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Thread: DL 4x4MIMO is not working

  1. #11
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    Default Re: DL 4x4MIMO is not working

    Hello,
    which license have you checked my friend ?

    Quote Originally Posted by hamody2005 View Post
    Dear Expert,



    4x4 MIMO is enabled in HW eNB and CFG parameter and licenses are ok, but KPI related to Rank3 & Rank4 shows no PRB are assigned to them.

    Could you advise?

  2. #12
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    Default Re: DL 4x4MIMO is not working

    Quote Originally Posted by mounir34 View Post
    Hello,
    which license have you checked my friend ?
    All licenses related to 4x4
    4x4MIMO, BB Tx/Rx channel, RF Tx/Rx channel

  3. #13
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    Default Re: DL 4x4MIMO is not working

    Quote Originally Posted by subway View Post
    I have not seen a single UE that has 4x4 below band 3. Sub-1GHZ is definitely 2x2, but on the RAN side it is similar. Even the dual or triple-band RRUs (ZTE for example) has 4 RX, but only 2 TX per band on combined ports.

    But you can attach the full UE capab here, and we can take a look.
    Please see attached file, which is for Note9, but from message it's Cat4
    Attached Files Attached Files

  4. #14
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    Default Re: DL 4x4MIMO is not working

    cat 4 only can 2 layers.

    UL AND DL PARAMETERS FOR LTE UE CATEGORIES 1 – 5
    LTE CATEGORY
    PARAMETER LTE CAT 1 LTE CAT 2 LTE CAT 3 LTE CAT 4 LTE CAT 5
    Max number of DL-SCH transport block bits received in a TTI 10 296 51 024 102 048 150 752 302 752
    Max number of bits of a DL-SCH block received in a TTI 10 296 51 024 75 376 75 376 151 376
    Total number of soft channel bits 250 368 1 237 248 1 237 248 1 827 072 3 667 200
    Maximum number of supported layers for spatial multiplexing in DL 1 2 2 2 4
    Max number of bits of an UL-SCH transport block received in a TTI 5 160 25 456 51 024 51 024 75 376
    Support for 64-QAM in UL No No No No Yes
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  5. #15
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    Default Re: DL 4x4MIMO is not working

    Quote Originally Posted by auto_art View Post
    cat 4 only can 2 layers.

    UL AND DL PARAMETERS FOR LTE UE CATEGORIES 1 – 5
    LTE CATEGORY
    PARAMETER LTE CAT 1 LTE CAT 2 LTE CAT 3 LTE CAT 4 LTE CAT 5
    Max number of DL-SCH transport block bits received in a TTI 10 296 51 024 102 048 150 752 302 752
    Max number of bits of a DL-SCH block received in a TTI 10 296 51 024 75 376 75 376 151 376
    Total number of soft channel bits 250 368 1 237 248 1 237 248 1 827 072 3 667 200
    Maximum number of supported layers for spatial multiplexing in DL 1 2 2 2 4
    Max number of bits of an UL-SCH transport block received in a TTI 5 160 25 456 51 024 51 024 75 376
    Support for 64-QAM in UL No No No No Yes
    Thanks , but from Samsung website Note9 is not cat4 "Faster capability in comparison to any other smartphone without a Cat. 18 modem"

  6. #16
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    Default Re: DL 4x4MIMO is not working

    Perfectly normal, I only know 2 phones in the world that support 4x4 in B28, the Sony Xperia 1 (J9110) and Sony Xperia 1III (XB-BC52).

  7. #17
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    Default Re: DL 4x4MIMO is not working

    Do they support B20 4T4R?

    Quote Originally Posted by joaoo View Post
    Perfectly normal, I only know 2 phones in the world that support 4x4 in B28, the Sony Xperia 1 (J9110) and Sony Xperia 1III (XB-BC52).

  8. #18
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    Default Re: DL 4x4MIMO is not working

    Yes, they suport B20, B28 and also B8 with 4T4R.

  9. #19
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    Default Re: DL 4x4MIMO is not working

    This phone does not support 4x4 on band 20 or 28 for sure.

    Non the less, the fact the modem is Cat4, that does not mean it cannot have 4 receive chains. It can, but not for MIMO (spatial multiplexing), but for simple diversity combining. The UE category only limits the spatial stream number, not the actual receive chain number.

  10. #20
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    Default Re: DL 4x4MIMO is not working

    vérifier le type de votre UE s'il prend en charge 4T4R

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