SINR-oriented flexible quantization bits for optical-wireless deep converged eCPRI

摘要

The split-PHY and Ethernet-based eCPRI is mostly advanced for reducing fronthaul line rate and leveraging Ethernet protocol. In this paper, a fundamental method is proposed to compress the eCPRI data by dynamically adjusting the quantization bits of IQ sample according to the corresponding wireless signal quality of user equipment. With the aid of this mechanism, the fronthaul traffic is correlated to the eventual end-user traffic instead of the air bandwidth, and hence the flexibility and the bandwidth efficiency of the interface can be further improved. To verify this proposal, a simulation model achieving the complete low-MAC layer and PHY layer processing for LTE uplink and strictly following the 3GPP specifications is built. The results indicate that for the typical mobile environment, the proposed scheme can statistically save ~20% interface bandwidth.