WO2016004559A1

WO2016004559A1 - Methods and apparatus for accelerating the camp-on procedure in multi-sim devices

Info

Publication number: WO2016004559A1
Application number: PCT/CN2014/080286
Authority: WO
Inventors: Xuepan GUAN; Ta-Yan Siu; Tim Tynghuei Liou; Defang Chen; Haizhou LIU; Xiaofeng BAI; Zhen Zhang; Huan Xu
Original assignee: Qualcomm Incorporated
Priority date: 2014-06-19
Filing date: 2014-06-19
Publication date: 2016-01-14

Abstract

Methods and apparatuses are presented for managing a multi-subscriber identity module (SIM) user equipment (UE) such that a camp-on procedure of one or more subscriptions of the multi-SIM UE may be more quickly implemented. For example, a method is presented that includes receiving, by a first subscription corresponding to a first SIM of the multi-SIM UE, a system information block (SIB) from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell. Additionally, the example method may include selecting from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription of the multi-SIM UE is to camp. Moreover, the example method presented by the present disclosure may include camping the second subscription on the neighbor cell.

Description

METHODS AND APPARATUS FOR ACCELERATING THE

CAMP-ON PROCEDURE IN MULTI-SIM DEVICES

BACKGROUND

[0001] The present disclosure relates to the field of wireless communications, and more particularly to methods and apparatuses for accelerating the camp-on procedure in a multi-subscriber identity module (SIM) user equipment (UE).

[0002] Wireless communication networks are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources. One example of such a network is the UMTS Terrestrial Radio Access Network (UTRAN). The UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP). The UMTS, which is the successor to Global System for Mobile Communications (GSM) technologies, currently supports various air interface standards, such as Wideband- Code Division Multiple Access (WCDMA), Time Division-Code Division Multiple Access (TD-CDMA), and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA). The UMTS also supports enhanced 3G data communications protocols, such as High Speed Packet Access (HSPA), which provides higher data transfer speeds and capacity to associated UMTS networks.

[0003] As the demand for mobile broadband access continues to increase, research and development continue to advance the UMTS technologies not only to meet the growing demand for mobile broadband access, but to advance and enhance the user experience with mobile communications.

[0004] Additionally, some wireless devices are configured to facilitate communication via multiple unique subscriptions, each being associated with a SIM of multiple SIMs present on the device. In other words, multi-SIM devices (e.g., dual-SIM, dual standby (DSDS) and dual-SIM, dual active (DSDA) devices) may include one SIM associated with a first subscription and a second SIM associated with a second subscription. Furthermore, each subscription may be associated with one or more radio access technology (RAT) types. For example, in some multi-SIM devices, one SIM may be associated with a first subscription supporting Time Divisions Multiple Access (TDMA) and GSM and a second SIM associated with a second subscription supporting GSM only. In another example of a multi-SIM device, one SIM may be associated with a first subscription supporting WCDMA and GSM and a second SIM associated with a second subscription supporting GSM only.

[0005] Because of limited resources in multi-SIM devices, methods and apparatuses may be needed to allow for quicker procedures for camping one subscription of a multi-SIM device camp on a cell, for example, after a completion of a call on another subscription of the multi-SIM device.

SUMMARY

[0006] The following presents a simplified summary of one or more aspects of the disclosure in-order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0007] The present disclosure describes example methods and apparatuses for accelerating the camp-on procedure in a multi-SIM user equipment (UE). For example, the disclosure presents an example method of managing a multi-SIM UE, which may receiving, by a first subscription corresponding to a first SIM of the multi-SIM UE, a system information block (SIB) from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell. Moreover, the example method may include selecting from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp, and camping the second subscription on the target cell.

[0008] In an additional aspect, the present disclosure presents an example apparatus that may include a communications component configured to receive, by a first subscription corresponding to a first SIM of the multi-SIM UE, a SIB from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell. Furthermore, the example apparatus may include a target cell selecting component configured to select, from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp. Additionally, the example apparatus may include a cell camping component configured to camp the second subscription on the target cell.

[0009] In yet another aspect, the present disclosure presents an apparatus that may include means for receiving, by a first subscription corresponding to a first SIM of the multi- SIM UE, a SIB from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell. Moreover, the example apparatus may include means for selecting, from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp. In addition, the example apparatus may include means for camping the second subscription on the target cell.

[0010] In an additional aspect, the present disclosure presents a non-transitory computer- readable storage medium that may include instructions, that when executed by a processor, cause the processor to receive, by a first subscription corresponding to a first SIM of the multi-SIM UE, a SIB from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell. Moreover, the instructions may cause the processor to select from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp and may cause the processor to camp the second subscription on the target cell.

[0011] To the accomplishment of the foregoing and related ends, the one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more embodiments. These aspects are indicative, however, of but a few of the various ways in which the principles of various embodiments may be employed and the described embodiments are intended to include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS [0012] FIG. 1 is a block diagram illustrating an example wireless communications system according to the present disclosure;

[0013] FIG. 2 is a block diagram illustrating an example cell selection manager according to an example apparatus of the present disclosure;

[0014] FIG. 3 is a flow diagram comprising a plurality of functional blocks representing an example methodology of the present disclosure;

[0015] FIG. 4 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system;

[0016] FIG. 5 is a block diagram conceptually illustrating an example of a telecommunications system;

[0017] FIG. 6 is a conceptual diagram illustrating an example of an access network; and

[0018] FIG. 7 is a block diagram conceptually illustrating an example of a Node B in communication with a UE in a telecommunications system.

DETAILED DESCRIPTION

[0019] The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

[0020] The present disclosure presents methods and apparatuses for improved cell reestablishment procedures associated with one or more subscriptions of a multi-SIM UE. In an aspect of the present disclosure, a first subscription of the multi-SIM UE may initiate and conduct a call using a shared radio resource of the UE. In an example operational scenario, a multi-SIM device may initiate a call on a first subscription and, during the operation of the call, may handover to several cells in the operator network associated with the first subscription to maintain cellular network access. Because only a single radio resource (e.g., radio, antenna, transceiver, etc.) may exist on the multi-SIM device, that single radio resource may be shared by the first subscription and a second subscription. Thus, as the shared radio resource may be used exclusively by the first subscription during the call, the second subscription of the multi-SIM device is not able to perform cell reselection or other control operations during the ongoing call on the first subscription. Thus, after the call is released on the first subscription, the multi-SIM device must find cells on which both the first subscription and the second subscription should camp. However, because the multi- SIM device has left its original location after starting the call, if the multi-SIM device attempts to camp on the original cell for the second subscription (e.g. the non-call subscription), the multi-SIM device will likely not find it. This may cause the multi- SIM device to perform a full-frequency scan to find the suitable cell on which the second subscription may camp. Such a full frequency scan can involve a relatively lengthy time to completion and can utilize significant radio and power resources in the multi-SIM device that could be utilized for other operations.

[0021] Thus, in an aspect of the present disclosure, upon releasing the call of the first subscription, multi-SIM UE (or a component associated with the multi-SIM UE) may utilize system information (i.e., a Public Land Mobile Network (PLMN) or neighbor cell strength information) received by the first subscription that has just released the call to determine the cell upon which another subscription (e.g. , a second subscription) should camp.

[0022] For example, the multi-SIM UE may initiate a call on the first subscription and may make several cell handovers during the call. During this process, the first subscription may receive system and measurement control information associated with the last cell of its call and neighbor cells for that last cell. After the multi-SIM UE releases the call on the first subscription, the multi-SIM UE may choose a target cell upon which a second subscription is to camp after the call has ended based on the system and measurement control information received on the first subscription. In an aspect, the target cell may be a neighbor cell to the last serving cell of the first subscription during the call or may be the last serving cell itself. This target cell may be chosen, for example, based on the cell having the greatest signal strength or quality as measured by the first subscription. Furthermore, though an example contemplates both the first and second subscriptions supporting GSM as a shared radio access technology, the solution can be utilized for any radio access technology shared between the first and second subscriptions of the multi-SIM UE. [0023] In another solution, the multi-SIM UE may select a cell upon which a first subscription should camp based on PLMN information received by the first subscription in a SIB message. In a multi-SIM UE, each subscription may be associated with a particular operator network, which may have identifying cell or system information (e.g., PLMN identifier) that is included in a SIB (e.g., a SIB1 1 , SIB 12, SIB18, or SIB 19) received by a first subscription during a call or after the device releases the call on the second subscription. For example, the SIB may comprise a SIB1 1 or SIB 12, which may contain cell measurement control information corresponding to the cell transmitting the SIB. Alternatively or additionally, the SIB may comprise a SIB 18, which may contain system information (e.g., a PLMN) associated with the cell transmitting the SIB. From the system information, the multi- SIM UE can determine which cell is associated with the second subscription of the multi-SIM UE and how the particular cell may be acquired. This association may be identified by the PLMN, Home PLMN (HPLMN), Registered PLMN (RPLMN), Equivalent PLMN (EPLMN), Equivalent Home PLMN (EHPLMN), or any other identifier indicating a relationship between the second subscription and a neighbor cell detected by the first subscription, which may be included, for example, in a SIB 18. In some examples, the SIB may comprise a SIB 19, which may include inter- radio access technology (RAT) frequency and/or priority information that may be used by a subscription when attempting to select and/or camp on a cell.

[0024] In other words, a first subscription of the UE may receive the system information (e.g., via the SIB message), extract relevant information associated with a cell or one or more neighbor cells from the SIB (e.g., PLMN and/or cell mapping information), and inform a second subscription of the relevant system information to allow the second subscription to camp on or otherwise acquire a cell based on the system information received by the first subscription. In this way, the multi-SIM UE can choose a cell upon which the second subscription will camp after a call on the first subscription has completed where a pre-call cell associated with the first cell is unavailable after the call.

[0025] Furthermore, in an alternative scenario, the first subscription and the second subscription (or more subscriptions) of the multi-SIM UE may each lose communicative connectivity with their corresponding networks. In an aspect of the present disclosure, when either of the first subscription or the second subscription regains communicative connectivity with a cell of a supported network, that connected subscription may receive system information (e.g., via a SIB message) and may inform the other, non-connected subscription of the system information to allow the second subscription to acquire and obtain connectivity with a supported cell based on the system information. In other words, in an aspect, the first subscription of the multi-SIM device subscriptions to regain connectivity with a supported network cell may receive system information and forward that system information for use by the other subscription(s).

[0026] FIG. 1 is a schematic diagram illustrating a system 100 for wireless communication, according to an example configuration. FIG. 1 includes an example first subscription network entity 104, which may communicate wirelessly with a first subscription 1 16 of one or more UEs 102 over one or more wireless communication channels 108, which may include, in a non-limiting aspect, data communication channels and control channels. In an aspect, the specific first subscription network entity 104 in communication with the UE 102 may change with time and location based on cell handover during a call conducted by the first subscription 1 16 as UE 102 moves geographically. Additionally, FIG. 1 includes an example second subscription network entity 124, which may communicate wirelessly with a second subscription 120 of one or more UEs 102 over one or more wireless communication channels 126, which may include, in a non-limiting aspect, data communication channels, paging channels, paging indicator channels, and control channels. During a call conducted by the first subscription 1 16, communication with second subscription network entity 124 may cease by virtue of the UE 102 moving out of communicative range of a second subscription network entity 124 associated with the second subscription 120

[0027] UE 102 may comprise any type of mobile device, such as, but not limited to, a smartphone, cellular telephone, mobile phone, laptop computer, tablet computer, a device associated with the Internet of Things (IoT), or other portable networked device. In addition, UE 102 may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology. In general, UE 102 may be small and light enough to be considered portable and may be configured to communicate wirelessly via an over-the-air communication link using one or more OTA communication protocols described herein.

[0028] Additionally, in some examples, UE 102 may be configured to facilitate communication on two separate networks via two separate subscriptions, such as, but not limited to, a first subscription 116 and a second subscription 120. As such, UE 102 may comprise a multi-SIM UE (e.g., dual SIM, dual standby (DSDS) UE), which may include two SIM cards - a first SIM card 118 for the first subscription 116 and a second SIM card 122 for the second subscription 120. Furthermore, although only two SIMs and two subscriptions are illustrated in FIG. 1, the UE 102 may contain any number of subscriptions and related SIMs. For example, in some examples, each subscription may facilitate communication via a plurality of radio access technologies (RATs) or may facilitate communication via a single RAT. As such, in a non-limiting example, first subscription 116 may comprise a Time Division Multiple Access (TDM A) and GSM subscription and the second subscription 120 may comprise a GSM-only subscription. However, the specific RAT or RATs supported by a particular subscription may comprise any RAT or RATs known in the art and/or disclosed herein.

[0029] In an aspect, communication channels 108 and 126 may comprise any over-the-air (OTA) communication channel, including, but not limited to, one or more data or control communication channels operating according to specifications promulgated by 3GPP and/or 3GPP2, which may include first generation, second generation (2G), 3G, 4G, etc. wireless network communication protocols.

[0030] Furthermore, UE 102 may include a cell selection manager 106, which may be configured to manage selection of a cell upon which one or both of first subscription 116 and second subscription 120 may camp (e.g., when operating in idle mode) and/or a cell that may facilitate communication during a call associated with first subscription 116 or second subscription 120. Cell selection manager 106 is discussed in detail below in reference to FIG. 2. Furthermore, in an aspect, radio resource 112 may be shared by first subscription 116 and second subscription 120, and may comprise a transceiver, receiver, transmitter, and/or related circuitry for performing wireless communication with first subscription network entity 104 and/or second subscription network entity 124. [0031] Furthermore, first subscription network entity 104 and second subscription network entity 124 of FIG. 1 may comprise one or more of any type of network module, such as an access point, a macro cell, including a base station (BS), node B, eNodeB (eNB), a relay, a peer-to-peer device, an authentication, authorization and accounting (AAA) server, a mobile switching center (MSC), a radio network controller (RNC), or a small cell. As used herein, the term "small cell" may refer to an access point or to a corresponding coverage area of the access point, where the access point in this case has a relatively low transmit power or relatively small coverage as compared to, for example, the transmit power or coverage area of a macro network access point or macro cell. For instance, a macro cell may cover a relatively large geographic area, such as, but not limited to, several kilometers in radius. In contrast, a small cell may cover a relatively small geographic area, such as, but not limited to, a home, a building, or a floor of a building. As such, a small cell may include, but is not limited to, an apparatus such as a base station (BS), an access point, a femto node, a femtocell, a pico node, a micro node, a Node B, evolved Node B (eNB), home Node B (HNB) or home evolved Node B (HeNB). Therefore, the term "small cell," as used herein, refers to a relatively low transmit power and/or a relatively small coverage area cell as compared to a macro cell. Additionally, first subscription network entity 104 may communicate with one or more other network entities of wireless and/or core networks

[0032] Additionally, system 100 may include any network type, such as, but not limited to, wide-area networks (WAN), wireless networks (e.g. 802.11 or cellular network), the Public Switched Telephone Network (PSTN) network, ad hoc networks, personal area networks (e.g. Bluetooth®) or other combinations or permutations of network protocols and network types. Such network(s) may include a single local area network (LAN) or wide-area network (WAN), or combinations of LANs or WANs, such as the Internet. Such networks may comprise a Wideband Code Division Multiple Access (WCDMA) system, and may communicate with one or more UEs 102 according to this standard. As those skilled in the art will readily appreciate, various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures and communication standards. By way of example, various aspects may be extended to other Universal Mobile Telecommunications System (UMTS) systems such as Time Division Synchronous Code Division Multiple Access (TD-SCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), High Speed Packet Access Plus (HSPA+) and Time-Division CDMA (TD-CDMA). Various aspects may also be extended to systems employing Long Term Evolution (LTE) (in FDD, TDD, or both modes), LTE-Advanced (LTE-A) (in FDD, TDD, or both modes), CDMA2000, Evolution-Data Optimized (EV-DO), Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.1 1 (Wi-Fi), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth, and/or other suitable systems. The actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system. The various devices coupled to the network(s) (e.g., UEs 102, first subscription network entity 104, second subscription network entity 124) may be coupled to a core network via one or more wired or wireless connections.

[0033] Turning to FIG. 2, an example cell selection manager 106 (of FIG. 1 , for example) is presented as comprising a plurality of individual components for carrying out the one or more methods or processes described herein. For example, in an aspect, cell selection manager 106 may include a communications component 202, which may be configured to initiate, conduct or perform, and terminate one or more calls, communication sessions, or the like with one or more network entities associated with a first or second subscription of a UE. For example, communications component 202 may be configured to initiate and conduct or perform a call associated with a first subscription corresponding to a first SIM of a UE. In an aspect, such a call may include a packet-switched, circuit-switched, data, voice, messaging, streaming, or any other type of data exchange between the UE of cell selection manager 106 and a network entity with which the UE is in communication. Furthermore, communications component 202 may be configured to receive data packets in the downlink and transmit data packets, measurement reports, packet acknowledgement messages, etc., in the uplink. Furthermore, in an aspect, communications component 202 may include and/or comprise radio resource 1 12 of FIG. 1.

[0034] Moreover, communications component 202 may be configured to receive, by the first subscription or second subscription of the UE, one or more SIBs 204 from a cell upon completion of the call. In an aspect, this cell may be a final cell with which the first subscription was in communication during the call, or, in other words, was the last serving cell of the first subscription during the call. In an alternative or additional aspect, the cell may be any cell with which the first subscription was in communication during the call. Alternatively, in a scenario where each subscription of the UE has lost communicative connectivity with its corresponding network, the cell may be a first cell upon which the any subscription camps or the first cell with which any subscription of the UE otherwise regains communicative connectivity.

[0035] Furthermore, in an aspect, the SIB may include information associated with the cell from which the SIB 204 is received and/or each of one or more neighbor cells of the cell from which the SIB 204 is received. In an aspect, such information of the SIB 204 may include a PLMN 206 of the cell and/or the one or more neighbor cells. In such an example, SIB 204 may comprise a SIB1 1 , SIB 12, SIB18, or SIB19 message, or any other SIB message, transmitted by the cell. In an alternative or additional aspect, the information of the SIB 204 may include information that allows the second subscription to tune to a frequency or channel (e.g., pilot or beacon channel) to monitor or determine a cell strength 208 associated with the cell or associated one or more neighbor cells. For example, the cell strength 208 may include a signal-to- interference ratio (e.g., Ec/Io), received signal code signal power (RSCP), or any other indication of cell signal strength known in the art. In such an example, SIB 204 may comprise a SIB 1 1 and/or a SIB12 message transmitted by the cell. Furthermore, SIB 204 may indicate a radio access technology associated with the cell or each of the one or more neighbor cells.

[0036] In an additional aspect, cell selection manager 106 may include a comparison component 210, which may be configured to perform a comparison of a network identifier of the second subscription and the PLMN 206 received by the cell via communications component 202. For example, the UE may store one or more network identifiers that identify a subscriber-based network or group of networks from which the UE is permitted to receive communication services. In some examples, such network identifiers may include one or more of a PLMN, Home PLMN (HPLMN), a Registered PLMN (RPLMN), an Equivalent PLMN (EPLMN), and an Equivalent Home PLMN (EHPLMN). In an aspect, comparison component 210 may be configured to compare the PLMN 206 to one or more of these network identifiers of the second subscription to determine whether the second subscription may camp on the cell or the one or more neighbor cells.

[0037] In addition, the cell selection manager 106 may include a target cell selecting component 212, which may be configured to select, from the cell (from which the SIB 204 was received) and the one or more neighbor cells identified in the SIB 204, a target cell upon which the second subscription is to camp. In an aspect, the selection of the target cell may be based on a network identifier, the cell strengths 208 of the cell and/or one or more neighbor cells, and/or the radio access technology associated with the cell and/or each of the one or more neighbor cells. The target cell selecting component 212 may be generally configured to select the cell upon which the second cell is to camp once a call on the first subscription is completed and based on the information of the SIB 204. In some examples, the target cell selecting component 212 may be configured to select, as the target cell upon which the second subscription is to camp, the cell having a greatest cell signal strength of the cell strengths 208. Alternatively or additionally, the target cell selecting component 212 may be configured to select, as the target cell upon which the second subscription is to camp, a cell with a radio access technology that matches a radio access technology of the second subscription.

[0038] In an additional aspect, target cell selecting component 212 may be configured to select a target cell based on relative priorities of the cell from which the SIB is received and the one or more neighbor cells. For example, the target cell selecting component 212 may be configured to manage these relative priorities and select the target cell as a cell having the highest priority. In an aspect, target cell selecting component 212 may associate a lower priority to one or more cells that have an associated network identifier (e.g., PLMN) that does not match with the network identifier of the second subscription (e.g. HPLMN, RPLMN, EPLM, and/or EHPLMN). For example, if a neighbor cell of the first subscription is associated with a first operator (i.e. Operator A) and a different, second operator (i.e. Operator B) is preferred by the second subscription, the cell(s) of Operator A may be assigned a lower priority than cell(s) of Operator B by target cell selecting component. As such, when target cell selecting component 212 selects the target cell for reselection of the second subscription, those cells (e.g., of the cell from which the SIB was received and the one or more neighbor cells) associated with Operator B would be selected before the cells associated with Operator A.

[0039] Moreover, in an aspect, cell selection manager 106 may include a cell camping component 214 may be configured to camp the second subscription on the target selected by target cell selecting component 212.

[0040] Through exemplary components 202, 204, 206, 208, 210, 212, and 214 are presented in reference to cell selection manager 106, they are not exclusive. Instead, cell selection manager 106 may include additional or alternative components configured to perform aspects of the present disclosure and the claims recited below.

[0041] FIG. 3 presents an exemplary methodology 300 comprising a non-limiting set of steps represented as blocks that may be performed by an apparatus described herein (e.g. user equipment 102 of FIG. 1 , cell selection manager 106 of FIGS. 1 and 2). In an aspect, methodology 300 may comprise a method of managing a multi-SIM UE, and may include, at block 302, receiving, by the first subscription (e.g., via communications component 202 of FIG. 2), a SIB from a cell. In an aspect, the SIB may include information associated with the cell from which the SIB was received and associated with each of one or more neighbor cells. In an aspect, such information may include, but is not limited to, a PLMN, a cell signal strength , and/or supported RAT(s).

[0042] Furthermore, methodology 300 may include, at block 304, selecting from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp. In an aspect, the selection at block 304 may be based on the information of the SIB, such as a PLMN of the cell and/or each of the one or more neighbor cells, a cell signal strength associated with the cell and/or each of the one or more neighbor cells, and/or a RAT associated with the cell and/or each of the one or more neighbor cells. Furthermore, though not explicitly depicted in FIG. 3, methodology 300 may include performing a comparison (e.g., via comparison component 210 of FIG. 2) of a network identifier of the second subscription and a PLMN of the cell or the one or more neighbor cells received in the SIB at block 304 and selecting the target cell upon which the second subscription is to camp at block 306 based at least in part on the comparison. In an aspect, the network identifier of the second subscription may include, but is not limited to, at least one of an HPLMN, an RPLMN, an EPLMN, and an EHPLMN.

[0043] Furthermore, selecting the target cell at block 306 may include selecting the cell with a greatest neighbor cell signal strength of the signal strengths associated with the cell or the one or more neighbor cells received in a SIB. Alternatively or additionally, selecting the target cell at block 306 may include selecting the target cell as a cell that has a radio access technology that matches a radio access technology of the second subscription. In an additional aspect, methodology 300 may include, at block 306, camping (e.g., via cell camping component 214 of FIG. 2) the second subscription on the target cell.

[0044] FIG. 4 is a conceptual diagram illustrating an example of a hardware implementation for an apparatus 400 employing a processing system 414. In some examples, the processing system 414 may comprise a UE or a component of a UE (e.g., UE 102 of FIG. 1). In this example, the processing system 414 may be implemented with a bus architecture, represented generally by the bus 402. The bus 402 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 414 and the overall design constraints. The bus 402 links together various circuits including one or more processors, represented generally by the processor 404, computer-readable media, represented generally by the computer- readable medium 406, and a cell selection manager 106 (see FIGS. 1 and 2), which may be configured to carry out one or more methods or procedures described herein.

[0045] The bus 402 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further. A bus interface 408 provides an interface between the bus 402 and a transceiver 410. The transceiver 410 provides a means for communicating with various other apparatus over a transmission medium. Depending upon the nature of the apparatus, a user interface 412 (e.g., keypad, display, speaker, microphone, joystick) may also be provided.

[0046] The processor 404 is responsible for managing the bus 402 and general processing, including the execution of software stored on the computer-readable medium 406. The software, when executed by the processor 404, causes the processing system 414 to perform the various functions described infra for any particular apparatus. The computer-readable medium 406 may also be used for storing data that is manipulated by the processor 404 when executing software. Furthermore, in some examples, cell selection manager 106 may be implemented as hardware, software, or a combination of hardware and software in the processing system 414. For example, computer- readable medium 406 may include instructions that, when executed by processor 404, may perform one or more of the aspects of cell selection manager 106 described herein. In addition, the components of cell selection manager 106 presented in FIG. 2 may likewise be implemented as hardware, software, or a combination of hardware and software in the processing system 414.

[0047] The various concepts presented throughout this disclosure may be implemented across a broad variety of telecommunication systems, network architectures, and communication standards. By way of example and without limitation, the aspects of the present disclosure illustrated in FIG. 5 are presented with reference to a UMTS system 500 employing a W-CDMA air interface. A UMTS network includes three interacting domains: a Core Network (CN) 504, a UMTS Terrestrial Radio Access Network (UTRAN) 502, and User Equipment (UE) 510. In this example, the UTRAN 502 provides various wireless services including telephony, video, data, messaging, broadcasts, and/or other services. The UTRAN 502 may include a plurality of Radio Network Subsystems (RNSs) such as an RNS 507, each controlled by a respective Radio Network Controller (RNC) such as an RNC 506. Here, the UTRAN 502 may include any number of RNCs 506 and RNSs 507 in addition to the RNCs 506 and RNSs 507 illustrated herein. The RNC 506 is an apparatus responsible for, among other things, assigning, reconfiguring and releasing radio resources within the RNS 507. The RNC 506 may be interconnected to other RNCs (not shown) in the UTRAN 502 through various types of interfaces such as a direct physical connection, a virtual network, or the like, using any suitable transport network.

[0048] Communication between a UE 510 and a Node B 508 may be considered as including a physical (PHY) layer and a medium access control (MAC) layer. Further, communication between a UE 510 and an RNC 506 by way of a respective Node B 508 may be considered as including a radio resource control (RRC) layer. In the instant specification, the PHY layer may be considered layer 1; the MAC layer may be considered layer 2; and the RRC layer may be considered layer 3. Information hereinbelow utilizes terminology introduced in Radio Resource Control (RRC) Protocol Specification, 3GPP TS 25.331 v9.1.0, incorporated herein by reference. [0049] The geographic region covered by the SRNS 507 may be divided into a number of cells, with a radio transceiver apparatus serving each cell. A radio transceiver apparatus is commonly referred to as a Node B in UMTS applications, but may also be referred to by those skilled in the art as a base station (BS), a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), or some other suitable terminology. For clarity, three Node Bs 508 are shown in each SRNS 507; however, the SRNSs 507 may include any number of wireless Node Bs. The Node Bs 508 provide wireless access points to a core network (CN) 504 for any number of mobile apparatuses. Examples of a mobile apparatus include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a notebook, a netbook, a smartbook, a personal digital assistant (PDA), a satellite radio, a global positioning system (GPS) device, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device. The mobile apparatus is commonly referred to as user equipment (UE) in UMTS applications, but may also be referred to by those skilled in the art as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology. In a UMTS system, the UE 510 may further include a universal subscriber identity module (USIM) 511, which contains a user's subscription information to a network. In an aspect, UE 510 may be a multi-SIM device and may include a cell selection manager 106 as described in relation to FIGS. 1 and 2, above. For illustrative purposes, one UE 510 is shown in communication with a number of the Node Bs 508. The downlink (DL), also called the forward link, refers to the communication link from a Node B 508 to a UE 510, and the uplink (UL), also called the reverse link, refers to the communication link from a UE 510 to a Node B 508.

[0050] The core network 504 interfaces with one or more access networks, such as the UTRAN 502. As shown, the core network 504 is a GSM core network. However, as those skilled in the art will recognize, the various concepts presented throughout this disclosure may be implemented in a RAN, or other suitable access network, to provide UEs with access to types of core networks other than GSM networks.

[0051] The core network 504 includes a circuit-switched (CS) domain and a packet-switched (PS) domain. Some of the circuit-switched elements are a Mobile services Switching Centre (MSC), a Visitor location register (VLR) and a Gateway MSC. Packet- switched elements include a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN). Some network elements, like EIR, HLR, VLR and AuC may be shared by both of the circuit-switched and packet-switched domains. In the illustrated example, the core network 504 supports circuit-switched services with an MSC 512 and a GMSC 514. In some applications, the GMSC 514 may be referred to as a media gateway (MGW). One or more RNCs, such as the RNC 506, may be connected to the MSC 512. The MSC 512 is an apparatus that controls call setup, call routing, and UE mobility functions. The MSC 512 also includes a visitor location register (VLR) that contains subscriber-related information for the duration that a UE is in the coverage area of the MSC 512. The GMSC 514 provides a gateway through the MSC 512 for the UE to access a circuit-switched network 516. The core network 504 includes a home location register (HLR) 515 containing subscriber data, such as the data reflecting the details of the services to which a particular user has subscribed. The HLR is also associated with an authentication center (AuC) that contains subscriber-specific authentication data. When a call is received for a particular UE, the GMSC 514 queries the HLR 515 to determine the UE's location and forwards the call to the particular MSC serving that location.

[0052] The core network 504 also supports packet-data services with a serving GPRS support node (SGSN) 518 and a gateway GPRS support node (GGSN) 520. GPRS, which stands for General Packet Radio Service, is designed to provide packet-data services at speeds higher than those available with standard circuit-switched data services. The GGSN 520 provides a connection for the UTRAN 502 to a packet-based network 522. The packet-based network 522 may be the Internet, a private data network, or some other suitable packet-based network. The primary function of the GGSN 520 is to provide the UEs 510 with packet-based network connectivity. Data packets may be transferred between the GGSN 520 and the UEs 510 through the SGSN 518, which performs primarily the same functions in the packet-based domain as the MSC 512 performs in the circuit-switched domain. [0053] The UMTS air interface is a spread spectrum Direct-Sequence Code Division Multiple Access (DS-CDMA) system. The spread spectrum DS-CDMA spreads user data through multiplication by a sequence of pseudorandom bits called chips. The W- CDMA air interface for UMTS is based on such direct sequence spread spectrum technology and additionally calls for a frequency division duplexing (FDD). FDD uses a different carrier frequency for the uplink (UL) and downlink (DL) between a Node B 508 and a UE 510. Another air interface for UMTS that utilizes DS-CDMA, and uses time division duplexing, is the TD-SCDMA air interface. Those skilled in the art will recognize that although various examples described herein may refer to a WCDMA air interface, the underlying principles are equally applicable to a TD- SCDMA air interface.

[0054] Referring to FIG. 6, an access network 600 in a UTRAN architecture is illustrated. In an example aspect, the UTRAN architecture may be associated with a network of a primary and/or secondary subscription of UE 102 where UE 102 comprises a multi- SIM device. The multiple access wireless communication system includes multiple cellular regions (cells), including cells 602, 604, and 606, each of which may include one or more sectors. The multiple sectors can be formed by groups of antennas with each antenna responsible for communication with UEs in a portion of the cell. For example, in cell 602, antenna groups 612, 614, and 616 may each correspond to a different sector. In cell 604, antenna groups 618, 620, and 622 each correspond to a different sector. In cell 606, antenna groups 624, 626, and 628 each correspond to a different sector. The cells 602, 604 and 606 may include several wireless communication devices, e.g., User Equipment or UEs, which may be in communication with one or more sectors of each cell 602, 604 or 606. For example, UEs 630 and 632 may be in communication with Node B 642, UEs 634 and 636 may be in communication with Node B 644, and UEs 638 and 640 (which may represent UE 102 of FIG. 1) can be in communication with Node B 646. Here, each Node B 642, 644, 646 is configured to provide an access point to a core network 204 (see FIG. 2) for all the UEs 630, 632, 634, 636, 638, 640 in the respective cells 602, 604, and 606. In an aspect, each of the UEs presented in FIG. 6 may comprise UE 102 of FIG. 1 and may include a cell selection manager 106 of FIGS. 1 and 2.

[0055] As the UE 634 moves from the illustrated location in cell 604 into cell 606, a serving cell change (SCC) or handover may occur in which communication with the UE 634 transitions from the cell 604, which may be referred to as the source cell, to cell 606, which may be referred to as the target cell. Management of the handover procedure may take place at the UE 634, at the Node Bs corresponding to the respective cells, at a radio network controller 506 (see FIG. 5), or at another suitable node in the wireless network. For example, during a call with the source cell 604, or at any other time, the UE 634 may monitor various parameters of the source cell 604 as well as various parameters of neighboring cells such as cells 606 and 602. Further, depending on the quality of these parameters, the UE 634 may maintain communication with one or more of the neighboring cells. During this time, the UE 634 may maintain an Active Set, that is, a list of cells that the UE 634 is simultaneously connected to (i.e., the UTRA cells that are currently assigning a downlink dedicated physical channel DPCH or fractional downlink dedicated physical channel F-DPCH to the UE 634 may constitute the Active Set).

[0056] The modulation and multiple access scheme employed by the access network 600 may vary depending on the particular telecommunications standard being deployed. By way of example, the standard may include Evolution-Data Optimized (EV-DO) or Ultra Mobile Broadband (UMB). EV-DO and UMB are air interface standards promulgated by the 6rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards and employs CDMA to provide broadband Internet access to mobile stations. The standard may alternately be Universal Terrestrial Radio Access (UTRA) employing Wideband-CDMA (W-CDMA) and other variants of CDMA, such as TD-SCDMA; Global System for Mobile Communications (GSM) employing TDMA; and Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDM employing OFDMA. UTRA, E-UTRA, UMTS, LTE, LTE Advanced, and GSM are described in documents from the 6GPP organization. CDMA2000 and UMB are described in documents from the 6GPP2 organization. The actual wireless communication standard and the multiple access technology employed will depend on the specific application and the overall design constraints imposed on the system.

[0057] FIG. 7 is a block diagram of a Node B 710 in communication with a UE 750, where the Node B 710 may be the first subscription network entity 104 in FIG. 1, and the UE 750 may be the UE 102 of FIG. 1. For example, UE 750 may be a multi-SIM device and may include cell selection manager 106 and may be configured to perform the functions associated with cell selection manager 106 presented throughout the present disclosure. In the downlink communication, a transmit processor 720 may receive data from a data source 712 and control signals from a controller/processor 740. The transmit processor 720 provides various signal processing functions for the data and control signals, as well as reference signals (e.g., pilot signals). For example, the transmit processor 720 may provide cyclic redundancy check (CRC) codes for error detection, coding and interleaving to facilitate forward error correction (FEC), mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM), and the like), spreading with orthogonal variable spreading factors (OVSF), and multiplying with scrambling codes to produce a series of symbols. Channel estimates from a channel processor 744 may be used by a controller/processor 740 to determine the coding, modulation, spreading, and/or scrambling schemes for the transmit processor 720. These channel estimates may be derived from a reference signal transmitted by the UE 750 or from feedback from the UE 750. The symbols generated by the transmit processor 720 are provided to a transmit frame processor 730 to create a frame structure. The transmit frame processor 730 creates this frame structure by multiplexing the symbols with information from the controller/processor 740, resulting in a series of frames. The frames are then provided to a transmitter 732, which provides various signal conditioning functions including amplifying, filtering, and modulating the frames onto a carrier for downlink transmission over the wireless medium through antenna 734. The antenna 734 may include one or more antennas, for example, including beam steering bidirectional adaptive antenna arrays or other similar beam technologies.

At the UE 750, a receiver 754 receives the downlink transmission through an antenna 752 and processes the transmission to recover the information modulated onto the carrier. The information recovered by the receiver 754 is provided to a receive frame processor 760, which parses each frame, and provides information from the frames to a channel processor 794 and the data, control, and reference signals to a receive processor 770. The receive processor 770 then performs the inverse of the processing performed by the transmit processor 720 in the Node B 710. More specifically, the receive processor 770 descrambles and despreads the symbols, and then determines the most likely signal constellation points transmitted by the Node B 710 based on the modulation scheme. These soft decisions may be based on channel estimates computed by the channel processor 794. The soft decisions are then decoded and deinterleaved to recover the data, control, and reference signals. The CRC codes are then checked to determine whether the frames were successfully decoded. The data carried by the successfully decoded frames will then be provided to a data sink 772, which represents applications running in the UE 750 and/or various user interfaces (e.g., display). Control signals carried by successfully decoded frames will be provided to a controller/processor 790. When frames are unsuccessfully decoded by the receiver processor 770, the controller/processor 790 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.

[0059] In the uplink, data from a data source 778 and control signals from the controller/processor 790 are provided to a transmit processor 780. The data source 778 may represent applications running in the UE 750 and various user interfaces (e.g., keyboard). Similar to the functionality described in connection with the downlink transmission by the Node B 710, the transmit processor 780 provides various signal processing functions including CRC codes, coding and interleaving to facilitate FEC, mapping to signal constellations, spreading with OVSFs, and scrambling to produce a series of symbols. Channel estimates, derived by the channel processor 794 from a reference signal transmitted by the Node B 710 or from feedback contained in the midamble transmitted by the Node B 710, may be used to select the appropriate coding, modulation, spreading, and/or scrambling schemes. The symbols produced by the transmit processor 780 will be provided to a transmit frame processor 782 to create a frame structure. The transmit frame processor 782 creates this frame structure by multiplexing the symbols with information from the controller/processor 790, resulting in a series of frames. The frames are then provided to a transmitter 756, which provides various signal conditioning functions including amplification, filtering, and modulating the frames onto a carrier for uplink transmission over the wireless medium through the antenna 752.

[0060] The uplink transmission is processed at the Node B 710 in a manner similar to that described in connection with the receiver function at the UE 750. A receiver 735 receives the uplink transmission through the antenna 734 and processes the transmission to recover the information modulated onto the carrier. The information recovered by the receiver 735 is provided to a receive frame processor 736, which parses each frame, and provides information from the frames to the channel processor 744 and the data, control, and reference signals to a receive processor 738. The receive processor 738 performs the inverse of the processing performed by the transmit processor 780 in the UE 750. The data and control signals carried by the successfully decoded frames may then be provided to a data sink 739 and the controller/processor, respectively. If some of the frames were unsuccessfully decoded by the receive processor, the controller/processor 740 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.

[0061] The controller/processors 740 and 790 may be used to direct the operation at the Node B 710 and the UE 750, respectively. For example, the controller/processors 740 and 790 may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The computer readable media of memories 742 and 792 may store data and software for the Node B 710 and the UE 750, respectively. A scheduler/processor 746 at the Node B 710 may be used to allocate resources to the UEs and schedule downlink and/or uplink transmissions for the UEs.

[0062] Several aspects of a telecommunications system have been presented with reference to an HSPA system. As those skilled in the art will readily appreciate, various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures and communication standards.

[0063] By way of example, various aspects may be extended to other UMTS systems such as W-CDMA, TD-SCDMA, High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), High Speed Packet Access Plus (HSPA+) and TD-CDMA. Various aspects may also be extended to systems employing Long Term Evolution (LTE) (in FDD, TDD, or both modes), LTE-Advanced (LTE-A) (in FDD, TDD, or both modes), CDMA2000, Evolution-Data Optimized (EV-DO), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth, and/or other suitable systems. The actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.

In accordance with various aspects of the disclosure, an element, or any portion of an element, or any combination of elements may be implemented with a "processing system" that includes one or more processors. Examples of processors include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. The software may reside on a computer-readable medium. The computer-readable medium may be a non-transitory computer-readable medium. A non-transitory computer-readable medium includes, by way of example, a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., compact disk (CD), digital versatile disk (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), random access memory (RAM), read only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), a register, a removable disk, and any other suitable medium for storing software and/or instructions that may be accessed and read by a computer. The computer-readable medium may also include, by way of example, a carrier wave, a transmission line, and any other suitable medium for transmitting software and/or instructions that may be accessed and read by a computer. The computer-readable medium may be resident in the processing system, external to the processing system, or distributed across multiple entities including the processing system. The computer-readable medium may be embodied in a computer-program product. By way of example, a computer- program product may include a computer-readable medium in packaging materials. Those skilled in the art will recognize how best to implement the described functionality presented throughout this disclosure depending on the particular application and the overall design constraints imposed on the overall system.

[0065] It is to be understood that the specific order or hierarchy of steps in the methods disclosed is an illustration of exemplary processes. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the methods or methodologies described herein may be rearranged. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented unless specifically recited therein.

[0066] 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. 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 and b; a and c; b and c; and a, b and c. 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, sixth paragraph, 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."

Claims

CLAIMS We claim:

1. A method of managing a multi-subscriber identity module (SIM) user equipment (UE), comprising:

receiving, by a first subscription corresponding to a first SIM of the multi-SIM UE, a system information block (SIB) from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell; selecting from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp; and

camping the second subscription on the target cell.

2. The method of claim 1, wherein the SIB comprises a SIB 18 message and the information included in the SIB comprises a public land mobile network (PLMN) associated with the cell and each of the one or more neighbor cells of the cell; and wherein selecting the target cell comprises selecting one of the cell and the one or more neighbor cells having an associated PLMN corresponding to a PLMN of the second subscription.

3. The method of claim 1, further comprising:

performing a comparison of a network identifier of the second subscription and the PLMN; and

selecting the target cell based at least in part on the comparison.

4. The method of claim 3, wherein the network identifier comprises at least one of a Home PLMN (HPLMN), a Registered PLMN (RPLMN), an Equivalent PLMN (EPLMN), and a Equivalent Home PLMN (EHPLMN) of the second subscription.

5. The method of claim 1, further comprising: determining a signal strength associated with each of the cell and the one or more neighbor cells; and

wherein selecting the target cell comprises selecting the target cell based on the signal strength.

6. The method of claim 5, wherein selecting the target cell comprises selecting the target cell as a strongest cell of the cell and the one or more neighbor cells, wherein the strongest cell has a greatest cell strength of the cell and the one or more neighbor cells.

7. The method of claim 1, wherein the information included in the SIB comprises a radio access technology associated with the cell and each of the one or more neighbor cells, and wherein selecting the target cell upon which the second subscription is to camp comprises selecting the target cell with a radio access technology that matches a radio access technology of the second subscription.

8. The method of claim 1, further comprising:

performing a call on the multi-SIM UE, wherein the call is associated with the first subscription; and

wherein receiving the SIB from a cell comprises receiving the SIB upon completion of the call, and wherein the cell comprises a last serving cell associated with the call before completion of the call.

9. The method of claim 1, wherein the call comprises one of a packet-switched call and a circuit-switched call.

10. An apparatus, comprising:

a communications component configured to receive, by a first subscription corresponding to a first subscriber identity module (SIM) of a multi-SIM UE, a system information block (SIB) from a cell upon completion of the call, wherein the SIB includes information associated with each of one or more neighbor cells of the cell;

a neighbor cell selecting component configured to select, from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi- SIM UE is to camp; and

a cell camping component configured to camp the second subscription on the target cell.

11. The apparatus of claim 10, wherein the SIB comprises a SIB 18 message and the information included in the SIB comprises a public land mobile network (PLMN) associated with the cell and each of the one or more neighbor cells of the cell; and wherein the neighbor cell selecting component is configured to select, as the target cell, one of the cell and the one or more neighbor cells having an associated PLMN corresponding to a PLMN of the second subscription.

12. The apparatus of claim 11, further comprising:

a comparison component configured to perform a comparison of a network identifier of the second subscription and the PLMN; and

wherein the neighbor cell selecting component is configured to select the target cell based at least in part on the comparison.

13. The apparatus of claim 12, wherein the network identifier comprises at least one of a Home PLMN (HPLMN), a Registered PLMN (RPLMN), an Equivalent PLMN (EPLMN), and a Equivalent Home PLMN (EHPLMN) of the second subscription.

14. The apparatus of claim 10, wherein the communications component is configured to determine a signal strength associated with each of the cell and the one or more neighbor cells, and wherein the neighbor cell selecting component is configured to select the target cell based on the signal strength.

15. The apparatus of claim 14, wherein the neighbor cell selecting component is configured to select the target cell as a strongest cell of the cell and the one or more neighbor cells, wherein the strongest cell has a greatest cell strength of the cell and the one or more neighbor cells.

16. The apparatus of claim 10, wherein the information included in the SIB comprises a radio access technology associated with the cell and each of one or more neighbor cells, and wherein the neighbor cell selecting component is configured to select the target cell with a radio access technology that matches a radio access technology of the second subscription.

17. The apparatus of claim 10, wherein the communications component is configured to:

perform a call on the multi-SIM UE, wherein the call is associated with the first subscription; and

receive the SIB upon completion of the call, and wherein the cell comprises a last service cell associated with the call before completion of the call.

18. The apparatus of claim 10, wherein the call comprises one of a packet- switched call and a circuit-switched call.

19. An apparatus, comprising:

means for receiving, by a first subscription corresponding to a first SIM of the multi-SIM UE, a system information block (SIB) from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell;

means for selecting from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp; and

means for camping the second subscription on the target cell.

20. The apparatus of claim 19, wherein the SIB comprises a SIB 18 message and the information included in the SIB comprises a public land mobile network (PLMN) associated with the cell and each of the one or more neighbor cells of the cell; and wherein the means for selecting the target cell comprises means for selecting one of the cell and the one or more neighbor cells having an associated PLMN corresponding to a PLMN of the second subscription.

21. The apparatus of claim 19, further comprising:

selecting the target cell based at least in part on the comparison.

22. The apparatus of claim 21, wherein the network identifier comprises at least one of a Home PLMN (HPLMN), a Registered PLMN (RPLMN), an Equivalent PLMN (EPLMN), and a Equivalent Home PLMN (EHPLMN) of the second subscription.

23. The apparatus of claim 19, further comprising:

means for determining a signal strength associated with each of the cell and the one or more neighbor cells; and

wherein the means for selecting the target cell comprises means for selecting the target cell based on the signal strength

24. The apparatus of claim 23, wherein the means for selecting the target cell comprises means for selecting the target cell as a strongest cell of the cell and the one or more neighbor cells, wherein the strongest cell has a greatest cell strength of the cell and the one or more neighbor cells.

25. The apparatus of claim 19, wherein the information included in the SIB comprises a radio access technology associated with the cell and each of the one or more neighbor cells, and wherein the means for selecting the target cell upon which the second subscription is to camp comprises means for selecting the target cell with a radio access technology that matches a radio access technology of the second subscription.

26. A non-transitory computer-readable storage medium, comprising instructions, that when executed by a processor, cause the processor to:

receive, by a first subscription corresponding to a first subscriber identity module (SIM) of a multi-SIM user equipment (UE), a system information block (SIB) from a cell, wherein the SIB includes information associated with the cell and each of one or more neighbor cells of the cell;

select from the cell and the one or more neighbor cells and based on the information included in the SIB, a target cell upon which a second subscription corresponding to a second SIM of the multi-SIM UE is to camp; and

camp the second subscription on the target cell.

27. The computer-readable storage medium of claim 26, wherein the SIB comprises a SIB 18 message and the information included in the SIB comprises a public land mobile network (PLMN) associated with the cell and each of the one or more neighbor cells of the cell; and

wherein selecting the target cell comprises selecting one of the cell and the one or more neighbor cells having an associated PLMN corresponding to a PLMN of the second subscription.

28. The computer-readable storage medium of claim 27, further comprising instructions, that when executed by the processor, cause the processor to:

perform a comparison of a network identifier of the second subscription and the PLMN, wherein the network identifier comprises at least one of a Home PLMN (HPLMN), a Registered PLMN (RPLMN), an Equivalent PLMN (EPLMN), and a Equivalent Home PLMN (EHPLMN) of the second subscription; and

select the target cell based at least in part on the comparison.

29. The computer-readable storage medium of claim 26, further comprising instructions, that when executed by the processor, cause the processor to:

determine a signal strength associated with each of the cell and the one or more neighbor cells; and

30. The computer-readable storage medium of claim 29, further comprising instructions, that when executed by the processor, cause the processor to select the target cell as a strongest cell of the cell and the one or more neighbor cells, wherein the strongest cell has a greatest cell strength of the cell and the one or more neighbor cells.