Transmission - 3DTV: Processing and Transmission of 3D Video Signals - page 114

OFDMA symbol number t

k k + 1k + 3k + 5k + 7k + 9k + 11 k + 13 k + 15 k + 17 k + 20 k + 23 k + 26

s

s + 1
s + 3

FCH

UL brust #1

MBS region #1

MBS region #2 UL brust #2

DL brust #3

UL brust #3

DL brust #4

UL brust #4

DL brust #2

DL brust #5

UL brust #5

TTG RTG

s + L

DL subframe UL subframe

Figure 4.6 Construction of MBS Regions in an OFDMA frame in TDD mode

4.3.3.4 Transmission Protocols for 3D Video Services
The transmission of video bit streams that are encoded using the
H.264/MPEG-4 AVC video coding standard [9] over the Real-time
Transport Protocol (RTP) [10, 11] is standardized by the IETF in RFC 3984
[12]. It describes an RTP Payload format for the ITU-T Recommendation
H.264 video codec. In this format, one or more Network Abstraction Layer
(NAL) units that are produced by an H.264 video encoder can be packetized
in each RTP payload. For 3D video transmission, this RTP payload format
is suitable for simulcast coded 3D video representation formats, such as
two-channel stereo video encoded independently using H.264/AVC and
colour-plus-depth. In [13], an Internet Draft that describes an RTP Payload
format for the transmission of 3D video bit streams encoded using the
Multi-view Video Coding (MVC) [9] mode of the ITU-T Recommendation
H.264 video codec over RTP is described. This RTP Payload format allows
the packetization of one or more NAL units that are produced by the video
encoder in each RTP payload. For example, instead of sending the MVC
stream as a single H.264/AVC stream over RTP, the stream is divided into
two parts where NAL units are transmitted over two different RTP port
pairs as if they are separate H.264/AVC streams. The RTP packets are then
transmitted over UDP [14] and IP [15]. Figure 4.7 and Figure 4.8 illustrate
the user plane protocol stack for 3D video delivery over LTE and mobile
WiMAX networks, respectively, starting at the 3D content server and ending
ataUEoranMSinacell.