Note: Descriptions are shown in the official language in which they were submitted.
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TRANSMITTING AND RECEIVING METHOD AND
APPARATUS FOR DIGITAL TELEVISION BROADCASTING
DATA
Technical Field
[2] Apparatuses and methods consistent with the present invention relate to
digital
television broadcasting, and more particularly, to digital television
broadcasting which
reduces power consumption by selectively turning off frame receiving while an
undesired service
is transmitted.
Background Art
[3] According to the old paradigm, a television broadcast is watched from a
fixed
position. However, such a paradigm is currently changing, i.e., a user can
watch a television
broadcast anywhere at any time. In order to adjust to the change in the way an
audience watches
a television broadcast, businesses and manufacturers are trying to produce
standards and
terminals suitable for a mobile environment.
[4] Such standards and terminals should be designed by considering a specific
mobile
environment. That is, a mobile terminal provides a service to a user by using
a limited battery
resource. Therefore, while providing a service according to regulations, the
standards and
terminals should be designed to provide a service using the minimum battery
resources.
Disclosure of Invention
Technical Problem
[5] In order to reduce power consumption of the terminals, there is a need in
the
technology to turn off the power of a radio frequency (RF) device while
service that is not
selected by a user is being transmitted.
Technical Solution
[6] The present invention provides a method and apparatus for transmitting
digital
television broadcasting data to reduce power consumption by selectively
turning off a frame
receiving apparatus while a service that is not desired by a user is
transmitted, and a computer
readable recording medium having embodied thereon a computer program for
executing the
method of transmitting digital television broadcasting data.
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[71 The present invention also provides a method and apparatus for
receiving digital
television broadcasting data to reduce power consumption by selectively
turning off a
frame receiving apparatus while a service that is not desired by a user is
transmitted,
and a computer readable recording medium having embodied thereon a computer
program for executing the method of receiving digital television broadcasting.
Advantageous Effects
[81 In a method and apparatus for transmitting digital television
broadcasting data and a
method and apparatus for receiving digital television broadcasting data
according to
exemplary embodiments of the present invention, service frame groups including
all
service frames are generated and the frame number for each service frame is
designated so that the RF receiving unit operates while receiving the service
frames
corresponding to a desired service and the power of the RF receiving unit is
turned off
while receiving the service frames corresponding to an undesired service are
transmitted, thereby saving power. In addition, the power of the RF device is
con-
tinuously turned off during various frames so that the RF device can have a
rest for a
longer period of time and thus power saving efficiency is excellent.
Accordingly, the
terminal can be operated for a longer period of time.
Description of Drawings
[91 The above and other aspects of the present invention will become more
apparent by
describing in detail exemplary embodiments thereof with reference to the
attached
drawings in which:
[10] FIG. 1 is a diagram of a related art Advanced Television Systems
Committee
(ATSC) channel system;
[11] FIG. 2 is a diagram of an ATSC channel system improved according to an
exemplary
embodiment of the present invention;
[12] FIG. 3 is a diagram of service frame groups according to an exemplary
embodiment
of the present invention;
[13] FIG. 4 is a block diagram of an apparatus for transmitting digital
television
broadcasting data according to an exemplary embodiment of the present
invention;
[14] FIG. 5 is a block diagram of an apparatus for receiving digital
television broadcasting
data according to an exemplary embodiment of the present invention;
[15] FIG. 6 is a block diagram of an apparatus for transmitting digital
television
broadcasting data according to another exemplary embodiment of the present
invention;
[16] FIG. 7 is a block diagram of an apparatus for receiving digital
television broadcasting
data according to another exemplary embodiment of the present invention;
[17] FIG. 8 is a flowchart of a method of receiving digital television
broadcasting data
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according to another exemplary embodiment of the present invention;
[18] FIG. 9 is a diagram of a protocol stack of an Advanced-Vestigial Side
Band (A-VSB)
system;
[19] FIG. 10 shows an example in which a method of transmitting data
according to an
exemplary embodiment of the present invention is applied to the A-VSB system
of
FIG. 9;
[20] FIG. 11 is a diagram of a format of SIC according to an exemplary
embodiment of
the present invention;
[21] FIG. 12 shows the format of the SIC of FIG. 11 in more detail
according to an
exemplary embodiment of the present invention;
[22] FIG. 13 shows contents of frame group information according to an
exemplary em-
bodiment of the present invention;
[23] FIG. 14 shows version indicator information according to an exemplary
em-
bodiment of the present invention;
[24] FIG. 15 shows additional service information according to an exemplary
em-
bodiment of the present invention; and
[25] FIG. 16 shows turbo channel information according to an exemplary
embodiment of
the present invention.
Best Mode
[26] According to an aspect of the present invention, there is provided a
method of
transmitting digital television broadcasting data, the method including:
generating or
allocating at least one service frame with respect to respective services
included in a
channel, designating a frame number for the at least one generated or
allocated service
frame; generating a service frame group including all service frames for which
the
frame number is designated, and transmitting the service frame group.
[27] In the designating of the frame number, a frame number 1 may be
designated to a
first service frame in the service frame group and the frame number is
incremented by
1 for the next service frame.
[28] The generating of the service frame groups may include: generating
service con-
figuration information for the service frame group, and adding the service con-
figuration information to the at least one generated or allocated service
frame, wherein
the service configuration information indicates to which service of the
channel each
service frame corresponds.
[29] According to another aspect of the present invention, there is
provided an apparatus
for transmitting digital television broadcasting data, the apparatus
including: a service
frame generating unit which generates or allocates at least one service frame
with
respect to respective services included in a channel, a frame number
determining unit
which designates a frame number for the at least one generated or allocated
service
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frame, a service frame group generating unit which generates a service frame
group
including all service frames for which the frame number is designated, and a
transmitting unit which transmits the service frame group.
[30] According to another aspect of the present invention, there is
provided a method of
receiving digital television broadcasting data, the method including:
analyzing service
configuration information for a service frame group, determining a frame
number of at
least one service frame that corresponds to a desired service based on the
analyzed
service configuration information, receiving the at least one service frame
having the
determined frame number from among the service frames included in the service
frame
group, and turning off the power of a radio frequency (RF) device to receive a
service
frame while service frames which do not have the determined frame number are
transmitted.
[31] In the frame number of the service frames, a frame number 1 may be
designated to a
first service frame in the service frame group and the frame number is
incremented by
1 for the next service frame.
[32] The service configuration information may indicate to which service of
the channel
each service frame corresponds.
[33] The turning off the power of the RF device may include: determining a
number of
service frames that do not correspond to the desired service from among the
service
frames included in the service frame group, determining a time to turn off the
power of
the RF device by multiplying a length of a single service frame by the
determined
number of the service frames, and receiving the last service frame from among
the
service frames corresponding to the desired service and turning off the power
of the RF
device during the determined time.
[34] According to another aspect of the present invention, there is
provided an apparatus
for receiving digital television broadcasting data, the apparatus including: a
service
configuration information interpreting unit which analyzes service
configuration in-
formation for a service frame group and determined a frame number of at least
one
service frame that corresponds to a desired service based on the analyzed
service con-
figuration information, a radio frequency (RF) receiving unit which receives
the
service frame having the determined frame number from among the service frames
included in the service frame group, and an RF power control unit which turns
off the
power of the RF receiving unit while service frames which do not have the
determined
frame number are transmitted.
[35] In the frame number of the service frames, a frame number 1 may be
designated to a
first service frame in the service frame group and the frame number is
incremented by
1 for the next service frame.
[36] The service configuration information may indicate to which service of
the channel
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each service frame corresponds.
[37] The RF power control unit may include: an off-time determining unit
which de-
termines a number of service frames that do not correspond to the desired
service from
among the service frames included in the service frame group and determine a
time to
turn off the power of the RF receiving unit by multiplying a length of a
single frame by
the number of the service frames, and an off-time timer unit which receives
the last
service frame from among the service frames corresponding to the desired
service and
turns off the power of the RF receiving unit during the determined time.
Mode for Invention
[38] Hereinafter, the present invention will be described more fully with
reference to the
accompanying drawings, in which exemplary embodiments of the invention are
shown.
[39] FIG. 1 is a diagram of a related art Advanced Television Systems
Committee
(ATSC) channel system. The ATSC is a committee established to develop an
Advanced Television (ATV) method that should be the next generation
terrestrial
television in the United States. The ATSC channel system is a technical
standard of the
next generation digital terrestrial television method in the United States.
[40] Referring to FIG. 1, channel 1 (CH 1, 10) and channel 2 (CH 2, 12) are
interleaved in
frames 14. That is, data of these channels is spread out in radio frequency
(RF) frames.
Therefore, there is no way to control the power of an RF device selectively
for a
specific service provided by a channel.
[41] FIG. 2 is a diagram of an ATSC channel system improved according to an
exemplary
embodiment of the present invention.
[42] Referring to FIG. 2, in the system according to this exemplary
embodiment of the
present invention, channel 1 (CH 1, 20 and 24) and channel 2 (CH 2, 22) are
divided
into each frame to be transmitted. In FIG. 2, channel 1 (20 and 24) is
transmitted by
using frames 30 and 34 and channel 2 (22) is transmitted by using frames 32.
Ac-
cordingly, if a desired service from a receiving apparatus corresponds to
channel 1, the
frames 32 which are the frames corresponding to channel 2 are not received and
thus
power consumption of the RF device can be reduced.
[43] FIG. 3 is a diagram of service frame groups according to an exemplary
embodiment
of the present invention.
[44] In the present exemplary embodiment, the power consumption of the
receiving
apparatus can be reduced by using such service frame groups.
[45] In FIG. 3, three services 40 including service 1 through service 3 are
included in a
channel.
[46] In a method of transmitting digital television broadcasting data
according to the
present exemplary embodiment, a service frame group 50 including all services
to be
transmitted is generated. Each service corresponds to at least one RF frame
54. The RF
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frame that corresponds to each service is referred to as a service frame.
[47] In FIG. 3, service 1 corresponds to service frames 1 through 4,
service 2 corresponds
to service frames 5 through 8, and service 3 corresponds to service frames 9
through
12, as shown by the service configuration information 52.
[48] FIG. 3 illustrates that service 1 is received from a reception side.
[49] According to a receiving apparatus operation period 60, the receiving
apparatus
should receive the service frames 1 through 4 that correspond to service 1.
Thus, while
the service frames 5 through 12 are transmitted, the receiving apparatus is
turned off.
In this exemplary embodiment, the RF device included in the receiving
apparatus is
turned off.
[50] After the service frames 1 through 12 are transmitted, a next service
frame group is
transmitted. When service frame 1 included in a new service frame group is
transmitted, the power is supplied to the RF device of the receiving apparatus
so that
service frames can be received. Thus, the time to turn off the RF device is
previously
determined so as to turn off the power of the RF device during the determined
off time.
[51] In order to previously determine the time to turn off the RF device,
service con-
figuration information is generated and transmitted from a transmission device
to the
receiving apparatus. The service configuration information indicates
correspondence
information between services rendered and channel frames. In other words, the
service
configuration information indicates to which service of the channel, each
service frame
corresponds. Using the service configuration information, the reception side
may know
that service 1 corresponds to the service frames 1 through 4 from among all
service
frames. Since all service frames comprise service frames 1 through 12, service
frames
through 12 correspond to the time to turn off the RF device. Accordingly, the
time to
turn off the RF device may be determined by Equation 1 shown below. According
to
circumstances, the time to turn off may be reduced by a. That is, when the RF
device
needs the preparation time to receive an RF stream or if the clock of a
terminal is not
accurate so that an error exists, an operation that is earlier than the
predetermined off
time may be needed. Such a preparation time is represented as a.
[52] [Equation 1]
[53] Off time of the RF device = (number of all service frames included in
a service frame
group - number of service frames corresponding to desired service) * length of
a single
frame - a
[54] FIG. 4 is a block diagram of an apparatus for transmitting digital
television
broadcasting data according to an exemplary embodiment of the present
invention.
[55] Referring to FIG. 4, the apparatus for transmitting digital television
broadcasting data
400 includes a service frame generating unit 410, a frame number determining
unit
420, a service frame group generating unit 430, and a transmitting unit 450.
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[56] The service frame generating unit 410 generates at least one service
frame with
respect to each service included in a channel.
[57] The frame number determining unit 420 determines frame numbers with
respect to
the generated service frames.
[58] The service frame group generating unit 430 generates service frame
groups
including all service frames generated by the service frame generating unit
410. The
service frame group generating unit 430 may further include a service
configuration in-
formation generating unit 440 which generates service configuration
information to be
added to each service frame. The service configuration information indicates
to which
service of the channel, each service frame included in the service frame
groups cor-
responds.
[59] The transmitting unit 450 transmits the service frame groups.
[60] As an example, the frame number determining unit 420 determines the
frame number
1 for the first service frame in the service frame group and determines the
number for
the next service frame by increasing the frame number by 1.
[61] FIG. 5 is a block diagram of an apparatus for receiving digital
television broadcasting
data according to an exemplary embodiment of the present invention.
[62] Referring to FIG. 5, the apparatus for receiving digital television
broadcasting data
500 includes a service configuration information interpreting unit 510, an RF
receiving
unit 520, and an RF power control unit 530.
[63] The service configuration information interpreting unit 510 interprets
the service
configuration information for the service frame groups and obtains at least
one frame
number of the service frames that correspond to a desired service.
[64] The RF receiving unit 520 receives the service frames having the frame
number
obtained from the service configuration information interpreting unit 510 from
among
the service frames included in the service frame groups.
[65] While service frames which do not have the frame number obtained from
the service
configuration information interpreting unit 510 are transmitted, the RF power
control
unit 530 turns off the power of the RF receiving unit 520. Accordingly, the
service
frame that corresponds to an undesired service is not received and the power
con-
sumption of the RF receiving unit 520 can be reduced.
[66] In FIG. 5, the RF power control unit 530 includes an off-time
calculating unit 540
and an off-time timer unit 550.
[67] The off-time calculating unit 540 obtains the number of the service
frames which do
not correspond to the desired service from among the service frames included
in the
service frame groups, multiplies a length of a single frame by the number of
the service
frames, and calculates the time to turn off the power of the RF receiving unit
520. This
is same with the time to turn off the RF device as given by Equation 1.
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[68] The off-time timer unit 550 receives the last service frame from among
the service
frames corresponding to the desired service and turns off the power of the RF
receiving
unit 520 during the time to turn off the RF device determined by the off-time
cal-
culating unit 540. Accordingly, after the service frames corresponding to the
desired
service are all received, the power of the RF receiving unit 520 is turned off
and the
time according to Equation 1 elapses, and the power of the RF receiving unit
520 is
turned on again so that the service frames corresponding to the desired
service are
received.
[69] FIG. 6 is a block diagram of an apparatus for transmitting digital
television
broadcasting data according to another exemplary embodiment of the present
invention.
[70] Referring to FIG. 6, the apparatus for transmitting digital television
broadcasting data
includes service components 100-1 and 100-2, packetizers 110-1 and 110-2, mul-
tiplexers 120-1 and 120-2, a frame generator 130, an emitter 140, and a frame
slicing
information inserter 150.
[71] The service component 100-1 generates an elementary stream (ES) which
forms each
service. For example, if the service is an A/V service, the component
corresponds to an
audio component/video component.
[72] The packetizer 110-1 forms each of the ES as a packet. For example,
the ES is
reformed as a transport stream (TS) packet.
[73] The multiplexer 120-1 multiplexes each of the packets. In the case of
the TS, each of
the packets is manufactured as one TS.
[74] The frame generator 130 generates frames based on the received
multiplexed
packets. In the case of an ATSC standard, an interleaving process is performed
in order
to generate the final frame.
[75] The emitter 140 emits the generated frames by using RF.
[76] The frame slicing information inserter 150 inserts information for
frame slicing into
the packet. The information for frame slicing is, for example, information
including
frame numbering information and a table for frame slicing.
[77] FIG. 7 is a block diagram of an apparatus for receiving digital
television broadcasting
data according to another exemplary embodiment of the present invention.
[78] Referring to FIG. 7, the apparatus for receiving digital television
broadcasting data
includes an RF receiving apparatus 200, a frame skipper 210, a demultiplexer
220, a
depacketizer 230, a service processor 240, a system information processor 250,
and a
control device 260.
[79] The RF receiving apparatus 200 receives RF data.
[80] The frame skipper 210 skips the frame corresponding to a service that
is not selected
by a user.
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[811 The multiplexer 220 receives data of the frame and classifies the data
into each
packet stream.
[82] The depacketizer 230 analyzes the packet according to packet header
information and
transmits the data to an available decoder.
[83] The service processor 240 is one of ES decoders and provides a service
available to a
user by decoding the data received from the depacketizer 230. In this
exemplary em-
bodiment, the service processor 240 is an ES decoder.
[84] The system information processor 250 receives system information and
transmits the
information to the control device 260. Examples of the system information
include
frame slicing information and so on.
[85] The control device 260 receives frame slicing information so as to
skip the frame or
to control the RF device to not be operated for a certain period of time.
[86] FIG. 8 is a flowchart of a method of receiving digital television
broadcasting data
according to another exemplary embodiment of the present invention.
[87] In FIG. 8, a process performed by an RF terminal is not illustrated.
Instead, a process
of receiving an RF frame and the receiving apparatus producing available
packet data
is illustrated.
[88] First, data is received in operation S100 and whether service
configuration in-
formation is included in the data is determined in operation S110. If existing
service
configuration information does not exist and the received data is not the
service con-
figuration information, data is received until the service configuration
information is
received.
[89] If the service configuration information is included in the received
data, whether such
information is updated compared with the existing forming information is
determined
in operation S120. If the service configuration information is updated, the
service con-
figuration information is analyzed so as to reflect only information that is
needed in
operation S130.
[90] The frame number determined for the service frame is identified in
operation S140
and whether the service frame corresponds to the desired service is determined
in
operation S150.
[91] If the service frame includes the desired service, service data is
output in operation
S160. In operation S170, whether a service completion command exists is
determined
and the above process is repeatedly performed until a service completion
command is
determined to exist.
[92] If the service frame does not include the desired service, the service
frame is skipped
in operation S180 and the RF device cannot be operated for a certain period of
time.
[93] In order to do so, the power of the RF device is turned off and a
timer is set in
operation S190. The set time of the timer is the off time according to
Equation 1.
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[94] Whether the timer reaches the set time is identified in operation
S200. If the timer
has not reached the set time, time must be allowed to elapse until the timer
reaches the
set time in operation S210.
[95] When the timer has reached the set time, the power of the RF device is
turned on and
the above process is repeatedly performed.
[96] FIG. 9 is a diagram of a protocol stack of an Advanced-Vestigial Side
Band (A-VSB)
system. The A-VSB system supports a Supplementary Reference System (SRS) and a
turbo application. An SRS 300 includes and transmits a training sequence
called an
equalizer 302 which can increase a reception performance of a terminal.
[97] A turbo application 310 provides a channel which can transmit
additional data.
[98] The data of a turbo application 310 is stored in a private data region
of an adaptation
field (AF) 325 in an ATSC normal TS 320. Information on the SRS 300 and the
turbo
application 310 is transmitted (as shown by arrow 340) through mode
information 332
in the data field sync (DFS) 330. Two DFSs 330 exist in an ATSC transmission
frame.
The mode information is referred to as information transmitted through the DFS
330.
[99] A part where the turbo application data is transmitted is divided into
a signaling in-
formation channel (SIC) 312 and data channels 314. Each data channel 314 is
divided
into sub channels. Information on the sub channels is provided through the SIC
312.
[100] FIG. 10 shows an example in which a method of transmitting data
according to an
exemplary embodiment of the present invention is applied to the A-VSB system
of
FIG. 9.
[101] Referring to FIG. 10, each A-VSB frame 70 corresponds to the service
frame, the
SIC corresponds to the service configuration information, and sliced frames
which
correspond to the services.
[102] Referring to the example of FIG. 10, contents 80 of the service
configuration in-
formation (SIC) will now be described.
[103] The frame number of the corresponding frame is 25. The number of all
frames is
indicated by using the frame number of the last frame in the service frame
group and is
42.
[104] A channel includes two services. One service has a coding rate that
is 1/2. Here, the
number of a start frame is 1 and the length of all frames is 21. Thus, the
service frames
from the frame numbers 1 to 21 correspond to a first service.
[105] The other service has a coding rate that is 1/4. Here, the number of
a start frame is 22
and the length of all frames is 21. Thus, the service frames from the frame
numbers 22
to 42 correspond to a second service.
[106] FIG. 11 is a diagram of a format of SIC according to an exemplary
embodiment of
the present invention.
[107] Referring to FIG. 11, the SIC according to an exemplary embodiment of
the present
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invention includes version indicator information, frame group information,
turbo
channel information, additional service information, padding, flags indicating
the
existence of these information, and a cyclic redundancy check (CRC).
[108] FIG. 12 shows the format of FIG. 11 in more detail.
[109] ServiceConfigurationInformation (SCI) is the smallest unit that is
included in the
SIC. Only one SCI is included in the SIC of one frame.
[110] In each flag set, turbo channel information flag, ad-
ditional service information flag, and padding flag exist.
[111] The turbo channel information flag indicates the existence of turbo
channel information().
[112] The additional service information flag indicates the existence of ad-
ditional service information().
[113] The padding flag indicates the existence of a region of padding.
[114] The frame group information will be described more fully below with
reference to
FIG. 13.
[115] The version indicator information will be described more fully later
with reference
to FIG. 14.
[116] The Turbo channel information() will be described more fully later
with reference
to FIG. 16.
[117] An AdditionalServiceDescriptor will be described more fully later
with reference to
FIG. 15.
[118] A CRC shows an error detection method of the SCI.
[119] FIG. 13 shows contents of frame group information.
[120] A current frame number indicates a current service frame number.
[121] A total frame number indicates the total number of all service frames
included in
the service frame groups.
[122] Since the A-VSB is a single carrier system, RF frames are provided as
an elementary
configuration unit that provides a service to support burst transmission. The
RF frame
is formed of serial lines. Thus, a service allocation method in the frame
cannot be used
and the RF frames should be divided into divisible groups. Frame grouping is a
method
of dividing the serial lines of the RF frames into divisible groups.
[123] Examples of frame grouping may include combining a start frame flag
and an end
frame flag (method 1), including a start frame flag and length information
(method 2),
and designating the frame number (method 3).
[124] In methods 1 and 2, when the middle frame is received, where the
received frame is
located from among all frame groups is not known. In addition, when the size
of the
frame group is changed, it is hardly detected. Method 3 may be used when no
such
problems as described above exist.
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[125] A start of the frame group is designated from frame number 1. Also,
after the largest
frame number is reached, the number is designated again to frame number 1.
This is
called wrap up.
[126] The size of the frame group and the length of each service frame can
be changed by a
signaling procedure in the system. If there is a change in the size of the
frame group, a
point of time for a service to be repeated can be adjusted. For example, if
the size of
the frame group is 10 at the point of time when the service starts, 10 frames
are needed
from the point of time when the first service frame of any service starts to
the point of
time when the first service frame of the service corresponding to the next
service frame
group starts. However, if the system information is updated and thus the size
of the
frame group becomes 20, 20 frames are needed from the point of time when the
first
service frame of the corresponding service starts to the point of time when
the first
service frame of the service corresponding to next service frame group is
received.
[127] Similarly, if there is a change in the length of the service frame, a
point of time for
the service to be repeated can be adjusted. The change in the length of the
service
frame may affect the length of the service frame group. However, according to
a
method of reducing the length of other service frame, the length of the
current service
frame may not be changed.
[128] Accordingly, a section to turn off the power of the RF device can be
controlled.
[129] FIG. 14 shows version indicator information.
[130] Version indicator information includes information on whether service
con-
figuaration information is updated and information indicating when the
updating will
be accomplished.
[131] Resolution flag indicates a unit of a frame counter.
[132] As an example, if the value of resolution flag is 1, the frame
counter is a 20 frame
unit and if the value of resolution flag is 0, the frame counter is a 1 frame
unit.
[133] Frame counter indicates the point of time at which updating is to be
accomplished as
a 1 frame unit or 20 frame unit. The accurate unit changes occur according to
the value
of resolution flag.
[134] A version increases a value by 1 each time when service configuration
information is
updated.
[135] FIG. 15 shows additional service information.
[136] Additional service information is used to transmit additional service
information, in
addition to channel description information.
[137] Additional service information can be divided into various blocks.
[138] Current index represents an index of a current block of a descriptor.
[139] Last index represents an index of a last block of a descriptor.
[140] Length represents a length of a current block.
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[1411 User data represents real description data.
[142] FIG. 16 shows turbo channel information.
[1431 Turbo channel information represent configuration information of each
channel
when data of a turbo application is divided into various channels to be
transmitted.
1144] Version represents a version of turbo channel information and the value
thereof
increases by 1.
[145] Turbo channel number represents the number of total turbo channels.
[146] Turbo channel ID is information to divide each turbo channel.
[147] Turbo fragment bits expresses a length of a turbo channel as an index
value.
[148] Coding rates represents coding rates of a turbo channel.
[149] SD VFG flag informs whether SD VFG (Service Division in a Variable Frame
Group)
is applied in a turbo channel. When SD VFG flag is set, SD VFG is applied.
[150] SD VFG is a technique for dividing a turbo channel into an arbitrary
number of frame
units and transmitting data, that is, transmitting data by the method
suggested in an exemplary
embodiment of the present invention.
[151] Turbo channel index represents the order of a turbo channel.
[152] Current frame number represents the number of start frames of a
corresponding
service.
[153] Frame block number represents the number of frames that form a
corresponding
service.
[154] As described above, in the exemplary embodiments of the present
invention, regardless
of whether a service can be formed independently in a frame, a system which
can turn on/off the
power of the RF device of a user terminal is provided. Accordingly, the
terminal can be
operated longer than a related art terminal. In addition, the power of the RF
device is
continuously turned off during various frames so that the RF device can rest
for a longer period
of time and thus power saving efficiency is excellent.
[155] The exemplary embodiments of the present invention can also be embodied
as computer
readable codes on a computer readable recording medium. The computer readable
recording
medium is any data storage device that can store data which can be thereafter
read by a
computer system. Examples of the computer readable recording medium include
read-only
memory (ROM), random-access memory (RAM), CDROMs, magnetic tapes, floppy
disks, and
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optical data storage devices.
[156]
While the present invention has been particularly shown and described with
reference
to exemplary embodiments thereof, it will be understood by those of ordinary
skill in the art that
various changes in form and details may be made therein without departing from
the scope of the
present invention. The scope of protection being sought is defined by the
following claims rather
than the described embodiments in the foregoing description. The scope of the
claims should not
be limited by the embodiments set forth in the examples, but should be given
the broadest
interpretation consistent with the description as a whole.
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