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US-20260128840-A1 - TYPE-1 HARQ-ACK CODEBOOK FOR A SINGLE DOWNLINK CONTROL INFORMATION SCHEDULING MULTIPLE CELLS

US20260128840A1US 20260128840 A1US20260128840 A1US 20260128840A1US-20260128840-A1

Abstract

A method in a network node is provided to schedule multiple cells in a single DCI. The method includes receiving a configuration of one or more conditions for starting and/or ending of co-scheduled PDSCHs across multiple cells with a single time, including one or more of: co-scheduled PDSCHs by the single DCI are expected to end in a same UL slot corresponding to PUCCH transmission; co-scheduled PDSCHs by the single DCI are expected to start in the same UL slot corresponding to PUCCH transmission; and any co-scheduled PDSCH by the single DCI is expected to end in a UL slot corresponding to PUCCH transmission not earlier than Km UL slots prior to the UL slot associated to the PUCCH transmission with HARQ-ACK feedback corresponding to the co-scheduled PDSCHs. The method further includes scheduling co-scheduled PDSCHs in multiple cells in the single DCI in accordance with the configuration.

Inventors

  • Sorour Falahati
  • Mattias Andersson
  • Ajit Nimbalker

Assignees

  • TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Dates

Publication Date
20260507
Application Date
20230929

Claims (18)

  1. 1 . A method in a network node to schedule multiple cells in a single downlink control information, DCI, the method comprising: receiving a configuration of one or more conditions for starting and/or ending of co-scheduled physical downlink shared channels, PDSCHs, across multiple cells with a single time, the one or more conditions comprising one or more of: co-scheduled PDSCHs by the single DCI are expected to end in a same uplink, UL, slot corresponding to PUCCH transmission; co-scheduled PDSCHs by the single DCI are expected to start in the same UL slot corresponding to physical uplink control channel, PUCCH, transmission; and any co-scheduled PDSCH by the single DCI is expected to end in a UL slot corresponding to PUCCH transmission not earlier than Km UL slots prior to the UL slot associated to the PUCCH transmission with hybrid automatic repeat request-acknowledgement, HARQ-ACK, feedback corresponding to the co-scheduled PDSCHs; and scheduling co-scheduled PDSCHs in multiple cells in the single DCI in accordance with the configuration.
  2. 2 . The method of claim 1 , wherein Km is a maximum K1 value configured or available by default to the UE for PUCCH transmission with HARQ-ACK.
  3. 3 . The method of claim 1 , wherein Km is provided by the configuration.
  4. 4 . The method of claim 1 , wherein Km is provided by the configuration and is limited to a maximum K1 value.
  5. 5 . A method in a network node to schedule multiple cells in a single downlink control information, DCI, the method comprising: obtaining an extended set of K1 values, Kext, for determining a set of M A,c candidate physical downlink shared channel, PDSCH, reception occasions for a cell c among the configured cells for single DCI scheduling multiple cells for Type-1 hybrid automatic repeat request-acknowledgement, HARQ-ACK, codebook; and scheduling co-scheduled PDSCHs in multiple cells in the single DCI.
  6. 6 . The method of claim 5 , further comprising determining the extended set of K1 values, Kext, in accordance with K 1_extended= K 1 U K ext where min>max, where U denotes a union.
  7. 7 . The method of claim 5 , wherein obtaining the extended set of K1 values comprises receiving a configuration having the extended set of K1 values from a higher layer.
  8. 8 . The method of claim 5 , wherein obtaining the extended set of K1 values comprises determining the set Kext, by configuring a cardinality of a set where Kext={max(K1)+1, . . . , max(K1)+N} with a step value of 1 or larger.
  9. 9 . The method of claim 5 , wherein obtaining the extended set of K1 values, Kext, comprises receiving a configuration having a minimum and/or maximum value of Kext with a step size of 1 or larger given by default or configuration and/or having a cardinality of the set Kext.
  10. 10 . The method of claim 5 , wherein obtaining the extended set of K1 values, Kext, comprises using different combinations of K0 and K1 values that can be used when scheduling multiple cells where Kext is determined so that all PDSCHs with K0 smaller than a maximum K0 have their effective K1 added to Kext.
  11. 11 . A method in a network node to schedule multiple cells in a single downlink control information, DCI, the method comprising: when a single DCI schedules multiple physical downlink shared channels, PDSCHs, across cells, receiving the hybrid automatic repeat request-acknowledgement, HARQ-ACK, information corresponding to co-scheduled PDSCHs in a physical uplink control channel, PUCCH, in UL slot n u ; determining, for every scheduled cell c, the co-scheduled PDSCH, outer PDSCH, that ends in a UL slot n e,c such that n u −n e,c >max (K1); and scheduling co-scheduled PDSCHs in multiple cells in the single DCI.
  12. 12 . The method of claim 11 , further comprising: reporting a corresponding HARQ-ACK feedback corresponding to the outer PDSCH on cell c using a candidate PDSCH reception occasion in M A,c corresponding to index k among the K1 values.
  13. 13 . The method of claim 12 , further comprising: responsive to there already being a PDSCH detected with a HARQ-ACK information for the candidate PDSCH reception occasion corresponding to index k in M A,c , combining HARQ-ACK feedback with the HARQ-ACK feedback of the outer PDSCH.
  14. 14 . The method of claim 11 , further comprising: collecting HARQ-ACK feedback for the outer PDSCHs across cells in a set of HARQ-ACK feedbacks; and appending the set of HARQ-ACK feedbacks to a Type-1 HARQ-ACK feedback codebook.
  15. 15 . The method of claim 11 , further comprising: selecting a reference PDSCH to be an earliest ending PDSCH.
  16. 16 . A network node configured to communicate with a base station, the network node comprising a radio interface and processing circuitry configured to perform the method of claim 1 .
  17. 17 . A method implemented by a host configured to operate in a communication system that further includes a network node, and a user equipment, UE, the method comprising: providing user data for the UE; and initiating transmissions carrying the user data to the UE via a cellular network comprising the network node, wherein the network node performs the method of claim 1 to transmit the user data from the host to the UE.
  18. 18 . A host configured to operate in a communication system to provide an over-the-top, OTT, service, the host comprising: processing circuitry configured to provide user data; and a network interface configured to initiate transmissions of the user data to a network node in a cellular network for transmission to user equipments, UEs, the network node having a communication interface and processing circuitry, the processing circuitry of the network node configured to perform the method of claim 1 to transmit the user data from the host to the UE.

Description

TECHNICAL FIELD The present disclosure relates generally to communications, and more particularly to communication methods and related devices and nodes supporting encoding and decoding. BACKGROUND Carrier Aggregation Carrier Aggregation is generally used in NR (5G) and LTE (long term evolution) systems to improve UE (user equipment) transmit receive data rate. With carrier aggregation (CA), the UE typically operates initially on single serving cell called a primary cell (Pcell). The Pcell is operated on a component carrier in a frequency band. The UE is then configured by the network with one or more secondary serving cells (Scell(s)). Each Scell can correspond to a component carrier (CC) in the same frequency band (intra-band CA) or different frequency band (inter-band CA) from the frequency band of the CC corresponding to the Pcell. For the UE to transmit/receive data on the Scell(s) (e.g., by receiving DL-SCH information on a PDSCH or by transmitting UL-SCH on a PUSCH), the Scell(s) need to be activated by the network. The Scell(s) can also be deactivated and later reactivated as needed via activation/deactivation signaling. Cross-Carrier Scheduling For NR carrier aggregation, cross-carrier scheduling (CCS) has been specified using the following framework: 1. UE has a primary serving cell and can be configured with one or more secondary serving cells (SCells)2. For a given SCell with Scell index X, a. if the SCell is configured with a ‘scheduling cell’ with cell index Y (cross-carrier scheduling) i. SCell X is referred to as the ‘scheduled cell’ii. UE monitors DL PDCCH on the scheduling cell Y for assignments/grants scheduling PDSCH/PUSCH corresponding to Sell X.iii. PDSCH/PUSCH corresponding to Sell X cannot be scheduled for the UE using a serving cell other than scheduling cell Y b. Otherwise i. SCell X is the scheduling cell for SCell X (same-carrier scheduling)ii. UE monitors DL PDCCH on SCell X for assignments/grants scheduling PDSCH/PUSCH corresponding to Sell Xiii. PDSCH/PUSCH corresponding to Sell X cannot be scheduled for the UE using a serving cell other than SCell X 3. An SCell cannot be configured as a scheduling cell for the primary cell. The primary cell is always its own scheduling cell. Dual Connectivity Dual Connectivity (DC) is generally used in NR (5G) and LTE systems to improve UE transmit receive data rate. With DC, the UE typically operates a master cell group (MCG) and a secondary cell group (SCG). Each cell group can have one or more serving cells. The MCG cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure is referred to as the primary cell or PCell. The SCG cell in which the UE performs random access when performing the Reconfiguration with Sync procedure is referred to as the primary SCG cell or PSCell. In some cases, the term “primary cell” or “primary serving cell” can refer to PCell for a UE not configured with DC, and can refer to PCell of MCG or PSCell of SCG for a UE configured with DC. PDCCH Monitoring In 3GPP NR standard, downlink control information (DCI) is received over the physical layer downlink control channel (PDCCH). The PDCCH may carry DCI in messages with different formats. DCI format 0_0 and 0_1 are DCI messages used to convey uplink grants to the UE for transmission of the physical uplink shared channel (PUSCH) and DCI format 1_0 and 1_1 are used to convey downlink grants for transmission of the physical downlink shared channel (PDSCH). Other DCI formats (2_0, 2_1, 2_2 and 2_3) are used for other purposes such as transmission of slot format information, reserved resource, transmit power control information etc. A PDCCH candidate is searched within a common or UE-specific search space which is mapped to a set of time and frequency resources referred to as a control resource set (CORESET). The search spaces within which PDCCH candidates must be monitored are configured to the UE via radio resource control (RRC) signaling. A monitoring periodicity is also configured for different PDCCH candidates. In any particular slot the UE may be configured to monitor multiple PDCCH candidates in multiple search spaces which may be mapped to one or more CORESETs. PDCCH candidates may need to be monitored multiple times in a slot, once every slot or once in multiple of slots. The smallest unit used for defining CORESETs is a Resource Element Group (REG) which is defined as spanning 1 PRB×1 OFDM symbol in frequency and time. Each REG contains demodulation reference signals (DM-RS) to aid in the estimation of the radio channel over which that REG was transmitted. When transmitting the PDCCH, a precoder could be used to apply weights at the transmit antennas based on some knowledge of the radio channel prior to transmission. It is possible to improve channel estimation performance at the UE