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bigsnake49

Wild speculation about Dish

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On 12/6/2017 at 4:16 AM, Trip said:

If 700 isn't low-band, then other than 600 (which they also hold), what is?  FM?  Shortwave?  Except for 600, there's nothing lower than 700 even licensed to cell companies.

In mobile, low/mid/high band is defined by uplink, not downlink.  Lower 700 MHz D/E block band 29 has no uplink.

AJ

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On 12/6/2017 at 10:13 AM, bigsnake49 said:

It could be used for uplink with a midband downlink.

No.  Lower 700 MHz D/E block unpaired spectrum cannot not be used as uplink, only as supplemental downlink.  Look at the band plan.  You cannot shove uplink spectrum in the duplex gap between uplink and downlink.

AJ

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5 hours ago, bigsnake49 said:

I have also advocated using Band D&E as uplink.

Again, for technical reasons, that uplink is not going to happen.  The Lower 700 MHz D/E blocks were licensed as unpaired broadcast spectrum -- first UHF TV, later mobile broadcaset -- and that basically is how they shall remain.

AJ

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20 hours ago, lilotimz said:

Separation required for sub 1 ghz frequencies is troublesome. It's why low band inter and intraband CA has not been implemented and 4x4 MIMO on sub 1ghz frequencies at UE level is almost impossible.  

Heck it's almost impossible at the site level. 

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6 minutes ago, bigsnake49 said:

Heck it's almost impossible at the site level. 

Not exactly impossible.  Verizon and T-Mobile both have widespread lowband 4x2 MIMO deployments in the Seattle area....

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25 minutes ago, RAvirani said:

Not exactly impossible.  Verizon and T-Mobile both have widespread lowband 4x2 MIMO deployments in the Seattle area....

Lots of compromises to achieve it. Are you sure that those are 4x2 low frequency antennas and not mid frequency? 

Edited by bigsnake49

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1 hour ago, bigsnake49 said:

Lots of compromises to achieve it. Are you sure that those are 4x2 low frequency antennas and not mid frequency? 

Yes 4x2 is live on both low and mid bands for both providers.

We’re seeing mostly 4x2 MIMO on T-Mobile’s 600 MHz towers that are coming up as well. 

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Yes 4x2 is live on both low and mid bands for both providers.
We’re seeing mostly 4x2 MIMO on T-Mobile’s 600 MHz towers that are coming up as well. 
All 600 MHz equipment are 4x4 radios (4x2 at UE level).

Att and Verizon and in some siteareas Tmobile they're retrofitting sites to 4x4 eNB setups on 700 and 800mhz by using two lowband antennas + two sub 1ghz radios.



Sent from my Pixel using Tapatalk

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13 minutes ago, lilotimz said:

All 600 MHz equipment are 4x4 radios (4x2 at UE level).

Att and Verizon and in some siteareas Tmobile they're retrofitting sites to 4x4 eNB setups on 700 and 800mhz by using two lowband antennas + two sub 1ghz radios.



Sent from my Pixel using Tapatalk
 

I wonder how they're getting around the isolation/correlation problem at the low bands. Antenna design has totally changed since I took the class :).

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