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...possible to guarantee a stationary position for the HAP during its service hours and so the cells will still be moving. Handoff is a common technique employed by all cellular systems both terrestrial =-=[16]-=- and satellite [12], which has been proven vital for both ensuring uninterrupted connections and increasing system capacity (using directed handoff): For this work we will focus on its first use: to m...

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...m. C. Channel Assignment Techniques for Handoff There are several handoff techniques proposed in the literature depending on the type of the channel allocation scheme used. These are mainly the fixed =-=[14]-=-, flexible [13] and dynamic [15] channel assignment strategies initially designed for terrestrial systems. These strategies are used for new call or handoff call requests. For the case of the handoff ...

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...tional antenna to create cells on the ground. These transceivers are co-located on the platform, and they offer line-of-sight communication to a geographic service area of approximately 60km diameter =-=[2]-=-. Due to the nature of the HAP architecture, it is possible to achieve cell overlap and thus maximise the system capacity whilst ensuring uniform and fair quality of service to all users [3][4][5]. De...

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...ssignment Techniques for Handoff There are several handoff techniques proposed in the literature depending on the type of the channel allocation scheme used. These are mainly the fixed [14], flexible =-=[13]-=- and dynamic [15] channel assignment strategies initially designed for terrestrial systems. These strategies are used for new call or handoff call requests. For the case of the handoff in a terrestria...

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...rference Ratio (CIR). This is determined from the link budget and is related to the power rolloff with angle from the antenna gain profile. Detailed information regarding cell overlap can be found in =-=[7]-=- and [8]. In this paper, we will only focus on the x-axis drift effect of the platform. This is because the techniques used to cope with the movements are likely to produce similar effects in all move...

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...ues for Handoff There are several handoff techniques proposed in the literature depending on the type of the channel allocation scheme used. These are mainly the fixed [14], flexible [13] and dynamic =-=[15]-=- channel assignment strategies initially designed for terrestrial systems. These strategies are used for new call or handoff call requests. For the case of the handoff in a terrestrial communication s...

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... Ratio (CIR). This is determined from the link budget and is related to the power rolloff with angle from the antenna gain profile. Detailed information regarding cell overlap can be found in [7] and =-=[8]-=-. In this paper, we will only focus on the x-axis drift effect of the platform. This is because the techniques used to cope with the movements are likely to produce similar effects in all movements. I...

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... diameter [2]. Due to the nature of the HAP architecture, it is possible to achieve cell overlap and thus maximise the system capacity whilst ensuring uniform and fair quality of service to all users =-=[3]-=-[4][5]. Despite the advantages that the HAP architecture has to offer for such communications, there are also several disadvantages that need to be investigated [2]. One of these disadvantages is the ...

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...ter [2]. Due to the nature of the HAP architecture, it is possible to achieve cell overlap and thus maximise the system capacity whilst ensuring uniform and fair quality of service to all users [3][4]=-=[5]-=-. Despite the advantages that the HAP architecture has to offer for such communications, there are also several disadvantages that need to be investigated [2]. One of these disadvantages is the relati...

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...ee a stationary position for the HAP during its service hours and so the cells will still be moving. Handoff is a common technique employed by all cellular systems both terrestrial [16] and satellite =-=[12]-=-, which has been proven vital for both ensuring uninterrupted connections and increasing system capacity (using directed handoff): For this work we will focus on its first use: to maintain uninterrupt...

Citation Context

...ameter [2]. Due to the nature of the HAP architecture, it is possible to achieve cell overlap and thus maximise the system capacity whilst ensuring uniform and fair quality of service to all users [3]=-=[4]-=-[5]. Despite the advantages that the HAP architecture has to offer for such communications, there are also several disadvantages that need to be investigated [2]. One of these disadvantages is the rel...

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...ce Communications Research Group, Department of Electronics, University of York, Heslington, York, YO10 5DD, United Kingdom e-mail: K.Katzis@ohm.york.ac.uk antenna steering mechanisms on the platform =-=[9]-=-[10] have several constraints associated with them. For example, they must be powered, and they add extra weight and cost to the payload. Furthermore, even if they are employed it is impossible to gua...

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...Communications Research Group, Department of Electronics, University of York, Heslington, York, YO10 5DD, United Kingdom e-mail: K.Katzis@ohm.york.ac.uk antenna steering mechanisms on the platform [9]=-=[10]-=- have several constraints associated with them. For example, they must be powered, and they add extra weight and cost to the payload. Furthermore, even if they are employed it is impossible to guarant...