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LTE: Does the encoding steps for PLMN vary in case of two and three digits MNC at eNodeB ?

+4 votes
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This is the format, I know PLMN is encoded.

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Is there any change in the above format for three digits MNC ?

posted Jun 1, 2018 by Vimal Kumar Mishra

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2 Answers

+2 votes

I have always seen the same encoding steps in case of two and three digits MNC. I checked with my colleagues as well. If you are getting different encoding results then probably this would a bug in code at eNodeB. Let's others to respond on this query but I am 100% confident on my answer.

answer Jun 3, 2018 by Harshita
Thanks Harshita to spend some time to my query. Ganesh answer is correct, PLMN is encoded differently at NAS and S1-AP layers in case of 3 digits MNC. For reference, please go through the 36.413, section 9.2.3.8 which tells about encoding format of PLMN at S1-AP layer. PLMN enconding at the NAS layer anyway captured at 24.301.
Thanks Vimal to correct me and sharing references. I'll go through those references and get back to you if I have any doubt or need more clarity.
+1 vote

In case of 2 digits MNC, there is no difference in NAS and S1-AP PLMN encoding. But in case of three digits MNC, NAS and S1-AP results differently. For more details on PLMN encoding, refer NAS and S1-AP specifications.

answer Jun 6, 2018 by Ganesh
Thanks Ganesh for your valuable answer.
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