1. Illustration of RMSI monitoring windows (TDM)
3GPP TSG RAN WG1#91 R1-17XXXXX
Reno, USA, November 27th – December 1st, 2017
Agenda item:
Illustration of RMSI monitoring windows (TDM)
ZTE

2. Background Complete Offline agreement: monitoring window position
When the SS/PBCH blocks and corresponding RMSI CORESETs occur in different time instances,
Configuration of the RMSI CORESET monitoring window
The monitoring window is associated with one SS/PBCH block in a burst set
monitoring window position
The starting slot index S for the monitoring window with reference to the SFN boundary for SSB i is S = X + O + f(i), where slot is defined by RMSI numerology
Alt1: f(i) = floor(i/N),
Alt2: f(i) = floor(i*M)
M equals 1/2, if N=2; M = 1 or 2, if N=1;
Here, X is the number of slots corresponding to half frame starting boundary containing the SSB
Ex) X = 0 if the first half frame includes the SSB
Ex) X = 5k if the second half frame includes the SSB and SCS is 15k kHz, k = 1, 2, 4, 8
i is the SSB index
O is the number of slots corresponding to
{0, 2, 5} msec for sub6GHz
{0,2.5, 5} msec for over6GHz
N is the number of search space sets per slot, {1, 2}
When N = 1, the starting symbol for the CORESET is 0 except for the 30kHz SSB SCS/15kHz RMSI SCS LTE-NR coexistence case, in which case the symbol number is 2.
When N = 2, the starting symbol for the CORESETs will be
Option 1: {0,l} where l ={1,2} is the CORESET duration, for the 30kHz SSB SCS/15kHz RMSI SCS LTE-NR coexistence case, in which case the starting symbol number is 2
Option 2: {0,7}
monitoring window duration 2 slots

3. Parts of Offline agreement
The starting slot index S for the monitoring window with reference to the SFN boundary for SSB i is
S = X + O + f(i),
where slot is defined by RMSI numerology
Alt1: f(i) = floor(i/N),
Alt2: f(i) = floor(i*M)
M = ½, if N=2;
M = {1, 2}, if N=1;
X is the number of slots corresponding to half frame starting boundary containing the SSB
i is the SSB index
O is the number of slots
N is the number of search space sets per slot, {1, 2}
monitoring window duration = 2 slots

4. N=2 (2 search space sets per slot)
f(i) = floor(i/N) = floor(i*M) = floor(i/2)
f(0)=0
f(1)=0
f(2)=1
f(3)=1
f(4)=2
f(5)=2
One search space set for SSBs 3 or 5
i = 0
i = 1
i=0, 2
i=1,3
i=2,4
i=3,5
i=4,6
i=5,6
...
~One search space
set per SSB
Monitoring window for
SSB i=0 and SSB i=1 (2 slots)
Monitoring window for
SSB i=2 and SSB i=3 (2 slots)
Monitoring window for
SSB i=4 and SSB i=5 (2 slots)
Alt 1 is equal to Alt 2
for N=2.
...

5. Alt 1 is equal to Alt 2 for N=1, M=1.
f(i) = floor(i/N) = floor(i*M) = i
One search space set for
SSB i=2 or SSB i=3
f(0)=0
f(1)=0
f(2)=0
f(3)=0
i = 0
i = 0,1
i = 1,2
i = 2,3
...
~One search space
set per SSB
Monitoring window for SSB i=0 (2 slots)
Monitoring window for SSB i=1 (2 slots)
Monitoring window for SSB i=2 (2 slots)
...
Alt 1 is equal to Alt 2 for N=1, M=1.

6. N=1, M=2 ... Only supported by Alt 2 f(i) = floor(i*M) = i*2
Monitoring window for SSB i=0
(2 slots)
Monitoring window for SSB i=1
(2 slots)
Two search space sets per SSB 
NW scheduling flexibility
Only supported by Alt 2