Outdoor OpenRAN

The need to provide both coverage and capacity while supporting growing data consumption, all with declining ARPUs, have placed tremendous pressure on MNOs to find the most efficient use of their allocated radio spectrum.

Our outdoor OpenRAN solution helps with spectrum optimization to make mobile operators profitable. The architecture consists of an OpenRAN Controller orchestrating:

Virtualized Baseband Unit (vBBU): Based on Intel-based COTS (x86) hardware, this component provides CU and DU functionality. It communicates to a cluster of RRHs (which contain RF and lower PHY) and supports multiple carriers based on the RRH cluster’s load. The interface between vBBU and RRH is based on Ethernet-based eCPRI. This architecture supports 4G today and is software-upgradable to 5G.

Remote radio heads (RRH): The Parallel Wireless solution incorporates standard, off-the-shelf RRHs and small cells from different OEMs. These OpenRAN RRHs and small cells can be integrated into our solution with minimum integration effort, reducing the overall cost of ownership for mobile operators.

Parallel Wireless has developed extensive OpenRAN partnerships for macros, small cells and Massive MIMOs to support all use cases for coverage and capacity.


5G networks will push the limits for small cell deployments. The Parallel Wireless OpenRAN approach solves the triple challenge of interference, mobility and deployment:

  • A combination of intra- and inter-frequency underlay and overlay cells will be a common practice in 5G networks. In a spatial densification deployment, the OpenRAN Controller manages intra-cell interferences, and for a vertical densification deployment it will coordinate all load-related handoffs and other functionalities to utilize different layers accordingly, thus improving overall system performance and frequency utilization.
  • The split concept (DU and CU) for 5G facilitates a simpler approach toward frequency coordination among different cells in a geographical area. This approach to small cell deployments enables different DUs with the same or different operating frequencies to be connected and coordinated through a single CU (Parallel Wireless vCU as a VNF in OpenRAN software suite).
  • All these interference mitigation techniques require tight coordination among different RRHs. Parallel Wireless SON coordinates with connected small cells directly, and also provides all required signaling to macro cells and reduces the overall system control signaling.
  • Besides interference issues, the densification of cellular networks can impact user experience due to increases in handoffs and related signaling loads. The increase of handoffs in a mobile system can directly impact the volume of signaling in the system and have a negative impact on overall user experience and system capacity. The Parallel Wireless OpenRAN controller dynamically executes parameter changes to optimize the user experience based on their mobility.