TelecomStudy18

The WCDMA/GSM GPRS system supports end-users wishing to access the Internet and Intranets using a WCDMA UE or GPRS MS as the connecting device. Some examples of user applications enabled by 3G are given below: ·           Video Telephony and Video Conferencing ·           Broadband Web Browsing and Multimedia Streaming; for  example, video clips, news on demand and music ·          Mobile Broadband ·           Multimedia Messaging (voice mail with pictures) ·           Location-based Servic Additionally, all data services enabled by 2.5G technologies will also be available. For example, some horizontal applications enabled by 2.5G are: ·           E-mail ·           Internet chats ·           File transfer using the File Transfer Protocol (FTP) ·           Point of sale (credit card readers) ·          Database searches ·          Two-way messaging

General on-demand PDCH allocation as a new PSET (not for individual MS support), can be performed only in the BCCH frequency band if the parameter MBCRAC is set to 0 (default value). To allow general on demand allocation of PDCHs in other bands in a cell MBCRAC must be set to 1 or 2. Extension of an already existing on-demand PSET is however generally allowed regardless of the MBCRAC setting. The maximum number of on-demand PDCHs per channel group can be limited by the parameter ODPDCHLIMIT . At allocation of on-demand PDCHs, the requested number of channels (or as many as available and allowed) are selected within the allowed frequency band(s) and subcell(s) according to the following algorithm: 1 In the case of adding PDCHs to a PSET, then select the TCHGRP where the other PDCHs in the PSET are located. Then proceed to step 10. 2 Among all TCHGRPs, select the TCHGRPs that have the best idle rank value for E-TCH. 3 Among these TCHGRPs, select the TCHGRPs that hav

TBFDCDLCAP :  Number of downlink TBFs where the MS is capable of using dual carriers. TRAFDCDLTBF :   Number of downlink TBFs, in EGPRS mode, reserved on dual carriers. MAXDCTSDL :  Maximum possible number of time slots reservable for MSs on downlink TBFs in EGPRS mode, reserved on dual carriers. MUTILDCDL :  Sum of percentage shares of reserved time slots for all EGPRS mode downlink TBFs reserved on dual carriers related to the maximum possible reservable time slots. TRAFEEVOSCAN :  Number of scans for the counters in this object type. This counter is only valid for counters in object type TRAFEEVO. TSDCDL:  Number of time slots with one or more uplink or downlink TBFs currently reserved on dual carriers.

TRAFFULGPRSSCAN Total number of scans (accumulations). TBFULGPRS Accumulated number of Basic and GPRS mode UL TBFs (active users), for all types of traffic, including effective streaming PDCH and PDCH used for EIT, in the cell. TBFULEGPRS Accumulated number of EGPRS mode UL TBFs (active users), for all types of traffic, including effective streaming PDCH and PDCH used for EIT, in the cell. ULBPDCH Accumulated number of B-PDCH that carried one or more UL TBFs of any mode in the cell (a B-PDCH used on the UL). Valid for all types of traffic, including effective streaming PDCH and PDCH used for EIT. ULGPDCH Accumulated number of G-PDCH that carried one or more UL TBFs of any mode in the cell (a G-PDCH used on the UL). Valid for all types of traffic, including effective streaming PDCH and PDCH used for EIT. ULEPDCH Accumulated number of E-PDCH that carried one or more UL TBFs of any mode in the cell (an E-PDCH used on the UL). Valid for all types of traffic, includi

TRAFFDLGPRSSCAN Total number of scans (accumulations). TBFDLGPRS Accumulated number of Basic and GPRS mode DL TBFs (active users), for all types of traffic, including effective streaming PDCH and PDCH used for EIT, in the cell. TBFDLEGPRS Accumulated number of EGPRS mode DL TBFs (active users), for all types of traffic, including effective streaming PDCH and PDCH used for EIT, in the cell. DLBPDCH Accumulated number of B-PDCH that carried one or more DL TBFs of any mode in the cell (a B-PDCH used on the DL). Valid for all types of traffic, including effective streaming PDCH and PDCH used for EIT. DLGPDCH Accumulated number of G-PDCH that carried one or more DL TBFs of any mode in the cell (a G-PDCH used on the DL). Valid for all types of traffic, including effective streaming PDCH and PDCH used for EIT. DLEPDCH Accumulated number of E-PDCH that carried one or more DL TBFs of any mode in the cell (an E-PDCH used on the DL). Valid for all types of traffic, includi

PDCHs may also be used by TBFs in Dual Transfer Mode (DTM). The DTM TBFs may either use PDCHs already allocated for normal GPRS/EGPRS traffic or trigger allocation of additional PDCHs that then can be used for normal GPRS/EGPRS traffic too. Some PDCHs can later be returned to the CSD when they are no longer needed, or when CS traffic or Abis demand requires it. There are different types of PDCHs; dedicated PDCHs, semi-dedicated PDCHs and on-demand PDCHs. Dedicated PDCHs: The number of dedicated PDCHs in a cell is set by the operator. These PDCHs are allocated at configuration from the CSD to the PSD for GPRS/EGPRS traffic and can then not be pre-empted by CS traffic. A GSL resource and an Abis resource is allocated at the time of allocation. The number of dedicated PDCHs can only be decreased by the operator. Semi-dedicated PDCHs: The number of semi-dedicated PDCHs in a cell is also set by the operator. These PDCHs are allocated at configuration from the CSD to

Active Queue Management (AQM) is a queue management feature for the downlink. For applications using TCP/IP as transmission (e.g. FTP, web browsing, email), it is important with a rapid feedback of the radio link data rate to the TCP/IP protocol. Feedback of the radio link data rate is reported to TCP/IP by discarding IP-packets. In this way the TCP/IP protocol will faster adjust its send rate according to the radio link capacity and TCP slow-starts are avoided. If the feature “QoS and Scheduling” in BSC is active (R97 QoS and/or R99 QoS), the queue management feature is applied to Interactive class and Background class data. The queue management feature is not applied to signalling messages, SMS, LLC acknowledged mode data, EIT data or Streaming class data when QoS is active. For SMS, signalling messages, LLC acknowledged mode data, EIT data and Streaming class data a maximum buffer is set and when the buffer is overflowed packets are discarded starting from front of the buffer

(E)GPRS Network Infrastructure How to calculate what •           No. of EGPRS resources used in 1 sector * No. of sectors : 2 x 3 •            No. of time slot/sector * no of time slot used for EDAP :- 2 * 3 = 6 •           So total time slots per site 6 + 6 = 12 •           1 NSEI support 256 time slot with upgrade % as 10 so total no of time slots which can be equipped is 256 - 10% of 256 = 230.4 ~ 230 •           So no. of sites per NSEI is 230/12 = 19.16 ~ 19 •           So no NSEI required / BSC :  100 / 19 = 5.2 +1 (for future use) ~ 6 •           2 NSEI supports 1 BCSU so no. of PCU required : 6/2 = 3 •           No. of NSEI required is equivalent to the no. of Gb link = 3 •           On 1 E1 we can get 31x64 = 1984 , so access rate can be given by 1 E1 = 1984/ access rate (256) = 1984 / 256  ~  7 Transmission requirement for EGPRS coding schemes in Abis interface EDGE modulations     Scheme Modula