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    • 9. 发明申请
    • RANDOM MEDIUM ACCESS METHODS WITH BACKOFF ADAPTATION TO TRAFFIC
    • 随机媒体访问方法与后台适应交通
    • WO02054671A3
    • 2003-10-09
    • PCT/US0200480
    • 2002-01-02
    • AT & T CORP
    • BENVENISTE MATHILDE
    • H04L12/28H04L12/413H04L12/56
    • H04W72/1236H04L12/413H04W72/1252H04W74/085H04W74/0875
    • Using low PF values in conjunction with traffic-adapted contention windows leads to substantial decreases in delay and jitter. In general, adaptation to traffic reduces contention or delay: opening up the contention window in congestion and closing it on relief. Residual backoff adaptation provides for the reduction of the already decremented backoff values of stations that interrupted the backoff countdown process due to a transmission. It is good to adapt both the contention window and the residual backoff in order to avoid jitter. Otherwise, if the contention window is reduced but residual backoffs stay unchanged, new arrivals will enjoy shorter backoff delays than older ones, resulting in greater jitter. Adjusting both preserves the relative ordering of backoff counter values, which implies also some form of age ordering. Different adjustments can be applied to different priority traffic.
    • 将低PF值与流量适配争用窗口结合使用会导致延迟和抖动的显着降低。 一般来说,适应流量减少争用或延迟:在拥挤的情况下开放竞争窗口,并将其解除。 剩余回退适应提供减少由于传输而中断倒退倒计时过程的站的已经递减的回退值。 为了避免抖动,适应竞争窗口和剩余退避是很好的。 否则,如果竞争窗口减少但剩余退避保持不变,则新来的人的回退延迟将比旧的延迟更短,导致更大的抖动。 调整两者都保留了退货计数器值的相对顺序,这也意味着某种形式的年龄排序。 不同的调整可以应用于不同的优先流量。
    • 10. 发明申请
    • TIERED CONTENTION MULTIPLE ACCESS (TCMA): A METHOD FOR PRIORITY-BASED SHARED CHANNEL ACCESS
    • 定向连续多路访问(TCMA):一种基于优先级的共享信道访问的方法
    • WO0237754A3
    • 2003-05-01
    • PCT/US0127798
    • 2001-11-02
    • AT & T CORP
    • BENVENISTE MATHILDE
    • H04L12/28H04L12/413H04L12/56H04W16/14H04W56/00H04W74/02H04W74/04H04W84/12H04L29/06
    • H04W72/1242H04L47/10H04L47/14H04L47/2416H04L47/2433H04L47/245H04L47/283H04L47/32H04L47/6275H04W28/0252H04W56/00H04W72/1231H04W74/02H04W84/12
    • Quality of Service (QoS) support is provided by means of a Tiered Contention Multiple Access (TCMA) distributed medium access protocol that schedules transmission of different types of traffic based on their service quality specifications. In one embodiment, a wireless station is supplied with data from a source having a lower QoS priority QoS(A), such as file transfer data. Another wireless station is supplied with data from a source having a higher QoS priority QoS(B), such as voice and video data. Each wireless station can determine the urgency class of its pending packets according to a scheduling algorithm. For example file transfer data is assigned lower urgency class and voice and video data is assigned higher urgency class. There are several urgency classes which indicate the desired ordering. Pending packets in a given urgency class are transmitted before transmitting packets of a lower urgency class by relying on class-differentiated urgency arbitration times (UATs), which are the idle time intervals required before the random backoff counter is decreased. In another embodiment packets are reclassified in real time with a scheduling algorithm that adjusts the class assigned to packets based on observed performance parameters and according to negotiated QoS-based requirements. Further, for packets assigned the same arbitration time, additional differentiation into more urgency classes is achieved in terms of the contention resolution mechanism employed, thus yielding hybrid packet prioritization methods. An Enhanced DCF Parameter Set is contained in a control packet sent by the AP to the associated stations, which contains class differentiated parameter values necessary to support the TCMA. These parameters can be changed based on different algorithms to support call admission and flow control functions and to meet the requirements of service level agreements.
    • 服务质量(QoS)支持通过分层竞争多路访问(TCMA)分布式媒体访问协议来提供,该协议根据其服务质量规范安排不同类型流量的传输。 在一个实施例中,从具有较低QoS优先级QoS(A)的源(例如文件传输数据)向无线站提供数据。 从具有较高QoS优先级QoS(B)的源(例如语音和视频数据)的源提供另一个无线站。 每个无线站可以根据调度算法确定其未决分组的紧急等级。 例如,文件传输数据被分配较低的紧急等级,并且语音和视频数据被分配更高的紧急等级。 有几个紧急级别表示所需的顺序。 在通过依赖类别分类的紧急仲裁时间(UAT),在随机退避计数器减少之前所需的空闲时间间隔的情况下,在发送较低紧急度类别的分组之前,发送给定紧急等级中的等待分组。 在另一个实施例中,分组被实时地重新分类为调度算法,该调度算法基于观察到的性能参数并根据协商的基于QoS的需求来调整分配给分组的类别。 此外,对于分配相同仲裁时间的分组,在所采用的争用解决机制方面实现了更加紧急等级的额外区分,从而产生混合分组优先级方法。 增强的DCF参数集包含在由AP发送到相关站的控制分组中,该组包含支持TCMA所需的类别差分参数值。 这些参数可以根据不同的算法进行更改,以支持呼叫准入和流量控制功能,并满足服务级别协议的要求。