かたわら

Etymology
The adverb is derived from sense 5 of the noun.

Adverb

 * 1) in addition, besides, while

Noun

 * 1) the side of something
 * 2) a person nearby
 * 3) the area nearby; vicinity
 * 4) a remote partially built-up area along a major highway
 * 5) in addition to…, while doing…, on the other hand…
 * 1) a remote partially built-up area along a major highway
 * 2) in addition to…, while doing…, on the other hand…

Usage notes
かたわら can be after a noun with の, or a verb in its. The verb after かたわら is an additional, less emphasised action or habit compared to the action before.