Mobile Technology
The wireless Data-Protocols
GSM and cdmaOne A are both 2G or second generation cellular system for carring voice and data, bot work on the same basics. If you wanna know more about this visit http://www.gsmworld.com in the history part.
TDMA or Time Division Multiple Access: a technology for delivering digital wireless service using time-division multiplexing. TDMA works by dividing a radio frequency into unique time slots and then allocating slots to different users (2 each). In this way, a single frequency can support multiple, simultaneous data channels. Mostly used in the Americas.
PDC is the same as TDMA but used as GSM cellular system.
W-CDMA and cdma2000 are both 3G or third generation of mobile communication. the improvements between the 2G and 3G are better voice quality and a bigger bandwith, IP traffic, greater capacity and improved spectrum and better roaming
UMTS or Universal Telecommuncation System is commonly used alongside the term 3G in Europe. This can be confusing however, as UMTS refers to a specific implementation of WCDMA within the 2.1GHz band which is the frequency that is made available for 3G in Europe and other parts of the world. It is an implementation of 3G
the follow up of technologies are going to be
- cdmaOne -> cdma2000 1x -> cdma2000 1x EV-DO or EV-DV
- TDMA to cdma2000 1x or to GSM (most will use GSM)
- GSM -> GPRS -> EDGE -> W-CDMA
So you are going to have 2 systems CDMA2000 and WCDMA
DATA for GSM
WAP or Wireless Application Protocol: a protocol to discribe how data is send and transmitted to a mobile phone.
GPRS or General Packed Radio Service: is a packet based technology for data transfer over an IP-based network and used as an enhancement for GSM networks, The speed of a GPRS capable device depends on how many timeslots (1 to 8, shared by active users) within a TDMA frame are used. Up and downlink are treated separately and various radio channel coding schemes allow bitrates from 9 to over 171.2 kbit/s (if device were to use all 8 channels without error correction) per user
HSCSD or High Speed Curcuit Switched Data: is an enhancement of current GSM networks allowing users to send and receive data with higher speeds. This is achieved by increasing the speed of one channel as well as giving the option of using several channels at the same time, which results in speeds close to 60 Kbps. This makes HSCSD particularly interesting to people who want to access the Internet at higher speeds than current GSM phones.
EDGE or Enhanced Data rates for Global Evolution (EGPRS): EDGE is being developed to be the basis for a 3G wireless standard which can be used by TDMA and GSM operators. It works with a new modulation technique which allows for better usage of existing frequencies. This means that EDGE can be deployed on existing GSM networks. EDGE enables data transfer speeds of up to 384 kilobits per second. This translates to 48 Kbps per timeslot enabling three times the data speeds of GPRS.
WCDMA or Wideband Code Division Multiple Access is a 3G technology used in UMTS. Data transfer speeds go up to 2 Mbps, and due to the efficient use of the radio spectrum, a wealth of different services can be accessed simultaneously including circuit and packet services with varying bandwidths. WCDMA data transfer speeds will go up to 10.8 Mbps.
HSDPA or 3.5G, not much is know about it, but this will be the GPRS of a 3G network, in run up to the 4G network, but this is future talk, not before 2010...
DATA for CDMA2000
cdma2000 is an IMT-2000 standard and included in the evolution part from cdmaOne.
cdma2000 1x will double the voice capacity and allow up to packet-based data transfer speeds of up to 307 Kbps.
cdma2000 1xEV, the next step, will allow for up to 2.4 Mbps data transfer rates (1xEV-DO, data only) and 4.8 Mbps in phase 2 (1xEV-DV, data and voice).
WML or Wireless Markup Language: a markup language based on XML. it a browser context how text and images will be showed on a small screen device.
XHTML is a more advanced Markup Language.
Push to Talk
A one-way communication function in a mobile phone which lets one user at a time talk to another user or a selected user group. Push to talk is activated by pressing the push to talk key or equivalent on the phone. In a user group, the turns to speak are requested by pressing the push to talk key and granted on a first come, first served basis.
Push to Talk over cellular
A service that provides direct one-to-one and one-to-many voice communication in the cellular network. Calls can be started both to individuals and to talk groups with just the push of a key. Call connection is almost instantaneous and the receiver does not have to answer the call. A specifically PoC-enabled terminal is needed for the service.
Source: Kristof.Vanriet from the mobile-review.com forums
GSM and cdmaOne A are both 2G or second generation cellular system for carring voice and data, bot work on the same basics. If you wanna know more about this visit http://www.gsmworld.com in the history part.
TDMA or Time Division Multiple Access: a technology for delivering digital wireless service using time-division multiplexing. TDMA works by dividing a radio frequency into unique time slots and then allocating slots to different users (2 each). In this way, a single frequency can support multiple, simultaneous data channels. Mostly used in the Americas.
PDC is the same as TDMA but used as GSM cellular system.
W-CDMA and cdma2000 are both 3G or third generation of mobile communication. the improvements between the 2G and 3G are better voice quality and a bigger bandwith, IP traffic, greater capacity and improved spectrum and better roaming
UMTS or Universal Telecommuncation System is commonly used alongside the term 3G in Europe. This can be confusing however, as UMTS refers to a specific implementation of WCDMA within the 2.1GHz band which is the frequency that is made available for 3G in Europe and other parts of the world. It is an implementation of 3G
the follow up of technologies are going to be
- cdmaOne -> cdma2000 1x -> cdma2000 1x EV-DO or EV-DV
- TDMA to cdma2000 1x or to GSM (most will use GSM)
- GSM -> GPRS -> EDGE -> W-CDMA
So you are going to have 2 systems CDMA2000 and WCDMA
DATA for GSM
WAP or Wireless Application Protocol: a protocol to discribe how data is send and transmitted to a mobile phone.
GPRS or General Packed Radio Service: is a packet based technology for data transfer over an IP-based network and used as an enhancement for GSM networks, The speed of a GPRS capable device depends on how many timeslots (1 to 8, shared by active users) within a TDMA frame are used. Up and downlink are treated separately and various radio channel coding schemes allow bitrates from 9 to over 171.2 kbit/s (if device were to use all 8 channels without error correction) per user
HSCSD or High Speed Curcuit Switched Data: is an enhancement of current GSM networks allowing users to send and receive data with higher speeds. This is achieved by increasing the speed of one channel as well as giving the option of using several channels at the same time, which results in speeds close to 60 Kbps. This makes HSCSD particularly interesting to people who want to access the Internet at higher speeds than current GSM phones.
EDGE or Enhanced Data rates for Global Evolution (EGPRS): EDGE is being developed to be the basis for a 3G wireless standard which can be used by TDMA and GSM operators. It works with a new modulation technique which allows for better usage of existing frequencies. This means that EDGE can be deployed on existing GSM networks. EDGE enables data transfer speeds of up to 384 kilobits per second. This translates to 48 Kbps per timeslot enabling three times the data speeds of GPRS.
WCDMA or Wideband Code Division Multiple Access is a 3G technology used in UMTS. Data transfer speeds go up to 2 Mbps, and due to the efficient use of the radio spectrum, a wealth of different services can be accessed simultaneously including circuit and packet services with varying bandwidths. WCDMA data transfer speeds will go up to 10.8 Mbps.
HSDPA or 3.5G, not much is know about it, but this will be the GPRS of a 3G network, in run up to the 4G network, but this is future talk, not before 2010...
DATA for CDMA2000
cdma2000 is an IMT-2000 standard and included in the evolution part from cdmaOne.
cdma2000 1x will double the voice capacity and allow up to packet-based data transfer speeds of up to 307 Kbps.
cdma2000 1xEV, the next step, will allow for up to 2.4 Mbps data transfer rates (1xEV-DO, data only) and 4.8 Mbps in phase 2 (1xEV-DV, data and voice).
WML or Wireless Markup Language: a markup language based on XML. it a browser context how text and images will be showed on a small screen device.
XHTML is a more advanced Markup Language.
Push to Talk
A one-way communication function in a mobile phone which lets one user at a time talk to another user or a selected user group. Push to talk is activated by pressing the push to talk key or equivalent on the phone. In a user group, the turns to speak are requested by pressing the push to talk key and granted on a first come, first served basis.
Push to Talk over cellular
A service that provides direct one-to-one and one-to-many voice communication in the cellular network. Calls can be started both to individuals and to talk groups with just the push of a key. Call connection is almost instantaneous and the receiver does not have to answer the call. A specifically PoC-enabled terminal is needed for the service.
Source: Kristof.Vanriet from the mobile-review.com forums
mobilelife - 2004-12-30 16:34
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