Table 2 List of notation

V

All videos played in multicast groups

L

Number of video layers a video is encoded in

X

Index of a video layer {1, 2,...,L}

v _x

x th layer of video v

N _v

Users request video v

$m_1^{v,x}$

MCS used by the BS for the x th layer of video v in the first step

$m_2^{v,x}$

MCS used by the RSs for the x th layer of video v in the second step

$m_3^{v,x}$

MCS used by the BS for the x th layer of video v in the second step

$R\left(m_j^{v,x}\right)$

Transmission rate of the MCS (bits/slot)

T

Total multicast time

t 1

Duration of the first step

t 2

Duration of the second step

S ₁

Total resources available in the first step (slot)

S ₂

Resources available for the RSs in the second step (slot)

S ₃

Resources available for the BS in the second step (slot)

bit_v,x

Bit rate of the x^th layer of video v (bits/OFDMA frame)

$S_1^{\mathsf{\text{used}}}$

Total resources used in the first step (slot)

$S_2^{\mathsf{\text{used}}}$

Resources used by the RSs in the second step (slot)

$S_3^{\mathsf{\text{used}}}$

Resources used by the BS in the second step (slot)

B

Total frequency band in the system (subchannel)

C ₁

Resources available for the BS in the first step within a basic service time

C ₂

Resources available for RSs in the second step within a basic service time