Tag: Mid

06
Oct
2020
Posted in technology

T-Mobile boosts 5G speeds by combining mid band downloads, low band uploads

Delivering truly next-generation network speeds has been a challenge for U.S. cellular carriers, as their low, mid, and high band wireless towers have thus far required seriously awkward speed and distance compromises. Today, T-Mobile said it has successfully tested the next piece of its 5G strategy: Carrier Aggregation (CA) technology that will dedicate 2.5GHz mid band spectrum to downloads and 600MHz low band spectrum to uploads, simultaneously improving T-Mobile’s 5G speeds and reach across the United States.

In prior cellular generations, downloads and uploads generally shared a single radio frequency, equivalent to wired phone calls that put talking and listening through the same cable. Using carrier aggregation, T-Mobile is enabling a single phone to have separate inbound and outbound radio connections, spanning two radio frequencies that have been synchronized to seamlessly provide service together. This will let T-Mobile’s mid band towers handle outbound traffic at their best speed while slower but longer-reaching 600MHz low band towers take care of uploads, which don’t typically need to be as fast as downloads.

T-Mobile’s announcement has broader importance for businesses and end users, particularly in the United States, as it offers a clear path to widespread adoption of 5G cellular technology. Rival carriers Verizon and AT&T initially launched 5G exclusively using high band millimeter wave hardware that was extremely fast but barely covered individual city blocks, precluding large-scale rollouts. T-Mobile initially responded with a nationwide low band 600MHz 5G network that was roughly as slow as 4G in some places but faster in others. The carrier then augmented its service in some locations with a 2.5GHz mid band layer capable of much greater speeds. Combining those two layers in this fashion gives the carrier — and its rivals — a roadmap for effectively using existing “sub-6GHz” radio spectrum to deliver 5G service across

04
Oct
2020
Posted in computer

Computer heats up fast and slows down; is there a fix? – MacBook Pro 15″ Unibody Mid 2010

Dear IFIXIT,

I maintain my macbook pro(2010, 6,2, OS X10.95) with Disk Warrior and Drive Genius, clear the cookie cache regularly, using task manager in Chrome to lean out CPU load, use Memory Clean during heavy browser loads, and Apple’s Disk Utility to repair permissions. I have done all the “troubleshooting” tricks in the internet for speeding up performance to no avail. As the machine has gotten older it heats up faster and slows down more quickly.

Recently it started failing to boot, just shutting down. I let it sit for a couple of months while looking at options. Then on a whim I booted up on Disk Warrior, again, ran the director repair, and presto; was able to start up completely and run. No more problems like that since(1 month), but the heating up even under moderate work load is significant.

Is there a fix or a maintenance process to fix these issues? It’s a great machine and I feel like it still has a lot of service left in it..

Having watched a number of Louis Rossmann’s mac repair videos I kinda think that it might be a problem with some component on the logic board….

Thank you for your time and expertise.

RP

P.s. While the heating and performance issues have been building in recent years, one year ago, I did partition the drive(leaving headroom on each partition) so I could run software that required a later OS(10.13). After several months it seemed to create some difficulty returning to the OS x10.9 partition; slow starting. My solution was to move the 10.13 drive to an external bootable drive and to wipe that partition clean. It still exists; it’s just empty. This shouldn’t effect the main partition, but I thought it might be worth mentioning.

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