alc handover types 1

8/11/2019 Alc Handover Types 1

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HANDOVER TYPESIN ALCATEL

(HANDOVER DETECTION /

HANDOVER THRESHOLD COMPARISON)


2/23

FIRST OF ALL

WHAT IS HANDOVER?Moving from one channel/cell to other channel/cell.

WHY CALLS NEED TO BE HANDED OVER?Due to mobility level or quality of serving cell degraded OR neighbor

cell(s) having better path loss.

Due to interferencemove to better channel/cell

Due to traffic

move to the unloaded cell(s).Change the channel OR cell to which is in better condition.

HOW MANY TYPES OF HO IN ALCATEL?Two main basics of HO types:

Experiencing bad level/quality (emergency) 12

Neighbor cells having better condition (better cell ho) 11


3/23

IN WHICH PART OF THE PROCESS?

The need for handovers often comes to compare a predefinedthreshold with a radio measurement. That is why this process is

sometimes called HO threshold comparison.


4/23

EMERGENCY HO (sorted by priority)

Cause 7 Bad SACCH frames Microcell

Cause 17 too low level UL MicrocellCause 18 too low level DL MicrocellCause 2 too low quality ULCause 4 too low quality DLCause 3 too low level ULCause 5 too low level DL

Cause 6 too long distance MS-BSCause 10 inner to outer ULCause 11 inner to outer DLCause 15 interference ULCause 16 interference DL


5/23

EMERGENCY HO Causes 7, 17, 18 Microcells

Parameters:EN_MCHO_RESCUE flag for enabling cause 7 ho

U_RXLEV_DL_MCHO Downlink level threshold for Microcell to Macrocell handoverU_RXLEV_UL_MCHO Uplink level threshold for Microcell to Macrocell handover.

EN_MCHO_H_UL flag for enabling level-ul-microcell ho cause 17EN_MCHO_D_DL flag for enabling level-dl-microcell ho cause 18

A_LEV_MCHO Window size for level averages for microcell handover.W_LEV_MCHO Weight applicable to level samples for microcell handover when no DTX is applied.


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Parameters:

L_RXQUAL_UL_H lower threshold on UL qualityL_RXQUAL_DL_H lower threshold on DL quality

RXLEV_UL_IH UL-lev thres. for decision b/w intra or inter cell HO of bad UL qual case.RXLEV_DL_IH DL-lev thres. for decision b/w intra or inter cell HO of bad DL qual case.

OFFSET_RXQUAL_FH=OFFSET_HOPPING_PC offset for hopping channels

EN_RXQUAL_DL flag enabling the dl quality hoEN_RXQUAL_UL flag enabling the ul quality ho

MS_TXPWR_MAX max power permitted for the mobilesBS_TXPWR_MAX max power permitted for the bts

A_QUAL_HO Window size for quality averages for handover

EMERGENCY HO Causes 2 and 4 too low quality UL/DL


7/23

Parameters:

L_RXQUAL_UL_H lower threshold on UL qualityL_RXQUAL_DL_H lower threshold on DL quality

L_RXLEV_UL_H UL lower threshold for HO.L_RXLEV_DL_H DL lower threshold for HO.

OFFSET_RXQUAL_FH=OFFSET_HOPPING_PC offset for hopping channels

EN_RXLEV_DL flag enabling the dl lev hoEN_RXLEV_UL flag enabling the ul lev ho

MS_TXPWR_MAX max power permitted for the mobilesBS_TXPWR_MAX max power permitted for the bts

A_LEV_HO Window size for level averages for handover

EMERGENCY HO Causes 3 and 5 too low level UL/DL


8/23

Parameters:

U_TIME_ADVANCE -> upper threshold for TA limit

EN_DIST_HO flag to enable the Distance HO

A_RANGE_HO windows size for Distance HO

EMERGENCY HO Cause 6 Too Long distance MS-BS


9/23

The above two handover causes are specific to concentric or multiband cell

configurations.

checked only if CELL_PARTITION_TYPE = CONCENTRIC, and

the active channel is a TCH, and

the ZONE_TYPE = INNER_ZONE (it means that the channel is in the inner zone

partition).

Parameters:

RXLEV_UL_ZONE -> lower threshold of ul rxlev as a border of UL innerzoneRXLEV_DL_ZONE -> lower threshold of dl rxlev as a border of DL innerzone

MS_TXPWR_MAX_INNER -> max power of ms in inner zone areaBS_TXPWR_MAX_INNER -> max power of bts in inner zone area

EMERGENCY HO Causes 10 and 11 Inner to Outer UL/DL


10/23

Parameters:

L_RXQUAL_UL_H lower threshold of UL rxqualL_RXQUAL_UL_H lower threshold of DL rxqual

OFFSET_RXQUAL_FH=offset_hopping_ho offset given for hopping channels

RXLEV_UL_IH UL-lev thres. for decision b/w intra or inter cell HO of bad UL qual case.RXLEV_DL_IH DL-lev thres. for decision b/w intra or inter cell HO of bad DL qual case.

EN_INTRA_UL flag to enable UL intra cell hoEN_INTRA_DL flag to enable DL intra cell ho

EN_INTRACELL_REPEATED flag to enable repeating the intracell ho

EMERGENCY HO Causes 15 and 16 Interference UL/DL


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BETTER CELL HO (sorted by priority)

Cause 21 preferred band ho

Cause 14 speed discriminationCause 12 power budget hoCause 13 outer to inner hoCause 20 forced directed retryCause 25 GPRS redirectionCause 23 traffic ho

Cause 24 general capture hoCause 26 hr to fr due to bad qualityCause 27 fr to hr due to good qualityCause 28 fast traffic ho


12/23

BETTER CELL HO Cause 21 preferred band ho

Parameters:

MULTIBAND_TRAFFIC_CONDITION values of ANYLOAD, LOW or HIGH

L_RXLEV_CPT_HO (0,n) min rxlev from neighbor-cells for this capture HO

MS_TXPWR_MAX permitted maximun power of mobiles

EN_PREFERRED_BAND_HO flag for enabling preferred band HO


13/23

BETTER CELL HO Causes 14 speed discrimination

Parameters:

L_RXLEV_CPT_HO(0,n) min rxlev from neighbor-cells for this capture HO

EN_MCHO_NCELL flag enabling this HO


14/23

BETTER CELL HO Cause 12 (1) power budget ho TCH to TCH

Parameters:HO_MARGIN(0,n) different pbgt b/w serving and neighbor-cellsOFFSET_HO_MARGIN_INNER offset given to inner zone

DELTA_HO_MARGIN(0,n)DELTA_DEC_HO_MARGIN correction factor for condition high load in serving cell and lessload in neighbor cell(s)DELTA_INC_HO_MARGIN correction factor for condition less load in serving cell and high

load in neighbor cell(s)

RXLEV_LIMIT_PBGT_HO limit of rxlev above which no need for pbgt ho

EN_PBGT_HO flag enabling this pbgt-HO


15/23

BETTER CELL HO Cause 12 (2) power budget ho SDCCH to SDCCH

Parameters:

HO_MARGIN(0,n) different pbgt b/w serving and neighbor cells

RXLEV_LIMIT_PBGT_HO limit of rxlev above which no need for pbgt ho

EN_PBGT_HO flag for enabling this HO


16/23

BETTER CELL HO Cause 13 outer to inner ho

Parameters:

RXLEV_UL_ZONE Uplink level threshold for inner to outer zone handover.

RXLEV_DL_ZONE Downlink level threshold for inner to outer zone handover.

ZONE_HO_HYST_UL Hysteresis applied to RXLEV_UL_ZONE for outer to inner zonehandover.ZONE_HO_HYST_DL Hysteresis applied to RXLEV_DL_ZONE for outer to inner zonehandover.

MS_TXPWR_MAX_INNER maximum mobile power permitted in inner zone

BS_TXPWR_MAX_INNER maximum bts power permitted in inner zone

NEIGHBOR_RXLEV(0,n) Threshold of maximum received level from the neighbour cells forcause 13.

EN_BETTER_ZONE_HO flag for enabling this HO


17/23

BETTER CELL HO Cause 20 forced directed retry

Parameters:

L_RXLEV_NCELL_DR(n) Minimum level received from neighbour cell n to allow forceddirected retry to cell n.

EN_FORCED_DR flag for enabling force directed retry

A_PBGT_DR Window size for neighbour cell level averages for forced directed retry.


18/23

BETTER CELL HO Cause 25 GPRS redirection

Parameters:



19/23

BETTER CELL HO Cause 23 traffic ho

Parameters:

HO_MARGIN(0,n) different in PBGT b/w serving and neighbor cell(s)OFFSET_HO_MARGIN_INNER offset given to inner zone

DELTA_HO_MARGIN(0,n)

DELTA_DEC_HO_MARGIN correction factor for condition high load in serving cell and lessload in neighbor cell(s)DELTA_INC_HO_MARGIN correction factor for condition less load in serving cell and highload in neighbor cell(s)

EN_TRAFFIC_HO(0,n) flag for enabling this HO


20/23

BETTER CELL HO Cause 23 general capture ho

Parameters:

CAPTURE_TRAFFIC_CONDITION values of ANYLOAD, LOW or HIGH

L_RXLEV_CPT_HO(0,n) min rxlev from neighbor-cells for this capture HO

MS_TXPWR_MAX maximum mobile power permitted

EN_GENERAL_CAPTURE_HO flag for enabling this HO


21/23

BETTER CELL HO Cause 26 hr to fr due to bad quality

Parameters:

THR_RXQUAL_CA_NORMAL Threshold for channel adaptation under normal load.THR_RXQUAL_CA_HIGH Threshold for channel adaptation under high load.OFFSET_RXQUAL_FH offset given for hopping channels/cellsOFFSET_CA_NORMAL/HIGH Offset for AMR channel adaptation hysteresis under normal/highload.RXLEV_UL_IH UL-lev thres. for decision b/w intra or inter cell HO of bad UL qual caseRXLEV_DL_IH UL-lev thres. for decision b/w intra or inter cell HO of bad UL qual caseEN_AMR_CA flag for enabling this HO


22/23

BETTER CELL HO Cause 27 fr to hr due to good quality

Parameters:

THR_RXQUAL_CA_NORMAL Threshold for channel adaptation under normal load.

THR_RXQUAL_CA_HIGH Threshold for channel adaptation under high load.

OFFSET_RXQUAL_FH offset given to hopping channel

EN_AMR_CA flag for enabling this HOEN_AMR_HR flag for enabling this HO


23/23

BETTER CELL HO Cause 28 fast traffic HO

Parameters:


FREElevel_DR(n) Minimum number of free TCHs in neighbour cell n to allow forceddirected retry to cell n.

EN_CAUSE_28 flag for enabling fast traffic HO

alc handover types 1

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