Evolved EDGE
Encyclopedia
Evolved EDGE is a bolt-on extension to the GSM mobile telephony standard, which extends the previous EDGE
upgrade to achieve theoretical speeds of up to 1 Mbit/s with relatively low cost and ease. Also called EDGE Evolution, it promises real world downlink speeds of up to 600kbps with seamless transitions to and from 3G coverage, which should serve to extend the life of GSM networks in areas where the additional cost to go full 3G isn't necessarily justified. As of 2009, there are no commercial networks
which support Evolved EDGE standard (3GPP Rel-7).
There is a considerable research and development happening throughout the world for this new technology. As of 2008, there are many major wireless network & infrastructure providers who have invested in this technology. However successful trial has been made by Nokia Siemens and "one of China's leading operators" demonstrated in a live environment.
networks.
In EDGE
, a single RLC data block (ranging from 23 to 148 bytes of data) is transmitted over four frames, using a single time slot. On average, this requires 20 ms for one way transmission. Under the RTTI scheme, one data block is transmitted over two frames in two timeslots, reducing the latency of the air interface to 10 ms.
In addition, Reduced Latency also implies support of Piggy-backed ACK/NACK
(PAN), in which a bitmap of blocks not received is included in normal data blocks. Using the PAN field, the receiver may report missing data blocks immediately, rather than waiting to send a dedicated PAN message.
A final enhancement is RLC-non persistent mode. With EDGE, the RLC interface could operate in either acknowledged mode, or unacknowledged mode. In unacknowledged mode, there is no retransmission of missing data blocks, so a single corrupt block would cause an entire upper-layer IP packet to be lost. With non-persistent mode, an RLC data block may be retransmitted if it is less than a certain age. Once this time expires, it is considered lost, and subsequent data blocks may then be forwarded to upper layers.
Enhanced Data Rates for GSM Evolution
Enhanced Data rates for GSM Evolution is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM...
upgrade to achieve theoretical speeds of up to 1 Mbit/s with relatively low cost and ease. Also called EDGE Evolution, it promises real world downlink speeds of up to 600kbps with seamless transitions to and from 3G coverage, which should serve to extend the life of GSM networks in areas where the additional cost to go full 3G isn't necessarily justified. As of 2009, there are no commercial networks
Wireless network
Wireless network refers to any type of computer network that is not connected by cables of any kind. It is a method by which homes, telecommunications networks and enterprise installations avoid the costly process of introducing cables into a building, or as a connection between various equipment...
which support Evolved EDGE standard (3GPP Rel-7).
There is a considerable research and development happening throughout the world for this new technology. As of 2008, there are many major wireless network & infrastructure providers who have invested in this technology. However successful trial has been made by Nokia Siemens and "one of China's leading operators" demonstrated in a live environment.
Motivation
The main intention of increasing the existing EDGE throughput is that many operators would like to upgrade their existing infrastructure rather than invest on new network infrastructure. Mobile operators have invested billions in GSM networks, many of which are already capable of supporting EDGE data speeds up to 236.8 kbit/s. With a software upgrade and a new device compliant with Evolved EDGE (like an Evolved EDGE smart phone) for the user, these data rates can be boosted to speeds approaching 1 Mbit/s. Many service providers may not invest on a completely new technology like 3G3G
3G or 3rd generation mobile telecommunications is a generation of standards for mobile phones and mobile telecommunication services fulfilling the International Mobile Telecommunications-2000 specifications by the International Telecommunication Union...
networks.
Reduced Latency
With Evolved EDGE come three major features designed to reduce latency over the air interface.In EDGE
Edge
- Aviation :* Leading edge, a line connecting the forward-most points of a wing's profile* Trailing edge, the rear edge of the wing* Zivko Edge 540, an aerobatic aircraft- Mathematics, science and technology :...
, a single RLC data block (ranging from 23 to 148 bytes of data) is transmitted over four frames, using a single time slot. On average, this requires 20 ms for one way transmission. Under the RTTI scheme, one data block is transmitted over two frames in two timeslots, reducing the latency of the air interface to 10 ms.
In addition, Reduced Latency also implies support of Piggy-backed ACK/NACK
Nack
Nack is an Ortsgemeinde – a municipality belonging to a Verbandsgemeinde, a kind of collective municipality – in the Alzey-Worms district in Rhineland-Palatinate, Germany.- Location :...
(PAN), in which a bitmap of blocks not received is included in normal data blocks. Using the PAN field, the receiver may report missing data blocks immediately, rather than waiting to send a dedicated PAN message.
A final enhancement is RLC-non persistent mode. With EDGE, the RLC interface could operate in either acknowledged mode, or unacknowledged mode. In unacknowledged mode, there is no retransmission of missing data blocks, so a single corrupt block would cause an entire upper-layer IP packet to be lost. With non-persistent mode, an RLC data block may be retransmitted if it is less than a certain age. Once this time expires, it is considered lost, and subsequent data blocks may then be forwarded to upper layers.