Novel cost-effective redundant mobile fronthaul system using short-reach transceiver

Abstract

Local 5G system is widely used for industrial application, it is important to ensure redundancy to recover quickly in the event of failure for providing highly reliable services. On the other hand, the cost reduction of the mobile system becomes a problem in terms of having functions only for the cases of failure. We propose cost-effective redundant mobile fronthaul (MFH) system that uses only short-reach transceivers for the first time. Numerical simulations indicate that this system can provide 20-km redundant-line transmission with 8% redundancy by Reed-Solomon coding function.

Feasibility of rate-adjustment function in redundant mobile fronthaul system using short-reach transceiver

“…As the parity amount of RS encoding increased, the received power-budget amount also increased. To achieve the transmission-distance requirement of the MFH (20 km), the requirement of receiving power budget was 4 dB [5]. When RS(255, 233) coding was applied, the received power budget was 4.2 dB, which satisfied the requirement.…”

“…In this section, the circuit designs that enable our proposed system are described. The details of functional blocks in Physical Coding Sublayer (PCS) and Physical Medium Attachment (PMA) are described in previously proposed paper [5].…”

“…The FEC was selected by considering the numerical simulation results [5] and using it with a redundancy ratio of 8% or more. FEC RS(255, 223), RS(255, 229), RS(255, 233) and RS(OFF) mode were set.…”

“…To guarantee high reliability for single frequency band such as Local 5G, it is necessary to recover quickly when a transmissionline failure occurs [4]. We previously proposed a cost-effective redundant mobile fronthaul (MFH) system for local 5G systems [5]. In this system, a forward error correction (FEC) is added to the physical (PHY) layer on the central unit/distributed unit (CU/DU) for achieving transmission lengthening when a transmission-line failure occurs.…”