The majority of cellular phone calls take place inside, but cell networks are outside. 80% of business users inside complain of poor coverage or dropped calls. A building’s materials, while improving energy efficiency, will block or inhibit cellular service from the outside network. Building owners need a high-quality solution that can serve the middleprise and not take a year to deploy. Addressing cellular infrastructure for small to mid-size enterprise (middleprise – from 15,000 square feet to 500,000 square feet) has hit a major challenge in terms of who pays for the in-building system. Operators may be willing to subsidize enterprise solutions for large-scale customers that are larger than 500,000 square feet (usually in the form of a classic DAS), but the ROI for a middleprise customer installation is just not sufficient to justify the carrier’s cost, or to inspire the carrier to fast resolution.

HELIOS^® LTE Multi-Carriers RelayDAS™ is an Active DAS Hybrid based on HELIOS^® patented L2 Relay solution that solves the problem of poor cellular coverage in middleprise buildings. Compared to traditional Repeater, which typically lower network capacity due to repeater cannot distinguish desired signals from interference and noise, the L2 Relay enables SINR improvement, coverage extension and capacity enhancement by adaptive signal equalization, baseband decoding, encoding and signal regeneration. The PLMN is programmed to ensure the L2 Relay will only work on the specified PLMN and automatic lock the service cell. With built-in baseband modem, the L2 Relay will be able to scan all cells of telecom operator and decode MIB & SIB to obtain PLMN ID, MCC, MNC, PCI, Band, SNIR, RSRQ, RSRP/RSCP, Downlink BW, Uplink BW, Downlink Frequency, Uplink Frequency of Services Cell and all Neighbor Cells lists, even can accurate reverse link power control delivery to eNB from L2 Relay by learning the PRACH power that eNB expect to receive based on the signaling message from eNB without degrade macro network.

HELIOS^® LTE Multi-Carriers RelayDAS™ can support max four LTE carriers (operators) in three frequencies bands simultaneously, utilizing up to superb 115dB system gain with maximum 60dB dynamic automatic power level compensate algorithms delivers a stronger signal and provides a larger coverage footprint in environments where the incoming signal is weak. This ensures the strongest possible signal is sent to the inside antennas and self-configuring and self-optimizing whatever various types of coaxial cable used on site, even using low cost 75ohm CATV RG-6 coaxial cable. And embedded Power-Over-Cable (PoC) features enables HELIOS^® LTE Multi-Carriers RelayDAS™ can be installed in just days, and at a price point that meets the middleprise budget.

HELIOS^® LTE Multi-Carriers RelayDAS™ mainly consists of two parts as below:

• Network Unit (NU): The Network Unit is the master unit of the total HELIOS^® LTE Multi-Carriers RelayDAS™ system. The NU accepts Donor signals from the outside cellular network by Donor Antenna, and Signal source from the donor antenna is connected to the NU. Then it will be processed as adaptive signal-equalization, baseband-decoding, encoding and signal-regeneration and passes that service over coaxial cabling to CUs mounted where cellular service is needed. The NU scan all cells of telecom operator and decode MIB & SIB to obtain PLMN ID, MCC, MNC, PCI, Band, SNIR, RSRQ, RSRP/RSCP, Downlink BW, Uplink BW, Downlink Frequency, Uplink Frequency of Services Cell and all Neighbor Cells lists, it will only work on the specified PLMN and automatic lock the service cell, even can accurate reverse link power control delivery to eNB from NU by learning the PRACH power that eNB expect to receive based on the signaling message from eNB to ensure no degrade macro network. Embedded WEP management GUI centrally monitor, configure and manage the whole system.
• Coverage Units (CUs): it is the remote unit of the system that rebroadcasts the donor signals and will be directly connected to the coaxial cable, the CUs contain their own transmit amplifiers and are powered from the NU using Power over Cable (PoC). This allows for flexible placement of the CU’s since AC power at the site of each CU is not required. With four (4) Coverage Units, a combined in-building coverage range of up to 50,000 sq.ft. per system can be achieved, or expandable to eight CUs via Non-DC blocked power dividers. Up to 20dBm output power per band sent to antennas to provide a larger coverage footprint in environments.