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    • 5. 发明授权
    • Method and arrangement for ciphering information transfer
    • 加密信息传输的方法和布置
    • US06813355B1
    • 2004-11-02
    • US09249475
    • 1999-02-12
    • Markus Hakaste
    • Markus Hakaste
    • H04K100
    • H04L9/0618H04L9/0827H04L9/12H04L2209/805
    • The invention relates to a method and arrangement for ciphering an information transfer connection. The invention can be advantageously applied in a TDMA (Time Division Multiple Access) cellular system offering broadband circuit switched services. An essential idea of the invention is that the information to be ciphered in a transmission burst is divided into at least two blocks (730) and said blocks are ciphered in ways that are not identical with each other (750 to 770). Then the reliability of ciphering is better because the amount of information encoded using one and the same ciphering algorithm and key is smaller. In addition, the reliability of the ciphering can be varied by changing the number and/or size of the information blocks in a burst.
    • 本发明涉及用于加密信息传输连接的方法和装置。 本发明可以有利地应用于提供宽带电路交换服务的TDMA(时分多址)蜂窝系统中。 本发明的一个基本思想是将传输突发中要加密的信息划分为至少两个块(730),并且所述块以彼此不相同的方式进行加密(750至770)。 然后加密的可靠性更好,因为使用一个相同的加密算法和密钥编码的信息量较小。 此外,可以通过改变突发中的信息块的数量和/或尺寸来改变加密的可靠性。
    • 6. 发明授权
    • Asymmetric data transmission for use in a multi-modulation environment
    • 用于多调制环境的非对称数据传输
    • US06377817B1
    • 2002-04-23
    • US09551012
    • 2000-04-18
    • Markus HakasteShkumbin HamitiHarri JokinenEero Nikula
    • Markus HakasteShkumbin HamitiHarri JokinenEero Nikula
    • H04B138
    • H04W28/18H04L1/0003H04L1/0009H04L1/0022H04L1/0038H04L27/0012Y02D70/1222Y02D70/1226
    • A data transmission method and system for circuit switched and other services that can be employed in TDMA-based systems, and that supports the use of one or several types of modulation (e.g., 8-PSK modulation), in addition to a “normal” modulation (e.g., GMSK modulation) on a radio interface. An additional modulation/channel coding (e.g., one based on 8-PSK) may be used in the downlink transmission, while the normal modulation/channel coding (e.g., one based on GMSK) may be used in the uplink transmissions, under a variety of different conditions. A first condition arises where the radio conditions allow the use of the additional modulation in both directions, but the mobile station transmitter does not support it. A second condition arises where the radio conditions allow the use of the additional modulation in both directions, and the mobile station supports it, but the user requests a downlink-biased or uplink-biased data transmission service. A third condition arises where the mobile station supports the use of the additional modulation in both directions, but the uplink (or downlink) radio conditions do not permit the use of the additional modulation (e.g., because of link budget limitations.) Also, a lower data rate may be desired on the uplink in order to reduce the power consumption of the mobile station, and/or in the downlink direction to avoid unnecessary interference. This is especially true in the case that one direction or the other has less data to transmit, and the high speed data transmission mode is not required (even if supported).
    • 一种用于电路交换和其他服务的数据传输方法和系统,其可以在基于TDMA的系统中使用,并且除了“正常”之外还支持使用一种或几种类型的调制(例如,8-PSK调制) 在无线电接口上进行调制(例如,GMSK调制)。 在下行链路传输中可以使用附加的调制/信道编码(例如,基于8-PSK的一个)编码(例如,基于GMSK的正常调制/信道编码)可以在上行链路传输中使用 的不同条件。 出现无线电条件允许在两个方向上使用附加调制的第一个条件,但移动台发射机不支持它。 出现第二个条件,其中无线电条件允许在两个方向上使用附加调制,并且移动台支持它,但是用户请求下行链路偏置或上行链路偏置的数据传输服务。 第三个条件出现在移动台支持在两个方向上使用附加调制,但是上行链路(或下行链路)无线电条件不允许使用附加调制(例如,由于链路预算限制)。另外,一个 为了降低移动台的功率消耗和/或在下行链路方向,为了避免不必要的干扰,在上行链路上可能希望较低的数据速率。 在一个方向或另一方向具有较少的传输数据的情况下尤其如此,并且不需要高速数据传输模式(即使被支持)。