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1. 发明授权

US07746837B2 Overhear-based transmitting control system in WLANS 有权
标题翻译： WLANS中基于过滤的发射控制系统
公开(公告)号：US07746837B2
公开(公告)日：2010-06-29
申请号：US11675954
申请日：2007-02-16
申请人： Ha-young Oh , Sung-ro Yoon , Ki-baek Yoo , Chong-kwon Kim
发明人： Ha-young Oh , Sung-ro Yoon , Ki-baek Yoo , Chong-kwon Kim
IPC分类号： H04W4/00
CPC分类号： H04L1/1887 , H04L2001/0097 , H04W28/06 , H04W74/00 , H04W84/12 , H04W84/22
摘要： We propose overhear-based transmitting control system in WLANs to improve performance of 802.11 wireless LANs. The main idea of this scheme is that when the transmission of a node fails, one of neighboring nodes with better channel quality retransmits the lost frame in substitution. To do so, every node should maintain overhear table to buffer the transmitted packets that is not yet acknowledged. We also present algorithms to retransmit lost packets, to maintain the overhear table and to compensate for the retransmission of packets of other nodes. The performance of this scheme is evaluated via simulations in terms of MPDU size and average path loss. It shows that in environments where the packet is likely to be lost more, the throughput gain of our proposed scheme performs better.
摘要翻译：我们在WLAN中提出了基于概念的发射控制系统，以提高802.11无线局域网的性能。该方案的主要思想是当一个节点的传输失败时，具有较好信道质量的一个相邻节点将替代丢失的帧。为此，每个节点都应该保持监听表缓冲未被确认的传输的数据包。我们还提出了重传丢失数据包的算法，以维护监听表并补偿其他节点的数据包的重传。通过MPDU大小和平均路径损耗的模拟来评估该方案的性能。这表明在数据包可能丢失的环境中，我们提出的方案的吞吐量增益表现更好。

2. 发明申请

US20080181101A1 OVERHEAR-BASED TRANSMITTING CONTROL SYSTEM IN WLANS 有权
标题翻译： WLANS中的基于过载的发射控制系统
公开(公告)号：US20080181101A1
公开(公告)日：2008-07-31
申请号：US11675954
申请日：2007-02-16
申请人： Ha-young OH , Sung-ro Yoon , Ki-baek Yoo , Chong-kwon Kim
发明人： Ha-young OH , Sung-ro Yoon , Ki-baek Yoo , Chong-kwon Kim
IPC分类号： G01R31/08
CPC分类号： H04L1/1887 , H04L2001/0097 , H04W28/06 , H04W74/00 , H04W84/12 , H04W84/22
摘要： We propose overhear-based transmitting control system in WLANs to improve performance of 802.11 wireless LANs. The main idea of this scheme is that when the transmission of a node fails, one of neighboring nodes with better channel quality retransmits the lost frame in substitution. To do so, every node should maintain overhear table to buffer the transmitted packets that is not yet acknowledged. We also present algorithms to retransmit lost packets, to maintain the overhear table and to compensate for the retransmission of packets of other nodes. The performance of this scheme is evaluated via simulations in terms of MPDU size and average path loss. It shows that in environments where the packet is likely to be lost more, the throughput gain of our proposed scheme performs better.
摘要翻译：我们在WLAN中提出了基于概念的发射控制系统，以提高802.11无线局域网的性能。该方案的主要思想是当一个节点的传输失败时，具有较好信道质量的一个相邻节点将替代丢失的帧。为此，每个节点都应该保持监听表缓冲未被确认的传输的数据包。我们还提出了重传丢失数据包的算法，以维护监听表并补偿其他节点的数据包的重传。通过MPDU大小和平均路径损耗的模拟来评估该方案的性能。这表明在数据包可能丢失的环境中，我们提出的方案的吞吐量增益表现更好。

3. 发明申请

US20080063106A1 Distributed opportunistic scheduling in IEEE 802.11 wireless location area networks (WLANs) 有权
标题翻译： IEEE 802.11无线定位区域网络（WLAN）中的分布式机会调度
公开(公告)号：US20080063106A1
公开(公告)日：2008-03-13
申请号：US11520541
申请日：2006-09-13
申请人： Seong-il Hahm , Jong-won Lee , Chong-kwon Kim
发明人： Seong-il Hahm , Jong-won Lee , Chong-kwon Kim
IPC分类号： H04L1/02
CPC分类号： H04W74/0825 , H04L1/0003
摘要： A WLAN distributed/opportunistic scheduling (WDOS) method for acquiring a multi-user diversity gain is disclosed. The WDOS method allows a transmitter (i.e., a transmission user) to observe channel conditions of receivers (i.e., reception users), and commands the transmitter to transmit packets to a specific receiver having a relative good channel condition. The WDOS method uses a modified RTS/CTS exchange method to perform the channel probing. If the transmitter broadcasts the BRTS frame, each receiver transmits a CTS frame after the lapse of its backoff period. According to the reception signal strength distribution, the backoff delay time minimizes the number of CTS collisions irrespective of the number of receivers, reduces an amount of channel probing overheads, and maximizes a multi-user diversity gain. The better the relative channel condition, the lower the backoff delay time.
摘要翻译：公开了一种用于获取多用户分集增益的WLAN分布/机会调度（WDOS）方法。 WDOS方法允许发射机（即传输用户）观察接收机（即，接收用户）的信道状况，并命令发射机向具有相对良好信道状态的特定接收机发送分组。 WDOS方法使用修改的RTS / CTS交换方法来执行信道探测。如果发射机广播BRTS帧，则每个接收机在其退避周期过去之后发送CTS帧。根据接收信号强度分布，回退延迟时间使CTS冲突的数量最小化，而与接收机的数量无关，减少了信道探测开销的数量，并使多用户分集增益最大化。相对通道条件越好，退避延迟时间越短。

4. 发明授权

US07792138B2 Distributed opportunistic scheduling in IEEE 802.11 wireless location area networks (WLANs) 有权
标题翻译： IEEE 802.11无线定位区域网络（WLAN）中的分布式机会调度
公开(公告)号：US07792138B2
公开(公告)日：2010-09-07
申请号：US11520541
申请日：2006-09-13
申请人： Seong-il Hahm , Jong-won Lee , Chong-kwon Kim
发明人： Seong-il Hahm , Jong-won Lee , Chong-kwon Kim
IPC分类号： H04J3/02
CPC分类号： H04W74/0825 , H04L1/0003
摘要： A WLAN distributed/opportunistic scheduling (WDOS) method for acquiring a multi-user diversity gain is disclosed. The WDOS method allows a transmitter (i.e., a transmission user) to observe channel conditions of receivers (i.e., reception users), and commands the transmitter to transmit packets to a specific receiver having a relative good channel condition. The WDOS method uses a modified RTS/CTS exchange method to perform the channel probing. If the transmitter broadcasts the BRTS frame, each receiver transmits a CTS frame after the lapse of its backoff period. According to the reception signal strength distribution, the backoff delay time minimizes the number of CTS collisions irrespective of the number of receivers, reduces an amount of channel probing overheads, and maximizes a multi-user diversity gain. The better the relative channel condition, the lower the backoff delay time.
摘要翻译：公开了一种用于获取多用户分集增益的WLAN分布/机会调度（WDOS）方法。 WDOS方法允许发射机（即传输用户）观察接收机（即，接收用户）的信道状况，并命令发射机向具有相对良好信道状态的特定接收机发送分组。 WDOS方法使用修改的RTS / CTS交换方法来执行信道探测。如果发射机广播BRTS帧，则每个接收机在其退避周期过去之后发送CTS帧。根据接收信号强度分布，回退延迟时间使CTS冲突的数量最小化，而与接收机的数量无关，减少了信道探测开销的数量，并使多用户分集增益最大化。相对通道条件越好，退避延迟时间越短。

5. 发明授权

US07773558B2 Wireless network channel allocation method and multi-hop wireless network system using the same 有权
标题翻译：无线网络信道分配方法和多跳无线网络系统使用相同
公开(公告)号：US07773558B2
公开(公告)日：2010-08-10
申请号：US11673886
申请日：2007-02-12
申请人： Seongho Cho , Chong-kwon Kim
发明人： Seongho Cho , Chong-kwon Kim
IPC分类号： H04W4/00
CPC分类号： H04W16/10 , H04W48/08 , H04W48/16 , H04W72/00 , H04W72/082 , H04W84/18 , H04W88/04
摘要： Multi-hop wireless networks have benefits in coverage extension and throughput improvement. In this multi-hop wireless networks, multiple channels are available to improve system performance through concurrent transmission. In this invention, a multi-channel assignment method is described. For efficient utilization of multiple channels considering different channel condition at each node, the multi-channel assignment method is comprising the steps of: a) gathering neighbor relay node information by relaying control messages which include node information, such as the list of neighbor nodes, the preferable channel list of nodes, and the number of available radio interfaces; b) connectivity graph construction, by generating the multi-graph connectivity graph from the gathered node information; c) conflict graph composition, by generating the multi-channel conflict graph which exhibits interference among links from the multi-graph connectivity graph; and d) multi-channel assignment, by allocating channels to links considering channel interference by referring the multi-channel conflict graph using the list coloring algorithm.
摘要翻译：多跳无线网络在覆盖扩展和吞吐量改进方面具有优势。在这种多跳无线网络中，多个信道可用于通过并发传输来提高系统性能。在本发明中，描述了多信道分配方法。为了有效利用考虑各个节点的不同信道状况的多个信道，多信道分配方法包括以下步骤：a）通过中继包含诸如邻居节点列表等节点信息的控制消息来收集邻居中继节点信息，节点的优选频道列表和可用无线电接口的数量; b）通过从所收集的节点信息生成多图连通图;连接图构造; c）冲突图组合，通过产生多通道冲突图，其显示来自多图连通图的链路之间的干扰; 以及d）多通道分配，通过使用列表着色算法参考多通道冲突图，通过分配信道来考虑信道干扰。

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