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    • 7. 发明申请
    • IMPROVED VERTICAL ROAMING IN WIRELESS NETWORKS THROUGH IMPROVED WIRELESS NETWORK CELL BOUNDARY DETECTION
    • 通过改进的无线网络小区边界检测改善无线网络中的垂直漫游
    • WO2004079968A2
    • 2004-09-16
    • PCT/US2004002501
    • 2004-01-29
    • MICROSOFT CORPGUO ZIHUAZHANG QIANYAO RICHARDZHU WENWU
    • GUO ZIHUAZHANG QIANYAO RICHARDZHU WENWU
    • H04B7/212H04B7/26H04J3/16H04J7/00H04J11/00H04L20060101H04L12/28H04W36/14H04W36/30H04L
    • H04W36/30H04B2201/70702
    • A system and method for improved vertical handoff between different types of wireless network. Network allocation vector occupation and packet collision probability are used as quality of service measures, enabling vertical handoffs to be delayed until actually beneficial to quality of service. Improved wireless network cell boundary detection in vertical handoff scenarios is achieved with a Fourier-based technique in conjunction with an adaptively determined minimum operating signal strength threshold. Improved wireless network cell boundary detection enables vertical handoffs from high quality of service networks to be delayed as long as possible. Together, practical wireless network quality of service measures and improved detection of wireless network cell boundaries in vertical handoff scenarios reduce the rate of unnecessary vertical handoff resulting in higher overall quality of service experienced by a mobile computing device roaming between wireless network types.
    • 一种用于改善不同类型无线网络之间的垂直切换的系统和方法。 网络分配向量占用和分组冲突概率被用作服务质量度量,使得垂直切换被延迟,直到实际上有益于服务质量。 利用基于傅里叶的技术结合自适应确定的最小操作信号强度阈值来实现垂直切换场景中改进的无线网孔单元边界检测。 改进的无线网络小区边界检测能够使来自高质量服务网络的垂直切换尽可能延迟。 总而言之,在垂直切换场景中实际的无线网络服务质量测量和无线网络小区边界的改进检测降低了不必要的垂直切换的速率,从而导致无线网络类型之间漫游的移动计算设备所经历的更高的整体服务质量。
    • 10. 发明申请
    • QUALITY OF SERVICE DIFFERENTIATION IN WIRELESS NETWORKS
    • 无线网络中服务质量差异的质量
    • WO2004077225A3
    • 2005-04-21
    • PCT/US2004002513
    • 2004-01-29
    • MICROSOFT CORPGUO ZIHUAZHU WENWUZHANG QIANZHAO JUN
    • GUO ZIHUAZHU WENWUZHANG QIANZHAO JUN
    • H04L12/28H04L12/56H04W28/18H04W28/24H04W74/00H04W74/08H04Q7/24
    • H04W74/0816H04W28/18H04W28/24H04W74/006H04W74/0833
    • A method provides differentiated quality of service (QoS) by providing adaptive updates to media access control (MAC) layer parameters on a distributed basis. The method includes calculating a failure probability for a transmission over the network, determining a target value for determining a contention window according to a mapped function of the failure probability, and altering the contention window according to a scaling function of the target value. The mapped function and the scaling can provide QoS differentiation. A wireless device ensures fairness in a wireless time slotted network and includes a network interface card (NIC), a network driver interface, a network monitor, a statistics engine, and an adaptive parameter engine for determining a target value for determining a contention window according to a mapped function of the one or more probabilities to enable an alteration of the contention window and provide new parameters for the MAC layer.
    • 一种方法通过在分布式的基础上提供媒体访问控制(MAC)层参数的适应性更新来提供差异化​​的服务质量(QoS)。 该方法包括:计算网络传输的故障概率,根据故障概率的映射函数确定确定竞争窗口的目标值,并根据目标值的缩放函数改变争用窗口。 映射函数和缩放可以提供QoS差异化。 无线设备确保在无线时隙网络中的公平性,并且包括网络接口卡(NIC),网络驱动器接口,网络监视器,统计引擎和用于确定用于确定争用窗口的目标值的自适应参数引擎, 涉及一个或多个概率的映射函数,以便能够改变争用窗口并为MAC层提供新的参数。