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    • 4. 发明申请
    • ESTIMATING CLOCK SKEW
    • 估计时钟
    • US20130055007A1
    • 2013-02-28
    • US13463857
    • 2012-05-04
    • Hong Wei DaiGong Qiong LiJia NuiJun Tan
    • Hong Wei DaiGong Qiong LiJia NuiJun Tan
    • G06F1/04
    • G06F17/5068G06F2217/62G06F2217/84
    • The present invention relates to a method and an apparatus for estimating a clock skew. The method comprises: obtaining a basic clock skew of each clock tree in the circuit; judging whether two units are in a same clock domain; if they are in different clock domains, estimating the clock skew between units to be a larger one of basic clock skews of the clock trees corresponding to these two unit; if these two units are in the same clock domain, further judging whether they are in a same hierarchical logic block; if they are in different hierarchical logic blocks, estimating the clock skew between units to be the basic clock skew of the clock tree of these two units plus additional clock skew caused by different hierarchical logic blocks. The apparatus is corresponding to the method. With the method and apparatus, the clock skew in the circuit can be estimated more accurately, which improves the efficiency of circuit design.
    • 本发明涉及一种用于估计时钟偏差的方法和装置。 该方法包括:获得电路中每个时钟树的基本时钟偏差; 判断两个单元是否处于相同的时钟域; 如果它们在不同的时钟域中,则将单元之间的时钟偏差估计为对应于这两个单元的时钟树的基本时钟偏差中较大的一个; 如果这两个单元在相同的时钟域中,则进一步判断它们是否处于相同的分层逻辑块中; 如果它们处于不同的分层逻辑块中,则估计单元之间的时钟偏差将成为这两个单元的时钟树的基本时钟偏差,以及由不同分层逻辑块引起的附加时钟偏移。 该装置对应于该方法。 利用该方法和装置,可以更精确地估计电路中的时钟偏移,这提高了电路设计的效率。
    • 7. 发明申请
    • Real-time retry limit-a system and method to maximize throughput and minimize packet loss of wireless local area networks
    • 实时重试限制 - 最大化吞吐量并最大限度地减少无线局域网丢包的系统和方法
    • US20060262718A1
    • 2006-11-23
    • US10547714
    • 2003-09-01
    • Qiong LiMihaela van der Schaar
    • Qiong LiMihaela van der Schaar
    • H04L12/26
    • H04L47/10H04L1/0015H04L1/1825H04L1/1887H04L47/11H04L47/14H04L47/2416H04W24/00H04W28/14H04W28/18H04W84/12
    • This invention provides a system and method to dynamically adapt a wireless link retry limit in real-time according to channel conditions and workload intensity in order to maximize MAC throughput and minimize packet loss. In wireless local area networks (WLANs), such as IEEE 802.11b or a, packets can get lost due to either link error or interface queue overflow. Retry is deployed by a wireless link as a link error protection mechanism to reduce packet loss due to link error. However, an improper configuration of this retry limit (such as too high) may cause more packet loss due to queue overflow than link error. The retry-limit adaptation system and method of this invention strikes a balance between queue drops and link losses. Consequently, it achieves much better network performance in terms of a significant reduction of overall packet loss when compared with situations where the retry limit is statically configured, as recommended by the current standard. For video applications, this dynamic adaptation can be configured in such a way that the video quality for a particular network condition is optimized.
    • 本发明提供一种根据信道条件和工作负载强度实时动态地适应无线链路重试限制的系统和方法,以便最大化MAC吞吐量并最小化分组丢失。 在诸如IEEE 802.11b或a之类的无线局域网(WLAN)中,由于链路错误或接口队列溢出,数据包可能会丢失。 重试由无线链路部署为链路错误保护机制,以减少链路错误引起的丢包。 但是,由于队列溢出而导致的重试限制(如太高)的配置不正确会导致链路错误导致更多的丢包。 本发明的重试限制适配系统和方法在队列丢弃和链路丢失之间达成平衡。 因此,根据当前标准的推荐,与静态配置重试限制的情况相比,在整体分组丢失显着减少方面,实现了更好的网络性能。 对于视频应用,可以以这样的方式配置该动态适配,使得针对特定网络条件的视频质量被优化。