Cell Selection with Downlink Resource Partitioning in Heterogeneous Networks

Abstract

As the demand for wireless data grows to unprecedented levels, cellular service providers have been investigating different ways to meet this growing demand. The deployment of small cells with reduced transmission powers and reduced coverage areas is being considered as one potential solution. Using the same spectrum employed by existing macro cells, small cells allow increased spatial reuse of bandwidth, thus providing the potential for improved user rates. One challenge for small cells, though, is that due to their weaker signals (lower transmission powers, antennas with smaller antenna gains), the coverage area tends to be significantly reduced and the incremental benefit of deploying each small cell is limited. In this paper, resource partitioning is proposed along with suitably modified cell selection criteria to improve the performance of heterogeneous networks comprising small and macro cells that operate in the same swath of spectrum. Our simulation results demonstrate that with four small cells deployed per sector, 5%-ile and 50%-ile user throughputs both improve by ~150% relative to the same case without resource partitioning.

Decentralized adaptive range expansion in heterogeneous WCDMA networks

“…This can be achieved by means of biasing handover decisions between the different base stations (BS) such that user equipments (UE) are handed over to LPNs earlier than usual. Different versions of this solution, analysis and simulation results are given in [3], [4]. Typically, only relatively low bias values may be employed with limited gain, as large bias values would lead to low signal-to-interference-plus-noise ratio (SINR or Ec/Io in WCDMA terminology) and control channel performance would be severely impacted [4].…”

“…Different versions of this solution, analysis and simulation results are given in [3], [4]. Typically, only relatively low bias values may be employed with limited gain, as large bias values would lead to low signal-to-interference-plus-noise ratio (SINR or Ec/Io in WCDMA terminology) and control channel performance would be severely impacted [4]. One solution to this problem could be time-frequency resource partitioning [4], which is more suitable for synchronous OFDMA networks than for asynchronous WCDMA systems.…”

Downlink spectrum allocation in 5G HetNets

“…However, Heterogeneous Networks (HetNets) which consist of conventional macro cells overlaid by small cells are currently proposed as the most feasible method to improve spectrum utilization specially that spectral efficiency has reached its limit. DSAn and PRAn are implemented using rate adaptive and COMP schemes in [6], [7] to maximize the system throughput. Geometric programming is used in [6] to optimize users minimum rate under variable bandwidth and variable power.…”

“…Geometric programming is used in [6] to optimize users minimum rate under variable bandwidth and variable power. Resource partitioning is proposed in [7] to improve the performance of HetNets using a two cell selection criterion, one based on maximizing the received signal strength with a potential bias and the other based on maximizing the product of signal to interference plus noise ratio (SINR) and bias.…”

Interference Management in Heterogeneous Networks

“…In general, an MBS can be allocated frequencies exclusive from other low-power BSs [6,16,4,19] to completely eliminate the cross tier interference. However, as noted in [17] and by our results, partitioning frequencies is inefficient.…”