Media stream scheduling for hiccup-free fast-channel-change in the presence of network chokepoints

• US 9,363,302 B2
• Filed: 04/07/2008
• Issued: 06/07/2016
• Est. Priority Date: 10/10/2003
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: Green, Dustin L.
• Primary Examiner(s): BLAIR, DOUGLAS B
• Application Number:
  US12/098,820
• Publication Number:
  US 20080189425A1
• Time in Patent Office: 2,983 Days
• Field of Search: 709231-234
• US Class Current: 1/1
• CPC Class Codes: H04L 65/764 at the destination reformatting of additional data in video clients H04N21/4355
• CPC Class Codes: H04N 21/238 Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams hybrid fiber coaxial [HFC] networks for downstream channel allocation for video distribution H04L12/2801; flow control in packet networks H04L47/10; real-time communication protocols in data switching networks H04L65/00; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/23805 Controlling the feeding rate to the network, e.g. by controlling the video pump
• CPC Class Codes: H04N 21/2387 Stream processing in response to a playback request from an end-user, e.g. for trick-play
• CPC Class Codes: H04N 21/2402 Monitoring of the downstream path of the transmission network, e.g. bandwidth available traffic monitoring in data switching networks H04L43/00; monitoring data switching networks utilization H04L43/0876
• CPC Class Codes: H04N 21/242 Synchronization processes, e.g. processing of PCR [Program Clock References] arrangements for synchronising broadcast or distribution via plural systems in broadcast distribution systems H04H20/18
• CPC Class Codes: H04N 21/26216 involving the channel capacity, e.g. network bandwidth admission control, resource allocation in open networks H04L12/5692; flow control in packet networks H04L47/10; establishing a schedule or organising the servicing of application requests taking into account QoS H04L67/61
• CPC Class Codes: H04N 21/4384 involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency

Abstract

An implementation, as described herein, facilitates fast start-up of a new media stream while avoiding temporal interruption (i.e., “hiccups”) of the presentation of that new media stream. At least one implementation, described herein, coordinates the delivery of multiple simultaneous media streams on a media-stream network. Its coordination accounts for traversal of bandwidth-restricted chokepoints; quickly stopping delivery of one or more media streams from the set of streams; quickly initiating delivery and presentation of one or more new media streams not previously in the set (i.e., a “channel chlangee”): and producing clean playback of all of the streams in the set, despite their different timelines. This abstract itself is not intended to limit the scope of this patent. The scope of the present invention is pointed out in the appending claims.

Claims

1. A computer-readable memory storage device having processor-executable instructions that, when executed by a processor, perform a method comprising:

determining bandwidth capacity of one or more chokepoints of a media-stream network over a first timeslot;

sending current outgoing media streams via the media-stream network;

calculating an available data-rate reservation on a time-dependent basis through the network to a presentation device, wherein an available data-rate is limited by the determined bandwidth capacity of the one or more chokepoints in the network and an already-reserved time-dependent data-rate usage for the one or more chokepoints;

maintaining a deadline schedule, over the first timeslot, of the current outgoing media streams, wherein the deadline schedule determines a deadline for sending data from the current outgoing media streams and wherein maintaining the deadline schedule comprises using an unallocated bandwidth of a chokepoint, determined from the bandwidth capacity, to send data from outgoing media streams from future timeslots at or before the deadline of the current outgoing media streams; and

inserting deadlines for sending data of the current outgoing media streams into the deadline schedule, wherein the data of one of the current outgoing media streams scheduled proximate to a start of another media stream is scheduled to be sent via the network to the presentation device at a data-rate equal to or greater than the calculated available data-rate, wherein the deadline schedule determines a minimum bit-rate for sending data from the current outgoing media streams.

2. A memory storage device as recited in claim 1, having additional processor-executable instructions that when executed by the processor, perform the method further comprising:

receiving a request, from a media-stream presentation device, to start sending a new media stream on the media-stream network having the one or more bandwidth-limiting chokepoints therein; and

calculating an available data-rate reservation on a time-dependent basis through the network to the presentation device, wherein the available data-rate is limited by the determined bandwidth capacity of the one or more chokepoints in the network and their already-reserved time-dependent data-rate usage.