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公开(公告)号：US09401738B2
公开(公告)日：2016-07-26
申请号：US14799413
申请日：2015-07-14
摘要： A method of closed-loop antenna tuning (CLAT) search strategy based on maximum Relative Transducer Gain (RTG) is proposed. A search region that account for TX input mismatch and forward voltage gain is pre-computed. The search region that is independent of antenna load can be pre-computed to reduce the computation complexity. The Maximum RTG is searched by estimating antenna S-parameters corresponding to a good load match. The search is conducted between the peak forward voltage gain and the best load match. Global optimal with reasonable RTG can be found with limited number of iterations. The transmitter search region can further be constrained by the receiver path mismatching.
摘要翻译： 提出了一种基于最大相对传感器增益（RTG）的闭环天线调谐（CLAT）搜索策略。 预先计算了考虑到TX输入失配和正向电压增益的搜索区域。 可以预先计算独立于天线负载的搜索区域，以减少计算复杂度。 通过估计对应于良好负载匹配的天线S参数来搜索最大RTG。 搜索在峰值正向电压增益和最佳负载匹配之间进行。 可以用有限的迭代次数找到具有合理RTG的全局最优化。 发射机搜索区域可以进一步受到接收机路径不匹配的约束。
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公开(公告)号：US20160157264A1
公开(公告)日：2016-06-02
申请号：US14998126
申请日：2015-12-24
发明人： James June-Ming Wang , Jianhan Liu , YungPing Hsu
IPC分类号： H04W72/12
CPC分类号： H04W72/1257 , H04W74/0808
摘要： A method of channel contention procedure with CCA level enhancement is proposed. A wireless device initiates an EDCA channel contention procedure to gain access to the wireless medium. The device determines an intended TX channel width and performs primary channel CCA using a set of CCA levels based on the intended TX channel width for determining channel idle or busy condition in the EDCA procedure. Upon gaining access, the device performs secondary channel CCA and thereby determining a final TX channel width. The device transmits radio signals using the final TX channel width and a TX spectral power density, which is adjusted to be corresponding to the intended TX channel width. By raising CCA levels to be based on the intended transmission channel width, the likelihood of wide channel width transmission is increased. As a result, significant network throughput increase can be accomplished in dense deployment scenarios.
摘要翻译： 提出了一种具有CCA级别增强的信道争用过程的方法。 无线设备发起EDCA信道争用过程以访问无线介质。 设备确定预期的TX信道宽度，并且使用基于预期TX信道宽度的一组CCA级别来执行主信道CCA，以在EDCA过程中确定信道空闲或繁忙状态。 在获得访问时，设备执行辅助信道CCA，从而确定最终的TX信道宽度。 设备使用最终TX信道宽度和TX频谱功率密度来发射无线电信号，该频谱功率密度被调整为对应于预期的TX信道宽度。 通过提高基于预期传输信道宽度的CCA级别，增加宽信道宽度传输的可能性。 因此，在密集部署情况下可以实现显着的网络吞吐量增加。
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23.发明授权公开(公告)号：US09344165B2
公开(公告)日：2016-05-17
申请号：US14960690
申请日：2015-12-07
发明人： James June-Ming Wang
CPC分类号： H04B7/043 , H04B7/0417 , H04B7/063 , H04B7/0695 , H04B7/0697 , H04B7/088 , H04J11/0063
摘要： The disclosed invention provides an efficient method for MIMO beam training for multiple antennas to enable spatial multiplexing MIMO operation and spatial combining in a wireless network. The invention discloses a simple and efficient beam-training algorithm and protocol for MIMO operation that operates in high SNR condition for reliable MIMO operation. In one novel aspect, the best MIMO beam combinations are determined after TX sector sweeping and RX sector sweeping. The best MIMO beam combinations are determined in such a way that no any selected TX/RX sectors come from the same TX/RX antenna/beamformer. The selection criteria includes not only signal quality, but also considers mutual interference and leakage among multiple MIMO spatial streams to improve overall MIMO performance. Simultaneous RX or TX training are also supported to reduce training time.
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公开(公告)号：US20160112107A1
公开(公告)日：2016-04-21
申请号：US14979429
申请日：2015-12-27
发明人： James June-Ming Wang , Jianhan Liu , Thomas Edward PARE, JR. , Chao-Chun Wang , Chih-Shi Yee , YungPing Hsu
摘要： A method of enhanced beamforming procedure to achieve spatial reuse and thereby improving cell edge performance and area throughput is proposed. The enhanced beamforming method increases the likelihood of channel access under dense deployment condition, reduces interference to OBSS, reduces collision during reception, and increases the likelihood of spatial reuse in dense deployment scenario thus leading to higher network throughput.
摘要翻译： 提出了一种增强波束成形过程实现空间重用，从而提高小区边缘性能和面积吞吐量的方法。 增强的波束成形方法增加了密集部署条件下信道接入的可能性，减少了对OBSS的干扰，减少了接收过程中的冲突，并增加了密集部署场景中空间重用的可能性，从而导致更高的网络吞吐量。
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公开(公告)号：US20130315325A1
公开(公告)日：2013-11-28
申请号：US13899540
申请日：2013-05-21
发明人： James June-Ming Wang , Vishakan Ponnampalam , Jianhan Liu , Chao-Chun Wang , Chi-Shi Yee , YungPing Hsu
IPC分类号： H04B7/04
CPC分类号： H04B7/0697 , H04B7/0417 , H04B7/043 , H04B7/0695 , H04B7/088
摘要： The disclosed invention provides an efficient method for beam training to enable spatial multiplexing MIMO operation and spatial combining in a wireless network. The invention discloses a simple and efficient beam-training algorithm and protocol for MIMO operation that operates in high SNR condition for reliable MIMO operation. In one novel aspect, the best MIMO beam combinations are determined after TX sector sweeping and RX sector sweeping. In addition, the selection criteria includes not only signal quality, but also considers mutual interference and leakage among multiple MIMO spatial streams to improve overall MIMO performance.
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公开(公告)号：US11659581B2
公开(公告)日：2023-05-23
申请号：US16842652
申请日：2020-04-07
发明人： James June-Ming Wang , Yongho Seok , James Chih-Shi Yee , Jianhan Liu , Thomas Edward Pare, Jr.
IPC分类号： H04W72/08 , H04B17/336 , H04W16/28 , H04W24/10 , H04W72/04 , H04W80/08 , H04W72/541 , H04W72/044
CPC分类号： H04W72/541 , H04B17/336 , H04W16/28 , H04W24/10 , H04W72/046 , H04W80/08
摘要： Embodiments of the present invention provide a method and device for multi-AP beamforming (e.g., nulling) and spatial reuse to mitigate interference and improve the performance of MAP wireless networks. According to one embodiment, multiple APs agree to collaborate in multi-AP beamforming, transmissions of received PDDUs are measured to determine interference information, the APS generate interference maps, and the APs perform joint and Multi-AP beamforming in a first and second BSS to avoid/mitigate interference of the MAP wireless network. An RTS and CTS frame exchange sequence can be performed prior to Multi-AP beamforming between BSSs using a flag/indicator in the RTS frame to indicate coordinated transmission, or an UL trigger frame can be used to indicate a coordinated UL transmission.
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公开(公告)号：US11190986B2
公开(公告)日：2021-11-30
申请号：US16590130
申请日：2019-10-01
发明人： Jianhan Liu , Yongho Seok , James June-Ming Wang , James Chih-Shi Yee , Thomas Edward Pare, Jr.
IPC分类号： H04W28/26 , H04L5/00 , H04W74/06 , H04W24/10 , H04W72/04 , H04W28/02 , H04W88/12 , H04W84/12
摘要： Mechanisms of CCA status reporting and NAV distribution for coordinated transmissions in a multi-AP WLAN. A coordinator AP may broadcast a RTS frame to a set of coordinated APs, which allow the coordinated APs with a CCA clear status to set a protected period in a CST frame to silence the associated non-AP STAs. The coordinator AP also polls the coordinated APs to have them individually report their CCA statuses as well as additional information used for transmission coordination. In some embodiments, a status report from a coordinated AP may integrate the protected period setting and the CCA clean status indication, and therefore the coordinator AP just needs to poll for such a report without using RTS/CTS exchange. A coordinated AP may set a protected period to end at the complete transmission of a coordination frame. The coordination frame may specify the remaining TXOP duration information.
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公开(公告)号：US20190288767A1
公开(公告)日：2019-09-19
申请号：US16351236
申请日：2019-03-12
发明人： James June-Ming Wang , Thomas Edward PARE, Jr. , Yongho Seok , Gabor Bajko , Jianhan Liu , Tianyu Wu
IPC分类号： H04B7/14 , H04B7/0452 , H04L27/26 , H04W16/12 , H04W52/24
摘要： Systems and methods of WLAN communication including efficient spatial reuse mechanisms for relay transmissions between a repeater network and non-AP STAs in OFDMA. The non-AP STAs are grouped based on their connectivity with the individual repeaters and the radio coverage regions of the repeaters. Each group is either a non-overlapping group with the constituent non-AP STAs located in a non-overlapping coverage region of a particular repeater, or an overlapping group with the constituent non-AP STAs located in an overlapping coverage region of two or more repeaters. Based on the grouping, certain RUs (or subchannels) are reused for multiple groups without causing inter-group interference, thereby expanding the bandwidths used in the relay operations. RU allocation based on grouping can be used in combination with transmit power adjustment to achieve efficient spatial reuse in OFDMA.
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29.发明授权公开(公告)号：US09883547B2
公开(公告)日：2018-01-30
申请号：US15409957
申请日：2017-01-19
发明人： Chao-Chun Wang , Jianhan Liu , Chih-Shi Yee , Huanchun Ye , James June-Ming Wang
摘要： A communication method that operates by determining a first set of physical parameters of a first channel by a coordinator in a wireless communication system; establishing communication with a first set of devices over the first channel; determining a protection period in accordance with a pre-determined rule; broadcasting a channel-adjustment message, wherein the channel-adjustment message comprises a set of instructions for indicating how to adjust from the first channel to a second channel, and the set of instructions comprise channel bandwidth information for indicating how to adjust to a bandwidth of the second channel and central frequency information for indicating how to adjust to a central frequency of the second channel; and communicating with a second set of devices over the second channel during the protection period.
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30.发明申请公开(公告)号：US20160128099A1
公开(公告)日：2016-05-05
申请号：US14995560
申请日：2016-01-14
发明人： Jianhan Liu , James June-Ming Wang
IPC分类号： H04W74/08
CPC分类号： H04W74/08 , H04W74/0808 , H04W84/12
摘要： A method to improve channel access opportunity for wide bandwidth transmission in wireless local area networks is proposed. The method allows different clear channel assessment (CCA) thresholds for different transmission channel bandwidth. During a primary channel CCA process, a low CCA threshold level is applied for an intended narrow transmission channel bandwidth, while a high CCA threshold level is applied for an indented wide transmission channel bandwidth. In addition to the “all bandwidth transmission branch” that is based on the low CCA level, the “wide bandwidth transmission branch” is based on the high CCA level, which increases the opportunity for channel access by raising the CCA levels based on intended transmission channel bandwidths. As a result, the likelihood of wide channel transmission is increased.
摘要翻译： 提出了一种改善无线局域网宽带传输的信道接入机会的方法。 该方法允许不同传输信道带宽的不同的清除信道评估（CCA）阈值。 在主信道CCA处理期间，对于预期的窄传输信道带宽应用低CCA阈值电平，而对于缩进的宽传输信道带宽应用高CCA阈值电平。 除了基于低CCA级别的“全带宽传输分支”之外，“宽带宽传输分支”是基于高CCA级别，其通过基于预期传输提高CCA级别来增加信道接入的机会 通道带宽。 结果，增加了信道传输的可能性。
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