WO2021223096A1

WO2021223096A1 - System information sharing in dual sim devices

Info

Publication number: WO2021223096A1
Application number: PCT/CN2020/088749
Authority: WO
Inventors: Haojun WANG; Yi Liu; Jinglin Zhang; Zhenqing CUI; Hong Wei
Original assignee: Qualcomm Incorporated
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2021-11-11

Abstract

Certain aspects of the present disclosure provide techniques for system information sharing in dual subscriber identity module (SIM) devices. A method that may be performed by a user equipment (UE) includes triggering a request procedure for a first subscription of the UE to request system information of a first cell associated with a network, detecting, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and communicating with the first cell using the first subscription based on the detection.

Description

SYSTEM INFORMATION SHARING IN DUAL SIM DEVICES

BACKGROUND

Field of the Disclosure

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for sharing system information in dual subscriber identity module (SIM) devices.

Description of Related Art

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. ) . Examples of such multiple-access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few.

These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) . To these ends, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in NR and LTE technology. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

SUMMARY

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 improved service recover after termination of a call in a dual subscriber identity module (SIM) device.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication by a user equipment (UE) . The apparatus generally includes a processing system configured to: trigger a request procedure for a first subscription of the UE to request system information of a first cell associated with a network; detect, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and communicate with the first cell using the first subscription based on the detection.

Certain aspects of the subject matter described in this disclosure can be implemented in a method for wireless communication by a user equipment (UE) . The method generally includes triggering a request procedure for a first subscription of the UE to request system information of a first cell associated with a network; detecting, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and communicating with the first cell using the first subscription based on the detection.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication by a user equipment (UE) . The apparatus generally includes means for triggering a request procedure for a first subscription of the UE to request system information of a first cell associated with a network; means for detecting, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and means for communicating with the first cell using the first subscription based on the detection.

Certain aspects of the subject matter described in this disclosure can be implemented in a computer-readable medium for wireless communication by a user equipment (UE) . The apparatus generally includes instructions executable by an apparatus to: trigger a request procedure for a first subscription of the UE to request system information of a first cell associated with a network; detect, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and communicate with the first cell using the first subscription based on the detection.

Certain aspects of the subject matter described in this disclosure can be implemented in a user equipment (UE) for wireless. The UE generally includes at least one antenna and a processing system configured to: trigger a request procedure for a first subscription of the UE to request system information of a first cell associated with a network; detect, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and communicate with the first cell using the first subscription based on the detection.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the appended drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.

BRIEF DESCRIPTION OF THE DRAWINGS

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 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.

FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.

FIG. 2 is a block diagram conceptually illustrating a design of an example a base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.

FIG. 3 is an example frame format for new radio (NR) , in accordance with certain aspects of the present disclosure.

FIG. 4 is a flow diagram illustrating example operations for wireless communication by a UE, in accordance with certain aspects of the present disclosure.

FIG. 5 is a decision flow diagram illustrating example operations for performing a system information request procedure, in accordance with certain aspects herein, in accordance with certain aspects of the present disclosure.

FIG. 6 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.

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

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums sharing system information in dual subscriber identity module (SIM) devices. For example, in some cases, the techniques presented herein allow a user equipment (UE) to share system information for a first cell between a first subscription and a second subscription of the UE. For example, when a system information request procedure is triggered for a first subscription to obtain system information of the first cell, the UE may detect whether the system information is already stored at the UE in a database associated with second subscription. If the system information of the first cell is stored locally in the database associated with the second subscription, the UE may retrieve the system information of the first cell from the database associated with the second subscription and store the system information of the first cell in a database associated with the first subscription. The UE may then communicate with the first cell using the first subscription based on the retrieved system information of the first cell.

The following description provides examples of sharing system information in dual SIM devices, 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. 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.

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, etc. A frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.

The techniques described herein may be used for various wireless networks and radio technologies. While aspects may be described herein using terminology commonly associated with 3G, 4G, and/or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.

NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC) . These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements. In addition, these services may co-exist in the same subframe. NR supports beamforming and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.

FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be an NR system (e.g., a 5G NR network) . As shown in FIG. 1, the wireless communication network 100 may be in communication with a core network 132. The core network 132 may in communication with one or more base station (BSs) 110 and/or user equipment (UE) 120 in the wireless communication network 100 via one or more interfaces.

As illustrated in FIG. 1, the wireless communication network 100 may include a number of BSs 110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and other network entities. 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 110. 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 communication 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 110x may be a pico BS for a pico cell 102x. The BSs 110y and 110z may be femto BSs for the

femto cells

102y and 102z, respectively. A BS may support one or multiple cells. A network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110 (e.g., via a backhaul) .

The BSs 110 communicate with UEs 120a-y (each also individually referred to herein as UE 120 or collectively as UEs 120) in the wireless communication network 100. The UEs 120 (e.g., 120x, 120y, etc. ) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile. Wireless communication network 100 may also include relay stations (e.g., relay station 110r) , 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 sends 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.

According to certain aspects, the BSs 110 and UEs 120 may be configured for sharing system information in dual subscriber identity module (SIM) devices. For example, as shown in FIG. 1, the UE 120a includes a system information module 122. The system information module 122 may be configured to perform the operations illustrated in FIGs. 4 and 5, as well as other operations described herein for sharing system information in dual SIM devices, in accordance with aspects of the present disclosure.

FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., in the wireless communication network 100 of FIG. 1) , which may be used to implement aspects of the present disclosure.

At the BS 110a, a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240. The control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc. The data may be 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 physical downlink shared channel (PDSCH) , a physical uplink shared channel (PUSCH) , or a physical sidelink shared channel (PSSCH) .

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) , and channel state information reference signal (CSI-RS) . 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) 232a-232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.

At the UE 120a, the antennas 252a-252r may receive the downlink signals from the BS 110a and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 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 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.

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., for 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 in transceivers 254a-254r (e.g., for 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 modulators 232, 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.

The

memories

242 and 282 may store data and program codes for BS 110a and UE 120a, respectively. A scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.

Antennas 252,

processors

266, 258, 264, and/or controller/processor 280 of the UE 120a and/or antennas 234,

processors

220, 230, 238, and/or controller/processor 240 of the BS 110a may be used to perform the various techniques and methods described herein for improving service recovery after call termination in the dual SIM device. For example, as shown in FIG. 2, the controller/processor 280 of the UE 120a includes a system information module 281 that may be configured to perform the operations illustrated in FIGs. 4 and 5, as well as other operations described herein for sharing system information in dual subscriber identity module (SIM) devices, according to aspects described herein. Although shown at the controller/processor, other components of the UE 120a and BS 110a may be used to perform the operations described herein.

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 minimum resource allocation, called a resource block (RB) , may be 12 consecutive subcarriers. The system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs. NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. ) .

FIG. 3 is a diagram showing an example of a frame format 300 for NR. The transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9. Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, …slots) depending on the SCS. Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the SCS. The symbol periods in each slot may be assigned indices. A mini-slot, which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) . Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched. The link directions may be based on the slot format. Each slot may include DL/UL data as well as DL/UL control information.

Example System Information Sharing in Dual SIM Devices

In certain cases, two different subscriptions may be supported on a same device, such as a user equipment, and are based on two separate subscriber identification module (SIMs) , known as multi-SIM (MSIM) . These subscriptions could be on the same radio network or different radio networks and could have different subscription profiles and Quality of Service (QOS) requirements. Further, different subscriptions may provide services on the same or different radio access technologies (RATs) . Generally, MSIM solutions use less resources while performing operations on two different RATs than that needed by two independent solutions with the goal of optimizing resource (RF, MIPs, etc. ) usage as well as providing enhanced user experience.

In some cases, different classes of radio frequency (RF) solutions exist for MSIM devices. For example, in some cases, the device may include a dual transceiver that may provide dual receive and dual access (DSDA) . For example, in this case, each subscription may correspond to its own transceiver. In other cases, the device may include a single transceiver where two SIMS/subscriptions share the same radio resources and the device may operate in a dual SIM dual standby (DSDS) mode in which both SIMs may both be on standby and aware of the state for their respective networks. Due to RF complexity, cost, and power consumption considerations, the majority of legacy Dual subscription devices and solutions share a single transceiver.

With 5G New Radio (NR) deployments aggressively moving ahead globally, MSIM solutions now comprise of a combination of 5G + 4G/3G/2G RATs. There are two 5G solutions defined by Rel15 3GPP standards: non-standalone (NSA) and standalone 5G (SA) . In the SA 5G NR architecture, both signaling network and radio may be handled by 5G Core. In contrast, in 5G NSA networks, a long term evolution (LTE) core network and LTE radio access may be used as an anchor for all signaling and mobility management while adding a new 5G Carrier. This architecture is attractive for early deployments of 5G NR access systems as networks may reuse the legacy operational LTE eNodeB (eNB) and evolved packet core (EPC) . Non-standalone solutions are also attractive as they facilitate a seamless migration from 4G to 5G for networks leveraging existing LTE core network.

Registration time is big concern for 5G SA devices as bandwidth is very large and synchronization signal block (SSB) are not in a fixed location. Additionally, 5G networks have introduced an on-demand system information reading procedure in which the UE occasionally has to trigger a random access channel (RACH) procedure to obtain system information of a cell (e.g., when a cell does not broadcast system information) , leading to a significant amount of time to acquire all the system information associated with the cell. Dual SIM card DSDS or DSDA user equipments have become very popular and there is a high possibility that each SIM card camps on a same cell, especially when each SIM is associated with a same operator. However, when both SIMs camp on a same cell, the dual SIM user equipment has to acquire the same cell system information twice since both SIMs read the cell system information separately.

For example, suppose a dual SIM UE includes a first SIM associated with a first subscription and a second SIM associated with a second subscription. Additionally, assume that the first SIM/first subscription and second SIM/second subscription are both associated with a same first cell.

According to aspects, when the dual SIM UE is powered on, the UE may first perform a cell search corresponding to the first SIM and first subscription and decode a master information block (MIB) from the first cell. Thereafter, the UE may use parameters received in the MIB to decode a first system information block (SIB1) from the first cell (provided the UE is not barred from accessing the first cell) . Thereafter, if the first cell is not broadcasting system information (e.g., if si-BroadcastStatus is notBroadcasting) , the UE triggers transmission of a RACH preamble to request any remaining system information from the first cell corresponding to the first subscription. Thereafter, the UE may receive and decode the remaining system information corresponding to the first subscription after it receives an acknowledgement for the system information request.

Once the UE finishes receiving and decoding the system information corresponding to the first SIM and first subscription, the UE may then perform substantially the same procedure to obtain system information for the second SIM and second subscription, even though the UE has already received and decoded the MIB from the first cell when performing the procedure for the first SIM/first subscription. Having to acquire system information twice for two separate SIMs when each of those SIMs camp on the same cell unnecessarily wastes time, power, and signaling resources at the UE.

Accordingly, aspects of the present disclosure provide techniques for sharing system information among subscriptions (e.g., SIMs) of a dual SIM UE, reducing the registration, selection, reselection, and out of service time of the dual SIM UE and leading to power savings at the dual SIM UE.

FIG. 4 is a flow diagram illustrating example operations 400 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 400 may be performed, for example, by UE (e.g., such as a UE 120a in the wireless communication network 100) . Operations 400 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2) . Further, the transmission and reception of signals by the UE in operations 400 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2) . In certain aspects, the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.

The operations 400 may begin, at 402, by triggering a system information request procedure for a first subscription of the UE to request system information of a first cell associated with a network.

At block 404, the UE detects, in response to triggering the system information request procedure, whether the system information of the first cell is stored locally in a database associated with a second subscription of the UE.

At block 406, the UE communicates with the first cell using the first subscription based on the detection. In some cases, as explained below, communicating with the first cell may be based on the UE retrieving the system information of the first cell from the database associated with the second subscription or based on the UE obtaining the system information of the first cell from the first cell, as described below.

As noted above, aspects of the present disclosure provide techniques for sharing system information among subscriptions (e.g., SIMs) of a dual SIM UE. For example, as noted, the UE may include a first subscription and a second subscription. The UE may maintain a separate databased of system information associated with each subscription. For example, the first subscription may be associated with a first database for storing system information and the second subscription may be associated with a different database for storing system information. In some cases, system information stored in each database may be indexed according to a global synchronization channel number (GSCN) and a physical cell identifier (PCI) , which uniquely identifies system information corresponding to a particular cell/PCI. In some cases, each database may be capable of storing between 10 and 20 PCIs and associated system information.

According to aspects, if a system information request procedure is triggered for a particular subscription of the UE to request system information of a first cell, the UE may first determine whether the system information of the first cell is stored locally in a database associated with another subscription of the UE. If the system information of the first cell is stored locally in the database associated with the other subscription, the UE may retrieve the system information of the first cell from the database associated with the other subscription and forego manually retrieving the system information of the first cell directly from the first cell.

FIG. 5 is a decision flow diagram illustrating example operations for a system information request procedure for a dual SIM UE (e.g., UE 120) , in accordance with certain aspects herein. According to aspects, the dual SIM UE may include a plurality of subscriptions, such as a first subscription (SUB1) and a second subscription (SUB2) . In some cases, the first subscription may be associated with a first set of credentials for accessing a network. The first set of credentials may be stored in a first SIM of the UE. Additionally, in some cases, the second subscription may be associated with a second set of credentials for accessing the network or another network. The second set of credentials may be stored in the first SIM of the UE or in a second SIM of the UE.

As illustrated at 502, the UE may trigger a system information request procedure for the first subscription (SUB1) of the UE to request system information of a first cell associated with a network. The system information request procedure may be triggered in different ways. For example, in some cases, the system information request procedure may be triggered in response to a cell selection or reselection procedure, in response to the UE returning from an out-of-coverage period, after reconfiguration with synchronization completion, after the UE enters the network using a different radio access technology (RAT) , or an expiration timer for system information of the first cell currently being used by the UE expiring.

As illustrated at 504, triggering the system information request procedure for SUB1 may include performing a synchronization procedure with the first cell during which the UE receives synchronization signals from the first cell and becomes time-synchronized with the first cell. Once synchronized with the first cell, the UE may obtain a master information block (MIB) from the first cell based on the synchronization procedure. The MIB may include system information for accessing the first cell, such as at least one of a global synchronization channel number (GSCN) parameter (e.g., GSCN=X) or a physical cell identity (PCI) parameter (e.g., PCI=Y) associated with the first cell.

In some cases, the MIB may provide an indication to the UE whether the UE is barred from accessing the first cell. For example, the UE may receive the MIB from the first cell and may determine whether the UE is barred from accessing the first cell based on a barring indication in the MIB.

As illustrated at 506, if the UE is barred from accessing the first cell, the system information request procedure may proceed to 518, ending the system information request procedure due to the UE being barred from accessing the first cell.

If, at 506, the UE is not barred from accessing the first cell, the system information request procedure proceeds to step 508 where the UE determines whether the triggering of the system information request procedure satisfies one or more criteria. For example, the one or more conditions may comprise one or more of: the system information request procedure being triggered in response to a cell selection or reselection procedure, the system information request procedure being triggered in response to the UE returning from an out-of-coverage period, the system information request procedure being triggered after reconfiguration with synchronization completion, or the system information request procedure is triggered after the UE enters the network using a different radio access technology (RAT) . The one or more conditions may also include the UE not being barred from accessing the first cell, as discussed above.

According to aspects, if at 508 the one or more criteria are not satisfied, the system information request procedure proceeds to 516 with the UE following a normal procedure for obtaining the system information of the first cell. For example, if the one or more criteria are not satisfied, the UE may proceed with sensing and receiving the system information of the first cell directly from the first cell (e.g., over the air) . In some cases, if the first cell is not broadcasting the system information (e.g., si-BroadcastStatus is notBroadcasting) , the UE may generate and transmit a request to the first cell that requests the system information of the first cell. The first cell may receive the request from the UE and may transmit the system information to the UE based on the request. Additionally, in some cases, the UE may be configured to perform the normal procedure to obtain the system information of the first cell from the first cell if, for example, the UE receives an indication that the system information of the first cell has changed or the UE receives a public warning system (PWS) notification.

If, however, at 508 the one or more criteria are satisfied, the UE may detect, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE, as illustrated at 510. For example, in some cases, detecting whether the system information of the first cell is stored at the UE in the database associated with the second subscription of the UE may include searching the database associated with the second subscription using at least one of the GSCN parameter or the PCI parameter. For example, as illustrated at 510, the first subscription (SUB1) may transmit a query to the second subscription (SUB2) for the system information of the first cell. In some cases, the query may include identification information for the first cell, such as the GSCN parameter or the PCI parameter. Based on at least one of the GSCN parameter or the PCI parameter, the UE may determine whether the system information of the first cell is stored at the UE in the database associated with the second subscription.

As illustrated at 512, if the system information of the first cell is not stored at the UE in the database associated with the second subscription, the system information request procedure may proceed to 516 with the UE performing the normal procedure for obtaining the system information of the first cell from the first cell, as discussed above.

However, if at 512, if the system information of the first cell is stored at the UE in the database associated with the second subscription, the UE (or first subscription of the UE) may retrieve the system information of the first cell from the database associated with second subscription at 514. According to aspects, retrieving the system information of the first cell from the database associated with second subscription may also be based on the one or more conditions being satisfied, as illustrated at 508. It should be noted that, in some cases, the UE may perform the determination of whether the one or more conditions are satisfied after detecting that the system information of the first cell is stored at the UE in the database associated with second subscription. In either case, retrieving the system information of the first cell from the database associated with second subscription may be based on the one or more conditions being satisfied. According to aspects, retrieving the system information of the first cell from the database associated with the second subscription may further include storing the retrieved system information of the first cell in another database associated with the first subscription.

In addition to the one or more conditions discussed above, the one or more conditions may further include an age associated with the retrieved system information of the first cell being less than a threshold age (e.g., 3 hours) . For example, when detecting/retrieving the system information of the first cell from the database associated with the second subscription, the UE may check an age of the system information of the first cell. According to aspects, if the age of the system information of the first cell stored in the database associated with the second cell is greater than the threshold age, the system information request procedure may proceed to 516 with the UE obtaining the system information of the first cell using a normal procedure, as discussed above.

In some cases, the UE may decide whether or not to receive the system information of the first cell from the database associated with the second subscription if a remaining validity time associated with the system information of the first cell is greater than a second threshold. For example, if the UE determines that the remaining validity time of the system information of the first cell is greater than X threshold, the UE may determine to retrieve the system information of the first cell from the database associated with the second subscription. Such determination of the remaining validity time being greater than a threshold may allow the UE to not waste time and resources retrieving the system information of the first cell from the database associated with the second subscription if, for example, by the time the system information of the first cell is retrieves, the system information of the first cell would no longer be valid. Accordingly, if the remaining validity time of the system information of the first cell stored in the database associated with the second cell is not greater than the second threshold, the system information request procedure may proceed to 516 with the UE obtaining the system information of the first cell using a normal procedure, as discussed above.

Additionally, when detecting/retrieving the system information of the first cell from the database associated with the second subscription, the UE may check a version associated with the system information of the first cell. According to aspects, if the version of the system information of the first cell stored in the database associated with the second cell is not valid (e.g., the system information is not valid) , the system information request procedure may proceed to 516 with the UE obtaining the system information of the first cell using a normal procedure, as discussed above.

Thereafter, as illustrated at 518, after retrieving the system information of the first cell from the database associated with the second subscription, the system information request procedure is completed and the UE may begin communicating with the first cell using the first subscription based on the retrieved system information of the first cell retrieved at 514 or based on the system information of the first cell obtained at from the first cell at 516. In some cases, communicating with the first cell using the first subscription based on the retrieved system information of the first cell may be based on a remaining validity time associated with the retrieved system information of the first cell. For example, in some cases, the UE may determine the remaining validity time associated with the retrieved system information of the first cell and communicate with the first cell using the first subscription based on the remaining validity time. According to aspects, in some cases, the UE may determine the remaining validity time based on at least one of a current time or a time at which the system information of the first cell was stored in the database associated with the second subscription. For example, in some cases, the UE may determine the remaining validity time by comparing the current time with the time at which the system information of the first cell was stored in the database associated with the second subscription. If the difference between the current time and the time at which the system information of the first cell was stored in the database associated with the second subscription is less than the threshold age, the UE may communicate with the first cell using the first subscription based on the remaining validity time.

FIG. 6 illustrates a communications device 600 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIGs. 4-5. The communications device 600 includes a processing system 602 coupled to a transceiver 608 (e.g., a transmitter and/or a receiver) . The transceiver 608 is configured to transmit and receive signals for the communications device 600 via an antenna 610, such as the various signals as described herein. The processing system 602 may be configured to perform processing functions for the communications device 600, including processing signals received and/or to be transmitted by the communications device 600.

The processing system 602 includes a processor 604 coupled to a computer-readable medium/memory 612 via a bus 606. In certain aspects, the computer-readable medium/memory 612 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 604, cause the processor 604 to perform the operations illustrated in FIGs. 4-5, or other operations for performing the various techniques discussed herein for sharing system information in dual subscriber identity module (SIM) devices. In certain aspects, computer-readable medium/memory 612 stores code 614 for triggering a system information request procedure for a first subscription of the UE to request system information of a first cell associated with a network; code 616 for detecting, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and code 618 for communicating with the first cell using the first subscription based on the detection.

Additionally, as illustrated, the computer-readable medium/memory 612 may also store code 620 for retrieving the system information of the first cell from the database associated with the second subscription.

Additionally, as illustrated, the computer-readable medium/memory 612 may also store code 622 for obtaining, from the first cell, the system information of the first cell.

Additionally, as illustrated, the computer-readable medium/memory 612 may also store code 624 for performing a synchronization procedure with the first cell.

Additionally, as illustrated, the computer-readable medium/memory 612 may also store code 626 for obtaining a master information block (MIB) from the first cell based on the synchronization procedure.

Additionally, as illustrated, the computer-readable medium/memory 612 may also store code 628 for searching the databased associated with the second subscription using at least one of a GSCN parameter or a PCI parameter.

Additionally, as illustrated, the computer-readable medium/memory 612 may also store code 630 for storing the retrieved system information of the first cell in another database associated with the first subscription.

Additionally, as illustrated, the computer-readable medium/memory 612 may also store code 632 for determining a remaining validity time associated with the system information of the first cell.

In certain aspects, the processor 604 includes circuitry 634 for triggering a system information request procedure for a first subscription of the UE to request system information of a first cell associated with a network; circuitry 636 for detecting, in response to triggering the system information request procedure, whether the system information of the first cell is stored locally in a database associated with a second subscription of the UE; and circuitry 638 for communicating with the first cell using the first subscription based on the retrieved system information of the first cell.

Additionally, as illustrated, the processor 604 may also include circuitry 640 for retrieving the system information of the first cell from the database associated with the second subscription.

Additionally, as illustrated, the processor 604 may also include circuitry 642 for obtaining, from the first cell, the system information of the first cell.

Additionally, as illustrated, the processor 604 may also include circuitry 644 for performing a synchronization procedure with the first cell.

Additionally, as illustrated, the processor 604 may also include circuitry 646 for obtaining a master information block (MIB) from the first cell based on the synchronization procedure.

Additionally, as illustrated, the processor 604 may also include circuitry 648 for searching the databased associated with the second subscription using at least one of a GSCN parameter or a PCI parameter.

Additionally, as illustrated, the processor 604 may also include circuitry 650 for storing the retrieved system information of the first cell in another database associated with the first subscription.

Additionally, as illustrated, the processor 604 may also include circuitry 652 for determining a remaining validity time associated with the system information of the first cell.

The techniques described herein may be used for various wireless communication technologies, such as NR (e.g., 5G NR) , 3GPP Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal frequency division multiple access (OFDMA) , single-carrier frequency division multiple access (SC-FDMA) , time division synchronous code division multiple access (TD-SCDMA) , and other networks. The terms “network” and “system” are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) . An OFDMA network may implement a radio technology such as NR (e.g. 5G RA) , Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) . LTE and LTE-Aare releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) . cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) . NR is an emerging wireless communications technology under development.

In 3GPP, the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used. In NR systems, the term “cell” and BS, next generation NodeB (gNB or gNodeB) , access point (AP) , distributed unit (DU) , carrier, or transmission reception point (TRP) may be used interchangeably. A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) . A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS.A BS for a femto cell may be referred to as a femto BS or a home BS.

A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc. ) , an entertainment device (e.g., a music device, a video device, a satellite radio, etc. ) , a vehicular component or sensor, a smart meter/sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium. Some UEs may be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device) , or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

In some examples, access to the air interface may be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity. Base stations are not the only entities that may function as a scheduling entity. In some examples, a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs) , and the other UEs may utilize the resources scheduled by the UE for wireless communication. In some examples, a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may communicate directly with one another in addition to communicating with a scheduling entity.

The methods disclosed herein comprise one or more steps or actions for achieving the methods. 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.

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) .

As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language of the claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” Unless specifically stated otherwise, the term “some” refers to one or more. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. §112 (f) unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for. ”

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 with similar numbering.

The various illustrative logical blocks, modules and circuits described in connection with the present disclosure may be implemented or performed with a general purpose 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 designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

If implemented in hardware, an example hardware configuration may comprise a processing system in a wireless node. The processing system may be implemented with a bus architecture. The bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints. The bus may link together various circuits including a processor, machine-readable media, and a bus interface. The bus interface may be used to connect a network adapter, among other things, to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the case of a user terminal (see FIG. 1) , a user interface (e.g., keypad, display, mouse, joystick, etc. ) may also be connected to the bus. The bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further. The processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.

If implemented in software, the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium. Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. The processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media. A computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. By way of example, the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface. Alternatively, or in addition, the machine- readable media, or any portion thereof, may be integrated into the processor, such as the case may be with cache and/or general register files. Examples of machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof. The machine-readable media may be embodied in a computer-program product.

A software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media. The computer-readable media may comprise a number of software modules. The software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions. The software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices. By way of example, a software module may be loaded into RAM from a hard drive when a triggering event occurs. During execution of the software module, the processor may load some of the instructions into cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.

Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and

disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Thus, in some aspects computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) . In addition, for other aspects computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.

Thus, certain aspects may comprise a computer program product for performing the operations presented herein. For example, such a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, instructions for performing the operations described herein and illustrated in FIG. 4 and/or FIG. 5.

Further, it should be appreciated that modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable. For example, such a device can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device. Moreover, any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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

An apparatus for wireless communications by a user equipment (UE) , comprising:

a processing system configured to:

trigger a request procedure for a first subscription of the UE to request system information of a first cell associated with a network;

detect, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and

communicate with the first cell using the first subscription based on the detection.
The apparatus of claim 1, wherein the processing system is further configured to:

retrieve the system information of the first cell from the database associated with the second subscription based on:

detecting that the system information of the first cell is stored in the database associated with the second subscription; and

one or more conditions being satisfied; and

communicate with the first cell using the first subscription based on the retrieved system information of the first cell.
The apparatus of claim 2, wherein the one or more conditions comprise:

the system information request procedure is triggered in response to a cell selection or reselection procedure;

the system information request procedure is triggered in response to the UE returning from an out-of-coverage period;

the system information request procedure is triggered after reconfiguration with synchronization completion; or

the system information request procedure is triggered after the UE enters the network using a different radio access technology (RAT) .
The apparatus of claim 2, the one or more conditions comprise an age associated with the retrieved system information of the first cell being less than a threshold age.
The apparatus of claim 2, wherein the one or more conditions comprise the apparatus not being barred from accessing the first cell.
The apparatus of claim 1, wherein the processing system is further configured to obtain, from the first cell, the system information of the first cell based on:

detecting that the system information of the first cell is not stored at the UE in the database associated with the second subscription; or

one or more conditions are not being satisfied.
The apparatus of claim 1, wherein the processing system is further configured to obtain, from the first cell, the system information of the first cell in response to at least one of:

the processing system received an indication that the system information of the first cell has changed;

the processing system received a public warning system (PWS) notification; or

the retrieved system information of the first cell stored in the database associated with the second subscription is not valid.
The apparatus of claim 1, wherein the processing system is further configured to:

perform, in response to triggering the system information request procedure, a synchronization procedure with the first cell; and

obtain a master information block (MIB) from the first cell based on the synchronization procedure.
The apparatus of claim 8, wherein the MIB includes at least one of a global synchronization channel number (GSCN) parameter or a physical cell identity (PCI) parameter associated with the first cell.
The apparatus of claim 9, wherein the processing system is further configured to detect by searching the database associated with the second subscription using at least one of the GSCN parameter or the PCI parameter.
The apparatus of claim 1, wherein the processing system is further configured to store the retrieved system information of the first cell in another database associated with the first subscription.
The apparatus of claim 1, wherein the processing system is further configured to:

determine a remaining validity time associated with the retrieved system information of the first cell; and

communicate with the first cell using the first subscription based on the remaining validity time.
The apparatus of claim 12, wherein the processing system determines the remaining validity time based on at least one of a current time or a time at which the system information of the first cell was stored in the database associated with the second subscription.
The apparatus of claim 1, wherein:

the first subscription corresponds to a first set of credentials stored in a first subscriber identity module (SIM) of the UE; and

the second subscription corresponds to a second set of credentials stored in one of the first SIM of the UE or a second SIM of the UE.
A method for wireless communications by a user equipment (UE) , comprising:

triggering a request procedure for a first subscription of the UE to request system information of a first cell associated with a network;

detecting, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and

communicating with the first cell using the first subscription based on the detection.
The method of claim 15, further comprising:

retrieving the system information of the first cell from the database associated with the second subscription based on:

detecting that the system information of the first cell is stored in the database associated with the second subscription; and

one or more conditions being satisfied; and

communicating with the first cell using the first subscription based on the retrieved system information of the first cell.
The method of claim 16, wherein the one or more conditions comprise:

the system information request procedure is triggered in response to a cell selection or reselection procedure;

the system information request procedure is triggered in response to the UE returning from an out-of-coverage period;

the system information request procedure is triggered after reconfiguration with synchronization completion; or

the system information request procedure is triggered after the UE enters the network using a different radio access technology (RAT) .
The method of claim 16, the one or more conditions comprise an age associated with the retrieved system information of the first cell being less than a threshold age.
The method of claim 16, wherein the one or more conditions comprise the UE not being barred from accessing the first cell.
The method of claim 15, further comprising obtaining, from the first cell, the system information of the first cell based on:

detecting that the system information of the first cell is not stored at the UE in the database associated with the second subscription; or

one or more conditions are not being satisfied.
The method of claim 15, further comprising obtaining, from the first cell, the system information of the first cell in response to at least one of:

receiving an indication that the system information of the first cell has changed;

receiving a public warning system (PWS) notification; or

the retrieved system information of the first cell stored in the database associated with the second subscription is not valid.
The method of claim 15, further comprising:

performing, in response to triggering the system information request procedure, a synchronization procedure with the first cell; and

obtaining a master information block (MIB) from the first cell based on the synchronization procedure.
The method of claim 22, wherein the MIB includes at least one of a global synchronization channel number (GSCN) parameter or a physical cell identity (PCI) parameter associated with the first cell.
The method of claim 23, wherein the detection comprises searching the database associated with the second subscription using at least one of the GSCN parameter or the PCI parameter.
The method of claim 15, further comprising storing the retrieved system information of the first cell in another database associated with the first subscription.
The method of claim 15, further comprising:

determining a remaining validity time associated with the retrieved system information of the first cell; and

communicating with the first cell using the first subscription based on the remaining validity time.
The method of claim 26, wherein the determination of the remaining validity time is based on at least one of a current time or a time at which the system information of the first cell was stored in the database associated with the second subscription.
The method of claim 15, wherein:

the first subscription corresponds to a first set of credentials stored in a first subscriber identity module (SIM) of the UE; and

the second subscription corresponds to a second set of credentials stored in one of the first SIM of the UE or a second SIM of the UE.
An apparatus for wireless communications by a user equipment (UE) , comprising:

means for triggering a request procedure for a first subscription of the UE to request system information of a first cell associated with a network;

means for detecting, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and

means for communicating with the first cell using the first subscription based on the detection.
The apparatus of claim 29, further comprising:

means for retrieving the system information of the first cell from the database associated with the second subscription based on:

detecting that the system information of the first cell is stored in the database associated with the second subscription; and

one or more conditions being satisfied; and

means for communicating with the first cell using the first subscription based on the retrieved system information of the first cell.
The apparatus of claim 30, wherein the one or more conditions comprise:

the system information request procedure is triggered in response to a cell selection or reselection procedure;

the system information request procedure is triggered in response to the UE returning from an out-of-coverage period;

the system information request procedure is triggered after reconfiguration with synchronization completion; or

the system information request procedure is triggered after the UE enters the network using a different radio access technology (RAT) .
The apparatus of claim 30, the one or more conditions comprise an age associated with the retrieved system information of the first cell being less than a threshold age.
The apparatus of claim 30, wherein the one or more conditions comprise the UE not being barred from accessing the first cell.
The apparatus of claim 29, further comprising means for obtaining, from the first cell, the system information of the first cell based on:

detecting that the system information of the first cell is not stored at the UE in the database associated with the second subscription; or

one or more conditions are not being satisfied.
The apparatus of claim 29, further comprising means for obtaining, from the first cell, the system information of the first cell in response to at least one of:

the apparatus received an indication that the system information of the first cell has changed;

the apparatus received a public warning system (PWS) notification; or

the retrieved system information of the first cell stored in the database associated with the second subscription is not valid.
The apparatus of claim 29, further comprising:

means for performing, in response to triggering the system information request procedure, a synchronization procedure with the first cell; and

means for obtaining a master information block (MIB) from the first cell based on the synchronization procedure.
The apparatus of claim 36, wherein the MIB includes at least one of a global synchronization channel number (GSCN) parameter or a physical cell identity (PCI) parameter associated with the first cell.
The apparatus of claim 37, wherein the means for detecting comprises means for searching the database associated with the second subscription using at least one of the GSCN parameter or the PCI parameter.
The apparatus of claim 29, further comprising means for storing the retrieved system information of the first cell in another database associated with the first subscription.
The apparatus of claim 29, further comprising:

means for determining a remaining validity time associated with the retrieved system information of the first cell; and

means for communicating with the first cell using the first subscription based on the remaining validity time.
The apparatus of claim 40, wherein the means for determining determines the remaining validity time based on at least one of a current time or a time at which the system information of the first cell was stored in the database associated with the second subscription.
The apparatus of claim 29, wherein:

the first subscription corresponds to a first set of credentials stored in a first subscriber identity module (SIM) of the UE; and

the second subscription corresponds to a second set of credentials stored in one of the first SIM of the UE or a second SIM of the UE.
A user equipment (UE) , comprising:

at least one antenna; and

a processing system configured to:

trigger a request procedure for a first subscription of the UE to request system information of a first cell associated with a network;

detect, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and

communicate, via the at least one antenna, with the first cell using the first subscription based on the detection.
A computer-readable medium for wireless communications by a user equipment (UE) , comprising instructions executable to:

trigger a request procedure for a first subscription of the UE to request system information of a first cell associated with a network;

detect, in response to triggering the system information request procedure, whether the system information of the first cell is stored at the UE in a database associated with a second subscription of the UE; and

communicate with the first cell using the first subscription based on the detection.