Physical downlink control channel monitoring method and apparatus
This application provides a physical downlink control channel monitoring method and an apparatus. The method includes: determining that a first monitoring capability of a terminal device is used to monitor a physical downlink control channels of a cell set of the terminal device, determining N non-overlapping time units of the cell set in one slot, where a start location of each of the N time units is based on a span of a cell in the cell set, and allocating the first monitoring capability in the cell set based on the N time units to separately monitor a physical downlink control channel of each cell in the cell set, so that in a carrier aggregation (CA) scenario, the terminal can monitor a physical downlink control channel at a granularity of a span.
1 . A physical downlink control channel (PDCCH) monitoring method by a terminal device, the method comprising:
determining that a first monitoring capability of the terminal device is used to monitor physical downlink control channels of a cell set comprising at least two cells of the terminal device, wherein each cell in the cell set has a same span pattern and a same subcarrier spacing, wherein the span pattern is represented as (X, Y), wherein X represents a minimum symbol spacing between start symbols of two spans, and wherein Y represents a maximum quantity of consecutive symbols comprised in the span;
determining N non-overlapping time units of the cell set in one slot, wherein a start location of each of the N non-overlapping time units is based on a span of a cell in the cell set, wherein N is a positive integer, and wherein the time unit is X symbols; and
allocating the first monitoring capability between the cells in the cell set in each of the N non-overlapping X symbols, to separately monitor PDCCHs of cells in the cell set,
wherein the allocating the first monitoring capability between the cells in the cell set meets the following condition in each of the N non-overlapping X symbols:
a sum of maximum monitoring times allocated to cells in the cell set is less than or equal to the maximum monitoring times allocated to the first cell set; and a sum of the maximum quantity of control channel elements (CCEs) allocated to the cells in the cell set is less than or equal to the maximum quantity of CCEs allocated to the first cell set.
2 . The method according to claim 1 , wherein the allocating of the first monitoring capability in the cell set in each of the N non-overlapping X symbols comprises:
allocating, in response to symbols being occupied by a first span of a first cell partially or completely overlap with a first X symbols, a part or all of the first monitoring capability to the first cell based on a quantity of all symbols occupied by a span of the first cell,
wherein the first cell is a cell in the cell set, and
wherein the first X symbols is one of the N non-overlapping X symbols.
3 . The method according to claim 1 , wherein the allocating of the first monitoring capability in the cell set in each of the N non-overlapping X symbols comprises:
allocating, in response to symbols being occupied by a span of a second cell partially or completely overlap with a second X symbols, a part or all of the first monitoring capability to the second cell based on a proportion of a quantity of symbols in an overlapping part in a quantity of symbols occupied by the span of the second cell,
wherein the second cell is a cell in the cell set, and
wherein the second X symbols is one of the N non-overlapping X symbols.
4 . The method according to claim 1 , wherein each span of each cell in the cell set is located in one of the N non-overlapping X symbols.
5 . The method according to claim 1 , wherein the first monitoring capability of the terminal device is determined based on a maximum quantity of cells supported by the terminal device to monitor a physical downlink control channel and a monitoring capability corresponding to a span pattern corresponding to the first cell set.
6 . A communication apparatus, comprising:
a memory storing instructions; and
at least one processor in communication with the memory, the at least one processor configured to execute the instructions, wherein upon execution of the instructions, the at least one processor performs a physical downlink control channel (PDCCH) monitoring method, the method comprising the following:
determining that a first monitoring capability of the terminal device is used to monitor physical downlink control channels of a cell set comprising at least two cells of the terminal device, wherein each cell in the cell set has a same span pattern and a same subcarrier spacing, wherein the span pattern is represented as (X, Y), wherein X represents a minimum symbol spacing between start symbols of two spans, and wherein Y represents a maximum quantity of consecutive symbols comprised in the span;
determining N non-overlapping time units of the cell set in one slot, wherein a start location of each of the N non-overlapping time units is based on a span of a cell in the cell set, wherein N is a positive integer, and wherein the time unit is X symbols; and
allocating the first monitoring capability between the cells in the cell set in each of the N non-overlapping X symbols, to separately monitor PDCCHs of cells in the cell set,
wherein the allocating the first monitoring capability between the cells in the cell set meets the following condition in each of the N non-overlapping X symbols:
a sum of maximum monitoring times allocated to cells in the cell set is less than or equal to the maximum monitoring times allocated to the first cell set; and a sum of the maximum quantity of control channel elements (CCEs) allocated to the cells in the cell set is less than or equal to the maximum quantity of CCEs allocated to the first cell set.
7 . The apparatus according to claim 6 , wherein the allocating of the first monitoring capability in the cell set in each of the N non-overlapping X symbols comprises:
allocating, in response to symbols being occupied by a first span of a first cell partially or completely overlap with a first X symbols, a part or all of the first monitoring capability to the first cell based on a quantity of all symbols occupied by a span of the first cell, wherein the first cell is a cell in the cell set, and wherein the first X symbols is one of the N non-overlapping X symbols.
8 . The apparatus according to claim 6 , wherein the allocating of the first monitoring capability in the cell set in each of the N non-overlapping X symbols comprises:
allocating, in response to symbols being occupied by a span of a second cell partially or completely overlap with the second X symbols, a part or all of the first monitoring capability to the second cell based on a proportion of a quantity of symbols in an overlapping part in a quantity of symbols occupied by the span of the second cell, wherein the second cell is a cell in the cell set, and wherein the second X symbols is one of the N non-overlapping X symbols.
9 . The apparatus according to claim 6 , wherein each span of each cell in the cell set is located in one of the N non-overlapping X symbols.
10 . The apparatus according to claim 6 , wherein the first monitoring capability of the terminal device is determined based on a maximum quantity of cells supported by the terminal device to monitor a physical downlink control channel and a monitoring capability corresponding to a span pattern corresponding to the first cell set.
11 . A non-transitory computer-readable medium having stored thereon, a computer program comprising at least one code section for distributing data, the at least one code section being executable by a terminal device for causing the terminal device to perform a physical downlink control channel (PDCCH) monitoring method, the method comprising the following:
determining that a first monitoring capability of the terminal device is used to monitor physical downlink control channels of a cell set comprising at least two cells of the terminal device, wherein each cell in the cell set has a same span pattern and a same subcarrier spacing, wherein the span pattern is represented as (X, Y), wherein X represents a minimum symbol spacing between start symbols of two spans, and wherein Y represents a maximum quantity of consecutive symbols comprised in the span;
determining N non-overlapping time units of the cell set in one slot, wherein a start location of each of the N non-overlapping time units is based on a span of a cell in the cell set, wherein N is a positive integer, and wherein the time unit is X symbols; and
allocating the first monitoring capability between the cells in the cell set in each of the N non-overlapping X symbols, to separately monitor PDCCHs of cells in the cell set,
wherein the allocating the first monitoring capability between the cells in the cell set meets the following condition in each of the N non-overlapping X symbols:
a sum of maximum monitoring times allocated to cells in the cell set is less than or equal to the maximum monitoring times allocated to the first cell set; and a sum of the maximum quantity of control channel elements (CCEs) allocated to the cells in the cell set is less than or equal to the maximum quantity of CCEs allocated to the first cell set.
12 . The non-transitory computer-readable medium according to claim 11 , wherein the allocating of the first monitoring capability in the cell set in each of the N non-overlapping X symbols comprises:
allocating, in response to symbols being occupied by a first span of a first cell partially or completely overlap with a first X symbols, a part or all of the first monitoring capability to the first cell based on a quantity of all symbols occupied by a span of the first cell,
wherein the first cell is a cell in the cell set, and
wherein the first X symbols is one of the N non-overlapping X symbols.
13 . The non-transitory computer-readable medium according to claim 11 , wherein the allocating of the first monitoring capability in the cell set in each of the N non-overlapping X symbols comprises:
allocating, in response to symbols being occupied by a span of a second cell partially or completely overlap with a second X symbols, a part or all of the first monitoring capability to the second cell based on a proportion of a quantity of symbols in an overlapping part in a quantity of symbols occupied by the span of the second cell,
wherein the second cell is a cell in the cell set, and
wherein the second X symbols is one of the N non-overlapping X symbols.
14 . The non-transitory computer-readable medium according to claim 11 , wherein each span of each cell in the cell set is located in one of the N non-overlapping X symbols.
15 . The non-transitory computer-readable medium according to claim 11 , wherein the first monitoring capability of the terminal device is determined based on a maximum quantity of cells supported by the terminal device to monitor a physical downlink control channel and a monitoring capability corresponding to a span pattern corresponding to the first cell set.