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Enhanced Data rates for GSM
GSM
Evolution (EDGE) (also known as Enhanced GPRS
GPRS
(EGPRS), or IMT Single Carrier (IMT-SC), or Enhanced Data rates for Global Evolution) is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM. EDGE is considered a pre-3G radio technology and is part of ITU's 3G definition.[1] EDGE was deployed on GSM
GSM
networks beginning in 2003 – initially by Cingular
Cingular
(now AT&T) in the United States.[2] EDGE is standardized also by 3GPP as part of the GSM
GSM
family. A variant, so called Compact-EDGE, was developed for use in a portion of Digital AMPS network spectrum.[3] Through the introduction of sophisticated methods of coding and transmitting data, EDGE delivers higher bit-rates per radio channel, resulting in a threefold increase in capacity and performance compared with an ordinary GSM/ GPRS
GPRS
connection. EDGE can be used for any packet switched application, such as an Internet
Internet
connection. Evolved EDGE continues in Release 7 of the 3GPP standard providing reduced latency and more than doubled performance e.g. to complement High-Speed Packet Access (HSPA). Peak bit-rates of up to 1 Mbit/s and typical bit-rates of 400 kbit/s can be expected.

Contents

1 Technology

1.1 Transmission techniques 1.2 EDGE modulation and coding scheme (MCS)

2 Evolved EDGE

2.1 Technology

2.1.1 Reduced Latency 2.1.2 Downlink Dual Carrier 2.1.3 Higher Modulation
Modulation
Schemes

3 Networks 4 See also 5 References 6 External links

Technology[edit] EDGE/E GPRS
GPRS
is implemented as a bolt-on enhancement for 2.5G GSM/GPRS networks, making it easier for existing GSM
GSM
carriers to upgrade to it. EDGE is a superset to GPRS
GPRS
and can function on any network with GPRS deployed on it, provided the carrier implements the necessary upgrade. EDGE requires no hardware or software changes to be made in GSM
GSM
core networks. EDGE-compatible transceiver units must be installed and the base station subsystem needs to be upgraded to support EDGE. If the operator already has this in place, which is often the case today, the network can be upgraded to EDGE by activating an optional software feature. Today EDGE is supported by all major chip vendors for both GSM
GSM
and WCDMA/HSPA. Transmission techniques[edit] In addition to Gaussian minimum-shift keying
Gaussian minimum-shift keying
(GMSK), EDGE uses higher-order PSK/8 phase shift keying (8PSK) for the upper five of its nine modulation and coding schemes. EDGE produces a 3-bit word for every change in carrier phase. This effectively triples the gross data rate offered by GSM. EDGE, like GPRS, uses a rate adaptation algorithm that adapts the modulation and coding scheme (MCS) according to the quality of the radio channel, and thus the bit rate and robustness of data transmission. It introduces a new technology not found in GPRS, Incremental Redundancy, which, instead of retransmitting disturbed packets, sends more redundancy information to be combined in the receiver. This increases the probability of correct decoding. EDGE can carry a bandwidth up to 236 kbit/s (with end-to-end latency of less than 150 ms) for 4 timeslots (theoretical maximum is 473.6 kbit/s for 8 timeslots) in packet mode. This means it can handle four times as much traffic as standard GPRS. EDGE meets the International Telecommunications Union's requirement for a 3G network, and has been accepted by the ITU
ITU
as part of the IMT-2000 family of 3G standards.[1] It also enhances the circuit data mode called HSCSD, increasing the data rate of this service. EDGE modulation and coding scheme (MCS)[edit] The channel encoding process in GPRS
GPRS
as well as EGPRS/EDGE consists of two steps: first, a cyclic code is used to add parity bits, which are also referred to as the Block Check Sequence, followed by coding with a possibly punctured convolutional code.[4] In GPRS, the Coding Schemes CS-1 to CS-4 specify the number of parity bits generated by the cyclic code and the puncturing rate of the convolutional code.[4] In GPRS
GPRS
Coding Schemes CS-1 through CS-3, the convolutional code is of rate 1/2, i.e. each input bit is converted into two coded bits.[4] In Coding Schemes CS-2 and CS-3, the output of the convolutional code is punctured to achieve the desired code rate.[4] In GPRS
GPRS
Coding Scheme CS-4, no convolutional coding is applied.[4] In EGPRS/EDGE, the Modulation
Modulation
and Coding Schemes MCS-1 to MCS-9 take the place of the Coding Schemes of GPRS, and additionally specify which modulation scheme is used, GMSK or 8PSK.[4] MCS-1 through MCS-4 use GMSK and have performance similar (but not equal) to GPRS, while MCS-5 through MCS-9 use 8PSK.[4] In all E GPRS
GPRS
Modulation
Modulation
and Coding Schemes, a convolutional code of rate 1/3 is used, and puncturing is used to achieve the desired code rate.[4] In contrast to GPRS, the Radio Link Control (RLC) and Media Access Control
Media Access Control
(MAC) headers and the payload data are coded separately in EGPRS.[4] The headers are coded more robustly than the data.[4]

GPRS Coding scheme Bitrate including RLC/MAC overhead[a][b] (kbit/s/slot) Bitrate excluding RLC/MAC overhead[c] (kbit/s/slot) Modulation Code rate

CS-1 9.20 8.00 GMSK 1/2

CS-2 13.55 12.00 GMSK ≈2/3

CS-3 15.75 14.40 GMSK ≈3/4

CS-4 21.55 20.00 GMSK 1

EDGE Modulation
Modulation
and Coding Scheme (MCS) Bitrate including RLC/MAC overhead[a] (kbit/s/slot) Bitrate excluding RLC/MAC overhead[c] (kbit/s/slot) Modulation Data code rate Header code rate

MCS-1 9.20 8.00 GMSK ≈0.53 ≈0.53

MCS-2 11.60 10.40 GMSK ≈0.66 ≈0.53

MCS-3 15.20 14.80 GMSK ≈0.85 ≈0.53

MCS-4 18.00 16.80 GMSK 1 ≈0.53

MCS-5 22.80 21.60 8PSK ≈0.37 1/3

MCS-6 30.00 28.80 8PSK ≈0.49 1/3

MCS-7 45.20 44.00 8PSK ≈0.76 ≈0.39

MCS-8 54.80 53.60 8PSK ≈0.92 ≈0.39

MCS-9 59.60 58.40 8PSK 1 ≈0.39

^ a b This is rate at which the RLC/MAC layer protocol data unit (PDU) (called a radio block) is transmitted. As shown in TS 44.060 section 10.0a.1,[5] a radio block consists of MAC header, RLC header, RLC data unit and spare bits. The RLC data unit represents the payload, the rest is overhead. The radio block is coded by the convolutional code specified for a particular Coding Scheme, which yields the same PHY layer data rate for all Coding Schemes. ^ Cited in various sources, e.g. in TS 45.001 table 1.[4] is the bitrate including the RLC/MAC headers, but excluding the uplink state flag (USF), which is part of the MAC header,[6] yielding a bitrate that is 0.15 kbit/s lower. ^ a b The net bitrate here is the rate at which the RLC/MAC layer payload (the RLC data unit) is transmitted. As such, this bit rate excludes the header overhead from the RLC/MAC layers.

Evolved EDGE[edit] Evolved EDGE, also called EDGE Evolution, is a bolt-on extension to the GSM
GSM
mobile telephony standard, which improves on EDGE in a number of ways. Latencies are reduced by lowering the Transmission Time Interval by half (from 20 ms to 10 ms). Bit rates are increased up to 1 Mbit/s peak bandwidth and latencies down to 80 ms using dual carrier, higher symbol rate and higher-order modulation (32QAM and 16QAM instead of 8PSK), and turbo codes to improve error correction. This results in real world downlink speeds of up to 600kbit/s.[7] Further the signal quality is improved using dual antennas improving average bit-rates and spectrum efficiency. 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
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 smartphone) for the user, these data rates can be boosted to speeds approaching 1 Mbit/s (i.e. 98.6 kbit/s per timeslot for 32QAM). Many service providers may not invest on a completely new technology like 3G networks.[8] Considerable research and development happened throughout the world for this new technology. A successful trial by Nokia Siemens and "one of China's leading operators" has been achieved in a live environment.[8] With the introduction for more advanced wireless technologies like UMTS
UMTS
and LTE, which also focus on a network coverage layer on low frequencies and the upcoming phase-out and shutdown of 2G mobile networks, it is very unlikely that Evolved EDGE will ever see any deployment on live networks. Up to now (as of 2016) there are no commercial networks which support the Evolved EDGE standard (3GPP Rel-7). Technology[edit] Reduced Latency[edit] With Evolved EDGE come three major features designed to reduce latency over the air interface. 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. Downlink Dual Carrier[edit] With Downlink Dual Carrier, the handheld is able to receive on two different frequency channels at the same time, doubling the downlink throughput. In addition, if second receiver is present then the handheld is able to receive on an additional timeslot in single-carrier mode, because it may overlap the tuning of one receiver with other tasks. Higher Modulation
Modulation
Schemes[edit] Both uplink and downlink throughput is improved by using 16 or 32 QAM (Quadrature Amplitude Modulation), along with turbo codes and higher symbol rates. Networks[edit] The Global mobile Suppliers Association (GSA) states that,[9] as of May 2013, there were 604 GSM/EDGE networks in 213 countries, from a total of 606 mobile network operator commitments in 213 countries. See also[edit]

Computer science portal Telecommunication
Telecommunication
portal

Broadband Internet
Internet
access CDMA2000 Evolution-Data Optimized List of device bandwidths Mobile broadband Spectral efficiency comparison table UMTS WiFi

References[edit]

^ a b "Archived copy" (PDF). Archived from the original (PDF) on 2009-03-06. Retrieved 2011-05-10.  ^ (PDF) http://www.itu.int/ITU-D/imt-2000/MiscDocuments/IMT-Deployments-Rev3.pdf. Retrieved April 16, 2008.  Missing or empty title= (help)[dead link] ^ ETSI SMG2 99/872 ^ a b c d e f g h i j k 3rd Generation Partnership Project (September 2012). "3GGP TS45.001: Technical Specification Group GSM/EDGE Radio Access Network; Physical layer on the radio path; General description". Retrieved 2013-07-20.  ^ 3rd Generation Partnership Project (June 2015). "3GGP TS45.001: Technical Specification Group GSM/EDGE Radio Access Network; Mobile Station (MS) - Base Station System (BSS) interface; Radio Link Control / Medium Access Control (RLC/MAC) protocol; section 10.0a.1 - GPRS RLC/MAC block for data transfer". 12.5.0. Retrieved 2015-12-05.  ^ 3rd Generation Partnership Project (June 2015). "3GGP TS45.001: Technical Specification Group GSM/EDGE Radio Access Network; Mobile Station (MS) - Base Station System (BSS) interface; Radio Link Control / Medium Access Control (RLC/MAC) protocol; section 10.2.1 - Downlink RLC data block". 12.5.0. Retrieved 2015-12-05.  ^ "EDGE, HSPA and LTE: The Mobile Broadband Advantage" (PDF). Rysavy Research and 3G Americas. 2007-09-01. pp. 58–65. Archived from the original (PDF) on 2009-10-07. Retrieved 2010-09-27.  ^ a b http://www.engadgetmobile.com/2009/09/14/nokia-siemens-fires-off-first-edge-evolution-downlink-dual-carrier/ ^ "GSA – The Global mobile Suppliers Association EDGE Databank". Gsacom.com. Retrieved 2013-03-05. 

External links[edit]

The Global mobile Suppliers Association Evolved EDGE as an alternative to 3G A technical document by the 3G Americas association An opinion on evolved EDGE by Martin Sauter An EDGE Evolution report by Visant Strategies Feasibility study for evolved GSM/EDGE Radio Access Network by 3GPP

v t e

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Cellular network
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List of mobile phone generations

0G (radio telephones)

MTS MTA - MTB - MTC - MTD IMTS AMTS OLT Autoradiopuhelin B-Netz Altai AMR

1G (1985)

AMPS family

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Other

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IEEE family

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LTE Advanced
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IEEE family

WiMAX
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5G (2020) (IMT-2020) (Under development)

LTE

 

5G-NR

 

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Cellular networks Mobile telephony History List of standards Comparison of standards Channel access methods Spectral efficiency comparison table Cellular frequencies (Bands: GSM UMTS LTE) Mobile broadband NGMN Alliance MIMO VoLTE

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