Techniques for thermal mitigation and power saving

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) can be configured to receive a first configuration indicating the UE to communicate with a base station using a set of receive ports. The UE can transmit, in accordance with the first configuration, a sounding reference signal (SRS) on a set of transmit ports corresponding to the set of receive ports in a first time interval associated with a first power state of the UE. The UE can then communicate using fewer transmit ports than all of the set of transmit ports for the SRS based on a determination to operate in a reduced power state. The UE can then receive a second configuration indicating the UE to communicate with the base station using a first subset of receive ports based on communicating using fewer transmit ports than all of the set of transmit ports for the SRS.

Description

[0001] Cross-referencing

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 111,916, filed December 4, 2020, entitled “TECHNIQUESFOR THERMAL MITIGATION AND POWER SAVING”, which has been assigned to the assignee of this application and whose entire contents are expressly incorporated herein by reference. Technical Field

[0003] This disclosure relates to wireless communications, including techniques for thermal mitigation and power saving. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems such as Long Term Evolution (LTE), LTE-A Advanced (LTE-A), or LTE-A Pro systems, and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each supporting communication with multiple communication devices (which may also be referred to as User Equipment (UE)) simultaneously.

[0005] In some wireless communication systems, the thermal state (e.g., temperature) of a wireless device (e.g., a UE) can affect its ability to communicate efficiently and reliably within the system. For example, if the UE's skin temperature (e.g., surface temperature) and / or junction temperature (e.g., substrate temperature) exceeds a certain thermal threshold, the UE's modem baseband and / or RF transceiver may fail to perform wireless communication. Therefore, some wireless devices (e.g., UEs) can be configured to implement various thermal mitigation and power-saving techniques to reduce operating temperature, save power, or both. However, some thermal mitigation and / or power-saving techniques have limitations in the context of fifth-generation (5G) and new radio (NR) access technologies. Summary of the Invention

[0006] The described techniques relate to improved methods, systems, devices, and apparatuses supporting techniques for thermal mitigation and power saving. Typically, the described techniques provide thermal mitigation and power saving at the user equipment (UE). In particular, techniques for Sounding Reference Signal (SRS) antenna switching (SRS-AS) for thermal mitigation and power saving in the context of fifth-generation (5G) and new radio (NR) access technologies. According to some aspects, the UE can be configured to transmit SRS on a subset of transmit ports corresponding to a subset of receive ports to instruct the UE to "fall back" to a lower transmit / receive mode. In this regard, the UE can sound the SRS at the subset of receive ports to fall back from a transmit / receive mode using more receive ports (e.g., four receive ports (e.g., 1T4R, 2T4R)) to a transmit / receive mode using fewer receive ports (e.g., one or two receive ports (e.g., 1T1R, 2T1R, 1T2R, 2T2R)).

[0007] For example, when operating in a first power state (e.g., normal or full power state, or normal or full operational state), the UE can transmit SRS on each transmit port corresponding to each receive port at the UE (e.g., probing all four receive ports). Such SRS transmissions on all receive ports are not necessarily simultaneous in the first power state, as antenna switching can be used to alternate transmissions on different SRS ports. Subsequently, the UE can determine to operate in a reduced power state based on identifying a high heat level (e.g., high temperature), a low power level (e.g., low battery level), or both. At this point, the UE can reduce the number of transmit ports on which it transmits SRS, or avoid transmitting SRS altogether. On the base station side, the base station can identify that SRS is not being transmitted / received for at least a subset of receive ports, and can thereby avoid scheduling transmissions for the corresponding receive ports. In this respect, by reducing (or eliminating) the number of transmit ports used to transmit SRS, the UE can prompt the base station to reduce the rank (e.g., number of layers) associated with the wireless communication at the UE, which can thereby reduce power consumption and / or heat levels at the UE, for example, by allowing the UE to disable, turn off, or otherwise deactivate one or more radio frequency transmission chains of the UE.

[0008] A method for wireless communication at a UE is described. The method may include: receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE; transmitting SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE, based on the UE determining that it is operating in a second power state lower than the first power state; communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for the SRS during a second time interval following the first time interval; and receiving a second configuration from the base station based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for the SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports.

[0009] An apparatus for wireless communication at a UE is described. The apparatus may include: a processor; a memory in electronic communication with the processor; and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: receive a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE; transmit SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE, according to the first configuration; based on the UE determining that it is operating in a second power state lower than the first power state, communicate with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for the SRS during a second time interval following the first time interval; and based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for the SRS, receive a second configuration from the base station, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports in the set of multiple receive ports.

[0010] Another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE; a unit for transmitting SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE, according to the first configuration; a unit for communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports for the SRS during a second time interval following the first time interval, based on the UE determining that it is operating in a second power state lower than the first power state; and a unit for receiving a second configuration from the base station based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports for the SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports.

[0011] A non-transitory computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE; according to the first configuration, transmit SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE; based on the UE determining to operate in a second power state lower than the first power state, communicate with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for the SRS during a second time interval following the first time interval; and based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for the SRS, receive a second configuration from the base station, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports in the set of multiple receive ports.

[0012] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, communicating with the base station using fewer transmission ports than all transmission ports in the set of the plurality of transmission ports used for the SRS may include operations, features, elements or instructions for avoiding transmission of SRS on all transmission ports in the set of the plurality of transmission ports, wherein receiving the second configuration may be based on the UE avoiding transmission of SRS on all transmission ports in the transmission ports.

[0013] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, communicating with the base station using fewer transmission ports than all of the plurality of transmission ports in the set for the SRS may include operations, features, elements or instructions for transmitting the SRS on a subset of the plurality of transmission ports during the second time interval, wherein receiving the second configuration may be based on transmitting the SRS on the subset of transmission ports.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining one or more parameters associated with the set of the plurality of receive ports; and selecting, based on the one or more parameters, the subset of the set of the plurality of transmit ports corresponding to a subset of the receive ports of the set of the plurality of receive ports, wherein transmitting the SRS on the subset of transmit ports may be based on the selection.

[0015] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the one or more parameters associated with the set of the plurality of receiving ports include a Received Signal Strength Indicator (RSSI) metric, a Reference Signal Received Power (RSRP) metric, a Reference Signal Received Quality (RSRQ) metric, a Signal-to-Noise Ratio (SNR), a Signal-to-Interference Plus-Noise Ratio (SINR), or any combination thereof.

[0016] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the set of the plurality of transmission ports includes four transmission ports, and the subset of transmission ports includes one or two transmission ports.

[0017] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining to operate in a second power state based on determining that the thermal state at the UE may be greater than or equal to a threshold thermal state, wherein communicating with the base station using fewer transmission ports than all transmission ports in the set of the plurality of transmission ports used for the SRS may be based on determining that the thermal state at the UE may be greater than or equal to the threshold thermal state.

[0018] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the thermal state includes the skin temperature of the UE, the junction temperature of the UE, or both.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining to operate in a second power state based on determining that the power level at the UE meets a threshold power level, wherein communicating with the base station using fewer transmission ports than all transmission ports in the set of the plurality of transmission ports used for the SRS may be based on determining that the power level at the UE meets the threshold power level.

[0020] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the power level satisfies the threshold power level when the power level may be less than or equal to the threshold power level.

[0021] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the power level includes the battery level of the UE.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending a Channel State Feedback (CSF) report to the base station based on the UE determining that it is operating in the second power state, wherein receiving the second configuration may be based on sending the CSF report and using fewer transmission ports than all of the plurality of transmission ports used for the SRS to communicate with the base station.

[0023] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining a rank associated with communication using one or more of the set of said plurality of receive ports and the base station; and selectively adjusting the determined rank to generate an adjusted rank smaller than the determined rank based on the UE determining that it is operating in the second power state, wherein the CSF report includes an indication of the adjusted rank.

[0024] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining a channel quality indicator (CQI) associated with communication using one or more of the set of said plurality of receive ports and the base station; and selectively adjusting the determined CQI to generate an adjusted CQI smaller than the determined CQI based on the UE determining that it is operating in the second power state, wherein the CSF report includes an indication of the adjusted CQI.

[0025] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending a capability report to the base station including an indication of one or more transmit / receive modes supported by the UE, wherein receiving the first configuration may be based on sending the capability report.

[0026] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the one or more transmit / receive modes include: a transmit / receive mode indicating one transmit port and four receive ports for the UE, a transmit / receive mode indicating two transmit ports and four receive ports for the UE, or both.

[0027] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, one or more parameters associated with a second subset of the set of the plurality of receive ports are selectively adjusted based on receiving the second configuration.

[0028] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the one or more parameters may be associated with a low-noise amplifier (LNA) for the second subset of receiver ports, a phase shifter for the second subset of receiver ports, or both. Attached Figure Description

[0029] Figure 1 An example of a wireless communication system that supports techniques for thermal mitigation and power saving, according to aspects of this disclosure, is shown.

[0030] Figure 2 An example of a wireless communication system that supports techniques for thermal mitigation and power saving, according to aspects of this disclosure, is shown.

[0031] Figure 3A and Figure 3B An example of a communication scheme supporting techniques for thermal mitigation and power saving, according to aspects of this disclosure, is shown.

[0032] Figure 4 An example of a process flow supporting techniques for thermal mitigation and power saving, based on aspects of this disclosure, is shown.

[0033] Figure 5 and Figure 6 A block diagram of an apparatus supporting techniques for heat mitigation and power saving, according to aspects of this disclosure, is shown.

[0034] Figure 7 A block diagram of a communication manager supporting technologies for thermal mitigation and power saving, according to aspects of this disclosure, is shown.

[0035] Figure 8 A diagram of a system including devices supporting technologies for heat mitigation and power saving, according to various aspects of this disclosure, is shown.

[0036] Figures 9 to 13 A flowchart illustrating a method for supporting techniques for heat mitigation and power saving, according to aspects of this disclosure, is shown. Detailed Implementation

[0037] In some wireless communication systems, the thermal state (e.g., temperature) of wireless devices (e.g., user equipment (UE)) can affect their ability to communicate efficiently and reliably within the wireless communication system. For example, at the UE's skin temperature T... skin (e.g., surface temperature) and / or junction temperature T j (For example, substrate temperature) exceeds a certain thermal threshold (e.g., if T skin >43℃, and / or T j In temperatures exceeding 95°C, the UE's modem baseband and / or RF transceiver may be unable to perform wireless communication. Therefore, some wireless devices (e.g., UEs) can be configured to implement various thermal mitigation and power-saving techniques to reduce operating temperatures (e.g., T). skin T j This can be achieved by a UE saving power or both. For example, in the context of Long Term Evolution (LTE) communications using carrier aggregation, a UE can save power and reduce operating temperature by dropping carriers associated with a secondary cell. For instance, a UE can report a poor channel quality indicator associated with a carrier of a secondary cell, causing the base station to stop scheduling transmissions on the indicated carrier, resulting in the carrier being dropped at the UE. By reducing the number of carriers monitored at the UE, power consumption can be reduced, and the operating temperature at the UE can be lowered. However, fifth-generation (5G) and new radio (NR) radio access technologies can use a single component carrier, compared to LTE radio access technologies that utilize multi-carrier aggregation. In this respect, the techniques used for thermal mitigation and power saving in LTE access technologies may not be suitable for 5G and NR access technologies, for example, when the UE is operating in standalone mode.

[0038] Therefore, techniques for thermal mitigation and power saving at the UE are disclosed. In particular, techniques for Sounding Reference Signal Antenna Switching (SRS-AS) for thermal mitigation and power saving in the context of NR and 5G access technologies are described. According to some aspects, the UE can be configured to transmit SRS on a subset of transmit ports corresponding to a subset of receive ports in order to indicate to the UE that it wants to "fall back" to a lower transmit / receive mode. In this regard, the UE can sound SRS at the UE to fall back from a transmit / receive mode using more receive ports (e.g., four receive ports (e.g., 1T4R, 2T4R)) to a transmit / receive mode using fewer receive ports (e.g., one or two receive ports (e.g., 1T1R, 2T1R, 1T2R, 2T2R)).

[0039] For example, when operating in a first power state (e.g., normal power state, or normal operation state), the UE can transmit SRS on each transmit port corresponding to each receive port at the UE (e.g., probing all four receive ports). Such SRS transmissions on all receive ports are not necessarily simultaneous in the first power state, as antenna switching can be used to alternate transmissions on different SRS ports. Subsequently, the UE can determine to operate in a reduced power state based on identifying a high heat level (e.g., high temperature), a low power level (e.g., low battery level), or both. At this point, the UE can reduce the number of transmit ports on which it transmits SRS, or avoid transmitting SRS altogether. On the base station side, the base station can identify that SRS is not being transmitted or received for at least a subset of receive ports, and can thereby avoid scheduling transmissions for individual receive ports. In this respect, by reducing (or eliminating) the number of transmit ports used to transmit SRS, the UE can prompt the base station to reduce the rank (e.g., number of layers) associated with wireless communication at the UE, which can thereby reduce power consumption and / or heat levels at the UE, for example, by allowing the UE to disable, turn off, or otherwise deactivate one or more radio frequency transmission chains of the UE.

[0040] In some cases, the UE can be configured to spoof (e.g., forge) Channel State Feedback (CSF) reports to the base station in addition to performing SRS-AS, in order to further reduce the rank associated with the wireless communication at the UE. For example, in addition to avoiding sending SRS on the transmit port associated with the receive port, the UE can also report poor channel quality indicators associated with the wireless communication at the corresponding receive port, so that the base station avoids scheduling transmissions at the corresponding receive port. In some aspects, the techniques disclosed herein can be used to reduce the rank of the wireless communication at the UE in the context of NR communication, which can thereby lead to reduced power consumption at the UE and thus reduced temperature. Such thermal mitigation techniques can be applied to wireless communication contexts in multiple frequency ranges of NR communication (e.g., FR1, FR2, or both).

[0041] Various aspects of this disclosure are first described in the context of a wireless communication system. Additional aspects of this disclosure are described in the context of example communication schemes and example process flows. Various aspects of this disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to techniques for thermal mitigation and power saving.

[0042] Figure 1 An example of a wireless communication system 100 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be an LTE network, an Advanced LTE (LTE-A) network, an LTE-APro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0043] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. The coverage area 110 can be an example of a geographical area, and base station 105 and UE 115 can support communication of signals based on one or more radio access technologies on the coverage area 110.

[0044] UE 115 can be distributed throughout the coverage area of ​​wireless communication system 100, and each UE 115 can be stationary, mobile, or both stationary and mobile at different times. UE 115 can be devices with different forms or different capabilities. Figure 1 Some example UE 115s are shown in the document. The UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as... Figure 1 As shown.

[0045] Base station 105 can communicate with core network 130, communicate with each other, or both. For example, base station 105 can be connected to core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 can communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) or both via backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 can be or includes one or more radio links.

[0046] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base station transceiver, wireless base station, access point, radio transceiver, node B, eNodeB (eNB), next-generation node B or gigabit node B (any of which may be referred to as gNB), home node B, home eNodeB or other suitable terms.

[0047] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or Machine Type Communication (MTC) device, etc., which may be implemented in various objects such as appliances, vehicles, meters, etc.

[0048] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that may sometimes act as relays, as well as base station 105 and network devices, including such... Figure 1The examples shown are macro eNBs or gNBs, small cell eNBs or gNBs, or relay stations, etc.

[0049] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a collection of radio spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio frequency spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating operation for the carrier, user data, or other signaling. Wireless communication system 100 can use carrier aggregation or multi-carrier operation to support communication with UE 115. UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0050] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. The carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and can be located according to a channel grid for discovery by UE 115. The carrier can operate in standalone mode, where UE 115 can perform initial acquisition and connection via the carrier, or the carrier can operate in non-standalone mode, in which different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0051] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. A carrier may carry either downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0052] A carrier can be associated with a specific bandwidth of the radio spectrum, and in some examples, the carrier bandwidth can be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth can be one of several defined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) can have a hardware configuration that supports communication on a specific carrier bandwidth, or can be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 can be configured to operate on a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0053] The signal waveform transmitted on a carrier can consist of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Spread Spectrum OFDM (DFT-S-OFDM). In a system employing MCM, a resource element can consist of one symbol period (e.g., the duration of a modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can also increase the data rate or data integrity used for communication with the UE 115.

[0054] One or more digital parameters of a carrier can be supported, where the digital parameters may include the subcarrier spacing (Δf) and the cyclic prefix. A carrier can be divided into one or more BWPs with the same or different numerical naming conventions. In some examples, the UE 115 can be configured with multiple BWPs. In some examples, a single BWP of a carrier can be active at a given time, and communication for the UE 115 can be restricted to one or more active BWPs.

[0055] The time interval of base station 105 or UE 115 can be expressed as a multiple of the basic time unit, for example, it can refer to T. s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf maxThis can represent the maximum supported subcarrier spacing, and N f This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resource can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0056] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into (e.g., in the time domain) subframes, and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N) f Sampling period. The duration of the symbol period can depend on the subcarrier spacing or the operating frequency band.

[0057] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0058] Physical channels can be multiplexed on a carrier using various techniques. For example, physical control channels and physical data channels can be multiplexed on a downlink carrier using one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth of the carrier or a subset of the carrier's system bandwidth. One or more control regions (e.g., CORESETs) can be configured for a set of UEs 115. For example, one or more UEs 115 can monitor or search for control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates arranged in a cascaded manner at one or more aggregation levels. The aggregation level for control channel candidates can refer to multiple control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115, and a UE-specific search space set used to send control information to a particular UE 115.

[0059] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" refers to a logical communication entity used to communicate with base station 105 (e.g., via a carrier) and may be associated with an identifier used to distinguish neighboring cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which the logical communication entity operates. The extent of such cells can range from small areas (e.g., structures, subsets of structures) to large areas, depending on various factors (e.g., the capabilities of base station 105). For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, etc.

[0060] Macro cells typically cover a relatively large geographical area (e.g., a radius of several kilometers) and can allow unrestricted access to UE 115 that has subscribed to services from a network provider supporting the macro cell. In contrast, small cells can be associated with low-power base station 105 and can operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells can provide unrestricted access to UE 115 that has subscribed to services from a network provider, or can provide restricted access to UE 115 associated with the small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), or UE 115 associated with a user in a home or office). Base station 105 can support one or more cells and can also use one or more component carriers to support communication on one or more cells.

[0061] In some examples, a carrier can support multiple cells, and different cells can be configured based on different protocol types that can provide access to different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0062] In some examples, base station 105 may be mobile and thus provide communication coverage for mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0063] Some UE115s can be configured to operate in a power-saving mode (e.g., power state), such as half-duplex communication (e.g., a mode that supports unidirectional communication via either transmission or reception, but not simultaneously). In some examples, half-duplex communication can be performed at a reduced peak rate. Other power-saving techniques for UE115 include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UE115s can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a carrier's guard band, or outside a carrier.

[0064] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private or group communication and can be supported by one or more mission-critical services (e.g., mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData)). Support for mission-critical functions can include prioritizing services that are available for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency are used interchangeably herein.

[0065] In some examples, UE 115 is also capable of communicating directly with other UEs via device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UEs 115 utilizing D2D communication can be within the geographic coverage area 110 of base station 105. Other UEs 115 in such a group may be located outside the geographic coverage area 110 of base station 105 or unable to receive transmissions from base station 105. In some examples, the group of UEs 115 communicating via D2D communication can use a one-to-many (1:M) system, in which each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between these UEs 115 without the involvement of base station 105.

[0066] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) routing packets or interconnects to external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by base station 105 associated with core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to IP service 150 for one or more network operators. IP service 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0067] Some network devices (e.g., base station 105) may include sub-components (e.g., access network entity 140), which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 through one or more other access network transport entities 145, which may be referred to as a radio headend, a smart radio headend, or a transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna arrays. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0068] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. The region from 300 MHz to 3 GHz is generally referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range extends from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features; however, the waves can penetrate structures sufficiently to enable macrocells to provide service to UE 115 located indoors. Compared to transmissions using lower frequencies and longer waves in the spectrum below 300 MHz in the High Frequency (HF) or Very High Frequency (VHF) portions, UHF wave transmissions can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0069] Wireless communication system 100 can utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 can employ Licensed Assisted Access (LAA) or LTE Unlicensed (LTE-U) radio access technology or NR technology in unlicensed bands such as the 5 GHz Industrial, Scientific, and Medical (ISM) band. When operating in an unlicensed radio frequency band, wireless devices (such as base station 105 and UE 115) can employ a pre-call listening (LBT) procedure to ensure that the frequency channel is idle before transmitting data. In some examples, operation in the unlicensed band can be based on carrier aggregation configuration combined with component carriers operating in a licensed band (e.g., LAA). Operation in the unlicensed spectrum can include downlink transmission, uplink transmission, P2P transmission, or D2D transmission, etc.

[0070] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna frames that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with multiple rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna frame may support radio frequency beamforming for signals transmitted via the antenna ports.

[0071] Base station 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such a technique can be called spatial multiplexing. For example, multiple signals can be transmitted by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals can be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) where multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO) where multiple spatial layers are transmitted to multiple devices.

[0072] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape antenna beams or manipulate antenna beams (e.g., transmit beams, receive beams) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating relative to the antenna array in a particular direction undergo constructive interference while others undergo destructive interference. The adjustment of signals transmitted via antenna elements can include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with the device. The adjustment associated with each of these antenna elements can be defined by a beamforming weight set associated with a particular direction (e.g., relative to the antenna array of the transmitting or receiving device or relative to some other direction).

[0073] Base station 105 or UE 115 may use beam scanning technology as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna curtains) to perform beamforming operations for directional communication with UE 115. Base station 105 may transmit several signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as base station 105, or by a receiving device such as UE 115) the beam direction for later transmission or reception by base station 105.

[0074] Some signals (such as data signals associated with a specific receiving device) may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with a receiving device such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signals received by UE 115 with the highest signal quality or acceptable signal quality.

[0075] In some examples, multiple beam directions can be used to perform transmissions by a device (e.g., base station 105 or UE 115), and the device can use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from base station 105 to UE 115). UE 115 can report feedback indicating precoding weights for one or more beam directions, and this feedback can correspond to a configured number of beams spanning the system bandwidth or one or more subbands. Base station 105 can transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)), which can be precoded or unprecoded. UE 115 can provide feedback for beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multifaceted codebook, linear combination codebook, port selection codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying the beam direction of subsequent transmission or reception of UE 115) or for transmitting signals in a single direction (e.g., for transmitting data to a receiving device).

[0076] A receiving device (e.g., UE 115) may attempt multiple receiving configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may attempt multiple receiving directions by: receiving via different antenna subarrays; processing the received signal according to different antenna subarrays; receiving according to different sets of receiving beamforming weights (e.g., different sets of directional listening weights) applied to signals received at multiple sets of antenna elements in the antenna array; or processing the received signal according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements in the antenna array. Any of these can be referred to as "listening" according to different receiving configurations or receiving directions. In some examples, the receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when receiving data signals). Individual receiver configurations can be aligned on beam directions determined based on listening according to different receiver configuration directions (e.g., determined to have the highest signal strength, highest signal-to-noise ratio (SNR), highest signal-to-interference-plus-noise ratio (SINR), or other acceptable signal quality based on listening according to multiple beam directions).

[0077] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer can perform priority processing and multiplexing logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and the base station 105 or core network 130 that supports radio bearers for user plane data. At the physical layer, transport channels can be mapped to physical channels.

[0078] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correct data reception over communication link 125. HARQ can include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device can support same-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in a previous symbol within that time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0079] In some wireless communication systems (e.g., wireless communication system 100), base station 105 can utilize SRS-AS to measure channel quality between UE 115 and base station 105 (e.g., measuring rank sum and / or channel quality indicator (CQI)). Furthermore, base station 105 can configure UE 115 to operate in one or more transmit / receive modes (e.g., 1T4R, 2T4R), wherein SRS-AS is performed in the respective transmit / receive mode by transmitting SRS on a single antenna port in a cyclic (e.g., "round-robin") manner. For example, in the context of 1T4R transmit / receive mode, UE 115 can be configured to use one transmit antenna port and four receive antenna ports in a first power state (e.g., normal or default power state). In contrast, in the context of 2T4R transmit / receive mode, UE 115 can be configured to use two transmit antenna ports and four receive antenna ports in a first power state (e.g., normal or default power state).

[0080] The UE 115 of the wireless communication system 100 can support techniques for thermal mitigation and power saving at the UE 115. Specifically, the UE 115 of the wireless communication system 100 can be configured to perform SRS-AS techniques for thermal mitigation and power saving in the context of NR and 5G access technologies, so that the base station 105 of the wireless communication system 100 reduces the rank associated with wireless communication at the UE 115 (e.g., reduces the number of layers). In this regard, by reducing the rank of wireless communication at the base station 105, the techniques described herein enable the UE 115 to deactivate its receive port, enter a lower power state, reduce power consumption at the UE 115, and reduce the temperature at the UE 115.

[0081] For example, when operating in a first power state (e.g., normal power state, or normal operation state), the UE 115 of the wireless communication system 100 may transmit SRS on each transmit port corresponding to each receive port at the UE 115 (e.g., probe all four receive ports). Such SRS transmissions on all receive ports are not necessarily simultaneous in the first power state, as antenna switching can be used to alternate transmissions on different SRS ports. Subsequently, the UE 115 may determine to operate in a reduced power state based on identifying a high heat level (e.g., high temperature), a low power level (e.g., low battery level), or both. At this point, the UE 115 may reduce the number of transmit ports on which it transmits SRS, or avoid transmitting SRS altogether. From the perspective of the base station 105, the base station 105 may identify that SRS is not being transmitted / received for at least a subset of receive ports, and may thereby avoid scheduling transmissions for the corresponding receive ports. In this regard, by reducing (or eliminating) the number of transmit ports used to transmit SRS, UE 115 can prompt the base station to reduce the rank (e.g., number of layers) associated with wireless communication at UE 115, which can thereby reduce power consumption and / or heat levels at UE 115, for example by allowing UE 115 to disable, turn off, or otherwise deactivate one or more radio frequency transmit chains of UE 115.

[0082] In some cases, UE 115 can be configured to spoof (e.g., forge) CSF reports to base station 105 in addition to performing SRS-AS, so as to further reduce the rank associated with wireless communication at UE 115. For example, in addition to avoiding sending SRS on the transmit port associated with the receive port, UE 115 can also report poor channel quality indicators associated with wireless communication at the corresponding receive port, so that base station 105 avoids scheduling transmissions at the corresponding receive port. In some aspects, the techniques disclosed herein can be used to reduce the rank of wireless communication at UE in the context of NR communication, which can thereby lead to reduced power consumption at UE and thus reduced temperature.

[0083] The techniques described herein enable UE 115 of a wireless communication system 100 to reduce its power state, thereby reducing power consumption and temperature at UE 115. Specifically, the techniques described herein enable UE 115 to perform SRS-AS, wherein UE 115 avoids transmitting SRS and / or uses a subset of its transmit ports to transmit SRS, thereby allowing base station 105 to reduce the rank of scheduled transmissions. In this regard, by reducing the rank of scheduled transmissions at base station 105, UE 115 can deactivate one or more receive ports, thereby enabling UE 115 to enter a lower power state, reducing power consumption and temperature. This thermal mitigation and power-saving technique enables UE 115 to reduce power consumption at its modem baseband and RF transceiver components.

[0084] Figure 2 An example of a wireless communication system 200 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. The wireless communication system 200 may include a UE 115-a and a base station 105-a, which may be references Figure 1 Examples of UE 115 and base station 105 described.

[0085] The UE 115-a and base station 105-a of the wireless communication system 200 can communicate with each other via communication link 205. Communication link 205 may include examples of links between two UEs 115 (e.g., a sidelink communication link or a PC5 link). In this regard, communication link 205 may include a bidirectional link supporting both uplink and downlink transmissions.

[0086] In some aspects, the UE 115-a and base station 105-a of the wireless communication system 200 can support techniques for thermal mitigation and power saving at the UE 115-a. Specifically, the UE 115-a of the wireless communication system 200 can be configured to perform SRS-AS techniques for thermal mitigation and power saving in the context of NR and 5G access technologies, so that the base station 105 of the wireless communication system 200 reduces the rank associated with the wireless communication at the UE 115-a (e.g., reduces the number of layers). In this regard, by reducing the rank of the wireless communication at the base station 105-a, the techniques described herein enable the UE 115-a to deactivate its receive port, enter a lower power state, reduce power consumption at the UE 115-a, and reduce the temperature at the UE 115-a.

[0087] For example, UE 115-a can send a capability report 210 to base station 105-a. In some aspects, capability report 210 may include an indication of one or more transmit / receive modes supported by UE 115-a. For example, capability report 210 may indicate that UE 115-a supports a transmit / receive mode including one transmit port and four receive ports (e.g., 1T4R), a transmit / receive mode including two transmit ports and four receive ports (e.g., 2T4R), or both. UE 115-a can be configured to support any number or type of transmit / receive modes, including any number of transmit ports, any number of receive ports, or both.

[0088] In some aspects, base station 105-a may send an indication of a first configuration 220-a for communication between UE 115-a and base station 105-a. The first configuration 220-a may indicate one or more parameters associated with wireless communication between UE 115-a and base station 105-a, including the transmit / receive mode to be used at UE 115-a, the number of transmit ports and / or receive ports to be used by UE 115-a, or both. For example, the first configuration 220-a may indicate that UE 115-a will use one or more transmit / receive modes indicated in capability report 210. The first configuration 220-a may be indicated to UE 115-a via control messages (e.g., Radio Resource Control (RRC) messages, Downlink Control Information (DCI) messages, MAC-CE messages).

[0089] In some respects, the first configuration 220-a may instruct UE 115-a to communicate with base station 105-a using the set of receive ports of UE 115-a. For example, capability report 210 may indicate that UE 115-a supports 1T4R transmit / receive mode (e.g., a transmit / receive mode including a set of four receive ports). In this example, the first configuration 220-a may instruct that UE 115-a will use the set of four receive ports of UE 115-a to communicate with base station 105-a.

[0090] In some aspects, UE 115-a may transmit SRS 225-a on a set of transmit ports corresponding to the set of receive ports associated with the first configuration 220-a. In this respect, UE 115-a may transmit SRS 225-a according to the first configuration 220-a. In some cases, UE 115-a may transmit SRS 225-a during a first time interval associated with a first power state of UE 115-a. In some aspects, base station 105-a may be configured to measure the channel quality (e.g., determine CQI and / or rank) associated with communication between UE 115-a and base station 105-a based on the received SRS 225-a. In some aspects, UE 115-a may transmit SRS 225-a based on transmit capability report 210, receive the first configuration 220-a, or both.

[0091] For example, the first configuration 220-a may indicate that UE 115-a will use a set of four receive ports of UE 115-a to communicate with base station 105-a. In some aspects, each receive port in this set of receive ports may be associated with (e.g., correspond to) a corresponding transmit port at UE 115-a. In other words, the first receive port may correspond to the first transmit port, the second receive port may correspond to the second transmit port, the third receive port may correspond to the third transmit port, and the fourth receive port may correspond to the fourth transmit port. In this example, UE 115-a may transmit SRS 225-a according to the first configuration 220-a by transmitting SRS 225-a on the set of transmit ports (e.g., four transmit ports) corresponding to the set of receive ports (e.g., four receive ports) indicated in the first configuration 220-a.

[0092] In some aspects, UE 115-a may transmit SRS 225-a in a first time interval (e.g., first TTI, first timeslot, first subframe) associated with a first power state (e.g., normal or default power state) of UE 115-a. Additionally, UE 115-a may receive one or more signals (e.g., reference signals) from base station 105-a using (e.g., according to) a first configuration 220-a. For example, if the first configuration 220-a instructs UE 115-a to communicate with base station 105-a using a set of four receive ports, UE 115-a may receive signals from base station 105-a using each of those four receive ports. In this example, UE 115-a may be configured to decode Layer 4 downlink transmissions (e.g., Layer 4 Physical Downlink Shared Channel (PDSCH) transmissions) using the four receive ports.

[0093] In some respects, UE 115-a can determine that it operates in a second power state, which is lower than the first power state. In other words, UE 115-a can determine that it operates in a second power state (e.g., a reduced power state), which is lower than the first power state. At this point, UE 115-a can determine that one or more triggering conditions for transitioning to the reduced power state have been met.

[0094] UE 115-a can determine operation in the second power state based on any number of parameters or characteristics, including but not limited to the thermal state (e.g., temperature) at UE 115-a, the power level (e.g., battery level) at UE 115-a, or both. For example, Figure 1 This illustrates the thermal state (e.g., temperature T) at UE 115-a over time. skin T j (Image of a diagram.) Figure 1 As shown, the thermal state (e.g., temperature) at UE 115-a may increase over time due to communication or processing performed at UE 115-a, external temperature or heat source (e.g., direct sunlight, body temperature), or any combination thereof.

[0095] In some aspects, UE 115-a can be configured to transition from a first power state (e.g., a normal or default power state) to a second power state (e.g., a reduced power state) based on a comparison of the thermal state at UE 115-a with one or more threshold thermal states. Specifically, UE 115-a can determine operation in the second power state based on determining that the thermal state at UE 115-a satisfies a threshold thermal state. In some cases, the thermal state at UE 115-a may satisfy the threshold thermal state if the thermal state is greater than or equal to the threshold thermal state.

[0096] For example, such as Figure 1 As shown, the thermal state of UE 115-a (e.g., T) skin T j It is possible that at time T1, the threshold thermal state T becomes equal to or greater than the threshold thermal state T. thresh In this example, UE 115-a can determine whether to operate in the second power state at time T1 based on whether the thermal state of UE 115-a is greater than or equal to a threshold thermal state. It should be noted that different measures of thermal state can be associated with different threshold thermal states. For example, the skin temperature T at UE 115-a... skin It can be compared with the threshold skin temperature T thresh,skin Associated, enabling UE 115-a to be based on a determined T skin ≥T thresh,skin To determine operation in the second power state. As another example, the junction temperature T at UE 115-a skin It can be related to the threshold junction temperature T thresh,j Associated, enabling UE 115-a to be based on a determined T j ≥T thresh,j To determine operation in the second power state.

[0097] As another example, UE 115-a can be based on determining the power level (P) at UE 115-a. UE ) meets the threshold power level (P) thresh The power level of UE 115-a may include, but is not limited to, the battery level of UE 115-a. In some cases, the power level may meet the threshold power level if it is less than or equal to a threshold power level. In this respect, UE 115-a may determine operation in the second power state based on the determination that the power level of UE 115-a is less than or equal to the threshold power level (e.g., P). UE ≤P thresh This determines the operation under the second power state.

[0098] In some aspects, UE 115-a may determine one or more parameters associated with a set of receive ports of UE 115-a. The parameters associated with this set of receive ports may include, but are not limited to, Received Signal Strength Indicator (RSSI) metric, Reference Signal Received Power (RSRP) metric, Reference Signal Received Quality (RSRQ) metric, SNR, SINR, or any combination thereof. In some aspects, UE 115-a may determine the parameters of the receive ports based on transmit capability report 210, receive first configuration 220-a, communicate with base station 105-a according to first configuration 220-a (e.g., transmit SRS 225-a), or any combination thereof.

[0099] For example, if the first configuration 220-a instructs UE 115-a to communicate with base station 105-a using a set of four receive ports, UE 115-a can receive signals from base station 105-a using each of these four receive ports. In this example, UE 115-a can perform measurements (e.g., RSSI measurement, RSRP measurement, RSRQ measurement, SNR measurement, SINR measurement) on the signals received using each of the respective receive ports. At this point, UE 115-a can be configured to determine the relative strength or quality of the signals received using each of the respective receive ports.

[0100] In some aspects, UE 115-a can be configured to select a subset of the receive ports of UE 115-a. More specifically, UE 115-a can be configured to select a subset of the receive ports of UE 115-a, and can be configured to select a subset of the transmit ports corresponding to the selected subset of the receive ports of UE 115-a. In some aspects, UE 115-a can be configured to select the set of receive ports of UE 115-a based on the parameters of the determined receive ports, based on determining operation in a second power state, or both.

[0101] For example, UE 115-a can be configured to select a subset of receiver ports from the set of receiver ports that can be associated with the highest signal strength or quality. For example, when the first configuration 220-a is associated with four receiver ports, UE 115-a can be configured to select a subset of receiver ports (e.g., one or two receiver ports) associated with the highest RSSI metric, highest RSRP metric, highest RSRQ metric, highest SNR, highest SINR, or any combination thereof. Furthermore, UE 115-a can be configured to select a subset of transmit ports corresponding to the selected subset of receiver ports. For example, when UE 115-a selects a first receiver port and a second receiver port from this set of four receiver ports, UE 115-a can be further configured to select a first transmit port corresponding to the first receiver port and a second transmit port corresponding to the second receiver port.

[0102] In some aspects, UE 115-a may communicate with base station 105-a using fewer transmission ports than all transmission ports in the transmission port set used for SRS 225-b during a second time interval (e.g., a second TTI, a second timeslot, a second subframe) following a first time interval. In some aspects, UE 115-a may communicate with base station 105-a using fewer transmission ports than all transmission ports in the transmission port set used for SRS 225-b, based on transmission capability report 210, receiving first configuration 220-a, communicating with base station 105-a according to first configuration 220-a (e.g., transmitting SRS 225-a), determining operation in a second power state, determining parameters associated with the receiver port set, selecting a subset of receiver ports and / or transmission ports, or any combination thereof.

[0103] For example, based on determining that the thermal state at UE 115-a satisfies a threshold thermal state at time T1 (e.g., based on T...), skin ≥T thresh,skin T j ≥T thresh,j During the second time interval, UE 115-a may communicate with base station 105-a using fewer transmission ports than all transmission ports in the transmission port set used for SRS 225-b. Additionally or alternatively, based on determining that the power level at UE 115-a meets a threshold power level (e.g., based on P...), UE ≤P thresh UE 115-a may communicate with base station 105-a, or any combination thereof, during the second time interval using fewer transmit ports than all transmit ports in the transmit port set used for SRS 225-b.

[0104] In some respects, UE 115-a may communicate with base station 105-a using fewer transmit ports than all transmit ports in the transmit port set used for SRS 225-b, so that base station 105-a can schedule transmissions associated with lower rank at UE 115-a (e.g., reduced layer number). Furthermore, by scheduling transmissions associated with lower rank at base station 105-a, UE 115-a may be able to adjust the operating state of one or more receive ports of UE 115-a (e.g., deactivate one or more receive ports) to reduce power consumption at UE 115-a, thereby reducing the thermal state at UE 115-a. Therefore, in some cases, UE 115-a may communicate with base station 105-a using fewer transmit ports than all transmit ports in the transmit port set used for SRS 225-b, based on determining operation in a second power state (e.g., based on determining operation in a second power state at time T1), to reduce power consumption, save power levels (e.g., battery levels), and reduce the thermal state at UE 115-a (e.g., reduce T1). skin ,T j ).

[0105] For example, UE 115-a can be configured to avoid transmitting SRS 225-b on all transmit ports in the transmit port set at UE 115-a during the second time interval. For example, if UE 115-a includes a set of four receive ports and therefore a set of four transmit ports corresponding to these four receive ports, UE 115-a can avoid transmitting SRS 225-b on each of those four transmit ports. In this respect, UE 115-a can completely avoid transmitting any SRS 225-b on the transmit port set.

[0106] As another example, UE 115-a can be configured to transmit SRS 225-b on a subset of the set of transmitting ports at UE 115-a during a second time interval. For instance, if UE 115-a includes a set of four receive ports and therefore a set of four transmit ports corresponding to those four receive ports, UE 115-a may transmit SRS 225-b on one, two, or three of those four transmit ports. In this respect, UE 115-a may avoid transmitting SRS 225-b on one or more transmit ports in that set of transmit ports.

[0107] As previously described, base station 105-a can be configured to measure the channel quality associated with communication between UE115-a and base station 105-a based on received SRS 225-a and 225-b (e.g., determine CQI and / or rank). In this regard, communicating with base station 105-a using fewer transmit ports than all transmit ports in the set of transmit ports used for SRS 225-b (e.g., avoiding transmitting SRS 225-b, avoiding using a subset of transmit ports to transmit SRS 225-b) can result in different estimates of the channel quality at base station 105-a, which can be used to reduce the number of layers associated with the scheduled transmission at base station 105-a.

[0108] Furthermore, the number of transmission ports on a subset of transmission ports transmitting SRS 225-b can be based on the desired power consumption and / or thermal mitigation reduction level at UE 115-a. Specifically, reducing the number of transmission ports on which SRS 225-b is transmitted can reduce the rank of scheduled transmissions at base station 105-a, corresponding to a greater reduction in power consumption at UE 115-a. In this respect, completely avoiding transmission of SRS 225-b on the set of transmission ports can be associated with a greater reduction in power consumption at UE 115-a. Similarly, transmitting SRS 225-b on a single transmission port may result in a further reduction in the rank of scheduled transmissions compared to transmitting SRS 225-b on two transmission ports, and thus may result in a greater reduction in power consumption at UE 115-a. Therefore, the number of transmission ports on which UE 115-a transmits SRS 225-b can be based on the desired level of power consumption reduction at UE 115-a.

[0109] In some cases, in addition to implementing SRS-AS technology where UE 115-a reduces the number of transmit ports on which it transmits SRS 225-b, UE 115-a may further adjust the parameters reported to base station 105-a via CSF report 230 to further reduce the rank (e.g., number of layers) associated with the scheduled transmission at UE 115-a. In this regard, UE 115-a may use a combination of SRS-AS technology and CSF spoofing technology to reduce the rank of the scheduled transmission, thereby reducing power consumption and lowering power consumption and temperature (e.g., T) at UE 115-a. skin T j ).

[0110] For example, UE 115-a can determine the rank, CQI, or both associated with communication between UE 115-a and base station 105-a using one or more receive ports. In some aspects, UE 115-a can determine the rank and / or CQI associated with communication with base station 105-a using one or more receive ports based on the determination of operation in a second power state. When determining the rank and / or CQI associated with communication between UE 115-a and base station 105-a, UE 115-a can selectively adjust the determined rank, determined CQI, or both. In some aspects, UE 115-a can selectively adjust the determined rank and / or determined CQI based on the determination of operation in a second power state.

[0111] UE 115-a can be configured to selectively adjust the rank and / or CQI to further reduce the rank (e.g., number of layers) associated with scheduled transmissions at UE 115-a, which can result in reduced power consumption and temperature at UE 115-a. For example, UE 115-a can determine the rank associated with communication with base station 105-a using this set of receive ports by determining that it can support up to four layers of communication (e.g., rank 4). In this example, UE 115-a can selectively adjust the determined rank to generate an adjusted rank smaller than the determined rank (e.g., rank 3, rank 2, rank 1). The adjusted rank can then be reported to base station 105-a via CSF report 230 so that base station 105-a reduces the rank associated with transmissions scheduled at UE 115-a based on the adjusted rank.

[0112] As another example, UE 115-a can use its set of receive ports to determine the CQI associated with communication with base station 105-a. In this example, UE 115-a can selectively adjust the determined CQI to generate a smaller adjusted CQI (e.g., a lower quality CQI) than the determined CQI. At this point, UE 115-a can be configured to manually adjust the determined rank sum and / or the determined CQI to reduce the number of communication layers scheduled at UE 115-a.

[0113] Subsequently, UE 115-a may send a CSF report 230 to base station 105-a. In some aspects, the CSF report 230 may include an indication of an adjusted rank, an adjusted CQI, or both. In this regard, UE 115-a may send the CSF report 230 based on determining that it is operating in a second power state and selectively adjusting the determined rank and / or the determined CQI.

[0114] In some respects, UE 115-a can selectively adjust the rank and / or CQI reported to base station 105-a via CSF report 230 at 450 to reduce the number of layers associated with transmissions scheduled at UE 115-a. For example, by reporting an adjusted rank (e.g., a reduced rank) to base station 105-a via CSF report 230, base station 105-a can be configured to determine that UE 115-a cannot support a greater number of layers, and therefore the rank of transmissions scheduled at UE 115-a can be reduced based on the adjusted rank. Similarly, by reporting an adjusted CQI (e.g., a reduced CQI) to base station 105-a via CSF report 230, base station 105-a can be configured to determine that UE 115-a is experiencing a poor CQI, and therefore the rank of transmissions scheduled at UE 115-a can be reduced based on the adjusted CQI.

[0115] In some aspects, UE 115-a may use a combination of CSF spoofing and SRS-AS techniques to enable base station 105-a to reduce the rank (e.g., number of layers) associated with transmissions scheduled at UE 115-a. For example, according to some conventional techniques, UE 115-a may perform CSF spoofing, wherein UE 115-a reports a selectively adjusted (e.g., selectively reduced) rank sum and / or CQI to base station 105-a via CSF report 230. However, in some cases, instead of simply reducing the rank of the scheduled transmission based on the adjusted rank sum and / or CQI, base station 105-a may instead instruct UE 115-a to send SRS, allowing base station 105-a to directly determine the rank sum and / or CQI of the wireless communication between UE 115-a and base station 105-a. In this scenario, if UE 115-a does not implement the SRS-AS techniques described herein, base station 105-a can determine that the adjusted rank and / or CQI value reported to base station 105-b is inaccurate, thus avoiding a reduction in the rank of scheduled transmissions. Therefore, some techniques described herein can use a combination of CSF spoofing and SRS-AS techniques to increase the likelihood that base station 105-a can reduce the rank of transmissions scheduled at UE 115-a.

[0116] In some respects, UE 115-a may receive instructions for a second configuration 220-b from base station 105-a. As previously described herein, the second configuration 220-b may indicate one or more parameters associated with wireless communication between UE 115-a and base station 105-a, including the transmit / receive mode to be used at UE 115-a, the transmit port and / or receive port to be used by UE 115-a, or both. For example, the second configuration 220-b may instruct UE 115-a to communicate with base station 105-a using a first subset of the set of receive ports at UE 115-a. The second configuration 220-b may be instructed to UE 115-a via control messages (e.g., RRC messages, DCI messages, MAC-CE messages).

[0117] In some respects, UE 115-a may receive the second configuration 220-b based on communicating with base station 105-a, receiving CSF report 230, or both, using fewer transmit ports than all transmit ports used for SRS 225-b. For example, UE 115-a may receive the second configuration 220-b based on avoiding transmitting SRS 225-b on all transmit ports of UE 115-a (e.g., avoiding transmitting any SRS 225-b). As another example, UE 115-a may receive the second configuration 220-b based on transmitting SRS on a subset of transmit ports corresponding to a subset of receive ports of UE 115-a. In addition, in some cases, UE 115-a may receive the second configuration 220-b by communicating with base station 105-a using fewer transmission ports than all transmission ports used for SRS 225-b, combined with reporting selectively adjusted (e.g., selectively reduced) rank sum and / or CQI to base station 105-a via CSF report 230.

[0118] In some aspects, the second configuration 220-b can instruct UE 115-a to communicate with base station 105-a using a first subset of the set of receive ports at UE 115-a. In this respect, the second configuration 220-b can reduce the number of receive ports used at UE 115-a relative to the first configuration 220-a. For example, the first configuration 220-a can instruct UE 115-a to use a set of four receive ports at UE 115-a. Subsequently, UE 115-a can use a first transmit port and a second transmit port, respectively, corresponding to the first receive port and the second receive port. In this example, the second configuration 220-b can instruct UE 115-a to use a first receive port and a second receive port, corresponding to the first transmit port and the second transmit port. In this respect, the second configuration 220-b can reduce the number of receive ports used by UE 115-a from four receive ports to two receive ports (e.g., 2Rx backoff).

[0119] Therefore, UE 115-a can be configured to reduce power consumption at UE 115-b by implementing receive port backoff (e.g., 2Rx backoff, 1Rx backoff) by avoiding full transmission of SRS 225-b, using a subset of transmit ports corresponding to a subset of receive ports, transmitting CSF reports including selectively adjusted rank values, CQI values, or any combination thereof.

[0120] In some aspects, UE 115-a can selectively adjust one or more parameters associated with a second subset of its receive ports. In some aspects, UE 115-a can selectively adjust one or more parameters associated with a second subset of its receive ports to operate in a second power state (e.g., a reduced power state). Parameters associated with the adjustable second subset of the receive ports may include parameters associated with a low-noise amplifier (LNA), a phase shifter, or both. In some cases, UE 115-a can selectively adjust one or more parameters associated with a second subset of its receive ports to adjust the operating state of the second subset of the receive ports (e.g., deactivation), which may thereby reduce power consumption and / or temperature at UE 115-a. In some aspects, UE 115-a may selectively adjust the parameters associated with the second subset of its receive ports based on receiving a second configuration 220-b at 450.

[0121] For example, as previously described, the first configuration 220-a may instruct UE 115-a to use a set of four receive ports at UE 115-a (e.g., a first receive port, a second receive port, a third receive port, and a fourth receive port). Subsequently, the second configuration 220-b may instruct UE 115-a to use the second and fourth receive ports based on the identification that SRS 225-b was not transmitted / received, based on the identification that SRS 225-b was transmitted using a subset of the transmit ports, based on CSF report 230, or any combination thereof. Therefore, the first subset of receive ports indicated by the second configuration 220-b may include the second and fourth receive ports. In this example, UE 115-a may selectively adjust parameters associated with the first and third receive ports (e.g., a second subset of the receive ports) to reduce the power consumption of the first and third receive ports. For example, UE 115-a may deactivate the first and third receive ports by selectively adjusting parameters associated with the LNA, phase shifter, and / or other components of the first and third receive ports.

[0122] By having base station 105-a send a second configuration 220-b instructing UE 115-a to communicate using a subset of its receive ports, UE 115-a can effectively reduce the rank of scheduled transmissions at UE 115-a using the techniques described herein. Therefore, by effectively reducing the rank of scheduled transmissions, the techniques described herein can deactivate a subset of the receive ports at UE 115-a, which allows UE 115-a to enter a lower operating power state, reducing power consumption at UE 115-a and reducing temperature at UE 115-a (e.g., reducing TT). skin and / or T j Such power-saving technology enables UE 115-a to reduce power consumption at both the modem baseband and the RF transceiver of UE 115-a.

[0123] Subsequently, UE 115-a can communicate with base station 105-a according to the second configuration 220-b. In this regard, UE 115-a can communicate with base station 105-a by receiving signals using a first subset of the receive ports indicated in the second configuration 220-b. Furthermore, UE 115-a can communicate with base station 105-a by transmitting SRS 225 using a subset of transmit ports corresponding to the first subset of receive ports indicated in the second configuration 220-b. Therefore, compared to the communication performed according to the first configuration 220-a, UE 115-a can communicate with base station 105-a using a smaller number of layers (e.g., a reduced rank) according to the second configuration 220-b.

[0124] UE 115-a can communicate with base station 105-a based on receiving second configuration 220-b, selectively adjusting parameters associated with a second subset of the receive ports, or both. For example, second configuration 220-b can instruct UE 115-a to use a first subset of receive ports, including a first receive port and a third receive port. Subsequently, UE 115-a can deactivate the second and fourth receive ports to enter a second power state (e.g., a reduced power state). In this example, UE 115-a can communicate with base station 105-a according to second configuration 220-b by receiving downlink transmissions from base station 105-a using the first and third receive ports. In this example, UE 115-a can be configured to use the first and third receive ports to decode two-layer downlink transmissions (e.g., two-layer PDSCH transmissions).

[0125] In some respects, UE 115-a may subsequently cause base station 105-a to increase the number of layers associated with the transmission scheduled at UE 115-a. For example, when communicating with base station 105-b according to second configuration 220-b, UE 115-a may subsequently determine that it can return to a first power state higher than the second power state (e.g., the default power state, or other power states). UE 115-a may determine that its thermal state no longer satisfies a threshold thermal state (e.g., based on determining T...). skin <T thresh,skin and / or T j <T thresh,j ) or another thermal state, based on determining that the power level (e.g., battery level) of UE 115-a no longer meets the threshold power level (e.g., based on determining P UE >P thresh (or both) to determine the return to the first power state.

[0126] For example, such as Figure 2 As shown in the figure, UE 115-a can implement thermal mitigation and power saving techniques at some time after time T1 (e.g., based on satisfying a threshold thermal state T). thresh The UE 115-b is in a thermal state T, as previously described herein. UE 115-a can then transition to a second power state at some point after time T1, which can reduce the thermal state of UE 115-b (e.g., reduce temperature). In this example, UE 115-a can determine whether it can switch back to a first power state (e.g., normal or default power state) based on whether its thermal state does not meet a threshold thermal state, or based on whether its thermal state meets a different threshold thermal state, or both.

[0127] For example, refer to Figure 2As shown in the diagram, UE 115-a can be based on identifying thermal states (e.g., T). skin T j The threshold thermal state (T) cannot be satisfied. thresh This determines whether to operate in the first hot state (e.g., return to the first hot state). For example, UE 115-a could determine (return to) operating in the first hot state based on identifying a hot state less than a threshold hot state (e.g., if T...). skin <T thresh , or T j <T thresh Then return to the first power state).

[0128] As another example, continue to refer to Figure 2 As shown in the diagram, UE 115-a can be based on identifying thermal states (e.g., T). skin T j Satisfying the threshold thermal state T thresh A different (e.g., below the threshold thermal state) second threshold thermal state (T thresh,2 This determines whether to operate in the first hot state (e.g., return to the first hot state). In some cases, if the hot state at UE115-a is less than or equal to the second hot state, then the hot state can satisfy the second threshold hot state. For example, UE115-a can determine whether to operate in the first hot state (e.g., return to the first hot state) based on recognizing that the hot state at UE115-a is less than or equal to the second threshold hot state (e.g., if T...). skin ≤T thresh,2 , or T j ≤T thresh,2 (Then it operates in the first power state). By comparing the thermal state at UE 115-a with that of the first thermal state T thresh Lower second thermal state T thresh,2 In comparison, the thermal mitigation techniques described herein can ensure that UE 115-a has the opportunity to cool sufficiently before UE 115-a returns to a first power state (e.g., normal or default power state).

[0129] When it is determined that UE 115-a is to operate in the first power state, UE 115-a may use an increased number of transmit ports corresponding to the increased number of receive ports to transmit SRS 225. For example, in the case where the second configuration 220-b includes two receive ports (e.g., 2Rx), UE 115-a may use four transmit ports corresponding to four receive ports (e.g., 4Rx) to transmit SRS, thereby increasing the number of layers associated with the transmissions scheduled at UE 115-a by base station 105-a. Additionally or alternatively, UE 115-a may transmit a CSF report 230 indicating a higher rank and / or a higher CQI (e.g., rank 4) to further increase the number of layers associated with the transmissions scheduled at UE 115-a by base station 105-a.

[0130] UE 115-a can implement the power-saving techniques described herein for a finite duration until such power-saving techniques are no longer needed. In other words, UE 115-a can implement the techniques described herein to reduce the power level at UE 115-a, thereby correspondingly reducing the power consumption and / or temperature of UE 115-a. Subsequently, when the temperature of UE 115-a (e.g., T...)... skin T j Below the threshold temperature (e.g., T) thresh,skin ,T thresh,j ,T thresh,2 ), and / or when the power level of UE 115-a (e.g., P UE The battery level rises to a threshold power level (e.g., P). thresh When above, UE 115-a can send SRS 225 and / or CSF report 230 to return to the first power state and / or the first configuration 220-a.

[0131] The techniques described herein enable UE 115-a to reduce its power state, thereby reducing power consumption and temperature. Specifically, the techniques described herein enable UE 115-a to perform SRS-AS, whereby UE 115-a avoids transmitting SRS 225-b and / or uses a subset of the transmit ports to transmit SRS 225-b, thereby allowing base station 105-a to reduce the rank of the scheduled transmission. In this regard, by reducing the rank of the scheduled transmission at base station 105-a, UE 115-a can deactivate one or more receive ports, thereby enabling UE 115-a to enter a lower power state, reducing power consumption and temperature. This thermal mitigation and power-saving technique enables UE 115-a to reduce power consumption at its modem baseband and RF transceiver components.

[0132] Figure 3A and Figure 3B Examples of communication schemes 300-a and 300-b, respectively, supporting techniques for thermal mitigation and power saving according to aspects of this disclosure, are shown. In some examples, communication schemes 300-a and / or 300-b may implement or be implemented by aspects of wireless communication system 100, wireless communication system 200, or both.

[0133] In some respects, Figure 3A and Figure 3B The components of UE 115-b can be described, which may include references. Figure 1 and Figure 2 An example of UE 115 is shown and described. In some aspects, UE 115-b may include a set of receive ports 305, which includes one or more receive ports 315. For example, UE 115-b may include a set of receive ports 305 including a first receive port 315-a, a second receive port 315-b, a third receive port 315-c, and a fourth receive port 315-d (e.g., 4Rx). Similarly, UE 115-b may include a set of transmit ports 310, which includes one or more transmit ports 320. For example, UE 115-b may include a set of transmit ports 310, which includes a first transmit port 320-a, a second transmit port 320-b, a third transmit port 320-c, and a fourth transmit port 320-d (e.g., 4Tx). In this respect, UE 115-b may be configured to support multiple transmit / receive modes (e.g., 1T4R, 2T4R, etc.). However, it should be noted in this document that UE 115-b may include any number of receive ports 315 and / or any number of transmit ports 320 to support additional transmit / receive modes.

[0134] In some aspects, each receive port 315 in the set of receive ports 305 may correspond to a transmit port 320 in the set of transmit ports 310, and vice versa. For example, a first receive port 315-a may correspond to a first transmit port 320-a, a second receive port 315-b may correspond to a second transmit port 320-b, a third receive port 315-c may correspond to a third transmit port 320-c, and a fourth receive port 315-d may correspond to a fourth transmit port 320-d. In some aspects, each transmit port 320 may be configured to detect SRS (e.g., transmit SRS) for each of the respective receive ports 315 (e.g., the first transmit port 320-a detects the SRS for the first receive port 315-a, the second transmit port 320-b detects the SRS for the second receive port 315-b, and so on).

[0135] According to some implementations, UE 115-b can be configured to communicate with base station 105 using receive port set 305 according to a first configuration during a first time interval, and subsequently to communicate with base station 105 using fewer transmit ports than all transmit ports in transmit port set 310 for SRS during a second time interval, so that base station 105 reduces the rank of the transmissions scheduled at UE 115-b.

[0136] For example, when operating in a first power state (e.g., normal or default power state), UE 115-a may receive an indication of a first configuration for communication between UE 115-b and base station 105. The first configuration may indicate one or more parameters associated with wireless communication between UE 115-b and base station 105, including the transmit / receive mode to be used at UE 115-b, transmit port 320 and / or receive port 315 to be used by UE 115-b, or both. For example, the first configuration may indicate that UE 115-b will communicate with base station 105 using each receive port 315 in the set of receive ports 305 of UE 115-c (e.g., indicating 4Rx).

[0137] Subsequently, as Figure 3A The communication configuration shown is 325-a and Figure 3BAs shown in communication configuration 325-b, UE 115-b can communicate with base station 105-b according to a first configuration during a first time interval 330-a (e.g., a first TTI, a first time slot, a first subframe). For example, if the first configuration instructs UE 115-b to communicate with base station 105 using all four receive ports 315 of receive port set 305, UE 115-b can transmit SRS on each transmit port 320 in transmit port set 310 corresponding to each receive port 315 of receive port set 305 during the first time interval 330-a. For example, as shown in communication configurations 325-a and 325-b, UE 115-a can use each of the first transmit port 320-a, the second transmit port 320-b, the third transmit port 320-c, and the fourth transmit port 320-d to transmit SRS.

[0138] The SRS transmitted according to the first configuration in the first time interval 330-a is shown as being transmitted at different times within the first time interval 330-a. However, in additional or alternative cases, the SRS transmitted (e.g., probes) in the first time interval 330-a may be transmitted such that the SRS at least partially overlap each other in the time domain. In this respect, the SRS may be transmitted according to different modulation schemes, in different frequency bands (e.g., different carriers, different component carriers), or any combination thereof, such that the transmission of two or more SRS at least partially overlaps each other in the time domain. For example, UE 115-b may transmit a first SRS via a first transmission port 320-a and a second SRS via a second transmission port 320-b. In this example, the first SRS may be transmitted on a first carrier and the second SRS may be transmitted on a second carrier, wherein the first SRS and the second SRS at least partially overlap in the time domain.

[0139] During or after the first time interval 330-a, UE 115-a may determine to operate in a second power state lower than the first power state. In other words, UE 115-b may determine to operate in a second power state (e.g., a reduced power state) lower than the first power state based on the determination that one or more trigger conditions for transitioning to a low-power state have been met. As previously described herein, UE 115-b may determine to operate in the second power state based on any number of parameters or characteristics, including but not limited to the thermal state at UE 115-b, the power level at UE 115-b (e.g., battery level), or both.

[0140] In some respects, when operating in the second power state, UE 115-b can communicate with base station 105 using fewer transmission ports than all transmission ports 320 used for SRS during the second time interval 330-b following the first time interval 330-a. For example, as Figure 3A As shown in the communication configuration 325-a, UE 115-b can avoid transmitting SRS on all transmit ports 320 of the transmit port set 310 during the second time interval 330-b. Therefore, in some examples, UE 115-a can completely avoid transmitting SRS during the second time interval 330-b.

[0141] By avoiding the transmission of SRS on all transmit ports 320 of the transmit port set 320 during the second time interval 330-b, as shown in communication configuration 325-a, UE 115-b can be configured to cause base station 105 to reduce the rank associated with the transmissions scheduled at UE 115-b (e.g., reduce the number of layers). Therefore, by causing base station 105 to reduce the rank and / or number of scheduled transmission layers, the techniques described herein enable UE 115-b to enter a second power state (e.g., a lower power state) by shutting down, deactivating, or otherwise disabling one or more receive ports 315 in the receive port set 305. Therefore, by enabling UE 115-b to deactivate one or more receive ports 315 and operate in the second power state, the techniques described herein enable UE 115-b to reduce its thermal state (e.g., skin temperature, junction temperature), reduce power consumption, and save power.

[0142] For example, by avoiding sending SRS in the second time interval 330-b, UE 115-b can reduce the scheduled transmissions to rank two (e.g., two layers) for the base station, thereby enabling UE 115-b to disable two receive ports 315 in the receive port set 305 (e.g., 2Rx backoff). As another example, by avoiding sending SRS in the second time interval 330-b, UE 115-b can reduce the scheduled transmissions to rank one (e.g., one layer) for the base station, thereby enabling UE 115-b to disable three receive ports 315 in the receive port set 305 (e.g., 1Rx backoff).

[0143] In additional or alternative implementations, UE 115-b can be configured to cause base station 105 to reduce the rank of scheduled transmissions by transmitting SRS on a subset of transmit ports 320. For example, as Figure 3B As shown in the communication configuration 325-b, UE115-b can transmit SRS using fewer transmission ports than all transmission ports 320 in the transmission port set 310 during the second time interval. For example, as Figure 3BAs shown, UE 115-b can transmit the first SRS via the second transmission port 320-b and the second SRS via the fourth transmission port 320-d during the second time interval 330-b (e.g., avoiding transmission of SRS on the first transmission port 320-a and the third transmission port 320-c).

[0144] As shown in communication configuration 325-a, UE 115-b can be configured to cause base station 105 to reduce the rank (e.g., reduce the number of layers) associated with the transmissions scheduled at UE 115-b by transmitting SRS on fewer transmission ports than all transmission ports 320 of transmission port set 320 during the second time interval 330-b. Therefore, by causing base station 105 to reduce the rank and / or number of scheduled transmission layers, the techniques described herein enable UE 115-b to enter a second power state (e.g., a lower power state) by shutting down, deactivating, or otherwise disabling one or more receiver ports 315 in receiver port set 305. Therefore, by enabling UE 115-b to deactivate one or more receiver ports 315 and operate in the second power state, the techniques described herein enable UE 115-b to reduce the thermal state (e.g., skin temperature, junction temperature) at UE 115-c, reduce power consumption, and save power.

[0145] In some respects, UE 115-b can be configured to select which transmit ports 320 will be used to transmit SRS during the second time interval 330-b based on one or more parameters associated with the receive port set 305, the transmit port set 310, or both. Parameters associated with the receive port set 305 may include, but are not limited to, RSSI metric, RSRP metric, RSRQ metric, SNR, SINR, or any combination thereof.

[0146] For example, if the first configuration instructs UE 115-b to communicate with base station 105 using each of the receiver ports 310 in the receiver port set 305, UE 115-b can receive signals from base station 105 using each of the receiver ports 310 in the receiver port set 305. In this example, UE 115-b can perform measurements (e.g., RSSI measurement, RSRP measurement, RSRQ measurement, SNR measurement, SINR measurement) on the signals received using each of the respective receiver ports 310. At this point, UE 115-b can be configured to determine the relative strength or quality of the signals received using each of the respective receiver ports 310.

[0147] Subsequently, UE 115-b can be configured to select a subset 310 of the receive ports in the set of receive ports 305. In some aspects, UE 115-b can be configured to select a subset of the receive ports 310 based on determined parameters for each receive port 310. In some cases, UE 115-b may select a subset of the receive ports 310 associated with higher signal strength, higher signal quality, or both. Subsequently, UE 115-b can transmit SRS within a second time interval 330-b using a subset 320 of transmit ports corresponding to the determined subset of receive ports 315.

[0148] For example, when the first configuration is associated with each receive port in the receive port set 305, UE 115-b can determine that the second receive port 315-b and the fourth receive port 315-d can be associated with the highest RSSI metric, the highest RSRP metric, the highest RSRQ metric, the highest SNR, the highest SINR, or any combination thereof. In this respect, UE 115-b can select the second and fourth receive ports 315 to include them in a subset of the receive ports 315. UE 115-b can also be configured to select a subset of transmit ports 320 corresponding to the selected subset of receive ports 315. For example, if UE 115-c selects the second receive port 315-b and the fourth receive port 315-d to include them in the subset of receive ports 315, UE 115-b can also be configured to select the second transmit port 320-b corresponding to the second receive port 315-b and the fourth transmit port 320-d corresponding to the fourth receive port 315-d. Subsequently, as shown in communication configuration 325-b, UE 115-b can then use the second transmission port 320-b and the fourth transmission port 320-d to transmit SRS during the second time interval.

[0149] Figure 4 An example of a process flow 400 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. In some examples, process flow 400 may implement, or be implemented by, aspects of wireless communication system 100, wireless communication system 200, communication schemes 300-a and 300-b, or any combination thereof. For example, process flow 400 may illustrate UE115-c transmitting SRS according to a first configuration, determining to operate in a reduced power state, communicating with base station 105-b using fewer transmission ports than all transmission ports used for SRS, and receiving a second configuration for wireless communication with base station 105-b, as referenced. Figure 1 -As shown in Figure 3. In some cases, process flow 400 may include UE 115-c and base station 105-b, which may be examples of the corresponding devices described herein.

[0150] In some examples, the operations illustrated in process flow 400 may be performed by hardware (e.g., including circuitry, processing blocks, logic components, and other components), code executed by a processor (e.g., software or firmware), or any combination thereof. Alternative examples are possible, in which some steps may be performed in a different order than described or not at all. In some cases, steps may include additional features not mentioned below, or additional steps may be added.

[0151] At 405, UE 115-c can send a capability report to base station 105-b. In some aspects, the capability report may include an indication of one or more transmit / receive modes supported by UE 115-c. For example, the capability report may indicate that UE 115-c supports a transmit / receive mode including one transmit port and four receive ports (e.g., 1T4R), a transmit / receive mode including two transmit ports and four receive ports (e.g., 2T4R), or both. UE 115-c can be configured to support any number or type of transmit / receive modes, including any number of transmit ports, any number of receive ports, or both.

[0152] At 410, base station 105-b may send an indication of a first configuration for communication between UE 115-c and base station 105-b. The first configuration may indicate one or more parameters associated with wireless communication between UE 115-c and base station 105-b, including the transmit / receive mode to be used at UE 115-c, the transmit port and / or receive port to be used by UE 115-c, or both. For example, the first configuration may indicate that UE 115-c will use one or more transmit / receive modes indicated in the capability report sent at 405. The first configuration may be indicated to UE 115-c via control messages (e.g., RRC messages, DCI messages, MAC-CE messages).

[0153] In some respects, the first configuration may indicate that UE 115-c will communicate with base station 105-b using the set of receive ports of UE 115-c. For example, a capability report 115 sent by UE 115-c may indicate that UE 115-c supports 1T4R transmit / receive mode (e.g., a transmit / receive mode including a set of four receive ports). In this example, the first configuration may indicate that UE 115-c will use the set of four receive ports of UE 115-c to communicate with base station 105-b.

[0154] At 415, UE 115-c may transmit SRS on the set of transmit ports corresponding to the set of receive ports associated with the first configuration. At this point, UE 115-c may transmit SRS according to the first configuration indicated at 410. In some cases, UE 115-c may transmit SRS at 415 during a first time interval associated with a first power state of UE 115-a. In some aspects, base station 105-b may be configured to measure the channel quality associated with communication between UE 115-c and base station 105-b (e.g., determine CQI and / or rank) based on the received SRS. In some aspects, UE 115-c may transmit SRS at 415 based on transmitting a capability report at 405, receiving the first configuration at 410, or both.

[0155] For example, the first configuration might indicate that UE 115-c will use a set of four receive ports of UE 115-c to communicate with base station 105-b. As previously described herein, each receive port in this set of receive ports may be associated with (e.g., correspond to) a corresponding transmit port at UE 115-c. In other words, the first receive port may correspond to the first transmit port, the second receive port may correspond to the second transmit port, the third receive port may correspond to the third transmit port, and the fourth receive port may correspond to the fourth transmit port. In this example, UE 115-c may transmit SRS at 415 according to the first configuration by transmitting SRS on the set of transmit ports (e.g., four transmit ports) corresponding to the set of receive ports (e.g., four receive ports) indicated in the first configuration.

[0156] In some respects, UE 115-c may transmit SRS at 415 during a first time interval (e.g., first TTI, first timeslot, first subframe) associated with a first power state (e.g., normal or default power state) of UE 115-c. In some cases, UE 115-c may communicate with base station 105-b while operating in the first power state (e.g., default power state) until one or more triggering conditions for transitioning to a second power state (e.g., a lower or reduced power state) are met. As previously mentioned, the first power state may be associated with a higher power consumption level compared to the second power state.

[0157] Additionally, UE 115-c can receive one or more signals (e.g., reference signals) from base station 105-b using (e.g., according to) a first configuration. For example, if the first configuration instructs UE 115-c to communicate with base station 105-b using a set of four receive ports, UE 115-c can receive signals from base station 105-b using each of those four receive ports. In this example, UE 115-c can be configured to decode Layer 4 downlink transmissions (e.g., Layer 4 PDSCH transmissions) using the four receive ports.

[0158] At 420, UE 115-c can determine that it is operating in a second power state, which is lower than the first power state. In other words, UE 115-c can determine that it is operating in a second power state (e.g., a reduced power state), which is lower than the first power state. At this point, UE 115-c can determine that one or more triggering conditions for transitioning to the reduced power state have been met.

[0159] UE 115-c can determine operation in the second power state based on any number of parameters or characteristics, including but not limited to the thermal state at UE 115-c, the power level at UE 115-c (e.g., battery level), or both. For example, UE 115-c can determine operation in the second power state based on whether the thermal state at UE 115-c meets a threshold thermal state (T). thresh This determines operation in the second power state. In some cases, the thermal state may satisfy the threshold thermal state if the thermal state is greater than or equal to it. Furthermore, the thermal state may include, but is not limited to, the skin temperature (T) of the UE 115-c. skin Junction temperature (T) of UE 115-c j ) or both. In this regard, UE 115-c can be based on determining that the skin temperature of UE 115-c is greater than or equal to a threshold skin temperature (e.g., T). skin ≥T thresh,skin Based on determining that the junction temperature of UE 115-c is greater than or equal to a threshold junction temperature (e.g., T...), j ≥T thresh,j ), or both, to determine operation in the second power state.

[0160] As another example, UE 115-c can be based on determining the power level (P) at UE 115-c. UE ) meets the threshold power level (P) threshThe power level of UE 115-c can be determined based on whether it is less than or equal to a threshold power level. The power level of UE 115-c may include, but is not limited to, the battery level of UE 115-c. In some cases, the power level may satisfy the threshold power level if it is less than or equal to a threshold power level. In this respect, UE 115-c may determine whether its power level is less than or equal to a threshold power level (e.g., P...). UE ≤P thresh This determines the operation under the second power state.

[0161] At 425, UE 115-a can determine one or more parameters associated with the set of receive ports of UE 115-c. The parameters associated with the set of receive ports may include, but are not limited to, RSSI metric, RSRP metric, RSRQ metric, SNR, SINR, or any combination thereof. In some aspects, UE 115-c may determine the parameters of the receive ports based on transmitting a capability report at 405, receiving a first configuration at 410, communicating with base station 105-b according to the first configuration at 415, or any combination thereof.

[0162] For example, if the first configuration instructs UE 115-c to communicate with base station 105-b using a set of four receive ports, UE 115-c can receive signals from base station 105-b using each of these four receive ports. In this example, UE 115-c can perform measurements (e.g., RSSI measurement, RSRP measurement, RSRQ measurement, SNR measurement, SINR measurement) on the signals received using each of the respective receive ports. At this point, UE 115-c can be configured to determine the relative strength or quality of the signals received using each of the respective receive ports.

[0163] At 430, UE 115-c can be configured to select a subset of the receive ports of UE 115-c. More specifically, UE 115-c can be configured to select a subset of the receive ports of UE 115-c, and can be configured to select a subset of the transmit ports corresponding to the selected subset of the receive ports of UE 115-c. In some aspects, UE 115-c can be configured to select the set of receive ports of UE 115-c based on the parameters of the receive ports determined at 425.

[0164] For example, UE 115-c can be configured to select a subset of receiver ports from the set of receiver ports that can be associated with the highest signal strength or quality. For instance, in a first configuration associated with four receiver ports, UE 115-c can be configured to select a subset of receiver ports (e.g., one or two receiver ports) associated with the highest RSSI metric, highest RSRP metric, highest RSRQ metric, highest SNR, highest SINR, or any combination thereof. Furthermore, UE 115-c can be configured to select a subset of transmit ports corresponding to the selected subset of receiver ports. For example, if UE 115-c selects a first receiver port and a second receiver port from this set of four receiver ports, UE 115-c can be further configured to select a first transmit port corresponding to the first receiver port and a second transmit port corresponding to the second receiver port.

[0165] At 435, UE 115-c may communicate with base station 105-b using fewer than the entire set of transmit ports used for SRS during a second time interval (e.g., a second TTI, a second time slot, a second subframe) following the first time interval. In some aspects, UE 115-c may communicate with base station 105-b using fewer transmit ports than all transmit ports in the transmit port set used for SRS at 425, based on transmitting a capability report at 405, receiving a first configuration at 410, communicating with base station 105-b according to the first configuration at 415, determining operation in a second power state at 420, determining parameters associated with the set of receive ports at 425, selecting a subset of receive ports and / or transmit ports at 430, or any combination thereof.

[0166] For example, based on determining that the thermal state at UE 115-c meets the threshold thermal state (e.g., based on T... skin ≥T thresh,skin ,T j ≥T thresh,j Based on determining that the power level at UE 115-c meets the threshold power level (e.g., based on P), UE ≤P thresh ), or any combination thereof, UE 115-c may communicate with base station 105-b during the second time interval using fewer transmit ports than all transmit ports in the set of transmit ports used for SRS.

[0167] In some respects, UE 115-c may communicate with base station 105-b using fewer transmit ports than all transmit ports in the transmit port set at 435, so that base station 105-b can schedule transmissions associated with lower rank at UE 115-c (e.g., reduced layer number). Furthermore, by having base station 105-b schedule transmissions associated with lower rank, UE 115-c may be able to adjust the operating state of one or more receive ports of UE 115-c (e.g., deactivate one or more receive ports) to reduce power consumption at UE 115-c, thereby reducing the thermal state at UE 115-c. Therefore, in some cases, UE 115-c may communicate with base station 105-b using fewer transmit ports than all transmit ports in the transmit port set at 435, based on determining operation in a second power state at 420, to reduce power consumption and save power levels (e.g., battery levels) at UE 115-c.

[0168] For example, at 435, UE 115-c can be configured to avoid transmitting SRS on all transmit ports in the transmit port set at UE 115-c during the second time interval. For example, if UE 115-c includes a set of four receive ports and therefore a set of four transmit ports corresponding to these four receive ports, UE 115-c can avoid transmitting SRS on each of these four transmit ports. At this point, UE 115-c can completely avoid transmitting any SRS on the transmit port set.

[0169] As another example, at 435, UE 115-c can be configured to transmit SRS on a subset of the set of transmit ports in the UE 115-c during the second time interval. For example, if UE 115-c includes a set of four receive ports and therefore a set of four transmit ports corresponding to those four receive ports, UE 115-c may transmit SRS on one, two, or three of those four transmit ports. In this respect, UE 115-c may avoid transmitting SRS on one or more transmit ports in that set of transmit ports.

[0170] In some cases, in addition to the SRS-AS technique described in steps 405 to 430 of the execution process flow 400, UE 115-c may further adjust the parameters reported to base station 105-b via CSF report to further reduce the rank (e.g., number of layers) associated with the transmission scheduled at UE 115-c. In this regard, UE 115-c may use a combination of SRS-AS technique and CSF report spoofing technique to reduce the rank of the scheduled transmission, and thus reduce power consumption and power consumption and temperature (e.g., T) at UE 115-c. skin T j This can be further understood by referring to steps 440-450 of process flow 400.

[0171] At 440, UE 115-c may determine the rank, CQI, or both associated with communication between UE 115-c and base station 105-b using one or more receive ports. In some aspects, UE 115-c may determine the rank and / or CQI associated with communication using one or more receive ports and base station 105-b based on transmitting a capability report at 405, receiving a first configuration at 410, communicating with base station 105-b according to the first configuration at 415, determining operation in a second power state at 420, determining parameters associated with a set of receive ports at 425, selecting a subset of receive ports and / or transmit ports at 430, communicating using fewer transmit ports than all transmit ports used for SRS at 435, or any combination thereof.

[0172] At 445, UE 115-c can selectively adjust the rank sum and / or CQI determined at 440. In some aspects, UE 115-c can selectively adjust the determined rank sum and / or CQI at 445 based on the following operations: transmitting a capability report at 405, receiving a first configuration at 410, communicating with base station 105-b according to the first configuration at 415, determining operation in a second power state at 420, determining parameters associated with a set of receive ports at 425, selecting a subset of receive ports and / or transmit ports at 430, communicating using fewer transmit ports than all transmit ports used for SRS at 435, determining the rank sum and / or CQI at 440, or any combination thereof. UE 115-c can be configured to selectively adjust the rank and / or CQI to further reduce the rank (e.g., number of layers) associated with the scheduled transmission at UE 115-c by base station 105-b, which can result in reduced power consumption and temperature at UE 115-c.

[0173] At 450, UE 115-c may send a CSF report to base station 105-b. In some aspects, the CSF report may include an indication of the adjusted rank, adjusted CQI, or both generated at 445. At this point, UE 115-c may send the CSF report based on: sending a capability report at 405, receiving a first configuration at 410, communicating with base station 105-b according to the first configuration at 415, determining operation in a second power state at 420, determining parameters associated with the set of receive ports at 425, selecting a subset of receive ports and / or transmit ports at 430, communicating using fewer transmit ports than all transmit ports used for SRS at 435, determining the rank and / or CQI at 440, selectively adjusting the determined rank and / or CQI at 445, or any combination thereof.

[0174] In some respects, UE 115-c can selectively adjust the rank and / or CQI reported to base station 105-b via CSF at 450 to reduce the number of layers associated with transmissions scheduled at UE 115-c. For example, by reporting an adjusted rank (e.g., a reduced rank) to base station 105-b via CSF, base station 105-b can be configured to determine that UE 115-c cannot support a greater number of layers, and therefore can reduce the rank of transmissions scheduled at UE 115-c based on the adjusted rank. Similarly, by reporting an adjusted CQI (e.g., a reduced CQI) to base station 105-b via CSF, base station 105-b can be configured to determine that UE 115-c is experiencing a poor CQI, and therefore can reduce the rank of transmissions scheduled at UE 115-c based on the adjusted CQI.

[0175] In some respects, UE 115-c may use a combination of CSF spoofing and SRS-AS techniques to enable base station 105-b to reduce the rank (e.g., number of layers) associated with transmissions scheduled at UE 115-c. For example, according to some conventional techniques, UE 115-c may perform CSF spoofing, where UE 115-c reports a selectively adjusted (e.g., selectively reduced) rank sum and / or CQI to base station 105-b via CSF reporting. However, in some cases, instead of simply reducing the rank of a scheduled transmission based on the adjusted rank sum and / or CQI, base station 105-b may instead instruct UE 115-c to send SRS, allowing base station 105-b to directly determine the rank sum and / or CQI of the wireless communication between UE 115-c and base station 105-b. In this scenario, if UE 115-c does not implement the SRS-AS technique described herein, base station 105-b can determine that the adjusted rank and / or CQI value reported to base station 105-b is inaccurate, thus avoiding a reduction in the rank of scheduled transmissions. Therefore, some techniques described herein can use a combination of CSF spoofing and SRS-AS techniques to increase the likelihood that base station 105-b can be induced to reduce the rank of transmissions scheduled at UE 115-c.

[0176] At 455, UE 115-c can receive an indication of a second configuration from base station 105-b. As previously described herein, the second configuration may indicate one or more parameters associated with wireless communication between UE 115-c and base station 105-b, including the transmit / receive mode to be used at UE 115-c, the transmit port and / or receive port to be used by UE 115-c, or both. For example, the second configuration may instruct UE 115-c to communicate with base station 105-b using a first subset of the set of receive ports at UE 115-c. The second configuration may be indicated to UE 115-c via control messages (e.g., RRC messages, DCI messages, MAC-CE messages).

[0177] In some respects, UE 115-c may receive a second configuration at 455 based on communicating with base station 105-b using fewer transmission ports than all transmission ports used for SRS at 435, receiving a CSF report at 450, or both. For example, UE 115-c may receive the second configuration at 455 based on avoiding transmitting SRS on all transmission ports of UE 115-c at 435. As another example, UE 115-c may receive the second configuration at 455 based on transmitting SRS on a subset of transmission ports corresponding to a subset of the receiving ports of UE 115-c at 435. Furthermore, in some cases, UE 115-c may receive the second configuration at 455 based on communicating with base station 105-b using fewer transmission ports than all transmission ports used for SRS at 435, combined with reporting a selectively adjusted (e.g., selectively reduced) rank sum and / or CQI to base station 105-b via a CSF report at 450.

[0178] In some aspects, the second configuration may instruct UE 115-c to communicate with base station 105-b using a first subset of the set of receive ports at UE 115-c. In this respect, the second configuration may reduce the number of receive ports used at UE 115-c relative to the first configuration. For example, the first configuration may instruct UE 115-c to use a set of four receive ports at UE 115-c. Subsequently, at 435, UE 115-c may use a first transmit port and a second transmit port, respectively, corresponding to the first receive port and the second receive port. In this example, the second configuration may instruct UE 115-c to use the first receive port and the second receive port, corresponding to the first transmit port and the second transmit port. In this respect, the second configuration may reduce the number of receive ports used by UE 115-c from four receive ports to two receive ports.

[0179] At 460, UE 115-c can selectively adjust one or more parameters associated with a second subset of its receive ports. In some aspects, UE 115-c can selectively adjust one or more parameters associated with the second subset of its receive ports to operate under a second power state (e.g., a reduced power state) determined at 430. Parameters associated with the adjustable second subset of the receive ports may include parameters associated with an LNA, a phase shifter, or both. In some cases, UE 115-c can selectively adjust one or more parameters associated with the second subset of its receive ports to adjust the operating state of the second subset of the receive ports (e.g., deactivation), which may thereby reduce power consumption and / or temperature at UE 115-c. In some aspects, UE 115-c may selectively adjust the parameters associated with the second subset of its receive ports based on a second configuration received at 455.

[0180] For example, as described above, the first configuration may instruct UE 115-c to use a set of four receive ports at UE 115-c (e.g., a first receive port, a second receive port, a third receive port, and a fourth receive port). Subsequently, at 435, UE 115-c may use the second transmit port and the fourth transmit port, respectively, corresponding to the second receive port and the fourth receive port. In this example, the second configuration may instruct UE 115-c to use the second receive port and the fourth receive port based on the SRS received at 435. Therefore, a first subset of the receive ports indicated by the second configuration may include the second and fourth receive ports. In this example, UE 115-c may selectively adjust parameters associated with the first and third receive ports (e.g., a second subset of the receive ports) to reduce the power consumption of the first and third receive ports. For example, UE 115-c may deactivate the first and third receive ports by selectively adjusting parameters associated with the LNA, phase shifter, and / or other components of the first and third receive ports.

[0181] By having base station 105-b send a second configuration instructing UE 115-c to communicate using a subset of its receive ports, UE 115-c can effectively reduce the rank of scheduled transmissions at UE 115-c using the techniques described herein. Therefore, by effectively reducing the rank of scheduled transmissions, the techniques described herein can deactivate a subset of the receive ports at UE 115-c, which allows UE 115-c to enter a lower operating power state, reducing power consumption at UE 115-c and reducing temperature at UE 115-c (e.g., reducing TL). skin and / or T jSuch power-saving technology enables the UE 115-c to reduce power consumption at both the UE 115-c modem baseband and the UE 115-c RF transceiver.

[0182] At 465, UE 115-c can communicate with base station 105-b according to the second configuration. At this point, UE 115-c can communicate with base station 105-b by receiving signals using a first subset of the receive ports indicated in the second configuration. Furthermore, UE 115-c can communicate with base station 105-b by transmitting SRS using a subset of transmit ports corresponding to the first subset of receive ports indicated in the second configuration. Therefore, compared to communication performed according to the first configuration, UE 115-c can communicate with base station 105-b at 465 using a smaller number of layers (e.g., a lower rank).

[0183] UE 115-c can communicate with base station 105-b at 465 based on the second configuration received at 450, selectively adjusting parameters associated with a second subset of the receive ports at 460, or both. For example, the second configuration may instruct UE 115-c to use a first subset of receive ports, including a first receive port and a third receive port. Subsequently, UE 115-c can deactivate the second and fourth receive ports to enter a second power state (e.g., a reduced power state). In this example, UE 115-c can communicate with base station 105-b according to the second configuration by receiving downlink transmissions from base station 105-b using the first and third receive ports. In this example, UE 115-c can be configured to use the first and third receive ports to decode two-layer downlink transmissions (e.g., two-layer PDSCH transmissions).

[0184] In some respects, UE 115-c may subsequently induce base station 105-b to increase the number of layers associated with the transmission scheduled at UE 115-c. For example, after communication at 465, UE 115-c may subsequently determine that it can return to a first power state higher than the second power state (e.g., the default power state, or another power state). UE 115-c may base its decision on determining that the thermal state of UE 115-c no longer satisfies a threshold thermal state (e.g., based on determining T...). skin <T thresh,skin and / or T j <T thresh,j Based on the determination that the power level (e.g., battery level) of UE 115-c no longer meets the threshold power level (e.g., based on the determination of P), UE >P thresh (or both) to determine the return to the first power state.

[0185] Continuing with the same example, when it is determined that UE 115-c is to operate in the first power state, UE 115-c can use an increased number of transmit ports corresponding to the increased number of receive ports to transmit SRS. For example, in the case where the second configuration includes two receive ports (e.g., 2Rx), UE 115-c can use four transmit ports corresponding to four receive ports to transmit SRS, so that base station 105-b increases the number of layers associated with the transmission scheduled at UE 115-c. Additionally or alternatively, UE 115-a can transmit a CSF report indicating a higher rank and / or a higher CQI, or both, compared to the rank and CQI indicated in the CSF report at 450, to further increase the number of layers associated with the transmission scheduled at UE 115-c by base station 105-b.

[0186] UE 115-c can implement the power-saving techniques described herein for a limited duration until such power-saving techniques are no longer needed. In other words, UE 115-c can implement the techniques described herein to reduce the power level at UE 115-c, thereby correspondingly reducing the power consumption and / or temperature of UE 115-c. Subsequently, when the temperature of UE 115-c (e.g., T...) skin T j Below the threshold temperature (e.g., T) thresh,skin ,T thresh,j ), and / or when the power level of UE 115-c (e.g., P UE The battery level rises to a threshold power level (e.g., P). thresh When the above conditions are met, UE 115-c may send an SRS and / or a CSF report in order to return to the first power state and / or the first configuration.

[0187] The techniques described herein enable UE 115-c to reduce its power state, thereby reducing power consumption and temperature. Specifically, the techniques described herein enable UE 115-c to perform SRS-AS, whereby UE 115-c avoids transmitting SRS and / or uses a subset of its transmit ports to transmit SRS, allowing base station 105-b to reduce the rank of scheduled transmissions. In this regard, by reducing the rank of scheduled transmissions at base station 105-b, UE 115-c can deactivate one or more receive ports, thereby enabling UE 115-c to enter a lower power state, reducing power consumption and temperature. This thermal mitigation and power-saving technique allows UE 115-c to reduce power consumption at its modem baseband and RF transceiver components.

[0188] Figure 5 A block diagram 500 illustrates a device 505 supporting techniques for thermal mitigation and power saving, according to aspects of this disclosure. Device 505 may be an example of an aspect of UE 115 as described herein. Device 505 may include a receiver 510, a transmitter 515, and a communication manager 520. Device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0189] Receiver 510 may provide units for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, and information channels related to techniques for thermal mitigation and power saving). Information may be transmitted to other components of device 505. Receiver 510 may use a single antenna or a collection of antennas.

[0190] Transmitter 515 may provide a unit for transmitting signals generated by other components of device 505. For example, transmitter 515 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, and information channels related to techniques for thermal mitigation and power saving). In some examples, transmitter 515 may be co-located with receiver 510 in a transceiver module. Transmitter 515 may use a single antenna or a collection of multiple antennas.

[0191] The communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or various components thereof, may be examples of units for performing various aspects of the techniques for thermal mitigation and power saving described herein. For example, the communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0192] In some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include any combination of the foregoing, such as a processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or a unit configured to or otherwise support the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0193] Additionally or alternatively, in some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented as code executed by a processor (e.g., as communication management software or firmware). If implemented as code executed by a processor, the functionality of the communication manager 520, receiver 510, transmitter 515, or various combinations thereof or components thereof may be performed by a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., units configured or otherwise supported for performing the functions described in this disclosure).

[0194] In some examples, the communication manager 520 can be configured to perform various operations (e.g., receiving, monitoring, transmitting) using the receiver 510, transmitter 515, or both, or otherwise cooperating with the receiver 510, transmitter 620, or both. For example, the communication manager 520 can receive information from the receiver 510, send information to the transmitter 515, or integrate with the receiver 510, transmitter 515, or both to receive information, send information, or perform various other operations described herein.

[0195] According to the examples disclosed herein, the communication manager 520 can support wireless communication at the UE. For example, the communication manager 520 can be configured or otherwise supported to receive a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The communication manager 520 can be configured or otherwise supported to transmit SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE, according to the first configuration. The communication manager 520 can be configured or otherwise supported to communicate with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS during a second time interval following the first time interval, based on the UE determining that it is operating in a second power state lower than the first power state. The communication manager 520 can be configured or otherwise supported to receive a second configuration from the base station based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports.

[0196] By including or configuring a communication manager 520 according to the examples described herein, device 505 (e.g., a processor that controls or otherwise couples to receiver 510, transmitter 515, communication manager 520, or a combination thereof) can support techniques for reducing the thermal state (e.g., temperature) and / or power consumption of UE 115. Specifically, the techniques described herein enable UE 115 to perform SRS-AS, wherein UE 115 avoids transmitting SRS and / or uses a subset of transmit ports to transmit SRS, thereby causing base station 105 to reduce the rank of scheduled transmissions. In this regard, by causing base station 105 to reduce the rank of scheduled transmissions, UE 115 can be able to deactivate one or more receive ports at UE 115-c, thereby enabling UE 115-c to enter a lower power state, reducing power consumption, and reducing the temperature at UE 115-c. By reducing the thermal state of UE 115, the efficiency and reliability of wireless communication at UE 115 can be improved.

[0197] Figure 6 A block diagram 600 illustrates a device 605 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure. Device 605 may be an example of an aspect of device 505 or UE 115 as described herein. Device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. Device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0198] Receiver 610 may provide units for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, and information channels related to techniques for thermal mitigation and power saving). Information may be transmitted to other components of device 605. Receiver 610 may use a single antenna or a collection of antennas.

[0199] Transmitter 615 may provide a unit for transmitting signals generated by other components of device 605. For example, transmitter 615 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, and information channels related to techniques for thermal mitigation and power saving). In some examples, transmitter 615 may be co-located with receiver 610 in a transceiver module. Transmitter 615 may use a single antenna or a collection of multiple antennas.

[0200] Device 605 or its various components may be examples of units representing various aspects of the techniques described herein for thermal mitigation and power saving. For example, communication manager 620 may include configuring receiver manager 625, SRS transmitter manager 630, base station communication manager 635, or any combination thereof. Communication manager 620 may be an example of aspects of communication manager 520 described herein. In some examples, communication manager 620 or its various components may be configured to: use receiver 610, transmitter 615, or both, or otherwise cooperate with receiver 610, transmitter 620, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or integrate with receiver 610, transmitter 615, or both to receive information, transmit information, or perform various other operations described herein.

[0201] According to the examples disclosed herein, the communication manager 620 can support wireless communication at the UE. The configuration receive manager 625 can be configured or otherwise supported to receive a first configuration from the base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The SRS transmit manager 630 can be configured or otherwise supported to transmit SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE, according to the first configuration. The base station communication manager 635 can be configured or otherwise supported to communicate with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS during a second time interval following the first time interval, based on the UE determining that it is operating in a second power state lower than the first power state. The configuration receive manager 625 can be configured or otherwise supported to receive a second configuration from the base station based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports.

[0202] Figure 7A block diagram 700 illustrates a communication management 720 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure. The communication manager 720 may be an example of aspects of the communication manager 520, communication manager 620, or both described herein. The communication manager 720 or its various components may be examples of units of various aspects of the techniques for thermal mitigation and power saving described herein. For example, the communication manager 720 may include a configuration receive manager 725, an SRS transmit manager 730, a base station communication manager 735, a power status manager 740, a CSF report transmit manager 745, a capability report manager 750, a receive port manager 755, a communication rank manager 760, a CQI manager 765, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0203] According to the examples disclosed herein, the communication manager 720 may support wireless communication at the UE. The configuration receive manager 725 may be configured or otherwise supported to receive a first configuration from the base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The SRS transmit manager 730 may be configured or otherwise supported to transmit SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE, according to the first configuration. The base station communication manager 735 may be configured or otherwise supported to communicate with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS during a second time interval following the first time interval, based on the UE determining that it is operating in a second power state lower than the first power state. In some examples, the configuration receive manager 725 may be configured or otherwise supported to receive a second configuration from the base station based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports.

[0204] In some examples, in order to support communication with the base station using fewer transmission ports than all transmission ports in the set of multiple transmission ports used for SRS, the SRS transmission manager 730 can be configured or otherwise support a unit for avoiding transmission of SRS on all transmission ports in the set of multiple transmission ports, wherein receiving a second configuration is based on the UE avoiding transmission of SRS on all transmission ports.

[0205] In some examples, in order to support communication with the base station using fewer transmission ports than all transmission ports in the set of multiple transmission ports used for SRS, the SRS transmission manager 730 can be configured or otherwise support a unit for transmitting SRS on a subset of transmission ports in the set of multiple transmission ports during a second time interval, wherein receiving the second configuration is based on transmitting SRS on the subset of transmission ports.

[0206] In some examples, the receive port manager 755 may be configured or otherwise supported as a unit for determining one or more parameters associated with the set of multiple receive ports. In some examples, the receive port manager 755 may be configured or otherwise supported as a unit for selecting a subset of transmit ports corresponding to a subset of receive ports from the set of multiple receive ports based on one or more parameters, wherein SRS transmission on the subset of transmit ports is selection-based. In some examples, the one or more parameters associated with the set of multiple receive ports include RSSI metric, RSRP metric, RSRQ metric, SNR ratio, SINR ratio, or any combination thereof.

[0207] In some examples, the set of multiple transmit ports includes four transmit ports. In other examples, the subset of transmit ports includes one or two transmit ports.

[0208] In some examples, the power state manager 740 may be configured or otherwise support elements for determining operation in a second power state based on a determination that the thermal state at the UE is greater than or equal to a threshold thermal state, wherein communication with the base station is made using fewer transmit ports than all transmit ports in a set of multiple transmit ports used for SRS based on the determination that the thermal state at the UE is greater than or equal to the threshold thermal state. In some examples, the thermal state includes the UE's skin temperature, the UE's junction temperature, or both.

[0209] In some examples, the power state manager 740 may be configured or otherwise support elements for determining operation in a second power state based on whether the power level at the UE meets a threshold power level, wherein communication with the base station is based on determining that the power level at the UE meets the threshold power level using fewer transmission ports than all transmission ports in a set of multiple transmission ports used for SRS. In some examples, the power level meets the threshold power level when the power level is less than or equal to the threshold power level. In some examples, the power level includes the UE's battery level.

[0210] In some examples, the CSF report sending manager 745 may be configured or otherwise supported to send a CSF report to the base station based on the UE's determination to operate in a second power state, wherein receiving the second configuration is based on sending the CSF report and communicating with the base station using fewer sending ports than all of the multiple sending ports in the set used for SRS.

[0211] In some examples, the communication rank manager 760 may be configured or otherwise supported to include a unit for determining the rank associated with communication with a base station using one or more of a set of multiple receive ports. In some examples, the communication rank manager 760 may be configured or otherwise supported to selectively adjust the determined rank to generate an adjusted rank smaller than the determined rank based on the UE's determination to operate in a second power state, wherein the CSF report includes an indication of the adjusted rank.

[0212] In some examples, the CQI manager 765 may be configured or otherwise supported for determining a cell of CQI associated with communication with the base station using one or more of a set of multiple receive ports. In some examples, the CQI manager 765 may be configured or otherwise supported for selectively adjusting the determined CQI to generate a cell of adjusted CQI smaller than the determined CQI based on the UE's determination to operate in a second power state, wherein the CSF report includes an indication of the adjusted CQI.

[0213] In some examples, the capability report manager 750 may be configured or otherwise supported for sending a capability report to the base station, including an indication of one or more transmit / receive modes supported by the UE, wherein receiving a first configuration is based on the transmit capability report. In some examples, the one or more transmit / receive modes include: a transmit / receive mode indicating one transmit port and four receive ports for the UE, a transmit / receive mode indicating two transmit ports and four receive ports for the UE, or both.

[0214] In some examples, the receive port manager 755 may be configured or otherwise support a unit for selectively adjusting one or more parameters associated with a second subset of a set of multiple receive ports based on a received second configuration. In some examples, one or more parameters are associated with an LNA for the second subset of receive ports, a phase shifter for the second subset of receive ports, or both.

[0215] Figure 8A diagram of a system 800 including device 805 supporting techniques for thermal mitigation and power saving, according to various aspects of this disclosure, is shown. Device 805 may be an example of or include components of device 505, device 605, or UE 115 described herein. Device 805 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, a memory 830, code 835, and a processor 840. These components may communicate electronically or be otherwise coupled (e.g., operative ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 845).

[0216] I / O controller 810 can manage the input and output signals of device 805. I / O controller 810 can also manage peripheral devices not integrated into device 805. In some cases, I / O controller 810 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 810 can use, for example... The operating system or other known operating system. Additionally or alternatively, the I / O controller 810 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 810 may be implemented as part of a processor (e.g., processor 840). In some cases, a user may interact with device 805 via the I / O controller 810 or via hardware components controlled by the I / O controller 810.

[0217] In some cases, device 805 may include a single antenna 825. However, in other cases, device 805 may have more than one antenna 825, which may be able to transmit or receive multiple wireless transmissions simultaneously. As described herein, transceiver 815 may communicate bidirectionally via one or more antennas 825, a wired or wireless link. For example, transceiver 815 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 815 may also include a modem for modulating packets and providing modulated packets to one or more antennas 825 for transmission, and for demodulating packets received from one or more antennas 825. Transceiver 815, or transceiver 815 and one or more antennas 825, may be an example of transmitter 515, transmitter 615, receiver 510, receiver 610, or any combination thereof or components thereof, as described herein.

[0218] Memory 830 may include random access memory (RAM) and read-only memory (ROM). Memory 830 may store computer-readable, computer-executable code 835, which includes instructions that, when executed by processor 840, cause device 805 to perform the various functions described herein. Code 835 may be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, code 835 may not be directly executable by processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, among others, memory 830 may contain a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0219] Processor 840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any combination thereof). In some cases, processor 840 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., functions or tasks supporting techniques for thermal mitigation and power saving). For example, device 805 or components of device 805 may include processor 840 and memory 830 coupled to processor 840, processor 840 and memory 830 being configured to perform the various functions described herein.

[0220] According to the examples disclosed herein, the communication manager 820 can support wireless communication at the UE. For example, the communication manager 820 can be configured or otherwise supported to receive a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The communication manager 820 can be configured or otherwise supported to transmit SRS on a set of multiple transmit ports corresponding to the set of multiple receive ports during a first time interval associated with a first power state of the UE, according to the first configuration. The communication manager 820 can be configured or otherwise supported to communicate with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS during a second time interval following the first time interval, based on the UE determining that it is operating in a second power state lower than the first power state. The communication manager 820 can be configured or otherwise supported to receive a second configuration from the base station based on communicating with the base station using fewer transmit ports than all of the multiple transmit ports in the set of multiple transmit ports used for SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple receive ports.

[0221] By including or configuring the communication manager 820 according to the examples described herein, device 805 can support techniques for reducing the thermal state (e.g., temperature) and / or power consumption of UE 115. Specifically, the techniques described herein enable UE 115 to perform SRS-AS, wherein UE 115 avoids transmitting SRS and / or uses a subset of transmit ports to transmit SRS, thereby causing base station 105 to reduce the rank of scheduled transmissions. In this regard, by causing base station 105 to reduce the rank of scheduled transmissions, UE 115 can be able to deactivate one or more receive ports at UE 115-c, thereby enabling UE 115-c to enter a lower power state, reducing power consumption and lowering the temperature at UE 115-c. By reducing the thermal state of UE 115, the efficiency and reliability of wireless communication at UE 115 can be improved, and the battery life of UE 115 can be increased.

[0222] In some examples, the communication manager 820 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using transceiver 815, one or more antennas 825, or any combination thereof, or otherwise cooperating with transceiver 915, one or more antennas 925, or any combination thereof. Although the communication manager 820 is shown as a separate component, in some examples, one or more functions described with reference to the communication manager 820 may be supported or performed by processor 840, memory 830, code 835, or any combination thereof. For example, code 835 may include instructions executable by processor 840 to cause device 805 to perform various aspects of thermal mitigation and power saving techniques as described herein, or processor 840 and memory 830 may be otherwise configured to perform or support such operations.

[0223] Figure 9 A flowchart illustrating a method 900 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. As described herein, the operation of method 900 can be implemented by a UE or its components. For example, the operation of method 900 can be provided by reference to... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE may execute a set of instructions to control the functional units of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described function.

[0224] At 905, the method may include: receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The operation of 905 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 905 may be found in the references. Figure 7 The configuration described is executed by receiver manager 725.

[0225] At 910, the method may include: transmitting SRS on a set of multiple transmit ports corresponding to a set of multiple receive ports during a first time interval associated with a first power state of the UE, according to a first configuration. The operation of 910 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 910 may be found in references. Figure 7 The SRS Send Manager 730 described is used to perform this.

[0226] At 915, the method may include: based on the UE determining that it is operating in a second power state lower than a first power state, communicating with the base station using fewer transmission ports than all transmission ports in the set of multiple transmission ports used for SRS during the second time interval following the first time interval. The operation of 915 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 915 may be found in references... Figure 7The base station communication manager 735 described is used to execute this.

[0227] At 920, the method may include: receiving a second configuration from the base station based on communicating with the base station using fewer transmission ports than all of the multiple transmission ports used for SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple reception ports from the set of reception ports. The operation of 920 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 920 may be found in the references. Figure 7 The configuration described is executed by receiver manager 725.

[0228] Figure 10 A flowchart illustrating a method 1000 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. As described herein, the operation of method 1000 can be implemented by a UE or its components. For example, the operation of method 1000 can be referenced... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE may execute a set of instructions to control the functional units of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described function.

[0229] At point 1005, the method may include: receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The operation at point 1005 can be performed according to the examples disclosed herein. In some examples, aspects of the operation at point 1005 may be found in references. Figure 7 The configuration described is executed by receiver manager 725.

[0230] At 1010, the method may include: transmitting SRS on a set of multiple transmit ports corresponding to a set of multiple receive ports during a first time interval associated with a first power state of the UE, according to a first configuration. The operation of 1010 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1010 may be found in references. Figure 7 The SRS Send Manager 730 described is used to perform this.

[0231] At point 1015, the method may include: avoiding sending SRS on all transmit ports in the set of multiple transmit ports. The operation at point 1015 can be performed according to the examples disclosed herein. In some examples, aspects of the operation at point 1015 may be found in the references. Figure 7 The SRS Send Manager 730 described is used to perform this.

[0232] At 1020, the method may include: receiving a second configuration from the base station based on avoiding transmitting SRS on all transmit ports in the set of multiple transmit ports, the second configuration instructing the UE to communicate with the base station using a first subset of receive ports in the set of multiple receive ports. The operation of 1020 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1020 may be found in references. Figure 7 The configuration described is executed by receiver manager 725.

[0233] Figure 11 A flowchart illustrating a method 1100 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. As described herein, operation of method 1100 can be implemented by a UE or its components. For example, operation of method 1100 can be provided by reference to... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE may execute a set of instructions to control the functional units of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described function.

[0234] At 1105, the method may include: receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The operation of 1105 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1105 may be found in references. Figure 7 The configuration described is executed by receiver manager 725.

[0235] At 1110, the method may include: transmitting SRS on a set of multiple transmit ports corresponding to a set of multiple receive ports during a first time interval associated with a first power state of the UE, according to a first configuration. The operation of 1110 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1110 may be found in references. Figure 7 The SRS Send Manager 730 described is used to perform this.

[0236] At 1115, the method may include: transmitting SRS on a subset of the set of transmission ports during a second time interval. The operation of 1115 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1115 may be found in the references. Figure 7 The SRS Send Manager 730 described is used to perform this.

[0237] At 1120, the method may include: receiving a second configuration from the base station based on transmitting SRS on a subset of the transmitting ports, the second configuration instructing the UE to communicate with the base station using a first subset of a set of multiple receiving ports. The operation of 1120 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1120 may be found in the references. Figure 7 The configuration described is executed by receiver manager 725.

[0238] Figure 12 A flowchart illustrating a method 1200 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. As described herein, the operation of method 1200 can be implemented by a UE or its components. For example, the operation of method 1200 can be described by reference to... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE may execute a set of instructions to control the functional units of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described function.

[0239] At 1205, the method may include: receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The operation of 1205 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1205 may be found in references. Figure 7 The configuration described is executed by receiver manager 725.

[0240] At 1210, the method may include: transmitting SRS on a set of multiple transmit ports corresponding to a set of multiple receive ports during a first time interval associated with a first power state of the UE, according to a first configuration. The operation of 1210 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1210 may be found in references. Figure 7 The SRS Send Manager 730 described is used to perform this.

[0241] At 1215, the method may include: determining operation in a second power state based on determining that the thermal state at the UE is greater than or equal to a threshold thermal state. The operation at 1215 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation at 1215 may be found in references. Figure 7 The power state manager 740 is described and executed accordingly.

[0242] At 1220, the method may include: based on the UE determining that it is operating in a second power state lower than a first power state, communicating with a base station during a second time interval following a first time interval using fewer transmission ports than all transmission ports in the set of multiple transmission ports used for SRS, wherein communicating with the base station using fewer transmission ports than all transmission ports in the set of multiple transmission ports used for SRS is based on determining that the thermal state at the UE is greater than or equal to a threshold thermal state. The operation of 1220 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1220 may be derived from references... Figure 7 The base station communication manager 735 described is used to execute this.

[0243] At 1225, the method may include: receiving a second configuration from the base station based on communicating with the base station using fewer transmission ports than all of the multiple transmission ports used for SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple reception ports from the set of reception ports. The operation of 1225 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1225 may be found in the references. Figure 7 The configuration described is executed by receiver manager 725.

[0244] Figure 13 A flowchart illustrating a method 1300 supporting techniques for thermal mitigation and power saving according to aspects of this disclosure is shown. As described herein, operation of method 1300 can be implemented by a UE or its components. For example, operation of method 1300 can be provided by reference to... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE may execute a set of instructions to control the functional units of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described function.

[0245] At 1305, the method may include: receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a set of multiple receive ports of the UE. The operation of 1305 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1305 may be found in references. Figure 7 The configuration described is executed by receiver manager 725.

[0246] At 1310, the method may include: transmitting SRS on a set of multiple transmit ports corresponding to a set of multiple receive ports during a first time interval associated with a first power state of the UE, according to a first configuration. The operation of 1310 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1310 may be found in references. Figure 7 The SRS Send Manager 730 described is used to perform this.

[0247] At 1315, the method may include: determining operation in a second power state based on determining that the power level at the UE meets a threshold power level. The operation at 1315 can be performed according to the examples disclosed herein. In some examples, aspects of the operation at 1315 may be found in references. Figure 7 The power state manager 740 is described and executed accordingly.

[0248] At 1320, the method may include: based on the UE determining that it is operating in a second power state lower than a first power state, communicating with a base station during a second time interval following a first time interval using fewer transmission ports than all transmission ports in the set of multiple transmission ports used for SRS, wherein communicating with the base station using fewer transmission ports than all transmission ports in the set of multiple transmission ports used for SRS is based on determining that the power level at the UE meets a threshold power level. The operation of 1320 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1320 may be derived from references... Figure 7 The base station communication manager 735 described is used to execute this.

[0249] At 1325, the method may include: receiving a second configuration from the base station based on communicating with the base station using fewer transmission ports than all of the multiple transmission ports used for SRS, the second configuration instructing the UE to communicate with the base station using a first subset of the multiple reception ports from the set of reception ports. The operation of 1325 can be performed according to the examples disclosed herein. In some examples, some aspects of the operation of 1325 may be found in the references. Figure 7 The configuration described is executed by receiver manager 725.

[0250] The following provides an overview of aspects of this disclosure:

[0251] Aspect 1: A method for wireless communication at a UE, comprising: receiving a first configuration from a base station, the first configuration instructing the UE to communicate with the base station using a plurality of receive ports of the UE; transmitting SRS on a plurality of transmit ports corresponding to the plurality of receive ports during a first time interval associated with a first power state of the UE, according to the first configuration; communicating with the base station using fewer transmit ports than all of the plurality of transmit ports used for the SRS during a second time interval following the first time interval, based at least in part on the UE determining that it is operating in a second power state lower than the first power state; and receiving a second configuration from the base station, the second configuration instructing the UE to communicate with the base station using a first subset of the plurality of receive ports, based at least in part on the use of fewer transmit ports than all of the plurality of transmit ports used for the SRS.

[0252] Aspect 2: According to the method of aspect 1, communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the SRS includes: avoiding transmitting SRS on all of the plurality of transmission ports, wherein receiving the second configuration is at least in part based on the UE avoiding transmitting SRS on all of the transmission ports.

[0253] Aspect 3: The method according to any one of Aspects 1 to 2, wherein communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the SRS comprises: transmitting the SRS on a subset of the plurality of transmission ports during the second time interval, wherein receiving the second configuration is at least partially based on transmitting the SRS on the subset of transmission ports.

[0254] Aspect 4: The method according to aspect 3 further includes: determining one or more parameters associated with the plurality of receiving ports; and selecting, at least in part based on the one or more parameters, the subset of transmitting ports of the plurality of transmitting ports corresponding to a subset of receiving ports of the plurality of receiving ports, wherein transmitting the SRS on the subset of transmitting ports is at least in part based on the selection.

[0255] Aspect 5: According to the method of aspect 4, wherein the one or more parameters associated with the plurality of receiving ports include RSSI metric, RSRP metric, RSRQ metric, SNR, SINR, or any combination thereof.

[0256] Aspect 6: The method according to any of Aspects 3 to 5, wherein the plurality of transmitting ports includes four transmitting ports, and the subset of transmitting ports includes one or two transmitting ports.

[0257] Aspect 7: The method according to any one of Aspects 1 to 6 further includes: determining operation in the second power state based at least in part on determining that the thermal state at the UE is greater than or equal to a threshold thermal state, wherein communicating with the base station using fewer transmission ports than all of the plurality of transmission ports for the SRS is based at least in part on determining that the thermal state at the UE is greater than or equal to a threshold thermal state.

[0258] Aspect 8: According to the method of aspect 7, the thermal state includes the skin temperature of the UE, the junction temperature of the UE, or both.

[0259] Aspect 9: The method according to any one of Aspects 1 to 8 further includes: determining operation in the second power state based at least in part on determining that the power level at the UE meets a threshold power level, wherein communicating with the base station using fewer transmission ports than all of the plurality of transmission ports for the SRS is based at least in part on determining that the power level at the UE meets the threshold power level.

[0260] Aspect 10: According to the method of aspect 9, wherein the power level satisfies the threshold power level when the power level is less than or equal to the threshold power level.

[0261] Aspect 11: The method according to any one of Aspects 9 to 10, wherein the power level includes the battery level of the UE.

[0262] Aspect 12: The method according to any one of Aspects 1 to 11 further includes: sending a channel state feedback report to the base station at least in part based on the UE determining that it is operating in the second power state, wherein receiving the second configuration is at least in part based on sending the channel state feedback report and communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the SRS.

[0263] Aspect 13: The method according to aspect 12 further includes: determining a rank associated with communication using one or more of the plurality of receiving ports and the base station; selectively adjusting the determined rank to generate an adjusted rank smaller than the determined rank, based at least in part on the UE determining that it is operating in the second power state, wherein the channel state feedback report includes an indication of the adjusted rank.

[0264] Aspect 14: The method according to any one of Aspects 12 to 13 further includes: determining a CQI associated with communication using one or more of the plurality of receiving ports and the base station; selectively adjusting the determined CQI to generate an adjusted CQI smaller than the determined CQI, at least in part based on the UE determining that it is operating in the second power state, wherein the channel state feedback report includes an indication of the adjusted CQI.

[0265] Aspect 15: The method according to any one of aspects 1 to 14 further includes: sending a capability report to the base station including an indication of one or more transmit / receive modes supported by the UE, wherein receiving the first configuration is at least partially based on sending the capability report.

[0266] Aspect 16: According to the method of aspect 15, wherein the one or more transmit / receive modes include: a transmit / receive mode indicating one transmit port and four receive ports for the UE, a transmit / receive mode indicating two transmit ports and four receive ports for the UE, or both.

[0267] Aspect 17: The method according to any one of aspects 1 to 16 further includes: selectively adjusting one or more parameters associated with a second subset of the plurality of receiving ports, at least in part based on receiving the second configuration.

[0268] Aspect 18: The method according to aspect 17, wherein the one or more parameters are associated with an LNA for the second subset of receiving ports, a phase shifter for the second subset of receiving ports, or both.

[0269] Aspect 19: An apparatus for wireless communication at a UE, comprising a processor, a memory coupled to the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to perform the methods of any of Aspects 1 to 18.

[0270] Aspect 20: An apparatus for wireless communication at a UE, comprising at least one unit for performing the method described in any of aspects 1 to 18.

[0271] Aspect 21: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to perform the methods described in any of aspects 1 to 18.

[0272] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more of these methods can be combined.

[0273] While some aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can be applied beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0274] The information and signals described herein can be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout this specification can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0275] Using a general-purpose processor, DSP, ASIC, CPU, FPGA, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any combination thereof designed to perform the functions described herein, the various illustrative blocks and components described in connection with the disclosure herein may be implemented or executed. The general-purpose processor may be a microprocessor; however, alternatively, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such architecture).

[0276] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented by software executed by a processor, these functions can be stored as one or more instructions or code on or transmitted over a computer-readable medium. Other examples and implementations are within the scope of this application and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions can also be physically placed in various locations, including portions distributed such that functions are implemented at different physical locations.

[0277] Computer-readable media includes both non-transitory computer storage media and communication media, wherein the communication media includes any medium that facilitates the transfer of a computer program from one location to another. Non-transitory storage media can be any available medium accessible by a general-purpose computer or a special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, disc-on-CD ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Furthermore, any connection can be appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used herein, disk and disc include CDs, laser discs, optical discs, digital versatile optical discs (DVDs), floppy disks, and Blu-ray discs, where disks typically copy data magnetically, while optical discs use lasers to copy data optically. The above combinations should also be included within the scope of computer-readable media.

[0278] As used herein, the word "or" as used in the claims, as in the list of entries (e.g., a list of entries preceded by phrases such as "at least one of" or "one or more of"), indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A, or B, or C, or AB, or AC, or BC, or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" will be interpreted in the same manner as the phrase "at least partially based on".

[0279] In the accompanying drawings, similar components or features may have the same reference numerals. Additionally, components of the same type may be distinguished by a dash followed by a second reference numeral to differentiate between similar components. If only the first reference numeral is used in this specification, the description applies to any similar component having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0280] The specification described herein, in conjunction with the accompanying drawings, describes exemplary configurations and does not represent all examples that can be implemented or that fall within the scope of the claims. Throughout this specification, the term "example" means "serving as an example, instance, or illustration," and not "preferred" or "advantageous" relative to other examples. Specific details are included to provide an understanding of the described techniques. However, these techniques can be implemented without using these specific details. In some cases, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0281] The description herein is provided to enable those skilled in the art to implement or use the disclosed content. Various modifications to this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but is consistent with the broadest scope of the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: The UE receives a first configuration from the base station, the first configuration instructing the UE to communicate with the base station using multiple receive ports of the UE; According to the first configuration, during a first time interval associated with a first power state of the UE, a probe reference signal is transmitted on a plurality of transmit ports corresponding to the plurality of receive ports; Based at least in part on the UE determining to operate in a second power state lower than the first power state, and communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal during a second time interval following the first time interval; as well as The UE communicates with the base station using at least a fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal, and receives a second configuration from the base station, the second configuration instructing the UE to communicate with the base station using a first subset of the plurality of reception ports.

2. The method according to claim 1, wherein, Communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal includes: Avoid transmitting probe reference signals on all of the plurality of transmit ports, wherein receiving the second configuration is at least in part based on the UE avoiding transmitting probe reference signals on all of the transmit ports.

3. The method according to claim 1, wherein, Communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal includes: During the second time interval, a probe reference signal is transmitted on a subset of the plurality of transmit ports, wherein receiving the second configuration is at least in part based on transmitting the probe reference signal on the subset of transmit ports.

4. The method according to claim 3, further comprising: Determine one or more parameters associated with the plurality of receiving ports; as well as The subset of transmitting ports corresponding to a subset of receiving ports from the plurality of transmitting ports is selected at least in part based on one or more of the parameters, wherein transmitting the probe reference signal on the subset of transmitting ports is at least in part based on the selection.

5. The method according to claim 4, wherein, The one or more parameters associated with the plurality of receiving ports include a received signal strength indicator metric, a reference signal received power metric, a reference signal received quality metric, a signal-to-noise ratio, a signal-to-interference plus-noise ratio, or any combination thereof.

6. The method according to claim 3, wherein, The plurality of transmitting ports includes four transmitting ports, and the subset of transmitting ports includes one or two transmitting ports.

7. The method according to claim 1, further comprising: Operating in the second power state is determined at least in part based on determining that the thermal state at the UE is greater than or equal to a threshold thermal state, wherein communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal is at least in part based on determining that the thermal state at the UE is greater than or equal to the threshold thermal state.

8. The method according to claim 7, wherein, The thermal state includes the skin temperature of the UE, the junction temperature of the UE, or both.

9. The method according to claim 1, further comprising: Operating in the second power state is determined at least in part based on determining that the power level at the UE meets a threshold power level, wherein communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal is at least in part based on determining that the power level at the UE meets the threshold power level.

10. The method according to claim 9, wherein, The power level satisfies the threshold power level when the power level is less than or equal to the threshold power level.

11. The method according to claim 9, wherein, The power level includes the battery level of the UE.

12. The method according to claim 1, further comprising: The UE determines to operate in the second power state to send a channel state feedback report to the base station, at least in part based on the UE's determination to operate in the second power state, wherein receiving the second configuration is at least in part based on sending the channel state feedback report and communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal.

13. The method of claim 12, further comprising: Determine the rank associated with communication using one or more of the plurality of receiving ports and the base station; Based at least in part on the UE determining that it is operating in the second power state, the determined rank is selectively adjusted to generate an adjusted rank smaller than the determined rank, wherein the channel state feedback report includes an indication of the adjusted rank.

14. The method of claim 12, further comprising: Determine a channel quality indicator associated with communication using one or more of the plurality of receive ports and the base station; Based at least in part on the UE determining that it is operating in the second power state, the determined channel quality indicator is selectively adjusted to generate an adjusted channel quality indicator that is smaller than the determined channel quality indicator, wherein the channel state feedback report includes an indication of the adjusted channel quality indicator.

15. The method according to claim 1, further comprising: A capability report is sent to the base station, including an indication of one or more transmit / receive modes supported by the UE, wherein receiving the first configuration is at least in part based on sending the capability report.

16. The method according to claim 15, wherein, The one or more transmit / receive modes include: a transmit / receive mode indicating one transmit port and four receive ports for the UE, a transmit / receive mode indicating two transmit ports and four receive ports for the UE, or both.

17. The method according to claim 1, further comprising: One or more parameters associated with a second subset of the plurality of receive ports are selectively adjusted, at least in part, based on the received second configuration.

18. The method according to claim 17, wherein, The one or more parameters are associated with a low-noise amplifier for the second subset of receiver ports, a phase shifter for the second subset of receiver ports, or both.

19. An apparatus for wireless communication at a user equipment (UE), comprising: processor; A memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: The UE receives a first configuration from the base station, the first configuration instructing the UE to communicate with the base station using multiple receive ports of the UE; According to the first configuration, during a first time interval associated with a first power state of the UE, a probe reference signal is transmitted on a plurality of transmit ports corresponding to the plurality of receive ports; Based at least in part on the UE determining to operate in a second power state lower than the first power state, and communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal during a second time interval following the first time interval; as well as The UE communicates with the base station using at least a fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal, and receives a second configuration from the base station, the second configuration instructing the UE to communicate with the base station using a first subset of the plurality of reception ports.

20. The apparatus according to claim 19, wherein, The instruction for communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal can be executed by the processor to enable the device to: Avoid transmitting probe reference signals on all of the plurality of transmit ports, wherein receiving the second configuration is at least in part based on the UE avoiding transmitting probe reference signals on all of the transmit ports.

21. The apparatus according to claim 19, wherein, The instruction for communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal can be executed by the processor to enable the device to: During the second time interval, a probe reference signal is transmitted on a subset of the plurality of transmit ports, wherein receiving the second configuration is at least in part based on transmitting the probe reference signal on the subset of transmit ports.

22. The apparatus according to claim 21, wherein, The instructions can also be executed by the processor to make the device: Determine one or more parameters associated with the plurality of receive ports; and The subset of transmitting ports corresponding to a subset of receiving ports from the plurality of transmitting ports is selected at least in part based on one or more of the parameters, wherein transmitting the probe reference signal on the subset of transmitting ports is at least in part based on the selection.

23. The apparatus according to claim 22, wherein, The one or more parameters associated with the plurality of receiving ports include a received signal strength indicator metric, a reference signal received power metric, a reference signal received quality metric, a signal-to-noise ratio, a signal-to-interference plus-noise ratio, or any combination thereof.

24. The apparatus according to claim 21, wherein, The plurality of transmitting ports includes four transmitting ports, and the subset of transmitting ports includes one or two transmitting ports.

25. The apparatus according to claim 19, wherein, The instructions can also be executed by the processor to make the device: Operating in the second power state is determined at least in part based on determining that the thermal state at the UE is greater than or equal to a threshold thermal state, wherein communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal is at least in part based on determining that the thermal state at the UE is greater than or equal to the threshold thermal state.

26. The apparatus according to claim 19, wherein, The instructions can also be executed by the processor to make the device: Operating in the second power state is determined at least in part based on determining that the power level at the UE meets a threshold power level, wherein communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal is at least in part based on determining that the power level at the UE meets the threshold power level.

27. The apparatus according to claim 19, wherein, The instructions can also be executed by the processor to make the device: The UE determines to operate in the second power state to send a channel state feedback report to the base station, at least in part based on the UE's determination to operate in the second power state, wherein receiving the second configuration is at least in part based on sending the channel state feedback report and communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal.

28. The apparatus according to claim 19, wherein, The instructions can also be executed by the processor to make the device: A capability report is sent to the base station, including an indication of one or more transmit / receive modes supported by the UE, wherein receiving the first configuration is at least in part based on sending the capability report.

29. An apparatus for wireless communication at a user equipment (UE), comprising: A unit for receiving a first configuration from a base station, the first configuration indicating that the UE will communicate with the base station using multiple receiving ports of the UE; A unit for transmitting a probe reference signal on a plurality of transmit ports corresponding to the plurality of receive ports during a first time interval associated with a first power state of the UE, according to the first configuration; A unit for communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal during a second time interval after the first time interval, based at least in part on the UE determining that it is operating in a second power state lower than the first power state; as well as A unit for receiving a second configuration from the base station, which is used at least in part to communicate with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal, the second configuration instructing the UE to communicate with the base station using a first subset of the plurality of reception ports.

30. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code including instructions executable by a processor for the following operations: The UE receives a first configuration from the base station, the first configuration instructing the UE to communicate with the base station using multiple receive ports of the UE; According to the first configuration, during a first time interval associated with a first power state of the UE, a probe reference signal is transmitted on a plurality of transmit ports corresponding to the plurality of receive ports; Based at least in part on the UE determining to operate in a second power state lower than the first power state, and communicating with the base station using fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal during a second time interval following the first time interval; as well as The UE communicates with the base station using at least a fewer transmission ports than all of the plurality of transmission ports used for the probe reference signal, and receives a second configuration from the base station, the second configuration instructing the UE to communicate with the base station using a first subset of the plurality of reception ports.

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