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Radio Units

Remote Radio Units — RRU / RRH

Mountable RF units placed on the tower at antenna height, connected to the baseband unit over CPRI or eCPRI optical fiber. Eliminate coaxial cable loss, reduce interference, and support multi-mode 2G/3G/4G operation from a single tower-mounted unit.

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Why RRU Architecture

Move the Radio to the Antenna

Traditional macro base stations placed the radio equipment in a ground-level cabinet and ran coaxial cable up the tower to the antenna — losing 3–8 dB on a 40m tower run. RRU architecture inverts this: the radio unit mounts at antenna height, connected to the baseband over a single optical fiber with negligible loss at any distance. The result is a 3–8 dB improvement in effective radiated power and receive sensitivity, directly translating to better coverage and higher data rates at cell edge.

Eliminate Cable Loss
A 40m coaxial run (1-5/8" cable) loses approximately 3–5 dB at 2.1 GHz. Moving the RRU to antenna height replaces this with optical fiber — sub-0.1 dB loss at any length up to 10 km. This single change boosts EIRP and receive sensitivity without any power increase.
Multi-Mode Operation
Modern RRUs support GSM, UMTS, and LTE simultaneously on the same hardware through software-defined radio (SDR) capability. A single tower-mounted unit handles all three generations — reducing tower loading and space compared to separate per-technology radios.
CPRI Daisy-Chaining
Multiple RRUs can be cascaded (daisy-chained) from a single BBU optical port. A typical deployment chains 2–4 RRUs covering different sectors or frequencies from one fiber connection, reducing the number of BBU interfaces required and simplifying the tower cabling design.
Wide Temperature Range
All carrier-grade RRUs operate across –40°C to +55°C without active cooling. Passive heat dissipation through the housing fins handles worst-case thermal load. IP65 or better rating protects against rain, ice, and dust in any installation environment.
–48V DC Power
Powered via dedicated –48V DC cabling run alongside the fiber. Power consumption ranges from 100–600W depending on MIMO configuration and output power. The RRU can be powered from the same site power plant as the BBU, simplifying system design.
Remote Management
CPRI carries an embedded OAM channel alongside the IQ data. RRU firmware upgrades, alarm monitoring, PA gain adjustments, and power control are all handled remotely over the existing fiber connection — no truck rolls required for routine maintenance.
Featured Products

Carrier-Grade RRU / RRH Units

Ericsson RRUS 4449

Ericsson — Low-Band Remote Radio Unit
Remote Radio Head on tower
BandsB5 (869–894 MHz) / B12 (729–746 MHz) / B71 (663–698 MHz)
MIMO4×4
InterfaceCPRI optical fiber
Weight~32 kg
Dimensions306 × 612 × 586 mm (with solar shield)
Operating Temp–40°C to +55°C
Wind Load260 N
StandardsLTE FDD, multi-standard
MountingRail / wall / pole

Huawei RRU3953

Huawei — Multi-Mode Remote Radio Unit
Multi-Mode RRU
ModesGSM / UMTS / LTE (multi-mode)
Freq Range800–2100 MHz (band-specific variants)
Variants900 MHz, 1800 MHz, 2100 MHz, 1900 MHz
MIMO Config2T2R, 2T4R, or 4T4R
Power Supply–48 V DC
InterfaceCPRI optical fiber
Operating Temp–40°C to +55°C
ProtectionIP65
MOBITELSMS Integration

RRU to Core — Complete Stack

The RRU is the RF front-end of a distributed base station architecture. MOBITELSMS's mobile core connects to the BBU that drives the RRU, completing the full 4G attach and data path.

CPRI Fiber to BBU
The RRU connects via CPRI (Common Public Radio Interface) optical fiber to the BBU in the ground cabinet. CPRI line rates range from 614.4 Mbps (Option 1) up to 9.83 Gbps (Option 7) for 4×4 MIMO LTE — a single SFP port handles multiple sectors when daisy-chained.
BBU → S1 → MOBITELSMS EPC
The BBU processes baseband (LTE L1/L2/L3) and connects via S1-AP (SCTP port 36412) to MOBITELSMS's Open5GS MME and S1-U (GTP-U UDP port 2152) to the SGW. Configure the BBU with MOBITELSMS's MME IP, PLMN, and TAC to complete the S1 setup.
UE Authentication
When a UE attaches through the RRU/BBU, MOBITELSMS's MME triggers an authentication request to the HSS over Diameter S6a. The HSS generates EPS-AKA vectors, and the full NAS security procedure completes before the UE is granted data connectivity.
CDR Generation
MOBITELSMS's SGW and PGW generate S-CDRs and P-CDRs for each UE data session through the RRU cell. These records feed into the CDR pipeline (multiple high-availability storage backends) for real-time billing, quota enforcement via PCRF, and compliance reporting.

Upgrade to RRU Architecture

Our engineers will design the optimal CPRI fiber plan, power cabling, and BBU configuration for your tower site. Get a site-specific proposal within 48 hours.

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