Akihiro Otaka

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In this paper, we experimentally and numerically evaluate the performance of a common public radio interface (CPRI) over a time division multiplexed passive optical network (TDM-PON) system for accommodating densely deployed small cells in centralized-radio-accessnetwork- based future radio access. A prototype of the CPRI over TDM-PON is developed by using(More)
The wavelength (λ)-tunable wavelength-division multiplexing/time-division multiplexing passive optical network (WDM/TDM-PON) can distribute traffic loads fairly by dynamically reallocating a certain number of optical network units (ONUs) from highly loaded optical subscriber units (OSUs) to lightly loaded OSUs. This reallocation can be executed by(More)
Network Function Virtualization (NFV) and Software Defined Network (SDN) are attracting attention with the goal being enhanced networks efficiency. To enhance flexibility and to meet user requests and conditions, software implementation of communications equipment is pursued as our approach. It becomes possible to implement various optical line terminal(More)
We experimentally evaluate the mobile fronthaul (MFH) optical bandwidth and wireless coordinated multipoint (CoMP) transmission and reception performance in Ethernet-based MFH with our proposed splitphysical (PHY) processing (SPP).To reduce theMFHoptical bandwidth, SPP redefines the base station (BS) functional split between the baseband unit (BBU) and the(More)
The relentless increase in network capacity is making it important to reduce power consumption. In optical access network systems, the buffer size in layer-2 switches, which aggregate multiple passive optical network systems, is expanding as the network speed increases, and the buffer is now significant in terms of power consumption. An effective way to(More)