LimeNET CrowdCell is a fully fledged, open-access small cell network-in-a-box solution. Complete with an integrated LimeSDR card and a dedicated front-end board that covers nearly all LTE bands, this technology uses existing macro 4G networks as backhaul and can be utilised for any network as a service deployment. LimeNET CrowdCell can also provide extended coverage and/or increase capacity of an existing network or accelerate and cost-optimize new network infrastructure developments.
LimeNET CrowdCell uses a modular architecture that can be delivered in a variety of configurations that meets case-specific requirements. It consists of four main modules, each of which can be easily upgraded:
Module 1: Backhaul Unit
The Backhaul unit connects or backhauls the LimeNET CrowdCell to an existing macro network using either wired or wireless connectivity. It can be configured for any specific band requirement and is fully integrated in the product.
4G Backhaul Module Features
| Feature | Specification |
|---|---|
| Peak data rates | downlink: up to 150 Mbps uplink: up to 50 Mbps |
| FDD band support¹ | 1, 3, 7, 8, 20, 28 |
| TDD band support¹ | 38, 40, 41 |
| Bandwidth | up to 20 MHz |
| Other interfaces | UMTS/HSPA GSM/GPRS/EDGE IEEE 802.11 b/g/n RJ-45 10/100 Mbps |
| MIMO¹ | up to 2 x 2 |
¹ depends on specific backhaul module options
Module 2: General-purpose processor (GPP) Unit
The general-purpose processor (GPP) unit is used to run and manage software and applications on the LimeNET CrowdCell. Thus, each cell can have its own configuration that could be changed and upgraded seamlessly. Since LimeNET CrowdCell functionality is defined by software, this enables not only different voice/data services, but also act as a last-mile service server for traffic offload and management, video or data storage and other services that are well beyond the capabilities of existing solutions. The software and its distribution tools are supplied by our community of developers through our dedicated App store.
LimeNET CrowdCell GPP Module Features
| LimeNET CrowdCell GPP module features | |
|---|---|
| Feature | Specification |
| Processor¹ | Intel Core i7-8550u |
| Memory² | 32 GB (max 64 GB) |
| Storage² | 512 GB SSD |
| Video | Intel HD Graphics |
| Display ports | Mini Display Port 1.2 HDMI 2.0 |
| Audio | Integrated chipset |
| Connectivity | 1 x USB 3.1 Type-C x USB 3.1 x USB 3.0³ 1 x Gigabit Ethernet⁴ |
| Wireless connectivity | Wi-Fi, Bluetooth |
| Power | Input 100-240 VAC Output 19 VDC, up to 65 W |
| OS⁵ | Ubuntu (pre-installed) |
¹processor depends on specific GPP model
²values can be changed according to specific requirements
³two USB3.0 used by other modules
⁴Ethernet used for wired backhaul connectivity
⁵Ubuntu required for LimeNET app store support
Modules 3 & 4: Software Defined Radio (SDR) & Flexible Front End
The software defined radio (SDR) & flexible front end in LimeNET CrowdCell builds upon the ground-breaking LimeSDR software-defined radio technology to deliver an app-enabled path covering any standard from IoT to 5G. Use of Limes SDR platform provides the most flexible radio hardware solution that enables LimeNET CrowdCell to be setup in numerous varieties of small-cell configurations. Thus, it is an on-demand network solution, where services could easily shift to data, voice, IoT or any other Telco-centric services. LimeNET CrowdCell comes pre-equipped with a flexible front-end module that provides signal duplexing, filtering and amplification.
The CrowdCell is a 4G Relay technology, whereby an intermediate “Crowd” enabled device relays traffic between a customer UE and the macro network. Its main benefit is a rapid and low cost solution thanks to its Plug-and-Play (P&P) concept by using of the available 4G coverage.
LimeNET Mini SDR/RF Features*
| Feature | Specification |
|---|---|
| RF transceiver | LMS7002M |
| FPGA | Altera Cyclone IV |
| Memory | 256 MBytes DDR2 SDRAM |
| Connectivity | USB 3.0, Cypress controller |
| RF frequency range¹ | 10 MHz – 3.8 GHz |
| Bandwidth | up to 61.44 MHz |
| RF connectors | two SMA female jack |
| Power Output² | up to 23 dBm |
| Noise figure³ | 0.6 dB |
| LTE band support⁴ | FDD: 7; TDD: 38, 42, 48, 49 |
| MIMO | 2 x 2 |
¹ SDR programmable frequency range
² LTE modulated output
³ input stage only, optimized for 2.6 GHz
⁴ two FDD and one TDD band support with a single front end board. Band selection done via software. A wide front-end board configuration list. Products shipped to backers will also support the unlicensed CBRS band.
*Customers are reminded that any equipment that transmits wireless signals needs to comply with the relevant regulations for that region. This may require that the final equipment is submitted for testing and verification.
