[srslte-users] A bug in packing mme group id in GUTI

[Hongil Kim]

Hi, I'm currently playing with srsUE and mainly focusing on the functionalities that have not been implemented yet such as handover procedure.Anyway, I think I found a bug where the wrong GUTI value might be packed. On the "liblte_mme_pack_eps_mobile_id_ie()" function in liblte_mme.cc, it only takes the lower 4 bits of each byte in "mme_group_id" ( line 1414, 1416).However, when I see the allocated "mme_group_id" in commercial networks, it seems to use all the 16bits. Also, I can't find any special rules allocating "mme_group_id" in the related 3GPP spec. except that "the most significant bit of "mme_group_id" shall be set to one" [1].So, I think "& 0x0F" in line 1414 and 1416 should be chaged to "& 0xFF". Please check it and give any advice about it.[1] 3GPP TS 23.003 version 10.5.0 Release10. Numbering, addressing and identification.Thanks,Hongil Kim
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