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    • 3. 发明授权
    • Fair rate allocation on an IEEE 802.11e communication medium
    • 在IEEE 802.11e通信介质上的公平速率分配
    • US07756089B2
    • 2010-07-13
    • US10570538
    • 2004-08-23
    • Chun Ting ChouSai Shankar NandagopalanJavier Del Prado Pavon
    • Chun Ting ChouSai Shankar NandagopalanJavier Del Prado Pavon
    • H04J3/00
    • H04W74/0816H04W28/10H04W74/08H04W84/12
    • Wireless stations (108-1-108-N) contending for exclusive access for a predetermined period of time (S232) to transmit on a communication medium (112) are regulated by a common external controller (104) using a single timing parameter (S204). Attempts at transmission access are preceded by respective delays that are expired simultaneously and at a common rate by the stations at times when the stations sense the medium to be idle (S224). The delays are pseudo-randomly selected to avoid collisions among stations in their respective access attempts (S208). Default, initial values of the respective delays (S204) applied to the stations, when multiplied by the respective expected number of transmission attempts by the stations over the long term over periods of time when no transmission attempt is unsuccessful, yield respective products equal to a constant value common to all stations (S312). The default values therefore serve as a knob by which the controller regulates air time opportunity.
    • 在通信介质(112)上进行发送的在预定时间段(S232)中进行专用访问的无线站(108-1-108-N)由公共外部控制器(104)使用单个定时参数来调节(S204 )。 在发送接入的尝试之前是在站感测媒体空闲的时刻(S224)的同时到达的各个延迟以及站的共同速率。 延迟是伪随机选择的,以避免各个接入尝试中的站之间的冲突(S208)。 默认情况下,应用于站的各个延迟的初始值(S204)当乘以在不发送尝试不成功的时间段内长时间站的相应预期发送次数时,产生等于 所有站通用的常数值(S312)。 因此,默认值用作控制器调节空气时间机会的旋钮。
    • 7. 发明授权
    • Overlapping network allocation vector (ONAV) for avoiding collision in the IEEE 802.11 WLAN operating under HCF
    • 用于避免在HCF下运行的IEEE 802.11 WLAN中发生冲突的重叠网络分配向量(ONAV)
    • US07164671B2
    • 2007-01-16
    • US10029825
    • 2001-12-27
    • Javier del PradoSunghyun ChoiAmjad Ali Soomro
    • Javier del PradoSunghyun ChoiAmjad Ali Soomro
    • H04Q7/24H04L12/43H04J3/02
    • H04W16/14H04W74/0816
    • The present invention is related to a medium access control (MAC) protocol for avoiding collisions among ESTAs when two or more overlapping basic service sets (OBSSs) co-exist and operate in the same channel. To achieve this, each mobile station operating under HCF maintains a first counter known as Network Allocation Vector (NAV) and a second counter known as Overlapping Network Allocation Vector (ONAV), which is updated within a mobile station by frames coming from OBSSs, during the Contention Free Period (CFP) or during a Contention Free Burst (CFB) granted by a polling frame. The mobile station uses the NAV to update only to the medium occupancy in its own BSS to ensure that the mobile station will not interfere with the transmissions in its own QBSS, while the ONAV is used to avoid collisions with the mobile stations from the OBSS.
    • 本发明涉及当两个或多个重叠的基本业务集(OBSS)共存并且在同一信道中操作时,用于避免ESTAs之间的冲突的介质访问控制(MAC)协议。 为了实现这一点,在HCF下运行的每个移动台维护着称为网络分配向量(NAV)的第一计数器和称为重叠网络分配向量(ONAV)的第二计数器,其在移动站内通过来自OBSS的帧来更新 竞争自由期(CFP)或竞争性自由突发(CFB)期间投票。 移动台使用NAV来仅更新自己的BSS中的媒体占用,以确保移动台不会干扰自己的QBSS中的传输,而ONAV被用于避免与OBSS的移动台冲突。