Image Share
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Image Share is an IMS enabled service for sharing images between terminals in mobile network. It has been specified by GSM Association in PRD IR.79 Image Share Interoperability Specification [1].
According to IR.79, “The terminal interoperable Image Share service allows users to share Images between them over PS connection with ongoing CS call, thus enhancing and enriching end-users voice communication.”
Image Share session begins by end-users setting up a normal CS (Circuit Switched) voice call. After voice call is set up, terminals perform registration to IMS core system with PS (Packet Switched) connection. Then based on successful capability negotiation between the terminals, the end-user will be presented an option in terminal UI offering the possibility of sharing image(s). If this is selected, then image(s) are transferred between Image Share clients using PS connection and recipient is able to see the image(s). During this process the normal CS voice session has been ongoing continuously.
Features
- IMS service, i.e. 3GPP compliant IMS core system required for the service provider/operator offering Image Share
- CSI (CS and IMS combinational) service compliant to 3GPP specifications TS 22.279, TS 23.279 and TS 24.279, i.e. CS voice call set up required prior to sharing the images
- SIP used for signaling via IMS
- MSRP (Message Session Relay Protocol, RFC 4975) used for media directly between the terminals
- IETF File transfer mechanisms [2] utilized for negotiating shared images between offerer and answerer via SIP/SDP offer/answer model
- Capability query performed using SIP OPTIONS method between the mobile terminals to find out whether the recipient is Image Share capable
- Peer-to-peer service, i.e. no server required in the network
- Both live and pre-stored images can be shared
- Requires 3G or EDGE DTM (Dual Transfer Mode) mobile network
Usage
According to GSMA press release [3] interoperability between different Image Share clients was successfully tested in a multi-vendor trial in May 2007, including interworking between multiple networks.
See also
- Video Share, which (re)uses similar basic architecture
- IM, especially OMA SIMPLE IM [4] which also utilizes MSRP for transporting media
- Multiple different file/image sharing applications & services available from various companies
References
- GSM Association PRD IR.79 Image Share Interoperability Specification [5]
- IETF RFC 4975 Message Session Relay Protocol
- 3GPP TS 22.279 Combinied Circuit Switched (CS) and IP Multimedia Subsystem (IMS) sessions; Stage 1
- 3GPP TS 23.279 Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services; Stage 2
- 3GPP TS 24.279 Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services; Stage 3