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    • 2. 发明授权
    • Wireless communication system incorporating multicast addressing and
method for use
    • 包含多播寻址和使用方法的无线通信系统
    • US06141347A
    • 2000-10-31
    • US283121
    • 1999-03-31
    • Mark ShaughnessyJames E. MathisSurender KumarBhavesh G. PatelMario F. DeRango
    • Mark ShaughnessyJames E. MathisSurender KumarBhavesh G. PatelMario F. DeRango
    • H04L12/28H04L12/56H04W84/08H04L12/46
    • H04W84/08
    • A wireless communication system 200 comprises a connectionless packet network 201 coupled to a plurality of sites 203-208 that are in wireless communication with a plurality of subscriber units 210-217 logically arranged into a plurality of talk groups having corresponding talk group identifications. In one embodiment, each site maintains mappings 220-225 of at least one multicast address to at least one talk group identification. In another embodiment, individual subscriber units maintain such mappings 320. When a subscriber unit affiliates with a given site and talk group (501, 601), the site identifies a multicast address corresponding to the talk group. Based on the multicast address, the site can participate in traffic targeted for the multicast address and, consequently, for the talk group. In this manner, mobility Processing is decentralized, system calability is improved and call setup delays are minimized.
    • 无线通信系统200包括耦合到多个站点203-208的无连接分组网络201,多个站点203-208与多个订户单元210-217进行无线通信,逻辑上排列成具有相应通话组标识的多个通话组。 在一个实施例中,每个站点将至少一个多播地址的映射220-225维护到至少一个通话组标识。 在另一个实施例中,各个用户单元保持这种映射320.当与给定站点和通话组(501,601)关联的用户单元时,站点标识与通话组相对应的多播地址。 基于组播地址,站点可以参与针对组播地址的流量,因此可以参与通话组。 以这种方式,移动性处理是分散的,系统可计算性得到改善,呼叫建立延迟最小化。
    • 7. 发明授权
    • System and methods for distributed connection and mobility processing in a multicast IP network incorporating multi-cell location areas
    • 包含多小区位置区域的组播IP网络中的分布式连接和移动性处理的系统和方法
    • US06697349B2
    • 2004-02-24
    • US09945459
    • 2001-08-30
    • James E. MathisMark L. ShaughnessySurender Kumar
    • James E. MathisMark L. ShaughnessySurender Kumar
    • H04Q724
    • H04L45/00H04L45/16H04W40/32H04W68/00
    • A wireless communication system 200 comprises a connectionless packet network 201 coupled to a plurality of sites 203-208 that are in location areas 260, 261. The sites join respective location area multicast addresses to receive messages from other sites in their location area. Communication units desiring to participate in talkgroup calls need only to register affiliation with a first site of the location area. Upon the first site receiving an affiliation message, it joins a payload multicast group address to receive payload for the talkgroup. In alternative embodiments, the first site sends, via the location area multicast address, either control message(s) or tunneled payload associated with the talkgroup call to secondary site(s) of the location area. The sites initiate paging sequences to determine whether communication units at their sites desire to participate in the call and, based on the responses, the sites may deliver stored payload and/or join the payload multicast group address to receive payload for the call. In this manner, a centralized entity such as a VLR is not needed to keep track of communication units in the location area.
    • 无线通信系统200包括耦合到位置区域260,261中的多个站点203-208的无连接分组网络201.站点加入相应的位置区域多播地址以从其位置区域中的其他站点接收消息。 希望参加谈话组呼叫的通信单元仅需要注册与位置区域的第一个站点的归属。 在第一站点接收到附属消息时,它加入有效载荷多播组地址以接收该通话组的有效载荷。 在替代实施例中,第一站点经由位置区域多播地址将与通话组呼叫相关联的控制消息或隧道传输的有效载荷发送到位置区域的次要站点。 站点启动寻呼序列以确定其站点上的通信单元是否希望参与呼叫,并且基于响应,站点可传送存储的有效载荷和/或加入有效载荷多播组地址以接收呼叫的有效载荷。 以这种方式,不需要诸如VLR的集中实体来跟踪位置区域中的通信单元。