An electronic telecommunications device, often referred to as a cellular phone or cellphone. Mobile phones connect to a wireless communications network through radio wave or satellite transmissions. Most mobile phones provide voice communications, Short Message Service (SMS), Multimedia Message Service (MMS), and newer phones may also provide Internet services such as Web browsing and e-mail.
Abbreviated as MMS, Multimedia Message Service is a store-and-forward method of transmitting graphics, video clips, sound files and short text messages over wireless networks using the WAP protocol. Carriers deploy special servers, dubbed MMS Centers (MMSCs) to implement the offerings on their systems. MMS also supports e-mail addressing, so the device can send e-mails directly to an e-mail address. The most common use of MMS is for communication between mobile phones.
MMS, however, is not the same as e-mail. MMS is based on the concept of multimedia messaging. The presentation of the message is coded into the presentation file so that the images, sounds and text are displayed in a predetermined order as one singular message. MMS does not support attachments as e-mail does.
To the end user, MMS is similar to SMS.
Multimedia Messaging Service (MMS) is a store and forward messaging service that allows mobile subscribers to exchange multimedia messages with other mobile subscribers. As such it can be seen as an evolution of SMS, with MMS supporting the transmission of additional media types:
text
picture
audio
video
combinations of the above
Multimedia Messaging Service (MMS) is an important emerging service, which allows the sending of multiple media in a single message, and the ability to send a message to multiple recipients.
The originator can easily create a Multimedia Message, either using a built-in or accessory camera, or can use images and sounds stored previously in the phone (and possibly downloaded from a web site).
Even if the recipient phone is not switched on, the Multimedia Message will be stored and sent to the recipient as soon as they switch on their phone. In a non-roaming case, it is expected that the subscriber will allow a Multimedia Message to be downloaded automatically to their phone and then they would be notified and could see the Multimedia Message immediately.
A number of Multimedia Messages can be stored in the users handset and reviewed or forwarded at a later date.
Each Multimedia Message contains a number of pages (think of a PowerPoint slide show as an analogy). On each page, there can be one image and one set of text. An audio file can also be attached. The time that each "page" is displayed can be specified, so the user experience is somewhat like a slide show.
So how does MMS work?
Depending upon the operator, a typical example of how an MMS message can be sent and received between two compatible MMS phones is detailed below:
STEP 1: Using an MMS compatible phone, take a photo.
STEP 2: Use your phone to personalise the message by adding text, sound clip or your own voice.
STEP 3: Send the MMS message
On an compatible phone, the MMS message will appear with a new message alert. The picture message will open on the screen, the text will appear below the image and the sound will begin to play automatically.
If the message is sent to a non-compatible MMS phone the user will receive a SMS message along the lines of:
"You have been sent a picture message!"
They may then be given a website address, and possibly and username and password on which they can view the message.
Again, this is a simple example and may differ from operator to operator.
For the phone user, MMS is very similar to Short Message Service (SMS)-it provides automatic, immediate delivery of user-created content from phone to phone. The message addressing used is primarily phone numbers, thus the traffic goes from phone to phone. MMS also provides support for e-mail addressing, so that messages can also be sent by e-mail.In addition to the familiar text content of SMS, MMS messages can contain still images, voice or audio clips, and later also video clips and presentation information. An MMS message is a multimedia presentation in a single entry-it is not a text file with attachments.MMS is bearer independent and is not limited to only GSM or WCDMA networks.
2. Is MMS a WAP browser application?
MMS does not use the WAP browser in any way. The MMS application is a messaging application, not a browsing application.Therefore it requires its own user interface, just as SMS does.
3. Is MMS a Nokia proprietary service or a standardized service?
The WAP Forum and 3GPP standardize MMS to make it an open standard. The 3GPP specification defines the network architecture and general functions. The WAP Forum MMS specification defines message encapsulation and application protocols. Existing transport protocols are used for delivery.
4. Does MMS require changes in the network?
MMS is primarily targeted at phone-to-phone traffic. There is always the possibility that the receiving phone is not reachable due to being switched off, having an empty battery or being within poor network coverage. A new network element, the Multimedia Messaging Service Center (MMSC), is needed for storing the MMS messages until the receiving phone is reached. In addition the MMSC hosts a number of interfaces to connecting networks and an API (Application Programming Interface) to enable delivery of value-added services and network interconnection to e-mail, for example. Nokia and several other manufacturers make MMSCs.
5. What content types does MMS support?
The MMS standards do not mandate any specific content formats for MMS. Instead the MMS messages are encapsulated in a standard way, so that the receiving party can identify those content formats it does not support and handle them in a controlled way. This is the way content interoperability is being solved on the Internet, too.The standard recommends the following supported media types: JPEG, GIF, text, AMR voice and some other less-important formats. To achieve interoperability, Nokia and some other manufacturers have agreed upon a MMS Conformance Document that lists the minimum set of content types to be supported by a MMS phone.
6. How big can an MMS message be?
The standard does not specify a maximum size for an MMS message. This is done to ensure future interoperability and to avoid the SMS dilemma, where the 160-character limit has been problematic.The message size is therefore an implementation issue. It is also dependent on operator preferences, if they want to have a standardized message size for billing purposes. Nokia foresees that the MMS messages in the first phase will be between 30 kB and 100 kB in size.
7. How fast is MMS transmission mobile phone -> multimedia messaging service center -> mobile phone?
The MMS transmission is dependent on the message size and the used bearer. The receiving user will not be aware of the ongoing transmission before the whole message has been delivered, he or she will perceive no delay at all! Thus MMS will be perceived as very fast!
8. Can you send MMS messages to phones that do not have the MMS feature?
The Nokia Multimedia Terminal Gateway (TGW) provides support for phones without MMS receive capability. The receiving terminal is identified as a non-MMS phone and instead of sending the MMS message to the phone, the message is stored on a Web page. ASMS with the address to the Web page is sent to the non-MMS phone over SMS.
9. Can you send MMS messages to phones with black-and-white displays?
The main part of the MMS content is expected to be color images. To experience the full MMS experience a color display is required. If a phone has the MMS feature it can in theory receive MMS messages. Several different ways to present color images using dithering on black-and-white displays exist, and to a limited extent a representation of the color image can also be made on a black-and-white display.
10. What does it cost for a phone user to send an MMS message?
Charging of MMS traffic is controlled by the operator. Nokia proposes that MMS should be charged on a transaction basis, exactly as SMS is being charged per message, not per size. It is up to the operators how much to charge for an MMS. Costs in the magnitude of 2-3 times the cost of a SMS have been discussed
new standard in mobile messaging. Like SMS (Short Messaging Service), MMS is a way to send a message from one mobile to another. The difference is that MMS can include not just text, but also sound, images and video. It is also possible to send MMS messages from a mobile phone to an email address.
Formats that can be embedded within MMS include:
1. Text (formatted with fonts, colours, etc)
2. Images (JPEG, GIF format)
3. Audio (MP3, MIDI)
4. Video (MPEG)
Images could be downloaded from WAP sites, selected from a menu within the phone, or could even be photos taken using a built-in camera if the phone has one (e.g. the Nokia 7650, Sony Ericsson T300, etc).
MMS is an extension of the SMS protocol, making its usage familiar to existing SMS users. An MMS message is a single entity, not a collection of attachments. One of the main practical differences between MMS and SMS is that whilst SMS messages are limited to 160 bytes, an MMS message has no size limit and could be many Kbytes in size, or even larger. MMS requires a third generation (3G) network to enable such large messages to be delivered, although smaller messages can be sent even with second generation networks using GPRS.
Whilst mobile phone users can create and send their own MMS messages, perhaps the biggest use of MMS is likely to be companies sending MMS messages to subscribers, enquirers or customers. For example, a company could send visitors an MMS map to help them find their office. Other possible applications include weather reports, news & sport bulletins, etc.
The first MMS capable phones started to appear in 2002, and the standard looks set to become very widely used in the years ahead. Different manufacturers are introducing MMS technologies in different ways. For example, Nokia are introducing MMS directly into their latest phones, whilst Sony Ericsson is introducing phones that have EMS (Enhanced messaging Service). EMS is a halfway house between SMS and MMS, providing some of the features of MMS (e.g. formatted text, simple pictures, simple audio such as ringtones, and even some animation). EMS is a technology that is designed to work with existing networks, but will ultimately be made obsolete by MMS.
What Is MMS?
Multimedia Messaging Service (MMS) is a messaging service for the mobile environment standardized by the WAP Forum and 3GPP. To the end-user MMS is very similar to the Short Message Service (SMS): it provides automatic immediate delivery for user-created content from device to device. MMS messages are primarily delivered from device to device, but also value-added services can be created by developing applications that send/receive MMS messages to/from devices. MMS also supports e-mail addressing, so that messages can be sent directly to an e-mail address.
In addition to the content type familiar from SMS text, MMS messages can contain still images, text, voice- or audioclips, videoclips, and presentation information. The presentation information contains a "recipe" for presentation of the message content, for example, in which order the images are to appear on the screen, how long they will be displayed, when should the soundclip be started. A multimedia message is a multimedia presentation created by the sender using, for example, predefined templates. Alternatively the content can be obtained readymade from a third-party content provider. The message is delivered to the recipient's device using Push and the recipient is notified only after the whole message has been received. Upon acknowledging receipt of the message, the presentation starts running. It may look like a slideshow or be a combination of slideshow and audio, etc. An MMS message is a multimedia presentation in one entity; it is not a text file with attachments.
MMS transport is done using WAP transport and any bearer with WAP capabilities can be used. Thus, MMS is bearer-independent, for example, MMS is not limited to only GSM or WCDMA. WAP Wireless Session Protocol (WSP) is used for message transport from device to MMSC and from MMSC to device. In addition, WAP Push features are used to deliver the message from server to receiving device
2006-12-20 13:22:11
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answer #5
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answered by neema s 5
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