You can lock to Physical Cell ID in the 7000s since .105, I think, though I'm not sure about having a primary/secondary type setup. Still way better than just hardcoding a frequency and hoping for the best.
We tried moving to handover when we had some Telrad engineers on-site from Israel. We un-implemented it after two days, I think, before they left, and haven't tried since. I will say, however, that having primary/secondary EPCs set up in the ENBs is, as the kids said at one point, the bomb-diggity. In our tests, wherein we turn off the Ethernet port facing one EPC, the ENB will fail over to the secondary within about 20 seconds on average. Much nicer than what happens when your only EPC just goes away, in our experience, which is the majority of your UEs hang and require physical reboots. I'm not quite clear on exactly what happens when a primary EPC comes back; I think what happens is that the ENB notices it, starts using it for new connections, but doesn't move established UE connections back unless and until you issue an 'request enodeb-actions something-something-move-back-to-primary' type command. This takes a few seconds. I would like an option to gracefully remove an EPC from service, however; mark it as 'unavailable,' migrate connections off of it, then you can do whatever. Also, gracefully rebooting the EPC with a 'request reset reset,' which must do something graceful with existing connections, as it doesn't cause the stuck UE problem, doesn't seem to actually inform the ENBs that it's now technically unavailable. These things may all be there already, and I just haven't found them. From: [email protected] [mailto:[email protected]] On Behalf Of Nathan Anderson Sent: Tuesday, February 7, 2017 5:27 PM To: [email protected]; Adam Moffett Subject: Re: [Telrad] Handover Not us, yet. Haven't even tried wandering down that rabbit hole. I will note, though, that CPE8000 firmware has a vastly superior mechanism for locking to specific eNB than the 7000 does (at least currently), because it isn't based on frequency but rather Cell-ID. So you can change channels on your eNBs and your locked-down 8000s won't need to be reconfigured. And you can have multiple Cell-IDs in the preferred list, and the cell-lock can either be hard (only ever connect to this Cell-ID) or soft (prefer this Cell-ID; if it isn't available, feel free to connect to something else, but then check every X minutes to see if something in the preferred list happens to be broadcasting again). It'd be nice if this also came to the 7000 at some point, but then again if X2/handover is either working right now or close to working, maybe they consider putting more effort into the 7K firmware a waste of time. -- Nathan _____ From: [email protected] <[email protected]> on behalf of Adam Moffett <[email protected]> Sent: Tuesday, February 7, 2017 12:21 PM To: [email protected] Subject: [Telrad] Handover Is anybody using handover successfully? I'm looking for a way to keep UE on the best eNB without locking in specific frequencies.
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