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    • 6. 发明申请
    • PACKET RADIO SYSTEM, AND A TERMINAL EQUIPMENT FOR A PACKET RADIO SYSTEM
    • 分组无线电系统和用于分组无线电系统的终端设备
    • WO9621984A2
    • 1996-07-18
    • PCT/FI9600020
    • 1996-01-08
    • NOKIA TELECOMMUNICATIONS OYHAEMAELAEINEN JARIKARI HANNU HKARPPANEN ARTO
    • HAEMAELAEINEN JARIKARI HANNU HKARPPANEN ARTO
    • H04L12/56H04L29/06H04W76/04H04W88/16H04W92/02
    • H04L69/169H04L29/06H04L69/16H04L69/168H04L2212/00H04W76/04H04W88/16H04W92/02
    • A packet radio system encapsulates data packets of external data networks by a point-to-point protocol PPP (Fig. 4A, 4B), and passes them through one or more sub-networks to a point which supports the protocol of the encapsulated data packet. In addition, a special radio link protocol of the packet radio network is required on the radio interface between a mobile data terminal equipment and a support node. PPP packets are encapsulated in data packets of said radio link protocol. The disadvantage of the arrangement is that the data packets of both the PPP protocol and the radio link protocol contain protocol-specific control fields, which reduces the transmission capacity of user information. Therefore, a PPP packet is compressed (Fig. 4C) before the encapsulation (Fig. 4D) by removing therefrom the unnecessary control fields. After having been transferred over the radio interface, the PPP packet is decompressed into its original format (Fig. 4F, 4G).
    • 分组无线电系统通过点对点协议PPP封装外部数据网络的数据分组(图4A,4B),并将它们通过一个或多个子网络传递到支持封装数据分组协议的点 。 此外,在移动数据终端设备和支持节点之间的无线电接口上需要分组无线电网络的特殊无线电链路协议。 PPP数据包被封装在所述无线电链路协议的数据分组中。 这种安排的缺点是PPP协议和无线链路协议的数据包都包含协议特定的控制字段,这降低了用户信息的传输容量。 因此,通过从其中移除不必要的控制字段,在封装之前(图4C)压缩PPP分组(图4C)。 在通过无线电接口传输之后,PPP数据包被解压缩成其原始格式(图4F,4G)。
    • 8. 发明申请
    • IMPROVING SECURITY OF PACKET-MODE TRANSMISSION IN A MOBILE COMMUNICATION SYSTEM
    • 改进移动通信系统中分组传输的安全性
    • WO1997033403A1
    • 1997-09-12
    • PCT/FI1997000139
    • 1997-03-03
    • NOKIA TELECOMMUNICATIONS OYKARI, HannuKARPPANEN, Arto
    • NOKIA TELECOMMUNICATIONS OY
    • H04L09/14
    • H04L63/0428H04L63/12H04W12/02
    • In General Packet Radio Service GPRS, the data are coded into frames (F) with a given length and comprising a header (1) and a data portion (2). An intruder can interfere with GPRS communication by transmitting unauthorized copies of transmitted messages, or sending false messages and interfere with communication integrity. The reliability of GPRS communication is improved by modifying the frame (F) used on a GPRS connection so that possible extra copies of the frames can be revealed. This can be achieved e.g. by adding an extra information field (3) to the data portion (2) of a GPRS frame (F), the contents of the field being modified between two frames (F). The contents of the extra information field (3) can include the identity of the frame (F), the TLLI of the connection, the IMSI or MSISDN of the mobile station, or an identity formed by an algorithm generating pseudo-random numbers. A second extra information field (4) can be added to the data portion (2) of the frame (F), the field being preferably formed by a different algorithm than the first extra information field (3).
    • 在通用分组无线业务GPRS中,数据被编码成具有给定长度的帧(F),并且包括报头(1)和数据部分(2)。 入侵者可以通过发送未经授权的传输消息副本或发送错误消息并干扰通信完整性来干扰GPRS通信。 通过修改在GPRS连接上使用的帧(F)来改善GPRS通信的可靠性,使得可以显示可能的额外副本。 这可以实现例如。 通过向GPRS帧(F)的数据部分(2)添加额外的信息字段(3),该字段的内容在两帧(F)之间被修改。 附加信息字段(3)的内容可以包括帧(F)的身份,连接的TLLI,移动台的IMSI或MSISDN,或由产生伪随机数的算法形成的身份。 可以将第二额外信息字段(4)添加到帧(F)的数据部分(2),该字段优选地由与第一附加信息字段(3)不同的算法形成。