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    • 2. 发明申请
    • SYNCHRONISATION METHOD
    • 同步方法
    • WO2009024945A3
    • 2009-04-30
    • PCT/IB2008053361
    • 2008-08-21
    • PHILIPS INTELLECTUAL PROPERTYKONINKL PHILIPS ELECTRONICS NVREUMERMAN HANS-JUERGENZANG YUNPENGSTIBOR LOTHARWALKE BERNHARD
    • REUMERMAN HANS-JUERGENZANG YUNPENGSTIBOR LOTHARWALKE BERNHARD
    • H04J3/06H04W56/00
    • H04J3/0641H04J3/0644
    • The present invention relates to a method of synchronising a first communication device with a second communication device in a radio communication system, where the first and second communication devices comprise local clocks for obtaining local time signals. In the method the first communication device first receives (509) periodically a beacon signal from the second communication device, the beacon signal comprising a time signal of the second communication device and the quality of the time signal. Then the first communication device determines (512) quality of the local clock time signal of the first communication device, and determines (513) whether the received time signal is of higher quality than the local time signal of the first communication device, and in case the received time signal is of higher quality, then corrects the accuracy of the local clock of the first communication device.
    • 本发明涉及一种在无线电通信系统中使第一通信设备与第二通信设备同步的方法,其中第一和第二通信设备包括用于获得本地时间信号的本地时钟。 在该方法中,第一通信设备首先周期性地从第二通信设备接收(509)信标信号,信标信号包括第二通信设备的时间信号和时间信号的质量。 然后,第一通信设备确定(512)第一通信设备的本地时钟时间信号的质量,并且确定(513)接收到的时间信号是否具有比第一通信设备的本地时间信号更高的质量,并且在情况 接收到的时间信号质量较高,然后校正第一通信设备本地时钟的准确度。
    • 3. 发明申请
    • CONGESTION CONTROL
    • 约束控制
    • WO2009074949A2
    • 2009-06-18
    • PCT/IB2008055155
    • 2008-12-09
    • PHILIPS INTELLECTUAL PROPERTYKONINKL PHILIPS ELECTRONICS NVREUMERMAN HANS-JUEERGENHIERTZ GUIDO ROLANDZANG YUNPENGMAX GUSTAF SEBASTIANSTIBOR LOTHARWALKE BERNHARD
    • REUMERMAN HANS-JUEERGENHIERTZ GUIDO ROLANDZANG YUNPENGMAX GUSTAF SEBASTIANSTIBOR LOTHARWALKE BERNHARD
    • H04L12/4135H04L47/10H04L47/14H04L47/2408H04W74/0875
    • The present invention relates to a congestion control method for a communication system supporting layered radio channel structure for communication between at least a first communication device and a second communication device, the layered structure comprising at least a physical layer and a medium access layer. The communication system is arranged to offer a first type of service with a first priority order and a second type of service with a second priority order, in the communication system messages comprising a preamble and a payload can be transmitted between devices, each message being separated by at least a period corresponding to a minimum allowable period between two messages. In the method the first communication device first (a) generates (301) a physical layer message pertaining to the first type of service; (b) senses (303) the radio channel idle for at least a period corresponding to the minimum allowable period between two messages; and (c) transmits (305) the physical layer message comprising a special preamble indicative of the type of service the message pertains, wherein the content of the preamble is arranged to be detected by the second communication device within a communication range irrespective of the decoding state of the payload of the transmitted message.
    • 本发明涉及一种用于支持分层无线电信道结构的通信系统的拥塞控制方法,用于至少第一通信设备和第二通信设备之间的通信,所述分层结构至少包括物理层和介质接入层。 通信系统被布置为提供具有第一优先级顺序的第一类型的服务和具有第二优先级顺序的第二类型的服务,在包括前导码的通信系统消息和有效载荷可以在设备之间传送,每个消息被分离 至少一个对应于两个消息之间的最小允许周期的周期。 在该方法中,第一通信设备首先(a)生成(301)与第一类型的服务有关的物理层消息; (b)感测(303)无线电信道空闲至少一个与两个消息之间的最小允许周期相对应的周期; 以及(c)发送(305)包括指示消息所属的服务类型的特殊前导的物理层消息,其中前导码的内容被布置成由通信范围内的第二通信设备在与解码 发送消息的有效载荷的状态。
    • 4. 发明申请
    • WIRELESS SYSTEM CONTAINING A FIRST NETWORK AND A SECOND NETWORK
    • 包含第一个网络和第二个网络的无线系统
    • WO0241586A2
    • 2002-05-23
    • PCT/EP0113331
    • 2001-11-15
    • KONINKL PHILIPS ELECTRONICS NVPHILIPS CORP INTELLECTUAL PTYMANGOLD STEFANWALKE BERNHARDBUDDE WOLFGANG OHABETHA JOERG
    • MANGOLD STEFANWALKE BERNHARDBUDDE WOLFGANG OHABETHA JOERG
    • H04L12/28
    • H04W28/18H04W48/08H04W74/02H04W84/12
    • The invention defines a combined and harmonized protocol for wireless LANs based on the combination of ETSI BRAN HiperLAN/2 protocols with IEEE 802.11a protocols. The new HipeLAN/2 enhanced AP (H/2eAP) will -in addition to its standard HiperLAN/2 operation- also work as Point Coordinator of 802.11a, or is supported by a cooperative Point Coordinator of 802.11. The H/2eAP sends a corporate beacon at the H/2 Target Beacon Transmission Time (H/2 TBTT) with setting the CfpDurRemaining parameter to (a multiple of) 2ms. Upon receiving this beacon by stations of the 802.11a BSS, the stations recognize it as a foreign BSS beacon, extract and evaluate the CfpDurRemaining parameter and thus set timers to the appropriate duration, not to initiate any data transmission during the respective time. After sending this beacon the H/2eAP is able to initiate the transmission of its H/2 MAC frame without underlying interference from the neighbor 802.11a system and without delay of the initial H/2 corporate beacon. The H/2 MAC frame will be embedded in the 802.11 Contention Period (CP) right after the Contention Free Period (CFP). Because the CP before the H/2 MAC frame is either controlled by the H/2eAP or by a cooperative PC, it can be guaranteed that there is no delay of the H/2 corporate beacon transmission. As a result, QoS in H/2 can be supported. The resulting time sequence can be divided into three parts, (1) the "802.11e CFP" with limited Quality of Service, (2) the "HiperLAN/2 MAC" frame with full support of Quality of Service, and (3) the 802.11e CP without any Quality of Service support. All three parts together form the so-called corporate superframe, which is periodically repeated in time.
    • 本发明基于ETSI BRAN HiperLAN / 2协议与IEEE 802.11a协议的组合,定义了用于无线LAN的组合和协调协议。 除了标准的HiperLAN / 2操作之外,新的HipeLAN / 2增强型AP(H / 2eAP)也将作为802.11a的点协调器工作,或者由802.11的协调点协调器支持。 H / 2eAP以H / 2目标信标传输时间(H / 2 TBTT)发送公司信标,并将CfpDurRemaining参数设置为(2ms的倍数)。 在通过802.11a BSS的站接收到该信标时,站将其识别为外部BSS信标,提取并评估CfpDurRemaining参数,从而将定时器设置到适当的持续时间,而不是在相应时间期间启动任何数据传输。 在发送该信标之后,H / 2eAP能够发起其H / 2 MAC帧的传输,而没有来自相邻802.11a系统的基础干扰,并且没有延迟初始H / 2公司信标。 无限周期(CFP)后,H / 2 MAC帧将嵌入802.11竞争时段(CP)。 由于H / 2 MAC帧之前的CP由H / 2eAP或协作PC控制,所以可以保证不存在H / 2公司信标传输的延迟。 因此,可以支持H / 2中的QoS。 所得到的时间序列可以分为三部分:(1)具有有限服务质量的“802.11e CFP”,(2)完全支持服务质量的“HiperLAN / 2 MAC”帧,以及(3) 802.11e CP没有任何服务质量支持。 所有这三个部分组合在一起形成所谓的公司超帧,并且定期重复。