Huzzah thread revive!
Like many others have said: Radios and Comms are #1
Personally I'm a big fan of having a squad net and a command net. One quick blast on the squad net of "you're in charge now" means that you'll get your replacement squad leader reaching up to command pretty darn quick.
After the respawn: having a radio connection on the squad net means you're much more likely to track them down and regroup easily.
I like the knots idea, but I'm usually pretty hesitant when it comes to field respawns. Especially when dealing with objectives or tight spaces.
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