IEC 62514:2010 pdf – Multimedia gateway in home networks – Guidelines.
4.2.5 Security
The HUG shall support ORM, key management, authentication and security to log on outside networks.
4.2.5 Interconnection
HMG shall support the network management. protocol translation, address assignment, configuration and management on the home networked devices, in different multimedia networks
4.2.7 Interlaces and access
These provide the connection between the home network and outside networks (for example the Internet) when necessary. which is optional.
The detailed interface and communication protocol requirements on both LAN side and WAN side are specified In Clause 11. The specific protocol that is to be applied depends on the application case.
5 Interconnection requirements
5.1 General connection requirements
Where the home multimedia network 5 an iP network, the requirements for the HUG should be as follows:
a) HMG shall Implement a Dynamic Host Configuration Protocol (DHCP) server in order to assign iP address to DHCP client In the home network where the HUG Is Involved.
b) HMG should support Domain Name System (DNS) In order to use device name for better user experience.
c) Those messages are formatted by using the SOAP HTTP binding, which shall be compliant with ISO/IEC 29341-1.
d) HMG should collect information with respect to all the devices connected to the home network by using device description and service description of each device in order to manage the devices.
a) HMG also should control other devices such as HMRec and HMSou by using appropriate actions to realize use cases described in this standard.
HMG shall also conform to the following requirements defined and specified in lC 62481-1,
1) HMG shall support a TCP1IP stack that Includes lPv4. TCP. UDP. ARP, and ICMP.
g) HMG may also support general capability recommendations and device recommendations.
h) The detailed methods of interconnection shall be compliant with 7.3 of IEC 62481-1:2007 (Device discovery and control).
) HMG shall support Simple Object Access Protocol (SOAP) header and body elements, and the messages are delivered via HTTP. The HMG as well as HMS0u and HMRec support the messaging scheme by using GENA protocol to exchange the event information inside the high-speed system. A control point Invokes the action to the device’s service In order to control It and when the action has completed or failed, the service returns any results or errors of the action.
j) HMG shall support the detailed methods of device management.
6 AV processing requirements
6.1 General
The HMG may offer services for applications in home network systems. In summary, service requirements Include multimedia transformation and multimedia stream control and may be fulfilled by using the services and actions which are defined by UPnP AV specifications ISOIIEC 29341.3) and DINA guidelines (IEC 62481). All these AV processing services need some requirements for hardware and software of the HMG.
6.2 Multimedia transformation service
6.2.1 Requirements summary
The following requirements apply.
a) The HMG shall provide the media conversion service, including code conversion (transcoding), resolution conversion (transcaling), and shall provide the media conversion service of frame rate conversion (transrating).
b) The HMG should support voice code conversion.
c) The media conversion service request message shall Include the URI of the media resources, which specifies media code format, resolution, frame rate and transport protocols needed by the requester, In the case of getting contents from WUS, it can also Include the code format. resolution and frame rate of the requested contents, as well as the media transport protocols supported by the media content owner.
d) The HMG should be able to convert audio streams into voice streams
e) The HMG should be able to convert voice streams into audio streams.
1) The HMG should be able to provide the video clip function, which shall be done in accordance with the capability of receiving terminals.
6.2.2 Applications mode Media conversion General
Media stream conversion is to convert a media stream from one mode to another. It includes code conversion, resolution conversion, rate conversion and transport protocol translation. As shown in Figure 3, the green media stream Indicates a dynamic conversion process; the HMG converts a MPEG2 media stream transmitted from the HMS0u into an H.264 media stream transmitted through the hyper text transfer protocol (HTTP): then the HMG sends the stream to the HMReC. In case the media server can know the devices at the usefs home and the media formats supported, it can use the remaining capabilities of the HMG to convert the media contents on the media server into the format needed by the players. In this way, when such contents are played, they need not be dynamically converted, as the conversion might affect the QoS in real-time playback.