1. WF on new NR CG sequences for PUCCH
3GPP TSG RAN WG1 Meeting #90-bis R
Prague, Czech Republic, 9th – 13th October 2017
Agenda item:
WF on new NR CG sequences for PUCCH
Intel Corporation, Qualcomm Inc., Huawei, HiSilicon, CATT, KT Corporation, WILUS Inc., Acorn Technologies, Samsung

2. Background Agreement (NR-AdHoc3)
NR studies a new set of sequences for short PUCCH and long PUCCH for UCI bits up to 2
For a fair comparison of at least length 12 NR CGS designs for PUCCH, the companies are encouraged to provide/re-evaluate their proposed sequences based on the following all or a subset of performance metrics
Maximum PAPR/CM, minimum PAPR/CM, mean PAPR/CM (assuming at least 8x oversampling)
Maximum cross-correlation
Between the base sequences for new NR sequences by applying all CS values
Between the base sequences for new NR and LTE sequences by applying all CS values (LTE CGS for 1 and 2 PRBs ,and ZC sequences for >2PRBs up to 100MHz bandwidth) considering all partial overlapping
LTE CGS are used as the reference for performance comparison

3. Background This WF proposes a set of length-12 base sequences
Key Properties
Same alphabet as in LTE (i.e. QPSK) – low complexity implementation, proven waveform
Lower PAPR / CM than LTE 1PRB CG sequence set
Comparable cross-correlation within new NR CG set to LTE 1PRB CG sequence set
Low cross-correlation with LTE 1PRB CG sequence set

4. Proposal The following set of new NR CG sequences is specified
rk(n) = exp(jk(n)/4)
Seq. Index  1 -1 3 -3 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

5. Performance Analysis Analysis of CM and PAPR statistics
Proposed set of sequences provides superior performance in terms of PAPR and CM statistics

6. Performance Analysis Analysis of cyclic cross-correlation properties
Proposed set of sequences has the similar cross-correlation properties as LTE and has low cross-correlation with LTE set