Chapter 2 Next Generation Access Networks
31
2.4 Summary
This chapter offered a revision of PON and WiMAX standards and their benefits in developing
current and future access networks. Progressively, to accelerate in terms of bandwidth
utilisation, reach and penetration and consequently welcome upcoming bandwidth-demanding
fixed and mobile online services at low cost, a number of research initiatives in access networks
were presented.
The reported optical solutions focused around three major research directions. Increasing the
speed and reach/split of the existing PON standards to distances of at least 100km, employing
higher number of wavelengths in PON infrastructures to allow significant increase in network
throughput and security and finally to ensure compatibility with next-generation access
networks.
From the wireless prospective, enhancements to the existing standards have also been defined to
support higher data rates and number of users as well as to exploit transmission diversity
through the application of MIMO antennas.
Significantly, the WiMAX potential to inter-operate with xPONs has been reported in the
direction of offering sufficient backhaul capacity for high-end wireless services, ensuring
network flexibility with efficient network administration and management. In particular, the
application of RoF techniques is promoted to deliver broadband WiMAX to remote radio BSs.
An architecture based on this principle defines the aim of this research programme and will be
presented extensively in the chapters to follow.
Chapter 2 Next Generation Access Networks
32
References
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