Kumu Networks Self Backhaul UE Relay User Manual
Kumu Self Backhaul UE Relay User Guide v1.1
Self Backhaul UE Relay
User Guide
Kumu Networks, 960 Hamlin Ct, Sunnyvale, CA 94089, www.kumunetworks.com
Kumu Self Backhaul UE Relay User Guide v1.1
Table of Contents
1 Overview ............................................................................................................................................... 4
2 Architecture & Theory of Operation ..................................................................................................... 4
2.1 System Fit ...................................................................................................................................... 4
2.2 Product Architecture ..................................................................................................................... 5
2.3 eNB Interoperability ...................................................................................................................... 7
2.3.1 Physical Connectivity to Small Cell ........................................................................................ 7
2.4 Connectivity to Core Network....................................................................................................... 7
2.5 Connectivity to Management ....................................................................................................... 8
2.5.1 Keep alive .............................................................................................................................. 8
2.5.2 Physical Ethernet Connectivity ............................................................................................. 9
2.6 UE Characteristics ......................................................................................................................... 9
2.6.1 Transmitter requirements ..................................................................................................... 9
2.6.2 SIM Card ................................................................................................................................ 9
2.6.3 SIM Card PIN (CPIN) .............................................................................................................. 9
2.6.4 APN Configuration................................................................................................................. 9
2.6.5 RF Channel Configuration ..................................................................................................... 9
2.6.6 Physical Cell ID (PCI) .............................................................................................................. 9
3 Electrical HW Architecture & Functionality ........................................................................................ 10
3.1 Access Front End ......................................................................................................................... 10
3.1.1 Unduplexer .......................................................................................................................... 10
3.1.2 Duplexer .............................................................................................................................. 10
3.1.3 Cancellation Module – Uplink ............................................................................................. 10
3.2 Relay Backhaul ............................................................................................................................ 10
3.2.1 UE ........................................................................................................................................ 10
3.2.2 Motherboard ....................................................................................................................... 10
3.2.3 Switch .................................................................................................................................. 10
3.2.4 Cancellation Module – Downlink ........................................................................................ 10
3.2.5 Backhaul Duplexer Module ................................................................................................. 10
4 Software Architecture & Functionality ............................................................................................... 10
Kumu Networks, 960 Hamlin Ct, Sunnyvale, CA 94089, www.kumunetworks.com
Kumu Self Backhaul UE Relay User Guide v1.1
5 Testing ................................................................................................................................................. 11
6 Electrical / Mechanical / Environmental ............................................................................................. 11
6.1 General Requirements ................................................................................................................ 11
6.2 Electrical Interfaces ..................................................................................................................... 12
6.2.1 Ethernet Interfaces ............................................................................................................. 12
6.2.2 Power Interface ................................................................................................................... 12
6.2.3 Access RF Interface (Antenna + eNB) .................................................................................. 12
6.2.4 Backhaul RF Interface (Antenna + UE) ................................................................................ 12
6.2.5 SIM Card .............................................................................................................................. 13
6.2.6 LEDs ..................................................................................................................................... 13
7 Regulatory Information ....................................................................................................................... 14
Kumu Networks, 960 Hamlin Ct, Sunnyvale, CA 94089, www.kumunetworks.com
Kumu Self Backhaul UE Relay User Guide v1.1
1 Overview
The document describes the product requirements for a Full Duplex UE Relay based on Kumu Networks’
cancellation module. The product is designed to be paired with an external eNB, and backhaul the eNB
data to the nearest macro base station using the same access frequencies used by the eNB (and the
macro network).
This document focuses on the system requirements rather than the cancellation requirements.
2 Architecture & Theory of Operation
2.1 System Fit
The Relay is an LTE self-backhaul product that uses the existing cellular bands to provide the backhaul
connection. This approach allows the use of the existing base stations without requiring additional
backhaul equipment at the site. Below is a diagram of a self-backhaul node. In this configuration the
Relay doesn’t look any different to the macrocell than a smartphone.
Figure 1 Relay network usage
Kumu Networks, 960 Hamlin Ct, Sunnyvale, CA 94089, www.kumunetworks.com
Kumu Self Backhaul UE Relay User Guide v1.1
2.2 Product Architecture
Conceptually an LTE self-backhaul Relay is an eNodeB with its Ethernet connection connected to a well
provisioned cellphone that talks to a base station. In the case of the Kumu Relay product the EnodeB is
external vendor equipment.
Figure 2 Relay data path block diagram
Additionally, the Kumu self-cancellation modules (indicated by the blocks UL and DL in the above figure)
allow the Relay to operate in full duplex approaching close to 2x the spectral efficiency of competitor’s
products. The self-cancellation is used to cancel the leakage of a given ports transmit signal into the
other ports receiver.
The CPU acts as a USB to Ethernet bridge as well as providing configuration, control and monitoring of
the unit. The EPC termination is provided by the EPC attached to the base station where the Ethernet
link from the attached eNode is encapsulated and forwarded via the internal UE air interface.
The control plane architecture is shown below where the physical layer connection is Ethernet for the
cancellation module UL and DL and external debug port and USB to the UE module inside the Relay.
Kumu Networks, 960 Hamlin Ct, Sunnyvale, CA 94089, www.kumunetworks.com
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