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    Communication methods and apparatus for controlling the transmission timing of a wireless transceiver
    2.
    发明公开
    Communication methods and apparatus for controlling the transmission timing of a wireless transceiver 有权
    方法和装置Steurerung的无线收发器的传输时间

    公开(公告)号：EP1035667A3

    公开(公告)日：2003-05-28

    申请号：EP99309030.7

    申请日：1999-11-12

    Applicant: Inmarsat Ltd.

    Inventor： Febvre, Paul ,  Mudge, David Denis ,  Jones, Edward Arthur ,  Fines, Panagiotis

    IPC: H04B7/212 ,  H04B7/26

    CPC classification number: H04W56/0045 ,  H04B7/2125 ,  H04B7/2643 ,  H04J3/0682 ,  H04W56/0085

    Abstract: In a wireless communications system, transceivers transmit short bursts to a base station, which determines timing corrections from the time of receipt of the burst and transmits the timing corrections to the respective transceivers. In one aspect, the base station indicates to the transceivers a plurality of time slots, each transceiver selects one of the time slots at random, formats a burst including an indicator of the selected time slot and transmits the burst in that slot. In another aspect, the base station transmits to each transceiver a timing uncertainty value, which determines how the timing correction will be modified by the tranceiver as the interval since last receiving a timing correction increases. Data bursts are transmitted in a format comprising a first unique word, a content field and a second unique word, in that order. The bursts are transmitted in a TDMA channel format which can accommodate both short and long bursts in a block format of constant periodicity.

    Communication methods and apparatus for controlling the transmission timing of a wireless transceiver
    3.
    发明公开
    Communication methods and apparatus for controlling the transmission timing of a wireless transceiver 有权
    方法和装置Steurerung的无线收发器的传输时间

    公开(公告)号：EP1035667A2

    公开(公告)日：2000-09-13

    申请号：EP99309030.7

    申请日：1999-11-12

    Applicant: Inmarsat Ltd.

    Inventor： Febvre, Paul ,  Mudge, David Denis ,  Jones, Edward Arthur ,  Fines, Panagiotis

    IPC: H04B7/26

    CPC classification number: H04W56/0045 ,  H04B7/2125 ,  H04B7/2643 ,  H04J3/0682 ,  H04W56/0085

    Abstract: In a wireless communications system, transceivers transmit short bursts to a base station, which determines timing corrections from the time of receipt of the burst and transmits the timing corrections to the respective transceivers. In one aspect, the base station indicates to the transceivers a plurality of time slots, each transceiver selects one of the time slots at random, formats a burst including an indicator of the selected time slot and transmits the burst in that slot. In another aspect, the base station transmits to each transceiver a timing uncertainty value, which determines how the timing correction will be modified by the tranceiver as the interval since last receiving a timing correction increases. Data bursts are transmitted in a format comprising a first unique word, a content field and a second unique word, in that order. The bursts are transmitted in a TDMA channel format which can accommodate both short and long bursts in a block format of constant periodicity.

    Abstract translation: 在无线通信系统中，收发机发送短脉冲串给基站，其中bestimmt从收到的脉冲串的时间的定时校正和发送定时校正到respectivement收发器。 在一个方面，所述基站指示的收发器的时隙的复数，每个收发信机随机选择的时隙之一，突发格式，包括在所选择的时隙的指示，并发送脉冲串在时隙一样。 在另一个方面中，所述基站发送到每一个收发机的时间不确定性值，其bestimmt如何定时校正将由收发作为间隔自上次接收到定时校正使被修改。 数据脉冲串在一个格式反mitted包括第一唯一字，内容字段和第二唯一字，以该顺序。 的脉冲串是在可以在恒定周期的块格式容纳短和长脉冲串的TDMA信道格式反mitted。

    Convolutional encoder with interleaving
    4.
    发明公开
    Convolutional encoder with interleaving 失效
    卷积编码器与嵌套

    公开(公告)号：EP1420518A3

    公开(公告)日：2004-09-29

    申请号：EP04000755.1

    申请日：1998-04-02

    Applicant: Inmarsat Ltd.

    Inventor： Jones, Edward Arthur ,  Fines, Panagiotis

    IPC: H03M13/23 ,  H03M13/27 ,  H03M13/29

    CPC classification number: H04W68/00 ,  H03M13/23 ,  H03M13/271 ,  H03M13/2732 ,  H03M13/276 ,  H03M13/2789 ,  H04L1/0045 ,  H04L1/0059 ,  H04L1/0071 ,  H04L1/1685 ,  H04L1/1854 ,  H04W16/14 ,  H04W24/00 ,  H04W72/02 ,  H04W72/0406 ,  H04W74/04 ,  H04W74/08 ,  H04W84/025 ,  H04W84/06

    Abstract: A radio frequency paging service has one or more TDMA return channels (R) in which terminals (14) acknowledge receipt of messages having an acknowledge flag set. In one alternative, slots are allocated in the return channel (R) by a slot allocation field in the respective messages. In another alternative, each terminal (14) monitors the messages addressed to other terminals (14) to determine which of them require a response, and determines, from the order of a message addressed to itself among the messages requiring a response, which slot to use for acknowledgement. The TDMA return channels (R) include unreserved slots which terminals (14) access on a contention basis. The frequencies of transmissions in the slots are randomized within a predefined limit to reduce the probability of interference between different terminals (14) in the same unreserved slot. The predefined limit is based on the maximum differential Doppler shift between terminals (14). The return channels (R) are allocated as a continuous block of frequency channels, thereby reducing signalling overhead when allocating these channels, and allowing the block of channels to be decoded by a single DSP. Data bursts transmitted by the terminals (14) in the return channels (R) are half-rate convolutionally encoded and interleaved so that the transmitted bit sequence contains alternating bits from the two outputs of the half-rate encoder. Each terminal (14) is identified by a forward identity code in received messages and by a return identity code in transmitted messages, the identity codes being related by a predetermined algorithm.

    Convolutional encoder with interleaving
    5.
    发明公开
    Convolutional encoder with interleaving 失效
    Konvolutionskodierer mit Verschachtelung

    公开(公告)号：EP1420518A2

    公开(公告)日：2004-05-19

    申请号：EP04000755.1

    申请日：1998-04-02

    Applicant: Inmarsat Ltd.

    Inventor： Jones, Edward Arthur ,  Fines, Panagiotis

    IPC: H03M13/23 ,  H03M13/27 ,  H03M13/29

    CPC classification number: H04W68/00 ,  H03M13/23 ,  H03M13/271 ,  H03M13/2732 ,  H03M13/276 ,  H03M13/2789 ,  H04L1/0045 ,  H04L1/0059 ,  H04L1/0071 ,  H04L1/1685 ,  H04L1/1854 ,  H04W16/14 ,  H04W24/00 ,  H04W72/02 ,  H04W72/0406 ,  H04W74/04 ,  H04W74/08 ,  H04W84/025 ,  H04W84/06

    Abstract: A radio frequency paging service has one or more TDMA return channels (R) in which terminals (14) acknowledge receipt of messages having an acknowledge flag set. In one alternative, slots are allocated in the return channel (R) by a slot allocation field in the respective messages. In another alternative, each terminal (14) monitors the messages addressed to other terminals (14) to determine which of them require a response, and determines, from the order of a message addressed to itself among the messages requiring a response, which slot to use for acknowledgement. The TDMA return channels (R) include unreserved slots which terminals (14) access on a contention basis. The frequencies of transmissions in the slots are randomized within a predefined limit to reduce the probability of interference between different terminals (14) in the same unreserved slot. The predefined limit is based on the maximum differential Doppler shift between terminals (14). The return channels (R) are allocated as a continuous block of frequency channels, thereby reducing signalling overhead when allocating these channels, and allowing the block of channels to be decoded by a single DSP.
    Data bursts transmitted by the terminals (14) in the return channels (R) are half-rate convolutionally encoded and interleaved so that the transmitted bit sequence contains alternating bits from the two outputs of the half-rate encoder.
    Each terminal (14) is identified by a forward identity code in received messages and by a return identity code in transmitted messages, the identity codes being related by a predetermined algorithm.

    Abstract translation: 射频寻呼服务具有一个或多个TDMA返回信道（R），其中终端（14）确认接收到具有确认标志的消息。 在一个替代方案中，通过相应消息中的时隙分配字段在返回信道（R）中分配时隙。 在另一替代方案中，每个终端（14）监视寻址到其他终端（14）的消息以确定其中哪一个需要响应，并且从需要响应的消息中的寻址到自身的消息的顺序确定哪个时隙 用于确认。 TDMA返回信道（R）包括终端（14）在争用的基础上访问的未保留时隙。 时隙中的传输频率在预定义的限制内被随机化，以减少同一未保留时隙中的不同终端（14）之间的干扰概率。 预定义的限制基于终端（14）之间的最大差分多普勒频移。 返回信道（R）被分配为连续的频道块，从而在分配这些信道时减少信令开销，并允许单个DSP对信道块进行解码。 由返回信道（R）中的终端（14）发送的数据突发被半速率卷积编码和交织，使得发送的比特序列包含来自半速率编码器的两个输出的交替比特。 每个终端（14）由接收到的消息中的前向身份码和所发送的消息中的返回标识码来标识，所述身份码由预定的算法相关。

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