CN104604263B - 用于dash格式化的内容流送期间的无缝单播－广播切换的方法 - Google Patents

用于dash格式化的内容流送期间的无缝单播－广播切换的方法 Download PDF

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CN104604263B
CN104604263B CN201380045374.9A CN201380045374A CN104604263B CN 104604263 B CN104604263 B CN 104604263B CN 201380045374 A CN201380045374 A CN 201380045374A CN 104604263 B CN104604263 B CN 104604263B
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sap
embms
unicast
dash
media
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CN104604263A (zh
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O·奥亚曼
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Apple Inc
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Intel Corp
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Abstract

一种对于超文本传输协议(HTTP)上动态自适应流送(DASH)格式化的内容从基于单播的传递切换到基于演进的多媒体广播多播服务(eMBMS)的传递的方法。该方法可以包括将专用流接入点(SAP)插入媒体中用于在基于单播的内容传递和基于eMBMS的内容传递之间切换。SAP的使用使DASH客户端能够在单播和广播传递模式之间无缝地切换。

Description

用于DASH格式化的内容流送期间的无缝单播－广播切换的 方法
背景技术
超文本传输协议(HTTP)流送是互联网视频的一种广泛使用的多媒体传递形式。基于HTTP的多媒体传递由于广泛采用了HTTP以及其底层的传输控制协议/互联网协议(TCP/IP)协议，因此提供了可靠性和部署简单性。此外，基于HTTP的多媒体传递通过避免网络地址转换(NAT)和防火墙穿越问题而允许容易和不费力的流送服务。基于HTTP的流送还提供了使用标准HTTP服务器和高速缓存来代替专用流送服务器的能力，并且由于在服务器端具有最少状态信息而具有较佳的可扩展性。
对互联网上多媒体内容进行流送的一种方法是使用基于实时流送协议(RTSP)的自适应流送。RTSP可以是在娱乐和通信系统中用来控制流送媒体媒体服务器的网络控制协议。RTSP协议可用于以基于推送的和服务器控制的方式建立和控制多个端点之间的媒体会话。
查看互联网上多媒体内容的另一种方法是HTTP渐进式下载，该HTTP渐进式下载可用于从标准HTTP Web服务器的媒体传递。
支持基于HTTP的渐进式下载的客户端可以通过执行向Web服务器的字节范围请求来查找媒体文件中的位置。然而，基于HTTP的渐进式下载也可以包括几个缺点，包括：(i)若用户决定在渐进式下载已经开始之后停止观看内容(例如，切换内容)则可能浪费带宽、(ii)渐进式下载不是比特率自适应的、(iii)渐进式下载不支持实况媒体服务、以及(iv)渐进式下载在分组传递中引入随机量的延迟时间，从而使用要实现的缓冲并且造成回放中的中断。
附图简述
本公开案的特征和优点从以下结合附图的详细描述中将显而易见，详细描述和附图通过示例一起说明了本公开案的特征；以及，附图中：
图1是说明按照一示例、在流送数据的SAP处的单播连接和多播连接之间的超文本传输协议上动态自适应流送(DASH)客户端变化的实施例的时间线图；
图2是说明按照一示例、在流送数据的SAP处的单播连接和多个交替的多播连接之间的DASH客户端变化的实施例的时间线图；
图3是表示按照一示例、从单播连接到多个多播连接的数据流切换的图示；
图4是说明按照一实施例、在单播连接以及多播连接A和B之间的DASH客户端变化的实施例的时间线图；
图5是表示按照一示例、在单播连接以及多个标准清晰度(SD)和高清晰度(HD)多播连接之间的数据流切换的图示；
图6是说明按照一示例、在流送数据的SAP处的两个多播连接之间的DASH客户端变化的实施例的时间线图；
图7是表示按照一示例、在多个多播连接之间的数据流切换的图示；
图8是说明按照一示例、在单播和多播连接之间的DASH客户端变化的流程图；
图9是说明按照一示例、在DASH客户端处从在单播连接上接收媒体流到在多播连接上接收媒体流的切换的流程图；
图10是说明按照一示例、在DASH客户端处从在一多播连接上接收媒体流到在一个不同的多播连接上接收媒体流的切换的流程图；
图11是说明按照一示例、在单播和多播服务器以及用户设备(UE)之间的通信的实施例的框图；
图12是说明按照一示例、在媒体服务器和UE之间的通信的实施例的框图；
图13是说明按照一示例、用于在数据中插入流接入点的方法的流程图；
图14是说明按照一实施例、向UE提供多媒体内容的媒体服务器的实施例的框图；以及
图15说明了按照一示例的用户设备(UE)的示意图。
现在将参照图示的示例性实施例，此处将使用具体语言来描述示例性实施例。然而将理解，由此不意图对本发明的范围作出任何限制。
详细描述
在公开和描述本发明之前，应当理解，本发明不限于此处公开的特定结构、过程步骤或材料，本领域普通技术人员会认识到，本发明可扩展到此处公开的特定结构、过程步骤或材料的等价物。还应当理解，此处采用的术语仅用于描述特定示例，而不意图是限制性的。不同附图中的相同附图标记表示相同的元件。流程图和过程中提供的数字是为说明步骤和操作时的清楚性而提供的，而不必要表示特定次序或顺序。
超文本传输协议(HTTP)流送是互联网视频和音频内容的一种形式的多媒体传递――称为多媒体内容、媒体内容、媒体服务等等。在HTTP流送中，多媒体文件可以被分割成一个或多个分段，并且使用HTTP协议被传递至客户端。基于HTTP的多媒体内容传递(流送)由于以前广泛采用了HTTP以及其底层协议(传输控制协议/互联网协议(TCP/IP)协议)，因此提供了可靠的和简单的内容传递。基于HTTP的传递通过避免网络地址转换(NAT)和防火墙穿越问题而允许容易和不费力的流送服务。流送数据的基于HTTP的传递也可以提供使用标准HTTP服务器和高速缓冲来代替专用流送服务器的能力。基于HTTP的传递由于在服务器端的最少的或减少的状态信息而可以提供可扩展性。HTTP流送技术的示例可以包括微软公司IIS平滑流送、苹果公司HTTP实况流送以及Adobe公司的HTTP动态流送。
HTTP上动态自适应流送(DASH)是一种自适应多媒体流送技术，其中多媒体文件可以被分割成一个或多个分段并且使用HTTP被传递至客户端。DASH为媒体演示描述(MPD)元数据文件指定格式，该媒体演示描述(MPD)元数据文件提供了与服务器中存储的媒体内容表示的结构以及不同版本以及分段格式有关的信息。例如，元数据文件包含与媒体播放器的初始化和媒体分段有关的信息(播放器查看初始化分段以理解容器格式和媒体定时信息)，以确保多个分段到媒体演示时间线的映射以用于切换、以及与其他表示的同步演示。DASH客户端可以通过一系列HTTP请求－响应事物来下载多个分段，来接收多媒体内容。DASH可以提供在可用带宽变化时在媒体内容的不同比特率表示之间进行动态切换的能力。由此，DASH可允许快速适应于变化的网络和无线链路条件、用户优选项和设备能力，诸如显示器分辨率、所采用的计算机处理器的类型或者可用存储器资源的数量。DASH是可用于解决基于实时协议(RTP)和基于RTSP流送以及基于HTTP的渐进式下载的弱点的一种示例技术。基于DASH的自适应流送在第三代合伙人计划(3GPP)技术规范(TS)26.247发布(包括发布10、11和12)以及运动图像专家组(MPEG)ISO/IEC DIS 23009-1中被标准化，该基于DASH的自适应流送是对基于RTSP的自适应流送的替代方法。
在DASH中，媒体演示描述(MPD)元数据文件提供了与服务器中存储的媒体内容表示的结构和不同版本有关的信息。表示可以是对在给定时间段内多媒体内容分量的完整集合或子集的替代物。表示可以开始于一时间段的开始处，继续到该时间段的结束，或者在MPD的结束处开始。表示可以包括一个或多个多媒体流。每个多媒体流可以是一个多媒体内容分量的已编码版本。表示可由一个或多个分段组成。表示可以包含初始化分段或多媒体分段。表示可以是自初始化的，其中分段可以符合为该表示指定的或定义的媒体类型。
在DASH中，客户端可能希望在媒体内容中的任一时刻在适应集合中的表示之间切换。适应集合可以包含一个或多个表示。客户端可以基于不同的多媒体内容特性或属性在适应集合内从一个表示切换至另一个表示。不同的多媒体特性或属性可以包括：语言、多媒体内容类型、角色、可存取性、观点、评级、带宽、视频宽度、视频高度和帧速率。多媒体特性或属性的值可以在该一个或多个表示的适应集合中提供。适应集合可以基于组特性或属性被安排到多个组中。
然而，由于被用于对表示内的媒体进行压缩所使用的编解码器的编码依存关系以及其他因素，因此在任意位置处切换可能是复杂的。期望避免下载重叠的数据，即，来自多个表示的同一时间段的媒体。通常，切换在新流中的随机接入点处最简单。为了使关于切换的要求正式化，DASH可以定义流接入点(SAP)的编解码器独立的概念，并且标识各类流接入点。SAP是一表示中的时间独立的位置，该表示允许仅使用从SAP向前的位置(在那之前是在初始化分段中初始化数据，如果有的话)开始的表示数据中包含的信息来开始媒体流的回放。
媒体的多个不同版本可以被存储于服务器中，如前所述，包括具有不同的比特率、帧速率、分辨率、编解码器类型等的多个版本。DASH还指定分段格式，即，包含与媒体引擎的初始化和媒体分段有关的信息。媒体引擎可以查看初始化分段以了解容器格式和媒体定时信息。DASH格式化可用于将多个分段映射至媒体演示时间线供切换以及与其他表示的同步演示。
当多个分段从服务器被流送至移动无线设备时，即便在内容质量、比特率、帧速率、分辨率或其他参数中可能出现变化，DASH也允许流送媒体在移动无线设备上的连续回放。
基于描述分段关系以及分段如何形成媒体演示的MPD元数据信息，在移动无线设备上工作的客户端可以使用诸如HTTP GET或部分GET方法这样的命令来请求这些分段，移动无线设备诸如用户设备(UE)或移动站(MS)。客户端可以控制流送会话。例如，客户端可以通过潜在地调节比特率、压缩类型、帧速率或其他期望属性，来管理分段序列中的准时请求和平滑播放。属性可以变化，例如以便对设备状态或用户优选项的变化作出反应。
此外，DASH可以提供在可用带宽或无线链路质量变化时在媒体内容的不同比特率表示之间进行动态切换的能力。因此，DASH允许更快适应于变化的网络和无线链路条件、用户优选项和设备能力(例如，显示器分辨率、CPU、存储器资源等)。这种动态适应提供较好的用户体验质量(QoE)，且具有较短启动延迟和较少重新缓冲事件。
在3GPP TS 26.346发布(包括发布6-12)中指定的多媒体广播多播服务(MBMS)是在根据3GPP所发布的蜂窝标准之一工作的蜂窝网络上使用的点到多点系统。它是为了基于广播和多播技术将流行内容有效传递至许多接收者而设计的，并且在3GPP通用移动电信系统(UMTS)规范的发布六中首次被介绍作为任选的特征。MBMS在以后的3GPP发布中基于几个增强被进一步优化，几个增强诸如多播广播单频率网络(MBSFN)功能。在服务层，MBMS还基于传输层协议、基于用户数据报协议(UDP)来为多媒体内容的流送传输以及文件的可靠下载两者定义传递协议，使用实时传输协议(RTP)来进行流送传输、以及使用单向传输上文件传递(FLUTE)来进行文件传递。MBMS接入客户端可以经由用户服务发现(USD)信令从服务器(已知为广播单播服务中心(BMSC))接收媒体数据和元数据。在与3GPP发布八及往后发布相对应的基于3GPP的长期演进(LTE)标准开发中，MBMS已经被用作演进的MBMS(eMBMS)模式。
DASH格式化的内容可以使用MBMS下载传递方法和/或基于HTTP的传递方法被传递至UE。基于MBMS的DASH传递选项在一些服务区域中可能不可用，在这些情况中那些服务可能经由单播交替地提供。在MBMS上DASH格式化的内容传递的情况下，可以使用FLUTE传输协议。FLUTE在互联网工程任务组(IETF)请求注解(RFC)3926和RFC 6726中定义，FLUTE许可在MBMS上传递DASH分段，使得客户端观察到它们在HTTP/TCP上被传递。HTTP统一资源定位符(URL)被指派给FLUTE中的每一个所传递的对象，HTTP-URL将分段URL映射到MPD中。UE可以基于MPD中包含的HTTP URL与FLUTE分组中包括的URL信息之间的比较来标识接收到的DASH表示。
HTTP流送和DASH可以被配置为单播通信。随着3GPP长期演进(LTE)网络的使用继续增长，演进的多媒体广播和多播服务(eMBMS)的部署提供了几个好处。eMBMS的一个好处在于多播下载传递是用于卸载基于HTTP的单播下载传递的有吸引力的服务替代方案。多播下载传递的使用可以更为有效，特别是在具有较高用户密度的区域中，诸如城市区域、大学城、体育赛事、度假村等等。
不同的DASH表示可以在单播/HTTP和MBMS/FLUTE上可用，要求用于接入DASH内容的不同版本的交换机。单播/HTTP和MBMS/FLUTE之间的切换情况可以发生在这些场景中，包括具有接入变化的用户发起的内容切换以及应用发起的接入变化。概言之，客户端可能在内容流送传输期间在单播和多播/广播接入方法之间切换，此外特定的DASH格式化的分量(表示、分段等)可以在多播/广播上被接收，其他分量可以在单播上被接收，它们在客户端处同步。
已知对于DASH格式化的内容的单播/HTTP和广播/FLUTE接入方法的可用性，重要的是确保对于整个内容流送传输的持续性和一致的用户体验。
按照本发明一实施例，可以配置SAP来允许单播－广播切换。SAP可用在单播以及广播/多播传递环境中。对于单播传递环境，每个客户端建立单个会话以传递内容。在多个客户端、且每个客户端想要相同媒体内容的情况下，可以为每个客户端使用单个单播会话。单播的好处在于它提供按每个客户端来适配每个会话的能力。然而，当想要相同内容的多个客户端按每个客户端建立单个会话时可能是低效的、有负担的，并且可能导致多个服务器传递流送内容以及无线网络话务的可扩展性问题。在存在想要相同内容的多个用户时，广播传递环境可能是期望的。
对于3GPP配置的设备，eMBMS提供标准化协议来进行广播传递。广播传递提供了一种无需按客户端建立单个会话而将内容中继至多个用户的标准化方法。然而，在一些环境和/或位置中，广播内容传递可能不可用。广播提供商可能仅在可调节尺寸的用户或客户端所处的位置或环境中提供广播服务。这种位置可以包括诸如机场、商场、大学校园等位置。广播服务可以在相对大量的客户端和/或用户通常使用诸如智能电话、平板、膝上型电脑等移动设备接收内容的位置被提供。
用户可能在不提供广播内容传递的位置或区域开始接收单播的流送内容，稍后移至广播内容传递可用的位置。此外，随着给定用户或客户端移动位置或者取决于网络能力，该给定用户或客户端的链路质量可能改变。在一示例中，用户设备可最初连接至具有较低质量内容的单播或广播会话，较低质量内容诸如标准清晰度内容。然而，当用户设备移动位置或网络负载降低时，可以使诸如高清晰度内容这样的高质量内容可用。在链路质量改进时，高质量内容可以通过不同的链路或相同的链路被提供。客户端、用户或用户设备然后可以确定要切换，或者用户设备可以自动地从单播连接切换至诸如eMBMS这样的广播连接。由于客户端和用户优选无缝的内容传递，因此单播和广播内容传递方法之间的无缝切换是期望的。
不同的流送内容可以基于诸如内容格式、质量、分辨率之类的情况而被不同地编码。在一实施例中，流送内容可以是视频、音频、数据、文本、图像、动画、交互式内容、或者其他类型的多媒体内容。取决于内容编码，在媒体内容中引入不同的时间低效性。在一实施例中，服务提供商、服务器或客户端可以利用时间低效性，并且同步单播和广播传递服务之间的切换。
eMBMS的使用可以提供附加好处，包括允许支持新的非实时服务类型、供应补充eMBMS流送服务的内容、以及平衡设备上增长的存储容量。在LTE网络上实现eMBMS可以提高其核心eMBMS用户服务特征的性能和可用性。
在一实施例中，DASH格式的内容可以用单向传输文件传递(FLUTE)协议，使用eMBMS下载传递被发射。FLUTE允许通过eMBMS传递多个分段，使得客户端观察到它们通过HTTP/传输控制协议(TCP)被传递。HTTP统一资源定位符(URL)可以被指派给FLUTE中的每一个所传递的对象，HTTP-URL将分段URL映射到MPD中。
客户端(诸如3GPP LTE配置的用户设备(UE)(发布8或较迟))可以基于MPD中包含的HTTP URL与FLUTE分组中包括的URL信息之间的比较，来标识接收到的DASH表示。在DASH中，媒体内容可以以预定义的或期望的压缩级别被转换代码或编码。
要被无线传送的媒体的不同压缩级别可能基于媒体内容、表示、比特率、帧速率、分辨率、编解码器类型等等是期望的。
SAP允许在诸个SAP接入点接入(诸个)媒体流的容器。容器可以包含多于一个媒体流。每个流可以使特定媒体类型的连续媒体的已编码版本。在一实施例中，编码器可以对媒体数据上下文编码，媒体数据上下文包括所选数量的视频帧。可以生成媒体数据上下文的多个已编码表示。输入媒体数据上下文的至少一部分可以被包括在第一已编码表示中。同一部分也可以被包括在多个已编码表示的第二已编码表示中。第一已编码表示可以根据与对第二已编码表示进行编码所用的一组编码参数有所不同的一组编码参数来编码。然后，已编码表示可以被分段成所选的分段尺寸以用于使用DASH无线传输至无线设备(诸如UE)。至少一个SAP可以被插入输入媒体数据上下文的每个已编码表示的分段中的位置处，该位置允许UE在SAP处流送数据的单播传递和流送数据的多播传递之间切换。这将在接下来的段落中更完整地讨论。
如以前讨论的，SAP是容器中的位置，该位置允许回放所标识的媒体流以便仅使用以下启动：(a)容器中包含的从该位置之后的信息、以及(b)来自容器的(诸个)其他部分的可能的初始化数据。
DASH标准为图片公开组(GOP)和封闭式GOP随机接入点两者指定SAP。GOP可以定义具有所使用帧类型的模式。在一实施例中，封闭式GOP不包含引用前一GOP或下一GOP中的帧的任何帧。公开GOP可能具有引用前一或下一GOP中的帧的一个或多个帧。在一实施例中，封闭式GOP可能包含比具有相同长度的公开GOP要更多的帧。在该实施例中，公开GOP可能和具有相同结构和尺寸的封闭式GOP相比，提供较好的压缩。
如此处使用的，除非另外注明，术语“SAP”、“单播SAP”、“多播SAP”或“eMBMS SAP”是指表示中时间独立的位置，该位置被选择以允许在单播连接和多播连接(诸如eMBMS/FLUTE会话)之间切换，允许仅使用在表示数据中所包含的从SAP的位置之后(在那之前是在初始化分段中初始化数据，若有)的信息而启动媒体流的回放。
在一实施例中，服务提供商或服务器可以被配置成在UE上运行的客户端切换会话之前，向该客户端提供切换信息。切换信息可以包括单播和/或广播会话的可用性、内容质量、比特率、帧速率、分辨率等等。服务提供商可以选择SAP点并将它们传送至客户端。然后，客户端可以确定是否要或者何时要基于切换信息来切换会话。通过在客户端切换之前向客户端提供切换信息，避免了切换不确定性和回放中断。
此外，避免了内容传递的重叠，因为客户端、服务器和/或服务提供商在会话切换之前知道何时会发生会话切换。
例如，流送服务器可以被配置成标识客户端将在预定的SAP处切换会话。服务器还可以被配置，使得它不发送或发射单播会话的客户端将在广播会话上接收的部分。在一实施例中，UE可以发起在从单播会话到广播会话、或者在多个单播或广播会话之间之上的切换或转移。在另一实施例中，UE或客户端可以在预定时间处或之前加入或决定加入广播或单播会话。在另一实施例中，UE或客户端可以在会话的下一SAP前的预定时间加入或决定加入广播或单播会话。
在另一实施例中，单播和eMBMS/FLUTE会话的每一个可以是可连接至客户端和由客户端解码的独立会话，该客户端诸如在UE上运行的客户端。在一实施例中，每个会话中的SAP可以在不同会话的相同内容点被同步或对齐。由于每个会话是独立的，因此客户端不需要已经接收到或者知道在先会话期间发生了什么。
在一实施例中，要在多个会话之间切换的时间长度取决于内容如何被编码。例如，对于每秒30个帧的内容使用SAP用于在多个会话间切换的时间长度(即，切换时间)可以是15个帧、或近似0.5秒。然而，实际切换时间可以取决于除了每秒帧数以外的多个因素，包括用于压缩媒体的编解码器的类型。
切换时间可以从几毫秒变化至几秒。
会话的编码可以是时间相关的。为了解码流送媒体，可能需要在解码其他帧之前解码具有时间相关媒体的特定帧。在一实施例中，eMBMS顺序数据可以在DASH MPD中被发射。在实施例的还有一方面，eMBMS顺序数据可以以定期间隔被发射。这将在接下来的段落中更完整地讨论。
在另一实施例中，单播SAP和eMBMS SAP可用于允许客户端(诸如在UE上运行的客户端)从最初通过单播/HTTP会话接收数据无缝地切换至通过一个或多个同步的eMBMS/FLUTE会话来接收数据。
无缝切换允许UE无缝地接收数据，而不丢失流送数据的帧。在该实施例中，从单播传递到eMBMS传递的无缝切换可以使用eMBMS顺序框架来完成。在该实施例中，客户端可以通过单播/HTTP会话接收数据的第一部分(诸如流送数据)，并且通过一个或多个eMBMS/FLUTE会话接收数据/流送媒体的第二部分。
在一实施例中，可以使用多个流送eMBMS/FLUTE会话。在UE上运行的客户端可以基于eMBMS顺序框架跨多个交替的eMBMS/FLUTE会话而接收数据。无缝切换由同步的多个顺序的eMBMS/FLUTE会话启用，使得多个eMBMS/FLUTE之一可以在任一时间点发射第二数据的一部分达预定时间段，而多个eMBMS/FLUTE会话中的另一个可以发射第二数据的后一部分。客户端可以被配置成调谐至同步序列，从而保存DASH流送的连续性。这将在接下来的段落中更完整地讨论。
在另一实施例中，单播－广播切换的SAP可以被包括在DASH MPD中，并且可以连同包括eMBMS顺序信息。或者，排序或切换信息也可以被包括在eMBMS用户服务描述(USD)中。在本发明一实施例中，对于不同DASH表示之间的随机接入，单播－广播切换SAP可符合现有的DASH级别的SAP。SAP信息也可以通过DASH客户端和eMBMS/FLUTE客户端之间的接口在UE内携带。
在广播内容传递的一个实施例中，SAP点对于服务提供商、服务器和/或服务器上运行的客户端来说可能是先验已知的。然而，单播服务提供商、服务器和/或客户端所使用的SAP点可能对应于广播服务提供商或服务器的SAP点，或者可能与广播服务提供商或服务器的SAP点不同步。在一实施例中，服务提供商、服务器或客户端可以对单播和多播提供商的多个SAP进行同步，以便在单播和广播或者基于eMBMS的内容传递之间提供无缝切换。
在从单播和广播或基于eMBMS的内容传递切换时使用SAP允许服务器控制用户或客户端在单播和广播传递方法之间切换的时间点。在一实施例中，服务器或服务提供商为了在给定SAP处切换至广播或eMBMS连接的客户端或用户设备，向客户端或用户设备提供广播或基于eMBMS的内容传递。通过提供到客户端或用户设备的广播或基于eMBMS的内容传递的可用性，显著减少或移除了连接可用性的不确定以及回放的中断。此外，用户设备或客户端可以避免经由单播连接取回它将在单播或广播连接上接收的内容，从而移除内容重叠和内容传递低效性。
几个示例和图示在接下来的段落中描述，几个示例和图示关于SAP在单播和广播连接之间切换的创建和使用。这些示例不意图是限制性的。
图1是说明DASH客户端在流送数据的SAP处在单个单播连接和单个多播连接之间变化的一实施例的时间线示意图。在SAP 1(102)，UE经由单个单播连接106接收媒体流。在SAP 2(104)，UE停止经由单播连接106接收媒体流，并且开始经由单个多播连接108接收媒体流。
图2是说明DASH客户端在单播连接210和两个多播连接(多播连接A212和多播连接B 214)之间变化的另一实施例的示例的时间线示意图。
在图2中的SAP 1(202)处，UE或者UE上运行的客户端可以经由单播连接210接收媒体流。在SAP 5(206)，UE或客户端停止经由单播连接210接收媒体流，并且开始经由多播连接B 214接收媒体流。然后，UE或客户端经由交替的多播连接接收媒体流。在一个图示示例中，UE或客户端可以经由SAP 5(206)和SAP 6(208)之间的多播连接接收媒体流。然后，UE或客户端可以切换至经由SAP 6(208)和SAP 7(220)之间的多播连接A接收媒体流。UE或客户端可以在每个SAP处、在预定义的SAP处、或者在UE或客户端期望时在多个多播连接之间交替或切换。
在另一实施例中，随着客户端或用户移动位置或者网络负载改变，可能有不同的内容质量级别可用，不同质量的链路对于客户端可用。此外，链路质量可以在单播和广播会话之间以及/或者在多个广播或单播会话之间变化。在一实施例中，服务提供商、服务器和/或客户端可以基于链路条件无缝地切换被传递至对于客户端或用户可用的最佳质量的内容。
在一实施例中，客户端可以在服务器处可用的多个表示之间切换。客户端可以在正在进行的流送或表示期间、基于已更新的信息在多个表示之间切换。在一实施例中，客户端可以从当前表示切换至新的表示。切换的一个示例发生在客户端表示想切换至服务器的期望之处。服务器可以被配置成定位新表示中的下一SAP。当服务器定位新表示的下一SAP时，服务器可以开始将新表示传送至客户端，且客户端可以从当前表示最近一次被呈现的点起使用新表示。在切换之际，当前媒体流送或演示可以被关闭或终止。将当前表示传送至SAP且然后切换至传送新表示允许无缝的切换，而同时使发射重复信息时丢失的信息和浪费的能量所造成的误差最小化。
在本发明一实施例中，可以执行分段和子分段以使切换更简单。例如，每个分段或子分段可以从流接入点开始，多个分段或子分段的边界可以跨适配集的多个表示而被对齐。在该示例中，切换表示包括在设备上播放流送媒体直到一个表示的分段或子分段的结束、然后从新表示的下一分段或子分段的开始起播放流送媒体。如前所讨论的，MPD和分段索引提供描述多个表示的属性以允许较简单切换的各种表示。
DASH格式化的内容可以使用MBMS下载传递和/或基于HTTP的传递两者被传递至UE。在一示例中，如以前讨论的，多播传递通常是用于在相对高密度位置中对多媒体进行流送的更有效的机制。然而，在较低人口区域中，多播服务可能不可用。从高密度位置传播至较低密度人口区域的用户可以导致从被配置用于多播的eNB(诸如eMBMS)到仅被配置用于单播的eNB的切换过程。流送媒体的从多播到单播传递或者从单播到多播传递的切换可以发生于许多情况。除了切换过程以外，eNB处的负载变化可以使eNB从多播改变至单播，或者反之亦然。
相应地，在一实施例中，当基于eMBMS的DASH传递不可用时，则流送媒体服务可以经由单播连接提供至客户端。在另一实施例中，到客户端的基于eMBMS的DASH传递可能最初是不可用的，因此服务可以经由单播最初被提供直到基于eMBMS的DASH传递变得可用，此时可以使用基于eMBMS的DASH传递来传递DASH格式化的内容。此外，多个不同的DASH表示可以通过单播/HTTP和/或eMBMS/FLUTE可用，从而允许客户端接入以及/或者在不同单播/HTTP和/或eMBMS/FLUTE DASH表示或同一表示的不同版本之间切换的能力。
在一实施例中，流送数据可以包含顺序数据。顺序数据可以被包含在指示顺序信息的数据分组中。顺序信息可以包括信息，信息诸如单播和/或多播连接的可用性、连接的排序、每个连接将接收媒体流的时间长度、以及/或者DASH客户端将最初开始接收媒体流的连接。
例如，顺序数据可以指定：两个同步的会话(单播和多播会话)将发射多媒体流；多媒体流将最初通过单播连接开始发射而同时多播连接最初空闲；以及在预定的或已定义的SAP处、DASH客户端将切换至多播连接。在该示例中，在SAP 5(206)处，客户端被配置成通过多播连接开始接收媒体流。在SAP 5(206)处，单播连接变得空闲或终止。DASH客户端可以进一步建立：媒体流将继续通过多播会话被接收，直到预定的SAP为止或者直到多播会话不再可用为止。在一实施例中，DASH客户端可以请求服务器在切换至多播连接时停止通过单播连接发射。
图3说明了单播连接和多个多播连接之间的变化。在SAP 1(302)处，UE或客户端可以经由单播连接接收媒体流。在SAP 3(304)处，UE或客户端可以停止经由单播连接接收媒体流，并且开始经由多个多播连接接收媒体流。在一实施例中，DASH客户端可以建立：媒体流将继续通过多播会话被接收，直到预定的SAP为止或者直到多播会话不再可用为止。
图4描述了从单播/HTTP会话到多个eMBMS会话的同步和切换。图4进一步描述了两个eMBMS/FLUTE会话的同步。单播/HTTP和eMBMS/FLUTE表示之间的切换可以发生在例如：具有接入变化的用户发起的内容切换以及应用发起的接入变化。在一实施例中，客户端或UE可以在内容流送期间在单播和广播传递模式之间切换。
更具体而言，图4说明了单播连接410和两个多播连接之间的变化：多播连接B 414和多播连接A 412。在SAP 1(402)处，UE或客户端可以经由单播连接410接收媒体流。在SAP4(404)处，UE或客户端可以停止经由单播连接410接收媒体流，并且开始经由多播连接B414接收媒体流。在一实施例中，多播连接B 414是用于标准清晰度(SD)分辨率媒体内容的连接。UE或客户端可以经由SAP 4(404)和SAP 6(406)之间的多播连接B 414接收SD分辨率流送媒体内容。然后，在SAP 6(406)处，UE或客户端可以经由多播连接A 412切换至接收高清晰度(HD)分辨率流送媒体内容。在一实施例中，UE或客户端可以在每个SAP或在预定义的多个SAP处，在多播分辨率连接(诸如SD和HD)之间切换。
图5说明了单播连接和多个SD和HD多播连接之间的变化。在SAP 1(502)处，UE或客户端可以经由单播连接接收媒体流。在SAP 3(504)处，UE或客户端可以停止经由单播连接接收媒体流，并且开始经由多个SD分辨率多播连接接收媒体流。在SAP 6(506)处，UE或客户端可以停止经由SD分辨率多播连接接收媒体流，并且开始经由多个HD分辨率多播连接接收媒体流。
在另一实施例中，图6说明了两个多播连接(多播连接A 602和多播连接B 604)之间的变化。在SAP 1(606)和SAP 2(608)之间，UE或客户端可以经由多播连接A 602接收媒体流。在SAP 2(608)和SAP 3(610)之间，多播连接A 602空闲，而同时UE或客户端经由多播连接B 604接收媒体流。在SAP 3(610)和SAP 4(612)之间，多播连接B 604空闲，而同时UE或客户端经由多播连接A 602接收媒体流。在SAP 4(612)和SAP5(614)之间，多播连接A 602空闲，而同时UE或客户端经由多播连接B 604接收媒体流。在该实施例中，在客户端或用户设备经由一个多播连接接收流送数据或多媒体内容的同时，另一多媒体连接保持空闲。在本发明另一实施例中，多个多播连接可以闲置，而同时客户端或用户设备从多播连接接收流送数据或多媒体内容。
在一实施例中，广播单播服务中心(BMSC)服务器可以使用多个eMBMS/FLUTE会话中的一个或多个，在任一时间点发射数据达一预定时间段。多个eMBMS/FLUTE会话上的这种eMBMS排序允许BMSC在各个eMBMS/FLUTE会话上交替地发射数据。在一实施例中，广播和eMBMS/FLUTE会话之间的切换以及第一和第二eMBMS/FLUTE会话之间的切换发生在特定的SAP处。
在一实施例中，服务提供商或服务器可以对通过广播发送DASH格式化的分量(诸如表示和分段)与通过单播发送其他分量进行同步。或者，客户端可以对通过广播接收特定DASH格式化的分量(诸如表示和分段)和通过单播接收其他分量之间进行同步。在可以从不同的单播/HTTP和/或广播/FLUTE传递选项接收DASH格式化的内容的情况下，在发送和/或接收内容时可能有延迟或时间差异。在同步内容时，客户端和/或服务器可以考虑并调节在通过单播/HTTP和通过eMBMS/FLUTE接收或发送内容的延迟差异，以避免媒体回放的中断并且确保对于整体内容流送的连续性和一致的用户体验。在一实施例中，用户的连续性和一致性是在UE上显示流送多媒体内容和/或数据并且在单播和eMBMS连接之间改变、而无须用户注意到显著变化的能力。显著变化是将流送多媒体内容的观看质量降低至普通人的变化。
通过使用SAP在单播和基于eMBMS的内容传递之间切换，服务提供商可以同步单播和基于eMBMS的内容，并且将客户端引导至在媒体演示期间在特定的SAP处切换。通过引导DASH客户端，服务提供商能够在单播和广播传递模式之间提供无缝切换，从而确保内容的无中断回放。SAP信息可以被包括在DASH MPD或eMBMS用户服务描述(USD)中。
在一实施例中，服务提供商可以定义或选择至少一个特定的SAP，作为在给定的单播/HTTP会话和给定的eMBMS/FLUTE会话之间切换的点。通过定义或选择至少一个特定的SAP，DASH格式化的内容切换的无缝传递在给定的单播/HTTP会话和给定的eMBMS/FLUTE会话之间的切换时发生。在一实施例中，服务提供商可以通过给定的eMBMS/FLUTE会话来发送DASH格式化的内容或表示的不同版本，以便补偿或弥补与SAP处的切换相关联的延迟/时间线。
在本发明一实施例中，UE上运行的客户端可以从最初通过单播/HTTP会话接收流送数据无缝地切换至同时从多个eMBMS/FLUTE会话接收数据。在本发明另一实施例中，客户端可以从最初通过单播/HTTP会话接收数据无缝地切换至通过一个或多个eMBMS/FLUTE会话顺序地或连续地接收数据。
图7说明了多个多播连接之间的变化。在SAP 1(702)处，UE或客户端可以经由单播连接A接收媒体流。在SAP 2(704)处，UE或客户端可以停止经由单播连接A接收媒体流，并且开始经由多播连接B接收媒体流。在SAP 3(706)处，UE或客户端可以停止经由多播连接B接收媒体流，并且开始经由多播连接C接收媒体流。在SAP 4(708)处，UE或客户端可以停止经由多播连接C接收媒体流，并且开始经由多播连接D接收媒体流。在SAP 5(710)处，UE或客户端可以停止经由多播连接D接收媒体流，并且开始经由多播连接A接收媒体流。在SAP 6(712)处，UE或客户端可以停止经由多播连接A接收媒体流，并且开始经由多播连接B接收媒体流。在SAP 7(714)处，UE或客户端可以停止经由多播连接B接收媒体流，并且开始经由多播连接C接收媒体流。在SAP 8(716)处，UE或客户端可以停止经由多播连接B接收媒体流，并且开始经由多播连接C接收媒体流。在SAP 9(718)处，UE或客户端可以停止经由多播连接C接收媒体流，并且开始经由多播连接D接收媒体流。
在另一实施例中，UE或客户端可以以任何次序或顺序在多个多播连接之间切换。
图8描述了无线通信中用于在单播和多播流送之间切换的过程。在该过程中，在UE上运行的DASH客户端可以接收流送数据。在步骤802处，DASH客户端请求从HTTP服务器接收多个分段的流送数据。在步骤804处，DASH客户端经由单播连接从HTTP服务器接收多个分段。在另一实施例中，DASH客户端可以经由单播连接和与至少一个演进节点B(eNodeB)的eMBMS之一从HTTP服务器接收多个分段。在步骤806处，DASH客户端在流送数据的SAP处，请求单播连接和eMBMS连接之间的改变。
在一实施例中，DASH客户端可以被配置成从HTTP服务器接收同步信息，并且基于同步信息来确定在哪个SAP从单播会话改变为eMBMS会话。在另一实施例中，同步数据包含在DASH MPD中接收到的至少一个HTTP-eMBMS同步SAP以便提供在单播连接和eMBMS连接之间流送数据的同步点。在另一实施例中，SAP发生在从HTTP服务器接收到的两个分段之间。在另一实施例中，DASH客户端被配置成通过eMBMS连接接收具有不同数据格式的多个分段。
在另一实施例中，DASH客户端可以被配置成接收来自单播连接的流送数据的至少一个分量以及来自eMBMS连接的流送数据的至少一个分量。在另一实施例中，DASH客户端被配置成基于eMBMS顺序数据经由eMBMS连接接收多个分段。在另一实施例中，DASH客户端被配置成从多个交替的eMBMS会话接收多个分段。在另一实施例中，DASH客户端被配置成无缝地接收来自单播连接的第一分段以及来自eMBMS连接的第二分段。在另一实施例中，DASH客户端被配置成在为用户提供连续性的同时，回放来自单播连接的第一分段以及来自eMBMS连接的第二分段。在另一实施例中，DASH客户端被配置成接收eMBMS顺序数据并且基于eMBMS顺序数据在多个eMBMS连接之间变化。
图9描述了在UE上运行的DASH客户端处、用于从通过单播连接接收媒体流切换至通过多播连接接收媒体流的本发明一实施例。在步骤902处，DASH客户端请求从服务器接收多个分段的流送数据。在步骤904处，DASH客户端经由单播连接从HTTP服务器接收多个分段。在另一实施例中，DASH客户端可以经由单播连接和与至少一个演进节点B(eNodeB)的eMBMS之一从HTTP服务器接收多个分段。在步骤906中，DASH客户端确定多播连接是否在预定的SAP或下一SAP处可用。如果多播连接不可用，则DASH客户端在步骤908维持单播连接。如果多播连接在预定的或下一SAP处可用，则在步骤910中，DASH客户端请求在该预定的或下一SAP处从单播连接变化至eMBMS连接。在步骤912中，DASH客户端经由eMBMS连接接收数据分段。在步骤914中，DASH客户端终止单播连接。
图10用流程图描述了本发明的另一实施例，该流程图说明了在DASH客户端处、从通过多播连接接收媒体流切换至通过不同的多播连接接收媒体流。在步骤1002中，DASH客户端请求从服务器接收多个分段的流送数据。在步骤1004处，DASH客户端用至少一个eNodeB、经由eMBMS连接从服务器接收多个分段。在步骤1006中，DASH客户端确定第二eMBMS连接是否在预定的或下一SAP处可用。如果附加的eMBMS连接不可用，则DASH客户端在步骤1008维持原始eMBMS连接。如果第二eMBMS连接在预定的或下一SAP处可用，则在步骤1010中，DASH客户端请求在该预定的或下一SAP处从原始eMBMS连接变化至第二eMBMS连接。在步骤1012中，DASH客户端经由第二eMBMS连接接收数据分段。在步骤1014中，DASH客户端终止原始eMBMS连接。
图11说明了用于将流接入点(SAP)插入输入媒体数据上下文的多个已编码表示中的方法1100。如此处使用的，术语“输入媒体数据上下文”包括输入媒体顺序。在一实施例中，输入媒体序列可以包括数字视频的多个帧或其他所选部分。在另一实施例中，输入媒体序列可以包括数字音频。可以理解，数字视频和数字音频可以被配置成允许通过无线连接来流送传送音频和/或视频序列。输入媒体序列还可以包括可通过无线连接流送传送的数字视频和数字音频两者。
如框1102所示，方法1100包括将输入媒体数据上下文提供至编码器。如框1104所示，输入媒体数据上下文可以用编码器来编码，以生成输入媒体数据上下文的多个已编码表示。
输入媒体数据上下文的至少一部分可以被包括在多个已编码表示的第一已编码表示中。同一部分也可以被包括在多个已编码表示的第二已编码表示中。第一已编码表示可以根据和对第二已编码表示进行编码所用的编码参数不同的一组编码参数来编码。
如框1106所示，方法1100还包括将输入媒体数据上下文的已编码表示分段成所选的分段尺寸，用于使用超文本传输协议(HTTP)上的动态自适应流送(DASH)作为流送数据无线传输至用户设备(UE)。如框1108，至少一个流接入点(SAP)可以被插入输入媒体数据上下文的每个已编码表示的分段中的位置处，该位置允许UE在SAP处流送数据的单播传递和流送数据的多播传递之间切换。可以选择SAP的位置以便使流送数据在仅使用SAP之后接收到的信息进行的切换之后，在UE处被解码。
在一示例中，SAP可以允许UE在使用分段中包含的初始化数据进行单播－广播切换之后维持输入媒体数据上下文的回放，以减少由切换造成的任何不连续性或回放中断。在另一示例中，在已编码表示的传输之前，与已编码表示中的至少一个SAP的位置有关的信息被发信号通知UE。在一示例中，输入媒体数据上下文的不同已编码表示包括对具有不同比特率、帧速率、分辨率或编解码器类型的数据进行编码。
在一示例中，至少一个SAP的位置可以在要被发送至实况演示的媒体分段中被动态生成和更新。已更新的位置可以在已编码表示的传输之前被发信号通知UE。在另一示例中，可以将不同已编码表示的至少一个SAP位置选择为处在相对于每个已编码表示中的所选视频帧的相同位置。
或者，可以将不同已编码表示的至少一个SAP位置选择为处在每个已编码表示中的所选媒体时间。将至少一个SAP位置在每个不同的已编码表示中置于同一位置，无论是相对于特定视频帧还是所选的媒体时间，允许UE上运行的客户端在维持UE处显示的媒体的连续性的同时，在SAP位置处的不同已编码表示之间切换。在另一示例中，输入媒体数据上下文和至少一个SAP的位置信息可以被保存在多个服务器上，用于使用DASH以及使用单播传递和多播传递之一传输至UE。
图12说明了用户设备(UE)以及单播和多播服务器之间的通信的示例。在本发明的该实施例中，UE 1206上运行的DASH客户端1214可以直接或间接从多个服务器接收流送媒体内容。在一实施例中，DASH客户端1214可以经由DASH客户端1214和HTTP服务器1210之间的单播连接1204直接接收流送媒体内容。在另一实施例中，DASH客户端1214可以经由DASH客户端1214和MBMS服务器1214之间的多播连接1206直接接收流送媒体内容。在本发明另一实施例中，DASH客户端1214可以经由中间连接1208间接地接收流送媒体内容，其中HTTP服务器1210和/或MBMS服务器1212通过该中间连接1208将流送媒体内容发射至DASH客户端1214。
中间连接1208可以是节点。在3GPP无线电接入网络(RAN)LTE系统中，节点可以是演进的通用地面无线电接入网络(E-UTRAN)节点B(也通常称为演进节点B、演进节点B、eNodeB或eNB)的组合以及无线电网络控制器(RNC)的组合，该节点可以与UE通信。下行链路(DL)传输可以是从节点(例如，eNodeB)到无线设备(例如，UE)的通信，上行链路(UL)传输可以是从无线设备到节点的通信。节点可以包括基站(BS)、节点B(NB)、eNB、基带单元(BBU)、远程无线电头(RRH)、远程无线电设备(RRE)、远程无线电单元(RRU)或者中央处理模块(CPM)。
在UE以及单播和多播服务器之间的通信系统的一个实施例中，用于内容流送传输的通信系统包括：(1)HTTP服务器1210通过单播会话发射数据，其中单播会话发射用于在单播和eMBMS传递(例如，在DASH MPD中)之间切换的一个或多个SAP；(2)HTTP服务器1210响应于来自DASH客户端1214的请求而在被允许在单播和多播流送之间切换的下一SAP处停止通过单播会话发射数据；以及(3)BMSC或MBMS服务器1212通过多个同步的eMBMS/FLUTE会话发射数据，其中BMSC或MBMS服务器1212按照多个eMBMS/FLUTE会话之间的eMBMS顺序数据来对数据传输排序。
尽管HTTP服务器1210和MBMS服务器1212被图示为两个不同的服务器，但是这并非是限制性的。对于UE 1202上运行的客户端1214的HTTP单播连接和eMBMS多播连接可以如图12所示始发自不同的服务器，或者始发自同一服务器。或者，可以使用单个服务器来将多个分开的服务器虚拟地宿主于同一物理设备上。
例如，图13说明了服务器(诸如多媒体或数据服务器)和用户设备(UE)之间的通信的实施例。在本发明的该实施例中，UE 1302的DASH客户端1304可以直接或间接地从服务器1308无线地接收流送媒体内容。在一实施例中，DASH客户端1304可以从DASH客户端1304和服务器1308之间的单播或多播连接1306无线地接收流送媒体内容。在本发明另一实施例中，DASH客户端1304可以经由中间连接1310(诸如eNodeB或其他类型的节点)间接地无线地接收流送媒体内容，其中服务器1308通过该中间连接1310将流送媒体内容发射至DASH客户端1304。
在一实施例中，服务器1308可以是虚拟服务器或云服务器。在另一服务器中，服务器可以存储多媒体内容或其他类型的流送数据的一个或多个表示，用于广播、多播或单播传送至UE 1302上运行的DASH客户端1304。
在一实施例中，UE 1302上运行的DASH客户端1304被配置成从DASH内容服务器1308请求多个分段的流送数据。DASH客户端可以经由单播连接以及与至少一个演进节点B(eNodeB)的演进的多媒体广播和多播服务(eMBMS)连接之一从DASH内容服务器接收多个分段。DASH客户端可以在流送媒体的流接入点(SAP)处，请求单播连接和eMBMS连接之间的变化。
在一实施例中，DASH客户端进一步被配置成从DASH内容服务器接收同步信息，并且基于同步信息来确定在哪个SAP从单播会话改变为eMBMS会话。
同步数据可以包含在DASH媒体演示描述(MPD)中接收到的至少一个单播eMBMS同步SAP，以便提供在单播连接和eMBMS连接之间的流送媒体中的同步点，以维持媒体的连续回放。在一实施例中，流送媒体中的SAP可以发生在从DASH内容服务器接收到的两个分段之间的边界处。
在另一实施例中，DASH客户端可以进一步被配置成通过eMBMS连接，执行到多个单向传输上文件传递(FLUTE)会话的单播-到-广播切换，以及从多个单向传输上文件传递(FLUTE)会话接收多个分段。
在一实施例中，DASH客户端可以进一步被配置成接收来自单播连接的流送媒体的至少一个分量以及来自eMBMS连接的流送媒体的至少一个分量。
在另一实施例中，DASH客户端还被配置成基于eMBMS顺序数据、经由eMBMS连接，通过多个单向传输上文件传递(FLUTE)会话接收多个分段。DASH客户端可以从多个交替的eMBMS会话接收多个分段。DASH客户端可以无缝地接收来自单播连接的第一分段以及来自eMBMS连接的第二分段。
在一实施例中，DASH客户端可以在为用户提供连续性的同时，回放来自单播连接的第一分段以及来自eMBMS连接的第二分段。DASH客户端可以接收eMBMS顺序数据并且基于eMBMS顺序数据在多个eMBMS连接之间变化。
流送媒体中的SAP可以被动态生成并被传送至UE以提供已更新的SAP位置，使得UE可以在SAP位置处请求在单播连接和eMBMS连接之间的变化。
图14说明了被配置成向UE 1412提供流送多媒体内容的媒体服务器1402的示例。在该示例中，媒体服务器包括分段模块1404、编码模块1406和SAP插入模块1408。分段模块1404被配置成将输入媒体数据上下文的已编码表示分段为所选的分段尺寸，用于作为流送多媒体内容传输至UE1412。
编码模块1406被配置成接收输入媒体数据上下文并且编码输入媒体数据上下文，以生成输入媒体数据上下文的多个已编码表示。输入媒体数据上下文的至少一部分被包括于多个已编码表示的第一已编码表示中，同一部分也被包括于多个已编码表示的第二已编码表示中。第一已编码表示可以根据和对第二已编码表示进行编码所用的一组编码参数不同的一组编码参数来编码。
SAP插入模块1408被配置成在输入媒体数据上下文的每一个已编码表示中的位置处插入至少一个SAP，该位置允许UE 1412在该SAP处在流送传输多媒体内容的单播传递和流送传输多媒体内容的多播传递之间切换。此外，可以选择SAP的位置以便使流送数据在仅使用SAP之后接收到的信息进行的切换之后，在UE 1412处被解码。在一实施例中，UE 1412可以从UE 1412和媒体服务器1402之间的单播或多播连接1410直接无线地接收流送媒体内容。在本发明另一实施例中，UE 1412可以经由中间连接1414间接无线地接收流送媒体内容，其中媒体服务器1402通过该中间连接1414将流送媒体内容发射至UE 1312。
在另一实施例中，单播会话和eMBMS/FLUTE会话中的每一个是可以被连接至客户端并由客户端解码的独立会话。在一实施例中，SAP在不同会话的相同内容点处被同步或对齐。由于每个会话是独立的，因此客户端不需要已经接收到或者知道在先会话期间发生了什么。在一实施例中，要在多个会话之间切换的时间长度取决于内容如何被编码。在一实施例中，对于每秒30个帧的内容使用SAP用于在多个会话间切换的时间长度(即，切换时间)可以是15个帧。会话的编码是时间相关的，因此要求特定的帧在解码其他帧之前被解码。在一示例中，解码和切换会话所需的时间近似为一秒的一半。在另一实施例中，eMBMS顺序数据可以在DASH MPD中被发射。在实施例的还有一方面，eMBMS顺序数据可以以定期间隔被发射。
在另一实施例中，媒体服务器被配置成提供流送多媒体内容用于用至少一个eNodeB、使用以下之一传输至UE：通过单播连接的超文本传输协议(HTTP)服务器；以及通过演进的多媒体广播和多播服务(eMBMS)连接的单向传输上文件传递(FLUTE)服务器。
在另一实施例中，媒体服务器还被配置成：使用单播连接提供多媒体内容的第一分段用于传输至UE、以及使用演进的多媒体广播和多播服务(eMBMS)连接提供多媒体内容的第二分段。
在另一实施例中，媒体服务器被配置成提供输入媒体数据上下文的不同已编码表示，用于通过不同的单向传输上文件传递(FLUTE)会话进行传输，其中至少一个SAP被提供在输入媒体数据上下文的每一个已编码表示的分段中的位置处。
在另一实施例中，媒体服务器被配置成：经由超文本传输协议(HTTP)服务器通过单播来提供多媒体内容的第一分段；以及经由广播多播服务中心(BMSC)服务器通过演进的多媒体广播和多播服务(eMBMS)连接来提供多媒体内容的第二分段。
在另一实施例中，媒体服务器被配置成基于MBMS顺序数据对多个分段的传输进行排序。在另一实施例中，媒体服务器被配置成在单播－MBMS同步SAP处，停止通过单播会话来提供多媒体内容的第一分段。
在另一实施例中，单播SAP和eMBMS SAP被用于从最初通过单播/HTTP会话接收数据无缝地切换至通过多个同步的eMBMS/FLUTE会话接收数据。无缝切换允许UE无缝地接收数据，而不丢失流送数据的帧。在该实施例中，从单播传递到eMBMS传递的无缝切换使用eMBMS顺序框架来完成。在该实施例中，客户端通过单播/HTTP会话接收数据的第一部分、并且通过多个同步的eMBMS/FLUTE会话接收数据的第二部分，其中客户端基于eMBMS顺序框架来跨多个交替的eMBMS/FLUTE会话接收数据。无缝切换由同步的多个顺序的eMBMS/FLUTE会话启用，使得多个eMBMS/FLUTE之一可以在任一时间点发射第二数据的一部分达预定时间段，而多个eMBMS/FLUTE会话中的另一个发射第二数据的后一部分。客户端可以调谐至同步序列，从而保存DASH流送的连续性。
在另一实施例中，单播－广播切换的SAP被包括在DASH MPD中，并且可以连同包含eMBMS顺序信息。或者，顺序或切换信息也可以被包括在eMBMS用户服务描述(USD)中。在本发明一实施例中，单播－广播切换SAP可以对于不同DASH表示之间的随机接入而符合现有的DASH级别的SAP。SAP信息也可以通过DASH客户端和eMBMS/FLUTE客户端之间的接口在UE内携带。
在另一示例中，发射站可以与移动设备进行无线通信。图15提供了移动设备的示例说明，移动设备诸如用户设备(UE)、移动站(MS)、移动无线设备、移动通信设备、平板、手机或者其他类型的移动无线设备。移动设备可以包括被配置成与节点、红节点、低功率节点(LPN)或传输站进行通信的一个或多个天线，传输站诸如基站(BS)、演进节点B(eNB)、基带单元(BBU)、远程无线电头(RRH)、远程无线电设备(RRE)、中继站(RS)、无线电设备(RE)或者其他类型的无线广域网(WWAN)接入点。移动设备可以被配置成使用至少一个无线通信标准进行通信，所述至少一个无线通信标准包括3GPP LTE、WiMAX、高速分组接入(HSPA)、蓝牙和WiFi。移动设备可以为每个无线通信标准使用单独的天线或者为多个无线通信标准使用共享的天线。移动设备可以在无线局域网(WLAN)、无线个域网(WPAN)和/或WWAN中通信。
图15还提供了可用于来自移动设备的音频输入和输出的麦克风以及一个或多个扬声器的图示。显示器屏幕可以是液晶显示器(LCD)屏幕、或者诸如有机发光二极管(OLED)显示器这样的其他类型的显示器屏幕。显示器屏幕可以被配置为触摸屏。触摸屏可以使用电容性、电阻性或另一类型的触摸屏技术。应用处理器和图形处理器可以耦合至内部存储器以提供处理和显示能力。非易失性存储器端口也可用于向用户提供数据输入/输出选项。非易失性存储器端口也可用于扩展移动设备的存储器能力。键盘可以与移动设备集成，或者无线地连接至移动设备以提供附加的用户输入。虚拟键盘也可以用触摸屏来提供。
各种技术或者它们的特定方面或部分可以采取体现于有形介质中的程序代码(即，指令)的形式，所述有形介质诸如软盘、CD-ROM、硬驱、非暂态计算机可读存储介质或者任何其他机器可读存储介质，其中在程序代码被加载到机器(诸如计算机)中和由机器执行时，机器成为用于实现所述各种技术的装置。在可编程计算机上的程序代码执行的情况下，计算设备可以包括处理器、可由处理器读取的存储介质(包括易失性和非易失性的存储器和/或存储元件)、至少一个输入设备以及至少一个输出设备。易失性和非易失性的存储器和/或存储元件可以是RAM、EPROM、闪驱、光驱、磁性硬驱或者用于存储电子数据的其他介质。基站和移动站也可以包括收发机模块、计数器模块、处理模块和/或时钟模块或定时器模块。可以实现或使用此处所述的各种技术的一个或多个程序可以使用应用编程接口(API)、可再用控件等等。这种程序可以用高级的面向过程或面向对象的编程语言实现以便与计算机系统通信。然而，若需要，(诸)程序可以用汇编语言或机器语言实现。在任一情况下，语言可以是编译的或解译的语言，并且与硬件实现方式组合。
应当理解，此说明书中描述的许多功能单元已被标记为模块，以便更具体地强调它们的实现方式独立性。例如，模块可以被实现为硬件电路，硬件电路包括定制的VLSI电路或门阵列、诸如逻辑芯片、晶体管等现成的半导体、或者其他分立的组件。模块也可以在可编程硬件器件中实现，所述可编程硬件器件诸如场可编程门阵列、可编程阵列逻辑、可编程逻辑器件等等。
模块也可以用供各类处理器执行的软件来实现。具有可执行代码的已标识模块可例如包括计算机指令的一个或多个物理或逻辑块，计算机指令可以例如被组织为对象、过程或函数。然而，已标识模块的可执行文件不需要在实体上位于一起，但可以包括存储在不同位置的不同指令，这些不同指令在逻辑上连在一起时构成该模块并且实现该模块的所述目的。
实际上，具有可执行代码的模块可以是单个指令、或许多指令，并且可以甚至在几个不同的代码段上、在不同的程序之间以及跨几个存储器器件而分布。类似地，操作数据在此可以被标识或图示于模块内，并且可以以任何适当形式被体现并且被组织在任何适当类型的数据结构内。操作数据可以被收集为单个数据集，或者可以分布在不同位置上(包括分布在不同的存储器件上)，并且可以至少部分地仅作为系统或网络上的电信号而存在。模块可以是被动的或主动的，包括可用于执行期望功能的代理。
该说明中通篇引用“一示例”意指结合该示例描述的特定特征、结构或特征被包括在本发明的至少一个实施例中。因此，短语“在一示例中”在说明书各处的出现不必要全部指同一实施例。
如此处使用的，为方便起见，多个条目、结构元件、组成元件和/或材料可以被呈现在公共列表中。然而，这些列表应被视为好像该列表的每个成员都被个别地标识为单独的且唯一的成员。因此，如无相反指明，这种列表的没有一个个别成员应当仅基于它们在公共组中的演示而被视为同一列表的任何其他成员的事实等价物。此外，在此可以引用本发明的各个实施例和示例连同其各个组成部分的替代。可以理解，这种实施例、示例和替代不应被视为彼此的事实等价物，而是被视为本发明的单独的且自治的表示。
而且，所述的特征、结构或特征可以以任何适当方式被组合在一个或多个实施例中。在以下描述中，提供了许多具体细节，诸如布局、距离、网络示例等的示例，以提供对本发明实施例的透彻理解。然而，相关领域的技术人员将认识到，本发明可以无需这些具体细节的一个或多个而实现，或者用其他方法、组件、布局等来实现。在其他情况下，为避免混淆本发明的多个方面，未详细示出或描述公知的结构、材料或操作。
尽管以上示例是本发明原理在一个或多个特定应用中的说明，但对于本领域普通技术人员显而易见的是，可以无需创造性劳动而作出实现方式的形式、用途和细节上的许多修改，且不背离本发明的原理和范围。因而，除了由所提出的权利要求书限制以外，本发明并非意图是限制性的。

Claims (28)

1.一种将流接入点(SAP)插入输入媒体数据上下文的多个已编码表示中的方法，所述方法包括：
将所述输入媒体数据上下文提供给编码器；
用所述编码器来编码所述输入媒体数据上下文以生成所述输入媒体数据上下文的多个已编码表示，其中所述输入媒体数据上下文的至少一部分被包括在所述多个已编码表示的第一已编码表示中且同一部分也被包括于所述多个已编码表示的第二已编码表示中，且其中根据对所述第二已编码表示编码所用的一组编码参数不同的一组编码参数来编码所述第一已编码表示；
将所述输入媒体数据上下文的已编码表示分段成所选的分段尺寸，用于使用超文本传输协议(HTTP)上的动态自适应流送(DASH)作为流送数据无线传输至用户设备(UE)；以及
在所述媒体数据上下文的每个已编码表示的分段中的位置处插入至少一个流接入点(SAP)，所述位置使UE能在所述SAP处在所述流送数据的单播传递和所述流送数据的多播传递之间切换，其中选择所述SAP的位置以便在仅使用SAP之后接收到的信息和所述分段中包含的初始化数据进行切换之后、使流送数据在UE处被解码，其中所述UE被配置成：使用标识所述至少一个SAP的SAP信息在单播传递和多播传递之间切换，并且所述SAP信息包括在所述UE处接收到的演进的多媒体广播和多播服务(eMBMS)用户服务描述(USD)中。
2.如权利要求1所述的方法，其特征在于，所述SAP使所述UE在使用所述分段中包含的所述初始化数据进行单播－广播切换之后，维持所述输入媒体数据上下文的回放，以减少由所述单播－广播切换造成的不连续性或回放中断。
3.如权利要求1所述的方法，其特征在于，在已编码表示的传输之前，与所述已编码表示中的至少一个SAP的位置有关的信息被发信号通知UE。
4.如权利要求3所述的方法，其特征在于，所述输入媒体数据上下文的不同已编码表示包括对具有不同比特率、帧速率、分辨率或编解码器类型的数据进行编码。
5.如权利要求3所述的方法，所述方法还包括：动态地生成和更新要在实况演示中发送的媒体分段中的至少一个SAP的位置、以及在所述已编码表示的传输之前将这些更新发信号通知所述UE。
6.如权利要求3所述的方法，其特征在于，将不同已编码表示的至少一个SAP位置选择处于相对于每个已编码表示中的所选视频帧或所选媒体时间的相同位置。
7.如权利要求1所述的方法，所述方法还包括：将所述输入媒体数据上下文和所述至少一个SAP的位置信息存储在多个服务器上，用于使用DASH以及使用单播传递和多播传递之一传输至所述UE。
8.一种可用于向用户设备(UE)提供流送多媒体内容的媒体服务器，所述媒体服务器包括：
编码模块，被配置成接收输入媒体数据上下文并且编码所述输入媒体数据上下文以生成所述输入媒体数据上下文的多个已编码表示，其中所述输入媒体数据上下文的至少一部分被包括于所述多个已编码表示的第一已编码表示中且同一部分也被包括于所述多个已编码表示的第二已编码表示中，且其中根据对所述第二已编码表示编码所用的一组编码参数不同的一组编码参数来编码所述第一已编码表示；
分段模块，被配置成将所述输入媒体数据上下文的已编码表示分段为所选的分段尺寸，用于作为流送多媒体内容传输至用户设备(UE)；以及
流接入点(SAP)插入模块，被配置成在所述媒体数据上下文的每个已编码表示的分段中的位置处插入至少一个SAP，所述位置使UE能在所述SAP处在所述流送多媒体内容的单播传递和所述流送多媒体内容的多播传递之间切换，其中所述UE使用包括在所述UE处接收到的演进的多媒体广播和多播服务(eMBMS)用户服务描述(USD)中的SAP信息执行所述切换，其中选择所述SAP的位置以便在仅使用SAP之后接收到的信息和所述分段中包含的初始化数据进行切换之后、使所述流送多媒体内容在所述UE处被解码。
9.如权利要求8所述的媒体服务器，其特征在于，所述媒体服务器还被配置成提供流送多媒体内容用于使用以下之一传输至UE：通过单播连接的超文本传输协议(HTTP)服务器；以及通过与至少一个演进节点B(eNodeB)的演进的多媒体广播和多播服务(eMBMS)连接的单向传输上文件传递(FLUTE)服务器。
10.如权利要求8所述的媒体服务器，其特征在于，所述媒体服务器还被配置成：使用单播连接提供多媒体内容的第一分段用于传输至UE、以及使用演进的多媒体广播和多播服务(eMBMS)连接提供多媒体内容的第二分段。
11.如权利要求8所述的媒体服务器，其特征在于，所述媒体服务器还被配置成提供所述输入媒体数据上下文的不同已编码表示，用于通过不同的单向传输上文件传递(FLUTE)会话进行传输，其中至少一个SAP被提供在所述输入媒体数据上下文的每一个已编码表示的分段中的位置处。
12.如权利要求8所述的媒体服务器，其特征在于，所述媒体服务器被配置成：经由超文本传输协议(HTTP)服务器通过单播来提供多媒体内容的第一分段；以及经由广播多播服务中心(BMSC)服务器通过演进的多媒体广播和多播服务(eMBMS)连接来提供多媒体内容的第二分段。
13.如权利要求12所述的媒体服务器，其特征在于，所述媒体服务器还被配置成基于MBMS顺序数据对所述分段的传输进行排序。
14.如权利要求12所述的媒体服务器，其特征在于，所述媒体服务器还被配置成在单播－MBMS同步SAP处，停止通过单播会话来提供多媒体内容的第一分段。
15.一种可用于接收超文本传输协议(HTTP)上动态自适应流送(DASH)格式的流送媒体的用户设备(UE)，包括：
在UE上运行的DASH客户端，所述DASH客户端被配置成：
从DASH内容服务器请求多个分段的流送数据；经由单播连接和与至少一个演进节点B(eNodeB)的演进多媒体广播和多播服务(eMBMS)连接之一从所述DASH内容服务器接收所述多个分段；以及
在所述流送媒体的流接入点(SAP)处请求在所述单播连接和所述eMBMS连接之间变化，其中选择所述SAP的位置以便在仅使用SAP之后接收到的信息和所述分段中包含的初始化数据进行切换之后、使所述流送数据在所述UE处被解码，其中所述UE基于包括在所述UE处接收到的演进的多媒体广播和多播服务(eMBMS)用户服务描述(USD)中的SAP信息在所述SAP处请求变化。
16.如权利要求15所述的UE，其特征在于，所述DASH客户端还被配置成：
从所述DASH内容服务器接收同步信息；以及基于所述同步信息来确定在哪个SAP处从所述单播连接变化为所述eMBMS连接。
17.如权利要求16所述的UE，其特征在于，所述同步信息包含在DASH媒体演示描述(MPD)中接收到的至少一个单播－eMBMS同步SAP，以便提供在所述单播连接和所述eMBMS连接之间的流送媒体中的同步点，以维持媒体的连续回放。
18.如权利要求15所述的UE，其特征在于，所述流送媒体中的SAP发生在从所述DASH内容服务器接收到的两个分段之间的边界处。
19.如权利要求15所述的UE，其特征在于，所述DASH客户端进一步被配置成通过所述eMBMS连接执行到多个单向传输上文件传递(FLUTE)会话的单播-到-广播切换、以及从多个单向传输上文件传递(FLUTE)会话接收多个分段。
20.如权利要求15所述的UE，其特征在于，所述DASH客户端进一步被配置成接收来自所述单播连接的流送媒体的至少一个分量以及来自所述eMBMS连接的流送媒体的至少一个分量。
21.如权利要求15所述的UE，其特征在于，所述DASH客户端还被配置成经由基于eMBMS顺序数据、经由所述eMBMS连接通过多个单向传输上文件传递(FLUTE)会话接收多个分段。
22.如权利要求15所述的UE，其特征在于，所述DASH客户端还被配置成从多个交替的eMBMS会话接收多个分段。
23.如权利要求15所述的UE，其特征在于，所述DASH客户端还被配置成无缝地接收来自所述单播连接的第一分段以及来自所述eMBMS连接的第二分段。
24.如权利要求23所述的UE，其特征在于，所述DASH客户端还被配置成在为用户提供连续性的同时，无缝地接收来自所述单播连接的第一分段以及来自所述eMBMS连接的第二分段。
25.如权利要求15所述的UE，其特征在于，所述DASH客户端还被配置成接收eMBMS顺序数据并且基于所述eMBMS顺序数据在多个eMBMS连接之间变化。
26.如权利要求15所述的UE，其特征在于，所述流送媒体中的每个SAP被动态地生成并被传送至所述UE以提供已更新的SAP位置，使得UE可以基于所述已更新的SAP位置，在将来媒体分段接收的所述SAP的位置处、请求在所述单播连接和所述eMBMS连接之间变化。
27.一种机器可读介质，其上存储有指令，所述指令在被执行时致使机器执行如权利要求1-7中任一项所述的方法。
28.一种用于将流接入点(SAP)插入输入媒体数据上下文的多个已编码表示中的设备，包括多个装置，每个装置用于执行如权利要求1-7中任一项所述的方法的相应步骤。
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