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    METHOD AND SYSTEM FOR DETERMINING A QUALITY VALUE OF A VIDEO STREAM
    6.
    发明专利
    METHOD AND SYSTEM FOR DETERMINING A QUALITY VALUE OF A VIDEO STREAM 未知

    公开(公告)号：CA2742716C

    公开(公告)日：2016-08-23

    申请号：CA2742716

    申请日：2008-11-04

    Applicant: ERICSSON TELEFON AB L M

    Inventor： GUSTAFSSON JOERGEN ,  LINDEGREN DAVID ,  PETTERSSON MARTIN

    IPC: H04N17/00

    Abstract: Hence a method is provided for determining a quality value of a video stream, comprising the steps of: identifying lost data packets of the video stream; identifying at least two intra coded frames of the video stream; determining intra coded frames having a maintained image quality, based on estimating if a lost data packet is associated with an intra coded frame; esti-mating a distance between each one of the lost data packets and a next respective, subsequent intra coded frame having a main-tained image quality; and generating the quality value, based on the distances. A system and a computer readable medium are also described.

    METHOD AND SYSTEM FOR DETERMINING A QUALITY VALUE OF A VIDEO STREAM
    8.
    发明专利
    METHOD AND SYSTEM FOR DETERMINING A QUALITY VALUE OF A VIDEO STREAM 未知

    公开(公告)号：CA2742716A1

    公开(公告)日：2010-05-14

    申请号：CA2742716

    申请日：2008-11-04

    Applicant: ERICSSON TELEFON AB L M

    Inventor： GUSTAFSSON JOERGEN ,  LINDEGREN DAVID ,  PETTERSSON MARTIN

    IPC: H04N17/00

    Abstract: Hence a method is provided for determining a quality value of a video stream, comprising the steps of: identifying lost data packets of the video stream; identifying at least two intra coded frames of the video stream; determining intra coded frames having a maintained image quality, based on estimating if a lost data packet is associated with an intra coded frame; estimating a distance between each one of the lost data packets and a next respective, subsequent intra coded frame having a maintained image quality; and generating the quality value, based on the distances. A system and a computer readable medium are also described.

    9.
    发明专利
    未知

    公开(公告)号：DE60232022D1

    公开(公告)日：2009-05-28

    申请号：DE60232022

    申请日：2002-01-25

    Applicant: ERICSSON TELEFON AB L M

    Inventor： LARSSON KJELL ,  SVENSSON BJOERN ,  GUSTAFSSON JOERGEN

    IPC: H04W24/00

    Abstract: The present invention relates to a method to identify one or more interference sources in a mobile radio system, preferably in a GSM radio network for mobile telephones. A received signal (r) consists of a wanted signal and a number of interference signals of which one is a dominating interference signal and where all signals includes a known training sequence (TK 1 ,TK 2 , . . . ). The carrier is estimated and subtracted from the received signal (r) giving a remaining interference signal (s).This signal is correlated against known training sequences (TKj, j=0,1,2, . . . ,7) resulting in a training sequence associated with the interfering signal. According to the invention, the identification code (BCC) of a possible interference source (BS1) from said training sequence is determined. After that, a number of candidates (CA 1 ,CA 2 , ), each corresponding with a certain cell from the identification code (BCC) are determined and also the frequency which is disturbed and the timing offset (t 1 ,t 2 , . . . FIG. 7 ) for the frequencies used by said candidates. Finally it is investigated if one or more (fa,fb) of these have the same time offset as the interference signal (t 0 ) resulting in that at least one candidate (CA 3 ) with the best matching offsets on its frequencies is identified as the interference source.

    10.
    发明专利
    未知

    公开(公告)号：AT429137T

    公开(公告)日：2009-05-15

    申请号：AT02710597

    申请日：2002-01-25

    Applicant: ERICSSON TELEFON AB L M

    Inventor： LARSSON KJELL ,  SVENSSON BJOERN ,  GUSTAFSSON JOERGEN

    IPC: H04W24/00

    Abstract: The present invention relates to a method to identify one or more interference sources in a mobile radio system, preferably in a GSM radio network for mobile telephones. A received signal (r) consists of a wanted signal and a number of interference signals of which one is a dominating interference signal and where all signals includes a known training sequence (TK 1 ,TK 2 , . . . ). The carrier is estimated and subtracted from the received signal (r) giving a remaining interference signal (s).This signal is correlated against known training sequences (TKj, j=0,1,2, . . . ,7) resulting in a training sequence associated with the interfering signal. According to the invention, the identification code (BCC) of a possible interference source (BS1) from said training sequence is determined. After that, a number of candidates (CA 1 ,CA 2 , ), each corresponding with a certain cell from the identification code (BCC) are determined and also the frequency which is disturbed and the timing offset (t 1 ,t 2 , . . . FIG. 7 ) for the frequencies used by said candidates. Finally it is investigated if one or more (fa,fb) of these have the same time offset as the interference signal (t 0 ) resulting in that at least one candidate (CA 3 ) with the best matching offsets on its frequencies is identified as the interference source.

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