The AAS needs to have a sufficient number of radio chains to support the relatively large number of sub-arrays. The performance of the components in the antenna system ultimately determines the effectiveness of the radio site, while a poor antenna system can severely reduce the radio network performance.Today's complex antenna systems with multiple frequencies and multiple technologies on the same radio site, put great demands on the ability to create effective antenna system solutions.Ericsson Antenna System is an integral part of Ericsson Radio System and provides a full range of high-quality products in the following areas: passive antennas, active antennas, filters and combiners, tower mounted amplifiers, feeder system, and accessories. By changing the phases of the sub-array signals in a certain way, this gain can be achieved in any direction, as shown in section A of Figure 3. The size of the array gain, relative to the gain of one sub-array, depends on the number of sub-arrays – for example, two sub-arrays gives an array gain of 2 (i.e. Recent technology developments have made advanced antenna systems (AAS) a viable option for large scale deployments in existing 4G and future 5G mobile networks. End-user performance requirements continue to increase, putting high demands on the radio access network (RAN) to deliver increased coverage, capacity and end-user throughput. This scenario calls for an AAS with a large antenna area and the ability to support horizontal beamforming.

Maximizing the antenna area is important for improving the UL cell-edge data rates, especially for higher frequency bands employing TDD.

Furthermore, mitigating interference in terms of null forming for MU-MIMO is even more challenging, since more channels typically need to be characterized with high granularity and accuracy. The performance of the components in the antenna system ultimately determines the effectiveness of the radio site, while a poor antenna system can severely reduce the radio network performance.Today's complex antenna systems with multiple frequencies and multiple technologies on the same radio site, put great demands on the ability to create effective antenna system solutions.Ericsson Antenna System is an integral part of Ericsson Radio System and provides a full range of high-quality products in the following areas: passive antennas, active antennas, filters and combiners, tower mounted amplifiers, feeder system, and accessories. Since the AAS and the transport network must be dimensioned for the maximum number of layers, the MNO needs to consider how many layers are required in their networks. Since data usage is currently increasing at a much faster rate than corresponding revenue, mobile network operators (MNOs) must evolve the RAN in a way that enables a reduced cost per bit while meeting new demands for end-user performance. The total antenna gain is the product of the array gain and the sub-array gain, as shown in section C of Figure 3. Together with the high site density, this leads to a situation where the signals from interfering base stations are strong, and severe interference problems may occur. This is particularly important when introducing 5G on existing site grids.An advanced antenna system (AAS) is a combination of an AAS radio and a set of AAS features. High AAS performance can be achieved without the need for many MIMO layers. Vertical beamforming, however, does not provide any significant gains as the vertical user spread is low. Knowledge of the radio channels between the antennas of the user and those of the base station is a key enabler for beamforming and MIMO, both for UL reception and DL transmission. MIMO works in both UL and DL, but for simplicity the description below will be based on the DL. Channel estimates can be used to determine how to combine the signals received to improve the desired signal power and mitigate interfering signals, either from other cells or within the same cell in the case of MU-MIMO.

Ericsson Radio System enables smooth, fast and cost-effective migration from 4G to 5G, allowing operators to launch the new technology and grow 5G coverage fast, no matter the scale and complexity.
The urban low-rise scenario illustrated in section B of Figure 4 represents many of the larger cities around the world, including the outskirts of many high-rise cities. It comprises hardware, software and services for radio, RAN Compute, transport, power, enclosure, antenna and site solutions– all run by a common management system. Applying AAS features to an AAS radio results in significant performance gains because of the higher degrees of freedom provided by the larger number of radio chains, also referred to as Massive MIMO.

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