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    METHOD AND APPARATUS FOR GROUP CALLS IN A WIRELESS CDMA COMMUNICATION SYSTEM
    12.
    发明公开
    METHOD AND APPARATUS FOR GROUP CALLS IN A WIRELESS CDMA COMMUNICATION SYSTEM 有权
    VERFAHREN UND VORRICHTUNGFÜRGRUPPENANRUFE在EINEM SCHNURLOSEN CDMA-KOMMUNIKATIONSSYSTEM

    公开(公告)号：EP0997010A4

    公开(公告)日：2000-06-28

    申请号：EP99917564

    申请日：1999-04-16

    Applicant: MOTOROLA INC

    Inventor： CHINITZ LEIGH M ,  NEEDHAM MICHAEL L ,  WILSON TIMOTHY J

    IPC: H04B7/26 ,  H04W4/06 ,  H04W52/14 ,  H04W52/24 ,  H04W84/08 ,  H04B7/216

    CPC classification number: H04W52/247 ,  H04W4/06 ,  H04W52/146 ,  H04W84/08

    Abstract: A controller, in response to receiving a request for a group call (201), allocates at least one power adjustment channel to the group call (202) and sends identification of the at least one power adjustment channel to at least some of the subscriber units in the group (203). Using the at least one power adjustment channel, the controller also sends unique power adjustment information to each of the at least some subscriber units (204).

    Abstract translation: 控制器响应于接收到群呼叫（201）的请求而将至少一个功率调整信道分配给群呼叫（202），并且将至少一个功率调整信道的标识发送到至少一些用户单元 在组（203）中。 使用该至少一个功率调整信道，该控制器还向该至少一些用户单元（204）中的每一个发送唯一的功率调整信息。

    14.
    发明专利
    未知

    公开(公告)号：BR0213806A

    公开(公告)日：2004-10-19

    申请号：BR0213806

    申请日：2002-11-21

    Applicant: MOTOROLA INC

    Inventor： NEEDHAM MICHAEL L ,  WILSON TIMOTHY J ,  CHINITZ LEIGH M

    IPC: H04J13/00 ,  H04L12/58 ,  H04W4/08 ,  H04W36/18 ,  H04Q7/38

    Abstract: To address the need for an apparatus and method for CDMA-dispatch soft handoff, the present invention provides soft handoff to mobile stations (MSs) ( 120-123 ) in a dispatch call by sharing soft handoff information with all the MSs in the call at a base site ( 111 ). When a first MS (e.g., 120 ) needs to soft handoff, the identity of a soft handoff channel ( 135 ) at an adjacent base site ( 112 ) is shared with all the MSs. Thus, subsequent MSs (e.g. 122 ) that need to soft handoff to that adjacent base site may do so without requesting a soft handoff.

    18.
    发明专利
    未知

    公开(公告)号：BR9813326A

    公开(公告)日：2000-08-22

    申请号：BR9813326

    申请日：1998-07-31

    Applicant: MOTOROLA INC

    Inventor： CHINITZ LEIGH M ,  NEEDHAM MICHAEL L ,  WILSON TIMOTHY J

    IPC: H04B7/216 ,  H04B7/26 ,  H04W4/06 ,  H04W4/14 ,  H04W72/04 ,  H04W84/08 ,  H04J13/00 ,  H04J3/02 ,  H04B7/185 ,  H04B7/19

    Abstract: A quality dispatch service on a CDMA based wireless system (50). To achieve spectral efficiency and fast access for follow-up calls, in response to a request by a talkgroup member (A-D) to have a group call established, the non-requesting (listening-only) members (B-D) are allowed to establish a low-rate (non-voice) signaling link (54-56) in the reverse direction (inbound) for the limited purpose of (i) providing forward power control information to the fixed infrastructure; (ii) requesting soft hand-off when required; and (iii) maintaining the correct reverse link power control to allow for fast channel access for a follow-on call.

    Minimising adjacent channel coupled power interference (ACCP) by assigning radio channels according to received signal strength
    19.
    发明专利
    Minimising adjacent channel coupled power interference (ACCP) by assigning radio channels according to received signal strength 未知

    公开(公告)号：GB2345827A

    公开(公告)日：2000-07-19

    申请号：GB9927030

    申请日：1999-11-17

    Applicant: MOTOROLA INC

    Inventor： MARSAN MARK J ,  CHINITZ LEIGH M

    IPC: H04W72/08 ,  H04Q7/38

    Abstract: A radio communication system assigns use of a radio frequency communication resource 400 comprising multiple communication channels 411-466 in a way that minimises the likelihood that a weakly received signal will be interfered with by a strongly received signal in an adjacent communication channel. The communication system determines a signal strength of a signal received from a user of the communication resource and based on the signal strength determination, assigns the user at least one of the communication channels available. Preferably, at least one threshold value is defined and a first channel is assigned if the received signal strength is less than the threshold value and a second channel is assigned if the signal strength is equal to or greater than the first threshold value. Preferably, the communication resource 400 comprises a plurality of frequencies 401-406 each comprising a plurality of time slots 411-466, where the communication channel is a single time slot and there are defined sets 1-6 of concurrently transmitted timeslots each set being designated for particular strengths of received signal. Thus signals with differing strengths are preferably assigned to non-concurrent time slots. Further, if none of the slots from the appropriate set are available, a slot from another set may be assigned depending on its frequency separation from slots already assigned in its set or further depending on a level of signal interference in the slot. Additionally, a channel may be re-assigned if a signal strength comparison indicates an undesirable change in the signal strength.

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