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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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).
Yes, they suport B20, B28 and also B8 with 4T4R.
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.
vérifier le type de votre UE s'il prend en charge 4T4R
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