Sangwon Choi
Samsung
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Featured researches published by Sangwon Choi.
international conference on communications | 2015
Peng Xue; Hyunseok Ryu; Seong-Hoon Park; Sangwon Choi
In the Long Term Evolution (LTE) based device-to-device (D2D) communication systems, there are two resource access modes, i.e., eNB scheduled and random access. The eNB scheduled resource access gives flexibility to eNB with additional signalling overhead. The random access scheme is simple without the eNB control but has the drawback of data collision. In this paper, we propose a collision-aware random access scheme for the D2D communications. The proposed scheme utilizes the feature that there are many unused resources in the data transmission period and all user equipments (UEs) have full information about the resource usage. Before data transmission, the UEs send the resource reservation messages in the unused resource to inform others about the selected resources to be used in the next period. By this means, the D2D UEs can detect the resource reservation messages from each other, and hence can try to select different resources to avoid collision. The performance of the proposed scheme is analyzed and evaluated by simulations. Our results shown that the proposed scheme outperforms the random access scheme by a wide margin in terms of data collision probability.
Archive | 2015
Hyunseok Ryu; Seung-Hoon Park; Peng Xue; Hyun-Kyu Yu; Cheol Jeong; Sangwon Choi
Archive | 2015
Peng Xue; Hyunseok Ryu; Seung-Hoon Park; Hyun-Kyu Yu; Cheol Jeong; Sangwon Choi
Archive | 2015
Hyunseok Ryu; Peng Xue; Seung-Hoon Park; Sangwon Choi
Archive | 2015
Peng Xue; Hyunseok Ryu; Seung-Hoon Park; Sangwon Choi
Archive | 2015
Seung-Hoon Park; Hyunseok Ryu; Peng Xue; Chi-Woo Lim; Sangwon Choi
Archive | 2016
Hyunseok Ryu; Peng Xue; Sangwon Choi
Archive | 2015
Hyunseok Ryu; Seung-Hoon Park; Jeong-Ho Park; Hyun-Kyu Yu; Sangwon Choi
Archive | 2015
Seung-Hoon Park; Hyunseok Ryu; Peng Xue; Hyun-Kyu Yu; Cheol Jeong; Sangwon Choi
Archive | 2015
Peng Xue; Seung-Hoon Park; Hyunseok Ryu; Jeongho Park; Sangwon Choi