殘酷的4G : 寬頻網路背後的戰爭 = The battle behind broadband brutal 4G

some backhaul bandwidth calculation

2G - per antenna/basestation 5Mbps
5Mhz - GSM carrier -200kHz = 25 carriers
7 channels per carrier -> so 175 channels

HSPA+ 22/42 Mbps ( up/down) (using  5Mhz)
LTE 86/326 Mbps ( if 20Mhz)

how much bandwidth improvement via LTE 20Mhz( who has 20Mhz?)

LTE design for telecom - key objective is latency
LTE still is highly telecom optimized( why using expensive telecom oriented
network technology to serve internet traffic?

- Do we really need 10ms or even 1ms latency?

bad baby discipline ( 壞寶寶)- spend huge efforts to serve poor quality users

Wide LTE deployment is because of WiMAX competition

WiMaz ( since 2000- called Worldwide interoperability of "microwave" access)
- it was backhaul microwave technology
802.16d fixed WiMAX

then mobile WiMax 802.16e ( by Sprint)

Why Intel promoted WiMax/WiFi -> push more computing requirements
-- same as virtualzation or NFV ......

Qulacomm was the killer to WiMax

Death of WiMax
- Sprint+interl mobile WiMax
- China denied Wimax (
- Loss of India support ( Qualcomm)