As you may now minecraft pe command blocks have a signal limit but you can extend it with just this simple command copy this command and pate it in your chat and this will extend the signal all around your mcbedrock world

Command:

/tickingarea add circle ~ ~ ~ 1 One

Isn't it laggy?

You should add more information on what each of the arguments you provided does

as an example I will just do it for you but I heavily recommend that you edit your post.

Example:
/tickingarea add circle ~ ~ ~ 1 One

This command adds a ticking area (an area that is always loaded) that is circular with the diameter of 1 minecraft chunk. The ticking area's name will be "One".
The "One" is optional.

Another way to use this command and make it only have a certain area active is to do the following:
/tickingarea add x y z x1 y1 z1
The name is optional hence it is enclosed with 's
x y z is the first point and x1 y1 z1 is the second point and everything within those coordinates will remain loaded as if someone was inside that region.

The main use for this command is to keep area's with command blocks loaded so that when you are out of range of command blocks they are still active.