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    • 6. 发明授权
    • Scheduling algorithms for multi-user (MU) multiple-input multiple-output (MIMO) communication systems
    • 多用户(MU)多输入多输出(MIMO)通信系统的调度算法
    • US09184810B2
    • 2015-11-10
    • US13465522
    • 2012-05-07
    • Zhi QuanSimone MerlinSantosh Paul AbrahamSameer VermaniHemanth Sampath
    • Zhi QuanSimone MerlinSantosh Paul AbrahamSameer VermaniHemanth Sampath
    • H04W4/00H04B7/04H04W72/12
    • H04B7/0452H04W72/12H04W72/1221
    • A method is provided for wirelessly transmitting from a transmitter to one or more receivers within a multi-user (MU) multiple-input and multiple-output (MIMO) communication system. A number of concurrent (spatial) streams are dynamically allocated in a MU-MIMO transmission to each of a plurality of served receivers to maximize total data transmitted on each transmission. Streams are allocated according to a corresponding transmission queue length for each receiver and the number of receive antennas used by each of the served receivers. A transmission timer is started upon sending the transmission. A random backoff counter is also started upon one of either: (a) expiration of the transmission timer or (b) receipt of data at a transmission queue. A new transmission is sent upon expiration of the random backoff counter if the transmission timer has expired. Otherwise, the random backoff counter is restarted one or more times until the transmission timer has expired.
    • 提供了一种用于从多用户(MU)多输入(MIMO)通信系统中的发射机向一个或多个接收机进行无线发射的方法。 在MU-MIMO传输中动态地将多个并行(空间)流分配给多个服务接收机中的每一个,以最大化在每个传输上传输的总数据。 流根据每个接收机的相应传输队列长度和每个被服务接收机使用的接收天线的数量来分配。 传送定时器在发送传输时开始。 以下之一也开始随机退避计数器:(a)传输定时器到期或(b)在传输队列处接收数据。 如果发送定时器已经到期,则在随机退避计数器到期时发送新的传输。 否则,随机退避计数器重新启动一次或多次,直到传输定时器到期。
    • 7. 发明授权
    • Protocols for enabling mode 1 and mode 2 devices in TV white space networks
    • 在电视空白网络中启用模式1和模式2设备的协议
    • US09173218B2
    • 2015-10-27
    • US13286515
    • 2011-11-01
    • Santosh Paul AbrahamAvinash JainStephen J. ShellhammerHemanth Sampath
    • Santosh Paul AbrahamAvinash JainStephen J. ShellhammerHemanth Sampath
    • H04W16/14H04W72/04H04L5/00H04W88/06
    • H04W72/0453H04L5/0096H04W16/14H04W88/06
    • Certain aspects of the present disclosure provide techniques and apparatus for operating in a television white space (TVWS) network. One example method generally includes receiving, at an apparatus, a message with a field indicating a current version of an unused frequency spectrum map (e.g., a white space map (WSM)), the unused frequency spectrum map indicating channels usable for wireless communications; determining whether the current version of the unused frequency spectrum map is different than a previous version of the unused frequency spectrum map; and using a channel for wireless communications based on the determination. Another example method generally includes accessing a database of available channels for a current location of an apparatus via a neighboring portable or fixed enabling apparatus and enabling one or more portable dependent apparatuses for the wireless communications via one or more of the available channels.
    • 本公开的某些方面提供了用于在电视空白(TVWS)网络中操作的技术和装置。 一个示例性方法通常包括在装置处接收具有指示未使用频谱图(例如,空白映射(WSM))的当前版本的字段的消息,该未使用频谱图指示可用于无线通信的信道; 确定当前版本的未使用频谱图是否与未使用的频谱图的先前版本不同; 以及基于该确定使用用于无线通信的信道。 另一示例性方法通常包括经由相邻便携式或固定的启用设备访问设备的当前位置的可用信道的数据库,并且使得一个或多个便携式依赖设备经由一个或多个可用信道实现无线通信。
    • 9. 发明授权
    • Power control for wireless LAN stations
    • 无线局域网站功率控制
    • US09031044B2
    • 2015-05-12
    • US12352733
    • 2009-01-13
    • Hemanth SampathRichard van NeeSantosh AbrahamAlok Aggarwal
    • Hemanth SampathRichard van NeeSantosh AbrahamAlok Aggarwal
    • H04W52/24H04W52/08H04W52/14
    • H04W52/241H04W52/08H04W52/146H04W52/243H04W52/36H04W84/12Y02D70/00
    • Techniques and apparatus for controlling the transmit power of an uplink (UL) signal from a user terminal in a wireless communications system in an effort to achieve some target characteristic, such as a target carrier-to-interference (C/I) ratio, at an access point (AP) are provided. In this manner, such a user terminal may help avoid or compensate for imbalances in received radio frequency (RF) power between UL signals received from multiple user terminals by the AP. For example, the transmit power at each user terminal may be controlled in an effort to achieve a target post-processing C/I ratio of 28 dB per spatial stream in an effort to reduce large power imbalances and optimize throughput per user terminal. The user terminal and the AP may compose part of a multiple-input multiple-output (MIMO) communication system utilizing spatial-division multiple access (SDMA) techniques.
    • 用于在无线通信系统中用于控制来自用户终端的上行链路(UL)信号的发射功率的技术和装置,以努力实现诸如目标载波干扰(C / I)比等目标特性 提供接入点(AP)。 以这种方式,这样的用户终端可以帮助避免或补偿由AP从多个用户终端接收的UL信号之间的接收射频(RF)功率的不平衡。 例如,可以控制每个用户终端处的发射功率,以努力实现每个空间流28dB的目标后处理C / I比,以减少大的功率不平衡并优化每个用户终端的吞吐量。 用户终端和AP可以利用空分多址(SDMA)技术构成多输入多输出(MIMO)通信系统的一部分。