Apparatus and method for receiving multiple streams in a mobile broadcast system

• US 7,899,088 B2
• Filed: 10/16/2006
• Issued: 03/01/2011
• Est. Priority Date: 10/14/2005
• Status: Active Grant

• Current Assignee: Industry-University Cooperation Foundation Hanyang University
• Original Assignee: Industry-University Cooperation Foundation Hanyang University, Samsung Electronics Co. Ltd.
• Inventors: Jung, Ki-Ho, Song, Young-Joo, Lim, Young-Kwon, Lee, Kook-Heui, Jeong, Je-Chang
• Primary Examiner(s): Chou; Albert T
• Application Number:
  US11/581,082
• Publication Number:
  US 20070091912A1
• Time in Patent Office: 1,597 Days
• Field of Search: 370/536, 370/509, 375/240.08, 348/578
• US Class Current: 370/536
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/38 by adapting coding or compression rate
• CPC Class Codes: H04L 47/43 Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04N 21/23406 involving management of server-side video buffer
• CPC Class Codes: H04N 21/234318 by decomposing into objects, e.g. MPEG-4 objects
• CPC Class Codes: H04N 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/4305 Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• CPC Class Codes: H04N 21/4384 involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
• CPC Class Codes: H04N 21/44004 involving video buffer management, e.g. video decoder buffer or video display buffer
• CPC Class Codes: H04N 21/44012 involving rendering scenes according to scene graphs, e.g. MPEG-4 scene graphs
• CPC Class Codes: H04N 21/4532 involving end-user characteristics, e.g. viewer profile, preferences monitoring of user activities for profile generation for accessing a video database G06F16/739; user profiles in network data switching protocols H04L67/306; processing of user preferences or user profiles in wireless networks H04W8/18
• CPC Class Codes: H04N 21/64315 DVB-H
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Abstract

An apparatus and method are provided for receiving multiple streams. A group session structure is defined and streams are decoded according to the defined group session structure so that a single decoder can sequentially process demultiplexed streams allocated to multiple decoding buffers when multiple logical media streams are multiplexed into one physical stream in a mobile broadcast communication system based on Lightweight Application Scene Representation (LASeR).

Claims

1. A method for receiving multiple streams in a mobile broadcast system, the method comprising:

receiving multiplexed logical channels on which data streams are transmitted from a service provider to a mobile terminal through a communication network;

demultiplexing the multiplexed logical channels;

decoding an elementary stream in each corresponding ones of the demultiplexed logical channels by a single decoder based on a group descriptor comprising a list of stream identifiers (IDs) identifying streams to be decoded in one group at a decoding time determined for each decoding buffer; and

composing the decoded elementary streams of logical channels with a media.

2. The method of claim 1, wherein the group descriptor is included in an access unit payload.

3. The method of claim 1, wherein a first decoding time is determined using equation DT0(S1)=startTime+slotTime(0) and a decoding time at which data of each decoding buffer is to be currently decoded is determined using equation DTn(S1)=DTn−

1+periodTime, where DT0 is the first decoding time, startTime is a time at which a first access unit (AU) starts to be decoded, slotTime is a decoding time allocated to each elementary stream, DTn is an n-th decoding time, DTn−

1 is a (n−

1)-th decoding time, periodTime is a period time required to decode each elementary stream included in a source list once, and S1 is a stream.

4. The method of claim 1, wherein when the time at which the single decoder accesses and decodes the data of the decoding buffers is determined, a time at which each decoding buffer is accessed is determined by referring to slot times allocated on a stream-by-stream basis.

5. The method of claim 1, wherein the service provider comprises a server of a broadcast provider.

6. An apparatus for receiving multiple streams in a mobile broadcast system, comprising:

a receiver for receiving multiplexed logical channels on which data streams are transmitted from a service provider to a mobile terminal through a communication network;

a demultiplexer for demultiplexing the multiplexed logical channels;

a single decoder for decoding an elementary stream in each corresponding ones of the demultiplexed logical channels based on a group descriptor comprising a list of stream identifiers (IDs) identifying streams to be decoded in one group at a decoding time determined for each decoding buffer; and

a composer for composing the decoded elementary streams of logical channels with a media.

7. The apparatus of claim 6, wherein the group descriptor is included in an access unit payload.

8. The apparatus of claim 6, wherein the controller determines a first decoding time using equation DT0(S1)=startTime+slotTime(0) and determines a decoding time at which data of each decoding buffer is to be currently decoded using equation DTn(S1)=DTn−

1+periodTime, where DT0 is the first decoding time, startTime is a time at which a first access unit (AU) starts to be decoded, slotTime is a decoding time allocated to each elementary stream, DTn is an n-th decoding time, DTn−

1 is a (n−

1)-th decoding time, periodTime is a period time required to decode each elementary stream included in a source list once, and S1 is a stream.

9. The apparatus of claim 6, wherein when the time at which the single decoder accesses and decodes the data of the decoding buffers is determined, a time at which each decoding buffer is accessed is determined by referring to slot times allocated on a stream-by-stream basis.

10. The apparatus of claim 6, wherein the service provider comprises a server of a broadcast provider.