Editing GPRS (section)

=== Multislot Class ===
The multislot class determines the speed of data transfer available in the [[Uplink]] and [[Downlink]] directions. It is a value between 1 and 45 which the network uses to allocate radio channels in the uplink and downlink direction. Multislot class with values greater than 31 are referred to as high multislot classes.

A multislot allocation is represented as, for example, 5+2. The first number is the number of downlink timeslots and the second is the number of uplink timeslots allocated for use by the mobile station. A commonly used value is class 10 for many GPRS/EGPRS mobiles which uses a maximum of 4 timeslots in downlink direction and 2 timeslots in uplink direction. However simultaneously a maximum number of 5 simultaneous timeslots can be used in both uplink and downlink. The network will automatically configure for either 3+2 or 4+1 operation depending on the nature of data transfer.

Some high end mobiles, usually also supporting [[UMTS]], also support GPRS/[[EDGE (telecommunication)|EDGE]] multislot class 32. According to [[3GPP]] TS 45.002 (Release 12), Table B.1,<ref name="TS45002">{{cite web |url=http://www.3gpp.org/ftp/Specs/html-info/45002.htm |title=3GGP TS45.002: Technical Specification Group GSM/EDGE Radio Access Network; Multiplexing and multiple access on the radio path (Release 12) |version=12.4.0 |author=3rd Generation Partnership Project |date=March 2015 |access-date=2015-12-05}}</ref> mobile stations of this class support 5 timeslots in downlink and 3 timeslots in uplink with a maximum number of 6 simultaneously used timeslots. If data traffic is concentrated in downlink direction the network will configure the connection for 5+1 operation. When more data is transferred in the uplink the network can at any time change the constellation to 4+2 or 3+3. Under the best reception conditions, i.e. when the best EDGE [[modulation and coding scheme]] can be used, 5 timeslots can carry a bandwidth of 5*59.2&nbsp;kbit/s = 296&nbsp;kbit/s. In uplink direction, 3 timeslots can carry a bandwidth of 3*59.2&nbsp;kbit/s = 177.6&nbsp;kbit/s.<ref>{{Cite web |url=http://mobilesociety.typepad.com/mobile_life/2007/04/gprs_and_edge_m.html |title=GPRS and EDGE Multislot Classes |access-date=2010-06-21 |archive-url=https://web.archive.org/web/20101127153600/http://mobilesociety.typepad.com/mobile_life/2007/04/gprs_and_edge_m.html |archive-date=2010-11-27 |url-status=dead }}</ref>

==== Multislot Classes for GPRS/EGPRS ====
:{| class="wikitable"
! Multislot Class
! Downlink TS
! Uplink TS
! Active TS
|- style="text-align:center;"
| 1
| 1
| 1
| 2
|- style="text-align:center;"
| 2
| 2
| 1
| 3
|- style="text-align:center;"
| 3
| 2
| 2
| 3
|- style="text-align:center;"
| 4
| 3
| 1
| 4
|- style="text-align:center;"
| 5
| 2
| 2
| 4
|- style="text-align:center;"
| 6
| 3
| 2
| 4
|- style="text-align:center;"
| 7
| 3
| 3
| 4
|- style="text-align:center;"
| 8
| 4
| 1
| 5
|- style="text-align:center;"
| 9
| 3
| 2
| 5
|- style="text-align:center;"
| 10
| 4
| 2
| 5
|- style="text-align:center;"
| 11
| 4
| 3
| 5
|- style="text-align:center;"
| 12
| 4
| 4
| 5
|- style="text-align:center;"
| 30
| 5
| 1
| 6
|- style="text-align:center;"
| 31
| 5
| 2
| 6
|- style="text-align:center;"
| 32
| 5
| 3
| 6
|- style="text-align:center;"
| 33
| 5
| 4
| 6
|- style="text-align:center;"
| 34
| 5
| 5
| 6
|}

==== Attributes of a multislot class ====
Each multislot class identifies the following:
* the maximum number of Timeslots that can be allocated on uplink
* the maximum number of Timeslots that can be allocated on downlink
* the total number of timeslots which can be allocated by the network to the mobile
* the time needed for the MS to perform adjacent cell signal level measurement and get ready to transmit
* the time needed for the MS to get ready to transmit
* the time needed for the MS to perform adjacent cell signal level measurement and get ready to receive
* the time needed for the MS to get ready to receive.

The different multislot class specification is detailed in the Annex B of the 3GPP Technical Specification 45.002 (Multiplexing and multiple access on the radio path)