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    • 1. 发明申请
    • METHOD AND DEVICE FOR AUTOMATIC CREATION OF A LOCATION-BASED TALK GROUP CALL WITH REDUCED MESSAGING OVERHEAD
    • 用于自动创建基于位置的群组呼叫的方法和设备,具有减少的消息传递
    • US20140057645A1
    • 2014-02-27
    • US13590318
    • 2012-08-21
    • DIPENDRA M. CHOWDHARYTHOMAS B. BOHNDAVID G. WIATROWSKI
    • DIPENDRA M. CHOWDHARYTHOMAS B. BOHNDAVID G. WIATROWSKI
    • H04W4/02
    • H04W4/021H04L69/22H04W4/08H04W76/40H04W84/08
    • Disclosed is a method of automatic establishment of a location-based talk group call with reduced messaging overhead. The initiating device may be a subscriber unit (SU). The SU determines a geographic reference location and generates location data representative of the location. The SU broadcasts a location-based talk group call header including the location data and including a location-based talk group call identifier field set to cause other SUs receiving the call header to receive and output subsequent data associated with the call header responsive to determining that its current geographic location satisfies the location criterion of the call. The location criterion may be fully determined by the initiating SU and specified in the call header, and may take the form of a specified radius that extends from the geographic reference location represented in the call header.
    • 公开了一种以减少的消息开销自动建立基于位置的通话组呼叫的方法。 发起设备可以是用户单元(SU)。 SU确定地理参考位置并生成表示位置的位置数据。 SU广播包括位置数据的基于位置的通话组呼叫头部,并且包括设置的基于位置的通话组呼叫标识符字段,以使得接收到呼叫头部的其他SU接收并输出与呼叫头部相关联的后续数据,以响应于确定 其当前地理位置满足呼叫的位置标准。 位置标准可以由发起的SU完全确定并在呼叫头部中指定,并且可以采取从呼叫头部中表示的地理参考位置延伸的指定半径的形式。
    • 3. 发明申请
    • METHOD FOR TRUNKING RADIO FREQUENCY RESOURCES
    • 用于无线射频资源的方法
    • US20100087199A1
    • 2010-04-08
    • US12331180
    • 2008-12-09
    • DIPENDRA M. CHOWDHARYDAVID G. WIATROWSKITHOMAS B. BOHN
    • DIPENDRA M. CHOWDHARYDAVID G. WIATROWSKITHOMAS B. BOHN
    • H04W72/00H04B7/14
    • H04W72/005H04W4/10H04W24/00H04W72/00H04W76/10H04W76/45H04W84/047
    • A subscriber unit monitors a first channel currently serving as a rest channel for the system, wherein the channel currently serving as the rest channel for the system is monitored by subscribers that are idle in the system. The subscriber unit determines that a first call is being initiated on the first channel. If the first call is not of interest, the subscriber unit ceases to monitor the first channel, and monitors a second channel that will serve as the rest channel for the system when the first call starts on the first channel. If the first call is of interest, the subscriber unit participates in the first call on the first channel, and before or after the first call ends, participates in a second call on a third channel or monitors a channel currently serving as the rest channel for the system when the subscriber unit becomes idle.
    • 用户单元监视当前用作系统的休息信道的第一信道,其中当前用作系统的休息信道的信道由系统中空闲的用户监视。 订户单元确定在第一信道上正在启动第一呼叫。 如果第一呼叫不感兴趣,则当第一呼叫在第一信道上开始时,用户单元停止监视第一信道,并且监视将用作系统的休息信道的第二信道。 如果第一呼叫是感兴趣的,则用户单元参与第一信道上的第一呼叫,并且在第一呼叫结束之前或之后,在第三信道上参与第二呼叫或监视当前用作休息信道的信道, 系统当用户单元变空时。
    • 4. 发明申请
    • METHOD AND APPARATUS FOR CONFIRMING DELIVERY OF GROUP DATA TO RADIO COMMUNICATION DEVICES IN A WIRELESS COMMUNICATION SYSTEM
    • 确定无线通信系统中无线电通信设备的组数据传送方法和装置
    • US20130322414A1
    • 2013-12-05
    • US13485125
    • 2012-05-31
    • DIPENDRA M. CHOWDHARYTHOMAS B. BOHNDAVID G. WIATROWSKI
    • DIPENDRA M. CHOWDHARYTHOMAS B. BOHNDAVID G. WIATROWSKI
    • H04B7/212H04W72/04H04J3/00
    • H04W4/08H04L51/30H04L51/38
    • A method and apparatus for confirming delivery of group data to a plurality of radio communication devices in a wireless communication system. The wireless communication system includes a plurality of radio communication devices in communication with a sender. In operation, the sender sends group data to the plurality of radio communication devices and further determines a call hang time sufficient to contain a dedicated acknowledgment slot for each of the plurality of radio communication devices. The sender reserves an acknowledgment slot in the determined call hang time for each radio communication device and further sends an acknowledgment polling signal to each radio communication device, where the acknowledgment polling signal identifies the respective acknowledgment slot that is reserved for each radio communication device to acknowledge receipt of the group data. The sender accordingly receives an acknowledgment from the radio communication devices during its respective reserved acknowledgment slot.
    • 一种在无线通信系统中确认向多个无线电通信设备传送组数据的方法和设备。 无线通信系统包括与发送者通信的多个无线电通信设备。 在操作中,发送方向多个无线电通信设备发送组数据,并进一步确定足以包含多个无线电通信设备中的每一个的专用确认时隙的呼叫挂起时间。 发送方在确定的每个无线电通信设备的呼叫挂起时间中保留一个确认时隙,并且进一步向每个无线电通信设备发送确认轮询信号,其中确认轮询信号标识为每个无线电通信设备保留的相应确认时隙以确认 接收组数据。 发送者相应地在其相应的保留确认时隙期间从无线电通信设备接收确认。
    • 6. 发明申请
    • Method of Efficiently Synchronizing to a Desired Timeslot in a Time Division Multiple Access Communication System
    • 在时分多址通信系统中有效同步到期望时隙的方法
    • US20120327927A1
    • 2012-12-27
    • US13602752
    • 2012-09-04
    • DAVID G. WIATROWSKIDIPENDRA M. CHOWDHARYTHOMAS B. BOHN
    • DAVID G. WIATROWSKIDIPENDRA M. CHOWDHARYTHOMAS B. BOHN
    • H04W56/00
    • H04W56/0085H04L7/041
    • The time required for the receiving device to synchronize to a desired timeslot is reduced. In operation, a transmitting device selects a synchronization pattern associated with the desired timeslot that is at least mutually exclusive from synchronization patterns associated with other timeslots on the same frequency in the system. Once selected, the transmitting device transmits a burst embedding the synchronization pattern that was selected, where appropriate. If the receiving device detects the synchronization pattern, it immediately synchronizes with the timeslot with confidence that it is synchronizing to the desired timeslot. Using synchronization pattern associated with the desired timeslot that is at least mutually exclusive from synchronization patterns associated with the other timeslots on the same frequency also improves spectral efficiency in direct-mode transmissions, thus allowing more than one subscriber unit to simultaneously transmit in direct mode on a frequency without interfering with other transmissions on the frequency.
    • 接收设备与期望时隙同步所需的时间减少。 在操作中,发送设备选择与期望时隙相关联的同步模式,该期望时隙至少与系统中相同频率上与其他时隙相关联的同步模式相互排斥。 一旦选择,发送装置在适当的情况下发送嵌入所选择的同步模式的突发。 如果接收设备检测到同步模式,则它立即与时隙同步,使其与期望的时隙同步。 使用与期望时隙相关联的同步模式,其至少与同一频率上的其他时隙相关联的同步模式互斥,也提高了直接模式传输中的频谱效率,从而允许多个用户单元以直接模式同时发送 一个频率,而不会干扰频率上的其他传输。