Multiplayer mobile communication systems

Abstract

We consider three approaches of deploying multilayer networks for the global system for mobile communications (GSM). The first one is frequency partitioning where a GSM allocated bandwidth is divided into subbands and each subband is allocated to each layer. The spectral efficiency of the frequency partitioning architecture is evaluated. For a typical link quality requirement (SIR ≥ 12dB over 90% of the service area), the minimum bandwidths required to operate a system with a good spectral efficiency are 15 and 9 MHz, for macrocells and picocells, respectively. The minimum bandwidth for a microcell is from 2.4 MHz to 8.4 MHz depending on cell layouts. The maximum spectral efficiency of macrocells, microcells and picocells are 0.88, 1489 and 7845 Erlangs/MHz/km², respectively.

Another approach of deploying multilayer cellular systems is to allocate the entire GSM bandwidth to the macrocellular network, and to use the digital enhanced cordless telecommunication (DECT) network in street microcells and in in-building picocells. This approach is suitable for operators with relatively limited spectrum for a GSM network, however the system requires dual-mode mobile terminals, namely GSM/DECT terminals. We propose some enhancements to a DECT system, such as a minicell with an adaptive handover strategy, and an adaptive DECT-like radio interface for wireless ATM. We also evaluate a DECT system providing outdoor as well as indoor radio coverage from indoor radio ports.

The last approach is a spectrum sharing system where all cellular layers utilise the same bandwidth. In this thesis we propose fixed spectrum sharing algorithm (ESSA) and dynamic spectrum sharing algorithm (DSSA). We analyse several case studies for a FSSA system with the macrocellular cluster size of 4/12. FSSA gives better spectrum efficiency than the frequency partitioning scheme for the macrocellular system with a reuse cluster size of greater than seven. When the reuse cluster size is less than seven, the frequency partitioning gives better spectrum efficiency. The spectrum efficiency for both schemes are the same when the reuse cluster size is seven. Dynamic spectrum sharing algorithm (DSSA) provides spectrum sharing for cellular systems with dynamic channel assignment. The performance of DSSA is analysed in terms of SIR performance.

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