US-12621028-B2 - Type II port selection codebook enhancements

Abstract

A user equipment (UE) configured to report Channel State Information (CSI) to a wireless network. The UE transmits a first sounding reference signal (SRS) on an uplink (UL) channel, receives a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, performs first CSI-RS measurements based on the first configuration of CSI-RS parameters, transmits a first CSI report including the first CSI-RS measurements, transmits a second SRS on the UL channel, receives a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, performs second CSI-RS measurements based on the second configuration of CSI-RS parameters and transmits a second CSI report including the second CSI-RS measurements.

Inventors

• Haitong Sun
• Weidong Yang
• Yushu Zhang
• Chunhai Yao
• Chunxuan Ye
• Dawei Zhang
• Hong He
• Huaning Niu
• Ismael Gutierrez Gonzalez
• Oghenekome Oteri
• Wei Zeng

Assignees

• APPLE INC.

Dates

Publication Date

20260505

Application Date

20201002

Claims (13)

1. 1 . A user equipment (UE), comprising: a transceiver configured to connect to a base station; and a processor communicatively coupled to the transceiver and configured to perform operations comprising: receiving a radio resource control (RRC) transmission configuring a maximum number of nonzero power channel state information reference signal (NZP-CSI-RS) resources; transmitting, to the base station, a first sounding reference signal (SRS) on an uplink (UL) channel; receiving, from the base station, a first CSI-RS on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, and wherein the first configuration of CSI-RS parameters includes a first number of NZP-CSI-RS resources; performing first CSI-RS measurements based on the first configuration of CSI-RS parameters; transmitting, to the base station, a first CSI report including the first CSI-RS measurements; transmitting, to the base station, a second SRS on the UL channel; receiving, from the base station, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, wherein the second configuration of CSI-RS parameters includes a second number of NZP-CSI-RS resources different than the first number of NZP-CSI-RS resources, wherein the second configuration is received via one of a medium access control control element (MAC-CE) transmission or a downlink control information (DCI) transmission, and wherein the second number of NZP-CSI-RS resources is a subset of the maximum number of NZP-CSI-RS resources; performing second CSI-RS measurements based on the second configuration of CSI-RS parameters; and transmitting, to the base station, a second CSI report including the second CSI-RS measurements.
2. 2 . The UE of claim 1 , wherein each of the first number of NZP-CSI-RS resources includes a different number of ports, and wherein each of the second number of NZP-CSI-RS resources includes a different number of ports.
3. 3 . The UE of claim 1 , wherein the first configuration of CSI-RS parameters includes a first number of ports for each CSI-RS resource and the second configuration of CSI-RS parameters includes a second number of ports for each CSI-RS resource, and wherein the first number of ports is different than the second number of ports.
4. 4 . The UE of claim 3 , wherein the second number of ports is the same for each CSI-RS resource.
5. 5 . The UE of claim 3 , wherein the operations further comprise: receiving a radio resource control (RRC) transmission configuring a maximum number of ports.
6. 6 . The UE of claim 5 , wherein the second configuration is received via one of a MAC-CE transmission or DCI transmission, and wherein the second number of ports is a subset of the maximum number of ports.
7. 7 . One or more processors configured to perform operations comprising: receiving a radio resource control (RRC) transmission configuring a maximum number of nonzero power channel state information reference signal (NZP-CSI-RS) resources; transmitting, to a base station of a wireless network, a first sounding reference signal (SRS) on an uplink (UL) channel; receiving, from the base station, a first CSI-RS on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, and wherein the first configuration of CSI-RS parameters includes a first number of NZP-CSI-RS resources; performing first CSI-RS measurements based on the first configuration of CSI-RS parameters; transmitting, to the base station, a first CSI report including the first CSI-RS measurements; transmitting, to the base station, a second SRS on the UL channel; receiving, from the base station, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, wherein the second configuration of CSI-RS parameters includes a second number of NZP-CSI-RS resources different than the first number of NZP-CSI-RS resources, wherein the second configuration is received via one of a medium access control control element (MAC-CE) transmission or a downlink control information (DCI) transmission, and wherein the second number of NZP-CSI-RS resources is a subset of the maximum number of NZP-CSI-RS resources; performing second CSI-RS measurements based on the second configuration of CSI-RS parameters; and transmitting, to the base station, a second CSI report including the second CSI-RS measurements.
8. 8 . The one or more processors of claim 7 , wherein each of the first number of NZP-CSI-RS resources includes a different number of ports, and wherein each of the second number of NZP-CSI-RS resources includes a different number of ports.
9. 9 . The one or more processors of claim 7 , wherein the first configuration of CSI-RS parameters includes a first number of ports for each CSI-RS resource and the second configuration of CSI-RS parameters includes a second number of ports for each CSI-RS resource, and wherein the first number of ports is different than the second number of ports.
10. 10 . The one or more processors of claim 9 , wherein the second number of ports is the same for each CSI-RS resource.
11. 11 . The one or more processors of claim 9 , wherein the operations further comprise: receiving a radio resource control (RRC) transmission configuring a maximum number of ports.
12. 12 . The one or more processors of claim 11 , wherein the second configuration is received via one of a MAC-CE transmission or DCI transmission, and wherein the second number of ports is a subset of the maximum number of ports.
13. 13 . A method, comprising: receiving a radio resource control (RRC) transmission configuring a maximum number of nonzero power channel state information reference signal (NZP-CSI-RS) resources; transmitting, to a base station, a first sounding reference signal (SRS) on an uplink (UL) channel of a wireless network; receiving, from the base station, a first CSI-RS on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, and wherein the first configuration of CSI-RS parameters includes a first number of NZP-CSI-RS resources; performing first CSI-RS measurements based on the first configuration of CSI-RS parameters; transmitting, to the base station, a first CSI report including the first CSI-RS measurements; transmitting, to the base station, a second SRS on the UL channel; receiving, from the base station, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, wherein the second configuration of CSI-RS parameters includes a second number of NZP-CSI-RS resources different than the first number of NZP-CSI-RS resources, wherein the second configuration is received via one of a medium access control control element (MAC-CE) transmission or a downlink control information (DCI) transmission, and wherein the second number of NZP-CSI-RS resources is a subset of the maximum number of NZP-CSI-RS resources; performing second CSI-RS measurements based on the second configuration of CSI-RS parameters; and transmitting, to the base station, a second CSI report including the second CSI-RS measurements.

Description

TECHNICAL FIELD This application relates generally to wireless communication systems, and in particular relates to channel state information reporting. BACKGROUND In 5G new radio (NR) wireless communications, the 5G NR network may assign one or more frequency sub-bands to a user equipment (UE) to exchange information with the network. These sub-bands are allocated to the UE based on measured channel conditions that the UE reports to a next generation NodeB (gNB) of the network based on channel state information (CSI) measurements conducted by the UE on a CSI reference signal (CSI-RS). In time division duplex (TDD) communications, channel reciprocity may be used by the gNB to determine downlink (DL) channel conditions based on the CSI measurements provided by the UE for the uplink (UL) channel. 3GPP Release 15 and Release 16 provide a type II port selection codebook that exploits this channel reciprocity. SUMMARY Some exemplary embodiments are related to a user equipment (UE) having a transceiver configured to connect to a base station and a processor communicatively coupled to the transceiver and configured to perform operations. The operations include transmitting, to the base station, a first sounding reference signal (SRS) on an uplink (UL) channel, receiving, from the base station, a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, performing first CSI-RS measurements based on the first configuration of CSI-RS parameters, transmitting, to the base station, a first CSI report including the first CSI-RS measurements, transmitting, to the base station, a second SRS on the UL channel, receiving, from the base station, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, performing second CSI-RS measurements based on the second configuration of CSI-RS parameters and transmitting, to the base station, a second CSI report including the second CSI-RS measurements. Other exemplary embodiments are related to one or more processors configured to perform operations. The operations include transmitting, to a base station of a wireless network, a first sounding reference signal (SRS) on an uplink (UL) channel, receiving, from the base station, a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, performing first CSI-RS measurements based on the first configuration of CSI-RS parameters, transmitting, to the base station, a first CSI report including the first CSI-RS measurements, transmitting, to the base station, a second SRS on the UL channel, receiving, from the base station, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, performing second CSI-RS measurements based on the second configuration of CSI-RS parameters and transmitting, to the base station, a second CSI report including the second CSI-RS measurements. Still further exemplary embodiments are related to a method that includes transmitting, to a base station, a first sounding reference signal (SRS) on an uplink (UL) channel of a wireless network, receiving, from the base station, a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, performing first CSI-RS measurements based on the first configuration of CSI-RS parameters, transmitting, to the base station, a first CSI report including the first CSI-RS measurements, transmitting, to the base station, a second SRS on the UL channel, receiving, from the base station, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, performing second CSI-RS measurements based on the second configuration of CSI-RS parameters and transmitting, to the base station, a second CSI report including the second CSI-RS measurements. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an exemplary network arrangement according to various exemplary embodiments. FIG. 2 shows an exemplary UE according to various exemplary embodiments. FIG. 3 shows an exemplary base station configured to establish a connection with a user equipment according to various exemplary embodiments. FIG. 4 shows a method of reconfiguring channel state information (CSI) resources according to various exemplary embodiments. FIG. 5 shows an exemplary diagram illustrating a CSI resource configuration according to various exemplary embodiments. DETAILED DESCRIPTION The exemplary embodiments may be further understood with reference to the following description and the related appended drawings, wherein like eleme