Wireless Oom

WCDMA has 3.84 Mcps (chip per second).
One 10-ms radio frame is divided into 15 slots.
1000 ms has 3.84 10^6 chips
10 ms has 3.84 10^4 chips
15 slots have 3.84 10^4 chips
1 slot has 38400/15 = 2560 chips
downlink spreading factor from 4 to 256
uplink spreading factor from 4 to 512
With spreading factor 4,
1 slot has 2560/4 = [...]

First, think about the definition of spreading factor (SF): the number of chips for each symbol.
Second, remember that a chip duration is fixed.
Third, what is symbol? Each symbol can represent some amount of bits. e.g., QPSK, each symbol represents 2 bits.
SF: 2 SF vs. 512 SF
Time: 2*delta vs. 512*delta
Data: 1 symbol vs. 1 symbol
where delta [...]