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    Access technique of channel hopping communications system
    61.
    发明专利
    Access technique of channel hopping communications system 未知

    公开(公告)号：AU732197B2

    公开(公告)日：2001-04-12

    申请号：AU5581598

    申请日：1997-12-19

    Applicant: ERICSSON TELEFON AB L M

    Inventor： HAARTSEN JACOBUS ,  DENT PAUL

    IPC: H04W52/02 ,  H04Q7/00

    Abstract: Establishing a connection between a paging unit and a standby unit in a channel hopping communications system includes activating the standby unit for an activation time period out of every standby time period. During each activation time period, the standby unit monitors a selected channel for receipt of a paging message. The selected channel is selected from a plurality of channels, and, for each subsequent activation time period, the selected channel is a subsequent one of the plurality of channels as specified by a hopping sequence and an internal clock. A page train is repeatedly transmitted from the paging unit to the standby unit, until a response is received from the standby unit. Each page train includes a plurality of paging messages, each paging message being transmitted on a different one of a subset of the plurality of channels. Selection of a page train for transmission by the paging unit may be based on an estimate of the standby unit's internal clock.

    62.
    发明专利
    未知

    公开(公告)号：DE19882299T1

    公开(公告)日：2000-04-13

    申请号：DE19882299

    申请日：1998-04-03

    Applicant: ERICSSON TELEFON AB L M

    Inventor： DENT PAUL ,  HAARTSEN JACOBUS

    IPC: H04M15/16 ,  H04B7/005 ,  H04B7/26 ,  H04M15/00 ,  H04M15/12 ,  H04W4/24 ,  H04W8/18 ,  H04W8/22 ,  H04W16/12 ,  H04W28/18 ,  H04W52/28 ,  H04W72/08 ,  H04Q7/00

    Abstract: In a multi-reuse level cellular communications system, a channel is assigned for use by a mobile unit by first determining whether the mobile unit is a non-enhanced mobile unit or an enhanced mobile unit. Then a determination is made as to the type of communication service being requested. A minimum link quality required by the mobile unit can then be established based on factors that include the mobile unit type and the type of communication service being requested. A base station that has the necessary receiver detection capabilities and transceiver processing capabilities is then selected, and a channel, corresponding to a highest reuse plan, available to the base station is assigned to the call.

    Demodulator circuits
    65.
    发明专利
    Demodulator circuits 未知

    公开(公告)号：AU3518799A

    公开(公告)日：1999-10-18

    申请号：AU3518799

    申请日：1999-03-19

    Applicant: ERICSSON TELEFON AB L M

    Inventor： MATTISSON SVEN ,  HAARTSEN JACOBUS

    IPC: H03D3/00 ,  H03J3/08

    Abstract: A demodulator circuit for demodulating a frequency modulated input, which includes a detector (14) that is operable to produce a demodulated signal from an incoming frequency modulated signal. A tuning circuit (19) is connected to the detector and operable to vary the frequency response characteristics of the detector. An auxiliary detector (25, 26) is connected to receive a reference frequency signal and to provide an auxiliary tuning signal to the detector on the basis of detection of the reference frequency signal.

    Demodulator circuits
    68.
    发明专利
    Demodulator circuits 未知

    公开(公告)号：GB2335808A

    公开(公告)日：1999-09-29

    申请号：GB9806204

    申请日：1998-03-24

    Applicant: ERICSSON TELEFON AB L M

    Inventor： MATTISSON SVEN ERIK ,  HAARTSEN JACOBUS

    IPC: H03D3/00 ,  H03J3/08

    Abstract: A demodulator circuit for demodulating a frequency modulated input signal comprises detector means (14) which are operable to produce a demodulated signal from an incoming frequency modulated signal, tuning means (19) connected to the detector means and operable to vary the frequency response characteristics of the detector means, and auxiliary detector means (25, 26) connected to receive a reference frequency signal and to provide an auxiliary tuning signal to said detector means, on the basis of detection of said reference frequency signal. The tuning means (19) preferably including a PLL tunes the IF filter (10) and detector (14) to the nominal IF frequency. The auxiliary detector (25) receiving the tuning signal and the PLL oscillator output tunes the detector 14 further for obtaining a zero d.c. offset output. The demodulator may form part of an analog or digital radio receiver.

    69.
    发明专利
    未知

    公开(公告)号：BR9612365A

    公开(公告)日：1999-07-13

    申请号：BR9612365

    申请日：1996-12-19

    Applicant: ERICSSON TELEFON AB L M

    Inventor： HAARTSEN JACOBUS

    IPC: H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L29/06 ,  H04L29/08 ,  H04Q7/32 ,  H04L12/28

    Abstract: A retransmission method is disclosed wherein retransmissions over the sensitive link of the connection only involves packets that were actually disturbed in the sensitive link. At the same time, required storage capacity in the relay stations connecting the sensitive link to the nonsensitive link is reduced. Errors occurring in the sensitive part of the connection will cause retransmission over nonsensitive links of the connection as well, but this is considered to be of less importance since the nonsensitive links have a high throughput and/or low costs.

    Access technique of channel hopping communications system
    70.
    发明专利
    Access technique of channel hopping communications system 未知

    公开(公告)号：AU5581598A

    公开(公告)日：1998-07-17

    申请号：AU5581598

    申请日：1997-12-19

    Applicant: ERICSSON TELEFON AB L M

    Inventor： HAARTSEN JACOBUS ,  DENT PAUL

    IPC: H04W52/02 ,  H04Q7/00

    Abstract: Establishing a connection between a paging unit and a standby unit in a channel hopping communications system includes activating the standby unit for an activation time period out of every standby time period. During each activation time period, the standby unit monitors a selected channel for receipt of a paging message. The selected channel is selected from a plurality of channels, and, for each subsequent activation time period, the selected channel is a subsequent one of the plurality of channels as specified by a hopping sequence and an internal clock. A page train is repeatedly transmitted from the paging unit to the standby unit, until a response is received from the standby unit. Each page train includes a plurality of paging messages, each paging message being transmitted on a different one of a subset of the plurality of channels. Selection of a page train for transmission by the paging unit may be based on an estimate of the standby unit's internal clock.

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