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    • 3. 发明公开
    • CONTENTION WINDOW VALUE ADAPTIVE ADJUSTING METHOD AND EQUIPMENT
    • VERFAHREN UND VORRICHTUNG ZUR ADAPTIVEN EINSTELLUNG EINES ZUFRIEDENHEITSFENSTERWERTES
    • EP2894928A4
    • 2015-09-16
    • EP13835072
    • 2013-08-23
    • ZTE CORP
    • LIU XIANGFENG
    • H04W74/08
    • H04W74/085H04W24/08H04W28/044H04W84/12
    • A method and device for adjusting contention window value adaptively are disclosed. The method comprises the following steps: the number n of stations participated in a contention currently is measured; according to the number n of stations participated in the contention currently, a practical collision probability P c of a current contention window value CW old and optimal collision probability P copt under the maximum network throughput are acquired; when a data frame is sent successfully, an initial contention window value CW init is adjusted according to the practical collision probability P c and optimal collision probability P copt ; when a data frame is sent unsuccessfully, a retransmission contention window value CW new is adjusted according to said practical collision probability P c . The above solution can better reflect network collision situation, adaptively adjust an initial contention window value and retransmission contention window value jointly, thus making the contention window value finally approaching to an optimal value, improving the network throughout, and reducing the delay.
    • 公开了一种用于自适应地调整争用窗口值的方法和装置。 该方法包括以下步骤:目前参与竞争的车站数量n; 根据当前参与竞争的车站数量n,获取当前竞争窗口值CW的最佳碰撞概率P c和最大网络吞吐量下的最优碰撞概率P copt; 当成功发送数据帧时,根据实际冲突概率P c和最优碰撞概率P copt调整初始争用窗口值CW init; 当数据帧不成功发送时,根据所述实际冲突概率P c来调整重传竞争窗口值CW new。 上述解决方案可以更好地反映网络冲突情况,联合自适应调整初始争用窗口值和重传竞争窗口值,从而使竞争窗口值最终接近最优值,改善网络整体,减少延迟。
    • 4. 发明公开
    • WIRELESS LAN COMMUNICATION DEVICE, WIRELESS LAN COMMUNICATION METHOD AND PROGRAM
    • 无线局域网通信设备,无线局域网通信方法和程序
    • EP2685776A1
    • 2014-01-15
    • EP12755766.8
    • 2012-02-02
    • NEC CASIO Mobile Communications, Ltd.
    • OKUYAMA, Mariko
    • H04W74/08H04W84/12
    • H04W28/044H04W28/18H04W72/12H04W74/085H04W74/0875H04W84/12
    • [PROBLEM TO BE SOLVED] Even when a mass of traffic exists in categories having the priority of the same class, the collision of packets in the traffic, the increase of the amount of delay, the reduction of throughput, and the like can be avoided.
      [SOLUTION] A wireless LAN communication device (100) configured to carry out the priority control of an EDCA scheme includes a first determining means (101) for determining access categories, a second determining means (102) for determining a bandwidth occupancy rate for each access category, and a change means (103) for dynamically changing parameters regarding the priority control for each category in accordance with determination results of the first determining means (101) and the second determining means (102). Preferably, in a case where there are a plurality of categories, when the bandwidth occupancy rate is equal to or higher than a first bandwidth occupancy rate, the change means (103) executes a first optimization, and in contrast, when the bandwidth occupancy rate is equal to or lower than the first bandwidth occupancy rate and equal to or higher than a second bandwidth occupancy rate, the change means (103) executes a second optimization, and the change means (103) temporarily increases, at least, a CWmin and a CWmax of the parameters regarding the priority control only by a predetermined value (α) in the first optimization and the second optimization.
    • [即将解决的问题]即使当具有相同类别的优先级的类别中存在大量业务时,也可以避免业​​务中的分组冲突,延迟量的增加,吞吐量的降低等 。 用于执行EDCA方案的优先级控制的无线LAN通信设备(100)包括:第一确定装置(101),用于确定接入种类;第二确定装置(102),用于确定每个接入种类的带宽占用率 访问类别,以及根据第一确定装置(101)和第二确定装置(102)的确定结果动态地改变关于每个类别的优先级控制的参数的改变装置(103)。 优选地,在存在多个类别的情况下,当带宽占有率等于或高于第一带宽占有率时,改变装置(103)执行第一优化,相反,当带宽占有率 在第一带宽占有率以下且第二带宽占有率以上的情况下,变更单元(103)进行第二最优化,变更单元(103)至少暂时增加CWmin和 在第一优化和第二优化中,关于优先控制的参数的CWmax仅由预定值(α)决定。
    • 7. 发明授权
    • WIRELESS LAN COMMUNICATION DEVICE, WIRELESS LAN COMMUNICATION METHOD AND PROGRAM
    • 无线局域网通信设备,无线局域网通信方法和程序
    • EP2685776B1
    • 2017-08-16
    • EP12755766.8
    • 2012-02-02
    • NEC Corporation
    • OKUYAMA, Mariko
    • H04W28/04H04W74/08H04W28/18H04W28/12H04W84/12H04W72/12
    • H04W28/044H04W28/18H04W72/12H04W74/085H04W74/0875H04W84/12
    • [PROBLEM TO BE SOLVED] Even when a mass of traffic exists in categories having the priority of the same class, the collision of packets in the traffic, the increase of the amount of delay, the reduction of throughput, and the like can be avoided. [SOLUTION] A wireless LAN communication device (100) configured to carry out the priority control of an EDCA scheme includes a first determining means (101) for determining access categories, a second determining means (102) for determining a bandwidth occupancy rate for each access category, and a change means (103) for dynamically changing parameters regarding the priority control for each category in accordance with determination results of the first determining means (101) and the second determining means (102). Preferably, in a case where there are a plurality of categories, when the bandwidth occupancy rate is equal to or higher than a first bandwidth occupancy rate, the change means (103) executes a first optimization, and in contrast, when the bandwidth occupancy rate is equal to or lower than the first bandwidth occupancy rate and equal to or higher than a second bandwidth occupancy rate, the change means (103) executes a second optimization, and the change means (103) temporarily increases, at least, a CWmin and a CWmax of the parameters regarding the priority control only by a predetermined value (±) in the first optimization and the second optimization.
    • [即将解决的问题]即使当具有相同类别的优先级的类别中存在大量业务时,也可以避免业​​务中的分组冲突,延迟量的增加,吞吐量的降低等 。 用于执行EDCA方案的优先级控制的无线LAN通信设备(100)包括:第一确定装置(101),用于确定接入种类;第二确定装置(102),用于确定每个接入种类的带宽占用率 访问类别,以及根据第一确定装置(101)和第二确定装置(102)的确定结果动态地改变关于每个类别的优先级控制的参数的改变装置(103)。 优选地,在存在多个类别的情况下,当带宽占有率等于或高于第一带宽占有率时,改变装置(103)执行第一优化,相反,当带宽占有率 在第一带宽占有率以下且第二带宽占有率以上的情况下,变更单元(103)进行第二最优化,变更单元(103)至少暂时增加CWmin和 在第一优化和第二优化中,关于优先级控制的参数的CWmax仅仅是预定值(±)。