WO2025255380A1 - Techniques for increasing communication efficiency using memory retention - Google Patents

Abstract

Certain aspects of the present disclosure are directed towards techniques and apparatus for wireless communication. An example method generally includes: storing one or more communication settings for signal communication in memory; performing a first signal communication using the one or more communication settings; entering an idle mode of operation after performing the signal communication; retaining the one or more communication settings in the memory during the idle mode; and performing a second signal communication after the idle mode using the one or more communication settings retained in the memory.

Description

TECHNIQUES FOR INCREASING COMMUNICATION EFFICIENCY USING MEMORY RETENTION

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims benefit of and priority to India Provisional Application No. 202421043933 filed June 6, 2024, which is hereby expressly incorporated by reference herein in its entirety as if fully set forth below and for all applicable purposes.

TECHNICAL FIELD

[0002] Certain aspects of the present disclosure generally relate to wireless communication and, more particularly, to techniques for wireless communication using memory retention.

BACKGROUND

[0003] Wireless communication devices are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on. Such wireless communication devices may transmit and/or receive radio frequency (RF) signals via any of various suitable radio access technologies (RATs) including, but not limited to, Fifth Generation (5G) New Radio (NR), Long Term Evolution (LTE), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Wideband CDMA (WCDMA), Global System for Mobility (GSM), Bluetooth, Bluetooth Low Energy (BLE), ZigBee, wireless local area network (WLAN) RATs (e.g., WiFi), and the like.

[0004] A wireless communication network may include a number of base stations that can support communication for a number of mobile stations. A mobile station (MS) may communicate with a base station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the base station to the mobile station, and the uplink (or reverse link) refers to the communication link from the mobile station to the base station. A base station may transmit data and control information on the downlink to a mobile station and/or may receive data and control information on the uplink from the mobile station. The base station and/or mobile station may include a radio implemented with a transceiver that may be used for communication using one or more communication settings.

SUMMARY

[0005] The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of this disclosure as expressed by the claims which follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled “Detailed Description,” one will understand how the features of this disclosure provide advantages that include reduced power consumption.

[0006] Certain aspects of the present disclosure are directed towards a method for wireless communication. The method generally includes: storing one or more communication settings for signal communication in memory; performing a first signal communication using the one or more communication settings; entering an idle mode of operation after performing the signal communication; retaining the one or more communication settings in the memory during the idle mode; and performing a second signal communication after the idle mode using the one or more communication settings retained in the memory.

[0007] Certain aspects of the present disclosure are directed towards an apparatus for wireless communication. The apparatus generally includes: a controller; a regulator having a control input coupled to the controller; memory having a voltage supply input coupled to an output of the regulator, wherein the controller is configured to control the regulator to retain one or more communication settings in the memory during an idle mode of the apparatus; and a transceiver coupled to the memory.

[0008] Certain aspects of the present disclosure are directed towards an apparatus for wireless communication. The apparatus generally includes: memory configured to store one or more communication settings; a transceiver configured to perform a first signal communication using the one or more communication settings, wherein the apparatus is configured to enter an idle mode after the first signal communication; and a controller configured to cause the memory to retain the one or more communication settings during the idle mode, wherein the transceiver is further configured to perform a second signal communication after the idle mode using the one or more communication settings retained in the memory.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] So that the manner in which the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects.

[0010] FIG. l is a diagram of an example wireless communications network, in which aspects of the present disclosure may be practiced.

[0011] FIG. 2 is a block diagram conceptually illustrating a design of an example base station (BS) and user equipment (UE), in which aspects of the present disclosure may be practiced.

[0012] FIG. 3 is a block diagram of an example radio frequency (RF) transceiver, in which aspects of the present disclosure may be practiced.

[0013] FIG. 4 illustrates a downlink pipe (DLP) including a primary receive path (PRx) and a diversity receive path (DRx).

[0014] FIG. 5 is a block diagram of a wireless device implemented with memory retention, in accordance with certain aspects of the present disclosure.

[0015] FIG. 6 is a timing diagram illustrating timing of memory loading and signal reception using one or more subscribers without memory retention.

[0016] FIG. 7 is a timing diagram illustrating example signals during different operating phases of a wireless device using memory retention, in accordance with certain aspects of the present disclosure.

[0017] FIG. 8 is a state diagram showing different states of a finite state machine (FSM), in accordance with certain aspects of the present disclosure. [0018] FIG. 9 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.

[0019] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation.

DETAILED DESCRIPTION

[0020] Certain aspects of the present disclosure are directed toward techniques that facilitate exiting idle mode for a wireless device more quickly using memory retention. For example, communication settings may be stored in memory for communication via a transceiver. Typically, once the wireless device enters idle mode, the communication settings in the memory may be lost. Thus, the communication settings may have to be reloaded in the memory after exiting idle mode (e.g., when both subscribers associated with the wireless device have been idle in multi -sub scriber identity module (MSIM) implementations), causing delays in communications or increased power consumption to implement a fast interface to load the communication settings more quickly. In some aspects of the present disclosure, when the wireless device is configured in idle mode, the memory may be placed in a memory retention mode so that previously stored communication settings are retained in the memory. Thus, upon exiting the idle mode, the previously stored and retained communication settings may be used, allowing for communications to be performed more quickly and saving power that would otherwise be used to implement a faster interface to reload the communication settings in the memory.

[0021] Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0022] The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects.

[0023] As used herein, the term “connected with” in the various tenses of the verb “connect” may mean that element A is directly connected to element B or that other elements may be connected between elements A and B (i.e., that element A is indirectly connected with element ). In the case of electrical components, the term “connected with” may also be used herein to mean that a wire, trace, or other electrically conductive material is used to electrically connect elements^ and B (and any components electrically connected therebetween).

An Example Wireless System

[0024] FIG. 1 illustrates an example wireless communications network 100, in which aspects of the present disclosure may be practiced. For example, the wireless communications network 100 may be a New Radio (NR) system (e.g., a Fifth Generation (5G) NR network), an Evolved Universal Terrestrial Radio Access (E-UTRA) system (e.g., a Fourth Generation (4G) network), a Universal Mobile Telecommunications System (UMTS) (e.g., a Second Generation/Third Generation (2G/3G) network), or a code division multiple access (CDMA) system (e.g., a 2G/3G network), or may be configured for communications according to an IEEE standard such as one or more of the 802.11 standards, etc.

[0025] As illustrated in FIG. 1, the wireless communications network 100 may include a number of base stations (BSs) 1 lOa-z (each also individually referred to herein as “BS 110” or collectively as “BSs 110”) and other network entities. A BS may also be referred to as an access point (AP), an evolved Node B (eNodeB or eNB), a next generation Node B (gNodeB or gNB), or some other terminology.

[0026] A BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell,” which may be stationary or may move according to the location of a mobile BS. In some examples, the BSs 110 may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in wireless communications network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network. In the example shown in FIG. 1, the BSs 110a, 110b, and 110c may be macro BSs for the macro cells 102a, 102b, and 102c, respectively. The BS 1 lOx may be a pico BS for a pico cell 102x. The BSs 1 lOy and 1 lOz may be femto BSs for the femto cells 102y and 102z, respectively. A BS may support one or multiple cells.

[0027] The BSs 110 communicate with one or more user equipment’s (UEs) 120a-y (each also individually referred to herein as “UE 120” or collectively as “UEs 120”) in the wireless communications network 100. A UE may be fixed or mobile and may also be referred to as a user terminal (UT), a mobile station (MS), an access terminal, a station (STA), a client, a wireless device, a mobile device, or some other terminology. A user terminal may be a wireless device, such as a cellular phone, a smartphone, a personal digital assistant (PDA), a handheld device, awearable device, a wireless modem, a laptop computer, a tablet, a personal computer, etc.

[0028] The BSs 110 are considered transmitting entities for the downlink and receiving entities for the uplink. The UEs 120 are considered transmitting entities for the uplink and receiving entities for the downlink. As used herein, a “transmitting entity” is an independently operated apparatus or device capable of transmitting data via a frequency channel, and a “receiving entity” is an independently operated apparatus or device capable of receiving data via a frequency channel. In the following description, the subscript “d ” denotes the downlink, the subscript “np” denotes the uplink. N_up UEs may be selected for simultaneous transmission on the uplink, Ndn UEs may be selected for simultaneous transmission on the downlink. N_up may or may not be equal to Ndn, and N_up and Ndn may be static values or can change for each scheduling interval. Beam- steering or some other spatial processing technique may be used at the BSs 110 and/or UEs 120.

[0029] The UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communications network 100, and each UE 120 may be stationary or mobile. The wireless communications network 100 may also include relay stations (e.g., relay station 1 lOr), also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and send a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110), or that relays transmissions between UEs 120, to facilitate communication between devices.

[0030] The BSs 110 may communicate with one or more UEs 120 at any given moment on the downlink and uplink. The downlink (i.e., forward link) is the communication link from the BSs 110 to the UEs 120, and the uplink (i.e., reverse link) is the communication link from the UEs 120 to the BSs 110. A UE 120 may also communicate peer-to-peer with another UE 120.

[0031] The wireless communications network 100 may use multiple transmit and multiple receive antennas for data transmission on the downlink and uplink. BSs 110 may be equipped with a number Nap of antennas to achieve transmit diversity for downlink transmissions and/or receive diversity for uplink transmissions. A set N_u of UEs 120 may receive downlink transmissions and transmit uplink transmissions. Each UE 120 may transmit user-specific data to and/or receive user-specific data from the BSs 110. In general, each UE 120 may be equipped with one or multiple antennas. The N_u UEs 120 can have the same or different numbers of antennas.

[0032] The wireless communications network 100 may be a time division duplex (TDD) system or a frequency division duplex (FDD) system. For a TDD system, the downlink and uplink share the same frequency band. For an FDD system, the downlink and uplink use different frequency bands. The wireless communications network 100 may also utilize a single carrier or multiple carriers for transmission. Each UE 120 may be equipped with a single antenna (e.g., to keep costs down) or multiple antennas (e.g., where the additional cost can be supported). [0033] A network controller 130 (also sometimes referred to as a “system controller”) may be in communication with a set of BSs 110 and provide coordination and control for these BSs 110 (e.g., via a backhaul). In certain cases (e.g., in a 5G NR system), the network controller 130 may include a centralized unit (CU) and/or a distributed unit (DU). In certain aspects, the network controller 130 may be in communication with a core network 132 (e.g., a 5G Core Network (5GC)), which provides various network functions such as Access and Mobility Management, Session Management, User Plane Function, Policy Control Function, Authentication Server Function, Unified Data Management, Application Function, Network Exposure Function, Network Repository Function, Network Slice Selection Function, etc.

[0034] In certain aspects of the present disclosure, the BSs 110 and/or the UEs 120 may include a radio implemented with memory retention, as described in more detail herein.

[0035] FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., from the wireless communications network 100 of FIG. 1), in which aspects of the present disclosure may be implemented.

[0036] On the downlink, at the BS 110a, a transmit processor 220 may receive data from a data source 212, control information from a controller/processor 240, and/or possibly other data (e.g., from a scheduler 244). The various types of data may be sent on different transport channels. For example, the control information may be designated for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid automatic repeat request (HARQ) indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. The data may be designated for the physical downlink shared channel (PDSCH), etc. A medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes. The MAC-CE may be carried in a shared channel such as a PDSCH, a physical uplink shared channel (PUSCH), or a physical sidelink shared channel (PSSCH).

[0037] The processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS).

[0038] A transmit (TX) multiple-input, multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 232a-232t. Each modulator in transceivers 232a- 232t may process a respective output symbol stream (e.g., for orthogonal frequency division multiplexing (OFDM), etc.) to obtain an output sample stream. Each of the transceivers 232a-232t may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from the transceivers 232a-232t may be transmitted via the antennas 234a-234t, respectively.

[0039] At the UE 120a, the antennas 252a-252r may receive the downlink signals from the BS 110a and may provide received signals to the transceivers 254a-254r, respectively. The transceivers 254a-254r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator (DEMOD) in the transceivers 232a-232t may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all the demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller/processor 280.

[0040] On the uplink, at UE 120a, a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH)) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH)) from the controller/processor 280. The transmit processor 264 may also generate reference symbols for a reference signal (e.g., the sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators (MODs) in transceivers 254a-254r (e.g., for single-carrier frequency division multiplexing (SC-FDM), etc.), and transmitted to the BS 110a. At the BS 110a, the uplink signals from the UE 120a may be received by the antennas 234, processed by the demodulators in transceivers 232a-232t, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120a. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.

[0041] The memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively. The memories 242 and 282 may also interface with the controllers/processors 240 and 280, respectively. A scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.

[0042] In certain aspects of the present disclosure, the transceivers 232 and/or the transceivers 254 may be implemented as part of a radio with memory retention, as described in more detail herein.

[0043] NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. NR may support half-duplex operation using time division duplexing (TDD). OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth. The system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple resource blocks (RBs).

Example RF Transceiver

[0044] FIG. 3 is a block diagram of an example radio frequency (RF) transceiver circuit 300, in accordance with certain aspects of the present disclosure. The RF transceiver circuit 300 includes at least one transmit (TX) path 302 (also known as a “transmit chain”) for transmitting signals via one or more antennas 306 and at least one receive (RX) path 304 (also known as a “receive chain”) for receiving signals via the antennas 306. When the TX path 302 and the RX path 304 share an antenna 306, the paths may be connected with the antenna via an interface 308, which may include any of various suitable RF devices, such as a switch, a duplexer, a diplexer, a multiplexer, and the like.

[0045] Receiving in-phase (I) and/or quadrature (Q) baseband analog signals from a digital-to-analog converter (DAC) 310, the TX path 302 may include a baseband filter (BBF) 312, a mixer 314, a driver amplifier (DA) 316, and a power amplifier (PA) 318. The BBF 312, the mixer 314, the DA 316, and the PA 318 may be included in a radio frequency integrated circuit (RFIC). For certain aspects, the PA 318 may be external to the RFIC.

[0046] The BBF 312 filters the baseband signals received from the DAC 310, and the mixer 314 mixes the filtered baseband signals with a transmit local oscillator (LO) signal to convert the baseband signal of interest to a different frequency (e.g., upconvert from baseband to a radio frequency). This frequency-conversion process produces the sum and difference frequencies between the LO frequency and the frequencies of the baseband signal of interest. The sum and difference frequencies are referred to as the “beat frequencies.” The beat frequencies are typically in the RF range, such that the signals output by the mixer 314 are typically RF signals, which may be amplified by the DA 316 and/or by the PA 318 before transmission by the antenna(s) 306. While one mixer 314 is illustrated, several mixers may be used to upconvert the filtered baseband signals to one or more intermediate frequencies and to thereafter upconvert the intermediate frequency (IF) signals to a frequency for transmission.

[0047] The RX path 304 may include a low noise amplifier (LNA) 324, a mixer 326, and a baseband filter (BBF) 328. The LNA 324, the mixer 326, and the BBF 328 may be included in one or more RFICs, which may or may not be the same RFIC that includes the TX path components. RF signals received via the antenna(s) 306 may be amplified by the LNA 324, and the mixer 326 mixes the amplified RF signals with a receive local oscillator (LO) signal to convert the RF signal of interest to a different baseband frequency (e.g., downconvert). The baseband signals output by the mixer 326 may be filtered by the BBF 328 before being converted by an analog-to-digital converter (ADC) 330 to digital I and/or Q signals for digital signal processing.

[0048] Certain transceivers may employ frequency synthesizers with a variablefrequency oscillator (e.g., a voltage-controlled oscillator (VCO) or a digitally controlled oscillator (DCO)) to generate a stable, tunable LO with a particular tuning range. Thus, the transmit LO may be produced by a TX frequency synthesizer 320, which may be buffered or amplified by amplifier 322 before being mixed with the baseband signals in the mixer 314. Similarly, the receive LO may be produced by an RX frequency synthesizer 332, which may be buffered or amplified by amplifier 334 before being mixed with the RF signals in the mixer 326. For certain aspects, a single frequency synthesizer may be used for both the TX path 302 and the RX path 304. In certain aspects, the TX frequency synthesizer 320 and/or RX frequency synthesizer 332 may include a frequency divider/multiplier that is driven by an oscillator (e.g., a VCO) in the frequency synthesizer. In some aspects, the transceiver circuit 300 may be implemented as part of a radio with memory retention, as described in more detail herein.

[0049] A controller 336 (e.g., controller/processor 280 in FIG. 2) may direct the operation of the RF transceiver circuit 300A, such as transmitting signals via the TX path 302 and/or receiving signals via the RX path 304. The controller 336 may be a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field- programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof. A memory 338 (e.g., memory 282 in FIG. 2) may store data and/or program codes for operating the RF transceiver circuit 300. The controller 336 and/or the memory 338 may include control logic (e.g., complementary metal-oxide-semiconductor (CMOS) logic).

[0050] While FIGs. 1-3 provide wireless communications as an example application in which certain aspects of the present disclosure may be implemented to facilitate understanding, certain aspects described herein may be used for any of various other suitable systems.

Introduction to Multi-Subscriber Identity Module (MSIM) Reception

[0051] Some Fifth-Generation (5G) New Radio (NR) and Long-Term Evolution (LTE) downlink receivers may include a primary receive path and a secondary (diversity) receive path. The two paths may form a downlink pipe (DLP). In some implementations, a DLP may support reception from just one base station registered with one subscriber identity module (SIM) at a time. Some applications support reception on two SIMs from two carriers using the same DLP. Thus, a local oscillator arrangement may support both diversity reception for a single SIM and single path reception (e.g., non-diversity) with two SIMs where a primary receive path (PRx) would connect to a base station or carrier of the first SIM and a diversity receive path (DRx) would connect to a base station or carrier of a second SIM. Some multi-SIM (MSIM) operations involve using multiple DLPs for different SIMs, and some MSIM operations use only one DLP with a PRx and a DRx for different SIMs.

[0052] FIG. 4 illustrates a DLP 400 including a PRx 402 and DRx 404. The PRx 402 may include at least one antenna 406 coupled to a radio frequency (RF) front-end (FE) 408. The RF FE 408 may include a low-noise amplifier (LNA) (e.g., corresponding to LNA 324 of FIG. 3) for amplifying a signal received from the antenna. The amplified signal may be provided to a mixer 410 (e.g., corresponding to mixer 326 of FIG. 3) for downconversion (e.g., signal downconversion from RF to a baseband (BB) frequency) using a LO signal (not shown). The mixer 410 generates a BB signal that is provided to a baseband filter (BBF) 412 (e.g., corresponding to the BBF 328 of FIG. 3) to generate a filtered signal that is then converted from the analog domain to the digital domain via an analog-to-digital converter (ADC) (e.g., corresponding to ADC 330 of FIG. 3) and demodulated using demodulation circuitry 414.

[0053] Similarly, the DRx 404 may include at least one antenna 426 coupled to an RF FE 428. The RF FE 428 may include an LNA for amplifying a signal received from the antenna. The amplified signal may be provided to a mixer 430 for downconversion (e.g., from RF to a BB frequency) using another LO signal. The mixer 430 generates a BB signal that is provided to a BBF 432 to generate a filtered signal that is then converted from the analog domain to the digital domain via an ADC and demodulated using demodulation circuitry 434.

[0054] In some aspects, multiple synthesizers 491, 493 may be used to generate the local oscillator signals, such as a low-performance mode (LPM) synthesizer 493 (e.g., implemented using a ring oscillator) and a high-performance mode (HPM) synthesizer 491 (e.g., implemented using an inductor-capacitor (LC) oscillator). The LO signal from synthesizer 491 may be provided to multiplexers 496, 498 (e.g., through a frequency divider 494, labeled “Div N”), and the LO signal from synthesizer 493 may be provided to the multiplexers 496, 498 through a buffer 499. The multiplexers 496, 498 may be controlled to direct each LO signal to either the PRx or DRx (e.g., to either mixer 410 for the PRx 402 or mixer 430 for the DRx 404 for downconversion). For some MSIM applications, the PRx may be associated with a first subscriber (SUB1), and the DRx may be associated with a second subscriber (SUB2) or vice versa.

[0055] In some cases, one receive path (e.g., PRx 402) may be used for traffic, and the other receive path (e.g., DRx 404) may be used for page reception or vice versa. In some cases the receive path used for traffic may use a high-performance synthesizer (e.g., synthesizer 491) with good phase noise. The receive path used for page reception may use the low-performance synthesizer (e.g., synthesizer 493) with relaxed phase noise constraints to save the transceiver’ s power, area, and cost. In some other cases, when the signal-to-noise ratio (SNR) specification for traffic is low, traffic may use the low- performance synthesizer (e.g., synthesizer 493). In such cases, page reception may be performed through a high-performance synthesizer (e.g., synthesizer 491). While FIG. 4 provide a DLP as an example application in which certain aspects of the present disclosure may be implemented to facilitate understanding, certain aspects described herein may be used for any of various other suitable systems.

Example Techniques for Multi-Subscriber Identity Module (MSIM) Operations with Memory Retention

[0056] A transceiver supporting a multi -sub scriber identity module (MSIM) in dual receive (DR)-dual SIM dual standby (DSDS) mode may load control registers for a transceiver more often as compared to single-SIM applications. For example, registers may be loaded when a wireless device switches between subscribers (SUBs). Communication settings (e.g., such as gain information for signal amplification, frequency synthesizer settings, path selection settings, or circuit component enable settings) may be stored in memory and transferred to registers of the transceiver to be used for signal communication (e.g., reception via one or more SUBs). After a communication phase, the wireless device may enter idle mode. During idle mode (e.g., when all subscribers of the wireless device are in idle mode), the voltage rail for the memory storing the communication settings may be disabled (e.g., the supply voltage source may be turned off) to save power. As a result, the communication settings may be lost when the wireless device enters idle mode. In some cases, a fast control interface may be used to load the communication settings back into the registers of the transceiver, or the timelines for communication may be expanded to allow a slow interface sufficient time to load the registers, resulting in increased power consumption or communication inefficiencies. Certain aspects of the present disclosure are directed towards a memory retention scheme to keep information (e.g., communication settings) intact in memory while both SUBs are in idle mode, allowing for faster tuning of the transceiver for communication after exiting idle mode.

[0057] FIG. 5 is a block diagram of a wireless device 500 implemented with memory retention, in accordance with certain aspects of the present disclosure. As shown, the device 500 may include a modem 502 coupled to a radio 504 via one or more interfaces, such as an RF front-end (RFFE) interface (e.g., including clock and data lines) and a general-purpose input/output (GPIO) control interface, as shown. In some aspects, the modem 502 may include a finite state machine (FSM) 530 to control the operations of the radio 504.

[0058] The radio may include a controller 506, which may implement an FSM. The controller 506 may have outputs coupled to a memory 510 and a control input of a regulator 508 (e.g., dual-voltage low dropout (LDO) regulator). The regulator 508 may receive an external supply voltage (e.g., a supply voltage VDD from a voltage generator external to the radio 504). The regulator 508 may be configured to provide either a nominal supply voltage or a retention mode supply voltage in MSIM mode. For instance, the regulator 508 may regulate the supply voltage VDD to generate a first output voltage for a nominal operating mode and a second output voltage for memory retention mode, where the second output voltage is less than the first output voltage. The memory 510 may be used to store communication settings for communication via a transceiver 512 (e.g., the RF transceiver circuit 300 of FIG. 3). Communication settings may be stored in the memory 510, which may be latched to the one or more registers 513 of the transceiver 512 to configure the transceiver 512 (e.g., setting a gain state of the transceiver) for communication.

[0059] A dedicated trigger via the GPIO control interface may be used to trigger an enter-and-exit sequence of memory retention in MSIM mode. In some aspects, the memory may be allocated to store programming scripts as part of the communication settings for one or more communication configurations (e.g., reception using SUB1 and SUB2, different bandwidth parts (BWPs), or synthesizers), allowing just-in-time programming in MSIM mode and saving time that would otherwise be spent reloading the programming scripts from the modem 502 to the memory 510 of the radio 504. For instance, different communication settings (e.g., gain states) may be stored in memory. The modem 502 may send, to the transceiver 512, a start address of memory 510 at which one or more communication settings (e.g., gain state) may be stored. The transceiver 512 may then execute the transfer of the communication settings from the memory 510 to the registers 513 of the transceiver 512.

[0060] In some implementations, different portions of the memory 510 may be used to store communication settings for different transceiver configurations. The different transceiver configurations may include, for example, different SUBs, different radio access technologies (RATs) such as wireless wide area network (WWAN) or global navigation satellite system (GNSS), or different synthesizers (e.g., synthesizer 491 or synthesizer 493) to be used for communication. For example, a portion of the memory 510 may be used to store communication settings when receiving using SUB1, and another portion of memory may be used to store communication settings when receiving using SUB2, allowing the transceiver to switch between those communication settings during a communication phase. While the memory is in retention mode for MSIM mode, other voltage rails (not shown in FIG. 5) of the radio 504 (e.g., voltage rail for the transceiver) may be disabled (e.g., collapsed) as the retained memory contents may be used to reprogram sub-blocks within the radio 504, saving power.

[0061] FIG. 6 is a timing diagram illustrating the timing of memory loading and signal reception using one or more subscribers without memory retention. As shown, one or more triggers 602 (e.g., including a trigger from the modem 502 received by the radio 504 via the GPIO control interface shown in FIG. 5) may be used to wake up the transceiver 512, followed by SUB1 communication 606 during a communication phase. Once the communication phase is completed, one or more triggers 604 from the modem may be used to enter the radio 504 in idle mode. For example, in response to the one or more triggers 604, one or more supply voltages for the radio 504 may be disabled to save power.

[0062] The transceiver 512 may remain in idle mode for a time period 608. Before exiting idle mode, the modem 502 may reload (e.g., using the RFFE interface) communication settings in the memory 510 during time period 610. The time period 610 may be, for example, 5 ms to 15 ms. Once the memory 510 is reloaded, the communication settings stored in the memory 510 may be latched into the registers 513 of the transceiver 512 for signal communication. After the time period 610, one or more triggers 612 may be used to wake up the transceiver 512 for a communication phase including a SUB2 communication 614. One or more triggers 616 may be used to reenter idle mode, followed by another idle time period 670 and another memory load time period 672. Multiple cycles each including an idle time period and a memory load time period before a communication phase of the radio may be performed. In some cases, as shown in FIG. 6, once the transceiver exits idle mode (e.g., after time period 672), the communication phase may include communication via different subscribers (e.g., SUB1, SUB2) and/or radio access technologies (e.g., global navigation satellite system (GNSS)).

[0063] The memory retention techniques described herein may be used to save (or at least reduce) the load time period of the memory 510, such as the memory load time period 610 or the memory load time period 672. The controller 506 may control the regulator 508 and memory 510 to facilitate hardware sequencing (e.g., power and clock sequencing) when entering and exiting retention mode. For example, to enter the idle mode, the controller 506 may control the regulator 508 to reduce the supply voltage provided to the memory 510, placing the memory in retention mode. Moreover, to place the memory 510 in retention mode, the controller 506 may control the memory to place support logic of the memory in a reset state so that memory operations do not occur during the retention mode. With memory retention, previously stored communication settings may be retained in the memory 510. Thus, after the idle time period 608, the controller 506 may control regulator 508 to increase the supply voltage provided to the memory 510 and activate the support logic of the memory 510 to wake up the memory (e.g., exit retention mode), allowing the communication settings to be transferred to the registers of the transceiver 512, saving time that would otherwise be spent to reload the memory 510.

[0064] FIG. 7 is a timing diagram 700 illustrating example signals during different operating phases of a wireless device using memory retention, in accordance with certain aspects of the present disclosure. As shown, during a bootup phase, multiple voltage rails (e.g., VDD1 to VDD4) may be activated. During a nominal phase (e.g., a reception (Rx) phase), signal reception may occur using one or more transceiver configurations (e.g., subscribers or RATs), as described herein. Following the nominal phase, the radio of the wireless device may enter idle mode with memory retention in response to a trigger 702 from the modem 502 via the GPIO control interface, as shown. During the idle mode, VDD1 (e.g., corresponding to VDD provided to the controller 506 and regulator 508 in FIG. 5) may remain active, while other voltage rails (e.g., VDD2 to VDD4 for other radio circuits such as the transceiver 512) may be deactivated (e.g., collapsed). As described, the regulator 508 may receive VDD1 and provide a reduced voltage (e.g., a supply voltage less than VDD1) to the memory 510 so that memory 510 enters a low-power mode of operation while retaining the previously stored settings in the memory. In order to exit idle mode, VDD2 to VDD4 may be first reactivated, followed by a trigger 704 from the modem 502 via the GPIO control interface that triggers the controller 506 to exit the idle mode. For example, the controller 506 may control the regulator 508 to increase the supply voltage provided to the memory to exit retention mode. A nominal mode for signal reception follows the idle mode. At some point, the wireless device may power down, and the voltage rails VDD1 to VDD4 may be deactivated, as shown. While four voltage rails are shown, any number of voltage rails may be used.

[0065] FIG. 8 is a state diagram 800 showing different states of an FSM, such as the FSM 530 of the modem 502, in accordance with certain aspects of the present disclosure. While the state diagram 800 is described with respect to activation and deactivation of WWAN and GNSS for a wireless device to facilitate understanding, certain aspects of the present disclosure may be applied for the activation and deactivation of any suitable configurations or wireless technologies.

[0066] As shown, the radio may be in a shutdown state 802. The WWAN for the device may be turned on. Thus, at state 804, the WWAN may be on (activated), and GNSS may be off (deactivated). If the WWAN is turned back off, the FSM 530 may be transitioned back to the shutdown state 802. On the other hand, to enter idle mode (e.g., sleep state), the FSM 530 may receive a request to enter memory retention mode for the WWAN (e.g., labeled “WWAN Enter req”). Therefore, as described, the FSM 530 of the modem 502 may be used to send one or more trigger signals to configure the memory 510 in memory retention mode to retain the communication settings for the WWAN, as described herein. Thus, at state 806, the memory 510 is in retention mode for WWAN, and GNSS is off. If WWAN is turned on via a WWAN on request, the FSM 530 may send one or more trigger signals to configure the memory 510 to exit memory retention mode, and the FSM 530 transitions back to state 804, as shown. [0067] From state 806, the GNSS may be turned on via a GNSS on request, resulting in a transition from state 806 to state 808. At state 808, the memory 510 may be in retention mode for WWAN, and GNSS may be on. Based on a request to turn on WWAN, the FSM 530 may send one or more trigger signals to exit the memory 510 from retention mode for WWAN, resulting in the transition from state 806 to state 808, as shown. From state 812, the WWAN may be turned off, resulting in a transition from state 812 to state 810. From state 810, the GNSS may also be turned off, resulting in a shutdown of the radio at state 802.

[0068] Certain aspects of the present disclosure may be implemented with memory allocation for communication settings that facilitate a reduction of radio timelines (e.g., reduction of load time period 610) across various communication scenarios, such as BWP switching or synthesizer swapping. Different memory portions may be used for different transceiver configurations (e.g., different subscribers, BWPs, RATs, or synthesizers), allowing the radio to switch between the communication settings during a communication phase for the different configurations.

[0069] FIG. 9 is a flow diagram illustrating example operations 900 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 900 may be performed, for example, by a wireless device such as the wireless device 500 of FIG. 5.

[0070] At block 902, the wireless device stores one or more communication settings for signal communication in memory (e.g., memory 510). At block 904, the wireless device performs a first signal communication (e.g., via transceiver 512) using the one or more communication settings.

[0071] At block 906, the wireless device enters an idle mode of operation after performing the signal communication. For example, a radio of the wireless device may receive, from a modem (e.g., modem 502), a trigger signal. Entering the idle mode may be in response to the trigger signal.

[0072] At block 908, the wireless device may retain the one or more communication settings in the memory during the idle mode. At block 910, the wireless device performs a second signal communication (e.g., via transceiver 512) after the idle mode using the one or more communication settings retained in the memory. In some aspects, the second signal communication may be performed via at least one of: one or more subscribers; one or more bandwidth parts (BWPs); or one or more radio access technologies.

[0073] In some aspects, the wireless device may control (e.g., via controller 506) a regulator (e.g., regulator 508) to provide a first supply voltage (e.g., VDD of FIG. 5 or VDD1 of FIG. 7) to the memory before entering the idle mode, and control the regulator to provide a second supply voltage to the memory during the idle mode to retain the one or more communication settings in the memory. The second supply voltage may be less than the first supply voltage. In some aspects, one or more third supply voltages (e.g., VDD2, VDD3, and VDD4 of FIG. 7) may be provided to a transceiver (e.g., transceiver 512) to perform the first signal communication and the second signal communication. The wireless device may disable the one or more third supply voltages in the idle mode.

[0074] In some aspects, the one or more communication settings may be stored for multiple transceiver configurations. The wireless device may select one or more of the multiple transceiver configurations for the second signal communication. The wireless device may transfer the one or more communication settings for the one or more of the multiple transceiver configurations to one or more registers (e.g., registers 513) for a transceiver to perform the second signal communication. The multiple transceiver configurations may be associated with at least one of: one or more subscribers to be used for the second signal communication; one or more bandwidth parts (BWPs) to be used for the second signal communication; one or more frequency synthesizers to be used for the second signal communication; or one or more radio access technologies to be used for the second signal communication.

Example Aspects

[0075] In addition to the various aspects described above, specific combinations of aspects are within the scope of the present disclosure, some of which are detailed below:

[0076] Aspect 1 : A method for wireless communication, comprising: storing one or more communication settings for signal communication in a memory; performing a first signal communication using the one or more communication settings; entering an idle mode of operation after performing the signal communication; retaining the one or more communication settings in the memory during the idle mode; and performing a second signal communication after the idle mode using the one or more communication settings retained in the memory.

[0077] Aspect 2: The method of Aspect 1, further comprising: controlling a regulator to provide a first supply voltage to the memory before entering the idle mode; and controlling the regulator to provide a second supply voltage to the memory during the idle mode to retain the one or more communication settings in the memory, the second supply voltage being less than the first supply voltage.

[0078] Aspect 3 : The method of Aspect 2, wherein one or more third supply voltages are provided to a transceiver to perform the first signal communication and the second signal communication, the method further comprising disabling the one or more third supply voltages in the idle mode.

[0079] Aspect 4: The method according to any of Aspects 1-3, wherein: the one or more communication settings are stored for multiple transceiver configurations; and the method further comprises: selecting one or more of the multiple transceiver configurations for the second signal communication; and transferring the one or more communication settings for the one or more of the multiple transceiver configurations to one or more registers for a transceiver to perform the second signal communication.

[0080] Aspect 5: The method of Aspect 4, wherein the multiple transceiver configurations are associated with at least one of: one or more subscribers to be used for the second signal communication; one or more bandwidth parts (BWPs) to be used for the second signal communication; one or more frequency synthesizers to be used for the second signal communication; or one or more radio access technologies to be used for the second signal communication.

[0081] Aspect 6: The method according to any of Aspects 1-5, further comprising receiving, from a modem, a trigger signal, wherein entering the idle mode is in response to the trigger signal.

[0082] Aspect 7: The method according to any of Aspects 1-6, further comprising transferring the one or more communication settings to one or more registers for a transceiver, wherein the second signal communication is performed via the transceiver after the one or more communication settings are transferred. [0083] Aspect 8: An apparatus for wireless communication, comprising: a controller; a regulator having a control input coupled to the controller; memory having a voltage supply input coupled to an output of the regulator, wherein the controller is configured to control the regulator to retain one or more communication settings in the memory during an idle mode of the apparatus; and a transceiver coupled to the memory.

[0084] Aspect 9: The apparatus of Aspect 8, wherein: the regulator is configured to generate a first output voltage during a communication phase of the apparatus and a second output voltage during the idle mode of the apparatus, the second output voltage being less than the first output voltage; and the controller is configured to control the regulator to generate the second output voltage to be provided to the memory to retain the one or more communication settings.

[0085] Aspect 10: The apparatus of Aspect 8 or 9, wherein the memory is configured to: store the one or more communication settings for each of multiple transceiver configurations; and transfer the one or more communication settings for one or more of the multiple transceiver configurations to one or more registers for the transceiver to perform a signal communication.

[0086] Aspect 11 : The apparatus of Aspect 10, wherein the multiple transceiver configurations are associated with at least one of: one or more subscribers to be used for communication via the transceiver; one or more bandwidth parts (BWPs) to be used for communication via the transceiver; one or more frequency synthesizers to be used for communication via the transceiver; or one or more radio access technologies to be used be used for communication via the transceiver.

[0087] Aspect 12: The apparatus according to any of Aspects 8-11, wherein the transceiver is configured to perform a communication during a communication phase based on the one or more communication settings after exiting the idle mode.

[0088] Aspect 13: The apparatus according to any of Aspects 8-12, wherein the controller is configured to execute a finite state machine (FSM).

[0089] Aspect 14: The apparatus according to any of Aspects 8-13, wherein the memory is configured to transfer the one or more communication settings to one or more registers for the transceiver to perform a signal communication. [0090] Aspect 15: An apparatus for wireless communication comprising: a memory configured to store one or more communication settings; a transceiver configured to perform a first signal communication using the one or more communication settings, wherein the apparatus is configured to enter an idle mode after the first signal communication; and a controller configured to cause the memory to retain the one or more communication settings during the idle mode, wherein the transceiver is further configured to perform a second signal communication after the idle mode using the one or more communication settings retained in the memory.

[0091] Aspect 16: The apparatus of Aspect 15, further comprising a regulator, wherein the controller is configured to control the regulator to: provide a first supply voltage to the memory before entering the idle mode; and provide a second supply voltage to the memory during the idle mode to retain the one or more communication settings in the memory, the second supply voltage being less than the first supply voltage.

[0092] Aspect 17: The apparatus of Aspect 15 or 16, wherein the memory is configured to store the one or more communication settings for each of multiple transceiver configurations and wherein the transceiver is configured to perform the second signal communication via one or more of the multiple transceiver configurations.

[0093] Aspect 18: The apparatus of Aspect 17, wherein the multiple transceiver configurations are associated with at least one of: one or more subscribers to be used for the second signal communication; one or more bandwidth parts (BWPs) to be used for the second signal communication; one or more frequency synthesizers to be used for the second signal communication; or one or more radio access technologies to be used for the second signal communication.

[0094] Aspect 19: The apparatus according to any of Aspects 15-18, wherein the controller is configured to receive a trigger signal from a modem, and wherein the controller is configured to cause the memory to retain the one or more communication settings in response to the trigger signal.

[0095] Aspect 20: The apparatus according to any of Aspects 15-19, wherein the memory is configured to transfer the one or more communication settings to one or more registers for the transceiver and wherein the second signal communication is performed after the one or more communication settings are transferred. [0096] The above description provides examples, and is not limiting of the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0097] The various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and/or software component(s) and/or module(s), including, but not limited to a circuit, an application-specific integrated circuit (ASIC), or processor. Generally, where there are operations illustrated in figures, those operations may have corresponding counterpart means-plus-function components.

[0098] As used herein, a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b. or c” is intended to cover: a, b. c, a-b. a-c, b-c. and a-b-c, as well as any combination with multiples of the same element (e.g., a-a. a-a-a. a-a-b. a-a-c. a-b-b, a- c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b. and c).

[0099] The methods disclosed herein comprise one or more steps or actions for achieving the described method. The method steps and/or actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims. [0100] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes, and variations may be made in the arrangement, operation, and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication, comprising: storing one or more communication settings for signal communication in memory; performing a first signal communication using the one or more communication settings; entering an idle mode of operation after performing the signal communication; retaining the one or more communication settings in the memory during the idle mode; and performing a second signal communication after the idle mode using the one or more communication settings retained in the memory.

2. The method of claim 1, further comprising: controlling a regulator to provide a first supply voltage to the memory before entering the idle mode; and controlling the regulator to provide a second supply voltage to the memory during the idle mode to retain the one or more communication settings in the memory, the second supply voltage being less than the first supply voltage.

3. The method of claim 2, wherein one or more third supply voltages are provided to a transceiver to perform the first signal communication and the second signal communication, the method further comprising disabling the one or more third supply voltages in the idle mode.

4. The method of claim 1, wherein: the one or more communication settings are stored for multiple transceiver configurations; and the method further comprises: selecting one or more of the multiple transceiver configurations for the second signal communication; and transferring the one or more communication settings for the one or more of the multiple transceiver configurations to one or more registers for a transceiver to perform the second signal communication.

5. The method of claim 4, wherein the multiple transceiver configurations are associated with at least one of: one or more subscribers to be used for the second signal communication; one or more bandwidth parts (BWPs) to be used for the second signal communication; one or more frequency synthesizers to be used for the second signal communication; or one or more radio access technologies to be used for the second signal communication.

6. The method of claim 1, further comprising receiving, from a modem, a trigger signal, wherein entering the idle mode is in response to the trigger signal.

7. The method of claim 1, further comprising transferring the one or more communication settings to one or more registers for a transceiver, wherein the second signal communication is performed via the transceiver after the one or more communication settings are transferred.

8. An apparatus for wireless communication, comprising: a controller; a regulator having a control input coupled to the controller; memory having a voltage supply input coupled to an output of the regulator, wherein the controller is configured to control the regulator to retain one or more communication settings in the memory during an idle mode of the apparatus; and a transceiver coupled to the memory.

9. The apparatus of claim 8, wherein: the regulator is configured to generate a first output voltage during a communication phase of the apparatus and a second output voltage during the idle mode of the apparatus, the second output voltage being less than the first output voltage; and the controller is configured to control the regulator to generate the second output voltage to be provided to the memory to retain the one or more communication settings.

10. The apparatus of claim 8, wherein the memory is configured to: store the one or more communication settings for each of multiple transceiver configurations; and transfer the one or more communication settings for one or more of the multiple transceiver configurations to one or more registers for the transceiver to perform a signal communication.

11. The apparatus of claim 10, wherein the multiple transceiver configurations are associated with at least one of: one or more subscribers to be used for communication via the transceiver; one or more bandwidth parts (BWPs) to be used for communication via the transceiver; one or more frequency synthesizers to be used for communication via the transceiver; or one or more radio access technologies to be used be used for communication via the transceiver.

12. The apparatus of claim 8, wherein the transceiver is configured to perform a communication during a communication phase based on the one or more communication settings after exiting the idle mode.

13. The apparatus of claim 8, wherein the controller is configured to execute a finite state machine (FSM).

14. The apparatus of claim 8, wherein the memory is configured to transfer the one or more communication settings to one or more registers for the transceiver to perform a signal communication.

15. An apparatus for wireless communication comprising: memory configured to store one or more communication settings; a transceiver configured to perform a first signal communication using the one or more communication settings, wherein the apparatus is configured to enter an idle mode after the first signal communication; and a controller configured to cause the memory to retain the one or more communication settings during the idle mode, wherein the transceiver is further configured to perform a second signal communication after the idle mode using the one or more communication settings retained in the memory.

16. The apparatus of claim 15, further comprising a regulator, wherein the controller is configured to control the regulator to: provide a first supply voltage to the memory before entering the idle mode; and provide a second supply voltage to the memory during the idle mode to retain the one or more communication settings in the memory, the second supply voltage being less than the first supply voltage.

17. The apparatus of claim 15, wherein the memory is configured to store the one or more communication settings for each of multiple transceiver configurations and wherein the transceiver is configured to perform the second signal communication via one or more of the multiple transceiver configurations.

18. The apparatus of claim 17, wherein the multiple transceiver configurations are associated with at least one of one or more subscribers to be used for the second signal communication; one or more bandwidth parts (BWPs) to be used for the second signal communication; one or more frequency synthesizers to be used for the second signal communication; or one or more radio access technologies to be used for the second signal communication.

19. The apparatus of claim 15, wherein the controller is configured to receive a trigger signal from a modem and wherein the controller is configured to cause the memory to retain the one or more communication settings in response to the trigger signal.

20. The apparatus of claim 15, wherein the memory is configured to transfer the one or more communication settings to one or more registers for the transceiver and wherein the second signal communication is performed after the one or more communication settings are transferred.