4G - Wireless Beyond Third Generation Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : 4G - Wireless Beyond Third Generation

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: axial who wrote (909)	7/31/2008 11:46:23 AM
From: slacker711	Read Replies (1) of 1002

This is the first reference seen to high power usage/battery drain on VoIP calls with 3G. The extra processing load for VoIP is known. But the problems seem excessive; are they peculiar to the author's circumstances (eg handset, network, etc) or can the problem be generalized to all VoIP calls? Yes, that's what the author is saying, but is he correct? I knew there were problems with VoIP on mobile networks, but didn't think they were that bad. I hadnt realized the problems either. A quick search reveals that most of the people that are currently using VoIP on handsets are using it in conjunction with WiFi. This presentation from Nokia seems to confirm that the battery life problems are universal and related to NAT. v6summit.com Mobile phones are often behind NATs • Applications that keep connections open for a long time need to keep UDP mappings in NATs alive by sending keep alive messages • Always-on applications for phones are emerging and becoming popular, thus further increasing the number of applications that need to have connections open all the time • multiple of such applications maybe running on the same device Sending of NAT keep-alives once in 30 seconds decreases cellular phone standby time by several days • Problem is more severe for WCDMA technology than for WLAN, as it is more resource consuming to bring radio interface up for WCDMA Personally, I would guess that multimode devices will be standard for a very very long time so there will be plenty of opportunities to solve the issues. Slacker

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next