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公开(公告)号：WO2021250105A1
公开(公告)日：2021-12-16
申请号：PCT/EP2021/065488
申请日：2021-06-09
Inventor： TURNBULL, Rory , APPLEBY, Stephen , STEVENS, Timothy
IPC: H04L29/06 , H04L12/18 , H04L49/201 , H04L65/105 , H04L65/4076 , H04L65/4084 , H04L65/4092 , H04N21/6405 , H04N21/6408
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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公开(公告)号：WO2016107733A1
公开(公告)日：2016-07-07
申请号：PCT/EP2015/079661
申请日：2015-12-14
Inventor： APPLEBY, Stephen , CRABTREE, Ian , STEVENS, Timothy , TURNBULL, Rory , ROPER, Ivan , NILSSON, Michael
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.
Abstract translation: 本发明的示例提供了将多播流转换成单播段的方法。 特别地，基于构成组播流的传输流分组中的时钟参考字段来生成序列标识符。 每次计算新的序列标识符时，都会生成一个新的单播段并分配新的序列标识符。 传输流分组被放置到新分段中，直到处理分组，导致生成新的序列标识符，此时生成另一个新分段，并将分组放入该分段。 在一种改进的方法中，传输流分组中的随机接入指示符用于进一步限制何时生成新分段，以确保新分段与具有随机接入指示符的分组一致。 这种改进使得随机访问在流内和之间更容易地来回。
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公开(公告)号：WO2022037972A1
公开(公告)日：2022-02-24
申请号：PCT/EP2021/071994
申请日：2021-08-06
Inventor： TURNBULL, Rory , STEVENS, Timothy , APPLEBY, Stephen
Abstract: Described is a method of delivery of content to a client device. In particular, the method can be applied to hybrid unicast/multicast delivery networks, where content is provided by a content server to a root proxy, and that root proxy delivers the content to edge proxies over multicast. However, requests for that content in the form of HTTP GET requests from a client device are received by an edge proxy, which subsequently sends an HTTP HEAD request for header information associated with that content directly to the content server. The content server responds over unicast with a suitable response to the HTTP HEAD request, which is received by the edge proxy. The edge proxy takes the response together with the payload from the content segment received over multicast, to generate a client specific content segment for delivery to the client device over unicast.
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公开(公告)号：WO2020173878A1
公开(公告)日：2020-09-03
申请号：PCT/EP2020/054777
申请日：2020-02-24
Inventor： STEVENS, Timothy , TURNBULL, Rory , APPLEBY, Stephen
IPC: H04N21/222 , H04N21/266 , H04N21/6405 , H04N21/643 , H04N21/845 , H04L29/06 , H04L29/08
Abstract: Described is a method of delivering content over a network using an approach referred to 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. The responses containing the requested content are separated into two components: a first component containing elements that are specific to individual client devices (for example session specific data), and a second component that is common to all client devices (typically this is the video content being requested). The first component can be delivered over unicast and the second component over multicast. Identifiers are introduced into each of the first and second components to aid recombination of the components to form the original responses. The separation and recombination are handled by suitably configured proxy servers.
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公开(公告)号：WO2016050747A1
公开(公告)日：2016-04-07
申请号：PCT/EP2015/072383
申请日：2015-09-29
Inventor： STEVENS, Timothy , KEGEL, Ian , WILLS, Andrew
IPC: H04L29/06
CPC classification number: H04L65/80 , H04L45/3065 , H04L65/105 , H04L65/605 , H04L65/607 , H04L65/608
Abstract: Methods, apparatus and systems are disclosed for managing streamed communication (such as video, audio, or audio-visual communication) between client devices and remote devices via a digital data communication network in situations where the data communication network comprises one or more routers operable to receive streamed data from one or more client devices and/or from one or more other routers, and to forward such streamed data to one or more remote devices and/or to one or more other routers such as to enable the client device and potentially-varying subsets of the one or more remote devices to participate in a communication session.
Abstract translation: 公开的方法，装置和系统用于在数据通信网络包括一个或多个路由器可操作以在数据通信网络的情况下经由数字数据通信网络来管理客户端设备与远程设备之间的流式通信（例如视频，音频或视听通信） 从一个或多个客户端设备和/或来自一个或多个其他路由器接收流数据，并且将这样的流传输的数据转发到一个或多个远程设备和/或一个或多个其他路由器，以使客户端设备和潜在的 - 一个或多个远程设备的不同子集参与通信会话。
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Patent Agency Ranking
公开(公告)号：WO2022207310A1
公开(公告)日：2022-10-06
申请号：PCT/EP2022/056705
申请日：2022-03-15
Inventor： NILSSON, Michael , STEVENS, Timothy , APPLEBY, Stephen , TURNBULL, Rory
IPC: H04L65/612 , H04L65/611
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：WO2022128548A1
公开(公告)日：2022-06-23
申请号：PCT/EP2021/084263
申请日：2021-12-03
Inventor： TURNBULL, Rory , STEVENS, Timothy , APPLEBY, Stephen
Abstract: A method of managing a network for delivering content to a client device, where content segments are delivered over multicast to a proxy. The received segments are stored at the proxy, before delivery of those segments is made from the proxy to the client device over unicast. Whilst the proxy receives further segments over multicast, it probes the network by making unicast requests for data (dummy data or additional content segments), and receiving those segments over unicast from the content server. The multicast rate reception rate and the unicast (probe) rate are measured and a maximum network throughput is calculated as the sum of these two rates. Subsequent segments are then delivered from the proxy to the client device at the calculated maximum network throughput rate, or at some rate dependent thereon. Thus, the client device will receive segments at a rate that is more indicative of the actual maximum network throughput, so can better use its adaptive bit rate algorithms to determine whether a switch to higher bit rate segments is appropriate.
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公开(公告)号：WO2021063594A1
公开(公告)日：2021-04-08
申请号：PCT/EP2020/073238
申请日：2020-08-19
Inventor： TURNBULL, Rory , STEVENS, Timothy , APPLEBY, Stephen
IPC: H04L29/06 , H04N21/2343 , H04N21/6405 , H04N21/643 , H04N21/845
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：WO2021037500A1
公开(公告)日：2021-03-04
申请号：PCT/EP2020/071911
申请日：2020-08-04
Inventor： APPLEBY, Stephen , TURNBULL, Rory , STEVENS, Timothy
IPC: H04L29/06 , H04N21/6405 , H04N21/6408
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：WO2020109496A1
公开(公告)日：2020-06-04
申请号：PCT/EP2019/082956
申请日：2019-11-28
Inventor： TURNBULL, Rory , STEVENS, Timothy
IPC: H04L29/06
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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