ETSI TS 103 320指定了GEM配对屏幕服务框架，该框架正在解决阶段1和 DVB配套屏幕要求的1倍以上。这些需求要求扩展GEM中间件 规范ETSI TS 102 728[1]，以支持同伴之间的信息交换和同步 屏幕和主要服务。Companion Screen Service Framework为提供其 家庭网络中配套设备的功能。GEM companion服务允许广播公司和内容 供应商动态提供集成屏幕设备（如手机、平板电脑、PC）的配套服务 等进入观看体验。GEM配套服务可以通过常规GEM应用程序部署，并支持广播公司和内容 提供商可以动态添加伴随服务，从而增强观众对伴随设备的体验。这些伴随设备可以通过标准化协议（例如UPnP、， REST、WebSockets）或可以选择实现专有通信协议。该框架定义了一种基于UPnP应用程序管理服务的通用发现机制 服务。本文档定义的伴随屏幕服务框架与GEM配置文件正交，并且 版本和可用于所有GEM平台和衍生平台（MHP、OCAP、BD-J）。

ETSI TS 103 320 specifies the GEM Companion Screen Service Framework, which is addressing the Phase 1 and 1+ of DVB's companion screen requirements. These requirements ask for extensions of the GEM middleware specification ETSI TS 102 728 [1], to support information exchange and synchronization between the companion screen and the primary service.The Companion Screen Service Framework provides the infrastructure for GEM companion services that offer their functionality to companion devices in the home network. GEM companion services allow broadcasters and content providers to dynamically provide companion services that integrate screen devices, such as mobile phones, tablets, PCs etc. into the viewing experience.GEM companion services can be deployed via regular GEM applications and enable the broadcaster and content provider to dynamically add companion services, thus augmenting the experience of the viewer to companion devices.These companion devices can communicate with the GEM companion services via standardized protocols (e.g. UPnP, REST, WebSockets) or can chose to implement proprietary communication protocols.The framework defines a common discovery mechanism based on the UPnP Application Management Service for these services.The companion screen service framework as defined by the present document is orthogonal to GEM profiles and versions and can be used on all GEM platforms and derived platforms (MHP, OCAP, BD-J).