Vertical handover policies for common radio resource management

Lincke, Susan

doi:10.1002/dac.715

Cited by 31 publications

(14 citation statements)

References 13 publications

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“…Similarly, Lincke discusses the CRRM problem from a more general perspective in e.g. [8] and references therein, comparing several substitution policies and evaluating them by means of simulations.…”

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confidence: 99%

A Novel Algorithm for Radio Access Technology, Selection in Heterogeneous B3G networks

Pérez‐Romero

Sallent

Agustí

2006

2006 IEEE 63rd Vehicular Technology Conference

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Abstract.-This paper proposes a new Radio Access Technology (RAT) selection algorithm which allows increasing the capacity of heterogeneous CDMA/TDMA systems. This is achieved by controlling the effective cell radius of the CDMA-based system (i.e. a network-controlled cell-breathing), so that the interference level in the CDMA-based RAT is reduced while at the same time the target coverage area is assured by means of the cooperation of the FDMA/TDMA based RATs.I In general, cellular wireless systems become interferencelimited and, consequently, any engineering technique devoted to either reduce interference or to improve the robustness of the system to bear interference will readily increase network capacity and operator's revenue. In this context, this paper intends to exploit the different sensitivity that diverse RATs may exhibit to interference so that a smart CRRM follows. In particular, in FDMA/TDMA-based access systems (e.g. GSM/GPRS) there is no intra-cell interference. In turn, intercell interference is caused by a single user in every co-channel cell. In contrast, in CDMA-based systems (e.g. UMTS) the intra-cell interference is caused by every single user transmitting in the cell. Furthermore, inter-cell interference is also originated by all simultaneous users in all neighbouring cells, since a complete frequency reuse is considered. Consequently, CDMA systems are much more sensitive to multi-user interference than FDMA/TDMA ones.The underlying idea of the CRRM approach developed in this paper is to take advantage of the coverage overlap that several RANs using different access technologies may provide in a certain service area in order to improve the overall interference pattern generated in the scenario for the CDMA-based systems and, consequently, to improve the capacity of the overall heterogeneous scenario. This can be achieved by controlling the effective cell radius of CDMA-based systems (i.e. a controlled cell-breathing effect) through appropriate initial RAT selection and vertical handover approaches. In this way, the interference level in CDMA-based RATs is reduced while at the same time the target coverage area is assured by means of the cooperation of the FDMA/TDMA-based RATs. The above concept, denoted here as Network-Controlled CellBreathing (NCCB) can be effectively complemented with load balancing considerations. That is, the control of the CDMA effective radius has also a straight impact on the way how the load is distributed among the RATs, i.e. if the CDMA radius is too small, a higher number of users will exist in the FDMA/TDMA while if the CDMA radius is too high, the opposite situation may occur, thus leading to load unbalance situations that may limit the flexibility of the CRRM approach. Then, the performance achieved with a NCCB strategy can be improved if load balancing principles are also applied into the 0-7803-

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confidence: 99%

A Novel Algorithm for Radio Access Technology, Selection in Heterogeneous B3G networks

Pérez‐Romero

Sallent

Agustí

2006

2006 IEEE 63rd Vehicular Technology Conference

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“…For example, it is projected that 2G/2.5G/3G triple-mode terminals will be available for most users in 2009-2010, with a penetration of up to 90% [18]. With the current development in 3GPP-LTE and WiMAX (IEEE 802.16e), quadmode terminals will likely be available in the nearest future.…”

Section: Motivation For Heterogeneous Mobile Terminalsmentioning

confidence: 99%

Effect of mobile terminal heterogeneity on call blocking/dropping probability in cooperative heterogeneous cellular networks

Falowo

Chan

2010

Telecommun Syst

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It is envisaged that next generation wireless networks (NGWN) will be heterogeneous, consisting of multiple radio access technologies (RATs) coexisting in the same geographical area. In these heterogeneous wireless networks, mobile terminals of different capabilities (heterogeneous terminals) will be used by subscribers to access network services. We investigate the effect of using heterogeneous mobile terminals (e.g. single-mode, dual-mode, triple-mode, etc.) on call blocking and call dropping probabilities in cooperative heterogeneous wireless networks. We develop analytical models for heterogeneous mobile terminals and joint radio resource management in heterogeneous wireless networks. Using a two-class three-RAT heterogeneous wireless network as an example, the effect of using heterogeneous terminals in the network is evaluated. Results show the overall call blocking/dropping probability experienced by subscribers in heterogeneous wireless networks depends on the capabilities of mobile terminals used by the subscribers. In the worst case scenario, when all subscribers use single-mode mobile terminals, each subscriber is confined to a single RAT and consequently, joint radio resource management in heterogeneous wireless network has no improvement on new call blocking and handoff call dropping probabilities. However, in the best case scenario, when all subscribers use three-mode terminals, new class-1 call blocking probability decreases from 0.37 (for 100% singlemode terminals) to 0.05, at the arrival rate of 6 calls per minute. New class-2 call blocking probability also decreases from 0.8 to 0.52. Similarly, handoff class-1 call dropping probability decreases from 0.14 to 0.003, and handoff class-2 call dropping probability decreases from 0.44 to 0.09.

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“…It is possible to take advantage of the presence of multi-mode terminals by performing a Vertical Handover (VHO) of multi-mode terminals between RATs in order to free the capacity required to accept new calls from single-mode terminals. Several strategies to perform this traffic rearrangement are discussed in [5] and references therein.…”

Section: Related Workmentioning

confidence: 99%

Common Radio Resource Management Algorithms for Multimedia Heterogeneous Wireless Networks

López-Benítez

Gozálvez

2011

IEEE Trans. on Mobile Comput.

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Abstract-Heterogeneous wireless systems are envisaged as the integration and joint cooperative management of diverse radio access networks and technologies through which network providers can satisfy the wide variety of user/service demands in a more efficient manner by exploiting their varying characteristics and properties. To achieve this objective, a key tool is common radio resource management techniques designed to jointly manage the radio resources from different radio access technologies. In this context, this work proposes and optimizes new common radio resource management techniques designed to efficiently distribute traffic among the available radio access technologies while providing adequate quality of service levels under heterogeneous traffic scenarios. The obtained results demonstrate the ability of the proposed solutions to provide high user/service satisfaction levels while adequately exploiting the overall system resources.Index Terms-Beyond 3G heterogeneous wireless systems; common radio resource management; quality of service provision.

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Vertical handover policies for common radio resource management

Cited by 31 publications

References 13 publications

A Novel Algorithm for Radio Access Technology, Selection in Heterogeneous B3G networks

A Novel Algorithm for Radio Access Technology, Selection in Heterogeneous B3G networks

Effect of mobile terminal heterogeneity on call blocking/dropping probability in cooperative heterogeneous cellular networks

Common Radio Resource Management Algorithms for Multimedia Heterogeneous Wireless Networks

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