The Huawei UBBPe4 and UBBPe6 are both e-series Universal Baseband Processing boards for Huawei BBU chassis, and they share the same board format, CPRI-based RRU connection and mode support. The difference is capacity: in Huawei’s BBU technical specifications, the UBBPe6 supports twice the LTE FDD cells and twice the LTE throughput of the UBBPe4, along with more connected users and carrier-aggregation users. If a site needs more than six LTE cells per board, or high-traffic 4T4R sectors, the UBBPe6 is the board to choose; for smaller LTE or UMTS sites and like-for-like spares, the UBBPe4 is usually enough.
What UBBPe4 and UBBPe6 Have in Common
Both boards belong to the same UBBPe family (UBBPe1 to UBBPe6). They perform the same function inside the BBU: they process uplink and downlink baseband signals and provide CPRI ports that connect the BBU to RRUs and other RF modules. They plug into the baseband slots of a Huawei BBU and work together with a main control and transmission board such as a UMPT.
According to the Huawei BBU5900 hardware description, the UBBPe4 and UBBPe6 support the same radio modes:
- Single mode: UMTS, LTE FDD, LTE TDD and LTE NB-IoT
- Co-baseband multimode configurations such as UL (UMTS + LTE), LM, ULM, UM and TM, depending on software version
Huawei does not list UBBPe boards as GSM baseband boards. In co-MPT scenarios a UBBPe board can act as a GSM CPRI interface board, connecting RF modules that carry GSM, but GSM baseband processing is handled elsewhere in the configuration. If your site runs GSM, confirm the board plan with your software version before ordering.
UBBPe4 vs UBBPe6: Capacity Comparison
The table below summarises the capacity figures published in Huawei’s BBU Technical Specifications (V100R016C10) and the BBU5900 hardware description. Actual capacity depends on the software release, licences and the main control board in use.
| Item | UBBPe4 | UBBPe6 |
|---|---|---|
| Board family | UBBPe (e-series) | UBBPe (e-series) |
| Supported modes | UMTS, LTE FDD, LTE TDD, NB-IoT | UMTS, LTE FDD, LTE TDD, NB-IoT |
| LTE FDD cells, 2T2R (1.4–20 MHz) | 6 | 12 |
| LTE FDD cells, 4T4R (1.4–20 MHz) | 6 | 12 |
| LTE FDD cells, 8T8R (5–20 MHz) | 3 | Not listed |
| LTE TDD cells (5–20 MHz) | 6 x 2T2R or 4T4R | 12 x 2T2R or 4T4R, or 6 x 8T8R (10–20 MHz) |
| LTE throughput DL / UL | 1200 / 600 Mbit/s | 2400 / 1200 Mbit/s |
| LTE FDD RRC-connected UEs (5–20 MHz) | 3600 | 4800 |
| LTE FDD DRBs | 10800 | 14400 |
| LTE FDD signalling (BHCA) | 432000 | 648000 |
| CA UEs (2CC / 3CC / 4CC / 5CC) | 1200 / 800 / 600 / 480 | 1800 / 1200 / 900 / 720 |
| VoLTE UEs (with ROHC) | 1200 | 1600 |
| UMTS cells | 12 x 2R or 6 x 4R | 12 x 2R or 6 x 4R |
| UMTS CEs (UL / DL) | 1024 / 1024 | 1024 / 1024 |
| In-band NB-IoT | Up to 4 NB-IoT carriers per LTE FDD cell | Up to 4 NB-IoT carriers per LTE FDD cell |
LTE cells and throughput
The headline difference is LTE. A UBBPe4 handles up to six LTE FDD cells at 2T2R or 4T4R, which covers a typical three-sector site with two LTE carriers. A UBBPe6 handles up to twelve, so one board can carry a three-sector site with four LTE carriers, or a dense 4T4R layer that would otherwise need two UBBPe4 boards. Throughput follows the same pattern: 1200/600 Mbit/s on the UBBPe4 against 2400/1200 Mbit/s on the UBBPe6.
Users, signalling and carrier aggregation
The UBBPe6 also supports more RRC-connected users (4800 vs 3600 at 5–20 MHz), more data radio bearers, about 50% more busy-hour call attempts and 50% more carrier-aggregation users at each CC level. For urban sites with high user density, many VoLTE subscribers or heavy CA use, these limits often matter before the cell count does.
8T8R and TDD
For LTE FDD, Huawei’s table lists three 8T8R cells for the UBBPe4 and no 8T8R figure for the UBBPe6. For LTE TDD, the UBBPe6 supports six 8T8R cells at 10–20 MHz, while the UBBPe4 is listed only for 2T2R and 4T4R TDD cells. If you plan 8T8R sectors, check the exact specification for your mode and software release before choosing a board.
UMTS capacity
For UMTS, the two boards are listed with the same capacity: 12 cells with 2 receive antennas or 6 cells with 4 receive antennas, and 1024 uplink and 1024 downlink channel elements. If a board is used purely for UMTS, the UBBPe6 brings no extra 3G capacity over the UBBPe4.
Chassis and Main Control Board Compatibility
UBBPe boards are used in the BBU3910 and BBU5900, and Huawei also supports them in the BBU3900 depending on the software version. Slot assignment depends on the mode configuration and on the other boards in the chassis, and the main control board (UMPT) must run a software version that recognises the board. Our Huawei BBU5900 board compatibility guide covers slots, power and fan checks in more detail.
Which Board Should You Choose?
- Like-for-like replacement: replace a failed board with the same model. Mixing boards changes the capacity plan and may require configuration changes on the OSS.
- UMTS-only or small LTE sites: the UBBPe4 provides the same UMTS capacity as the UBBPe6 and enough LTE capacity for up to six cells.
- Multi-carrier LTE or high-traffic sites: the UBBPe6 doubles LTE cells and throughput and can replace two UBBPe4 boards in some designs, freeing a baseband slot.
- 5G NR: neither board is listed for NR. For NR, look at the g-series boards such as the UBBPg2 in a BBU5900.
What to Check When Buying a Used UBBPe4 or UBBPe6
- Board name and BOM code on the label: confirm the label reads UBBPe4 or UBBPe6 and that the BOM code and serial number are readable and match the panel.
- Connectors and panel: inspect the CPRI ports and backplane connector for bent pins, corrosion or damage.
- Software version: make sure your BBU and UMPT software support the board in the mode you plan to run.
- Licences: extra hardware capacity is only usable with the matching licences on the eNodeB or NodeB.
- Test record: ask whether the board was checked in a working BBU, with alarm status and CPRI links verified.
FAQ
Is the UBBPe6 a direct replacement for the UBBPe4?
Physically it uses the same board format and mode support, and its capacity is equal or higher in each category Huawei lists, except the 8T8R FDD configuration listed only for the UBBPe4. Confirm that your software version supports the UBBPe6 and update the configuration as needed.
Does the UBBPe4 or UBBPe6 support 5G NR?
No. Huawei lists the UBBPe boards for UMTS, LTE FDD, LTE TDD and NB-IoT. 5G NR baseband requires g-series boards such as UBBPg in a BBU5900.
Can I use UBBPe4 and UBBPe6 boards in the same BBU?
Yes, a BBU can hold different UBBP boards as long as slot rules, power budget and software support are respected. Capacity is planned per board, so each board’s limits apply separately.
Do UBBPe boards process GSM?
Huawei does not list UBBPe boards as GSM baseband boards. In co-MPT configurations a UBBPe can act as a GSM CPRI interface board for RF modules, so check your configuration if GSM is involved.
Buy Used Huawei UBBPe4 and UBBPe6 Boards
We supply used and refurbished UBBPe4 and UBBPe6 boards, along with BBU chassis, UMPT boards and RRUs, in our Huawei product range. Every unit is functionally tested before shipment, radio units such as RRUs are also VSWR tested, and all units carry a 90-day warranty. We ship worldwide in secure packaging. Contact us on WhatsApp at +86 187 3329 4669 / +86 139 3088 8705, email jack@telecombts.com, or use the form at https://telecombts.com/contact-us/ with the model and quantity you need.
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