1. 3GPP RAN WG1 Chairman Satoshi Nagata
RP-17xxxx
3GPP TSG RAN #75
Dubrovnik, Croatia, 6 – 9 March, 2017
Status Report for RAN WG1 to TSG-RAN #75
3GPP RAN WG1 Chairman
Satoshi Nagata

2. Executive Summary
RAN1 NR Ad-Hoc
16 – 20 Jan. 2017
Spokane, USA
RAN1 #88
13 – 17 Feb. 2017
Athens, Greece
RAN #75
6– 9 Mar. 2017
Dubrovnik, Croatia
RAN1 specs for both LTE and HSPA up to and including Rel-13 are stable
Almost all Rel-14 LTE SI/WIs can be closed
All Rel-14 LTE RAN1 parts can be closed
Rel-14 NR SI can be closed

3. Delegates in RAN1

4. Tdocs submitted to RAN1

5. E-UTRA Maintenance (from Rel-8 to Rel-13)

6. E-UTRA CRs No Rel-8 to Rel-10 CRs
One Rel-11 CR and one Rel-12 shadow CR
Clarification of EPDCCH port index
Numerous Rel-13 CRs covering eCA, eMTC, NB-IoT and UE category
Overall, Rel-13 RAN1 specification is stable

7. E-UTRA Rel-14/15

8. Overview of RAN1-led LTE SI/WIs
Title
Completion level %
Target completion date SR
RAN1
Overall
Agreed
Proposed
LTE-based V2X Services WI
100%
RAN#75 RP
Enhancements on FD-MIMO RP
eMBMS
90%
RAN#76 RP
UL capacity enhancement RP
Further Enhanced MTC for LTE
95% RP
Enhancements of NB-IoT
93% RP
Shortened TTI and processing time for LTE
40%
30%
RAN#77 RP
(RAN2-led item) Voice and Video enhancement for LTE RP
Further enhancements to CoMP operation SI RP
(RAN2-led item) Further enhancements to LTE D2D, UE to NW relays for IoT and wearables
15%
35% RP
Disputed
red
Proposal for change

9. Rel-14 CRs
Rel-14 CRs include eLAA, V2V, MUST, eMBMS, SRS carrier based switching, UL capacity enhancements and PRACH for high speed
Both eLAA and V2V have a sizable number of CRs, while other Rel-14 items have limited number of CRs

10. LTE-based V2X Services
Agreements on resource selection for Pedestrian UEs:
Selection between random resource selection and partial sensing
Agreements on congestion control in PC5
Priority handling for channel occupancy ratio evaluation and applying the upper limit
Channel busy ratio measurement on exceptional pools and non-adjacent SA/data case
Use of (pre)configured CBR for P-UEs not capable of receiving sidelink
Agreements on SLSS-based synchronization
Details of SLSS ID selection procedure
Agreements on multiplexing V2V with other signals
Details of locating the subframes not used for V2V
Details of scaling the resource reservation interval in TDD carriers
Agreements on shorter resource reservation interval
Scaling the resource reselection counter
SL-RSSI measurement interval based on the transmitter’s resource reservation interval
V2X WI can be closed from RAN1 point of view
CRs for , , , are submitted for approval

11. Enhancements on FD-MIMO for LTE
All aspects complete in RAN1
CRs submitted to RAN#75 for approval

12. Further Enhanced MTC for LTE
Higher data rate support
Max TBS for the new 5-MHz BL UE (Cat-M2) is 4008 bits in DL and 6968 bits in UL
Max DL TBS for CE mode configured with max 20 MHz channel bandwidth is bits
All open issues closed (including resource allocation, frequency hopping, TBS table, HARQ-ACK bundling scheme and DCI definition)
Multicast support
Max TBS for SC-MTCH configured to be 1000 bits over 6 PRBs or 4008 bits over 24 PRBs
All open issues closed (including DCI definition and SC-MCCH notification)
OTDOA enhancements
All open issues closed (including PRS frequency hopping and collision handling)
VoLTE enhancements (not limited to VoLTE)
Optional modulation restriction (to QPSK) was introduced for PDSCH and PUSCH
All open issues closed (including scheduling relationships)
Updated list of higher layer parameters sent to RAN2

13. NB-IoT enhancements Work item is completed in RAN1
For OTDOA, agreed remaining details of
Neighbor cell assistance data
QCL between NPRS configurations and between NPRS and PRS configurations, with reduced reporting
Collisions between NPRS and other channels/signals are left to eNB implementation
No consensus on the feasibility and performance of UTDOA using Rel-13 NPRACH.
For multicast, agreed remaining details of
Scheduling delay
Downlink transmission gap applicability
For power consumption and latency reduction, agreed remaining details of
Maximum supported TBS and TBS tables for 2 HARQ UE
Timing relationships for 2 HARQ UE
Common soft buffer size for 1 HARQ and 2 HARQ UE
For non-anchor carrier operation, agreed to reduce the subframes where NRS have to be present during paging and RAR transmission
CRs prepared by spec editors

14. Shortened TTI and processing time for LTE
Reduced processing time for 1ms TTI
Agreements on handling collision between n+3 and n+4 UL grants/DL assignments/PUCCH transmissions/ PUSCH transmissions for the same UE
Agreed on a scheduling timing table for TDD configuration 1-5 for 1ms TTI with n+3
Shortened TTI together with reduced processing time
Agreements on UL structure for 2 OS sTTI
Confirm working assumption of the support of {2, 7} {DL, UL}
Agreements on support of IFDMA UL DMRS for 2os sPUSCH
Agreements on handling collision between sPUSCH and sPUCCH for the same UE
Agreements on UE-specific sPDCCH details for  sTTI scheduling
Agreements on a UE-specific sDCI1 for sTTI scheduling
Agreements on the details to support at least 2 sPUCCH formats
Agreements on the maximum supported layers for both 2OS and 7OS sTTI
LS sent to RAN4 related to transient period
LS sent to RAN2 related to UE battery savings

15. Voice and Video enhancement for LTE
Agreements on details of PUSCH enhancement mode:
Final details of frequency hopping parameters
Final details of DCI monitoring
Final details of DCI contents
Support of msg 3 repetition, and the relevant indication in RAR
Modulation order overriding for VoLTE coverage improvement
Clarification of several UE behavior (ignoring BL/CE UL subframe configuration, PUSCH scrambling, PUSCH DMRS cyclic shift) under the new PUSCH enhancement mode

16. Further enhancements to CoMP operation
TP for TR with detailed description of FeCoMP enhancements to NC-JT and CS/CB with FD-MIMO
Made agreements regarding performance observations for FeCoMP enhancement to NC-JT and CS/CB with FD-MIMO
Made agreements regarding conclusions of the FeCoMP study item
TR v2.0.0 has been endorsed by RAN1

17. Further enhancements to LTE Device to Device
The evaluation methodology for FeD2D was defined
Two deployment scenarios defined for evaluation (one with ISD of 1732m and one with ISD of 500m)
Channel models based on D2D evaluation methodology with minor modifications
Proximate relay dropping procedure adopted
UE transmitter/receiver parameters agreed
Traffic models agreed
Agreement on high level table of contents for the RAN1 section 5.2 of TR36.746

18. New RAT

19. New Radio Access Technology
Made agreements for initial access and mobility, including
Support of at least one basic sequence length for each synchronization signal and several parameter sets with associated default subcarrier spacing and transmission bandwidth
Support of time division multiplexing of NR-PSS and NR-SSS in single/multi-beam scenario, and support of TDM of NR-PSS/SSS and NR-PBCH as working assumption
A single set of possible SS block time locations to be predefined per frequency band
Support of adaptation and NW indication of NR-SS periodicity for IDLE/CONNECTED UE
A single fixed number of antenna ports and transmission scheme (i.e., no blind detection) for NR-PBCH
Principle of NR minimum system information delivery where part of minimum system information (at least part of SFN) is carried by NR-PBCH and remaining minimum system information is carried by NR-PDSCH
Principle of paging channel design where paging message is scheduled by DCI and is transmitted in NR-PDSCH at least for RRC idle state
Support of PRACH preamble format with multiple/repeated RACH OFDM symbols
Support of association between DL signal/channel and subset of RACH resource and/or subset of preamble indices
Support of IDLE mode RRM measurement at least using NR-SSS, and support of CSI-RS based RRM measurement in addition to IDLE mode RS based RRM measurement in CONNECTED mode

20. New Radio Access Technology (cont.)
Made agreements for multi-antenna schemes, including
Regarding multi-antenna scheme,
Support of one codeword (CW) for MIMO layers 1-4 and two CWs for the layers 5-8 (working assumption on 3 and 4 layers)
Support of codebook-based, non-codebook-based and diversity-based UL transmission
Support of frequency selective precoding for UL-MIMO with CP-OFDM when the number of transmission port is equal to or greater than X (FFS: Value of X)
Support of PRB bundling for DL and UL-MIMO
Support of DL transmission from multiple TRPs
Observations of network coordination and advanced receivers
Regarding beam management,
Support of robustness against beam pair link blocking for NR-PDCCH transmission
Support of mechanism triggered by UE to recover from beam failure
Higher layer parameters for beam management
Details on beam reporting
Support of indication on spatial QCL assumption between DL RS antenna port(s) and DMRS antenna port(s) of DL data channel
Definition of beam correspondence and capability indication

21. New Radio Access Technology (cont.)
Made agreements for multi-antenna schemes, including
Regarding CSI acquisition,
Further details on CSI framework including resource setting and CSI reporting setting
Supported combinations of time domain behaviors for CSI-RS transmission and CSI reporting
Timing relationship and triggering mechanism for CSI-RS transmission and CSI reporting
Support of CSI-RS resource indicator (CRI) and its functionality
Candidate technologies for type I and type II CSI reporting
Support of ZP CSI-RS for interference measurement and its time domain behavior
Regarding RS design and QCL,
Details on resource aggregation schemes for CSI-RS, e.g., component CSI-RS RE patterns
DMRS design including front-loaded pattern, common structure between DL and UL and maximal 12 orthogonal ports for DL MU-MIMO (working assumption)
Details of PT-RS pattern and configuration mechanism
Details on SRS including the number of SRS ports, comb levels and its precoding
QCL assumptions with DM-RS port grouping
Others
LS to RAN4 asking requirement of fine time/frequency tracking
Support of beam specific power control
Summary of MIMO calibration with simulation assumptions and results

22. New Radio Access Technology (cont.)
Made agreements for downlink control channels, including
Some details of PDCCH design
Support of ‘group common PDCCH’ that carries information intended for a group of UEs
Support of transmit diversity scheme for DL control channel with 1 or 2 antenna ports
Made agreements for uplink control channels, including
Some details of PUCCH design
PUCCH can span 1 or 2 symbols (short format) or more than 3 symbols (long format)
Support of dynamic indication and semi-static configuration of PUCCH resource
Made agreements for scheduling and HARQ aspects, including
Some details of scheduling and HARQ mechanisms
Support of one HARQ-ACK bit and multiple HARQ-ACK bits per transport-block
Support of code-block-group based re-transmission
Made agreements for URLLC specific aspects, including
Support of indication for eMBB UE on which time/frequency resource is impacted by URLLC
Support of semi-statically configured UL transmission without grant
Support of K repetition of a TB transmission with/without grant

23. New Radio Access Technology (cont.)
Made agreements for mini-slot designs, including
Use-cases and design targets of mini-slots
Aspects that should be taken into account to design slot-level channels/signals/procedures
Starting points for designing mini-slot-level channels/signals/procedures
Made agreements for numerology aspects, including
Support of ECP at least for 60kHz SCS which is realized by scaling LTE extended CP
Fractional PRB is not supported in Rel. 15
Made agreements for wider bandwidth operation, including
Maximum channel bandwidth per NR carrier is 400 MHz
Maximum number of NR carriers for CA and DC is 16
Outgoing LS on alternatives for a wider BW CC (R )
Made agreements for modulation, including
Supports 0.5*pi BPSK modulation for DFT-s-OFDM

24. New Radio Access Technology (cont.)
Channel coding
Working Assumptions from RAN1#87 regarding coding types have been confirmed
Agreements on LDPC code design:
Basic structure of at least one base graph
Largest supported information block size and shift size
Rate-matching
Transport block CRC
Agreements on Control Channel coding:
Polar code design
Maximum mother code sizes for DL and UL control information
Options for polar code structures, and plan for next steps
Coding for very small block lengths
Further evaluations required

25. New Radio Access Technology (cont.)
Duplex and interference management
Agreements on observations for flexible duplexing for indoor hotspot, urban macro and dense urban scenarios
Additional observations are agreed by discussion
Agreements on summary of interference management schemes along with analysis of specification impact
Made agreements for NR-LTE co-existence, including
Support of uplink sharing scenarios by LTE NR co-located base stations
Support of efficient adjacent channel co-existence w/ LTE-TDD UL-DL config #0-#5
Support of efficient adjacent channel co-existence w/ all the special subframe configurations
Both TR and TR were agreed and submitted to RAN for approval
Based on the study in RAN1, L1/L2 design target can be common as much as possible to achieve forward compatibility between Non-Standalone and Standalone

26. New Radio Channel Model
Agreement reached on channel modelling for single-band and multi-band simulations below and above 6 GHz – two alternatives provided for evaluations using either and , or 38.9xxx
will be replaced by a new TR (submitted to RAN#75 for approval), covering the frequency range 0.5 – 100 GHz
Various corrections agreed to channel model TRs , , and

27. UMTS Rel-14

28. UMTS CR
Agreed one CR related Clarification on the TTI switching for single cell E-DCH and dual cell E-DCH

29. Future RAN WG1 Planning

30. WG time budget analysis (1) - Current capacity in RAN1
For LTE,
Taking into account expected maintenance work and work for other WGs, RAN1 capacity for Rel-13/14 work in Q was allocated as “20 time units” per meeting
Total time units per day: about 4 TU
Time units for LTE CR: 3 TU
Maximum parallel LTE sessions per day: 2
The number of parallel sessions per week: 2.5 days
Keep 4 “reserve” time units not allocated, to provide flexibility to maximise productivity
For HSPA,
RAN1 capacity for HSPA work in Q was only allocated for maintenance time

31. WG time budget analysis (2) - Discussion time for Rel-14/15 LTE/NR SI/WIs
+98%
+1%
+4%
+0%

32. WG time budget analysis (3) - Future capacity in RAN1
Considering Rel-14 maintenance, RAN1 needs to have maintenance (CR) discussion time to 4 TU in Q2 2017
In addition, considering Rel-15 NR WI finalization in appropriate timing and Rel-15 NR SI existence, RAN1 can consider to decrease LTE TU a little bit from Q2 2017
Followings are one proposal about RAN1 TU allocation for Rel-15 LTE/NR in Q2 2017
(Ref.) Q1 2017
Q2 2017
Maintenance
3 TU
4 TU
LTE SI/WI
20 TU
17 TU
NR WI
22 TU
NR SI
24 TU
Total TU
47 TU

33. Rel-15 time budget requests: LTE
Following Rel-15 SI/WIs will be existed in Q2, 2017 based on past RAN approval

34. Rel-14 time budget requests: HSPA
No Rel-14 SI/WIs will be existed in Q2, 2017 based on past RAN approval
It means that RAN1 will have 10.0 TU for new Rel-15 SI/WIs in Q2, 2017

35. Concluding remarks
RAN1 specs for both LTE and HSPA up to and including Rel-13 are stable
Almost all Rel-14 LTE SI/WIs can be closed
All Rel-14 LTE RAN1 parts can be closed
Rel-14 NR SI can be closed
Thanks to:
Vice chairmen Wanshi Chen and Matthew Baker
Editors Stefan Parkvall (TS36.211), Brian Classon (TS36.212), Robert Love (TS36.213), Matthew Baker (TS36.201), and Asbjorn Grovlen (TS36.214) for their work
Daniel Larsson, Hanbyul Seo, Hui Tong, Johan Bergman, Matthew Webb, Philippe Sartori, Ruyue Li for chairing sessions
Patrick Merias for his always efficient support
Delegates for active and enthusiastic contributions
North American Friends and European Friends for meeting hosting