HSPA Data Rates Calculation
February 3, 2010 by admin
Filed under Uncategorized
People often get lost while calculating the data rates for HSDPA, HSUPA or HSPA+
Note: HSPA+ is better known as eHSPA or HSPAe where e stands for evolution or evolved
Most people are aware that the theoretical maximum for HSDPA is 14.4Mbps, so lets see how we reach 14.4Mbps:
In UMTS, in each slot the maximum number of bits transmitted is 2560. The correct term to use is chips rather than bits. If you want to know where this 2560 comes from or why chips then please refer 3GPP TS 25.211
There are 15 slots per 10ms frame so since the TTI for HSDPA is 2ms, there will be 3 slots. So there will be a total of 7680 chips.
QPSK has 2 bits per symbol = 7680 * 2 chips for 2ms = 15360 chips/2ms = 15360 * 1000 /2 chips per second
Now the SF is fixed at 16
= (15360 * 1000) / (2 * 16)
= 480 Kbps
Terminal that uses 15 QPSK codes will get 480 * 15 = 7.2Mbps
On other hand 16 QAM will have 4 bits per symbol so the rate would be 7.2 * 2 = 14.4Mbps
In HSPA+ we will also have 64QAM which has 6 bits per symbol (2^6 = 64) so the max rate would be 7.2 * 3 = 21.6Mbps.
Incoming search terms for the article:
- irex dr800sg protective sleeve
- hsdpa calculation
- hsdpa calculations
- 3gsm data rates
- max data rate calculation hsdpa
- lte data rate calculations
- lte data rate calculation
- hsupa data rates calculation
- hsdpa total data rate
- hsdpa rates
Powered by
Comments
Tell us what you're thinking...
and oh, if you want a pic to show with your comment, go get a gravatar!