InterDigital, Inc. (InterDigital) undertakes the design and development of advanced cellular technologies for wireless IEEE 802 and digital cellular products. The company develops cellular technologies for time division multiple access (TDMA); code division multiple access (CDMA); orthogonal frequency-division multiple access (OFDMA); and multiple-input and multiple-output (MIMO) technologies. InterDigital also develops IEEE 802 standard wireless technologies and wireless local area network (WLAN), wireless metropolitan area networks (WMAN) and digital cellular technologies. These technologies include radio resource measurements (IEEE 802.11k), handover among radio access technologies (IEEE 802.21), wireless network management (IEEE 802.11v), mesh networks (IEEE 802.11s), wireless network security and broadband wireless (IEEE 802.16), which is WiMAX wireless technology. The company offers its services across the US, Korea, Canada, Taiwan, Japan, China and Germany, among others. InterDigital is headquartered in Pennsylvania, the US.