Performance Study of the Dynamic Threshold-Based Soft-Handoff Algorithms in CDMA System

Kang Won LEE; Kwang Ho KOOK

Performance Study of the Dynamic Threshold-Based Soft-Handoff Algorithms in CDMA System

Kang Won LEE, Kwang Ho KOOK

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Traditional soft-handoff algorithms are based on the static threshold handoff algorithm recommended in the IS-95 standard. They are characterized by two parameters, an add threshold T_add and a drop threshold T_drop. These two parameters are assumed to have some constant values irrespective of the received signal strength of the pilot in the active set. To improve the performance of the soft-handoff, a dynamic threshold concept was proposed in previous work, where T_add and T_drop are dynamically determined according to the received signal strength of the pilot channel in the active set. In this study, previous work of the dynamic threshold algorithm is extended by including additional handoff criteria based on absolute signal strength and/or drop timer. Some functional forms with two new parameters, called boundary thresholds, and slope constant are proposed to dynamically determine T_add and T_drop. The dynamic threshold algorithms are compared with static ones in four different cases. Computer simulations show that the dynamic threshold algorithms outperform the static algorithms. We can see that the performance improvements differ from case to case. For example, when a pure dynamic threshold algorithm is compared with a pure static one (case 1), the decrease in the number of active set is about 13.7%. When the absolute threshold and the drop timer are also included in the handoff decision criteria (case 4), however, the decrease is only about 6.2%.

Publication: IEICE TRANSACTIONS on Communications Vol.E86-B No.1 pp.388-396

Publication Date: 2003/01/01

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Type of Manuscript: PAPER

Category: Wireless Communication Technology

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Kang Won LEE, Kwang Ho KOOK, "Performance Study of the Dynamic Threshold-Based Soft-Handoff Algorithms in CDMA System" in IEICE TRANSACTIONS on Communications, vol. E86-B, no. 1, pp. 388-396, January 2003, doi: .
Abstract: Traditional soft-handoff algorithms are based on the static threshold handoff algorithm recommended in the IS-95 standard. They are characterized by two parameters, an add threshold T_add and a drop threshold T_drop. These two parameters are assumed to have some constant values irrespective of the received signal strength of the pilot in the active set. To improve the performance of the soft-handoff, a dynamic threshold concept was proposed in previous work, where T_add and T_drop are dynamically determined according to the received signal strength of the pilot channel in the active set. In this study, previous work of the dynamic threshold algorithm is extended by including additional handoff criteria based on absolute signal strength and/or drop timer. Some functional forms with two new parameters, called boundary thresholds, and slope constant are proposed to dynamically determine T_add and T_drop. The dynamic threshold algorithms are compared with static ones in four different cases. Computer simulations show that the dynamic threshold algorithms outperform the static algorithms. We can see that the performance improvements differ from case to case. For example, when a pure dynamic threshold algorithm is compared with a pure static one (case 1), the decrease in the number of active set is about 13.7%. When the absolute threshold and the drop timer are also included in the handoff decision criteria (case 4), however, the decrease is only about 6.2%.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e86-b_1_388/_p

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@ARTICLE{e86-b_1_388,
author={Kang Won LEE, Kwang Ho KOOK, },
journal={IEICE TRANSACTIONS on Communications},
title={Performance Study of the Dynamic Threshold-Based Soft-Handoff Algorithms in CDMA System},
year={2003},
volume={E86-B},
number={1},
pages={388-396},
abstract={Traditional soft-handoff algorithms are based on the static threshold handoff algorithm recommended in the IS-95 standard. They are characterized by two parameters, an add threshold T_add and a drop threshold T_drop. These two parameters are assumed to have some constant values irrespective of the received signal strength of the pilot in the active set. To improve the performance of the soft-handoff, a dynamic threshold concept was proposed in previous work, where T_add and T_drop are dynamically determined according to the received signal strength of the pilot channel in the active set. In this study, previous work of the dynamic threshold algorithm is extended by including additional handoff criteria based on absolute signal strength and/or drop timer. Some functional forms with two new parameters, called boundary thresholds, and slope constant are proposed to dynamically determine T_add and T_drop. The dynamic threshold algorithms are compared with static ones in four different cases. Computer simulations show that the dynamic threshold algorithms outperform the static algorithms. We can see that the performance improvements differ from case to case. For example, when a pure dynamic threshold algorithm is compared with a pure static one (case 1), the decrease in the number of active set is about 13.7%. When the absolute threshold and the drop timer are also included in the handoff decision criteria (case 4), however, the decrease is only about 6.2%.},
keywords={},
doi={},
ISSN={},
month={January},}

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TY - JOUR
TI - Performance Study of the Dynamic Threshold-Based Soft-Handoff Algorithms in CDMA System
T2 - IEICE TRANSACTIONS on Communications
SP - 388
EP - 396
AU - Kang Won LEE
AU - Kwang Ho KOOK
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E86-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2003
AB - Traditional soft-handoff algorithms are based on the static threshold handoff algorithm recommended in the IS-95 standard. They are characterized by two parameters, an add threshold T_add and a drop threshold T_drop. These two parameters are assumed to have some constant values irrespective of the received signal strength of the pilot in the active set. To improve the performance of the soft-handoff, a dynamic threshold concept was proposed in previous work, where T_add and T_drop are dynamically determined according to the received signal strength of the pilot channel in the active set. In this study, previous work of the dynamic threshold algorithm is extended by including additional handoff criteria based on absolute signal strength and/or drop timer. Some functional forms with two new parameters, called boundary thresholds, and slope constant are proposed to dynamically determine T_add and T_drop. The dynamic threshold algorithms are compared with static ones in four different cases. Computer simulations show that the dynamic threshold algorithms outperform the static algorithms. We can see that the performance improvements differ from case to case. For example, when a pure dynamic threshold algorithm is compared with a pure static one (case 1), the decrease in the number of active set is about 13.7%. When the absolute threshold and the drop timer are also included in the handoff decision criteria (case 4), however, the decrease is only about 6.2%.
ER -