For Ericsson markets t-mobile uses what is known as AIR antenna units which have the radio unit integrated with the antenna. This type of setup significantly reduces signal loss from the radio to the antenna since they're both practically next to each other and not sepearated by coax jumper cables like that of a remote radio unit.
Basic Ericsson AIR21 setup
(Note typically there are 2 Ericsson AIR per sector)
Ericsson AIR21 + Band 12 700 mhz Equipment
Note the addition of a new low band 700 mhz capable antenna + Ericsson RRUS11 B12 (remote radio units) in addition to new TMA (tower mounted amplifiers) connected to the AIR antenna. The new Ericsson RRUS11 B12 + Antenna addition is for tmobiles band 12 700mhz (L700) deployment.
Credit for the photographs belong to whoever took it. You know who you are!
This is the Samsung Outdoor Pico eNB small cell for LTE 1900 that will be deployed by Sprint. Outdoor small cells are utilized to providie additional capacity and coverage mainly in areas where there is a high population density such as major malls, major streets with lot of busineses, train stations, airports, and the like.
Small cells are mostly PnP where you just plug everything in and fire it up and it will auto configure itself by downloading parameters and additional information from the network. Utilizing the latest advances in small cell technology, these pico cells would also over time optimize itself based on feedback from UE and neighboring small cells and macro cells.
I need some technical terms so I can raise an issue with the Essential Phone team. It is well noted that the essential has reception problems but today, when I roamed on to US Cellular, it completely abandoned 1x and connected to LTE only. Which is fine when connected to Sprint because the phone can pass text messages over LTE. Howevever, while roaming, the phone would not send or receive text messages and could not make or receive calls because it was latched to USCC LTE. My 5X, when it would stay connected to USCC LTE, would somehow get notification of a text or call and idle back over to 1x to take care of things. Same deal when I would try to send a text as well. Seems the essential is dead in the water under these conditions.
What may be happening here? Anything I could mention to essential about how sprint handles this so maybe they could pin the problem down?