GSM Evolution Importance in Re-Farming 900 MHz Band

Vieira, Robson D.; Paiva, Rafael C. D.; Hulkkonen, Jari; Jarvela, R.; Iida, Renato F.; Säily, Mikko; Tavares, Filipe; Niemela, K.

doi:10.1109/vetecf.2010.5594534

Cited by 17 publications

(9 citation statements)

References 8 publications

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“…However, it doesn't need to release the remained spectrum only when the spectrum is vacant. A special case is that, when the total CDMA system load is 1 2 α * which is the maximum supportable load for a band, according to the conventional SR, all the system load should be served by one band, resulting in zero interference temperature. Since the OFDMA transmission will introduce cross-band interference as shown in part IV-B, although the other band is idle, it cannot be utilized by the OFDMA system.…”

Section: B Resultsmentioning

confidence: 99%

“…Conventionally, SR assembles the legacy services to partial licensed spectrum and frees up the remained spectrum for operating other systems, such as Orthogonal-Frequency Division Multiple Access (OFDMA) system [1]- [3]. With single-band legacy spectrum, the SR is feasible only when the legacy signal is narrowband, such as Global System for Mobile Communication (GSM) signal [4].…”

Section: Introductionmentioning

confidence: 99%

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Broadband Spectrum Refarming of CDMA Spectrum for OFDMA Cellular Systems

Han¹,

Liang²,

Soong³

2014

2015 IEEE Global Communications Conference (GLOBECOM)

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Conventional spectrum refarming (SR) techniques assemble the legacy services to partial licensed spectrum, and free up the remained spectrum for operating other systems. In this paper, we propose a new broadband SR framework in which the OFDMA system can concurrently share partial or all the CDMA spectrum that contains multiple bands. The interference temperature provided by the downlink isometric random precoded CDMA system is derived, and the in-band and cross-band interferences introduced by the OFDMA system to CDMA system are quantified. With the derived interference temperature and interference power, resource allocation problems of the OFDMA system under full-concurrent and partial-concurrent broadband SR are formulated and solved. Numerical results are provided to evaluate the SR performance, illustrate the advantage of the full-concurrent broadband SR, and show the significance of the CDMA system load planning on the SR performance.Index Terms-Broadband spectrum refarming (SR), CDMA, OFDMA, full-concurrent SR, partial-concurrent SR.

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Section: B Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Broadband Spectrum Refarming of CDMA Spectrum for OFDMA Cellular Systems

Han¹,

Liang²,

Soong³

2014

2015 IEEE Global Communications Conference (GLOBECOM)

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“…With this approach, it is possible to almost double the number of voice connections. The need for a network capacity increase in the GSM system is also driven by the refarming of spectrum, i.e., its assignment to other mobile communication systems like Long Term Evolution (LTE) [14].…”

Section: Introductionmentioning

confidence: 99%

Single Antenna Interference Cancellation for GSM/VAMOS/EDGE Using <inline-formula> <tex-math notation="TeX">$L_{p}$</tex-math></inline-formula>-Norm Detection and Decoding

Ruder

Lehmann

Schober

et al. 2015

IEEE Trans. Wireless Commun.

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Different schemes for single antenna interference cancellation (SAIC) in the Global System for Mobile Communications (GSM) have been proposed so far. Most of these schemes work best in synchronous interference environments and are limited to Gaussian minimum-shift keying (GMSK) modulation. In this paper, we propose several modifications of the conventional GSM receiver, which target the harmful effects of asynchronous co-channel interference (ACCI). Based on the observation that the impairment caused by ACCI cannot be modeled as additive Gaussian noise, which was assumed for the derivation of the metric used in state-of-the-art receivers, we propose to model the impairment as Generalized Gaussian noise (GGN). This leads to modifications of the conventional branch metrics of the reduced-state equalizer and the decoder employed at the receiver. Both proposed modifications are applicable to any linear modulation alphabet and do not require any modification of the GSM air interface. Hence, the proposed novel branch metrics are also applicable in Enhanced Data Rates for GSM Evolution (EDGE) systems which employ 8-ary phase-shift keying (8-PSK) modulation and where the SAIC algorithms tailored for GMSK cannot be used. Furthermore, we show that the proposed branch metric modifications also improve the performance of the new Voice Services over Adaptive Multi-user channels on One Slot (VAMOS) extension of GSM in ACCI environments. Based on simulation results, the performance of the proposed schemes is compared with that of an unmodified receiver employing the conventional Gaussian metric. We show that the proposed receivers outperform the unmodified receiver in ACCI environments and discuss the complexity entailed by the proposed branch metric modifications.

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“…This approach is known as spectrum refarming, and is a recommended deployment strategy of 3/4G technologies in networks with phasing-out GSM users. Re-farming of 900 MHz band into HSPA has started [1] and it is believed that it can be applied later to LTE. W-CDMA (UMTS) is already deployed in the 900 MHz band [2].…”

Section: Introductionmentioning

confidence: 99%

Novel Teletraffic Analysis of GSM/EDGE Orthogonal Sub Channel (OSC) and Application to Spectrum Re-farming

Alaa

Tawfik

2014

Frequenz

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GSM network operators are required to free up some of the spectrum allocated for voice traffic in order to serve 3G and 4G users. Re-farming 900 MHz and 1800 MHz bands into HSPA, W-CDMA (UMTS) and LTE is a challenge faced by operators with growing GSM voice traffic as 3G systems require 5 MHz bandwidth which is 25 times more bandwidth than a typical GSM channel. 4G systems (LTE) may even use 10 MHz to show superiority over the 5 MHz 3G systems. It is required to cope with the GSM voice traffic with significantly less bandwidth in order to accommodate 3/4G users. Orthogonal Sub Channel (OSC) is a novel technique offering efficient hardware utilization that can result in doubling GSM voice capacity. This is achieved by allowing two users to share the same physical radio resources. OSC can be used in phasing-out GSM networks to release significant frequency spectrum for 3/4G users. In this work, a thorough analysis on OSC performance gain is presented. The hard capacity gain offered by OSC is calculated as a function of the OSC penetration and compared with system level simulations. It is shown that hard capacity can be maintained with less number of TRXs (transceivers), and consequently, narrower spectrum. This paves the way for re-farming the released GSM spectrum into 3/4G traffic.

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GSM Evolution Importance in Re-Farming 900 MHz Band

Cited by 17 publications

References 8 publications

Broadband Spectrum Refarming of CDMA Spectrum for OFDMA Cellular Systems

Broadband Spectrum Refarming of CDMA Spectrum for OFDMA Cellular Systems

Single Antenna Interference Cancellation for GSM/VAMOS/EDGE Using <inline-formula> <tex-math notation="TeX">$L_{p}$</tex-math></inline-formula>-Norm Detection and Decoding

Novel Teletraffic Analysis of GSM/EDGE Orthogonal Sub Channel (OSC) and Application to Spectrum Re-farming

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