The Polaris Networks Home eNodeB Gateway (HeNB-GW), also referred to as Femtocell Gateway (F-GW), is based on an innovative architecture that provides the control capabilities necessary to manage large clusters of femtocells. The primary function of this gateway is to enable simple, seamless, highly secure access to subscribers as they roam between trusted mobile networks and untrusted public networks. The HeNB-GW provides an aggregation or concentration functionality for a group of Femtocell Access Points (FAPs). This preserves the hierarchical architecture of the current generation of the Core Network as it does not expose a large number of eNodeB base stations to the Core Network elements.
The Polaris Home eNodeB Gateway is a standards based implementation based on the 3GPP TR 23.830 architecture. It supports both 3GPP Release 9 and Release 10 specifications.
The Home eNodeB Gateway provides:
The Polaris HeNB-GW offers a comprehensive set of control-plane aggregation functions. It supports the ability to register and route the S1-MME signaling traffic from a large cluster of FAPs where multiple user devices are registered. It enables the MME to view the cluster of femtocells as a single entity. The HeNB-GW provides Paging Optimization - a mechanism for filtering paging messages in order to avoid paging distribution to HeNB/CSG cells where the UE is not registered. It also provides the NAS Node Selection Function (NNSF) to support S1-Flex or multiple S1-MME connections towards the EPC from any one HeNB.
The HeNB-GW offers a user-plane concentration function along with the control-plane concentration function. This allows the S-GW to view the cluster of femtocells as a single entity. The HeNB Gateway may be used only for control-plane aggregation, with the femtocells connected directly to the S-GW. The user-plane aggregation functionality provides support for both GTP-u and PMIP traffic.
The HeNB-GW can be used with an external Security Gateway (Se-GW). Optionally, the HeNB-GW can also provide an integrated Security Gateway that authenticates each femtocell and terminates the encrypted IPsec data connection from the femtocell. The Se-GW implements a Denial of Service (DoS) shield to protect the EPC (S-GW and MME) by detecting and filtering out the attack traffic while maintaining the QoS of useful traffic.
The Home eNodeB gateway from Polaris helps to reduce traffic in the Core Network by offloading users from the cellular network. It supports Selected IP Traffic Offload (SIPTO) by implementing Local S-GW and PGW functionality within the HeNB-GW.