Evaluation of Soft Handover Micro Diversity Gain on the UMTS System Capacity and QoS

Monserrat, José F.; Gómez-Barquero, David; Calabuig, Daniel; Rubio, Lorenzo; Cardona, Narcís

doi:10.1109/pimrc.2006.254256

Cited by 5 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 3-way SHO has a slight improvement(0.2dB) in comparison w Figure 8 illustrates the BER versus average SNR for no SHO, 2-way SHO, and 3-way SHO. From [13] the required BER for voice service is 10 -3 , to obtain this value, the required SNR without SHO is 24dB, while with 2-way SHO is 12.1dB, and with 3-way SHO is 7dB. It can be concluded that SHO decreases the average SNR by approximately 50% and 70% for 2-way SHO and 3-way SHO respectively when BER=10 -3 .…”

Section: Resultsmentioning

confidence: 92%

“…Substituting (13) into (6) and (11), the actual transmit power under imperfect power control situation with 2-way SHO and 3-way SHO respectively can be obtained as [12]:…”

Section: From Equation 3 (E B /I O ) 1 and (E B /I O ) 2 Can Be Founmentioning

confidence: 99%

“…Soft handoff provides gain against slow fading or shadowing which is either natural or man-made large structures which provoke the signal strength. The macro diversity gain appears because the received signal by the MS from BS1 and BS2 are not correlated [13]. Fade margin arises due to effects of shadow fading so the signal in the coverage area will drop below specific values.…”

Section: Macro Diversity Gainmentioning

confidence: 99%

“…The mobile can coherently combine the signals from the different BSs that are included in the active set since it sees them as additional multipath components. Normally Maximum Ratio Combining (MRC) technique is used, which provides additional macro diversity benefit [13].…”

Section: Micro Diversity Gainmentioning

confidence: 99%

See 3 more Smart Citations

Performance Evaluation of Soft Handover in WCDMA System

Fasola¹,

Mawjoud²

2011

(AREJ)

View full text Add to dashboard Cite

In this paper soft handover parameters in WCDMA system are investigated. They include the effect of imperfect power control on the downlink capacity and power assignment to the mobile station, the micro diversity gain which represents the gain in the downlink direction, and the macro diversity gain which represents the gain in the uplink direction. The results showed that the power control error increases the total power consumption by the mobile station which leads to decrease the capacity (number of users per cell). Soft handover decreases the fade margin which leads to improve the coverage area. During soft handover the mobile station needs lower signal to noise ratio compared with no soft handover to obtain the specific bit error rate.

show abstract

Section: Resultsmentioning

confidence: 92%

“…Substituting (13) into (6) and (11), the actual transmit power under imperfect power control situation with 2-way SHO and 3-way SHO respectively can be obtained as [12]:…”

Section: From Equation 3 (E B /I O ) 1 and (E B /I O ) 2 Can Be Founmentioning

confidence: 99%

Section: Macro Diversity Gainmentioning

confidence: 99%

Section: Micro Diversity Gainmentioning

confidence: 99%

See 2 more Smart Citations

Performance Evaluation of Soft Handover in WCDMA System

Fasola¹,

Mawjoud²

2011

(AREJ)

View full text Add to dashboard Cite

show abstract

“…Downlink soft handoff performance in WCDMA was studied in [8] and the results led to that 2-way soft handoff reduces the required dedicated transmission power up to 3dB, moreover, soft handoff gain has better value at soft handoff overhead equal to 30% . In [9] the impact of soft handoff on the UMTS system performance is investigated, and the results approved that in downlink, soft handoff improves not only the quality of service but also the overall system capacity.…”

Section: Introductionmentioning

confidence: 96%

Soft Handoff Parameters Evaluation in Downlink WCDMA System

Al-Douri¹,

Mawjoud²

2011

(AREJ)

View full text Add to dashboard Cite

Mobility is an essential feature of mobile wireless communication systems. Handoff is a feature that deals with the mobility of the user in order to provide seamless phone call when the user cross the cell borders to another one. WCDMA system is the third generation system, implements soft handoff (SHO) technique while hard handoff (HHO) which is used in GSM system. Soft handoff is a technique which allows the user equipment in the overlap region to link with two or more base stations. The effect of soft handoff on the downlink direction of WCDMA will be studied because the downlink is considered as the limiting parameter in CDMA systems. The effect of soft handoff on the most important parameters of the downlink in WCDMA is investigated using simulation. Other related parameters of WCDMA system optimization such as load factor, noise rise, and parameters related to the quality of service like bit error rate (BER) are investigated. The results reveal that a user in soft handoff consumes less power from its serving base station. This reduction in the power leads to reducing the total interference in the cell and hence improving the performance of WCDMA system by reducing the load factor (loading) and noise rise, and increasing the capacity and enhancing the quality of service. Furthermore , the results assure why 2-way soft handoff is commonly used in CDMA system.

show abstract