Physical downlink control channel repetition method and apparatus, and user equipment
A physical downlink control channel repetition method and apparatus, and user equipment are provided. The PDCCH repetition method according to embodiments of this application includes: in a case that UE has received information for PDCCH repetition, determining, by the UE, X PDCCH candidates of repetition, X being an integer greater than 1; and executing, by the UE, an overbooking rule based on an assumed first blind decoding count on the X PDCCH candidates, or executing, by the UE, a target operation based on a time domain resource of a target PDCCH candidate; where search spaces corresponding to the X PDCCH candidates are associated with each other, and the target PDCCH candidate is a PDCCH candidate satisfying a predetermined condition in the X PDCCH candidates.
1 . A physical downlink control channel (PDCCH) repetition method, wherein the method comprises:
in a case that any one of X physical downlink control channel (PDCCH) candidates received by a user equipment (UE) satisfies a first condition, determining, by the UE, that the X PDCCH candidates as a repetition transmission, wherein X is an integer greater than 1, and the first condition comprises: a time-frequency resource of any one of the X PDCCH candidates overlaps a target time-frequency resource; and
determining, by the UE, a blind decoding count for the X PDCCH candidates for the repetition transmission based on an assumed first blind decoding count on the X PDCCH candidates; wherein
search spaces corresponding to the X PDCCH candidates are associated with each other;
the target time-frequency resource comprises any one of the following: time-frequency resource for synchronization signal block SSB, time-frequency resource for cell-specific reference signal (CRS) configured via higher layer, time-frequency resource on which rate matching is implemented for other physical downlink shared channels (PDSCHs), and unusable time-frequency resource configured via higher layer.
2 . The method according to claim 1 , wherein the first blind decoding count is determined based on any one of the following:
a default assumed blind decoding count for demodulating PDCCH repetition;
a blind decoding count reported by the UE for demodulating PDCCH repetition; and
a blind decoding count determined by a network-side device based on the blind decoding count reported by the UE for demodulating PDCCH repetition.
3 . The method according to claim 1 , wherein the determining, by the UE, a blind decoding count for the X PDCCH candidates for the repetition transmission based on an assumed first blind decoding count on the X PDCCH candidates comprises:
determining, by the UE, the blind decoding count for the X PDCCH candidates for the repetition transmission based on the first blind decoding count and according to a predetermined rule.
4 . The method according to claim 3 , wherein the predetermined rule comprises any one of the following:
each PDCCH candidate in the X PDCCH candidates is associated with a different search space; and
for a PDCCH candidate associated with a search space with a small index value, counting is based on a third blind decoding count, and for a PDCCH candidate associated with a search space with a large index value, counting is based on a fourth blind decoding count, wherein
the fourth blind decoding count is greater than or equal to the third blind decoding count.
5 . The method according to claim 4 , wherein in a case that all PDCCH candidates in the X PDCCH candidates are transmitted in one same transmission unit and the X PDCCH candidates do not completely overlap in terms of time domain resource,
the last symbol of a PDCCH candidate associated with a search space with a larger index value is later than the last symbol of a PDCCH candidate associated with a search space with a smaller index value; or
the 1st symbol of a PDCCH candidate associated with a search space with a larger index value is later than the 1st symbol of a PDCCH candidate associated with a search space with a smaller index value.
6 . The method according to claim 3 , wherein the predetermined rule comprises any one of the following:
in a case that the first blind decoding count is equal to X, one blind decoding is counted for each PDCCH candidate, and if the X-th blind decoding exceeds a blind decoding capability reported by the UE, X−1 blind decodings are counted for the PDCCH repetitions; and
in a case that the first blind decoding count is equal to X, one blind decoding is counted for each PDCCH candidate, and if the X-th blind decoding does not exceed the blind decoding capability reported by the UE, X blind decodings are counted for the PDCCH repetitions; wherein the X-th blind decoding involves combining soft bit information corresponding to the X PDCCH candidates and performing blind decoding on the combined soft bit information,
the blind decoding performed on the combined soft bit information is associated with a first search space, and
the first search space is a predetermined specific search space or a specific search space configured by a network-side device, and the first search space is used for blind decoding on the combined soft bit information.
7 . The method according to claim 1 , wherein
M search space association groups are transmitted in one same transmission unit, each search space association group comprises X search spaces, and the X search spaces are in one-to-one correspondence to the X PDCCH candidates;
each search space association group comprises K PDCCH candidate sets, and each PDCCH candidate set comprises X PDCCH candidates; and
a total quantity of PDCCH candidate sets transmitted in one transmission unit is H; wherein
a value of M is determined by any one of the following: a preset value and a value determined by a network-side device based on a capability reported by the UE; a value of K is determined by any one of the following: a preset value and a value determined by the network-side device based on the capability reported by the UE; and a value of H is determined by any one of the following: a preset value and a value determined by the network-side device based on the capability reported by the UE.
8 . The method according to claim 1 , wherein after the determining, by the UE, a blind decoding count for the X PDCCH candidates for the repetition transmission based on an assumed first blind decoding count on the X PDCCH candidates, the method further comprises:
in a case that a second condition is satisfied, monitoring, by the UE, the X PDCCH candidates and Y PDCCH candidates, wherein
the second condition comprises: the UE has reported a target capability, the Y PDCCH candidates are not used for PDCCH repetition, the Y PDCCH candidates are associated with different receive beams, and time domain resources of the Y PDCCHs overlap,
the target capability being a capability of the UE to simultaneously receive PDCCH candidates associated with different beams.
9 . A PDCCH repetition method, wherein the method comprises:
transmitting, by a network-side device, X PDCCH candidates of repetition to UE; and
transmitting, by the network-side device, an assumed first blind decoding count on the X PDCCH candidates to the UE;
wherein in a case that any one of the X PDCCH candidates satisfies a first condition, the X PDCCH candidates are determined as a repetition transmission, X being an integer greater than 1, and the first condition comprises: a time-frequency resource of any one of the X PDCCH candidates overlaps a target time-frequency resource;
wherein the assumed first blind decoding count on the X PDCCH candidates is used for the UE to determine a blind decoding count for the X PDCCH candidates for the repetition transmission;
wherein search spaces corresponding to the X PDCCH candidates are associated with each other;
the target time-frequency resource comprises any one of the following: time-frequency resource for synchronization signal block SSB, time-frequency resource for cell-specific reference signal (CRS) configured via higher layer, time-frequency resource on which rate matching is implemented for other physical downlink shared channels (PDSCHs), and unusable time-frequency resource configured via higher layer.
10 . The method according to claim 9 , wherein before the transmitting, by the network-side device, an assumed first blind decoding count on the X PDCCH candidates to the UE, the method further comprises:
receiving, by the network-side device, a blind decoding count reported by the UE for decoding PDCCH repetition; and
determining, by the network-side device, the first blind decoding count based on the blind decoding count for decoding PDCCH repetition.
11 . UE, comprising a processor, a memory, and a program or instructions stored in the memory and capable of running on the processor, wherein when the program or instructions are executed by the processor, the process is caused to implement:
in a case that any one of X physical downlink control channel (PDCCH) candidates received by a user equipment (UE) satisfies a first condition, determining, by the UE, that the X PDCCH candidates as a repetition transmission, wherein X is an integer greater than 1, and the first condition comprises: a time-frequency resource of any one of the X PDCCH candidates overlaps a target time-frequency resource; and
determining, by the UE, a blind decoding count for the X PDCCH candidates for the repetition transmission based on an assumed first blind decoding count on the X PDCCH candidates; wherein
search spaces corresponding to the X PDCCH candidates are associated with each other;
the target time-frequency resource comprises any one of the following: time-frequency resource for synchronization signal block SSB, time-frequency resource for cell-specific reference signal (CRS) configured via higher layer, time-frequency resource on which rate matching is implemented for other physical downlink shared channels (PDSCHs), and unusable time-frequency resource configured via higher layer.
12 . The UE according to claim 11 , wherein the first blind decoding count is determined based on any one of the following:
a default assumed blind decoding count for demodulating PDCCH repetition;
a blind decoding count reported by the UE for demodulating PDCCH repetition; and
a blind decoding count determined by a network-side device based on the blind decoding count reported by the UE for demodulating PDCCH repetition.
13 . The UE according to claim 11 , wherein the determining, by the UE, a blind decoding count for the X PDCCH candidates for the repetition transmission based on an assumed first blind decoding count on the X PDCCH candidates comprises:
determining, by the UE, the blind decoding count for the X PDCCH candidates for the repetition transmission based on the first blind decoding count and according to a predetermined rule.
14 . The UE according to claim 13 , wherein the predetermined rule comprises any one of the following:
each PDCCH candidate in the X PDCCH candidates is associated with a different search space; and
for a PDCCH candidate associated with a search space with a small index value, counting is based on a third blind decoding count, and for a PDCCH candidate associated with a search space with a large index value, counting is based on a fourth blind decoding count, wherein
the fourth blind decoding count is greater than or equal to the third blind decoding count.
15 . The UE according to claim 14 , wherein in a case that all PDCCH candidates in the X PDCCH candidates are transmitted in one same transmission unit and the X PDCCH candidates do not completely overlap in terms of time domain resource,
the last symbol of a PDCCH candidate associated with a search space with a larger index value is later than the last symbol of a PDCCH candidate associated with a search space with a smaller index value; or
the 1st symbol of a PDCCH candidate associated with a search space with a larger index value is later than the 1st symbol of a PDCCH candidate associated with a search space with a smaller index value.
16 . The UE according to claim 13 , wherein the predetermined rule comprises any one of the following:
in a case that the first blind decoding count is equal to X, one blind decoding is counted for each PDCCH candidate, and if the X-th blind decoding exceeds a blind decoding capability reported by the UE, X−1 blind decodings are counted for the PDCCH repetitions; and
in a case that the first blind decoding count is equal to X, one blind decoding is counted for each PDCCH candidate, and if the X-th blind decoding does not exceed the blind decoding capability reported by the UE, X blind decodings are counted for the PDCCH repetitions;
wherein the X-th blind decoding involves combining soft bit information corresponding to the X PDCCH candidates and performing blind decoding on the combined soft bit information,
the blind decoding performed on the combined soft bit information is associated with a first search space, and
the first search space is a predetermined specific search space or a specific search space configured by a network-side device, and the first search space is used for blind decoding on the combined soft bit information.
17 . The UE according to claim 11 , wherein
M search space association groups are transmitted in one same transmission unit, each search space association group comprises X search spaces, and the X search spaces are in one-to-one correspondence to the X PDCCH candidates;
each search space association group comprises K PDCCH candidate sets, and each PDCCH candidate set comprises X PDCCH candidates; and
a total quantity of PDCCH candidate sets transmitted in one transmission unit is H; wherein
a value of M is determined by any one of the following: a preset value and a value determined by a network-side device based on a capability reported by the UE; a value of K is determined by any one of the following: a preset value and a value determined by the network-side device based on the capability reported by the UE; and a value of H is determined by any one of the following: a preset value and a value determined by the network-side device based on the capability reported by the UE.
18 . The UE according to claim 11 , wherein after the determining, by the UE, a blind decoding count for the X PDCCH candidates for the repetition transmission based on an assumed first blind decoding count on the X PDCCH candidates, the process is further caused to implement:
in a case that a second condition is satisfied, monitoring, by the UE, the X PDCCH candidates and Y PDCCH candidates, wherein
the second condition comprises: the UE has reported a target capability, the Y PDCCH candidates are not used for PDCCH repetition, the Y PDCCH candidates are associated with different receive beams, and time domain resources of the Y PDCCHs overlap,
the target capability being a capability of the UE to simultaneously receive PDCCH candidates associated with different beams.