The following covers three frequency solutions.
Solution 1: 1x3x3
Features: assuming there are 3 avilable frequencies F1/F2/F3, for the 3 sectors of a site, each sector configures one of the 3 frequencies. In 1x3x3 mode, there is little interference, high sector throughput and edge user throughput, but low spectrum efficiency.
Applicable scenarios: rich spectrum resources, discontinuous frequencies, low capacity requirements and high service rate requirements at the cell edge.
Solution 2: 1x3x1 (recommended)
Feature: assuming there is only 1 available frequency F1, for the 3 sectors of a site, each sector configures the same frequency. In the 1x3x1 mode, there is severe interference. If bandwidth per sector is the same, sector throughput and edge user throughput are smaller than the 1x3x3 solution. If total bandwidth is the same, sector throughput, edge user throughput, and spectrum efficiency are greater than the 1x3x3 solution.
Applicable scenario: scarce spectrum resources, high cell throughput requirements, low throughput requirements at the cell edge.
Solution 3: SFR (Soft Frequency Reuse) 1x3x1
Feature: based on the 1x3x1 solution, the SFR 1x3x1 solution further supports inter-cell interference coordination (ICIC). The solution compromises sector throughput for higher edge user throughput. It features low sector throughput, high edge user throughput, and high spectrum efficiency.
Applicable scenario: scarce spectrum resources, high-quality service experiences required by edge users.
Solution 2 (1x3x1) is recommended for two reasons:
1. TDD LTE supports intra-frequency networking. Adopting inter-frequency networking wastes resources. Therefore, solution 1 is not recommended.
2. intra-frequency networks can meet the service requirements of most projects, and the effect of ICIC on live networks is limited. Therefore, solution 2 is recommended for common projects.
