Multi-slot physical layer downlink control channel (PDCCH) monitoring
A user equipment (UE) performs multi-slot physical downlink control channel (PDCCH) monitoring. The UE receives a search space configuration from a network node. The UE determines a search space monitoring slot within a first X-slot group of a fixed pattern of X-slot groups based on a location of the first slot of type0 Common Search Space (CSS) monitoring occasions. The UE determines which one or more slot indices to monitor. The UE determines which one or more symbols to monitor within the determined one or more slot indices. The UE monitors the determined symbols within the determined slot indices for PDCCH.
1 . A method performed by a user equipment (UE) for multi-slot physical downlink control channel (PDCCH) monitoring, the method comprising:
receiving a search space configuration from a network node;
determining a search space monitoring slot within a first X-slot group of a fixed pattern of X-slot groups based on a location of a first slot of type0 Common Search Space (CSS) monitoring occasions;
determining which one or more slot indices to monitor;
determining which one or more symbols to monitor within the determined one or more slot indices; and
monitoring the determined one or more symbols within the determined one or more slot indices for PDCCH.
2 . The method of claim 1 , wherein the fixed pattern of X-slot groups is common to all user equipments (UEs), and wherein a location of Y slot(s) within an X-slot group can be different for different UEs based on a preferred SS/PBCH block index determined by each UE.
3 . The method of claim 2 , further comprising:
determining a start of the fixed pattern of X-slot groups based on a location of a first slot of a frame or a subframe.
4 . The method of claim 1 , further comprising:
receiving an instruction from the network node to change a type0 PDCCH monitoring location;
determining a new value for the determined search space monitoring slot; and
determining which one or more slot indices to monitor according to the determined new value for the determined search space monitoring slot.
5 . The method of claim 1 , further comprising:
autonomously determining a new type0 PDCCH monitoring location during a random access procedure (RACH) including determining a new value of n 0 based on a preferred SS/PBCH block detected by the UE that is associated with a random access occasion (RO) used by the UE during the RACH procedure.
6 . The method of claim 1 , wherein a location of Y slot(s) within an X-slot group is located at the beginning of that X-slot group, and wherein a location of the X-slot groups can be different for different UEs based on a preferred SS/PBCH block index determined by each UE.
7 . The method of claim 1 , further comprising:
determining a start of the fixed pattern of X-slot groups based on a location of a first slot of type0 CSS monitoring occasions.
8 . The method of claim 6 , further comprising:
receiving an instruction from the network node to change a type0 PDCCH monitoring location; and
determining which one or more slot indices to monitor for all search spaces according to a new first slot of a type0 CSS monitoring occasion.
9 . The method of claim 1 , wherein the search space configuration includes:
a period in terms of X-slot groups;
an offset in terms of X-slot groups within the period;
a duration in terms of X-slot groups within the period; and
a parameter that indicates which one or more symbols to monitor within a slot.
10 . The method of claim 9 , wherein determining which one or more slot indices to monitor is defined by the equation:
(
period
*
p
+
offset
+
y
)
*
X
+
n
0
modulo
X
wherein y=0, 1, . . . , (duration−1); wherein p=0, 1, 2, . . . .
11 . The method of claim 1 , further comprising:
wherein the search space configuration includes:
a first period in terms of slots,
a first offset in terms of slots,
a first duration in terms of slots, and
a parameter that indicates which one or more symbols to monitor within a slot;
determining a reinterpreted search space configuration including determining a second period, a second offset, and second duration, in terms of X-slot groups as a floor (period/X), floor (offset/X), and floor (duration/X) respectively; and
wherein determining the which one or more slot indices to monitor is based on the reinterpreted search space configuration.
12 . The method of claim 11 , wherein determining which one or more slot indices to monitor is defined by the equation:
(
second
period
*
p
+
second
offset
+
y
)
*
X
+
n
0
modulo
X
wherein y=0, 1, . . . , (second duration−1); wherein p=0, 1, 2, . . . .
13 . The method of claim 9 , wherein determining which one or more symbols to monitor within the determined one or more slot indices based on the received search space configuration includes applying the parameter that indicates which one or more symbols to monitor within a slot to each of the determined one or more slot indices.
14 . The method of claim 9 , wherein the search space configuration further includes:
an additional offset in terms of X-slot groups within the period, and wherein determining which one or more slot indices to monitor the search space accounts for the additional offset.
15 . A user equipment configured for multi-slot physical downlink control channel (PDCCH) monitoring, comprising:
a communication interface; and
processing circuitry in communication with the communication interface and configured to perform operations comprising:
receiving a search space configuration from a network node;
determining a search space monitoring slot within a first X-slot group of a fixed pattern of X-slot groups based on a location of a first slot of type0 Common Search Space (CSS) monitoring occasions;
determining which one or more slot indices to monitor;
determining which one or more symbols to monitor within the determined one or more slot indices; and
monitoring the determined one or more symbols within the determined one or more slot indices for PDCCH.
16 . The user equipment of claim 15 , wherein the operations further comprise:
determining a start of the fixed pattern of X-slot groups based on a location of a first slot of a frame or a subframe.
17 . The user equipment of claim 15 , wherein the operations further comprise:
receiving an instruction from the network node to change a type0 PDCCH monitoring location;
determining a new value for the determined search space monitoring slot; and
determining which one or more slot indices to monitor according to the determined new value for the determined search space monitoring slot.
18 . The user equipment of claim 15 , wherein the operations further comprise:
autonomously determining a new type0 PDCCH monitoring location during a random access procedure (RACH) including determining a new value of no based on a preferred SS/PBCH block detected by the UE that is associated with a random access occasion (RO) used by the UE during the RACH procedure.
19 . The user equipment of claim 15 , wherein a location of Y slot(s) within an X-slot group is located at the beginning of that X-slot group, and wherein a location of the X-slot groups can be different for different UEs based on a preferred SS/PBCH block index determined by each UE.
20 . The user equipment of claim 15 , wherein the operations further comprise:
determining a start of the fixed pattern of X-slot groups based on a location of a first slot of type0 CSS monitoring occasions.