Method for transmitting near video on demand (NVoD) using catch and rest (CAR) and sub-channels
View Patent ↗The present invention discloses a method for transmitting Near Video on Demand (NVoD) using Catch and Rest (CAR) and sub-channels which includes: dividing an L-sized content into N segments using the CAR broadcasting scheme, allocating the segments to K channels including a replicate channel, and broadcasting the segments; dividing a first segment S 1 R (S i R represents an i-th segment of a regular channel) into N sb sub-segments again at given bandwidth using the harmonic broadcasting scheme, and dividing an i-th sub-segment S i sb into i segments again; broadcasting the sub-segments {S i.1 sb , . . . , S i.i sb } in n sub-channels; and adding the segments {S 2 R , . . . , S N R } to a sub-layer and broadcasting the segments, the first segment broadcast in the first channel being divided and allocated to a few sub-channels, the succeeding segments broadcast in the other channels being just shifted and broadcast.
1. A method for transmitting Near Video on Demand (NVoD) using Catch and Rest (CAR) and sub-channels, the method comprising:
dividing an L-sized content into N segments using the CAR broadcasting scheme, allocating the segments to K channels including a replicate channel, and broadcasting the segments;
dividing a first segment S 1 R (S i R represents an i-th segment of a regular channel) into N sb sub-segments again at given bandwidth using the harmonic broadcasting scheme, and dividing an i-th sub-segment S i sb into i segments again;
broadcasting the sub-segments [S i.1 sb , . . . , S i.i sb ] in n sub-channels; and
adding the segments [S 2 R , . . . , S N R ] to a sub-layer and broadcasting the segments, the first segment broadcast in the first channel being divided and allocated to a number sub-channels, the succeeding segments broadcast in the other channels being just shifted and broadcast;
wherein sub-channels [H 1 sb , . . . , H N sb ] for broadcasting the divided segments [S 2 R , . . . , S N R ] are shifted by S 1 sb , and the other sub-channels are shifted by Offset(i) represented by the following equation:
Offset
(
i
)
=
{
2
×
Period
R
(
i
-
1
)
if
2
≤
i
≤
K
-
2
R
-
1
Offset
(
i
-
1
)
+
3
×
Period
R
(
i
-
1
)
if
i
=
K
-
2
R
Offset
(
i
-
1
)
+
Period
R
(
i
-
1
)
in
other
cases
wherein Period R (i) is a period of the regular channel to which each of i-th sub-channels corresponds.
2. The method of claim 1 , wherein, if R>0, the first replicate channel is not transmitted to the sub-channel.
3. A method for transmitting Near Video on Demand (NVoD) using Catch and Rest (CAR) and sub-channels, the method comprising:
dividing an L-sized content into N segments using the CAR broadcasting scheme, allocating the segments to K channels including a replicate channel, and broadcasting the segments;
dividing a first segment S 1 R (S i R represents an i-th segment of a regular channel) into N sb sub-segments again at given bandwidth using the harmonic broadcasting scheme, and dividing an i-th sub-segment S i sb into i segments again;
broadcasting the sub-segments [S i.1 sb , . . . , S i.i sb ] in n sub-channels; and
adding the segments [S 2 R , . . . , S N R ] sub-layer and broadcasting the segments, the first segment broadcast in the first channel being divided and allocated to a number sub-channels, the succeeding segments broadcast in the other channels being just shifted and broadcast;
wherein, if all the channels are added to the sub-layer, when bandwidth of one channel is b, the total bandwidth B needed is represented by the following equation:
B
=
{
(
2
K
+
H
N
sb
-
2
)
×
b
if
R
>
0
(
2
K
+
H
N
sb
-
1
)
×
b
if
R
=
0.
4. A method for transmitting Near Video on Demand (NVoD) using Catch and Rest (CAR) and sub-channels, the method comprising:
dividing an L-sized content into N segments using the CAR broadcasting scheme, allocating the segments to K channels including a replicate channel, and broadcasting the segments;
dividing a first segment S 1 R (S i R represents an i-th segment of a regular channel) into N sb sub-segments again at given bandwidth using the harmonic broadcasting scheme, and dividing an i-th sub-segment S i sb into i segments again;
broadcasting the sub-segments [S i.1 sb , . . . , S i.i sb ] in n sub-channels; and
adding the segments [S 2 R , . . . , S N R ] to a sub-layer and broadcasting the segments, the first segment broadcast in the first channel being divided and allocated to a number sub-channels, the succeeding segments broadcast in the other channels being just shifted and broadcast;
wherein, if the number of the segments of the sub-channel is N sb and the number of the segments of the regular channel is N R , the maximum service latency d for the terminal is represented by the following equation:
d
=
L
(
2
K
-
2
R
-
3
(
3
(
2
R
+
1
-
1
)
+
4
)
-
1
)
×
ⅇ
H
N
sb
-
C
=
L
N
R
×
N
sb
.