EP0831606A2 - Méthode pour la transmission d'un programme audiovisuel, par exemple un programme de télévision, comportant un programme principal et un programme supplémentaire pour une région limitée, et dispositif d'émission et de récepteur pour ladite méthode - Google Patents

Méthode pour la transmission d'un programme audiovisuel, par exemple un programme de télévision, comportant un programme principal et un programme supplémentaire pour une région limitée, et dispositif d'émission et de récepteur pour ladite méthode Download PDF

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Publication number
EP0831606A2
EP0831606A2 EP97114761A EP97114761A EP0831606A2 EP 0831606 A2 EP0831606 A2 EP 0831606A2 EP 97114761 A EP97114761 A EP 97114761A EP 97114761 A EP97114761 A EP 97114761A EP 0831606 A2 EP0831606 A2 EP 0831606A2
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EP
European Patent Office
Prior art keywords
signal
information
control signal
limited information
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97114761A
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German (de)
English (en)
Other versions
EP0831606A3 (fr
Inventor
Manabu Katsuki
Sigemitsu Higuchi
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Hitachi Ltd
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Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0831606A2 publication Critical patent/EP0831606A2/fr
Publication of EP0831606A3 publication Critical patent/EP0831606A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information

Definitions

  • the present invention relates to a method of transmitting a wide-band broadcasting such as a television broadcasting and a transmitting and receiving apparatus therefor, and relates more particularly to a transmission method and a system structure suitable for transmitting and receiving limited information to and in a narrower area than a transmission area.
  • a wide-band broadcasting as represented by a broadcasting of pictures, conventionally the same program has been broadcasted by using a carrier such as radio waves, for example, to all the transmission areas from a broadcasting station. Further, at a receiver side, a picture signal of a television program broadcasted by a carrier such as radio waves is received by a signal receiver and is demodulated so that the picture is reproduced by a picture receiver.
  • a carrier such as radio waves
  • a reference numeral 201 denotes a broadcasting station, 202a and 202b subscribers and 203 a broadcasting area.
  • the broadcasting station 201 transmits program pictures by using radio waves, for example, to the broadcasting area 203.
  • the subscribers 202a and 202b receive the radio waves transmitted by an antenna respectively, demodulate by a picture receiver the picture signal of the program transmitted by the carrier such as radio waves and obtain pictures on the picture receivers.
  • Fig. 8 One example of the structure of transmission facilities in the broadcasting station 201 is shown in Fig. 8 and its operation will be explained below. In Fig.
  • reference numerals 211 denotes a server for storing program pictures to be broadcasted, 212 a transmitter, and 213 a transmission antenna.
  • program pictures are supplied from the server 211 to the transmission facilities 212 according to a predetermined TV program based on a predetermined time schedule, and the program pictures are modulated into a transmission signal and this signal is amplified.
  • the transmission signal is transmitted to the broadcasting area 203 shown in Fig. 7 from the transmission antenna 213.
  • a TV program includes a sports program, a commercial, weather forecast and a movie, for example, as shown in Fig. 9.
  • Program pictures for each program are arranged in time series at predetermined times.
  • FIG. 10 one example of the structure of the receiving facilities at the subscriber 202a side is shown in Fig. 10.
  • reference numerals 231 denotes a receiving antenna, 232 a receiving apparatus and 233 a picture receiver.
  • the subscriber 202a receives with the receiving antenna 231 the radio waves transmitted from the broadcasting station 201, demodulates the received signal into a picture signal by the receiving apparatus 232, and displays the demodulated picture signal of the TV program in pictures by the picture receiver 233.
  • the subscriber 202b also has a similar structure and displays the picture of a TV program in the picture receiver in a similar manner.
  • the subscribers in the broadcasting area 203 can watch TV programs transmitted in time series at the same time by the picture receivers.
  • the above-described structure has been efficient since programs can be broadcasted to a wide broadcasting area with one set of transmission facilities. However, according to the above-described structure, it is considered that sufficient considerations have not been given to the broadcasting of area limited information to the subscribers who are staying in that area.
  • a weather forecast as an example, a predetermined time is allocated to the weather forecast in a TV program. Accordingly, there is a limit to the amount of information on the weather forecast which can be broadcasted within this allocated time. For example, only the weather forecast relating to the whole broadcasting area can be broadcasted. However, when the broadcasting area is widely distributed, there is a case where the weather information is changing depending on the areas where the subscribers are staying.
  • the conventional structure has a problem in that subscribers can not obtain weather information of the areas of the subscribers.
  • the above problem similarly arises in other information such as commercial and traffic information, for example.
  • a main information signal for transmitting program pictures and coded signals of a limited information signal such as commercial information and an area signal for showing an applied area of the limited information signal are multiplexed and that a control signal for starting the display of the above-described limited information signal at a predetermined time is also included in the information signal for transmission.
  • a control signal for ending the display of the above-described limited information signal at a predetermined time is also included in the above-described control signal for transmission.
  • All the plurality of limited information signals before they are coded have the same display time when they are displayed in pictures respectively.
  • Menu screen information is transmitted to enable the subscribers to select easily a limited information signal to be displayed on the picture receiver from the plurality of limited information signals.
  • the main information signal, the limited information signal and the area signal are transmitted by being frequency multiplexed.
  • At least the main information signal and the limited information signal are transmitted by being time-division multiplexed.
  • the transmission time of the coded signals becomes a predetermined time.
  • the transmitting apparatus is structured to include:
  • the receiving apparatus for receiving an information signal such as a picture signal
  • the receiving apparatus is structured to include:
  • the display control signal generating unit includes a unit for generating a display control signal so that a main information signal is displayed after a predetermined period of time since the display control signal generating unit has started a display of a limited information signal.
  • the control signal generating unit includes a memory unit for storing an optional control signal.
  • a telephone line is connected to the control signal generating unit and the control signal generating unit includes a unit for setting a control signal through the telephone line.
  • control signal relating to the display includes menu screen information
  • the display control signal generating unit includes a unit for generating selective screen information for facilitating a selection from the menu screen information
  • control signal generating unit includes a unit for generating a control signal based on the selective screen information
  • a main information signal for transmitting program pictures and a limited information signal for transmitting the coded limited information signal such as commercial information are multiplexed, and an area signal for showing an area to which the limited information signal is applied is coded, and a control signal for displaying the limited information signal at a predetermined time is transmitted. Accordingly, information closely linked to the areas of subscribers can be transmitted, and further, the display of this information can be started at a predetermined time.
  • the display of main information can be started compulsively even if the display of the limited information signal is not finished within a predetermined time period due to an error of a storage medium or the like, for example, at the subscriber side. Therefore, it becomes possible to avoid an occurrence of time loss in program pictures.
  • the areas to which the limited information are applied can be narrowed so that further detailed information can be provided.
  • a subscriber By transmitting menu screen information for selecting a limited information signal to be displayed by a picture receiver from a plurality of limited information signals, a subscriber can easily select a limited information signal of an area different from the limited information signal of a pre-set area. This helps to further increase the convenience of the subscribers.
  • the limited information signals corresponding to many areas can be transmitted during the period while program pictures are being transmitted in the main information signal. This enables a provision of further detailed information.
  • the main information signal and the limited information signals can be transmitted by time-axis muliplexing, so that the limited information signals corresponding to many areas can be transmitted during the period while the program pictures are being transmitted in the main information signal. This enables a provision of further detailed information.
  • the plurality of limited information signals can be transmitted within a time for displaying the limited information signals, so that information closely linked to the areas of the subscribers can be transmitted.
  • a transmitting apparatus for transmitting information signals such as picture signals
  • a main information signal for transmitting program pictures a limited information signal such as a commercial and an area signal are coded and multiplexed
  • a control signal for displaying the limited information signal is also multiplexed for transmission. Therefore, information closely linked to the areas of the subscribers can be transmitted and, at the same time, the display of these information can be started at a predetermined time so that this increases the convenience of the subscribers.
  • the picture signal receiving apparatus extracts the main information signal and the coded signal from a received signal, decodes a signal for showing an applied area of the limited information from the extracted coded signal, stores the coded limited information signal in a limited information storing unit according to the decoded area signal, reads from the limited information storing unit a display control signal from a display control signal generating unit for detecting a control signal relevant to the display of the limited information signal and for controlling the display and a limited information signal selected from a plurality of limited information signals based on a control signal for selecting a limited information to be displayed, and decodes and outputs these information. Therefore, information closely linked to the areas of the subscribers can be displayed during a period of time for displaying the limited information signals, which can help to increase the convenience of the subscribers.
  • a display control signal is generated so that the main information signal is displayed after a predetermined period of time since the display control signal generating unit started the display of a limited information signal, information closely linked to the areas of the subscribers can be displayed during the period while the limited information signal is being displayed. Further, even if an error has occurred in the limited information storing unit, the main information signal can be displayed without displaying the limited information signal again, so that time loss is not generated in the program pictures.
  • control signal generating unit is structured to include a memory unit for storing a desired control signal, a control signal can be automatically set at the time of displaying the limited information signal, so that the subscribers need not set the selection each time.
  • the control signal of the limited information signal can be automatically set, so that the subscribers need not set the selection each time.
  • the display control signal generating unit generates selective screen information from the transmitted menu screen information, and a subscriber selects a limited information based on the selective screen information when necessary so that a control signal is generated from the control signal generating unit accordingly. Therefore, a subscriber can easily select a limited information signal of an area different from the limited information signal of a pre-set area. This helps to further increase the convenience of the subscribers.
  • Fig. 1 is a block diagram for showing a mode of one embodiment of the transmitting apparatus according to the present invention.
  • Fig. 2 is a diagram for showing a mode for implementing signals in the transmitting apparatus of the present invention.
  • Fig. 3 is a diagram for showing another mode for implementing signals in the transmitting apparatus of the present invention.
  • Fig. 4 is a diagram for showing another mode for implementing signals in the transmitting apparatus of the present invention.
  • Fig. 5 is a block diagram for showing a mode of one embodiment of the receiving apparatus according to the present invention.
  • Fig. 6 is a block diagram for showing one embodiment of the control signal generating unit according to the present invention.
  • Fig. 7 is a block diagram for showing the structure of a conventional picture broadcasting.
  • Fig. 8 is a block diagram for showing a mode of one embodiment of a conventional transmitting apparatus.
  • Fig. 9 is a diagram for showing a mode for implementing signals in the conventional transmitting apparatus.
  • Fig. 10 is a block diagram for showing a mode of one embodiment of the conventional receiving apparatus.
  • Fig. 1 is a block diagram for showing one example of the transmitting apparatus according to the present invention.
  • reference numerals 1 denotes a main server for storing main information signals such as program pictures and 2 denotes a sub-server for storing limited information signals such as weather forecast and commercials, for example, in each area and area signals for showing applied areas.
  • the main server 1 and the sub-server 2 which are the information signal storing units are structured by a tape storage unit such as a VTR or a disc storage unit such as a hard disc or an optical disc, or a memory, which are not limited.
  • Reference numerals 3 denotes a coding unit for coding limited information signals and area signals, 4 a control signal generating unit for generating control signals relevant to the display of limited information signals, 5 a multiplexer for multiplexing main information signals and limited information signals, and 6 a transmitter.
  • a coding unit for coding limited information signals and area signals
  • 4 a control signal generating unit for generating control signals relevant to the display of limited information signals
  • 5 a multiplexer for multiplexing main information signals and limited information signals
  • 6 a transmitter. The operation of Fig. 1 will be explained below.
  • program pictures are supplied as a main information signal from the main server 1 to the multiplexer 5.
  • limited information signals and area signals output from the sub-server 2 are supplied to the coding unit 3 and these signals are converted to limited information codes and applied area codes and are then supplied to the multiplexer 5.
  • the control signal generating unit 4 generates a start control signal for starting the display of limited information signals at a predetermined time at the subscribers side, for example, and supplies the start control signal to the multiplexer 5.
  • the multiplexer multiplexes the main information signals from the main server 1, the limited information codes and the applied area codes from the coding unit 3 and the start control signal from the control signal generating unit 4, modulates these signals to generate a transmission signal and outputs this signal to the transmitter 6.
  • the transmitter 6 amplifies the transmission signal from the multiplexer 5 and transmits the applied signal to the subscribers.
  • multiplexing signals by the multiplexer 5 will be explained below with reference to Fig. 2.
  • reference symbols a denotes a main information signal
  • b denotes a signal for showing a limited information code and an applied area code output from the coding unit 3
  • c denotes a multiplexed signal.
  • the main information signal includes program pictures read from the main server 1 according to a predetermined time schedule, and covers in time-series a normal program such as a drama, a nation-wide commercial, a nation-wide weather forecast and a normal program, for example, as shown in Fig. 2a.
  • the coding unit 3 codes the limited information signals and area signals read from the sub-server 2, and outputs a plurality of area codes and limited information codes in time-series as coded signals as shown in Fig. 2b, for example.
  • the multiplexer 5 multiplexes the main information signal and the coded signals by using a frequency multiplexing, for example, and also multiplexes the start control signal from control signal generating unit 4, and generates a transmission signal.
  • the control signal is multiplexed by the multiplexer 5 by outputting a start control signal from the control signal generating unit 4 to the transmitter 6 as a transmission signal at a predetermined time for starting the display of the limited information signal, as an example.
  • a signal as shown in Fig. 2c is obtained.
  • a main information signal for transmitting program pictures, coded information of a limited information signal for transmitting the limited information signal such as commercial information and the area signal for showing the area to which the limited information are applied and a start control signal for starting the display of the limited signal for displaying the limited information signal at a predetermined time can be multiplexed and transmitted. Accordingly, information closely linked to the areas of subscribers can be transmitted, and further, the display of this information can be started at a predetermined time.
  • a signal for showing an applied area of the limited information and a limited information signal corresponding to this signal can be transmitted by a plurality of number in time-series by coding these signals, the areas to which the limited information signal is applied can be narrowed, so that further detailed information can be provided.
  • the time for showing the pre-coded limited information signals in pictures is set all the same, the display of these limited information signals can be finished at the same time even if limited information signals of different areas or different subscribers are selectively displayed. Accordingly, it is possible to avoid an occurrence of a disturbance of program pictures structured by a main information signal depending on areas and subscribers.
  • the main information signal and the coded limited information signals are transmitted by frequency-multiplexing these signals, limited information signals corresponding to many areas can be transmitted during the period while program pictures are being transmitted in the main information signal, so that further detailed information can be provided.
  • frequency multiplexing is applied for the multiplexer 5 to multiplex the main information signal and the coded limited information signals.
  • the present invention is not limited to this, and these signals can also be multiplexed by time-division as shown below, for example.
  • Signals which have been multiplexed by time-division are shown in Fig. 3.
  • reference symbols a denotes a main information signal
  • c denotes a coded signal in which limited information signals and area signals are coded
  • b denotes a transmission signal.
  • FIG. 3a shows program pictures read from the main server 1 according to a predetermined time schedule, and covers in time-series a normal program such as a drama, a nation-wide commercial, a nation-wide weather forecast and a normal program, for example, as shown in Fig. 2a.
  • the coded signal in Fig. 3c also covers in time-series a plurality of applied area codes and limited information codes which are the limited information signals and the area signals read from the sub-server 2 and then coded, similar to those in Fig. 2b.
  • the plurality of limited information signals read from the sub-server 2 are set such that their display time in pictures is all the same.
  • the multiplexer 5 at first time-axis compresses the main information signal at a predetermined time interval.
  • the multiplexer 5 also time-axis compresses the coded signal at a predetermined time interval.
  • the multiplexer 5 then multiplexes in time-division the time-axis compressed main information signal and coded signal respectively, and further multiplexes in time-division the start control signal, for example, from the control signal generating unit 4, so that a time-division multiplexed transmission signal shown in Fig. 3b is generated.
  • limited information signals corresponding to many areas can also be transmitted during the period while a program is being transmitted in the main information signal, so that further detailed information can be provided.
  • the limited information signals and the area signals are transmitted in codes during the transmission of a normal program in the main information signal.
  • the present invention is not limited to this.
  • a plurality of limited information signals and applied areas may also be coded and transmitted during a period while the limited information signals are being displayed.
  • One example of the structure of signals in this case is shown in Fig. 4. Referring to Fig. 4, reference symbols a denotes a main information signal, c denotes a coded signal in which limited information signals and area signals are coded, and b denotes a transmission signal.
  • FIG. 4a shows program pictures read from the main server 1 according to a predetermined time schedule, and covers a normal program such as a drama, for example, as shown.
  • a non-signal period of a predetermined time period is set for the period when limited information signals are multiplexed.
  • the coded signal in Fig. 4c also covers in time-series a plurality of applied area codes and limited information codes which are the limited information signals and the area signals read from the sub-server 2 and then coded, similar to those in Fig. 2a.
  • the plurality of limited information signals read from the sub-server 2 are set such that their display time in pictures is all the same.
  • the multiplexer 5 multiplexes the plurality of area codes in the coded signal and codes of the limited information signals and inserts the multiplexed codes into the non-signal period of the predetermined period of time of the main information signal. Further, the multiplexer 5 multiplexes the start control sinal from the control signal generating unit 4 and thereby generates a transmission signal which is a time-division multiplexed signal of the main information signal and the coded signal.
  • a time-division multiplexing or a frequency multiplexing is used, for example.
  • limited information signals corresponding to many areas can also be transmitted during the period while a program is being transmitted in the main information signal, so that further detailed information can be provided.
  • the control signal for multiplexing by the multiplexer 5 is explained by only the start control signal from the control signal generating unit 4.
  • the present invention is not limited to this.
  • the subscribers can easily select the limited information signal, which further increases the convenience of the subscribers.
  • the start control signal from the control signal generating unit 4 or not only the start control signal but also the menu screen information for selecting a limited information signal are multiplexed by the multiplexer 5 and transmitted.
  • the display of main information can be started compulsively even if the display of a limited information signal does not end within a predetermined time period from the display starting time due to an error of a storage medium at a subscriber side, for example.
  • an occurrence of time loss in the program pictures in the main information can be avoided.
  • a control signal is multiplexed with the time for starting the display of limited information and then the signal is transmitted.
  • the present invention is not limited to this, but the control signal may also be transmitted by the time when the limited information is started by multiplexing the control signal with a coded signal, for example.
  • limited information can also be displayed at a predetermined time by receiving the control signal at a subscriber side.
  • FIG. 5 an embodiment of the structure of the receiving apparatus for receiving picture signals transmitted from the transmitting apparatus of the above-described embodiment is shown in Fig. 5.
  • reference numerals 11 denotes an extracting unit, 12 a decoding unit for decoding an applied area code, 13 a storage unit for storing limited information, 14 a control signal generating unit for generating a control signal of display information, 15 a decoding unit for decoding a limited information code, 16 a display control signal generating unit for displaying limited information, and 17 a change-over unit for changing over an output signal.
  • the extracting unit 11 extracts a main information and a coded signal from a signal received by a receiving antenna or the like not shown.
  • the extracted main information signal is supplied to the output change-over unit 17, and is output to the receiver not shown from the output change-over unit 17 during a transmission of a normal program.
  • a coded signal extracted from the received signal is output to the applied area decoding unit 12 and the limited information storage unit 13.
  • the applied area decoding unit 12 extracts an applied area code from a coded signal, decodes this code to generate an area signal and then outputs this area signal to the limited information storage unit 13.
  • the limited information storage unit 13 stores a limited information code in a storage medium based on an area signal supplied.
  • the display control signal generating unit 16 detects a control signal for starting the display and a control signal for ending the display, for example, from a received signal, generates a display starting signal and a display ending signal based on these signals and supplies the generated signals to the limited information storage unit 13 and the output change-over unit 17.
  • the control signal generating unit 14 generates a control signal for selecting a limited information signal to be displayed and supplies the signal to the limited information storage unit 13.
  • the control signal generating unit 14 is structured to include a memory, for example, for storing an optional control signal set by a remote controller or the like in this memory, and generates each time a control signal for selecting a limited information signal corresponding to the code for showing an area of subscribers.
  • the limited information storage unit 13 reads a corresponding limited information code from a storage medium based on a control signal from the control signal generating unit 14, and outputs the limited information code to the limited information signal decoding unit 15.
  • the limited information signal decoding unit 15 decodes the limited information code and supplies a limited information to the output change-over unit 17.
  • the output change-over unit 17 changes over the output signal from the main information signal to the limited information signal based on the display starting signal from the display control signal generating unit 16.
  • the limited information storage unit 13 ends the reading of the limited information code from the storage medium based on the display ending signal from the display control signal generating unit 16, and the output change-over unit 17 changes over the signal to be output from the limited information signal to the main information signal.
  • the display control signal generating unit 16 detects a control signal for starting a display and a control signal for ending the display from a received signal and then generates a display starting signal and a display ending signal.
  • the present invention is not limited to this, but only the control signal for starting the display may be detected, for example.
  • the object of the present invention can also be met when the display control signal generating unit 16 generates a display starting signal based on the control signal for starting the display and a display ending signal after a predetermined time period since the display starting signal was generated, for example.
  • the display control signal generating unit 16 generates a display starting signal based on the control signal for starting the display and a display ending signal after a predetermined time period since the display starting signal was generated, for example.
  • a control signal for selecting a limited information signal to be generated by the control signal generating unit 14 is set by a remote controller or the like.
  • the present invention is not limited to this, but the control signal can also be set through a telephone line as shown by a block diagram in Fig. 6, for example.
  • reference numerals 20 denotes a telephone set, 21 a memory, 22 an initialization detecting unit, and 23 a telephone line.
  • information for setting is sent from a transmitter side such as a broadcasting station not shown, for example, through the telephone line 23.
  • the initialization detecting unit 22 decides an applied area of a limited information for a subscriber based on the information for setting, and initializes the memory for the control signal for selecting a limited information signal. With this operation, the initialization of the control signal for a limited information signal can be automated so that the subscribers can save the setting work.
  • control signal generating unit 14 generates a control signal for a limited information signal so as to select a limited information signal corresponding to the area of a subscriber each time.
  • the present invention is not limited to this, but the control signal may also be generated by a subscriber's selection from the menu screen information transmitted when necessary, for example.
  • the operation of the display control signal generating unit 16 and the control signal generating unit 14 in this case will be explained by using Fig. 5.
  • the display control signal generating unit 16 detects menu screen information from a received signal, generates selective screen information and outputs this information to the control signal generating unit 14.
  • the control signal generating unit 14 generates a control signal for the area which the subscriber has selected from the selective screen information and supplies this control signal to the limited information storage unit 13.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Circuits Of Receivers In General (AREA)
EP97114761A 1996-09-02 1997-08-26 Méthode pour la transmission d'un programme audiovisuel, par exemple un programme de télévision, comportant un programme principal et un programme supplémentaire pour une région limitée, et dispositif d'émission et de récepteur pour ladite méthode Withdrawn EP0831606A3 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP231655/96 1996-09-02
JP8231655A JPH1079924A (ja) 1996-09-02 1996-09-02 情報信号の伝送方法および送信装置ならびに受信装置
JP23165596 1996-09-02

Publications (2)

Publication Number Publication Date
EP0831606A2 true EP0831606A2 (fr) 1998-03-25
EP0831606A3 EP0831606A3 (fr) 2004-01-21

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EP97114761A Withdrawn EP0831606A3 (fr) 1996-09-02 1997-08-26 Méthode pour la transmission d'un programme audiovisuel, par exemple un programme de télévision, comportant un programme principal et un programme supplémentaire pour une région limitée, et dispositif d'émission et de récepteur pour ladite méthode

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EP (1) EP0831606A3 (fr)
JP (1) JPH1079924A (fr)

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JP4620878B2 (ja) 2001-01-22 2011-01-26 株式会社日立製作所 放送方法及び放送受信装置
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JP2017076853A (ja) * 2015-10-14 2017-04-20 住友電工システムソリューション株式会社 送信装置、受信装置、端末装置およびサーバ

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EP1158707A1 (fr) * 2000-05-25 2001-11-28 Lucent Technologies Inc. Méthode et dispositif pour la transmission d'émissions
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US8023883B1 (en) 2005-12-28 2011-09-20 The Directv Group, Inc. Method and apparatus for controlling handoffs in a mobile system
US9316738B2 (en) 2005-12-28 2016-04-19 The Directv Group, Inc. Method and apparatus for controlling a mobile device beyond an area of interest boundary
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