This standard specifies protocols among content delivery (CD) functional entity (FE)@ service routing (SR) FE@ service policy decision (SPD) FE@ service discovery and negotiation (SDN) FE@ and context information management (CIM) FE to support advanced content delivery capability in next generation service overlay networks. The content delivery capability aims to support content discovery@ content cache and storage management@ content delivery control@ and transport QoS control including context-aware and dynamically adaptive content delivery operations. Purpose The purpose of this standard is to enable network operators@ service/content providers@ and end users to provide and consume content services based on advanced content delivery capability of a Next Generation Service Overlay Network (NGSON) with context-aware and dynamically adaptive features. This standard is also to provide interoperability of content services between network operators and content providers.