How are the handoffs (between frequencies) supposed to work?

[airs0ft3r]

Hey guys,

 

Long time lurker, first time poster.

 

I have a question about how the phones will handle the handoffs between the 800, 1900, and 2500 bands. Currently, the switch to 4G to 3G or 3G to 4G is anything but seamless. Websites and media stop loading during the handoffs. When NV is fully implemented, do we expect the phones to have stability between the frequencies?

[sprintfans]

good question. I think between 800 and 1900 it should be. not sure about 2500 as it will probably generate different ip unless if it is 2500 hosted by sprint itself.I know there are chips which do seamless switch between FD and TD but in our scope TD is hosted by different company(subsidiary of sprint)

[NiteSnow]

eHRPD exists for CDMA to LTE hand-off, WiMax to EvDO is impossible because no hand-off technologies exist. 3G to WiMax and WiMax to 3G hand-off probably doesn't have a hand-off method/technology to my knowledge. 3G is ran by Sprint and WiMax is ran by Clearwire, there's latency and involved that could possibly cause problems. LTE should be able to handle hand-off from carrier to carrier without issue regardless of frequency.

[irev210]

good question. I think between 800 and 1900 it should be. not sure about 2500 as it will probably generate different ip unless if it is 2500 hosted by sprint itself.I know there are chips which do seamless switch between FD and TD but in our scope TD is hosted by different company(subsidiary of sprint)

 

I've heard it both ways. A few on this forum have said it can't be done because of the different gateways/networks/etc.

 

However, the guys over at clearwire have said that it will be a "seemless" handoff (they've even said they will support VoLTE).

 

Personally, I am very interested how this is going to roll out.

[sprintfans]

I've heard it both ways. A few on this forum have said it can't be done because of the different gateways/networks/etc.

 

However, the guys over at clearwire have said that it will be a "seemless" handoff (they've even said they will support VoLTE).

 

Personally, I am very interested how this is going to roll out.

if it is seamless

I dont know if TD works good while on the move..if it does not then there should be option to toggle switch on and off 2500.

[S4GRU]

if it is seamless

I dont know if TD works good while on the move..if it does not then there should be option to toggle switch on and off 2500.

 

TDD works fine while moving. In the Sprint/Clearwire program documents for system planning between their FD-LTE and Clearwire's TD-LTE, the systems are being coordinated to handoff to each other while in motion. How successful it will work remains to be seen, but they are planning for it.

 

Robert via Kindle Fire using Forum Runner

[bigsnake49]

While handoffs work much better when both share the same network, it can be made to work between completely different networks. The device must be registered on both networks. In this case, most of the device handoff logic resides on the device itself. CDMA 1x and EVDO have the capability, but the CDMA vendors have chosen not to implement it.