“Can you hear me now?” As much marketing hype as 3G wireless networks have received, the fact remains that customers of all the major wireless providers are frequently frustrated with their service’s poor voice quality and dropped calls. With 4G looming on the horizon, can we look forward to better voice quality?
To answer that question, it helps to first understand the flaws or inadequacies of 3G that cause the dropped calls, latency, and line-noise issues.
“The larger the footprint from a given site (achieved by increasing the transmit power or the height of the antennas), the more interference this site will cause to an adjacent site,” says Paul Carter, president of wireless research company Global Wireless Solutions. Cell signals can also be impeded by topography such as buildings, trees, and hills within the cell zone servicing either party on a call.
4G networks like WiMax or LTE use superior MIMO (multiple-input, multiple-output) antenna technologies that help alleviate some of these issues. MIMO won’t improve the sound quality of voice calls by itself, but using multiple antennas improves signal quality and ensures a more consistent and reliable connection.
More important, 4G technology can connect far more calls and data connections than 3G can, using the same amount of wireless spectrum. So the available bandwidth pipeline in 4G networks is significantly larger for individual users and devices.
4G networks should improve voice quality to some degree even if the carrier puts most of its network resources behind data service. For example, if the high bandwidth demands of broadband data are allocated to the emerging 4G network, the 3G network is freed up to support voice. The increased capacity will lead to clearer, more stable voice calls that don’t have to compete with data service for bandwidth.
The higher bandwidth and network capacity of 4G networks may also increase adoption of HD voice. HD voice calls sound as if the two parties on the call were sitting in a room next to each other having a conversation, rather than battling to talk over each other and missing half of the conversation due to overlap and latency. The increase in clarity and the decrease in line noise and call drops has led Skype users to talk almost 50 percent longer than callers using traditional voice networks, according to Skype CTO Jonathan Rosenberg.
With streaming audio and video, and even videoconferencing coming to mobile devices, the demand for data bandwidth will likely continue to grow exponentially. This demand for data capacity is forcing providers to expand their network infrastructure, and voice quality may improve as an unintended fringe benefit.
