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【正文】 n:– BSIC in same site can be decoded but not for other sites– Handover can only happen in intrasite basis– It is similar to former Undecoded BCCH caseReason:– GCLK shift? GCLK recalibration is required? No one monitors OMCR alarmsDate 11No Handover (1)Description:– Neighbor BSIC is decoded and COMMON handover requirement is fulfilled but there is never a handoverReason:– Missing neighbor? No such neighbor in CM database– Incorrect external neighbor? Target cell’s LAC/BCCH/BSIC in add_neighbor is different from those in equip_rtf? Engineer modifies external neighbor at MMI, not through GUI? Never use OMCR Proxy Cell to propagate external neighbor information– N hreqt. Great HO_MARGIN. Improper algorithm 17 setting– Missing_rpt =1– Serving cell overshoots/covers too far away– Refer to GSM BSS Statistics Analysis HandbookDate 12No Handover (2)Date 13Delay Handover (1)Description:– Neighbor BSIC is decoded but handover occurs in much later timeReason:– All possible neighbors suffer blocking– Large hreqt * hreqave– qual_power_flag is enabled, full BTS/MS power must be reached before handover– Large handover_recognized_period and bssmap_t7 setting– Refer to GSM BSS Statistics Analysis HandbookDate 14Delay Handover (2)Date 15Ping Pong Handover (1)Description:– Lot of handovers between cells– “Time between Handover” is around hreqt*hreqave of such HO causeReason:– Improper hardware calibration– Hardware fault– UL/DL interference– Negative handover– Different coverage footprint for antennas of a cellDate 16Ping Pong Handover (2)Date 17Negative Handover (1)Description:– Serving cell hands over to a
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