US-12627350-B2 - Dynamic PUCCH repetition via periodic CSI

Abstract

Techniques for reporting Channel State Information. CSI. An example method, implemented in a wireless device, comprises the steps of receiving ( 1 110 ) signaling identifying a plurality of time instants in which the wireless device may transmit distinct CSI reports, receiving ( 1120 ) signaling identifying a set of one or more resources to be used to transmit a physical channel carrying CSI reports, and receiving ( 1130 ) control signaling that identifies a resource in the set of resources, where the control signaling indicates a repetition factor for repetitively transmitting a CSI report, either by association with the resource identified by the control signaling or by a distinct indicator included in the control signaling. The example method further comprises transmitting ( 1140 ) the CSI report on the identified resource, according to the repetition factor and in a time instant of the plurality of time instants.

Inventors

• Robert Mark Harrison
• Shiwei Gao
• Siva Muruganathan
• Yufei Blankenship
• Zhipeng Lin

Assignees

• TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Dates

Publication Date

20260512

Application Date

20220401

Priority Date

20210402

Claims (19)

1. 1 . A method performed by a wireless device for reporting Channel State Information (CSI), the method comprising: receiving signaling identifying a plurality of time instants in which the wireless device may transmit distinct CSI reports; receiving signaling identifying a set of one or more resources to be used to transmit a physical channel carrying CSI reports; receiving control signaling that identifies a resource in the set of resources, wherein the control signaling indicates a repetition factor for repetitively transmitting a CSI report, either by association with the resource identified by the control signaling or by a distinct indicator included in the control signaling; and transmitting the CSI report on the identified resource, according to the repetition factor and in a time instant of the plurality of time instants.
2. 2 . The method of claim 1 , wherein the control signaling is a medium access control control element (MAC CE), and the resource is identified in the MAC CE with a field conveying an index identifying the set of resources among a plurality of sets of resources configured to the UE and a field conveying an index of the resource identifying the resource among the resources in the set of resources.
3. 3 . The method of claim 1 , wherein the control signaling is a medium access control control element (MAC CE), and the wireless device determines one of a subset of the set of resources, where the subset is configured for use within a periodic reporting configuration, the resource configuration for at least one resource of the subset comprises a repetition factor, and the selected resource is the identified resource.
4. 4 . The method of claim 1 , wherein the control signaling is downlink control information (DCI), and wherein the method further comprises one of: determining one of a subset of the set of resources, where the subset is configured for use within a periodic reporting configuration, the resource configuration for at least one resource of the subset comprises a repetition factor, and the selected resource is the identified resource, and determining a repetition factor of a set of repetition factors associated with the resource as the repetition factor.
5. 5 . The method of claim 4 , wherein the method further comprises transmitting a plurality of distinct CSI reports using the resource and according to the repetition factor, in subsequent ones of the plurality of time instants.
6. 6 . The method of claim 2 , wherein transmitting according to the repetition factor comprises not transmitting on the identified resource in the time instant when the repetition factor is a first value and transmitting on the identified resource in the time instant when the repetition factor is a value other than the first value.
7. 7 . The method of claim 1 , wherein the method further comprises additionally transmitting HARQ-ACK on the identified resource according to the repetition factor when HARQ-ACK is to be transmitted in the time instant.
8. 8 . The method of claim 1 , wherein the method further comprises: transmitting the CSI report once according to the repetition factor, wherein the transmission in response to the DCI is comprised in only the time instant of the plurality of time instants; and additionally transmitting HARQ-ACK in response to a downlink physical channel indicated by the DCI.
9. 9 . The method of claim 1 , wherein downlink control information (DCI) indicates resources to be used for a physical uplink shared channel (PUSCH) transmission in a different time instant of the plurality of time instants, and wherein the method further comprises: when the repetition factor corresponds to transmitting the physical channel once, transmitting a physical uplink shared channel (PUSCH) in response to the DCI and that carries the CSI report when the PUSCH is to be transmitted in the different time instant; and when the repetition factor corresponds to transmitting the CSI more than once, transmitting the CSI report on the identified resource, according to the repetition factor, and in the different time instant.
10. 10 . A wireless device for reporting Channel State Information (CSI), the wireless device comprising: one or more processors; and memory storing instructions executable by the one or more processors, whereby the wireless device is operable to: receive signaling identifying a plurality of time instants in which the wireless device may transmit distinct CSI reports; receive signaling identifying a set of one or more resources to be used to transmit a physical channel carrying CSI reports; receive control signaling that identifies a resource in the set of resources, wherein the control signaling indicates a repetition factor for repetitively transmitting a CSI report, either by association with the resource identified by the control signaling or by a distinct indicator included in the control signaling; and transmit the CSI report on the identified resource, according to the repetition factor and in a time instant of the plurality of time instants.
11. 11 . A method performed by a network node for obtaining Channel State Information (CSI), the method comprising: sending, to a wireless device, signaling identifying a plurality of time instants in which the wireless device may transmit distinct CSI reports; sending, to the wireless device, signaling identifying a set of one or more resources to be used to transmit a physical channel carrying CSI reports; sending, to the wireless device, control signaling that identifies a resource in the set of resources, wherein the control signaling indicates a repetition factor for repetitively transmitting a CSI report, either by association with the resource identified by the control signaling or by a distinct indicator included in the control signaling; and receiving the CSI report on the identified resource, according to the repetition factor and in a time instant of the plurality of time instants.
12. 12 . The method of claim 11 , wherein the control signaling is a medium access control control element (MAC CE), and the resource is identified in the MAC CE with a field conveying an index identifying the set of resources among a plurality of sets of resources configured to the UE and a field conveying an index of the resource identifying the resource among the resources in the set of resources.
13. 13 . The method of claim 11 , wherein the control signaling is a medium access control control element (MAC CE), and the wireless determines one of a subset of the set of resources, where the subset is configured for use within a periodic reporting configuration, the resource configuration for at least one resource of the subset comprises a repetition factor, and the selected resource is the identified resource.
14. 14 . The method of claim 11 , wherein the control signaling is downlink control information (DCI) and wherein the method further comprises one of: determining one of a subset of the set of resources, where the subset is configured for use within a periodic reporting configuration, the resource configuration for at least one resource of the subset comprises a repetition factor, and the selected resource is the identified resource, and determining a repetition factor of a set of repetition factors associated with the resource as the repetition factor.
15. 15 . The method of claim 14 , wherein the method further comprises receiving a plurality of distinct CSI reports using the resource and according to the repetition factor, in subsequent ones of the plurality of time instants.
16. 16 . The method of claim 15 , wherein receiving according to the repetition factor comprises not receiving on the identified resource in the time instant when the repetition factor is a first value and receiving on the identified resource in the time instant when the repetition factor is a value other than the first value.
17. 17 . The method of claim 11 , wherein the method further comprises additionally receiving HARQ-ACK on the identified resource according to the repetition factor when HARQ-ACK is to be received in the time instant.
18. 18 . The method of claim 11 , wherein the method further comprises: receiving the CSI report once according to the repetition factor, wherein a transmission by the wireless device in response to the DCI is comprised in only the time instant of the plurality of time instants; and additionally receiving HARQ-ACK in response to indicating a downlink physical channel by the DCI.
19. 19 . A network node for reporting Channel State Information (CSI), the network node comprising: one or more processors; and memory storing instructions executable by the one or more processors, whereby the network node is operable to: send, to a wireless device, signaling identifying a plurality of time instants in which the wireless device may transmit distinct CSI reports; send, to the wireless device, signaling identifying a set of one or more resources to be used to transmit a physical channel carrying CSI reports; send, to the wireless device, control signaling that identifies a resource in the set of resources, wherein the control signaling indicates a repetition factor for repetitively transmitting a CSI report, either by association with the resource identified by the control signaling or by a distinct indicator included in the control signaling; and receive the CSI report on the identified resource, according to the repetition factor and in a time instant of the plurality of time instants.

Description

TECHNICAL FIELD The present disclosure relates to the transmission of uplink control channel information in a wireless network, and more particularly relates to techniques for configuring a wireless device for such transmission. BACKGROUND The 3rd-Generation Partnership Project (3GPP) is continuing development of the next generation mobile wireless communication system (5G), commonly referred to as new radio (NR), which will support a diverse set of use cases and a diverse set of deployment scenarios. The latter includes deployment at both low frequencies (below 6 GHZ) and very high frequencies (up to 10's of GHZ). NR uses CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing) in both downlink (DL) (i.e., from a network node, gNB, or base station, to a user equipment or UE) and uplink (UL) (i.e., from UE to gNB). DFT-spread OFDM (Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing) is also supported in the uplink. In the time domain, NR downlink and uplink transmissions are organized into equally sized subframes of 1 ms each. A subframe is further divided into multiple slots of equal duration. The slot length depends on subcarrier spacing. For subcarrier spacing of Δf=15 kHz, there is only one slot per subframe, and each slot consists of 14 OFDM symbols. Data scheduling in NR is typically on a slot basis. An example of an NR slot is shown in FIG. 1, which illustrates the time-domain structure of an NR signal having 14-symbol slots, which might be used with a subcarrier spacing of 15 kHz. The first two symbols contain physical downlink control channel (PDCCH) while the rest contains physical shared data channel, either PDSCH (physical downlink shared channel) or PUSCH (physical uplink shared channel). Different subcarrier spacing values are supported in NR. The supported subcarrier spacing values (also referred to as different numerologies) are given by Δf=(15×2μ) kHz where μ∈{0,1,2,3,4}. Δf=15 kHz is the basic subcarrier spacing. The slot durations for different subcarrier spacings are given by 12μ⁢ ms. In the frequency domain, a system bandwidth is divided into resource blocks (RBs), each corresponding to 12 contiguous subcarriers. The RBs are numbered starting with 0 from one end of the system bandwidth. The basic NR physical time-frequency resource grid is illustrated in FIG. 2., where only one resource block (RB) within a 14-symbol slot is shown. One OFDM subcarrier during one OFDM symbol interval forms one resource element (RE). Downlink (DL) and uplink (UL) data transmissions can be either dynamically or semi-statically or semi-persistently scheduled by a gNB. In case of dynamic scheduling, the gNB may transmit in a downlink slot downlink control information (DCI) to a UE on PDCCH (Physical Downlink Control Channel) about data carried on a downlink physical shared channel (PDSCH) to the UE and/or data on an uplink physical shared channel (PUSCH) to be transmitted by the UE. In case of semi-statically scheduling, periodic data transmission in certain slots can be configured by RRC directly. In case of semi-persistent scheduling, periodic data transmission in certain slots can be configured by RRC and activated/deactivated by DCI. For each transport block data transmitted over PDSCH, a HARQ ACK is sent in an UL physical uplink control channel (PUCCH), indicating whether the UE decoded the transport block successfully. An ACK is sent if it is decoded successfully and a NACK is sent otherwise. PUCCH can also carry other UL control information (UCI) such as scheduling request (SR), link recovery request (LRR) and DL channel state information (CSI). There are three DCI formats defined for scheduling PDSCH in NR, i.e., DCI format 1_0 and DCI format 1_1, which were introduced in NR Rel-15, and DCI format 1_2 which was introduced in NR Rel-16. DCI format 1_0 has a smaller size than DCI 1_1 and can be used when a UE is not fully connected to the network, while DCI format 1_1 can be used for scheduling MIMO (Multiple-Input-Multiple-Output) transmissions with multiple MIMO layers. In NR Rel-16, DCI format 1_2 was introduced for downlink scheduling. One of the main motivations for having the new DCI format is to be able to configure a very small DCI size which can provide some reliability improvement without losing much flexibility. The main design target of the new DCI format is thus to have DCI with configurable sizes for some fields with a minimum DCI size targeting a reduction of 10-16 bits relative to Rel-15 DCI format 1_1. NR HARQ ACK/NACK Feedback Over PUCCH When receiving a PDSCH in the downlink from a serving gNB at slot n, a UE feeds back a HARQ ACK (alternatively called ‘HARQ ACK/NACK’ or ‘ACK/NACK’) at slot n+k over a PUCCH (Physical Uplink Control Channel) resource in the uplink to the gNB if the PDSCH is decoded successfully. Otherwise, the UE sends HARQ-ACK at slot n+k to the gNB to indicate that the PDSCH is not decoded successfully. If two transport blocks (T