Do Hyon Yim
Samsung
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Publication
Featured researches published by Do Hyon Yim.
IEEE Transactions on Vehicular Technology | 2008
Alexandre V. Garmonov; Seok Ho Cheon; Do Hyon Yim; Ki Tae Han; Yun Sang Park; Andrew Y. Savinkov; Stanislav Filin; Sergey N. Moiseev; Mikhail S. Kondakov
In this paper, we consider the quality-of-service (QoS)-oriented intersystem handover between the IEEE 802.11b network and the overlay network. We propose the handover scheme and algorithm that guarantee to simultaneously meet the three key QoS parameters, that is, the minimum data rate, the maximum data block delay, and the maximum bit error rate, for the arbitrary number of downlink and uplink multiservice connections. In addition to the QoS requirements, our intersystem handover scheme guarantees to keep the call-dropping probability during the handover and the sum of the average number of ping-pong events during the entry to and the exit from the IEEE 802.11b system below the predetermined values. We define the IEEE 802.11b network as the priority network for the mobile station. Thus, we maximize the time during which the mobile station is served by the IEEE 802.11b network while satisfying the QoS requirements in both networks, as well as the maximum call-dropping probability and the maximum average number of ping-pong event constraints. To solve this task, we propose a novel intersystem handover scheme that utilizes the minimum signal-to-noise ratio threshold, entry hysteresis, and exit hysteresis.
international conference on communications | 2006
Stanislav Filin; Sergey N. Moiseev; Mikhail S. Kondakov; Alexandre V. Garmonov; Do Hyon Yim; Jae Ho Lee; Sun-Ny Chang; Yun Sang Park
In this paper, we analyze the IEEE 802.16 OFDMA system with adaptive allocation of the frequency subchannels to the users. We perform adaptive coding and modulation, allocation of the time-frequency resource, the transmit power, and the frequency subchannels to the downlink and uplink service flows, which are scheduled for transmission in the current frame. Moreover, we consider adaptation of the frame boundary between the downlink and uplink subframes. We minimize the sum time-frequency resource, allocated in both downlink and uplink subframes, under the constraints on the maximum transmit power and the time-frequency resource available in the frame, while satisfying the QoS requirements for all downlink and uplink service flows scheduled for transmission. We propose the cross-layer optimization algorithms, which take into account the MAC and PHY layers processing during the optimization. We also present the results of the proposed algorithms evaluation by system level simulation.
wireless communications and networking conference | 2006
Stanislav Filin; Sergey N. Moiseev; Mikhail S. Kondakov; Alexandre V. Garmonov; Do Hyon Yim; Jae Ho Lee; Sun-Ny Chang; Yun Sang Park
In this paper, we analyze the IEEE 802.16 OFDMA system with the frequency diversity frame structure. We perform adaptive coding and modulation, allocation of the time-frequency resource and transmit power to the downlink and uplink service flows, which are scheduled for transmission in the current frame. Also, we consider adaptation of the frame boundary between the downlink and uplink subframes. We minimize the sum time-frequency resource, allocated in both downlink and uplink subframes, under the constraints on the maximum transmit power and the time-frequency resource, available in the frame, while satisfying the QoS requirements for all downlink and uplink service flows, scheduled for transmission. We propose the cross-layer optimization algorithms, which take into account the MAC and PHY layers processing during the optimization
international conference on communications | 2006
Sergey N. Moiseev; Stanislav Filin; Mikhail S. Kondakov; Alexandre V. Garmonov; Do Hyon Yim; Jae Ho Lee; Sun-Ny Chang; Yun Sang Park
In the IEEE 802.16 network the SINR per subcarrier, the average SINR, and the SINR RMS are stochastic processes. In this paper, we analyze the statistical properties of these stochastic processes using system level simulation. We present the probability density functions for the SINR per subcarrier and the average SINR stochastic processes expressed in both logarithmic and linear scales. We also present the probability density function for the SINR RMS stochastic process, expressed in the logarithmic scale. The results, obtained in this paper, allow using the statistical approach while developing the adaptive transmission algorithms for the IEEE 802.16 network.
personal, indoor and mobile radio communications | 2005
Alexandre V. Garmonov; Andrew Y. Savinkov; Stanislav Filin; Vladimir B. Manelis; Sergey N. Moiseev; Mikhail S. Kondakov; Seok Ho Cheon; Do Hyon Yim; Ki Tae Han; Yun Sang Park
In this paper we theoretically perform joint fragment size and transmission rate optimization for request-to-send/clear-to-send mechanism of IEEE 802.11b distributed coordination function considering both collisions due to system load and frame errors due to nonideal channel conditions. We have chosen system throughput maximization as the optimization criteria
global communications conference | 2006
Sergey N. Moiseev; Stanislav Filin; Mikhail S. Kondakov; Alexandre V. Garmonov; Andrew Y. Savinkov; Yun Sang Park; Do Hyon Yim; Jae Ho Lee; Seok Ho Cheon; Ki Tae Han
In this paper we propose a load-balancing QoS- guaranteed handover algorithm in the IEEE 802.16e OFDMA network. We describe our system load model for the IEEE 802.16e OFDMA network and propose the optimal and fast handover algorithms. We evaluate our fast handover algorithm using system level simulation of the IEEE 802.16e OFDMA network. Our fast load-balancing handover algorithm eliminates overloading, thus guarantees meeting the QoS requirements of the users. It also provides a considerable throughput gain over the traditional SINR-based handover algorithm.
vehicular technology conference | 2006
Stanislav Filin; Sergey N. Moiseev; Mikhail S. Kondakov; Alexandre V. Garmonov; Andrew Y. Savinkov; Yun Sang Park; Do Hyon Yim; Jae Ho Lee; Seok Ho Cheon; Ki Tae Han
We consider the IEEE 802.16 OFDMA system with the frequency diversity frame structure. We perform adaptive coding and modulation, allocation of the time-frequency resource and transmit power to the downlink and uplink service flows, scheduled for transmission in the current frame. We also adapt the position of the frame boundary between the uplink and downlink subframes. We propose three heuristic algorithms that minimize the total power transmitted in both downlink and uplink subframes subject to the maximum transmission power constraints and the available time-frequency resource constraint, while satisfying the QoS requirements for all downlink and uplink service flows scheduled for transmission. Our algorithms take into account the MAC and PHY layers processing in case of ARQ. We evaluate the proposed heuristic algorithms by the system level simulation of the IEEE 802.16 network.
personal, indoor and mobile radio communications | 2006
Sergey N. Moiseev; Stanislav Filin; Mikhail S. Kondakov; Alexandre V. Garmonov; Andrew Y. Savinkov; Yun Sang Park; Do Hyon Yim; Jae Ho Lee; Seok Ho Cheon; Ki Tae Han
In this paper we propose the load-balancing QoS-guaranteed handover algorithm in the IEEE 802.11 network. We present our system load model in the IEEE 802.11 network and describe the optimal and fast handover algorithms. We evaluate our fast handover algorithm using system level simulation of the IEEE 802.11b network. Our fast load-balancing handover algorithm eliminates the overloading, thus guarantees meeting the QoS requirements of the users. It also provides a considerable throughput gain over the SNR-based handover algorithm
european conference on wireless technology | 2005
Stanislav Filin; Alexandre V. Garmonov; Andrew Y. Savinkov; Vladimir B. Manelis; Sergey N. Moiseev; Mikhail S. Kondakov; Seok Ho Cheon; Do Hyon Yim; Ki Tae Han; Yun Sang Park
In this paper we theoretically perform joint fragment size and transmission rate optimization for basic access mechanism of IEEE 802.11b distributed coordination function considering both collisions due to system load and frame errors due to non-ideal channel conditions. We have chosen system throughput maximization as the optimization criteria
personal, indoor and mobile radio communications | 2006
Sergey N. Moiseev; Stanislav Filin; Mikhail S. Kondakov; Alexandre V. Garmonov; Andrew Y. Savinkov; Yun Sang Park; Do Hyon Yim; Jae Ho Lee; Seok Ho Cheon; Ki Tae Han
In this paper for the IEEE 802.16 OFDMA system we propose the fast algorithm to find the optimal average number of data block transmissions that minimizes the total downlink and uplink transmission power subject to satisfying QoS requirements. We show that the optimal average number of data block transmissions in the IEEE 802.16 OFDMA system is almost independent of the coding and modulation scheme used, propagation channel model, and data block size. In the IEEE 802.16 OFDMA system the optimal average number of data block transmissions is very close to 1.18
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National Institute of Information and Communications Technology
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