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Continued ...

According to Wen Tong, a Nortel Fellow and holder of dozens of patents related to 3G networks, 802.16m and LTE will help address the key challenges for next generation wireless networks - the need to support multiple devices per user, or what Nortel labels 'hyperconnectivity'; and the need to use higher frequencies, which will require enhanced spectral efficiency as well as new base station formats to deliver ROI. Wen Tong told Infoweek that 802.16m will support twice the spectral efficiency of 16e, moving from current ratings of 1.2bph (bits per hertz), per second per sector, or 12Mbps in a 10MHz sector bandwidth, to 2.4bph per second per sector, or 24Mbps.

Other fundamental improvements will include enhancements in VoIP quality, mainly through multihop technology based on multiple battery- or AC-powered pico base stations filling gaps between the main stations with their backhaul. Multihopping capabilities will be integrated into .16m devices and will "unify the data rates across the nation without having to increase the grid", delivering consistent performance regardless of distance from the macro station. Today, 5MHz of spectrum can support 60-70 voice calls, but with multihop, the same band can support three times that capacity, significantly increasing the quality of VoIP to match the levels delivered by circuit switched voice.

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