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C1-111657
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Reply LS on Network Sharing (S2-112197)
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SA2
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To
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Noted
SA treated SA's C1-111667 and agreed a Rel-10 CR (to 23.251) for NW sharing. CSG and Hybrid cells are noted as exceptions, but all other new features should be designed to work in network sharing environments.
This SA2 CR is to Rel-10, so all all features done by CT1 in Rel-10 to be chcecked?
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C1-111658
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Reply LS on excessive updates of NAS security context (S3-110529)
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SA3
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To
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Noted
Related Tdocs in C1-111816, C1-111817 and C1-111818.
Answer from SA3 to LS from CT6 (C1-111624).
SA3 thanks CT6 for the LS on excessive updates of NAS security context in (C6-110184 / S3-110341). In this LS CT6 proposed a way forward to solve the problem of excessive writes to the USIM/non-volatile ME memory. The proposed solution is that the ME shall only write the EPS NAS security context to the USIM/non-volatile memory on a state transition from any state to EMM-DEREGISTERED or when an attempt of a state transition away from EMM-DEREGISTERED with the intent to reach EMM-REGISTERED fails.
SA3 has analysed the proposed way forward (see attached discussion paper in S3-110452 for further information). The outcome of SA3's analysis is that it is an acceptable approach.
SA3 has described the process on a stage 2 level as if there are no intermediate states between EMM-DEREGISTERED and EMM-REGISTERED. SA3 understands that there are additional states, but this is a stage 3 detail which is to be taken into account by CT1.
SA3 has agreed the set of CRs attached to this LS (S3-110526, S3-110527 and S3-110528). These CRs implement the same changes to Rel-8, Rel-9 and Rel-10 of TS 33.401. SA3 kindly asks CT1 to implement the corresponding changes to TS 24.301 for Rel-8, Rel-9 and Rel-10.
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