Super-cell from inner sectors of Active Antenna System (AAS) — Vertical sectorization

Abstract

Active Antenna System (AAS) is an advanced antenna technology that features the ability of advanced beamforming techniques to provide a great flexibility in cellular network deployment which enables improvements in network capacity and coverage. Conventionally, network dimensioning is done based on busy hour traffic leading to cost-intensive overdimensioning for most of the time via deploying additional macro and small cells. In AAS, however, varying traffic concentrations can be flexibly handled by dynamic cell densification, e.g. by splitting a sector into smaller "sub-sectors". Vertical sectorization is a well-known approach where a conventional sector is split vertically in to two, inner and outer sectors, resulting in 3x2 sectors per site for AAS-based tri-sectorized site. In this paper work, an alternative vertical sectorization deployment configuration is presented where the inner sectors build a so called super-cell resulting from transmitting the same cell information in all inner sectors. Investigation results show that the super-cell configuration can mitigate unwanted back and side lobe effects in close proximity of the site and, therefore, provides a significant gain for users in this coverage area.

Improved Interference-Free Channel Allocation in Coordinated Multiuser Multiantenna Open-Access Small Cells

“…The use of orthogonal signatures to distinguish among antennas utilizes the spatial domain to generate simultaneous orthogonal channels on the same physical channel, with proper antenna reconfiguration through parallel feedings into antenna devices using a suitable switching circuitry among feed-lines 4 . For instance, the antennas can be arranged to cover specific spaces (see, e.g., [26], [27]). This is particularly useful to meet growing traffic demand at a wireless site, wherein antenna elements may be installed to create sectors, which are distinguished by assigned signatures.…”

“…The unconditional statistics of s D,j, se for all possible cases of |B j | can be obtained by combining the results in (26) or (27) with (10) or (11). In particular, for the case of J ≤ L j − 1, using (10) into (26) and (27), the statistics of s D,j, se follow the same forms as given in (26) and (27) with |B j | therein is replaced by M N K (i.e., case when all available channels are found to be interference-free).…”

Performance Analysis of Vertical and Higher Order Sectorization in Urban Environment at 28 GHz

“…In super cell scheme, multiple cells from the same sites start to act as single cell, and hence it helps in mitigating the inter-cell interference coming from own site. In vertical sectorization, the coverage area of the inner sector is generally small, therefore the inner sectors of the vertical sectored site can be configured with super cell configuration [4]. Antenna downtilting is a promising and a commonly used technique for optimizing the coverage and quality of the network.…”