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1、NetworksNetworksEGPRS EGPRS 相关参数介绍相关参数介绍BSC LEVELBSC LEVEL2 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials3 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / InitialsGTUGTGTUGTBSC LevelGPRS territory update guard time (GTUGT) Q3 name: terrUpdateGuardTimeGPRS Modification: Online Range: 1 . 255 (s) MML d
2、efault: 5 Description: With this parameter you set the timer, which must elapse between two subsequent territory updates. Related command(s): EEN, EEO Recommended value: default. Planning: Too high value causes low throughput (the time is too long to wait for triggering territory update), while too
3、low value can generates high signaling. MNDLMNDL4 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / InitialsBSC LevelMaximum number of DL TBF (MNDL) Q3 name: PcuMaxNoDLtbfInCH Modification: Online Range: 1 9 MML default: 9 Description: With this parameter you define the maximum number of TBFs that a radio t
4、ime slot can have in average, in a GPRS territory, in the downlink direction. Related command(s): EEQ, EEO Recommended value: default. Planning: There is no any reason to reduce this paremeter from 9 to lower value. MNULMNUL5 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / InitialsMaximum number of UL TBF
5、 (MNUL) Q3 name: PcuMaxNoULtbfInCH Modification: Online Range: 1 7 MML default: 7 Description: With this parameter you define the maximum number of TBFs that a radio time slot can have in average, in a GPRS territory, in the uplink direction. Related command(s): EEQ, EEO Recommended value: default.
6、Planning: There is not any reason to reduce this parameter from 7 to lower value. These parameters cannot have values higher than nine and seven, respectively. This restriction is brought about by the number of available timing advance indexes and USF values: the number of available USF values limit
7、s the number of UL TBFs to seven per timeslot; the number of available timing advance indexes is 16 including both UL and DL TBFs, which means that the maximum number of UL TBFs being seven there can be at most nine DL TBFs. BSC LevelMNDLMNDL6 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / InitialsMaximu
8、m number of DL TBF (MNDL) Q3 name: PcuMaxNoDLtbfInCH Modification: Online Range: 1 9 MML default: 9 Description: With this parameter you define the maximum number of TBFs that a radio time slot can have in average, in a GPRS territory, in the downlink direction. Related command(s): EEQ, EEO Recommen
9、ded value: default. Planning: There is no any reason to reduce this paremeter from 9 to lower value. BSC LevelCSUCSU7 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / InitialsFree TSL for CS upgrade (CSU) Q3 name: FreeTSLsCsUpgrade Modification: Online Range: 0 - 10 (s) MML default: 4 Description: With thi
10、s parameter you define a period following a GPRS upgrade during which the probability for a GPRS downgrade in a BTS should be no more than 5%. Based on the given time and the size of a BTS (number of TRXs) the BSC defines a margin of idle TSLs that is required as a condition for starting a GPRS terr
11、itory upgrade in the BTS. A GPRS upgrade may be done if the number of free TSLs in a BTS is at least equal to the defined margin still after the upgrade. In the margin definition the BSC uses a table that is shown in “GPRS territory upgrade“ of “GPRS in BSC“. Related command(s): EEM, EEO Recommended
12、 value: default BSC LevelFree TSL for CS upgrade (CSU)With this parameter you define a period following a GPRS upgrade during which the probability for a GPRS downgrade in a BTS should be no more than 5%. Default value for the period length is 4 4 seconds.seconds.BSC LevelCSDCSD9 2005 Nokia V1-Filen
13、ame.ppt / yyyy-mm-dd / InitialsFree TSL for CS downgrade (CSD) Q3 name: FreeTSLsCsDowngrade Modification: Online Range: 0 - 100 (%) MML default: 95 Description: The parameter gives a target probability of TCH availability for circuit switched services in a BTS with GPRS territory. Based on the given
14、 probability and the size of a BTS (number of TRXs) the BSC defines a margin of idle TCHs that it tries to maintain free for the incoming circuit switched TCH requests in the BTS. If the number of idle TCHs in the circuit switched territory of a BTS decreases below the defined margin a GPRS territor
15、y downgrade is started. In the margin definition the BSC uses a table that is shown in “GPRS territory downgrade“ of “GPRS in BSC“. Related command(s): EEM, EEO Recommended value: default BSC LevelFree TSL for CS downgrade (CSD)That means that if we have 4TRXs/cell and at a certain moment we have a
16、decreased number of TSLs for example the number of idle TSLs falls to 1 the associated probability of being free is 93%, less than the threshold (95%), that means that a GPRS downgrade will be startedBSC LevelMEMORY_OUT_FLAG_SUM MEMORY_OUT_FLAG_SUM 11 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / InitialsMEMORY_OUT_FLAG_SUM (Parameter 046:0046) Value Meaning 0 Deactivates algorithm use. Default value(s): SX: 3D Allowed values: 0-7D The
