Posted on December 13, 2016

What Does Uplink & Downlink Mean on a Cell Signal Booster?

James Nguyen

Estimated Reading Time: 4 minutes

WilsonPro Pro 70 PlusThis is a question we often get from enterprise customers.

Cellular devices such as smartphones and tablets operate within a certain radio frequency we know as 3G & 4G. When you’re experiencing dropped calls & slow internet, a cell phone signal booster basically acts as a reliable go-between your cell phone and the cell phone tower. Because of weak signal and the dreaded one bar of service disrupting your talk, text, internet and emails, a cell phone booster amplifies your 3G & 4G signal coming to and leaving your phone.

This boosted two-way communication is important and here’s why:

  • Signal coming in from the cell tower or base station to your cellular device is known as the downlink.
  • Signal leaving from your cellular device to the nearest cell tower or base station is known as the uplink.

In layman’s terms, downlink and uplink essentially mean download and upload.

Think about how many countless times you hear the person on the other line, but they can’t hear you or vice versa. That’s because of disrupted downlinks and uplinks. This is especially true with 3G as it is actually made of two frequency bands, 850 & 1900 Mhz, one for uplinking (talking) and the other for downlinking (listening).  

How Uplink & Downlink Power Affects Your Service

Cell phone signal strength is measured in decibels (dB). It operates within a signal level of -50 dB to -120 dB. This is true for all phones & cell devices, and for all carriers in North America.

-50 dB represents the best signal (full bars), while -120 dB represents poor signal (near dead zone).

Most cell phone reception problems begin when signal strength ranges from -90 to -100 dB. Within the range between -101 dB and -120 dB, it’s possible to have working signal, but service is severely affected.

Cell signal decibels are measured exponentially. Even something as “small” as +3 dB represents 2x the power! Conversely, -3 dB means half the power. This is the fragile nature of radio frequency, especially with cell phone signals.

DecibelsAmplified Power











Everyone’s cell coverage is unique because of factors such as carrier preference, cell tower distance, outside interference, building material, internal impediments, and user location. Therefore, anything and everything can affect the quality of incoming and outgoing signals.

How Enterprise Signal Boosters Improve Uplinks & Downlinks

WilsonPro AmplifiersFCC-approved commercial cell phone boosters are legally capped at +70 dB of max gain, which potentially adds a tremendous boost to signal strength & coverage. Although enterprise boosters are capable of boosting up to +70 dB, because of the factors listed above, real-world results generally range from a +3 dB to +42 dB gain for a majority of users, which is a minimum of at least 2x amplified 3G & 4G signal.

This enhanced signal leads to more powerful uplinks and downlinks, which leads to the two biggest benefits of owning a signal booster: faster internet data speeds & more coverage.

For example, let’s look at the two top-of-line WilsonPro cell signal boosters, the WilsonPro 4000R and the WilsonPro 70 Plus:

Wilson Pro 4000R uplink and downlink power output:


Wilson Pro 70 Plus uplink and downlink power output:


Both provide a maximum downlink signal boost up to 12.5x. However, the key difference is in the uplink power.

With an average difference of +3.24 dB, the Wilson Pro 4000R is 2.11x more powerful than the WilsonPro 70 Plus in the uplink power.

This translates to slightly more than twice the coverage. The WilsonPro 70 Plus provides coverage up to 50,000 sq ft. The WilsonPro 4000R provides coverage up to 100,000+ sq ft.

The same is also true to about our top two fleet & vehicle units, the Drive 4G-X and Drive 4G-M:

Drive 4G-X uplink and downlink power output:


Drive 4G-M uplink and downlink power output:


Both provide the same downlink output; however, the Drive 4G-X provides +3 dB across all five bands on uplink power.

This leads to up to 2x the reach to the nearest cell tower while on the road or out in the field, especially in remote, rural areas when signal and carrier service is limited.

When explaining to inquiring enterprise customers who need better technical understanding about the benefits of a cell signal booster, it’s always good practice to do the following:

  1. Explain cell phone signal strength in terms of dB.
  2. Talk about the 3 major components of a signal booster.
  3. And, of course, show the differences in models by uplink and downlink power output.

Download our Cell Phone Signal Booster Guide to learn more about wireless solutions for your most challenging connectivity issues. Or, check out our latest ProTip video below.