Channel state information (CSI) processing unit (CPU) occupancy for user equipment (UE) initiated CSI requests
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for a user equipment (UE) and a base station (BS) to determine channel state information (CSI) processing unit (CPU) occupancy of the UE. The UE and the BS may determine that at least one CPU from a CPU pool is occupied by an uplink CSI request from a CSI reference signal (CSI-RS) to at least a CSI request occasion. The UE and the BS may determine a number of occupied CPUs, for example, based on an accumulated or aggregated number of occupied CPUs for multiple CSI operations. The UE may perform a number of CSI operations based on the determined number of occupied CPUs. The BS may configure the UE to perform the number of CSI operations, for example, by transmitting one or more of a configuration, activation, or scheduling message.
1 . A method of wireless communication at an apparatus of a user equipment (UE), comprising:
triggering an uplink channel state information (CSI) request that occupies at least one CSI processing unit (CPU) from a CPU pool during a period from a CSI reference signal (CSI-RS) to at least a CSI request occasion on which the UE can transmit the uplink CSI request; and
performing a number of CSI operations based on a number of occupied CPUs including the at least one CPU occupied by the uplink CSI request.
2 . The method of claim 1 , wherein the number of occupied CPUs is an accumulated number of occupied CPUs for each of a number of concurrent CSI operations including uplink CSI requests and downlink-triggered CSI requests.
3 . The method of claim 1 , wherein the number of CSI operations use up to a total number of CPUs in the CPU pool.
4 . The method of claim 1 , wherein the CPU pool comprises one of: a shared CPU pool for uplink CSI requests and downlink control information (DCI)-based CSI requests, a CPU pool for uplink CSI requests separate from a CPU pool for DCI-based CSI requests, or a dedicated subset of a larger CPU pool for DCI-based CSI requests.
5 . The method of claim 1 , wherein the at least one CPU for the uplink CSI request is used for a corresponding DCI-based CSI request.
6 . The method of claim 1 , further comprising transmitting an indication of a number of supported CPUs for uplink CSI requests.
7 . The method of claim 1 , wherein the at least one CPU is occupied from a first symbol of the CSI-RS to a last symbol of the CSI request occasion.
8 . The method of claim 1 , wherein a number of the at least one CPU for the uplink CSI request is based on a trigger state for the uplink CSI request, less than a number of occupied CPUs for a corresponding DCI-based CSI request, or both.
9 . The method of claim 1 , further comprising receiving a CSI resource at a time offset after the uplink CSI request.
10 . An apparatus of a user equipment (UE) for wireless communication, comprising:
an interface; and
a processing system coupled to the interface and configured to:
trigger an uplink channel state information (CSI) request that occupies at least one CSI processing unit (CPU) from a CPU pool during a period from a CSI reference signal (CSI-RS) to at least a CSI request occasion on which the UE can transmit the uplink CSI request; and
perform a number of CSI operations based on a number of occupied CPUs including the at least one CPU occupied by the uplink CSI request.
11 . The apparatus of claim 10 , wherein the number of occupied CPUs is an accumulated number of occupied CPUs for each of a number of concurrent CSI operations including uplink CSI requests and downlink-triggered CSI requests.
12 . The apparatus of claim 10 , wherein the number of CSI operations use up to a total number of CPUs in the CPU pool.
13 . The apparatus of claim 10 , wherein the CPU pool comprises one of: a shared CPU pool for uplink CSI requests and downlink control information (DCI)-based CSI requests, a CPU pool for uplink CSI requests separate from a CPU pool for DCI-based CSI requests, or a dedicated subset of a larger CPU pool for DCI-based CSI requests.
14 . The apparatus of claim 10 , wherein the at least one CPU for the uplink CSI request is used for a corresponding DCI-based CSI request.
15 . The apparatus of claim 10 , wherein the interface is configured to output an indication of a number of supported CPUs for uplink CSI requests.
16 . The apparatus of claim 10 , wherein the at least one CPU is occupied from a first symbol of the CSI-RS to a last symbol of the CSI request occasion.
17 . The apparatus of claim 10 , wherein a number of the at least one CPU for the uplink CSI request is based on a trigger state for the uplink CSI request, less than a number of occupied CPUs for a corresponding DCI-based CSI request, less than a number of occupied CPUs for a corresponding DCI-based CSI request, or both.
18 . The apparatus of claim 10 , wherein the interface is configured to obtain a CSI resource at a time offset after the uplink CSI request.
19 . An apparatus of a user equipment (UE) for wireless communication, comprising:
means for triggering an uplink channel state information (CSI) request that occupies at least one CSI processing unit (CPU) from a CPU pool during a period from a CSI reference signal (CSI-RS) to at least a CSI request occasion on which the UE can transmit the uplink CSI request; and
means for performing a number of CSI operations based on a number of occupied CPUs including the at least one CPU occupied by the uplink CSI request.
20 . A method of wireless communication at an apparatus of a base station (BS), comprising:
receiving an uplink channel state information (CSI) request that occupies at least one CSI processing unit (CPU) from a CPU pool of a user equipment (UE) during a period from a CSI reference signal (CSI-RS) to at least a CSI request occasion on which the uplink CSI request is received; and
configuring the UE to perform a number of CSI operations based on a number of occupied CPUs including the at least one CPU occupied by the uplink CSI request.
21 . The method of claim 20 , wherein the number of occupied CPUs is an accumulated number of occupied CPUs for each of a number of concurrent CSI operations including uplink CSI requests and downlink-triggered CSI requests.
22 . The method of claim 20 , wherein the number of CSI operations use up to a total number of CPUs in the CPU pool.
23 . The method of claim 20 , wherein the CPU pool comprises one of: a shared CPU pool for uplink CSI requests and downlink control information (DCI)-based CSI requests, a CPU pool for uplink CSI requests separate from a CPU pool for DCI-based CSI requests, or a dedicated subset of a larger CPU pool for DCI-based CSI requests.
24 . The method of claim 20 , wherein the at least one CPU for the uplink CSI request is used for a corresponding downlink triggered CSI request.
25 . The method of claim 20 , further comprising receiving an indication of a number of supported CPUs for uplink CSI requests.
26 . The method of claim 20 , wherein a number of the at least one CPU for the uplink CSI request is based on a trigger state for the uplink CSI request, less than a number of occupied CPUs for a corresponding DCI-based CSI request, or both.
27 . The method of claim 20 , further comprising transmitting a CSI resource at a time offset after the uplink CSI request.
28 . An apparatus of a base station for wireless communication, comprising:
an interface; and
a processing system coupled to the interface and configured to:
receive an uplink channel state information (CSI) request that occupies at least one CSI processing unit (CPU) from a CPU pool of a user equipment (UE) during a period from a CSI reference signal (CSI-RS) to at least a CSI request occasion on which the uplink CSI request is received; and
configure the UE to perform a number of CSI operations based on a number of occupied CPUs including the at least one CPU occupied by the uplink CSI request.
29 . The apparatus of claim 28 , wherein the number of occupied CPUs is an accumulated number of occupied CPUs for each of a number of concurrent CSI operations including uplink CSI requests and downlink-triggered CSI requests.
30 . The apparatus of claim 28 , wherein the number of CSI operations use up to a total number of CPUs in the CPU pool.
31 . The apparatus of claim 28 , wherein the CPU pool comprises one of: a shared CPU pool for uplink CSI requests and downlink control information (DCI)-based CSI requests, a CPU pool for uplink CSI requests separate from a CPU pool for DCI-based CSI requests, or a dedicated subset of a larger CPU pool for DCI-based CSI requests.
32 . The apparatus of claim 28 , wherein the at least one CPU for the uplink CSI request is used for a corresponding downlink triggered CSI request.
33 . The apparatus of claim 28 , wherein the interface is configured to obtain an indication of a number of supported CPUs for uplink CSI requests.
34 . The apparatus of claim 28 , wherein a number of the at least one CPU for the uplink CSI request is based on a trigger state for the uplink CSI request, less than a number of occupied CPUs for a corresponding DCI-based CSI request, or both.
35 . The apparatus of claim 28 , wherein the interface is configured to output a CSI resource at a time offset after the uplink CSI request.