• Title/Summary/Keyword: HSDPA (High Speed Downlink Packet Access)

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An Unbiased Signal-to-Interference Ratio Estimator for the High Speed Downlink Packet Access System

  • Won, Seok-Ho;Kim, Whan-Woo;Ahn, Jae-Min;Lyu, Deuk-Su
    • ETRI Journal
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    • v.25 no.5
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    • pp.418-421
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    • 2003
  • We propose an unbiased signal-to-interference ratio (SIR) estimator for the high speed downlink packet access (HSDPA) system. The proposed SIR estimator solves the problem of underestimation present in conventional SIR estimators and is suitable for channel quality measurement in the adaptive modulation and coding scheme of HSDPA, which requires accurate SIR estimation for optimum adaptive modulation and coding selection. Our analysis and simulation results demonstrate the improved estimation performance of the proposed SIR estimator.

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BER performance analysis of successive interference cancellation(SIC) algorithm for W-CDMA HSDPA receiver (W-CDMA HSDPA수신기의 직렬간섭제거 알고리즘의 오류율 성능해석)

  • Koo Je-Gil
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.1
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    • pp.13-22
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    • 2004
  • This paper drives the exact expression of bit error rate(BER) performance for successive interference cancellation(SIC) algorithm against multipath interference components in a high-speed downlink packet access(HSDPA) system of W-CDMA downlink and the BER performance is evaluated by numerical analysis. Numerical results showed that the average BER performance is rapidly saturated in terms of increasing the number of multipath and is revealed significant improvement for improvement Processing gain(PG). For example, the average BER Performance of the SIC algorithm is superior to the performance of conventional scheme by more than 7dB and 1.4dB for processing gain PG=54 and 128 under the two-path channel and average BER=$1.0{\times}10^{-3}$, respectively. This results also indicated that the average BER saturation is occurred at nearly one weight factor which is assigned to pilot and data channels. Likewise, the average BER performance is greatly degraded due to increasing the interference power in proportional to the number of multipath with increasing multicode K. And the smaller multipath fading channel gain is arrived later, the more the average BER performance is improved. The results of performance analysis in this paper indicated that the multipath interference cancellation is required to improve the BER performance in a HSDPA system under multicode for high-speed packet transmission, low spreading factor, and multipath fading channel.

Service Quality Criteria for Voice Services over a HSDPA System (HSDPA 시스템을 통한 음성 서비스의 측정 기반 품질 기준 수립)

  • Kim, Beom-Joon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.7 no.2
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    • pp.249-255
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    • 2012
  • This paper covers the service quality of packet-based voice service that is provided over a high speed downlink packet access (HSDPA) system. Using the measurement software that has been developed in the course of preparing a advanced service quality management scheme for the packet-based voice service over a wireless network[2][3], a huge scale of experiment is conducted to measure the real quality of the voice service. Based on our analysis of the measurement result, the service quality of the voice service is supposed to be quite good over HSDPA system. In addition, another experiment to investigate the effect of degradation of wireless transmission conditions on the service quality of the voice service shows the values of wireless service metrics in which mean opinion score (MOS) starts to decrease.

Capacity Evaluation of VoIP Service over HSDPA with Frame-Bundling (HSDPA 시스템에서 Frame-Bundling을 채용한 VoIP 서비스 용량 평가)

  • Hwang, Jong-Yoon;Kim, Yong-Seok;Whang, Keum-Chan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.3B
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    • pp.161-167
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    • 2007
  • In this paper, we evaluate the capacity of voice over internet protocol (VoIP) services over high-speed downlink packet access (HSDPA), in which frame-bundling (FB) is incorporated to reduce the effect of relatively large headers in the IP/UDP/RTP layers. Also, a modified proportional pair (PF) packet scheduler design supporting for VoIP service is provided. The main focus of this work is the effect of FB on system outage based on delay budget in radio access networks. Simulation results show that VoIP system performance with FB scheme is highly sensitive to delay budget. We also conclude that HSDPA is attractive for transmission of VoIP if compared to the circuit switched (CS) voice that is used in WCDMA (Release'99).

Transmission of channel quality indicator (CQI) for efficient scheduling of TD-HSDPA systems (TD-HSDPA에서 효율적인 스케줄링을 위한 채널품질정보 (CQI) 전송)

  • Yeo, Woon-Young;Lee, Sang-Yun
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.269-270
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    • 2008
  • TD-SCDMA combines TDMA and CDMA components to provide more efficient use of radio resources, and includes a new feature called HSDPA (high-speed downlink packet access) in the R5 stage. The TD-HSDPA supports high-speed traffic with a shared channel, but the adopted mechanism causes feedback problem for scheduling. In this paper, we propose an improved mechanism that transmits channel quality indicator (CQI) more frequently, so that the TD-HSDPA scheduler can utilize all possible information about the downlink channel status.

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Quality Measurement and Analysis of Packet-based Voice Service over WiBro and HSDPA Systems (와이브로와 HSDPA 시스템에서의 패킷 기반 음성 서비스의 품질 측정 및 분석)

  • Kim, Chin-Chol;Kim, Beom-Joon
    • The KIPS Transactions:PartC
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    • v.19C no.2
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    • pp.119-126
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    • 2012
  • This paper covers the service quality of packet-based voice service that is provided over wireless broadband (WiBro) and high speed downlink packet access (HSDPA) systems. Using a measurement software that has been developed in the course of preparing a advanced service quality management scheme for the packet-based voice service over wireless networks, a huge scale of experiment is conducted to measure the real quality of the voice service. Based on our analysis of the measurement results, the service quality of the voice service is supposed to be quite good over both wireless systems. In addition, another experiment to investigate the effect of degradation of wireless transmission conditions on the service quality of the voice service shows the values of wireless service metrics in which mean opinion score (MOS) starts to decrease.

An N-Channel Stop and Wait ARQ based on Selective Packet Delay Strategy in HSDPA Systems (HSDPA 시스템에서 선택적 지연 기반의 N-채널 SAW ARQ)

  • Park Hyung-Ju;Lim Jae-sung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.10A
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    • pp.896-905
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    • 2005
  • In this paper, we propose a SPD(Selective Packet Delay) scheme to improve the performance of High-Speed Downlink Shared Channel(HS-DSCH) employing N-Channel Stop and Wait retransmission scheme in High Speed Downlink Packet Access(HSDPA) system. The proposed SPD coordinates packet transmissions according to the channel condition. When the channel condition is bad, packet transmission is forcedly delayed, and the designated time slot is set over to other users in good channel condition. Hence, the SPD is able to reduce the average transmission delay for packet transmission under the burst error environments. In addition, we propose two packet scheduling schemes called SPD-LDPF(Long Delayed Packet First) and SPD-DCRR(Deficit Compensated Round Robin) that are effectively combined with the SPD scheme. Simulation results show that the proposed scheme has better performance in terms of delay, throughput and fairness.

Iub Congestion Detection Method for WCDMA HSUPA Network to Improve User Throughput (WCDMA HSUPA 망의 성능 향상을 위한 Iub 혼잡 검출 방법)

  • Ahn, Ku-Ree;Lee, Tae-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.1A
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    • pp.16-24
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    • 2010
  • High Speed Uplink Packet Access(HSUPA) is a WCDMA Release 6 technology which corresponds to High Speed Downlink Packet Access(HSDPA). Node B Supports fast scheduling, Hybrid ARQ(HARQ), short Transmission Time Interval(TTI) for high rate uplink packet data. It is very important to detect Iub congestion to improve end user's Quality of Service(QoS). This paper proposes Node B Congestion Detection(BCD) mechanism and suggests to use the hybrid of Transport Network Layer(TNL) congestion detection and BCD. It is shown that HSUPA user throughput performance can be improved by the proposed method even with small Iub bandwidth.

Unified Optimal Power Allocation Strategy for MIMO Candidates in 3GPP HSDPA

  • Kim, Sung-Jin James;Kim, Ho-Jin;Lee, Kwang-Bok
    • ETRI Journal
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    • v.27 no.6
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    • pp.768-776
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    • 2005
  • We compare the achievable throughput of time division multiple access (TDMA) multiple-input multiple-output (MIMO) schemes illustrated in the 3rd Generation Partnership Project (3GPP) MIMO technical report, versus the sum-rate capacity of space-time multiple access (STMA). These schemes have been proposed to improve the 3GPP high speed downlink packet access (HSDPA) channel by employing multiple antennas at both the base station and mobile stations. Our comparisons are performed in multi-user environments and are conducted using TDMA such as Qualcomm's High Data Rate and HSDPA, which is a simpler technique than STMA. Furthermore, we present the unified optimal power allocation strategy for HSDPA MIMO schemes by exploiting the similarity of multiple antenna systems and multi-user channel problems.

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HSPA/HSPA+ Terminal Signal Measurement Algorithm and Software (HSPA/HSPA+ 단말 신호 측정 알고리즘 및 소프트웨어)

  • Cho, Tae-Kyung
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.60 no.1
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    • pp.37-44
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    • 2011
  • HSPA(High Speed Packet Access)/HSPA+ is a combined 3GPP(Third Generation Partnership Project) standard of HSDPA(High Speed Downlink Packet Access) and HSUPA(High Speed Uplink Packet Access). The standard can provide the high speed multimedia service against the 3GPP release 99 standard. In order to test the 3GPP HSPA/HSPA+ terminal performance, the measurement hardware is required for the evaluate the transmitted signal of HSPA/HSPA+ terminals. Agilent Technologies and Innowireless produce the measurement equipments for HSPA/HSPA+ terminals. Generally speaking, the receiving algorithms in normal modems cannot be used directly to the measurement system due to the lack of the algorithm accuracy. In this paper, we propose the new receiver algorithm for precise measurement of 3GPP HSPA/HSPA+ terminal signal, and implement measurement functionality for performance measurement of the 3GPP HSPA/HSPA+ terminal by using software. The proposed 3GPP HSPA/HSPA+ signal measurement algorithm can be used for the commercial system through code execution speed optimization.