| Discussion and conclusion:
Not Handled. Postponed to meeting #113.
TD S2 160487 LS from RAN WG3: LS on questions on NB-IoT. (RAN WG3)
Abstract: RAN WG3 has discussed the delivery of NAS over S1 for CP NB IoT optimisation (former solution 2 TR 23.720). RAN WG3 is wondering, if there are S1 protocol impacts due to carrying data and signalling over NAS, see CP NB IoT optimisation (former solution 2 TR 23.720)?
Action: RAN WG3 ask to provide guidance on aspects described above, if any.
Discussion and conclusion:
Not Handled. Postponed to meeting #113.
TD S2 160488 LS from RAN WG3: LS on Release of Control Plane for DONAS. (RAN WG3)
Abstract: RAN WG3 has reviewed the SA WG2 technically endorsed CR2942 on TS 23.401 introducing the control plane solution and noticed that this SA WG2 CR introduced a new Release Indication IE sent together with the last DL data over S1AP and RRC in steps 11 and 12 of section 5.3.4B.2.
Instead of modifying these two S1AP and RRC procedures which are currently only used to transport data RAN WG3 considered that the MME may proceed in two steps:
- First MME sends the DL data in an unmodified S1AP DL NAS Transport message;
- Second MME sends immediately after an S1AP UE Context Release Command message to the eNB to
tear down the S1/RRC connection.
Action: RAN WG3 kindly ask SA WG2 to consider the alternative as possible solution and provide guidance.
Discussion and conclusion:
Not Handled. Postponed to meeting #113.
TD S2 160489 LS from RAN WG3: LS on CIoT optimization. (RAN WG3)
Abstract: RAN WG3 has discussed the CIoT optimization and RAN WG3 would like to ask the following questions:
1) If the MME doesn't allow a UE to use NB IoT based on the UE's subscription, does the MME reject the
attach request or does the MME request the eNB and the UE to fall back to the legacy mode if the UE is
capable of the legacy and NB IOT?
2) For the MME selection in case of the heterogeneous deployment of the MME, RAN WG3 thought it is
beneficial that eNB receives information over RRC from the NB IoT UE of the supported CIoT
optimisation solutions.
Action:
- RAN WG3 kindly ask SA WG2 to provide guidance on 1);
- RAN WG3 kindly ask RAN WG2 to provide guidance on 2).
Discussion and conclusion:
Not Handled. Postponed to meeting #113.
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