公开(公告)号：AT387069T

公开(公告)日：2008-03-15

申请号：AT03291106

申请日：2003-05-09

Applicant: MOTOROLA INC

Inventor： CAI ZHIJUN ,  AL-BAKRI BAN ,  BURBIDGE RICHARD

IPC: H04L12/18 ,  H04L12/56 ,  H04W4/06 ,  H04W28/08 ,  H04W28/12

Abstract: A communication system (100) determines whether to establish a point-to-multipoint communication or a point-to-point communication for conveyance of Multimedia Broadcast Multicast Service (MBMS) data based on a number of mobile stations (MSs) (102-104), both idle mode and maintaining an active connection, serviced by the system and subscribed to an MBMS service. The system broadcasts (306) a control message that includes an access probability factor. In order to avoid overloading the system with responses to the control message, MSs maintaining an active connection ignore (506, 508) the control message while idle mode MSs determine (506, 512) whether to respond based on the access probability factor. The system compares (310) a number of received responses to a threshold and determines whether to establish a point-to-multipoint communication (312) or a point-to-point communication (322) based on the comparison. The system also adjusts (314, 330) the access probability factor based on the number of responses.

公开(公告)号：DE60319206T2

公开(公告)日：2009-04-16

申请号：DE60319206

申请日：2003-05-09

Applicant: MOTOROLA INC

Inventor： CAI ZHIJUN ,  AL-BAKRI BAN ,  BURBIDGE RICHARD

IPC: H04W4/06 ,  H04W28/08 ,  H04W28/12

Abstract: A communication system (100) determines whether to establish a point-to-multipoint communication or a point-to-point communication for conveyance of Multimedia Broadcast Multicast Service (MBMS) data based on a number of mobile stations (MSs) (102-104), both idle mode and maintaining an active connection, serviced by the system and subscribed to an MBMS service. The system broadcasts (306) a control message that includes an access probability factor. In order to avoid overloading the system with responses to the control message, MSs maintaining an active connection ignore (506, 508) the control message while idle mode MSs determine (506, 512) whether to respond based on the access probability factor. The system compares (310) a number of received responses to a threshold and determines whether to establish a point-to-multipoint communication (312) or a point-to-point communication (322) based on the comparison. The system also adjusts (314, 330) the access probability factor based on the number of responses.

公开(公告)号：DE60319206D1

公开(公告)日：2008-04-03

申请号：DE60319206

申请日：2003-05-09

Applicant: MOTOROLA INC

Inventor： CAI ZHIJUN ,  AL-BAKRI BAN ,  BURBIDGE RICHARD

IPC: H04L12/18 ,  H04L12/56 ,  H04W4/06 ,  H04W28/08 ,  H04W28/12

Abstract: A communication system (100) determines whether to establish a point-to-multipoint communication or a point-to-point communication for conveyance of Multimedia Broadcast Multicast Service (MBMS) data based on a number of mobile stations (MSs) (102-104), both idle mode and maintaining an active connection, serviced by the system and subscribed to an MBMS service. The system broadcasts (306) a control message that includes an access probability factor. In order to avoid overloading the system with responses to the control message, MSs maintaining an active connection ignore (506, 508) the control message while idle mode MSs determine (506, 512) whether to respond based on the access probability factor. The system compares (310) a number of received responses to a threshold and determines whether to establish a point-to-multipoint communication (312) or a point-to-point communication (322) based on the comparison. The system also adjusts (314, 330) the access probability factor based on the number of responses.

公开(公告)号：GB2373972A

公开(公告)日：2002-10-02

申请号：GB0108007

申请日：2001-03-30

Applicant: MOTOROLA INC

Inventor： ROBINSON WILLIAM NEIL ,  FERNANDES EDGAR ,  BURBIDGE RICHARD

IPC: H04B1/707 ,  H04B7/26 ,  H04L1/00 ,  H04Q7/38

Abstract: A communication system (100), comprising a first communication unit (112) communicating (118) with a second communication unit (122), said first communication unit (112) transmitting to said second communication unit a preamble (516) prior to a message, wherein the preamble is a concatenation of signals, said second communication unit receives and decodes the preamble (516) and compares the received concatenated signals with known predetermined concatenated signals to determine whether an error has occurred in said preamble (516) or said first message. This enables a system employing the FAUSCH concept to carry more information than a simple request for a channel. For example, it could include the data rate of the required channel. It also allows an extra degree of flexibility when designing the protocols. It allows forward error correction to be applied to the channel. Hence, the receiver can detect and correct some transmission errors.