What are the common tips for configuration
Followings are configurations that would most commonly referenced.
How to change the frequency used by the system ?
> I have the frequency or the band of my network, but I don't know how to configure it
Frequency can be defined with EARFCN and this is how it is configured in eNB.
- You need to convert your frequency to EARFCN. You can refer to this site.
- Edit enb.cfg file and change earfcn to this value.
- If you have manually started eNB, just quit it and start it again, else type "service lte stop; service lte start"
Multi PDN setup. One UE with two PDNs activated
> I’m trying to setup a scenario where one UE is connected to two PDNs. I’ve added another array element for pdn_list but the UE does not connect to second PDN.
This is a normal LTE behaviourwo.
When attached UE will only connect to one PDN (default).
It is up to the UE to connect to other PDN.
Diversity setup
> I’ve only tested SISO so far.> You provided MIMO sample files but not diversity.> Setting up diversity would be as easy as changing the number of UL antennas to 1?>
MIMO is a bit ambiguous as it is part of diversity.You can test it by setting transmission mode (Check in eNB doc, transmission_mode parameter).But if you use USRP SDR card such as N210, you will need two devices to have two antennas.
With PCIe SDR card, a single card is sufficient to test MIMO 2x2.
The two antennas connectors on N210 may lead to confusion: they are used to handle RX and TX in FDD mode (because frequencies are different) and only one antenna is used in TDD.
If you want to use cables with your two N210, as described in doc, you need a diplexer as FDD uses several frequencies.
You may need different diplexers depending on frequencies. But you can easily find them with large band support.For instance we use (Sorry, french site): www.mhzshop.com/shop/index~sid~eb73b8fe1f40f3ecc7a0bd97fb243ab9~cl~details~anid~62d49a2ccd7735fd4.96322717~listtype~search~searchparam~2226.htm
Where can we change parameters such as P-CSCF address ?
You can easily configure PCO (Protocol Configuration Options) with JSON configuration files.
This includes P-CSCF adresses as well as DNS, IP or operator dedicated options.
I want to setup QoS
You can setup as many PDN as you want and for every PDN as many dedicated bearer as you want.
Bearers QoS can be defined in JSON configuration files (QCI, priority, TFT, UM/AM...).
The bearer may be connected from network or from UE depending on the scenario.