# US 2021/0282001 A1 · Blind detection and control channel element monitoring limits in carrier aggregation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0282001 A1 - Document ID: US20210282001A1 - Status: Published application - Kind: A1 - Application number: 17/062,498 - Filed: 2020-10-02 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Hamid Saber; Jung Hyun Bae - Web page: https://patentgrep.com/patent/US20210282001A1 ## CPC - H04W 8/24: Transfer of terminal data - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A system and method for setting blind detection and control channel element monitoring limits in a carrier aggregation scheme. In some embodiments, the method includes: receiving, by a network from a first user equipment (UE), a declaration of capabilities of the first UE; sending, by the network, to the first UE, a first search space (SS) configuration for a first component carrier in a carrier aggregation (CA) scheme; and sending, by the network, to the first UE, a second search space configuration for a second component carrier in the carrier aggregation scheme. The first search space configuration may define a first set of monitoring occasions, the second search space configuration may define a second set of monitoring occasions (MOs), and an aligned span pattern, corresponding to the first set of monitoring occasions and the second set of monitoring occasions, may comply with the declaration of capabilities of the first UE. ## Claims ### Claim 1 A method, comprising: receiving, by a network from a first user equipment (UE), a declaration of capabilities of the first UE; sending, by the network, to the first UE, a first search space (SS) configuration for a first component carrier in a carrier aggregation (CA) scheme; and sending, by the network, to the first UE, a second search space configuration for a second component carrier in the carrier aggregation scheme, wherein: the first search space configuration defines a first set of monitoring occasions, the second search space configuration defines a second set of monitoring occasions (MOs), and an aligned span pattern, corresponding to the first set of monitoring occasions and the second set of monitoring occasions, complies with the declaration of capabilities of the first UE. ### Claim 2 (depends on 1) The method of claim 1, wherein the aligned span pattern is a span pattern corresponding to the union of the first set of monitoring occasions and the second set of monitoring occasions. ### Claim 3 (depends on 2) The method of claim 2, wherein the total number of PDCCH candidates in the first set of monitoring occasions and the second set of monitoring occasions is at most equal to a maximum number of PDCCH candidates, the maximum number of PDCCH candidates being based on: the number of serving cells configured with span-based monitoring capability, a specified constant, and a number of downlink cells with span-based monitoring capability with which the UE is configured. ### Claim 4 (depends on 3) The method of claim 3, wherein the maximum number of PDCCH candidates MPCCHtotal,(X,Y), μ is equal to ⌊ N cells cap - r ⁢ ⁢ 16 × M PDCCH max , ( X , Y ) ⁢ μ × N cells , r ⁢ ⁢ 16 D ⁢ L , ( X , Y ) , μ ∑ μ ⁢ N cells , r ⁢ ⁢ 16 D ⁢ L , μ ⌋ wherein: Ncellscap-r16 is the reference number of serving cells with span-based monitoring capability and is included in the declaration of capabilities of the first UE, MPDCCHmax,(X,Y),μ is the specified constant, and Ncells,r16DL,(X,Y),μ is the number of downlink cells with span-based monitoring capability with which the UE is configured. ### Claim 5 (depends on 2) The method of claim 2, wherein: the first set of monitoring occasions and the second set of monitoring occasions together include a plurality of control channel elements (CCEs), and the number of control channel elements is at most equal to a maximum number of control channel elements, the maximum number of control channel elements being based on: the number of serving cells configured with span-based monitoring capability, a specified constant, and a number of downlink cells with span-based monitoring capability with which the UE is configured. ### Claim 6 (depends on 5) The method of claim 5, wherein the maximum number of control channel elements is equal to C PDCCH total , ( X , Y ) , μ = ⌊ N cells cap - r ⁢ ⁢ 16 × C PDCCH max , ( X , Y ) , μ × N cells , r ⁢ ⁢ 16 D ⁢ L , ( X , Y ) , μ ∑ μ ⁢ N cells , r ⁢ ⁢ 16 D ⁢ L , μ ⌋ wherein: Ncellscap-r16 is the reference number of serving cells with span-based monitoring capability and is included in the declaration of capabilities of the first UE, CPDCCHmax,(X,Y),μ is the specified constant, and Ncells,r16DL,(X,Y),μ is a number of downlink cells with span-based monitoring capability with which the UE is configured. ### Claim 7 (depends on 1) The method of claim 1, further comprising receiving, by the network from a second user equipment (UE), a declaration of capabilities of the second UE; sending, by the network, to the second UE, a third search space configuration for the first component carrier; and sending, by the network, to the second UE, a fourth search space configuration for the second component carrier, wherein: the third search space configuration defines a third set of monitoring occasions, the fourth search space configuration defines a fourth set of monitoring occasions (MOs), and a span pattern corresponding to the third set of monitoring occasions is not aligned with a span pattern corresponding to the fourth set of monitoring occasions. ### Claim 8 (depends on 1) The method of claim 1, wherein the third search space configuration includes at most MPDCCHtotal,(X,Y),μ PDCCH candidates, wherein MPDCCHtotal,(X,Y),μ is based on the declaration of capabilities of the second UE. ### Claim 9 (depends on 1) The method of claim 1, wherein the third search space configuration includes at most CPDCCHtotal,(X,Y),μ control channel elements, wherein CPDCCHtotal,(X,Y),μ is based on the declaration of capabilities of the second UE. ### Claim 10 (depends on 1) The method of claim 1, wherein: the declaration of capabilities of the first UE includes: a first span-gap span-length pair, and a second span-gap span-length pair; the method further comprises: determining a first span pattern for the first span-gap span-length pair and for the first set of monitoring occasions, the first span pattern being the span pattern assuming the span-gap span-length pair, that includes a first set of control resource sets and a first set of search spaces; determining that the first span pattern is valid for the first span-gap span-length pair; determining a second span pattern for the second span-gap span-length pair and for the first set of monitoring occasions, the second span pattern being the span pattern assuming the span-gap span-length pair, that includes the first set monitoring occasions; and determining that the first span pattern is valid for the first span-gap span-length pair. ### Claim 11 (depends on 10) The method of claim 10, further comprising: determining that the first span-gap span-length pair corresponds to a first specified constant, the first specified constant specifying a maximum number of monitored PDCCH candidates; and determining that the second span-gap span-length pair corresponds to a second specified constant, the first specified constant specifying a maximum number of monitored PDCCH candidates, the second specified constant being greater than the first specified constant. ### Claim 12 (depends on 10) The method of claim 10, further comprising: determining that the first span-gap span-length pair corresponds to a first specified constant, the first specified constant specifying a maximum number of non-overlapping control channel elements; and determining that the second span-gap span-length pair corresponds to a second specified constant, the first specified constant specifying a maximum number of non-overlapping control channel elements, the second specified constant being greater than the first specified constant. ### Claim 13 (depends on 1) The method of claim 1, further comprising: instructing, by the network, the UE to transition to a bandwidth part not supporting span-based PDCCH monitoring, and sending, by the network, to the UE, a third search space configuration, the third search space configuration being a search space configuration for slot-based PDCCH monitoring. ### Claim 14 (depends on 1) The method of claim 1, wherein: the aligned span pattern comprises: a first span pattern for the first search space configuration, and a second span pattern for the second search space configuration, and every two spans: have the same starting and ending symbols, or have a time gap, between the start of the two spans, equal to or greater than a span-gap element of a span-gap span-length pair of the declaration of capabilities of the first UE. ### Claim 15 (depends on 1) The method of claim 1, wherein: the aligned span pattern comprises: a first span pattern for the first search space configuration, and a second span pattern for the second search space configuration, and every two spans: have the same starting symbols, or have a time gap, between the start of the two spans, equal to or greater than a span-gap element of a span-gap span-length pair of the declaration of capabilities of the first UE. ### Claim 16 (depends on 1) The method of claim 1, wherein: the aligned span pattern comprises: a first span pattern for the first search space configuration, and a second span pattern for the second search space configuration, and every two spans: have the same ending symbols, or have a time gap, between the start of the two spans, equal to or greater than a span-gap element of a span-gap span-length pair of the declaration of capabilities of the first UE. ### Claim 17 (depends on 1) The method of claim 1, wherein: the aligned span pattern comprises: a first span pattern for the first search space configuration, and a second span pattern for the second search space configuration, and every two spans: have the same starting symbols, or have the same ending symbols, or have a time gap, between the start of the two spans, equal to or greater than a span-gap element of a span-gap span-length pair of the declaration of capabilities of the first UE. ### Claim 18 (depends on 1) The method of claim 1, comprising: sending, by the network, a set of slots comprising: in a first slot of the set of slots, the aligned span pattern corresponding to the first set of monitoring occasions and the second set of monitoring occasions, and one or more unaligned slots, wherein: the longest set of consecutive aligned slots within the set of slots includes fewer than P slots, and P is a specified constant greater than 3 and less than 100. ### Claim 19 A system comprising a user equipment (UE), the UE comprising a processing circuit configured to: send, to a network, a declaration of capabilities of the UE; receive, from the network, a first search space configuration for a first component carrier in a carrier aggregation (CA) scheme; and receive, from the network, a second search space configuration for a second component carrier in the carrier aggregation scheme, wherein: the first search space configuration defines a first set of monitoring occasions, the second search space configuration defines a second set of monitoring occasions (MOs), and an aligned span pattern, corresponding to the first set of monitoring occasions and the second set of monitoring occasions, complies with the declaration of capabilities of the UE. ### Claim 20 (depends on 19) The system of claim 19, wherein the aligned span pattern is a span pattern corresponding to the union of the first set of monitoring occasions and the second set of monitoring occasions. ### Claim 21 (depends on 19) The system of claim 19, wherein the processing circuit is further configured to: receive, from the network, a third search space configuration for a third component carrier in the carrier aggregation scheme; and receive, from the network, a fourth search space configuration for a fourth component carrier in the carrier aggregation scheme, wherein: the third search space configuration defines a third set of monitoring occasions, the fourth search space configuration defines a fourth set of monitoring occasions (MOs), and an unaligned span pattern, corresponding to the third set of monitoring occasions and the fourth set of monitoring occasions, complies with the declaration of capabilities of the UE. ### Claim 22 A system comprising a network, the network comprising a processing circuit configured to: receive, from a user equipment (UE), a declaration of capabilities of the UE; send, to the UE, a first search space configuration for a first component carrier in a carrier aggregation (CA) scheme; and send, to the UE, a second search space configuration for a second component carrier in the carrier aggregation scheme, wherein: the first search space configuration defines a first set of monitoring occasions, the second search space configuration defines a second set of monitoring occasions (MOs), and an aligned span pattern, corresponding to the first set of monitoring occasions and the second set of monitoring occasions, complies with the declaration of capabilities of the UE. ### Claim 23 (depends on 22) The system of claim 22, wherein the aligned span pattern is a span pattern corresponding to the union of the first set of monitoring occasions and the second set of monitoring occasions.