1. WF on 4Tx UL Codebook For CP-OFDM
3GPP TSG RAN1 #91
Reno, USA, November 27th – December 1st, 2017
Agenda item –
R1-17nnnnn
WF on 4Tx UL Codebook For CP-OFDM

2. Background
Partial coherence/full coherence is a UE capability. The only coherence category with guaranteed support from every UE is “non-coherence”.
It is imperative that NR UL MIMO not depending on UE capability/optional feature is robustly supported.
Codebook design for non-coherence is of high importance and should not be compromised.

3. Overview (1) # Precoders vs. Coherence transmission Capability
Transmission Rank
Full Coherence
Partially Coherent
Non Coherent
Rank 1 16 8 4
Rank 2 6
Rank 3
Rank 4 1

4. Overview (2) Total Number of codewords and signaling overhead
according to Coherence Transmission Capability
and Rank restriction
With rank restriction
Full Coherence
Partially Coherent
Non Coherent
Rank 1
28 (5 bits)
12 (4 bits)
4 (2 bits)
Ranks 1-2
50 (6 bits)
26 (5 bits)
10 (4 bits)
Ranks 1-3
58 (6 bits)
30 (5 bits)
14 (4 bits)
Ranks 1-4
63 (6 bits)
31 (5 bits)
15 (4 bits)

5. Proposal: Rank 1

6. Proposal: Rank 2

7. Proposal: Rank 3

8. Proposal: Rank 4