The New Qualcomm - write what you like thread. Message Board

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Pastimes : The New Qualcomm - write what you like thread.

QCOM 173.20

-3.3%

Nov 6 3:59 PM EST

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To: S100 who wrote (3908)	12/16/2001 11:29:05 AM
From: foundation	Read Replies (1) of 12231

"..Async WCDMA has to use much wider search windows to find the other base stations.." ---------- <snip> Basically the chip rate of WCDMA is 3.125 times as IS-95 CDMA (that is, 3.84/1.2288). So the basic uplink handover search window of WCDMA should be almost 3 times than IS-95 based systems. As stated in the previous page, typical uplink handover search window for IS-95 base system is 60~80 chips. So the one for WCDMA may be 187.5~250 chips. This is only based on the assumption that the network can estimate the round trip delay between UE and target BS before the handover execution. Unfortunately in the WCDMA, it is basically impossible to estimate the round trip delay so that the uplink handover search window should be the sum of maximum round trip delay and delay spread [2]. If we assume the coverage of target cell is 10 km, then the uplink handover search window for that cell should be 300~400 chips. And if we assume the coverage of the cell as 40 km, then the search window should be larger than 1000 chips. Message 15980502

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