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公开(公告)号：US20220141543A1
公开(公告)日：2022-05-05
申请号：US17433738
申请日：2020-02-26
Inventor： Rory TURNBULL , Stephen APPLEBY , Timothy STEVENS
IPC: H04N21/6405 , H04N21/643 , H04N21/845 , H04N21/222 , H04N21/266 , H04N21/2183
Abstract: Described is a method of delivering content over network using an approach referred to here as “Multicast Assisted Unicast Delivery” (MAUD), as a multicast network is used to assist, rather than substituting for, an otherwise unicast path. Content is requested by client devices from a content server over unicast. These unicast requests are sent via a first and a second proxy, before being sent by the second proxy to the content server, all over unicast. The responses containing the requested content is sent back to the second proxy over unicast from the content server. The second proxy processes the received unicast responses and sends the responses over a multicast stream to the first proxy. The first proxy processes the received responses and sends them onto the requesting client devices over unicast.
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公开(公告)号：US20170366588A1
公开(公告)日：2017-12-21
申请号：US15540322
申请日：2015-12-14
Inventor： Stephen APPLEBY , Ian CRABTREE , Timothy STEVENS , Rory TURNBULL , Ivan ROPER , Michael NILSSON
IPC: H04L29/06
CPC classification number: H04L65/4076 , H04L65/4084 , H04L65/601 , H04L65/605 , H04L65/608
Abstract: Examples of the present invention provide a method of converting a multicast stream into unicast segments. In particular, sequence identifiers are generated based on a clock reference field in the transport stream packets that make up the multicast stream. Every time a new sequence identifier is calculated, a new unicast segment is generated and assigned with the new sequence identifier. Transport stream packets are placed into the new segment until a packet is processed that causes a new sequence identifier to be generated, at which point another new segment is generated and packets placed into that segment. In an improved method, random access indicators in the transports stream packets are used to further constrain when a new segment is generated, to ensure that new segments are coincident with a packet having a random access indicator. This improvement makes random access easier back and forth between and within a stream.
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公开(公告)号：US20170127147A1
公开(公告)日：2017-05-04
申请号：US15129481
申请日：2015-03-24
Inventor： Ian CRABTREE , Michael NILSSON , Rory TURNBULL , Stephen APPLEBY
IPC: H04N21/6405 , H04N21/2343 , H04L29/06 , H04N21/2187 , H04N21/84 , H04L29/08 , H04N21/845 , H04N21/438
Abstract: The invention presents a method of generating a multicast stream for transporting video content such as live TV. First, the video content is encoded, and segmented into temporal chunks. Each chunk is then encapsulated in one or more RTP pacets, depending on the size of the chunk, and each RTP packet is marked with a chunk marker to indicate which of the packets the boundaries between chunks lie. The multicast stream is then generated by encapsulating the RTP packets, preferably using UDP in IP packets. The chunk marker is provided for by a special field in the RTP payload header. The chunk marker can be a chunk index or a chunk offset. Both, individually and in combination, can be used to determine the boundary between chunks.
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公开(公告)号：US20220345508A1
公开(公告)日：2022-10-27
申请号：US17764821
申请日：2020-08-19
Inventor： Rory TURNBULL , Timothy STEVENS , Stephen APPLEBY
IPC: H04L65/612 , H04L1/00 , H04L65/611
Abstract: Described is a method of managing a network for delivering content in a hybrid unicast/multicast network, where content is requested by clients over unicast, but all or some of the content is delivered in part over multicast. Typically, a client requests content (in the form of segments) via a first proxy. The segments are delivered to the first proxy over multicast from a second proxy, before onward transmission to the requesting client over unicast. The segments are also cached at the first proxy, and can be transmitted over unicast to other clients requesting those segments. However, problems can arise if cached segments are transmitted to clients too quickly. In one solution, the first proxy measures the multicast rate of delivery of segments from the second proxy over multicast, and limits the transmission rate of those segments over unicast to requesting clients to no greater than the measured multicast delivery rate.
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公开(公告)号：US20220303606A1
公开(公告)日：2022-09-22
申请号：US17637376
申请日：2020-08-04
Inventor： Stephen APPLEBY , Rory TURNBULL , Timothy STEVENS
IPC: H04N21/266 , H04N21/239 , H04N21/6405 , H04N21/6408 , H04N21/222
Abstract: Described is a method of managing a network for delivering content in a hybrid unicast/multicast network, where content is requested by clients over unicast, but all or some of the content is delivered in part over multicast. A client requests content (in the form of segments) and receive the responses (segments) over unicast via a first proxy. The first proxy measures the time between requests and associated requested segment sizes. These measurements are used to effectively determine a unicast request rate given by the segment size divided by the time between requests. Subsequent requested segments can then be delivered over multicast over a portion of the route to the client using a multicast rate that is set as a function of (for example, 110% of) the unicast request rate. In general, the multicast path will be from a second proxy to the first proxy.
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Patent Agency Ranking
公开(公告)号：US20220131920A1
公开(公告)日：2022-04-28
申请号：US17298205
申请日：2019-11-28
Inventor： Rory TURNBULL , Timothy STEVENS
IPC: H04L65/60 , H04L65/611 , H04L65/65
Abstract: Presented are methods for converting a multicast media stream to unicast segments, for delivery over generic IP networks such the Internet. The unicast segments can be converted back again to a multicast stream that is identical to the original multicast stream closer to the consuming client device. Information required to regenerate a multicast stream from the generated unicast segments that is identical to the original multicast stream is also encoded into the file name of the generated unicast segments. Additionally, RTP header information from the multicast stream that is not required when the unicast segments are generated are stored in files linked to the generated unicast segments, enabling the multicast stream that is regenerated to be identical to the original multicast stream even at the RTP level.
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公开(公告)号：US20220131921A1
公开(公告)日：2022-04-28
申请号：US17298360
申请日：2019-11-28
Inventor： Rory TURNBULL , Timothy STEVENS
IPC: H04L65/65 , H04L65/611 , H04L12/18
Abstract: Presented are methods for converting a multicast media stream to unicast segments, for delivery over generic IP networks such the Internet. The unicast segments can be converted back again to a multicast stream that is identical to the original multicast stream closer to the consuming client device. Information required to regenerate a multicast stream from the generated unicast segments that is identical to the original multicast stream is also encoded into the file name of the generated unicast segments. Additionally, RTP header information from the multicast stream that is not required when the unicast segments are generated are stored in files linked to the generated unicast segments, enabling the multicast stream that is regenerated to be identical to the original multicast stream even at the RTP level.
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公开(公告)号：US20180191803A1
公开(公告)日：2018-07-05
申请号：US15740525
申请日：2016-06-23
Inventor： Rory TURNBULL , Jonathan RENNISON
IPC: H04L29/06 , H04N21/472 , H04N21/2187 , H04N21/262
CPC classification number: H04L65/608 , H04L65/4084 , H04N21/2187 , H04N21/26258 , H04N21/26283 , H04N21/472 , H04N21/6587 , H04N21/8456
Abstract: Examples of the present invention provide a method of reducing the latency in streaming live media by a client from a server. The client uses manifest information to determine the “live edge” of the live media stream, where the live edge is represented by the segment from the media stream corresponding to the current time. The client then uses this to identify the next segment, which is the segment in time that will next become available. The client then starts making repeated polling requests for that next segment until the segment becomes available. As a result, the newest possible segment is obtained by the client as soon as it becomes available, and latency is reduced. Further, when adopted by all clients, the latency variation between clients is also reduced.
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公开(公告)号：US20170118263A1
公开(公告)日：2017-04-27
申请号：US15129486
申请日：2015-03-24
Inventor： Ian CRABTREE , Michael NILSSON , Rory TURNBULL , Stephen APPLEBY
CPC classification number: H04L65/4076 , H04L65/607 , H04L67/02 , H04L67/42 , H04N21/23439 , H04N21/4383 , H04N21/6405 , H04N21/6408 , H04N21/8456 , H04W76/40
Abstract: The invention presents a method of providing feedback for receipt of a multicast video stream. The feedback mechanism allows the number of clients receiving over multicast to be determined, which can then be used to manage multicast delivery, including switching decisions between multicast and unicast. Video content is delivered over a multicast stream from a content server to a plurality of client devices. The client devices are each configured to respond at regular intervals whilst receiving the multicast video stream by transmitting an HTTP HEAD request message to the content server. The HTTP HEAD request refers to metadata relating to a manifest file associated with the video stream. The number of client devices receiving the multicast video stream is determined based on the number of HEAD requests received at the content server. The multicast video delivery can then be managed accordingly, and can also take into account the number of unicast clients that are requesting the corresponding unicast stream to the multicast stream.
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公开(公告)号：US20250055896A1
公开(公告)日：2025-02-13
申请号：US18717864
申请日：2022-11-23
Inventor： Michael NILSSON , Stephen APPLEBY , Rory TURNBULL , Timothy STEVENS
IPC: H04L65/611 , H04L65/80
Abstract: A method of managing content delivery to a client device by a proxy, where the content is made up of a sequence of segments. The proxy starts off by receiving content requests from the client device over unicast, and fulfilling those requests by forwarding them to a content server, and receiving that content over unicast before forwarding onto the client device. The proxy then determines that a multicast channel should be joined to more efficiently receive the content. However, the multicast channel is likely to be ahead of the available unicast data. Therefore, a multicast join command is delayed until the proxy has taken steps to obtain subsequent content by unicast faster than that content is being requested by the client device, so that the obtained content has caught up with the content available on the multicast channel. The proxy can do so by requesting some of this content from the re-transmission server in advance of it being requested by the client device, and some from the content server in response to requests from the client device. Only when the requested content has caught up with the multicast channel does the proxy take action to join the multicast channel.
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