An unusually large number of companies and government officials will testify next week before the U.S. International Trade Commission on a patent dispute between wireless technology developer Qualcomm Inc. and semiconductor designer Broadcom Corp.

The hearing, which was extended from one to two days to accommodate the large number of interested parties, will consider what penalties to impose on Qualcomm for violating a Broadcom patent on technology that helps cell phones conserve battery power when out of cellular network range.