Multicast-based content transmitting system and method, and device and method for estimating high-speed movement

• US 10,341,704 B2
• Filed: 08/09/2017
• Issued: 07/02/2019
• Est. Priority Date: 07/06/2011
• Status: Active Grant

• Current Assignee: SK Planet Co., Ltd. (SK Telecom Co., Ltd.)
• Original Assignee: SK Planet Co., Ltd. (SK Telecom Co., Ltd.)
• Inventors: Bae, Tae Meon
• Primary Examiner(s): Alcon, Fernando
• Application Number:
  US15/673,034
• Publication Number:
  US 20170339445A1
• Time in Patent Office: 692 Days
• Field of Search: None
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 7/223 using block-matching
• CPC Class Codes: H04L 1/1678 where the control information is for timing, e.g. time stamps
• CPC Class Codes: H04L 1/1838 for semi-reliable protocols, e.g. for less sensitive applications such as streaming video buffer level management for video bitstream receiver H04N21/44004
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 12/185 with management of multicast group membership
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/182 the unit being a pixel
• CPC Class Codes: H04N 19/51 Motion estimation or motion compensation
• CPC Class Codes: H04N 19/513 Processing of motion vectors
• CPC Class Codes: H04N 19/517 by encoding
• CPC Class Codes: H04N 19/533 Motion estimation using multistep search, e.g. 2D-log search or one-at-a-time search [OTS]
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder
• CPC Class Codes: H04N 21/23439 for generating different versions
• CPC Class Codes: H04N 21/26275 for distributing content or additional data in a staggered manner, e.g. repeating movies on different channels in a time-staggered manner in a near video on demand system
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/44209 Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896
• CPC Class Codes: H04N 21/6405 Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/64776 for requesting retransmission, e.g. of data packets lost or corrupted during transmission from server ARQ protocols H04L1/18; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04N 21/6581 : Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application

Abstract

The present invention relates to a multicast-based content transmitting system and method, and a device and method for estimating high-speed movement. Included are: a content providing device for generating N×M multicast stream channels having different transmission start times and transmission rates, providing N×M multicast stream channel lists, and transmitting content through one channel of N×M multicast stream channels; and a user terminal for selecting one channel of the N×M multicast stream channel lists provided from the content providing device and receiving content through the selected multicast stream channel.

Claims

1. A user terminal comprising:

a memory;

a processor configured to execute instructions stored in the memory and to;

receive an N×

M multicast stream channel list having the N×

M multicast stream channels configured of N multicast stream channels having transmission start times arranged at time intervals of T and M multicast stream channels of different transmission rates configured in each of the N multicast stream channels;

transmit a channel selection signal for selecting a multicast stream channel from the N×

M multicast stream channel list;

receive contents through a multicast stream channel corresponding to the channel selection signal;

select an available multicast stream channel from the N×

M multicast stream channel list;

confirm loss of packets in the transmitted contents;

compare a number of lost packets of the transmitted contents with a reference value; and

restore the lost packets using a Forward Error Correction method.

2. The user terminal according to claim 1, wherein the N×

M multicast stream channel list includes multicast stream channel information configured of information on contents to be transmitted, a transmission start time and a transmission rate of each channel.

3. The user terminal according to claim 2, wherein the processor is configured to:

select a multicast stream channel having a transmission rate lower than the available transmission rate from the provided N×

M multicast stream channel list as a candidate multicast stream channel; and

select a multicast stream channel having a transmission start time closest to the contents transmission request time in the N×

M multicast stream channel list among the candidate multicast stream channels.

4. The user terminal according to claim 2, wherein, when retransmission of the contents is requested, the processor is configured to:

select a candidate multicast stream channel list by comparing an available transmission rate of the user terminal at the time of requesting retransmission of the contents with transmission rates of the N×

M multicast stream channel list; and

select a multicast stream channel by comparing a contents retransmission request time with the transmission start time.

5. The user terminal according to claim 2, wherein the processor is configured to:

select a multicast stream channel having a transmission start time later than the contents transmission request time in the N×

M multicast stream channel list from the provided N×

M multicast stream channel list as a candidate multicast stream channel; and

select a multicast stream channel having a transmission rate lower than the available transmission rate and highest among the candidate multicast stream channels.

6. A multicast-based contents reception method of a user terminal, the method comprising the steps of:

(a) receiving, by the user terminal, an N×

M multicast stream channel list having the N×

M multicast stream channels configured of N multicast stream channels having transmission start times arranged at time intervals of T and M multicast stream channels of different transmission rates configured in each of the N multicast stream channels, wherein the N×

M multicast stream channel list including information on multicast stream channels configured of contents information, a transmission start time and a transmission rate;

(b) selecting, by the user terminal, a multicast stream channel by comparing the transmission start time, the transmission rate and the contents information of the transmitted N×

M multicast stream channel list with an available transmission rate of a network measured by the user terminal, a contents transmission request time and information on contents to be received;

(c) transmitting, by the user terminal, a channel selection signal for selecting the multicast stream channel;

(d) receiving, by the user terminal, contents using the selected multicast stream channel;

(e) confirming loss of packets in the transmitted contents;

(f-1) comparing a number of lost packets of the transmitted contents with a reference value;

(f-2) restoring the lost packets using a Forward Error Correction method; and

(g) requesting retransmission of the same contents when the lost packets are not restored.

7. The method according to claim 6, wherein step (b) includes the steps of:

(b-1) selecting a multicast stream channel having a transmission rate lower than the available transmission rate from the transmitted N×

M multicast stream channel list as a candidate multicast stream channel; and

(b-2) selecting a multicast stream channel having a transmission start time closest to the contents transmission request time in the N×

M multicast stream channel list among the candidate multicast stream channels.

8. The method according to claim 6, wherein step (b) includes the steps of:

(b-1) selecting a multicast stream channel having a transmission start time later than the contents transmission request time in the N×

M multicast stream channel list from the transmitted N×

M multicast stream channel list as a candidate multicast stream channel; and

(b-2) selecting a multicast stream channel having a highest transmission rate among the candidate multicast stream channels.

9. A multicast-based contents reception method of a user terminal, the method comprising the steps of:

(a) receiving, by the user terminal, an N×

M multicast stream channel list having the N×

M multicast stream channels configured of N multicast stream channels having transmission start times arranged at time intervals of T and M multicast stream channels of different transmission rates configured in each of the N multicast stream channels, wherein the N×

M multicast stream channel list including information on multicast stream channels configured of contents information, a transmission start time and a transmission rate;

(b) selecting, by the user terminal, a multicast stream channel by comparing the transmission start time, the transmission rate and the contents information of the transmitted N×

M multicast stream channel list with an available transmission rate of a network measured by the user terminal, a contents transmission request time and information on contents to be received;

(c) transmitting, by the user terminal, a channel selection signal for selecting the multicast stream channel;

(d) receiving, by the user terminal, contents using the selected multicast stream channel; and

(e) comparing, by the user terminal, the number of lost packets of the transmitted contents with a reference value for restoring the lost packets using a Forward Error Correction method.

10. A user terminal comprising:

a memory;

a processor configured to execute instructions stored in the memory and to;

receive an N×

M multicast stream channel list having the N×

M multicast stream channels configured of N multicast stream channels having transmission start times arranged at time intervals of T and M multicast stream channels of different transmission rates configured in each of the N multicast stream channels;

transmit a channel selection signal for selecting a multicast stream channel from the N×

M multicast stream channel list;

receive contents through a multicast stream channel corresponding to the channel selection signal;

select an available multicast stream channel from the N×

M multicast stream channel list;

restore and store lost packets using a Forward Error Correction method when the number of lost packets is smaller than a reference value; and

request retransmission of the contents after deleting packets of the transmitted contents when the number of lost packets exceeds the reference value.