3G is a 'brand' for getting new spectrum from regulators, not a more efficient use of existing spectrum.
Thanks Peter for stating plainly the real goals of the 3g proponents. In a world free from lobbyists and contributions, the spectrum would go to people that can make a business case for it, not those that come up with the grandest, most far-fetched plans. Seems to me the computing/networking sector has a better grasp on rolling out the wired internet and have a batch of business applications that lend themselves to wireless extension, today. We'll see.
The QCOM thread are starting to get all lathered up over the possibility for CDMA evolution (1XDO->1XDV?) being used in MMDS bands, not to mention some startup companies now touting TD-SCDMA for MMDS. Any comments on where carriers are looking or is it really all up in the air right now (pun intended :-/).
I noticed that ETSI BRAN recently sent a letter to the IEEE indicating that for their HiperMAN BWA standard, they chose IEEE802.16a/b OFDM for the PHY layer with some mods. from the BWIF spec, indicating that they would likely bypass the single carrier option that the IEEE left on the table in their spec.
ETSI BRAN HIPERMAN selects 802.16 MAC and tentatively selects OFDM portion of 802.16 2-11 GHz PHY plan as baseline. The group was "motivated by the goal to provide one interoperable worldwide standard for the 2-11 GHz licensed bands."
___________________________________________________________________
The HIPERMANgroup has decided as follows:
1. DLC base-line:
- MAC relevant chapters from the documents IEEE P802.16/D5-2001 and P802.16ab-01/01r2.
2. PHY working assumption:
- OFDM PHY from IEEE 802.16a document IEEE P802.16ab-01/01r2,
- BWIF chapter referring to diversity, from Radio Frequency Interface Specification, SP-WRFI-000829, Version 1.0, as was submitted to ETSIHIPERMAN.
The final decision of selecting OFDM vs. Single Carrier PHY will be made during BRAN#26 (Dec. 4-7, 2001).
These conclusions were motivated by the goal to provide one interoperable worldwide standard for the 2-11GHz licensed bands.
grouper.ieee.org
grouper.ieee.org
Seems to me that in all-IP network deployment/environment, OFDM has an edge over CDMA; if VoIP is in fact to be successful, why have dedicated voice - it's just a high priority app isn't it? Why not connect all those OFDM-based WLAN hotspots with OFDM-based BWA? Does this approach marginalize data in the WAN - making 2.5g adequate for the foreseeable future?
As always, your insights are greatly appreciated. Rob |
