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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：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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Patent Agency Ranking
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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公开(公告)号：US20210297358A1
公开(公告)日：2021-09-23
申请号：US17266337
申请日：2019-08-08
Inventor： Yousif HUMEIDA , Stephen APPLEBY , Michael NILSSON
IPC: H04L12/841 , H04L12/26 , H04L12/807
Abstract: In examples of the present invention, during delivery of content, the round trip times for each delivered data packet are measured and the congestion window used for delivery is adjusted accordingly. The congestion window is set to a relatively high value when the round trip times are relatively low, and set to a relatively low value when the round trip times are relatively high.
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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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公开(公告)号：US20240187466A1
公开(公告)日：2024-06-06
申请号：US18553110
申请日：2022-03-15
Inventor： Michael NILSSON , Timothy STEVENS , Stephen APPLEBY , Rory TURNBULL
IPC: H04L65/611 , H04L65/612
CPC classification number: H04L65/611 , H04L65/612
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 before forwarding onto the client device. At some stage, the proxy determines that a multicast channel should be joined to more efficiently receive the required 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 stores this content and uses it to respond to requests from the client device. Only then does the proxy take action to join the multicast channel.
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公开(公告)号：US20230254349A1
公开(公告)日：2023-08-10
申请号：US18008615
申请日：2021-06-09
Inventor： Rory TURNBULL , Stephen APPLEBY , Timothy STEVENS
IPC: H04L65/1045 , H04L65/611 , H04L65/612
CPC classification number: H04L65/1045 , H04L65/611 , H04L65/612
Abstract: A method of managing a network for delivering content to a client device, where content segments are delivered to a proxy in a multicast group, before delivery from the proxy to the client device over unicast. The proxy intermittently leaves the multicast group to probe the network by making unicast request for content segments, receiving those segments over unicast from the content server and forwarding those segments onto the client device. This allows the client device to determine the maximum throughput between the content server and the client device via the proxy, and thus the client device can use its adaptive bit rate algorithms to determine if the network can support a switch to a higher bit rate stream, and request a higher bit rate stream accordingly. The higher bit rate stream can be serviced by the proxy joining or establishing a suitable multicast group.
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