Low-Cost Multi-Mode Technology for Converged Cellular and Data Mobile Handsets
Multi-mode handsets are designed to work in conventional WLAN hotspots as well as in GSM cellular networks. Multi-mode communication is important to consumers for applications such as GSM/WLAN VoIP conference calling or GSM Voice/WLAN internet access. This paper introduces a transceiver architecture with significant cost, performance, and power consumption advantages for a GSM/WLAN multi-mode convergence device. Significant gains are achieved over other multi-mode implementations by coordinating the transmissions and receptions between the wireless standards. By scheduling radio resources in a prioritized round-robin manner, both standards have fair access to the radio channel while eliminating cross interference. This reduction in cross interference removes the need for expensive filter components and increases link reliability. Using this architecture, Quorum Systems has developed a GSM/WLAN system capable of simultaneous dual mode operation at very low cost.
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