in a mobile
- IPTV environment including a received-signal-variation notification process of a mobile terminal detecting the strength of a received radio signal and providing a media server with a notification message when the detected signal strength is greater than an allowable variation value; and a transmission bit rate conversion process of the media server receiving a received signal strength variation value, which is included in the notification message, and performing conversion such that content data, having a bit rate suitable for the strength of the received signal, is transmitted to the mobile terminal.
- the received-signal-variation notification process includes a signal strength detection step of the mobile terminal detecting the strength of the received radio signal, storing the detected signal strength as the strength of a currently received signal, and obtaining a difference between the strength of the currently received signal and the strength of a previously received signal; a comparison step of comparing a value of the detected difference between the signal strengths, which is obtained at the signal strength detection step, with a predetermined threshold value; a bit rate calculation step of calculating a receptible bit rate of the corresponding signal, if, as a result of the comparison of the comparison step, the value of the detected difference between the signal strengths is greater than the predetermined threshold value; and a received bit rate notification step of notifying the media server of a result value, which is obtained from the calculation of the bit rate calculation step, as the notification message.
- the transmission bit rate conversion process includes a content data selection step of selecting content data having a bit rate closest to the receptible bit rate of the mobile terminal, which is included in the notification message; and a data transmission rate conversion step of detecting a region of previously transmitted content data from the selected content data, and transmitting the content data from the corresponding region in a streaming fashion.
- the present invention enables a user to uninterruptedly receive service by varying the bit rate of content transmitted to a mobile terminal according to the strength of the signal received by the mobile terminal and transmitting the resultant content, so that the quality of the IPTV service can be remarkably improved.
- FIG. 1 is a diagram showing the construction of a typical network for IPTV service
- FIG. 2 is a flowchart illustrating processing in a mobile terminal in a method of transmitting content data depending on signal strength in a mobile IPTV environment, according to the present invention.
- FIG. 3 is a flowchart illustrating processing in a media server, which is performed in response to the reception of a notification message transmitted as a result of the processing of FIG. 2, according to an embodiment of the present invention.
- FIG. 2 is a flowchart illustrating a process of a mobile terminal calculating a transmissible bit rate_according to the strength of a received signal, and providing the media server with a notification message in a method of transmitting content data depending on signal strength in a mobile IPTV environment, according to the present invention.
- the mobile terminal in order to transmit the notification message to the media server based on the strength of a signal, the mobile terminal initializes a previous signal strength value 'pRSS', a current signal strength value 'cRSS', and variation in signal strength 'DIFF' at a starting step S 1. After the initialization process of the step Sl has been performed, the mobile terminal updates the previous signal strength value 'cRSS' using current signal strength, and calculates the variation in signal strength 'DIFF' at step S2.
- step S2 the mobile terminal determines whether the calculated variation in signal strength 'DIFF' is greater than a predetermined threshold value 'THdiff at step S3. If, as a result of the determination of step S3, it is determined that the calculated variation in signal strength 'DIFF' is not greater than the predetermined threshold value 'THdiff,' the process returns to step S2, and the processings are repeated. In contrast, if, as a result of the determination of step S3, it is determined that the calculated variation in signal strength 'DIFF' is greater than the predetermined threshold value 'THdiff,' it is determined that the variation in signal strength is sufficiently great, and an updated current signal strength value is compared with a minimum required threshold value 'THmin' at step S4.
- step S4 If, as a result of the comparison of step S4, the current signal strength value is equal to or smaller than the minimum required threshold value, the mobile terminal transmits a temporary-video-interruption control message to the media server, and waits while monitoring the current signal strength until the current signal strength improves at step S5. In contrast, if, as a result of the comparison of step S4, the current signal strength value is greater the minimum required threshold value, the bit rate 'cRATE' of a video source to be newly received is estimated, and then an estimated value is transmitted to the media server at step S6.
- step S6 whether content data reception service is terminated is determined. If it is determined that the content data reception service has been terminated, the process is terminated. In contrast, if it is determined that content data reception service is not terminated, the process returns to step S2 and the processings are repeated at step S7.
- FIG. 3 is a flowchart illustrating a process in the media server, which is performed in response to the reception of a notification message transmitted as a result of the processing of FIG. 2, according to an embodiment of the present invention.
- the media server transmits a video source at a bit rate that is predetermined at an early stage at step SI l.
- the media server After having received the notification message while waiting for the notification message transmitted from the mobile terminal at step S 12, the media server determines whether the received notification message is bit rate information at step S 13. If, as a result of the determination of step Sl 3, it is determined that the received notification message is not bit rate information, appropriate message processing is performed. Furthermore, if it is determined that the received notification message is not bit rate information, it is determined that the strength of the signal received by the terminal is not sufficiently great, and a process of temporarily interrupting the transmission of the video source is performed at step S 14.
- the media server transmits a video source (content data) having the value closest to the received bit rate information, among various video sources which have different bit rates and are stored on the media server, at step Sl 5.
- step 16 Thereafter, whether the transmission of the content data is completed is determined at step 16. If it is determined that the transmission of the content data has not been completed, the process returns to step SI l and the processings are repeated. In contrast, if it is determined that the transmission of the content data has been completed, the process is terminated.
- the present invention allows the media server to accurately measure the available bandwidth that can be used for transmission to the mobile terminal, thus enabling content data (video source) to be efficiently transmitted.
- the present invention is applicable to an IPTV mobile field, and thus can provide IPTV service that is not affected by variation in a telephony environment.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
An object of the present invention is to provide a method of transmitting content data depending on signal strength, which varies the data transmission rate according to the strength of a received signal in the mobile Internet Protocol Television (IPTV) environment and can transmit data at the varied data transmission rate. The method includes a received-signal-variation notification process of a mobile terminal detecting the strength of a received radio signal and providing a media server with a notification message when the detected signal strength is greater than an allowable variation value; and a transmission bit rate conversion process of the media server receiving a received signal strength variation value, which is included in the notification message, and performing conversion such that content data, having a bit rate suitable for the strength of the received signal, is transmitted to the mobile terminal.
Description
METHOD FOR RECEIVING EFFICIENT VIDEO USING RECEIVED SIGNAL STRENGTH NOTIFICATION MECHANISM IN IPTV ENVIRONMENT
Technical Field
The present invention relates to the transmission of content data depending on received signal strength in a mobile Internet Protocol Television (hereinafter referred to as 'IPTV) environment and, more particularly, to a method of transmitting content data depending on signal strength, which varies the data transmission rate according to the strength of a received signal in the mobile IPTV environment and can transmit content data at the varied data transmission rate.
Background Art
FIG. 1 is a diagram showing the construction of ajypical system for IPTV service.
As shown in FIG. 1, the system for IPTV service includes a server system that includes an IPTV server 20, that is, a Service Provider (SP), for performing subscriber access management, and content data transmission control for providing IPTV service, a Streaming Server (SS) 20 for encoding content, which is transmitted to a user, to streaming data and transmitting the encoded data under the control of the IPTV server 10, and a content providing server 30, that is, a Content Provider (CP), for providing the content, an access network that includes a PSTN, a mobile communication network, the like for supporting network communication based on the Internet Protocol (IP), subscriber access units that provide respective access points, such as a base station 41, an access point 42 and a Local Area Network (LAN) 43, and subscriber devices 50, such as a TV, a mobile terminal and a computer, that receive the IPTV service via the subscriber access units.
The IPTV service provided by the construction of the above-described system enables content, which is transmitted via a wired and wireless network in a streaming fashion using the Internet Protocol (IP), to be viewed via a TV set, and provides multimedia service, such as TV/video/audio/text data, which is
transmitted via an IP-based network that provides a required level of Quality of Service/Quality of Experience (QoS/QoE), information protection, interactivity and reliability.
In the conventional technology having the above-described construction, a method of transmitting content, which is encoded at a single bit rate when content data is transmitted, is used for IPTV service.
However, a mobile environment has characteristics such that the communication bandwidth is low and variation in the strength of a signal received from the base station or each access point occurs frequently due to interference from and the influence of the surroundings. Furthermore, variation in the strength of the signal is also caused by a user's movements. In the case where the variation in the strength of the signal occur frequently due to the user's movements, in particular, in the case where the strength of the signal is low, the interruption of received images occurs due to a high error rate and a high loss rate when content having a high bit rate is transmitted.
That is, in the conventional IPTV service system, described above, content data to be transmitted is encoded at a single bit rate, so that there are problems in that appropriate adjustments for a mobile radio wave environment and the user's motion characteristics cannot be made, and thus the quality of IPTV service is degraded.
Disclosure of the Invention
Technical tasks to be solved bv the invention Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method of transmitting content data depending on signal strength in a mobile IPTV environment, which, after pieces of video content having different bit rates and a multiplexer are stored in a server (hereinafter referred to as a 'media server') for storing content data for providing IPTV service, causes a mobile terminal to notify the media server of variation in the strength of the currently received signal whenever the mobile terminal detects such variation in the strength of the signal, thus enabling the media server to transmit content having a suitable bit rate.
Technical Solution
In order to accomplish the above object, the present invention provides a method of transmitting content data depending on signal strength in a mobile
IPTV environment, the method including a received-signal-variation notification process of a mobile terminal detecting the strength of a received radio signal and providing a media server with a notification message when the detected signal strength is greater than an allowable variation value; and a transmission bit rate conversion process of the media server receiving a received signal strength variation value, which is included in the notification message, and performing conversion such that content data, having a bit rate suitable for the strength of the received signal, is transmitted to the mobile terminal.
The received-signal-variation notification process includes a signal strength detection step of the mobile terminal detecting the strength of the received radio signal, storing the detected signal strength as the strength of a currently received signal, and obtaining a difference between the strength of the currently received signal and the strength of a previously received signal; a comparison step of comparing a value of the detected difference between the signal strengths, which is obtained at the signal strength detection step, with a predetermined threshold value; a bit rate calculation step of calculating a receptible bit rate of the corresponding signal, if, as a result of the comparison of the comparison step, the value of the detected difference between the signal strengths is greater than the predetermined threshold value; and a received bit rate notification step of notifying the media server of a result value, which is obtained from the calculation of the bit rate calculation step, as the notification message. The transmission bit rate conversion process includes a content data selection step of selecting content data having a bit rate closest to the receptible bit rate of the mobile terminal, which is included in the notification message; and a data transmission rate conversion step of detecting a region of previously transmitted content data from the selected content data, and transmitting the content data from the corresponding region in a streaming fashion.
Advantageous Effects
In a mobile IPTV environment, the present invention enables a user to uninterruptedly receive service by varying the bit rate of content transmitted to a mobile terminal according to the strength of the signal received by the mobile
terminal and transmitting the resultant content, so that the quality of the IPTV service can be remarkably improved.
Brief Description of Drawings
FIG. 1 is a diagram showing the construction of a typical network for IPTV service;
FIG. 2 is a flowchart illustrating processing in a mobile terminal in a method of transmitting content data depending on signal strength in a mobile IPTV environment, according to the present invention; and
FIG. 3 is a flowchart illustrating processing in a media server, which is performed in response to the reception of a notification message transmitted as a result of the processing of FIG. 2, according to an embodiment of the present invention.
Best Mode for Carrying Out the Invention
The present invention is described in more detail below with reference to the accompanying drawings, which show a preferred embodiment of the present invention.
FIG. 2 is a flowchart illustrating a process of a mobile terminal calculating a transmissible bit rate_according to the strength of a received signal, and providing the media server with a notification message in a method of transmitting content data depending on signal strength in a mobile IPTV environment, according to the present invention.
As shown in FIG. 2, in order to transmit the notification message to the media server based on the strength of a signal, the mobile terminal initializes a previous signal strength value 'pRSS', a current signal strength value 'cRSS', and variation in signal strength 'DIFF' at a starting step S 1. After the initialization process of the step Sl has been performed, the mobile terminal updates the previous signal strength value 'cRSS' using current signal strength, and calculates the variation in signal strength 'DIFF' at step S2.
After step S2 has been performed, the mobile terminal determines whether the calculated variation in signal strength 'DIFF' is greater than a predetermined threshold value 'THdiff at step S3.
If, as a result of the determination of step S3, it is determined that the calculated variation in signal strength 'DIFF' is not greater than the predetermined threshold value 'THdiff,' the process returns to step S2, and the processings are repeated. In contrast, if, as a result of the determination of step S3, it is determined that the calculated variation in signal strength 'DIFF' is greater than the predetermined threshold value 'THdiff,' it is determined that the variation in signal strength is sufficiently great, and an updated current signal strength value is compared with a minimum required threshold value 'THmin' at step S4. If, as a result of the comparison of step S4, the current signal strength value is equal to or smaller than the minimum required threshold value, the mobile terminal transmits a temporary-video-interruption control message to the media server, and waits while monitoring the current signal strength until the current signal strength improves at step S5. In contrast, if, as a result of the comparison of step S4, the current signal strength value is greater the minimum required threshold value, the bit rate 'cRATE' of a video source to be newly received is estimated, and then an estimated value is transmitted to the media server at step S6.
After step S6, whether content data reception service is terminated is determined. If it is determined that the content data reception service has been terminated, the process is terminated. In contrast, if it is determined that content data reception service is not terminated, the process returns to step S2 and the processings are repeated at step S7.
The process in the media server is described below. FIG. 3 is a flowchart illustrating a process in the media server, which is performed in response to the reception of a notification message transmitted as a result of the processing of FIG. 2, according to an embodiment of the present invention.
As shown in FIG. 3, the media server transmits a video source at a bit rate that is predetermined at an early stage at step SI l.
After having received the notification message while waiting for the notification message transmitted from the mobile terminal at step S 12, the media server determines whether the received notification message is bit rate information at step S 13.
If, as a result of the determination of step Sl 3, it is determined that the received notification message is not bit rate information, appropriate message processing is performed. Furthermore, if it is determined that the received notification message is not bit rate information, it is determined that the strength of the signal received by the terminal is not sufficiently great, and a process of temporarily interrupting the transmission of the video source is performed at step S 14.
In contrast, if, as a result of the determination of step S 13, it is determined that the received notification message is bit rate information, the media server transmits a video source (content data) having the value closest to the received bit rate information, among various video sources which have different bit rates and are stored on the media server, at step Sl 5.
Thereafter, whether the transmission of the content data is completed is determined at step 16. If it is determined that the transmission of the content data has not been completed, the process returns to step SI l and the processings are repeated. In contrast, if it is determined that the transmission of the content data has been completed, the process is terminated.
As described above, the present invention allows the media server to accurately measure the available bandwidth that can be used for transmission to the mobile terminal, thus enabling content data (video source) to be efficiently transmitted.
Although, in the above description of the present invention, a detailed embodiment has been described, various modifications may be made without departing from the scope of the present invention. Accordingly, the scope of the invention should be defined by the claims rather than the described embodiment.
Industrial Applicability
The present invention, described above, is applicable to an IPTV mobile field, and thus can provide IPTV service that is not affected by variation in a telephony environment.
Claims
1. A method of transmitting content data depending on signal strength in a mobile Internet Protocol Television (IPTV) environment, the method comprising: a received-signal-variation notification process of a mobile terminal detecting strength of a received radio signal and providing a media server with a notification message when the detected signal strength is greater than an allowable variation value; and a transmission bit rate conversion process of the media server receiving a received signal strength variation value, which is included in the notification message, and performing conversion such that content data, having a bit rate suitable for the strength of the received signal, is transmitted to the mobile terminal.
2. The method according to claim 1, wherein the received-signal- variation notification process comprises: a signal strength detection step of the mobile terminal detecting the strength of the received radio signal, storing the detected signal strength as strength of a currently received signal, and obtaining a difference between the strength of the currently received signal and strength of a previously received signal; a comparison step of comparing a value of the detected difference between the signal strengths, which is obtained at the signal strength detection step, with a predetermined threshold value; a bit rate calculation step of calculating a receptible bit rate of the corresponding signal, if, as a result of comparison of the comparison step, the value of the detected difference between the signal strengths is greater than the predetermined threshold value; and a received bit rate notification step of notifying the media server of a result value, which is obtained from the calculation of the bit rate calculation step, as the notification message.
3. The method according to any one of claims 1 and 2, wherein the transmission bit rate conversion process comprises: a content data selection step of selecting content data having a bit rate closest to the receptible bit rate of the mobile terminal, which is included in the notification message; and a data transmission rate conversion step of detecting a region of previously transmitted content data from the selected content data, and transmitting the content data from the corresponding region in a streaming fashion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2006-0133718 | 2006-12-26 | ||
| KR1020060133718A KR100880568B1 (en) | 2006-12-26 | 2006-12-26 | Mobile data transmission method according to signal strength in environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008078853A1 true WO2008078853A1 (en) | 2008-07-03 |
Family
ID=39562633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2007/000816 Ceased WO2008078853A1 (en) | 2006-12-26 | 2007-02-15 | Method for receiving efficient video using received signal strength notification mechanism in iptv environment |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100880568B1 (en) |
| WO (1) | WO2008078853A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8531979B2 (en) | 2009-09-30 | 2013-09-10 | Sony Corporation | Wireless link quality monitoring in network-enabled TVs |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170098632A (en) * | 2016-02-22 | 2017-08-30 | 에스케이텔레콤 주식회사 | Encoder apparatus and method for providing video data thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040017790A1 (en) * | 2002-07-25 | 2004-01-29 | Koninlijke Philips Electronics N.V. | Method and system for generating and updating transmission rate for link adaptation in IEEE 802.11 WLAN |
| US20040110470A1 (en) * | 2002-12-09 | 2004-06-10 | Tsien Chih C. | Method and apparatus to control transmitter |
| US20060187885A1 (en) * | 2005-02-23 | 2006-08-24 | Interdigital Technology Corporation | Wireless communication method and apparatus for dynamically adapting packet transmission rates |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498814B1 (en) * | 1999-07-20 | 2002-12-24 | Koninklijke Philips Electronics N.V. | Drift-free transcoder and related method |
| JP3832321B2 (en) | 2001-11-20 | 2006-10-11 | 日本電気株式会社 | Broadcast communication integrated terminal and content distribution system |
| US7636132B2 (en) * | 2003-04-17 | 2009-12-22 | Sharp Kabushiki Kaisha | Transmitter, receiver, wireless system, control method, control program, and computer-readable recording medium containing the program |
-
2006
- 2006-12-26 KR KR1020060133718A patent/KR100880568B1/en not_active Expired - Fee Related
-
2007
- 2007-02-15 WO PCT/KR2007/000816 patent/WO2008078853A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040017790A1 (en) * | 2002-07-25 | 2004-01-29 | Koninlijke Philips Electronics N.V. | Method and system for generating and updating transmission rate for link adaptation in IEEE 802.11 WLAN |
| US20040110470A1 (en) * | 2002-12-09 | 2004-06-10 | Tsien Chih C. | Method and apparatus to control transmitter |
| US20060187885A1 (en) * | 2005-02-23 | 2006-08-24 | Interdigital Technology Corporation | Wireless communication method and apparatus for dynamically adapting packet transmission rates |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8531979B2 (en) | 2009-09-30 | 2013-09-10 | Sony Corporation | Wireless link quality monitoring in network-enabled TVs |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100880568B1 (en) | 2009-01-30 |
| KR20080059866A (en) | 2008-07-01 |
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