[信息與通信]tems基礎(chǔ)知識(參考版)
2025-01-22 09:29本頁面
【正文】 delay handoverDate 26Poor Coverage (2)Date 27Unreasonable Serving Area (1)Description:– Coverage area of the cell is incoherent to the antenna directionReason:– Wrong cable connection to antennas– Incorrect record of antenna orientation– Incorrect ANTENNA_SELECTDate 28Unreasonable Serving Area (2)Cell ID:101BCCH: 35Cell ID:102BCCH: 40Cell ID:103BCCH: 45Date 29Interference (1)Description:– High rxlevel with rxqualityReason:– Channel interference– Not using dominant server– No handover– Turn the corner with delay handoverDate 30Interference (2)Date 31Handover Failure (1)Description:– MS fails to reach target cell, so return to source cell– MS sends HO FAILURE and ULSABM to source cell and there is responseReason:– Channel interference– Poor coverage– External interference at UL, like wideband repeator– Refer to GSM BSS Statistics Analysis HandbookDate 32Handover Failure (2)Date 33Handover Loss (1)Description:– MS fails to reach target cell, but can’t return to source cell– MS sends HO FAILURE and ULSABM to source cell but no responseReason:– Channel interference– Poor coverage– External interference at UL, like wideband repeator– Refer to GSM BSS Statistics Analysis HandbookDate 34Handover Loss (2)Date 35Description:– BSS doesn’t receive UL SACCH for link_fail times– BSS stops transmitting DL powerReason:– External interference– Channel interference– Faulty ancillary. UL path loss DL path loss– Refer to GSM BSS Statistics Analysis HandbookUL Drop (1) Date 36UL Drop (2) Date 37Drop Call (1)Description:– DL case: Radio_link_timeout counter decreases to 0– UL case:
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