OA18390A - System information updating. - Google Patents

Abstract

A first method includes receiving a first signal at a user equipment (UE), where the UE communicates with a network using first system information, the first signal including an indication of whether system information is to be requested by the UE; determining, based at least in part on the first signal, to request updated system information; and requesting updated system information based at least in part on the determining. A second method includes transmitting a first signal from a base station to a UE, where the UE communicates with a network using first system information, the first signal including an indication of whether system information is to be requested by the UE and information to allow the UE to determine to request updated system information; receiving a request from the UE for updated system information; and transmitting the updated system information based at least in part on the request.

Description

[0002] The présent disclosure, for example, relates to wireless communication Systems, and more particularly to the transmission of on-demand System information in a wireless communication System, such as a wireless communication System having a user equipment (UE)-centric network.

DESCRIPTION OF RELATED ART [0003] Wireless communication Systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadeast, and so on. These Systems may be multiple-access Systems capable of supporting communication with multiple users by sharing the available System resources (e.g., time, frequency, and power). Examples of such multiple-access Systems include code-division multiple access (CDMA)

Systems, time-division multiple access (TDMA) Systems, frequency-division multiple access (FDMA) Systems, and orthogonal frequency-division multiple access (OFDMA) Systems.

[0004] By way of example, a wireless multiple-access communication System may include a number of base stations, each simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs). A base station may communicate with UEs on downlink channels (e.g., for transmissions from a base station to a UE) and uplink channels (e.g., for transmissions from a UE to a base station).

[0005] In a wireless multiple-access communication System, each cell of a network may broadeast synchronization signais and System information for UEs to discover. Upon

discovering the synchronization signais and system information broadcast by a particular cell, a UE may perform an initial access procedure to access the network via the cell. The cell via which the UE accesses the network may become the UE’s serving cell. As the UE moves within the network, the UE may discover other cells (e.g., neighboring cells) and détermine whether a handover of the UE to a neighboring cell or a cell reselection is warranted.

SUMMARY [0006] The présent disclosure generally relates to wireless communication Systems, and more particularly to the transmission of on-demand system information in a wireless communication system, such as a wireless communication system having a user equipment 10 (UE)-centric medium access control (MAC) layer. Wireless communication Systems such as

Long Term Evolution (LTE) communication Systems or LTE-Advanced (LTE-A) communication Systems hâve a network-centric MAC layer. In a wireless communication system having a network-centric MAC layer, the network perpetually broadcasts synchronization signais and system information for UEs to discover. Upon discovering the 15 synchronization signais and system information broadcast by a particular cell, a UE may perform an initial access procedure to access the network via the cell. Once connected to the network, the UE may discover other cells as it moves within the network The other cells may broadcast different synchronization signais or system information. A wireless communication system having a network-centric MAC layer therefore entails various signal 20 broadcasts, which broadcasts consume power and may or may not be received or used by some or ail of a cell’s UEs.

[0007] A wireless communication system having a network-centric MAC layer also places relatively more of the network processing on UEs (e.g., a UE identifies a first serving cell upon initially accessing the network and then identifies and monitors handover targets (other 25 serving cells) as part of its mobility management). The présent disclosure therefore describes a wireless communication system in which system information may be transmitted after being requested by one or more UEs. In some cases, the system information may be transmitted to a UE in a unicast or narrow-beam operation. In some cases, the wireless communication system in which the system information is transmitted may hâve a UE-centric 30 MAC layer.

10008] In a first set of illustrative examples, a method for wireless communication is described. In one configuration, the method may include receiving a first signal at a UE, where the UE communicates with a network using first system information, and where the first signal includes an indication of whether system information is to be requested by the

UE; determining, based at least in part on the first signal, to request updated system information; and requesting updated system information based at least in part on the determining. In some embodiments of the method, determining to request updated system information may include identifying that the UE has moved into a zone using second system information that is different from the first system information. In some embodiments of the 10 method, determining to request updated system information may include identifying that the network has changed at least a portion of the first system information. In some embodiments of the method, determining to request updated system information may include identifying that the UE has moved more than a predetermined distance from a location where the UE obtained the first system information.

[0009] In some embodiments of the method, receiving the first signal may include receiving a zone identifier. In some cases, receiving the zone identifier may include receiving an area code, a base station identity code (BSIC), or other cell identifier. In some cases, receiving the zone identifier may include receiving the zone identifier as part of a synchronization signal. In some cases, the method may include using the zone identifier to 20 identify that the UE has moved from a first zone to a second zone.

[0010] In some embodiments of the method, receiving the first signal may include receiving an indication that at least a portion of the first system information has changed. In some cases, receiving the indication may include receiving a modification flag that indicates by a binary value that a corresponding portion of system information has changed. In some 25 cases, the method may include receiving a value tag associated with master system information that includes one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. In some embodiments ofthe method, determining to request updated system information may include comparing the received value tag associated 30 with master system information with a previously received master system information value tag, and determining to request the updated system information based at least in part on the comparison. In some cases, the method may include receiving one or more value tags

corresponding to different portions of the first System information that hâve changed. In some embodiments of the method, the one or more value tags may correspond to one or more portions of master System information, one or more portions of additional non-master System information, or a combination thereof, where the master System information may include one 5 or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. In some cases, receiving the indication may include receiving the indication as part of a synchronization signal or a paging signal.

[0011] In some embodiments of the method, receiving the first signal may include 10 receiving one or more value tags corresponding to different portions of the first System information that hâve changed. In some embodiments of the method, receiving the first signal may include receiving a location signal identifying a location of the UE.

[0012] In some embodiments of the method, determining to request updated System information may include identifying a distance between a current location of the UE and a 15 location where the UE obtained the first System information, and determining that the identified distance exceeds a predetermined threshold. In some embodiments, the method may include obtaining the predetermined threshold from the network.

[0013] In a second set of illustrative examples, an apparatus for wireless communication is described. In one configuration, the apparatus may include means for receiving a first signal 20 at a UE, where the UE communicates with a network using first System information, and where the first signal includes an indication of whether System information is to be requested by the UE; means for determining, based at least in part on the first signal, to request updated System information; and means for requesting updated System information based at least in part on the determining. In some examples, the apparatus may further include means for 25 implementing one or more aspects of the method for wireless communication described above with respect to the first set of illustrative examples.

[0014] In a third set of illustrative examples, another apparatus for wireless communication is described. In one configuration, the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The 30 instructions may be exécutable by the processor to receive a first signal at a UE, where the

UE communicates with a network using first system information, and where the first signal

includes an indication of whether system information is to be requested by the UE; to détermine, based at least in part on the first signal, to request updated system information; and to request updated system information based at least in part on the determining. In some examples, the instructions may also be exécutable by the processor to implement one or more 5 aspects of the method for wireless communication described above with respect to the first set of illustrative examples.

[0015] In a fourth set of illustrative examples, a non-transitory computer-readable medium storing computer-executable code for wireless communication is described. In one configuration, the code may be exécutable by a processor to receive a first signal at a UE, 10 where the UE communicates with a network using first system information, and where the first signal includes an indication of whether system information is to be requested by the UE; to détermine, based at least in part on the first signal, to request updated system information; and to request updated system information based at least in part on the determining. In some examples, the code may also be used to implement one or more aspects 15 of the method for wireless communication described above with respect to the first set of illustrative examples.

[0016] In a fifth set of illustrative examples, another method for wireless communication is described. In one configuration, the method may include transmitting a first signal from a base station to a UE, where the UE communicates with a network using first system information, and where the first signal includes an indication of whether system information is to be requested by the UE and information to allow the UE to détermine to request updated system information; receiving a request from the UE for updated system information; and transmitting the updated system information based at least in part on the request.

[0017] In some embodiments of the method, transmitting the first signal may include 25 transmitting a zone identifier. In some cases, transmitting the zone identifier may include transmitting an area code, a BSIC, or other cell identifier. In some cases, transmitting the zone identifier may include transmitting the zone identifier as part of a synchronization signal.

[0018] In some embodiments of the method, transmitting the first signal may include transmitting an indication that at least a portion of the first system information has changed. In some cases, transmitting the indication may include transmitting a modification flag that

indicates by a binary value that a corresponding portion of the first System information has changed. In some cases, the method may include transmitting a value tag associated with master system information that includes one or more of an identification of the network, an identification of the base station, cell sélection configuration and access restrictions, or 5 network access configuration. In some cases, the method may include transmitting one or more value tags corresponding to different portions of the first system information that hâve changed. In some embodiments of the method, the one or more value tags may correspond to one or more portions of master System information, one or more portions of additional nonmaster system information, or a combination thereof, where the master system information 10 may include one or more of an identification of the network, an identification of the base station, cell sélection configuration and access restrictions, or network access configuration. In some cases, transmitting the indication may include transmitting the indication as part of a synchronization signal or a paging signal. In some embodiments of the method, transmitting the first signal may include transmitting one or more value tags corresponding to different 15 portions of the first system information that hâve changed.

[0019] In a sixth set of illustrative examples, another apparatus for wireless communication is described. In one configuration, the apparatus may include means for transmitting a first signal from a base station to a UE, where the UE communicates with a network using first system information, and where the first signal includes an indication of whether system 20 information is to be requested by the UE and information to allow the UE to détermine to request updated System information; means for receiving a request from the UE for updated system information; and means for transmitting the updated System information based at least in part on the request. In some examples, the apparatus may further include means for implementing one or more aspects of the method for wireless communication described 25 above with respect to the fifth set of illustrative examples.

[0020] In a seventh set of illustrative examples, another apparatus for wireless communication is described. In one configuration, the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be exécutable by the processor to transmit a first signal from 30 a base station to a UE, where the UE communicates with a network using first system information, and where the first signal includes an indication of whether system information is to be requested by the UE and information to allow the UE to détermine to request updated

system information; to receive a request from the UE for updated system information; and to transmit the updated system information based at least in part on the request. In some examples, the instructions may also be exécutable by the processor to implement one or more aspects ofthe method for wireless communication described above with respect to the fifth 5 set of illustrative examples.

[0021] In an eighth set of illustrative examples, another non-transitory computer-readable medium storing computer-executable code for wireless communication is described. In one configuration, the code may be exécutable by a processor to transmit a first signal from a base station to a UE, where the UE communicates with a network using first system information, and where the first signal includes an indication of whether system information is to be requested by the UE and information to allow the UE to détermine to request updated system information; to receive a request from the UE for updated system information; and to transmit the updated system information based at least in part on the request. In some examples, the code may also be used to implement one or more aspects of the method for wireless communication described above with respect to the fifth set of illustrative examples.

[0022] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and spécifie examples disclosed may be readily utilized as a basis for modifÿing 20 or designing other structures for carrying out the same purposes of the présent disclosure.

Such équivalent constructions do not départ from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when consîdered in connection with the accompanying figures. Each of the 25 figures is provided for the purpose of illustration and description only, and not as a définition of the limits of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS [0023] A further understanding of the nature and advantages of the présent disclosure may be realized by reference to the following drawings. In the appended figures, similar components or features may hâve the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second

label that distinguishes among the similar components. If only the first reference label is used in the spécification, the description is applicable to any one of the similar components having the same first reference label irrespective ofthe second reference label.

[0024] FIG. 1 illustrâtes an example of a wireless communication system in accordance with various aspects of the présent disclosure;

[0025] FIG. 2 shows an example of user equipment (UE) mobility within a wireless communication system in accordance with various aspects of the présent disclosure;

[0026] FIG. 3 illustrâtes example transmission/reception timelines of a respective first base station, second base station, third base station, and fourth base station, in accordance with various aspects ofthe présent disclosure;

[0027] FIG. 4 is a swim lane diagram illustratîng transmissions of a sync signal, a master system information block (MSIB), and another system information block (OSIB) by a base station, in accordance with various aspects of the présent disclosure;

[0028] FIG. 5 illustrâtes a Venn diagram of respective coverage areas for a 5G wireless communication network, a first neighbor radio access technology (RAT; e.g., a neighbor

RAT1), a second neighbor RAT (e.g., a neighbor RAT2), and a third neighbor RAT (e.g., a neighbor RAT3), in accordance with various aspects of the présent disclosure;

[0029] FIG. 6 is a swim lane diagram illustratîng transmissions of a sync signal, an MSIB, and an OSIB by a base station, in accordance with various aspects of the présent disclosure;

[0030] FIG. 7 shows a block diagram of a UE for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0031] FIG. 8 shows a block diagram of a UE for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0032] FIG. 9 shows a block diagram of a UE for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0033] FIG. 10 shows a block diagram of a UE for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0034] FIG. 11 shows a block diagram of a UE for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0035] FIG. 12 shows a block diagram of a UE for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0036] FIG. 13 shows a block diagram of a UE for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0037] FIG. 14 shows a block diagram of a base station for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0038] FIG. 15 shows a block diagram of a base station for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0039] FIG. 16 shows a block diagram of a base station for use in wireless communication, 10 in accordance with various aspects of the présent disclosure;

[0040] FIG. 17 shows a block diagram of a base station for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0041] FIG. 18 shows a block diagram of a base station for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0042] FIG. 19 shows a block diagram of a base station for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0043] FIG. 20A shows a block diagram of a base station (e.g., a base station forming part or ail of an eNB) for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0044] FIG. 20B shows a block diagram of a base station (e.g., a base station forming part or ail of an eNB) for use in wireless communication, in accordance with various aspects of the présent disclosure;

[0045] FIG. 21 is a block diagram of a multiple input multiple output (ΜΙΜΟ) communication System including a base station and a UE, in accordance with various aspects 25 of the présent disclosure;

[0046] FIG. 22 is a flow chart illustrating an example of a method for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure;

[0047] FIG. 23 is a flow chart illustrating an example of a method for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure;

[0048] FIG. 24 is a flow chart illustrating an example of a method for wireless communication at a UE, in accordance with various aspects of the présent disclosure;

[0049] FIG. 25 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure;

[0050] FIG. 26 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure;

[0051] FIG. 27 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure;

[0052] FIG. 28 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects ofthe présent disclosure;

[0053] FIG. 29 is a flow chart illustrating an example of a method for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure;

[0054] FIG. 30 is a flow chart illustrating an example of a method for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure;

[0055] FIG. 31 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure;

[0056] FIG. 32 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure;

[0057] FIG. 33 is a flow chart illustrating an example of a method for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure;

[0058] FIG. 34 is a flow chart illustrating an example of a method for wireless communication at a UE, in accordance with various aspects of the présent disclosure;

[0059] FIG. 35 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure;

[0060] FIG. 36 is a flow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure;

[0061] FIG. 37 is a fiow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure; and [0062] FIG. 38 is a fiow chart illustrating an example of a method for wireless communication at a base station, in accordance with various aspects of the présent disclosure.

DETAILED DESCRIPTION [0063] The described features may generally be implemented in a wireless communication System having a user equipment (UE)-centric network. A UE-centric network may be deployed, in some cases: as a plurality of base stations in which each of one or more base stations are associated with a number of transceivers co-located with base station servers; as a plurality of base stations in which each of one or more base stations are associated with a number of remote transceivers (e.g., a number of remote radio heads (RRHs) located remotely from base station servers; as a number of zones in which each zone is defined by the coverage area(s) of one or more cells or base stations; or as a combination thereof. A wireless communication System having a UE-centric network may be advantageous, in some respects, in a time-division duplex (TDD) System having a large antenna array, which large antenna array may hâve limited coverage for broadeast channels (e.g., the channels that broadeast synchronization signais and System information in a wireless communication System having a network-centric network). As described in the présent disclosure, a wireless communication System having a UE-centric network may forego the broadeast of System information. A wireless communication System having a UE-centric network may also be advantageous, in some respects, because the broadeast of System information by a base station can contribute significantly to the power consumption of the base station.

[0064] In one aspect of the disclosure, for example, a wireless network may provide 25 System information by either a fixed periodic broadeast or broad-beam transmission or in response to a request by a UE. The wireless network may broadeast (or broad-beam transmit) a synchronization signal, for example, that indicates to the UEs within a cell or zone coverage area that System information is to be transmitted on a fixed periodic schedule, or in response to a request sent by one or more UEs. In an “on-demand” System, wherein the UEs request the transmission of System information, the System information may be transmitted as either a

periodic broadeast or broad-beam transmission, as an aperiodic broadeast or broad-beam transmission, or as an aperiodic unicast or narrow-beam transmission.

[0065] In another aspect of the disclosure, a wireless network may provide system information to a UE incrementally. For example, the wireless network may transmit master system information, followed by one or more transmissions of other system information (e.g., non-master system information). The master system information may include, for example, system information that allows a UE to perform an initial access of a network. The master system information or other system information may be broadeast, broad-beam transmitted, unicast, or narrow-beam transmitted to a number of UEs. In some cases, the master system information or other system information may be transmitted on a fixed periodic schedule, or in response to a request sent by one or more UEs. In various embodiments, the master system information and other system information may be transmitted in the same, similar, or different ways.

[0066] In yet another aspect of the disclosure, for example, a wireless network may indicate when system information has changed or should be updated. In this manner, a UE need not update its stored system information every time system information is transmitted, but may instead update its stored system information on an “as needed” basis. A UE may also initiate an update of its stored system information upon the occurrence of one or more events, such as: a détermination that the UE has moved a certain distance since last updating 20 its stored system information, or a détermination that the UE has moved into a new zone.

[0067] Techniques described herein may be used for various wireless communication Systems such as 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, and single carrier frequency-division 25 multiple access (SC-FDMA) Systems, and other Systems. The terms “system” and “network” are often used interchangeably. A CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases 0 and A are commonly referred to as CDMA2000 IX, IX, etc. IS-856 (ΊΊΑ-856) is commonly referred to as CDMA2000 lxEV30 DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA system may implement a

radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM™, etc. UTRA and EUTRA are part of Universal Mobile Télécommunication System (UMTS). Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are newer releases of UMTS that use E5 UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named “3rd Génération Partnership Project” (3GPP). CDMA2000 and UMB are described in documents from an organization named “3rd Génération Partnership Project 2” (3GPP2). The techniques described herein may be used for the Systems and radio technologies mentioned above as well as other Systems and radio technologies, including cellular (e.g., LTE) communications over a shared radio frequency spectrum band. The description below, however, describes an LTE/LTE-A system for purposes of example, and LTE terminology is used in much ofthe description below, although the techniques are applicable beyond LTE/LTE-A applications (e.g., to 5G networks or other next génération communication Systems).

[0068] The following description provides examples, and is not limiting of the scope, applicability, or examples set forth in the claims. Changes may be made in the fonction and arrangement of éléments 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 other examples.

[0069] FIG. 1 illustrâtes an example of a wireless communication system 100 in accordance with various aspects of the présent disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. The core network 130 may provide user authentication, access authorization, tracking, internet protocol (IP) connectivity, and other access, routing, or mobility functions. The base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., SI, etc.). The base stations 105 may perform radio configuration and scheduling for communication with the UEs 115, or may operate under the control of a base station controller (not shown). In various examples, the base stations 105 may communicate, either directly or indirectly (e.g., through core network 130), with one another over backhaul links 134 (e.g., XI, etc.), which may be wired or wireless communication links.

[0070] The base stations 105 may wirelessly communicate with the UEs 115 via one or more antennas. In some examples, the one or more antennas may include one or more base station antennas (and transceivers) co-located with base station servers and/or one or more RRH antennas (and transceivers) located remotely from base station servers. Each of the base stations 105 may provide communication coverage for a respective géographie coverage area 110. In some examples, base stations 105 may be referred to as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, eNodeB (eNB), Home NodeB (HNB), a Home eNodeB, or some other suitable terminology. The géographie coverage area 110 for a base station 105 may be divided into sectors making up only a portion ofthe coverage area (not shown). The géographie coverage area(s) 110 of for one or more base stations 105 may define a zone ofthe wireless communication system 100. The wireless communication system 100 may include base stations 105 of different types (e.g., macro or small cell base stations). There may be overiapping géographie coverage areas 110 for different technologies.

[0071] In some examples, the wireless communication system 100 may be or include an

LTE or LTE-A network. The wireless communication system 100 may also be or include a next génération network, such as a 5G wireless communication network. In LTE/LTE-A and 5G networks, the term evolved node B (eNB) may be generally used to describe the base stations 105, while the term UE may be generally used to describe the UEs 115. The wireless communication system 100 may be a heterogeneous LTE/LTE-A or 5G network in which different types of eNBs provide coverage for various geographical régions. For example, each eNB or base station 105 may provide communication coverage for a macro cell, a small cell, or other types of cell. The term “cell” is a 3GPP term that can be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc.) of a carrier or base station, depending on context.

[0072] A macro cell may generally cover a relatively large géographie area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 115 with service subscriptions with the network provider. A small cell may include a lower-powered base station, as compared with a macro cell, that may operate in the same or different (e.g., lîcensed, unlicensed, etc.) frequency bands as macro cells. Small cells may include pico cells, femto cells, and micro cells according to various examples. A pico cell, for example, may cover a small géographie area and may allow unrestricted access by UEs 115 with

service subscriptions with the network provider. A femto cell may also cover a small géographie area (e.g., a home) and may provide restricted access by UEs 115 having an association with the femto cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 for users in the home, and the like). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or multiple (e.g., two, three, four, and the like) cells.

[0073] The communication networks that may accommodate some of the various disclosed examples may be packet-based networks that operate according to a layered protocol stack and data in the user plane may be based on the IP. A radio link control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use HARQ to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and the base stations 105. The RRC protocol layer may also be used for core network 130 support of radio bearers for the user plane data. At the physical (PHY) layer, the transport channels may be mapped to physical channels.

[0074] The UEs 115 may be dispersed throughout the wireless communication System 100, and each UE 115 may be stationary or mobile. A UE 115 may also include or 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 user agent, a mobile client, a client, or some other suitable terminology. A UE 115 may be a cellular phone, a Smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a data card, a Universal Serial Bus (USB) dongle, a wireless router, etc.. A UE 115 may be able to communicate with various types of base stations and network equipment including macro eNBs, small cell eNBs, relay base stations, and the like. As a UE 115 moves within the wireless communication System 100, the UE 115 may move from cell to cell or from zone to zone (with a zone including one or more cells). When the wireless

communication system 100 is deployed as a UE-centric network, a UE 115 may move from cell to cell within a zone without a physical channel reconfiguration, with the network providing data transfer services via the same radio resources despite a change in the UE’s serving cell.

[0075] The wireless communication links 125 shown in wireless communication system

100 may carry uplink (UL) transmissions from a UE 115 to a base station 105, or downlink (DL) transmissions, from a base station 105 to a UE 115. The downlink transmissions may also be called forward link transmissions while the uplink transmissions may also be called reverse link transmissions. Each wireless communication link 125 may include one or more 10 carriers, where each carrier may be a signal made up of multiple sub-carriers (e.g., waveform signais of different frequencies) modulated according to the various radio technologies described above. Each modulated signal may be sent on a different sub-carrier and may carry control information (e.g., reference signais, control channels, etc.), overhead information, user data, etc. The wireless communication links 125 may transmit bidirectional communications using frequency division duplex (FDD) (e.g., using paired spectrum resources) or TDD operation (e.g., using unpaired spectrum resources). Frame structures may be defined for FDD (e.g., frame structure type 1) and TDD (e.g., frame structure type 2). [0076] In some embodiments of the wireless communication system 100, base stations 105 or UEs 115 may include multiple antennas for employing antenna diversity schemes to improve communication quality and reliability between base stations 105 and UEs 115. Additionally or alternatively, base stations 105 or UEs 115 may employ multiple input multiple output (ΜΙΜΟ) techniques (e.g., any ΜΙΜΟ but not massive ΜΙΜΟ (e.g. multiantenna ΜΙΜΟ and multi-user ΜΙΜΟ) techniques or massive ΜΙΜΟ techniques) that may take advantage of multi-path environments to transmit multiple spatial layers carrying the 25 same or different coded data.

[0077] Wireless communication system 100 may support operation on multiple cells or carriers, a feature which may be referred to as carrier aggregation (CA) or multi-carrier operation. A carrier may also be referred to as a component carrier (CC), a layer, a channel, etc. The terms “carrier,” “component carrier,” “cell,” and “channel” may be used interchangeably herein. A UE 115 may be configured with multiple downlink CCs and one or more uplink CCs for carrier aggregation. Carrier aggregation may be used with both FDD and TDD component carriers.

• 17 [0078] In some embodiments of the wireless communication system 100, the wireless communication System 100 may hâve a UE-centric network. On the network side, the base stations 105 may broadeast a periodic synchronization (sync) signal. The UEs 115 may receive the sync signal, acquire a timing of the network from the sync signal, and in response to acquiring the timing of the network, transmit a pilot signal. The pilot signal transmitted by a UE 115 may be concurrently receivable by a plurality of cells (e.g., base stations 105) within the network. Each of the plurality of cells may measure a strength of the pilot signal, and the network (e.g., one or more ofthe base stations 105, each in communication with the UE 115 via one or more centrally-located transceivers and/or RRHs, and/or a central node within the core network 130) may détermine a serving cell for the UE 115. As the UE 115 continues to transmît a pilot signal, the network may handover the UE 115 from one serving cell to another, with or without informing the UE 115. System information (SI) may be transmitted to the UEs 115 in a broadeast mode (e.g., where a base station 105 transmits SI regardless of whether the SI is requested or needed by any UE 115 within the coverage area

110 of the base station 105) or in an on-demand mode (e.g., where a base station 105 transmits SI in response to receiving a request for SI from one or more UEs 115, which request may be ïncluded in, or be, the pilot signal of a UE 115). When transmitting SI in an on-demand mode, a base station 105 may forego the broadeast of SI, which may conserve power.

[0079] FIG. 2 shows an example of UE mobility within a wireless communication system

200 in accordance with various aspects ofthe présent disclosure. More particularly, FIG. 2 shows a UE 115-a as it moves to various points (e.g., point A, point B, and point C) within the coverage areas 110-a and 110-b of respective first and second base stations 105-a and 105-b. In some examples, the UE 115-a may be an example of one or more aspects ofthe

UEs 115 described with reference to FIG. 1, and the first and second base stations 105-a and 105-b may be examples of one or more aspects ofthe base stations 105 described with reference to FIG. 1.

[0080] By way of example, the UE 115-a may be powered on within the coverage area 110-a of the first base station 105-a and may perform an initial acquisition of SI within the coverage area 110-a of the first base station 105-a. In some examples, the UE 115-a may perform an initial acquisition of SI by receiving an instance of a periodic sync signal from the first base station 105-a; determining, from the sync signal, where and when to listen for a • 18 broadeast of SI by the first base station 105-a; and then listening for and receiving the SI broadeast by the first base station 105-a. In other examples, the UE 115-a may perform an initial acquisition of SI by receiving an instance of a periodic sync signal from the first base station 105-a; determining, from the sync signal, where and when to listen for a broadeast of

SI by the first base station 105-a and, in some cases, where and when to transmit a request for SI; transmitting a request for SI; and then listening for and receiving the SI broadeast by the first base station 105-a.

[0081] While still at point A, the UE 115-a may détermine to reacquire SI based on the expiration of dynamic SI, or based on an elapsed time since last acquiring SI. The UE 115-a may also reacquire SI, at point A, after receiving an instance of a sync signal indicating that SI has changed. In other embodiments, the UE 115-a may not reacquire SI at point A.

[0082] Upon moving from point A to point B, the UE 115-a may détermine to reacquire SI. The UE 115-a may détermine to reacquire SI, for example, based on its movement, based on the distance between point A and point B, based on the expiration of dynamic SI, or based on an elapsed time since last acquiring SI. The UE 115-a may also reacquire SI, at point B, after receiving an instance of a sync signal indicating that SI has changed. In other embodiments, the UE 115-a may not reacquire SI at point B.

[0083] Upon moving from point B to point C, and into the coverage area 110-b of the second base station 105-b, the UE 115-a may perform an initial acquisition of SI from the second base station 105-b. In other embodiments, the UE 115-a need not acquire SI from the second base station 105-b unless one of the reasons for reacquiring SI at point B arises. In some cases, SI may not be acquired at the coverage area 110-b because the first coverage area 110-a and the second coverage area 110-b are configured to operate as members of a common zone, such that data transfer services for the UE 115-a are provided by the network.

[0084] FIG. 2 illustrâtes that SI may be acquired during various UE mobility states, and for various reasons. For example, SI may be acquired when a UE is unattached to a network (e.g., as part of an initial acquisition of SI). SI may also be acquired after a UE attaches to a network and while the UE is stationary (e.g., because a timer or SI has expired, or because the network has indicated (e.g., in an instance of a sync signal or in a paging message) that SI has changed). SI may also be acquired after a UE attaches to a network and while the UE is mobile (e.g., for any of the reasons that SI is reacquired while the UE is stationary, because • » the UE has moved to a new location, because the UE has moved a certain distance from a previous location at which SI was acquired, or because the UE has moved to a coverage area of a new base station or cell).

[0085] FIG. 3 illustrâtes example transmission/reception timelines 305, 330,355, and 380 of a respective first base station, second base station, third base station, and fourth base station, in accordance with various aspects ofthe présent disclosure. The transmissions ofthe base stations may be received by one or more UEs and used, by the UE(s), during initial SI acquisition (e.g., SI acquisition during system sélection or mobility to a new cell or zone) or an SI change acquisition (e.g., upon a change of SI, or upon expiration of dynamic SI). In some examples, the base stations may belong to respective different cells or zones of a wireless communication system, such as different cells or zones ofthe wireless communication system 100 or 200 described with reference to FIGs. 1 or 2. In some examples, the first base station, second base station, third base station, and fourth base station may be examples of one or more aspects of the base stations 105 described with reference to 15 FIG. 1.

[0086] As shown in FIG. 3, each of the first, second, third, and fourth base stations may transmit a periodic sync signal (Sync) 310,335,360, or 385 and a periodic or on-demand master system information block (MSIB) 315,340,365, or 390. In some cases, an instance of a sync signal and an instance of an MSIB, together, may provide information équivalent to 20 the information included in an LTE/LTE-A master information block (MIB), system information block 1 (SIB1), and SIB2.

[0087] In some embodiments, a sync signal transmitted by a base station may be common (e.g., non-cell-specific) to a plurality of cells within an access network (e.g., to a plurality of cells within a zone), and may be broadcast from each ofthe cells in the plurality of cells (e.g., 25 from each of a plurality of base stations in the cells) in a single frequency network (SFN) manner. The sync signal need not include a cell identifier. In some embodiments, the sync signal may hâve a relatively short duration or be transmitted relatively infrequently. For example, the sync signal may hâve a duration of one symbol and be transmitted once every ten seconds. In other examples, the sync signal may be transmitted more frequently, such as 30 once per radio frame. In some embodiments, an instance of a sync signal may carry a few bits of information. More particularly, and in some embodiments, an instance of a sync signal may include information such as: information that a UE may use to détermine whether

to request a subsequently transmitted MSIB, information that a UE may use to détermine where and when to request the subsequently transmitted MSIB (e.g., frequency and timing information for transmitting an MSIB transmission request), information that a UE may use to détermine where and when the subsequently transmitted MSIB may be received (e.g., channel, frequency, and/or timing information), information that indicates when an MSIB has changed, or information that a UE may use to distinguish the cell or zone transmitting the sync signal from one or more other cells or zones (e.g., from neighboring cells or zones).

[0088] In some embodiments, a sync signal may indicate a PHY layer channel on which an MSIB transmission request is to be transmitted, or indicate a spécial PHY layer channel for 10 the transmission of an MSIB transmission request under certain conditions. In some cases, a sync signal may also indicate how to transmit an MSIB transmission request (e.g., a format to be used when transmitting an MSIB transmission request), or how to transmit an MSIB transmission request under certain conditions. In other embodiments, a sync signal may specify fewer parameters for the transmission of an MSIB transmission request. However, 15 this may necessitate the base station listening for MSIB transmission requests under more conditions (or always), which may impact UE relay energy efficiency.

[0089] A UE may receive an instance of a sync signal and acquire a timing of an access network based on the sync signal. In response to acquiring the timing of the access network, the UE may transmit a pilot signal. The pilot signal may be concurrently receivable by a 20 plurality of cells within the access network (e.g., by a plurality of cells within a zone of the access network). In some embodiments, the pilot signal may include a spatial signature (e.g., a sounding reference signal (SRS)). In some embodiments, the pilot signal may be transmitted in an MSIB transmission request occasion indicated by an instance of the sync signal. In some embodiments, the pilot signal may be transmitted with a pre-determined 25 random sequence or a random sequence generated by the UE, which random sequence may be used by the access network (e.g., a base station of the network) to temporarily identify the UE during an initial acquisition procedure. In some embodiments, the pilot signal may be or include the MSIB transmission request.

[0090] An MSIB 315, 340, 365, or 390 may indicate where and when a UE may establish a 30 connection with an access network. An MSIB may include information such as: information identifying an access network, cell, or zone; information indicating whether a UE is allowed to (or should) use the access network; or information indicating how a UE may use the access

network (e.g., information indicatîng how a UE may use the access network when the UE powers up, or when the UE moves to a new cell or zone after detecting an out-of-service (OoS) or radio link failure (RLF) event). The information identifying an access network, cell, or zone may include a public land mobile network (PLMN) identifier (ID), a tracking 5 area code (TAC), a cell identifier (cell ID), or a zone identifier (zone ID). The information indicatîng whether a UE is allowed to (or should) use the access network may include System sélection or access restriction information for a cell or zone (e.g., radio quality information, congestion avoidance information, or closed subscriber group (CSG) information). The information indicatîng how a UE may use the access network may include access configuration information (e.g., random access channel (RACH) information, or UE-timers and constants information). The MSIB may also include PHY layer configuration information such as: physical random access channel (PRACH) information, physical downlink shared channel (PDSCH) information, physical downlink control channel (PDCCH) information, physical uplink shared channel (PUSCH) information, physical uplink 15 control channel (PUCCH) information, and SRS information, or other information usable to access a PHY layer of the wireless communication System.

[0091] Tuming now to the transmission/reception timeline 305 of the first base station, the first base station may transmit a periodic sync signal 310 as previously described. Upon receiving an instance of the sync signal 310, a UE needing to perform initial acquisition may 20 identify an access network associated with the first base station (and in some cases, information to differentiate the first base station, its cell, or its zone from other base stations, cells, or zones); détermine whether the UE can (or should) acquire SI ofthe access network; and détermine how the UE can acquire SI of the access network. When determining how the UE can acquire SI of the access network, the UE may détermine, via signaling associated 25 with the sync signal, that the first base station transmits an MSIB 315 in a broadcast (or broad-beam) transmission mode with fixed periodic signaling. The UE may also identify, from the sync signal, a time for receiving the MSIB transmission. A UE that does not need to perform initial acquisition may détermine, from the sync signal 310, whether it has moved to a new cell or new zone. When a UE détermines that it has moved to a new cell or new zone, 30 the UE may use information included in the sync signal to acquire new or updated SI from the new cell or new zone.

[0092] With reference to the transmission/reception timeline 330 of the second base station, the second base station may transmit a periodic sync signal 335 as previously described. Upon receiving an instance of the sync signal 335, a UE needing to perform initial acquisition may identify an access network associated with the second base station (and in some cases, information to differentiate the first base station, its cell, or its zone from other base stations, cells, or zones); détermine whether the UE can (or should) acquire SI of the access network; and détermine how the UE can acquire SI of the access network. When determining how the UE can acquire the SI of access network, the UE may détermine, via signaling associated with the sync signal, that the second base station transmits an MSIB 340 10 in an on-demand broadeast (or broad-beam) transmission mode with periodic signaling (i.e., that the second base station will start a broadeast (or broad-beam) transmission of the MSIB, with a periodic scheduling, upon receiving an MSIB transmission request signal 345 from the UE). The UE may also identify, from the sync signal 335, where and when to transmit the MSIB transmission request signal 345, and a time for receiving the MSIB transmission 340.

A UE that does not need to perform initial acquisition may détermine, from the sync signal 335, whether it has moved to a new cell or new zone. When a UE détermines that it has moved to a new cell or new zone, the UE may use information included in the sync signal 335 to acquire new or updated SI from the new cell or new zone.

[0093] With reference to the transmission/reception timeline 355 of the third base station, 20 the third base station may transmit a periodic sync signal 360 as previously described. Upon receiving an instance ofthe sync signal 360, a UE needing to perform initial acquisition may identify an access network associated with the third base station (and in some cases, information to differentiate the third base station, its cell, or its zone from other base stations, cells, or zones); détermine whether the UE can (or should) acquire SI of the access network;

and détermine how the UE can acquire SI of the access network. When determining how the UE can acquire SI of the access network, the UE may détermine, via signaling associated with the sync signal, that the third base station transmits an MSIB 365 in an on-demand broadeast (or broad-beam) transmission mode with aperiodic signaling (i.e., that the third base station will schedule a broadeast (or broad-beam) transmission of the MSIB 365 upon receiving an MSIB transmission request signal 370 from the UE, and that the UE may monitor a scheduling channel (e.g., a PDCCH) for scheduling information (Sched.) 375 to détermine when the MSIB 365 will be transmitted). The UE may also identify, from the sync φ 23 signal 360, where and when to transmit the MSIB transmission request signal 370. A UE that does not need to perform initial acquisition may détermine, from the sync signal 360, whether it has moved to a new cell or new zone. When a UE détermines that it has moved to a new cell or new zone, the UE may use information included in the sync signal 360 to acquire new or updated SI from the new cell or new zone.

[0094] With reference to the transmission/reception timeline 380 of the fourth base station, the fourth base station may transmit a periodic sync signal 385 as previously described.

Upon receiving an instance ofthe sync signal 385, a UE needing to perform initial acquisition may identify an access network associated with the fourth base station (and in some cases, information to differentiate the fourth base station, its cell, or its zone from other base stations, cells, or zones); détermine whether the UE can (or should) acquire SI of the access network; and détermine how the UE can acquire SI ofthe access network. When determining how the UE can acquire SI of the access network, the UE may détermine, via signaling associated with the sync signal 385, that the fourth base station transmits an MSIB 390 in a unicast (or narrow-beam) transmission mode (i.e., that the fourth base station will schedule a unicast (or narrow-beam) transmission of the MSIB 390 upon receiving an MSIB transmission request signal 395 from the UE, and that the UE may monitor a scheduling channel (e.g., a PDCCH) for scheduling information (Sched.) 400 to détermine when the MSIB 390 will be transmitted). The UE may also identify, from the sync signal 385, where and when to transmit the MSIB transmission request signal 395. A UE that does not need to perform initial acquisition may détermine, from the sync signal 385, whether it has moved to a new cell or new zone. When a UE détermines that it has moved to a new cell or new zone, the UE may use information included in the sync signal 385 to acquire new or updated SI from the new cell or new zone.

[0095] In each of the transmission/reception timelines 305, 330, 355, and 380 shown in

FIG. 3, the base station transmits an MSIB 315,340,365, or 390. A UE may receive the MSIB, in some examples, by monitoring a System Information-Radio Network Temporary Identifier (SI-RNTI) on a common physical control channel (e.g., a PDCCH), decoding a downlink assignment message associated with the SI-RNTI, and receiving the MSIB on a shared channel (e.g., a PDSCH) according to information contained in the downlink assignment message. Altematively, when a Radio Network Temporary Identifier (RNTI; e.g., a cell-RNTI (C-RNTI) or zone-RNTI (Z-RNTI)) is assigned for the UE, the UE may • 24 monitor the RNTI on a common physical control channel (e.g., a PDCCH), décodé a downlink assignment message associated with the RNTI, and receive the MSIB on a shared channel (e.g., a PDSCH) according to information contained in the downlink assignment message. In another alternative, the UE may monitor an SI-RNTI in order to receive broadeast SI, while the UE may also use an RNTI dedicatedly allocated for the UE (e.g., CRNTI or zone RNTI) to receive unicast SI.

[0096] When camped on a cell, a UE may décodé at least a portion of each instance of the periodic sync signal transmitted by the cell, to détermine whether information included in the MSIB has changed. Altematively, the UE may décodé at least a portion of every Nth instance ofthe periodic sync signal, or may décodé at least a portion ofan instance ofthe periodic sync signal upon the occurrence of one or more events. The decoded portion of a subséquent instance ofthe sync signal may include information (e.g., a modification flag or value tag) which may be set to indicate whether SI for the cell has changed. Upon determining that SI for the cell has changed (e.g., after receiving the instance 310-a of the sync signal 310 in transmission/reception timeline 305), the UE may request and/or receive an MSIB (e.g., MSIB 315-a) with the changed SI.

[0097] As a UE moves within the coverage area of a wireless communication system, the UE may detect sync signais of different cells (or zones), such as the sync signais ofthe different cells (or coverage areas 110,110-a, 110-b or zones) described with reference to

FIGs. 1 or 2, or the different cells (or base stations or zones) described with reference to FIG. 3. Upon detecting a sync signal of a cell or zone, a UE may compare a cell global identity (CGI) (or base station identity code (BSIC) or zone identity) corresponding to a cell (or base station or zone) for which the UE last acquired SI to a CGI (or BSIC or zone identity) associated with the sync signal, to détermine whether the UE has detected a new sync signal (e.g., a sync signal of a different cell, base station, or zone).

[0098] An on-demand transmission of an MSIB may be initiated by a UE (e.g., during initial access) or by an access network (e.g., when information included in the MSIB changes, or when a dedicated SIB is transmitted). In some cases, a base station transmitting and receiving signais in accord with one ofthe transmission/reception timelines 305,330,355, or

380 may switch transmission/reception modes, and thereby switch from one of the transmission/reception timelines to another ofthe transmission/reception timelines. The switch may be made, for example, based on network loading or congestion status. In some • 25 embodiments, a base station may also or alternatively switch between an “on-demand unicast (or narrow-beam)” mode and an “always-on broadcast (or broad-beam)” mode for MSIB transmissions. In some examples, a base station may signal the mode or modes under which it is operating in its periodic sync signal.

[0099] In addition to a periodic or on-demand MSIB, a base station may transmit one or more periodic or on-demand other SIBs (OSIBs). An OSIB may include information équivalent to the information included in one or more of the LTE/LTE-A SIBs other than SIB1 or SIB2 (e.g., information to enable an operator to manage system sélection intra-radio access technology (RAT) or inter-RAT, information for a UE to discover the avaîlability and configuration(s) of one or more services). One example transmission of an OSIB is shown in FIG. 4.

[0100] FIG. 4 is a swim lane diagram 400 illustrating transmissions of a sync signal, an MSIB, and an OSIB by a base station 105-c, in accordance with various aspects of the présent disclosure. FIG. 4 also illustrâtes requests and réceptions of the MSIB and OSIB by a UE

115-b performing initial acquisition of SI of an access network. In some examples, the base station 105-c may incorporate aspects of one or more of the base stations 105,105-a, or 105-b described with reference to FIGs. 1 or 2. Similarly, the UE 115-b may incorporate aspects of one or more of the UEs 115 described with reference to FIGs. 1 or 2.

[0101] At 405, the base station 105-c may transmit an instance of a periodic sync signal, as described with reference to FIG. 3. The UE 115-b may receive the instance of the sync signal and, at block 410, process the instance of the sync signal and détermine that it needs to transmit an MSIB transmission request, at 415, to obtain an MSIB from the base station. The UE 115-b may also détermine, from the instance of the sync signal, where and when to transmit the MSIB transmission request and where and when to expect transmission ofthe

MSIB by the base station 105-c.

[0102] At 420, the base station 105-c may transmit the MSIB. The UE 115-b may receive the MSIB and, at block 425, process information included in the MSIB. The UE 115-b may also, and optionally, préparé an OSIB transmission request. In some examples, an optional OSIB transmission request may be prepared (e.g., at block 425) and transmitted (e.g., at 430) when the UE 115-b has not previously acquired SI from the cell or zone in which the base station 115-c opérâtes, or when cached SI for the cell or zone has expired, or when the UE • ²⁶

115-b détermines that SI for the cell or zone has changed (e.g., from the sync signal, from information in the MSIB signaling a change in SI, or from a paging message), or when the UE 115-b détermines (e.g., during RRC_IDLE) that it is in a location where new SI may be provided (e.g., a location in which new neighbor cell list équivalent information may be provided, or a location where new global positioning system (GPS) assistance information may be provided). In some cases, the OSIB transmission request may indicate what OSIB information is being requested. For example, a UE 115-b may indicate, in the OSIB transmission request, what SI (e.g., what type of SI or what SIBs) the UE 115-b would like to receive. In some examples, a single OSIB transmission request 430 may be transmitted, and the single OSIB transmission request 430 may indicate one or a plurality of éléments of other SI that the UE would like to receive (e.g., a binary value may be set to TRUE for each element of other SI that the UE 115-b would like to receive). In other examples, the UE 115b may request some types of other SI in different OSIB transmission requests, and the UE 115-b may transmit a plurality of OSIB transmission requests to the base station 105-c.

[0103] The base station 105-c may receive the OSIB transmission request (or OSIB transmission requests) and, at block 435, préparé one or more OSIBs for transmission to the UE at 440 or 445. In some embodiments, the base station may préparé one or more OSIBs including the SI requested by the UE in the OSIB transmission request. Additionally or alternatively, the base station 105-c (and/or another network node with which the base station 20 communicates) may détermine what SI should be transmitted to the UE 115-b in an OSIB.

The base station 105-c and/or other network node may détermine what SI to transmit to the UE 115-b based on, for example, a UE identity, a UE type, capabilities information the base station has acquired for the UE, or other information known about (and potentially acquired from) the UE. In this manner, the amount of SI transmitted to the UE may be optimized, 25 which may help to conserve power, to free up resources, etc.

[0104] As previously indicated, an OSIB may include information équivalent to the information included in one or more ofthe LTE/LTE-A SIBs other than SIB1 or SIB2 (e.g., information to enable an operator to manage system sélection intra-RAT or inter-RAT, information for a UE to discover the availability and configuration(s) of one or more services). The information included in an OSIB may be numbered and organized based on SI fonction, in order to enable a base station to deliver information to a UE based on a subset of UE functions, based on UE capabilities, or based on UE service requirements (e.g., a base φ 27 station may not deliver multimedia broadcast multicast service (MBMS) information to a UE when the UE is not capable of using MBMS services). In some cases, information included in an OSIB may be numbered and organized the same or similar to information included in LTE/LTE-A SIBs.

[0105] Information included in an OSIB may be organized so that it may be efficiently received or processed by a UE. For example, the information may be organized so that a UE can read the information as infrequently as possible. In some embodiments, the information may be organized based on the scope of the information; based on whether the information applies system wide, intra-constellation, per cell or per zone; based on the duration for which information remains valid (e.g., validity time); or based on whether the information is semistatic or dynamic. When information changes very dynamically, the information may be organized so that it can be transmitted with reduced latency.

[0106] An on-demand transmission of an OSIB may be initiated by a UE (e.g., during initial access) or by an access network (e.g., when information included in the OSIB changes, 15 or when a dedicated SIB is transmitted).

[0107] As previously described, a base station may in some cases switch between an “ondemand unicast (or narrow-beam)” mode and an “always-on broadcast (or broad-beam)” or an “on-demand broadcast (or broad-beam)” mode for MSIB transmissions. A base station may also switch between an “on-demand unicast (or narrow-beam)” mode and an “always-on 20 broadcast (or broad-beam)”or an “on-demand broadcast (or broad-beam)” mode for OSIB transmissions. For “always-on broadcast (or broad-beam)” OSIB transmissions, an OSIB transmission schedule may be signaled in an MSIB transmission.

[0108] In some cases, a UE may receive and process an MSIB or OSIB based on a change in location ofthe UE. In some cases, the MSIB or OSIB may be received and processed after 25 transmitting a respective MSIB transmission request or OSIB transmission request. In this regard, FIG. 5 illustrâtes a Venn diagram 500 of respective coverage areas for a first zone 505, a second zone 510, a third zone 515, and a fourth zone 520. In some embodiments, the first zone 505 may include a 5G wireless communication network, the second zone 510 may include a first neighbor RAT (e.g., a neighbor RAT1), the third zone 515 may include a second neighbor RAT (e.g., a neighbor RAT2), and the fourth zone 520 may include a third neighbor RAT (e.g., a neighbor RAT3), in accordance with various aspects ofthe présent

disclosure. By way of example, the 5G wireless communication network may incorporate aspects ofthe wireless communication system 100 or 200 described with reference to FIGs. 1 or 2. Each ofthe first neighbor RAT, the second neighbor RAT, and the third neighbor RAT may also incorporate aspects ofthe wireless communication System 100 or 200. The 5G wireless communication network, first neighbor RAT, second neighbor RAT, and third neighbor RAT may also take different forms.

[0109] When a UE initially acquires access to a 5G wireless communication network in the first zone 505, or as a UE moves within the 5G wireless communication network, the UE may acquire SI for the first neighbor RAT, the second neighbor RAT, or the third neighbor RAT.

In some cases, a UE may acquire SI for the neighbor RATs using distance-based SI acquisition. A UE may employ distance-based SI acquisition by determining (e.g., calculating) a distance between the current location ofthe UE and a location ofthe UE when the UE last acquired neighbor RAT SI. When the determined distance exceeds a threshold distance, the UE may initiate a SI acquisition procedure (e.g., the UE may receive an OSIB containing the neighbor RAT SI, or the UE may transmit an OSIB transmission request in which the UE requests the neighbor RAT SI). The threshold distance may be configured by the network and may be indicated in an MSIB (e.g., as part of a measurement configuration indicated in the MSIB).

[0110] In some embodiments, distance-based SI acquisition may be employed on a per neighbor RAT basis. In other embodiments, distance-based SI acquisition may be employed on a collective neighbor RAT basis.

[0111] In some cases, a UE may receive and process an MSIB or OSIB based on a change in SI signaled in a periodic sync signal. In some cases, the MSIB or OSIB may be received and processed after transmitting a respective MSIB transmission request or OSIB transmission request.

[0112] FIG. 6 is a swim lane diagram 600 illustrating transmissions of a sync signal, an MSIB, and an OSIB by a base station 105-d, in accordance with various aspects ofthe présent disclosure. FIG. 6 also illustrâtes requests and réceptions ofthe MSIB and OSIB by a UE 115-c performing a system information update. In some examples, the base station 105-d 30 may incorporate aspects of one or more of the base stations 105 described with reference to φ 29

FIGs. 1,2, or 4. Similarly, the UE 115- c may incorporate aspects of one or more of the UEs 115 described with reference to FIGs. 1,2, or 4.

[0113] At 605, the base station may transmit an instance of a periodic sync signal, as described with reference to FIG. 3, or a paging message. The instance of the sync signal or paging message may include information (e.g., a modification flag or value tag) indicatîng that SI for a cell including the base station has changed.

[0114] In some embodiments, the instance of the sync signal or paging message may include a general indicator that SI has changed (e.g., a modification flag). The general indicator or modification flag may include, for example, a counter value that is incremented when SI has changed, or a Boolean variable (e.g., a binary value) that is set to TRUE (e.g., a logic “1”) when SI included in an MSIB has changed (or when the network expects a UE to re-acquire the MSIB) or FALSE (e.g., a logic “0”) when SI included in an MSIB has not changed (or when the network does not expect a UE to re-acquire the MSIB). The instance of the sync signal or paging message may also or altematively indicate whether certain éléments of SI hâve changed. For example, the instance of the sync signal or paging message may indicate whether SI for services such as Public Waming System (PWS; e.g., the Earthquake and Tsunami Waming System (ETWS) or the Commercial Mobile Alert System (CMAS)) has changed, which may simplify decoding and improve battery life when such information is changing more frequently.

[0115] The UE 115- c may receive the instance of the sync signal or paging message and, at block 610, process the instance of the sync signal or paging message (e.g., compare a counter value associated with the sync signal or paging message with a previously received counter value, or détermine whether a modification flag is set to TRUE or FALSE); détermine that SI for the cell or zone including the base station has changed; and (in some cases) détermine that the changed SI is relevant to the UE 115-c. The UE 115-c may also détermine that it needs to transmit an MSIB transmission request, at 615, to obtain an MSIB including the changed SI from the base station 105-d. The UE 115-c may also détermine, from the instance of the sync signal or paging message, where and when to transmit the MSIB transmission request and where and when to expect transmission ofthe MSIB by the 30 base station 105-d.

φ 30 [0116] At 620, the base station 105-d may transmit the MSIB. In some cases, the MSIB may include information indicating whether other SI has changed. For example, the MSIB may include a general indicator that other SI has changed (e.g., a modification flag). The general indicator or modification flag may include, for example, a counter value that is incremented when SI included in an OSIB has changed, or a Boolean variable (e.g., a binary value) that is set to TRUE (e.g., a logic “1”) when SI included in an OSIB has changed (or when the network expects a UE to re-acquire the OSIB) and to FALSE (e.g., a logic “0”) when SI included in an OSIB has not changed (or when the network does not expect a UE to re-acquire the OSIB). The MSIB may also or altematively indicate whether certain éléments of other SI hâve changed. For example, the MSIB may include a value tag per type of SI or équivalent LTE/LTE-A S IB (e.g., a first Boolean variable set to TRUE or FALSE to indicate whether SI for MBMS services has changed, a second Boolean variable set to TRUE or FALSE based on whether SI for PWS services (e.g., CMAS services or ETWS services) has changed, etc.).

[0117] The UE 115-c may receive the MSIB and, at block 625, process information included in the MSIB. The UE 115-c may use information indicating what SI has changed to détermine whether other SI useful to the UE (e.g., SI monitored by the UE) has changed and needs to be requested. For example, the UE may compare an OSIB counter value included in the MSIB with a previously received OSIB counter value, or détermine whether an OSIB modification flag is set to TRUE or FALSE, or compare value tags for one or more monitored éléments of other SI to previously received value tags for the one or more monitored éléments of other SI, to détermine with an OSIB needs to be requested. When other SI useful to the UE has not changed, the UE need not transmit an OSIB transmission request. However, when other SI useful to the UE has changed, the UE may préparé (e.g., at block 625) and transmit (e.g., at 630) an OSIB transmission request. In some cases, the OSIB transmission request may be a generic request (e.g., a request that causes the base station 105d to retum ail other SI, or a request that allows the base station 105-d to retum whatever SI the base station 105-d deems useful to the UE 115-c). In other cases, the OSIB transmission request may indicate what OSIB information is being requested. For example, a UE 115-c may indicate, in the OSIB transmission request, what SI (e.g., what type of SI or what SIBs) the UE 115-c would like to receive.

• 31 [0118] The base station 105-d may receive the OSIB transmission request and, at block 635, préparé one or more OSIBs for transmission to the UE 115-c at 640 or 645. In some embodiments, the base station 105-d may préparé an OSIB including the SI requested by the UE 115-c in the OSIB transmission request. Additionally or altematively, the base station

105-d (and/or another network node with which the base station 105-d communicates) may détermine what SI should be transmitted to the UE 115-c in an OSIB. The base station 105-d and/or other network node may détermine what SI to transmit to the UE 115-c based on, for example, a UE identity, a UE type, capabilities information the base station has acquired for the UE, or other information known about (and potentially acquired from) the UE. In this manner, the amount of SI transmitted to the UE may be optimized, which may help to conserve power, to free up resources, etc.

[0119] The below table provides an example allocation of SI between an MSIB and an OSIB in a 5G wireless communication system:

5G System Information
	Contents	Equivalent LTE/LTE-A SIBs
MSIB: Unicast (on-demand) SI, or SI broadcast with short periodicity	PHY layer basic configuration information (e.g., downlink bandwidth, SFN, etc.)	ΜΠ3
Constellation ID (PLMN ID, Constellation code, CSG/HNB ID), Constellation sélection information (qRxMin), FreqBand information, Scheduling information for other SIBs (if broadcast supported), SI value tag (may be signaled by sync signal)	SIB1
Access Class (AC)-Barring	SIB2

	info, Service Spécifie Access Control (SSAC) info, Extended Access Barring (EAB) Radio Common config (details: RACH (RACH preamble signatures), (Broadcast Control Channel (BCCH), paging Control Channel (PCCH)), PRACH, PDSCH, PUSCH, PUCCH, SRS, UEtimers and constants, Multimedia Broadcast Single Frequency Network (MBSFN) config, UL-Freq info + UL bandwidth, Time alignment timer
OSIB: Unicast (on-demand) SI, or SI broadcast with very long periodicity	Mobility related parameters, e.g., cell reselection parameters, neighbor constellation/zone lists, WLAN offloading signaling	SIB3-SIB8 SIB17
PWS, MBMS, GPS assistance data	SIB10-SIB16

[0120] Although each of FIGs. 4-6, and to some extent the remainder of the présent disclosure, focused primarily on the transmission of an MSIB or an OSIB, any number of MSIBs or OSIBs may be transmitted - either individually or in groups, and in response to a singular MSIB transmission request and/or OSIB transmission request, or in response to a 5 plurality of MSIB transmission requests and/or OSIB transmission requests. In some cases, master System information may distributed among one or more of an MSIB, an MTC_SIB, or other SIBs carrying master information. In some cases, other System information may be

distributed among one or more of an OSIB1 carrying neighbor cell/zone information, an 0SIB2 carrying MBMS related information, an 0SIB3 carrying PWS related information, or other SIBs carrying other information. An MSIB or OSIB may also include one or more éléments. When SI changes, a modification flag or value tag may be transmitted or received, 5 for example, per MSIB, per element within an MSIB, per OSIB, or per element within an OSIB.

[0121] FIG. 7 shows a block diagram 700 of a UE 115-d for use in wireless communication, in accordance with various aspects of the présent disclosure. The UE 115-d may be an example of aspects of one or more of the UEs 115 described with reference to

FIGs. 1-6. The UE 115-d may also be or include a processor. The UE 115-d may include a UE receiver module 710, an SI acquisition module 720, or a UE transmitter module 730. The SI acquisition module 720 may include an SI acquisition mode module 735, a UE SI request module 740, or an SI receipt module 745. Each of these modules may be in communication with each other.

[0122] The modules of the UE 115-d may, individually or collectively, be implemented using one or more application-specifîc integrated circuits (ASICs) adapted to perform some or ail of the applicable functions in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs,

Field Programmable Gâte Arrays (FPGAs), a System on Chip (SoC), or other Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application-specifîc processors.

[0123] In some examples, the UE receiver module 710 may include at least one radio frequency (RF) receiver. The UE receiver module 710 or RF receiver may be used to receive various types of data or control signais (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 described with reference to FIG. 1. As an example, the UE receiver module 710 may be used to receive a periodic sync signal, as described with reference to FIGs. 3 and 4. The UE receiver module 710 may also be used to receive various signais that include one or more forms of SI, as also described with reference to FIGs. 3 and

4. The receipt and processîng of the synchronization signais and the SI signais (for example, the periodic sync signais 310, 335, 360, or 385 of FIG. 3, and the broadeast MSIBs 315, 340, 365, or the unicast MSIB 390 of FIG. 3) may be additionally facilitated through the SI acquisition module 720, as described in greater detail below.

[0124] In some examples, the UE transmitter module 730 may include at least one RF transmitter. The UE transmitter module 730 or RF transmitter may be used to transmit various types of data or control signais (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links ofthe wireless communication system 100 described with reference to FIG. 1. As an example, the

UE transmitter module 730 may be used to transmit an MSIB transmission request signal 345, 370, 395, as described with reference to FIG. 3. The transmission of the MSIB transmission request signais 345, 370, 395, for example, may be additionally facilitated through the SI acquisition module 720, as described in greater detail below.

[0125] The SI acquisition module 720 may be used to manage one or more aspects of wireless communication for the UE 115-d. In particular, in the UE 115-d, the SI acquisition module 720 may be used to facilitate the acquisition of SI from a base station 105, in accordance to aspects of some ofthe embodiments described above. The SI acquisition module 720 may include an SI acquisition mode module 735, a UE SI request module 740, or an SI receipt module 745.

[0126] The SI acquisition mode module 735 may be used by the UE 115-d to facilitate receipt by the UE 115-d of a periodic sync signal 310, 335, 360, 385, as illustrated in FIGs. 3 and 4, for example. The received periodic sync signal 310, 335,360, 385 may indicate to the UE 115-d whether the UE 115-d is to transmit a request signal, such as an MSIB transmission request signal 345, 370, 395, for example, in order to receive a transmission of SI. For example, the UE 115-d may receive a periodic sync signal 310 that indicates to the UE 115-d that SI may be broadeast by a base station 105 regardless of any requests sent by the UE 115d. In this instance, the SI acquisition mode module 735 may détermine that no request is necessary in order for the UE 115-d to receive SI. In another example, however, the UE 115d may receive a periodic sync signal 335, 360, 385, which may each indicate that the UE 11530 d is to transmit a request for SI (in the form of an MSIB transmission request signal 345, 370, 395, for example) in order to receive SI. In this instance, the SI acquisition mode module 735 may détermine that a request is necessary in order for the UE 115-d to receive SI. Thus, the

SI acquisition mode module 735 may be configured to détermine whether the UE 115-d is operating in a network having a broadcast SI mode or an on-demand SI mode.

[0127] In the event that the UE 115-d is operating in a network using an on-demand SI mode, meaning that the UE 115-d is to transmit a request to receive SI, the UE SI request module 740 may be used to facilitate the création of such a request. As an example, the UE SI request module 740 may be used to formulate any one of the MSIB transmission request signais 345, 370,395 of FIG. 3. The UE SI request module 740 may use information included with the periodic sync signal 335,360,385 to détermine how to formulate the MSIB transmission request signais 345,370, 395. For example, the periodic sync signal 335,360,

385 may include information indicating where the MSIB transmission request signais 345,

370,395 should be sent, as well as the timing of such signais.

[0128] The SI receipt module 745 may be used to facilitate the receipt of SI transmitted to the UE 115-d. The SI may be transmitted as a broadcast without any need for a request sent by the UE 115-d. In this example, the SI acquisition mode module 735 may indicate to the SI receipt module 745 that SI is to be received via a broadcast. The SI receipt module 745 may then facilitate receipt ofthe SI using information included with the periodic sync signal 310, such as a predetermined channel or timing of the SI broadcast. In another example, the SI may be transmitted as either a broadcast or a unicast in response to a request sent by the UE 115-d. In these examples, the SI acquisition mode module 735 may indicate to the SI receipt module 745 that SI is to be received as either a broadcast or a unicast in response to a request. The SI receipt module 745 may then facilitate receipt of the SI using information included with the periodic sync signais 335, 360, 385, such as a predetermined channel or timing of the SI broadcast or unicast.

[0129] FIG. 8 shows a block diagram 800 of a UE 115-e for use in wireless communication, in accordance with various examples. The UE 115-e may be an example of one or more aspects of a UE 115 described with reference to FIGs. 1-7. The UE 115-e may include a UE receiver module 710-a, an SI acquisition module 720-a, and/or a UE transmitter module 730-a, which may be examples of the corresponding modules of UE 115-d (of FIG.

7). The UE 115-e may also include a processor (not shown). Each of these components may be in communication with each other. The SI acquisition module 720-a may include an SI acquisition mode module 735-a, a UE SI request module 740-a, and/or an SI receipt module 745-a. The SI acquisition mode module 735-a may further include a sync signal receipt

module 805 and/or an SI acquisition mode détermination module 810. The UE receiver module 710-a and the UE transmitter module 730-a may perform the fonctions of the UE receiver module 710 and the UE transmitter module 730, of FIG. 7, respectively.

[0130] The modules of the UE 115-e may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail of the applicable functions in hardware. Altematively, the fonctions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a System on a Chip (SoC), or other Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application-specific processors.

[0131] The SI acquisition mode module 735-a may include a sync signal receipt module 805 and/or an SI acquisition mode détermination module 810. The sync signal receipt module 805 may be used by the UE 115-e to facilitate receipt by the UE 115-e of a periodic sync signal 310,335, 360, 385, as illustrated in FIGs. 3 and 4, for example. The received periodic sync signal 310, 335, 360,385 may indicate to the UE 115-e whether the UE 115-e is to transmit a request signal, such as an MSIB transmission request signal 345, 370, 395, for example, in order to receive a transmission of SI. Thus, the SI acquisition mode détermination module 810 may be used to détermine, from the received periodic sync signal 310, 335, 360, 385, whether an SI acquisition mode is a fixed periodic mode or an on-demand mode. For example, the UE 115-e, through the sync signal receipt module 805, may receive a periodic sync signal 310 that indicates to the UE 115-e that SI may be broadcast by a base station 105 regardless of any requests sent by the UE 115-e. In this instance, the SI acquisition mode détermination module 810 may détermine that no request is necessary in order for the UE 115-e to receive SI. In another example, however, the UE 115-e may receive, via the sync signal receipt module 805, a periodic sync signal 335, 360,385, which may each indicate that the UE 115-e is to transmit a request for SI (in the form of an MSIB transmission request signal 345,370, 395, for example) in order to receive SI. In this instance, the SI acquisition mode détermination module 810 may détermine that a request is necessary in order for the UE 115-e to receive SI. Thus, the SI acquisition mode

37 détermination module 810 may be configured to détermine whether the UE 115-e is operating in a network having a fixed broadcast SI mode or an on-demand SI mode.

[0132] In the event that the UE 115-e is operating in a network using an on-demand SI mode, meaning that the UE 115-e is to transmit a request to receive SI, the UE SI request module 740-a may be used to facilitate the création of such a request. As an example, the UE SI request module 740-a may be used to formulate any one of the MSIB transmission request signais 345,370,395 of FIG. 3. The UE SI request module 740-a may use information included with the periodic sync signal 335,360,385 to détermine how to formulate the MSIB transmission request signais 345, 370, 395. For example, the periodic sync signal 335,360,

385 may include information indicating where the MSIB transmission request signais 345,

370,395 should be sent, as well as the timing of such signais.

[0133] The SI receipt module 745-a may be used to facilitate the receipt of SI transmitted to the UE 115-e. The SI may be transmitted as a broadcast without any need for a request sent by the UE 115-e. In this example, the SI acquisition mode module 735-a may indicate to the SI receipt module 745-a that SI is to be received via a broadcast. The SI receipt module 745-a may then facilitate receipt ofthe SI using information included with the periodic sync signal 310, such as a predetermined channel or timing of the SI broadcast. The UE 115-e may receive the SI, in some examples, by monîtoring an SI-RNTI on a common physical control channel (e.g., a PDCCH), decoding a downlink assignaient message associated with the SI-RNTI, and receiving the SI on a shared channel (e.g., a PDSCH).

[0134] In another example, the SI may be transmitted as either a broadcast or a unicast in response to a request sent by the UE 115-e. In these examples, the SI acquisition mode module 735-a may indicate to the SI receipt module 745-a that SI is to be received as either a broadcast or a unicast in response to a request. The SI receipt module 745-a may then facilitate receipt of the SI using information included with the periodic sync signais 335,360, 385, such as a predetermined channel or timing ofthe SI broadcast or unicast. The UE 115-e may receive the SI, in some examples, by monîtoring an SI-RNTI on a common physical control channel (e.g., a PDCCH), decoding a downlink assignaient message associated with the SI-RNTI, and receiving the MSIB on a shared channel (e.g., a PDSCH). Alternatively, when an RNTI (e.g., a C-RNTI or Z-RNTI) is assigned for the UE 115-e, the UE 115-e may monitor the RNTI on a common physical control channel (e.g., a PDCCH), décodé a downlink assignment message associated with the RNTI, and receive the SI on a shared

channel (e.g., a PDSCH) according to information contained in the downlink assignment message. In another alternative, the UE 115-e may monitor an SI-RNTI in order to receive broadeast SI, while the UE may also use an RNTI dedicatedly allocated for the UE (e.g., CRNTI or zone RNTI) to receive unicast SI.

[0135] In each of the examples described above with respect to the UEs 115-d, 115-e of

FIGs. 7 and 8, the terms broadeast operation and broad-beam operation may be used interchangeably, at the level at which operations of UEs 115-d, 115-e hâve been described. Similarly, the terms unicast operation and narrow-beam operation may be used interchangeably, at the level at which operations of UEs 115-d, 115-e hâve been described.

In general, if the UE 115-d, 115-e is operating in a massive ΜΙΜΟ network, the UE 115-d, 115-e may receive the periodic sync signal 310, 335,360,385 as part of a broad-beam operation, and may receive the SI as part of either a broad-beam or a narrow-beam operation. On the other hand, if the UE 115-d, 115-e is operating in a non-massive ΜΙΜΟ network, the UE 115-d, 115-e may receive the periodic sync signal 310, 335, 360, 385 as part of a broadeast operation, and may receive the SI as part of either a broadeast or a unicast operation.

[0136] FIG. 9 shows a block diagram 900 of a UE 115-f for use in wireless communication, in accordance with various aspects of the présent disclosure. The UE 115-f may be an example of aspects of one or more of the UEs 115 described with reference to

FIGs. 1-8. The UE 115-f may include a UE receiver module 710-b, an SI acquisition module 720-b, and/or a UE transmitter module 730-b, which may be examples of the corresponding modules of UE 115-d (of FIG. 7). The UE 115-f may also include a processor (not shown). Each of these components may be in communication with each other. The SI acquisition module 720-b may include a master SI acquisition module 905, an SI processing module 910, a UE SI request module 915, and/or another SI acquisition module 920. The UE receiver module 710-b and the UE transmitter module 730-b may perform the fonctions of the UE receiver module 710 and the UE transmitter module 730, of FIG. 7, respectively. In addition, the UE receiver module 710-b may be used to receive SI signais such as the OSIB 440,445, 640, or 645 of FIGs. 4 and 6; and the UE transmitter module 730-b may be used to transmit

SI signais such as the MSIB transmission request signal 345, 370, 395,415, or 615 of FIGs. 3,4, and 6, or the OSIB transmission request 430 or 630 of FIGs. 4 and 6.

[0137] The modules of the UE 115-e may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail of the applicable fonctions in hardware. Altematively, the fonctions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The fonctions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0138] The master SI acquisition module 905 may be used to receive a first set of system information (e.g., master system information, such as the master system information included in the MSIB received at 420 in FIG. 4).

[0139] The SI processing module 910 may be used to détermine, based at least in part on the first set of system information, that additional system information (e.g., non-master 15 system information, such as the other system information described with reference to FIG. 4) is available.

[0140] The UE SI request module 915 may be used to transmit a request (e.g., the OSIB transmission request transmitted at 430 in FIG. 4) for the additional system information. In some examples, the UE SI request module 915 may transmit a plurality of requests for the 20 additional system information. In some examples, a single OSIB transmission request may indicate one or a plurality of éléments of additional system information that the UE 115-f would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of additional system information that the UE 115-f would like to receive). In other examples, the UE 115-f may request some types of additional system 25 information in different OSIB transmission requests, and the UE SI request module 915 may be used to transmit a plurality of OSIB transmission requests.

[0141] The other SI acquisition module 920 may be used to receive the additional system information (e.g., to receive the other system information included in the OSIB received at 440 or 445 in FIG. 4).

[0142] In some embodiments, receiving the first set of system information using the master

SI acquisition module 905 may include receiving an indication of one or more sets of

additional system information that are available. In some embodiments, transmitting the request for the additional system information using the UE SI request module 915 may include identifying, in the request for the additional system information, one or more sets of additional system information. In some embodiments, the one or more sets of additional system information identified in the request for the additional system information may include one or more sets of additional system information indicated in the first set of system information.

[0143] In some embodiments, receiving the additional system information using the other SI acquisition module 920 may include at least one of: receiving system information indicating which RATs are available in a région and how the UE 115-f is to select an available RAT (e.g., UE mobility rules and policies); receiving system information indicating which services are available in a région and how the UE 115-f is to obtain an available service; receiving system information relating to an MBMS or a PWS service; receiving system information relating to location, positioning, or navigation services; or receiving system information based at least in part on a determined location of the UE 115-f.

[0144] In some embodiments, transmitting the request for additional system information using the UE SI request module 915 may include including one or more capabilities ofthe UE in the request. In these embodiments, receiving the additional system information using the other SI acquisition module 920 may include receiving system information based at least 20 in part on the one or more capabilities ofthe UE 115-f included in the request.

[0145] In some embodiments, transmitting the request for additional system information using the UE SI request module 915 may include including a location of the UE 115-f in the request. In these embodiments, receiving the additional system information using the other SI acquisition module 920 may include receiving system information based at least in part on 25 the location of the UE 115-f included in the request.

[0146] In some embodiments, transmitting the request for additional system information using the UE SI request module 915 may include including an identification ofthe UE 115-f in the request. In these embodiments, receiving the additional system information using the other SI acquisition module 920 may include receiving system information based at least in 30 part on the identification of the UE 115-f included in the request.

φ 41 [0147] FIG. 10 shows a block diagram 1000 of a UE 115-g for use în wireless communication, in accordance with various aspects of the présent disclosure. The UE 115-g may be an example of aspects of one or more of the UEs 115 described with reference to FIGs. 1-9. The UE 115-g may include a UE receiver module 710-c, an SI acquisition module 5 720-c, and/or a UE transmitter module 730-c, which may be examples of the corresponding modules of UE 115-d or 115-f (of FIGs. 7 or 9). The UE 115-g may also include a processor (not shown). Each of these components may be in communication with each other. The SI acquisition module 720-c may include a sync signal processing module 1005, a master SI acquisition module 905-a, an SI processing module 910-a, a UE SI request module 915-a, or 10 another SI acquisition module 920-a. The UE receiver module 710-c and the UE transmitter module 730-c may perform the functions of the UE receiver module 710 and the UE transmitter module 730, of FIGs. 7 or 9, respectively.

[0148] The modules of the UE 115-g may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail of the applicable functions in 15 hardware. Altematively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions 20 embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0149] The sync signal processing module 1005 may be used to décodé information received from a downlink channel. The decoded information may indicate that master system information (e.g., an MSIB) is received in response to a master system information request (e.g., an MSIB transmission request such as the MSIB transmission request transmitted at 415 in FIG. 4). In some examples, the downlink channel may include a synchronization signal (e.g., the instance of the periodic sync signal received at 405 in FIG. 4). The decoded information may include information decoded from the synchronization signal.

[0150] The UE SI request module 915-a may be used to transmit a master system information request in accordance with the information decoded from the downlink channel by the sync signal processing module 1005.

[0151] The master SI acquisition module 905-a may be used to receive the master System information (e.g., the master System information included in the MSIB received at 420 in FIG. 4). The master System information may include System information that allows the UE 115-g to perform an initial access of a network using one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or a network access configuration.

[0152] The SI processing module 910-a may be used to détermine, based at least in part on the master System information, that additional System information (e.g., non-master System information, such as the other System information described with reference to FIG. 4) is available.

[0153] The UE SI request module 915-a may also be used to transmit a request (e.g., the OSIB transmission request transmitted at 430 in FIG. 4) for the additional System information. In some examples, the UE SI request module 915-a may transmit a plurality of requests for the additional System information. In some examples, a single OSIB transmission request may indicate one or a plurality of éléments of additional System information that the UE 115-g would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of additional system information that the UE 115-g would like to receive). In other examples, the UE 115-g may request some types of additional system information in different OSIB transmission requests, and the UE

SI request module 915-a may be used to transmit a plurality of OSIB transmission requests.

[0154] The other SI acquisition module 920-a may be used to receive the additional system information (e.g., to receive the other system information included in the OSIB received at 440 or 445 in FIG. 4).

[0155] In some embodiments, receiving the master system information using the master SI 25 acquisition module 905-a may include receiving an indication of one or more sets of additional system information that are available. In some embodiments, transmitting the request for the additional system information using the UE SI request module 915-a may include identifying, in the request for the additional system information, one or more sets of additional system information. In some embodiments, the one or more sets of additional system information identified in the request for the additional system information may

include one or more sets of additional System information indicated in the master System information.

[0156] FIG. 11 shows a block diagram 1100 of a UE 115-h for use in wireless communication, in accordance with various aspects of the présent disclosure. The UE 115-h may be an example of aspects of one or more of the UEs 115 described with reference to FIGs. 1-10. The UE 115-h may include a UE receiver module 710-d, an SI acquisition module 720-d, or a UE transmitter module 730-d, which may be examples of the corresponding modules of UE 115-d (of FIG. 7). The UE 115-h may also include a processor (not shown). Each of these components may be in communication with each other. The SI acquisition module 720-d may include a signal processing module 1105 or a UE SI request module 1110. The UE receiver module 710-d and the UE transmitter module 730-d may perform the fùnctions of the UE receiver module 710 and the UE transmitter module 730, of FIG. 7, respectively. In addition, the UE receiver module 710-d may be used to receive SI signais such as the OSIB 440,445, 640, or 645 of FIGs. 4 and 6, a value tag associated with

SI, or a zone identifier; and the UE transmitter module 730-d may be used to transmit SI signais such as the MSIB transmission request signal 345, 370, 395,415, or 615 of FIGs. 3,4, and 6, or the OSIB transmission request 430 or 630 of FIGs. 4 and 6.

[0157] The modules of the UE 115-h may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail ofthe applicable fùnctions in hardware. Altematively, the fonctions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The fonctions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0158] The signal processing module 1105 may be used to receive a first signal (e.g., a sync signal or paging message such as the instance ofthe periodic sync signal or paging message received at 605 in FIG. 6 or the MSIB received at 620 in FIG. 6). In some cases, the signal processing module 1105 may receive the first signal while the UE 115-h is communicating with a network using a first System information. The signal processing

module 1105 may also be used to détermine, based at least in part on the first signal, to request updated system information.

[0159] The UE SI request module 1110 may be used to request updated system information (e.g., to transmit the MSIB transmission request transmitted at 615 in FIG. 6 or the OSIB transmission request transmitted at 630 in FIG. 6) based at least in part on the détermination made by the signal processing module 1105.

[0160] In some embodiments, determining to request the updated system information using the signal processing module 1105 may include at least one of: identifying that the UE 115-h has moved into a zone using second system information that is different from the first system 10 information; identifying that the network has changed at least a portion of the first system information; or identifying that the UE 115-h has moved more than a predetermined distance from a location where the UE 115-h obtained the first system information a previous time (e.g., from the location where the UE obtained the first system information last time).

[0161] In some embodiments, receiving the first signal using the signal processing module 15 1105 may include receiving a zone identifier (e.g., an area code, a BSIC, or another cell identifier). In some cases, the zone identifier may be received as part of a synchronization signal. In some cases, the zone identifier may be transmitted as part of a synchronization signal. In some cases, the zone identifier may identify one of the neighbor RATs of zones 510, 515, or 520 described with reference to FIG. 5. In these embodiments, the signal processing module 1105 may use the zone identifier to identify that the UE 115-h has moved from a first zone to a second zone. In some embodiments, determining to request updated system information using the signal processing module 1105 may include identifying a distance between a current location ofthe UE 115-h and a location where the UE 115-h obtained the first system information a previous time (e.g., the last time), and determining that the identified distance exceeds a predetermined threshold. In some cases, the predetermined threshold may be received from the network. In some cases, a location signal identifying a location of the UE 115-h may also be received. The location signal may be received, for example, as part of receiving the first signal. The location signal may also be received in other ways, such as via a Global Navigation Satellite System (GNSS; e.g., GPS,

Galileo, GLONASS or BeiDou).

[0162] FIG. 12 shows a block diagram 1200 of a UE 115-i for use in wireless communication, in accordance with various aspects of the présent disclosure. The UE 115-i may be an example of aspects of one or more of the UEs 115 described with reference to FIGs. 1-11. The UE 115-i may include a UE receiver module 710-e, an SI acquisition module 720-e, or a UE transmitter module 730-e, which may be examples of the corresponding modules of UE 115-d or 115-h (of FIGs. 7 or 11). The UE 115-i may also be or include a processor (not shown). Each of these components may be in communication with each other. The SI acquisition module 720-e may include a signal processîng module 1105-a or a UE SI request module 1110-a. The UE receiver module 710-e and the UE transmitter module 730-e may perform the functions of the UE receiver module 710 and the

UE transmitter module 730, of FIGs. 7 or 11, respectively.

[0163] The modules of the UE 115-i may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail of the applicable functions in hardware. Altematively, the functions may be performed by one or more other processîng units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application20 spécifie processors.

[0164] The signal processîng module 1105-a may be used to receive a first signal (e.g., a sync signal or paging message such as the instance ofthe periodic sync signal or paging message received at 605 in FIG. 6 or the MSIB received at 620 in FIG. 6). In some cases, the signal processîng module 1105-a may receive the first signal while the UE 115-i is communicating with a network using first system information, and the first signal may include an indication that at least a portion of the first system information has changed.

[0165] The signal processîng module 1105-a may include a modification flag or value tag processîng module 1205. The modification flag or value tag processîng module 1205 may be used, in some examples, to receive one or more modification flags, each of which indicates, 30 by a counter value or Boolean variable (e.g., a binary value), that a corresponding portion of the first system information has changed. In some examples, the corresponding portion of the first system information may include a portion of master system information, such as an

MSIB or element of an MSIB, In other examples, the corresponding portion ofthe first system information may include additional non-master system information, such as an OSIB or element of an OSIB. The master system information may include one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. The master system information may also or altematively include, for example, one or more other éléments of the master system information described with reference to FIG. 3. The additional non-master System information may include one or more éléments of the other system information described with reference to FIG. 4 or 6. In some embodiments, the modification flag may be received with (or as a part of) the first signal.

[0166] The modification flag or value tag processing module 1205 may also be used, in some examples, to receive one or more value tags corresponding to at least a portion (or different portions) of the first system information that has/have changed. In some examples, the one or more value tags may correspond to one or more portions of master system information (e.g., one or more MSIBs, or one or more éléments of one or more MSIBs), one or more portions of additional non-master system information (e.g., one or more OSIBs, or one or more éléments of one or more OSIBs), or a combination thereof. The master system information may include one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. The master system information may also or altematively include, for example, one or more other éléments of the master system information described with reference to FIG. 3. The additional non-master system information may include one or more éléments of the other system information described with reference to FIG. 4 or 6. In some embodiments, one or more value tags may be received with (or as part of) the first signal.

[0167] The signal processing module 1105-a or modification flag or value tag processing module 1205 may also be used to détermine, based at least in part on the first signal, a modification flag included in the first signal, or one or more value tags included in the first signal, to request updated system information. In some cases, determining to request updated system information may include determining a received modification flag is set to TRUE. In some cases, determining to request updated system information may include comparing a received value tag with a previously received value tag), and determining to request the

updated System information based at least in part on the comparison (e.g., determining to request the updated System information when the value tags do not match).

[0168] The UE SI request module 1110-a may be used to request updated System information based at least in part on the détermination made by the signal processing module

1105-a (e.g., to transmit the MSIB transmission request at 615 in FIG. 6 or to transmit the

OSIB transmission request at 630 in FIG. 6).

[0169] FIG. 13 shows a block diagram 1300 of a UE 115-j for use in wireless communication, in accordance with various aspects of the présent disclosure. The UE 115-j may hâve various configurations and may be included or be part of a personal computer (e.g., a laptop computer, a netbook computer, a tablet computer, etc.), a cellular téléphoné, a Smart phone, a PDA, a wireless modem, a USB dongle, a wireless router, a digital video recorder (DVR), an internet appliance, a gaming console, an e-reader, etc. The UE 115-j may, in some examples, hâve an internai power supply (not shown), such as a small battery, to facilitate mobile operation. In some examples, the UE 115-j may be an example of aspects of one or more of the UEs 115 described with reference to FIGs. 1-12. The UE 115-j may be configured to implement at least some of the UE features and functions described with reference to FIGs. 1-12.

[0170] The UE 115-j may include a UE processor module 1310, a UE memory module 1320, at least one UE transceiver module (represented by UE transceiver module(s) 1330), at 20 least one UE antenna (represented by UE antenna(s) 1340), or SI acquisition module 720-f.

Each of these components may be in communication with each other, directly or indirectly, over one or more buses 1335.

[0171] The UE memory module 1320 may include random access memory (RAM) or readonly memory (ROM). The UE memory module 1320 may store computer-readable, computer-executable code 1325 containing instructions that are configured to, when executed, cause the UE processor module 1310 to perform various functions described herein related to wireless communication, including, for example, transmissions of a pilot signal. Altematively, the code 1325 may not be directly exécutable by the UE processor module 1310 but be configured to cause the UE 115-j (e.g., when compiled and executed) to perform 30 various of the functions described herein.

[0172] The UE processor module 1310 may include an intelligent hardware device, e.g., a central processing unit (CPU), a microcontroller, an ASIC, etc. The UE processor module 1310 may process information received through the UE transceiver module(s) 1330 or information to be sent to the UE transceiver module(s) 1330 for transmission through the UE antenna(s) 1340. The UE processor module 1310 may handle various aspects of communicating over (or managing communications over) a wireless medium.

[0173] The UE transceiver module(s) 1330 may include a modem configured to modulate packets and provide the modulated packets to the UE antenna(s) 1340 for transmission, and to demodulate packets received from the UE antenna(s) 1340. The UE transceiver module(s) 10 1330 may, in some examples, be implemented as one or more UE transmitter modules and one or more separate UE receiver modules. The UE transceiver module(s) 1330 may support communications on one or more wireless channels. The UE transceiver module(s) 1330 may be configured to communicate bi-directionally, via the UE antenna(s) 1340, with one or more base stations, such as one or more ofthe base stations 105 described with reference to FIG. 1, 15 2, 4, or 6. While the UE 115-j may include a single UE antenna, there may be examples in which the UE 115-j may include multiple UE antennas 1340.

[0174] The UE state module 1350 may be used, for example, to manage transitions of the UE 115-j between RRC connected states, and may be in communication with other components of the UE 115-j, directly or indirectly, over the one or more buses 1335. The UE 20 state module 1350, or portions of it, may include a processor, and/or some or ail of the fonctions ofthe UE state module 1350 may be performed by the UE processor module 1310 or in connection with the UE processor module 1310.

[0175] The SI acquisition module 720-f may be configured to perform or control some or ail of the system information acquisition features or fonctions described with reference to 25 FIGs. 1-12. The SI acquisition module 720-f, or portions of it, may include a processor, or some or ail of the fonctions of the SI acquisition module 720-f may be performed by the UE processor module 1310 or in connection with the UE processor module 1310. In some examples, the SI acquisition module 720-f may be an example of the SI acquisition module 720 described with reference to FIGs. 7-12.

[0176] FIG. 14 shows a block diagram 1400 of a base station 105-e for wireless communication, in accordance with various aspects of the présent disclosure. The base

station 105-e may be an example of one or more aspects of a base stations 105 described with reference to FIGs. 1-6. The base station 105-e may also be or include a processor. The base station 105-e may include a base station (or RRH) receiver module 1410, an SI transmission module 1420, or a base station (or RRH) transmitter module 1430. The SI transmission module 1420 may include an SI transmission mode module 1435, a base station SI request module 1440, or an SI transmit module 1445. Each of these modules may be in communication with each other. In configurations ofthe base station 105-e including one or more RRHs, aspects of one or more of the modules 1410,1420, or 1430 may be moved to each of the one or more RRHs.

[0177] The base station 105-e, through the base station receiver module 1410, the SI transmission module 1420, and/or the base station transmitter module 1430, may be configured to perform aspects of the fonctions described herein. For example, the base station 105-e may be configured to détermine an SI transmission mode, receive requests for SI (from a UE 115, for example), and transmit the SI in accordance with one or more of the received requests and the determined transmission modes, as described in greater detail herein.

[0178] The components of the base station 105-e may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail ofthe applicable fonctions in hardware. Altematively, the fonctions may be performed by one or more other 20 processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The fonctions of each component may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application25 spécifie processors.

[0179] In some examples, the base station receiver module 1410 may include at least one RF receiver. The base station receiver module 1410 or RF receiver may be used to receive various types of data or control signais (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links ofthe wireless communication system 100 described with reference to FIG. 1. As an example, the base station receiver module 1410 may be used to receive an MSIB transmission request signal 345, 370,395, as described with reference to FIG. 3. The receipt and processing ofthe

SI request signais (for example, the MSIB transmission request signal 345, 370, 395 of FIG. 3) may be addîtionally facilitated through the SI transmission module 1420, as described in greater detail below.

[0180] In some examples, the base station transmitter module 1430 may include at least one RF transmitter. The base station transmitter module 1430 or RF transmitter may be used to transmit various types of data or control signais (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 described with reference to FIG. 1. As an example, the base station transmitter module 1430 may be used to transmit a periodic sync signal 310, 335, 360, or 385, as described with reference to FIG. 3. The base station transmitter module 1430 may also be used to transmit various signais that include one or more forms of SI, such as the broadcast MSIBs 315, 340, 365, or the unicast MSIB 390, as also described with reference to FIG. 3. The transmission ofthe synchronization signais and the SI signais may be addîtionally facilitated through the SI transmission module 1420, as described in greater detail below.

[0181] The SI transmission module 1420 may be used to manage one or more aspects of wireless communication for the base station 105-e. In particular, the SI transmission module 1420 may be used to facilitate the transmission of SI from the base station 105-e, in accordance to aspects of some of the embodiments described above. The SI transmission module 1420 may include an SI transmission mode module 1435, a base station SI request module 1440, or an SI transmit module 1445.

[0182] The SI transmission mode module 1435 may be used by the base station 105-e to facilitate détermination by the base station 105-e of an SI transmission mode and transmission by the base station 105-e of a periodic sync signal 310, 335, 360, 385, as illustrated in FIG. 3, for example. Examples of the different transmission modes may be illustrated and described above with relation to FIG. 3. For example, one transmission mode may include an SI broadcast having fixed periodic schedulîng and targeting a cell edge, as illustrated in the transmission/reception timeline 305 of FIG. 3. In this example, the base station 105-e may transmit a periodic sync signal 310 which may indicate to UEs 115 that SI information is to be periodically broadcast without the need for the UEs 115 to transmit a spécifie request for SI. This SI transmission mode may be benefïcially used when many UEs 115 are requesting SI. Because the SI transmission is a broadcast, the number of UEs 115

requiring SI will hâve no effect on the transmission of SI. However, this SI transmission mode may also include some drawbacks. Namely, a broadcast that targets a cell edge may require a significant transmission power and thus may resuit in radio resource wastage if the number of UEs 115 camped on the cell or zone is low. Additionally, in this transmission 5 mode, the base station 105-e may broadcast SI regardless of the number of UEs 115 camped on the cell or zone. Even if no UEs 115 are camped on the cell or zone, the base station 105e may continue to broadcast SI, thus resulting in resource wastage and possible interférence.

[0183] Another transmission mode may include an SI broadcast having an on-demand periodic scheduling and that targets a cell edge, as illustrated in the transmission/reception timeline 330 of FIG. 3. In this example, the base station 105-e may transmit a periodic sync signal 335 which may indicate to UEs 115 that SI information is to be periodically broadcast in response to an MSIB transmission request signal 345. This SI transmission mode may be beneficially used such that the base station 105-e is not required to perform resource allocation and data scheduling on a per UE basis but can just continue a periodic broadcast.

Additionally, if no UEs 115 are requesting SI, the base station 105-e may discontinue its broadcasts in order to save energy and reduce interférence. Conversely, the broadcast targeting of a cell edge may still require a significant power usage, which may still resuit in power wastage and possible interférence.

[0184] Yet another transmission mode may include an SI broadcast having an on-demand 20 aperiodic scheduling and that targets a group of UEs 115, as illustrated in the transmission/reception timeline 355 of FIG. 3. In this example, the base station 105-e may transmit a periodic sync signal 360 which may indicate to UEs 115 that SI information is to be aperiodically broadcast in response to an MSIB transmission request signal 370. This SI transmission mode may be beneficially used such that the base station 105-e is able to stop SI 25 broadcasts when no UEs are requesting SI, thus saving energy and reducing possible interférence. Additionally, because the base station 105-e is targeting only a group of UEs

115 (instead of a cell edge), less transmission power is required. However, in this transmission mode, the base station 105-e may be required to optimize SI transmission for groups ofUEs, thus potentially levying a higher processing load. Additionally, this mode is 30 still not as efficient as unicast transmission, though efficiency may dépend on a number of

UEs 115 requesting SI.

[0185] A fourth transmission mode may include an SI unicast having on-demand aperiodic scheduling and that targets a single UE 115, as illustrated in the transmission/reception timeline 380 of FIG. 3. In this example, the base station 105-e may transmit a periodic sync signal 385 which may indicate to UEs 115 that SI information is to be aperiodically unicast in response to an MSIB transmission request signal 395. This SI transmission mode has benefits of allowing the base station 105-e to stop SI transmission when no UEs 115 are requesting SI, and can provide high efficiency in providing SI to UEs 115. This mode may, however, hâve an accompanying increase in processing loads at the base station 105-e.

[0186] The transmission modes described above hâve been generally described using the terms broadcast and unicast, which may be most appropriately used when the network in which the base station 105-e is participating is a non-massive ΜΙΜΟ network. On the other hand, if a massive ΜΙΜΟ environment is configured, broad-beam and narrow-beam transmissions may be used in place of broadcast or unicast transmissions. A broad-beam transmission may provide wide coverage which can serve more than one UE 115, though a broad-beam transmission may require addîtional radio resources with respect to a narrowbeam transmission which serves only a single UE 115.

[0187] In general, a broad-beam or broadcast operation offers better efficiency in situations where there are many UEs 115 attempting to acquire SI, while a narrow-beam or unicast operation offers better efficiency in situations where there are a smaller number of UEs 115 20 attempting to acquire SI.

[0188] The SI transmission mode module 1435 may facilitate a transition between transmission modes, for example. One implémentation may include the changing of transmission modes based on a number of UEs 115 requesting SI acquisition, network load, congestion status, or available radio resources.

[0189] F or example, in a non-massive ΜΙΜΟ situation, if the number of UEs 115 requesting SI acquisition is greater than a predetermined threshold number N, then the SI transmission mode module 1435 may détermine to include an indicator in a periodic sync signal 310 that indicates that the SI will be periodically broadcast (e.g., the indicator may indicate that SI transmission is fixed). In this situation, the base station 105-e may periodically broadcast the SI without requiring a spécifie SI request from a UE 115, and UEs φ 53

115 may acquire the SI by monitoring an SI-RNTI and/or an RNTI assigned for the concemed UE (e.g., a C-RNTI/Z-RNTI) if présent, for example, and as described above.

[0190] If, however, in the non-massive ΜΙΜΟ situation, the number of UEs 115 requesting SI acquisition is not greater than or equal to the predetermined threshold number N or is smaller than the predetermined the threshold number N2, the SI transmission mode module 1435 may détermine to include an indicator in a periodic sync signal 335,360,385 that indicates that the SI will be transmitted in response to a request (e.g., the indicator may indicate that SI transmission is on-demand). In this situation, the base station 105-e may transmit the SI in response to a spécifie SI request from a UE 115, and UEs 115 may acquire the SI by monitoring an SI-RNTI and/or an RNTI assigned for the concemed UE (e.g., a CRNTI/Z-RNTI) if présent, for example, and as described above. In this situation, the basestation 105-e may transmit the SI by either broadeasting the SI in accordance with on-demand periodic scheduling targeting a cell edge, broadeasting the SI in accordance with on-demand aperiodic scheduling targeting a group of UEs 115, or unicasting the SI in accordance with on-demand aperiodic scheduling targeting a single UE 115.

[0191] In a massive ΜΙΜΟ situation, if the number of UEs 115 requesting SI acquisition is greater than a predetermined threshold number N, then the SI transmission mode module 1435 may détermine to include an indicator in a periodic sync signal 310 that indicates that the SI will be periodically transmitted via a broad-beam operation (e.g., the indicator may indicate that SI transmission is fixed). In this situation, the base station 105-e may periodically transmit via broad-beam the SI without requiring a spécifie SI request from a UE 115, and UEs 115 may acquire the SI by monitoring an SI-RNTI and/or an RNTI assigned for the concemed UE (e.g., a C-RNTI/Z-RNTI) if présent, for example, and as described above.

[0192] If, however, in the massive ΜΙΜΟ situation, the number of UEs 115 requesting SI acquisition is not greater than or equal to the predetermined threshold number N, or is smaller than the predetermined threshold number N2, the SI transmission mode module 1435 may détermine to include an indicator in a periodic sync signal 335,360,385 that indicates that the SI will be transmitted in response to a request (e.g., the indicator may indicate that SI transmission is on-demand). The SI transmission may be either broad-beam or narrow-beam.

In this situation, the base station 105-e may transmit the SI in response to a spécifie SI request from a UE 115, and UEs 115 may acquire the SI by monitoring an SI-RNTI and/or an RNTI assigned for the concemed UE (e.g., a C-RNTI/Z-RNTI) if présent, for example, and as described above. In this situation, the base-station 105-e may transmit the SI by either using a broad-beam transmission of the SI in accordance with on-demand periodic scheduling targeting a cell edge, using a broad-beam transmission of the SI in accordance with ondemand aperiodic scheduling targeting a group of UEs 115, or by using a narrow-beam transmission of the SI in accordance with on-demand aperiodic scheduling targeting a single UE 115.

[0193] In the event that the base station 105-e is operating in a network using an ondemand SI mode, meaning that the base station 105-e is to receive a request from a UE 115 prior to the base station 105-e transmitting SI, the base station SI request module 1440 may be used to facilitate the receipt of such a request. As an example, the base station SI request module 1440 may be used to receive any one of the MSIB transmission request signais 345, 370, 395 of FIG. 3. The MSIB transmission request signais 345, 370, 395 may be sent in accordance with information included with the periodic sync signais 335,360, 385, such as destination and/or timing to be used for the MSIB transmission request signais 345, 370, 395.

[0194] The SI transmit module 1445 may be used to facilitate the transmission of SI to the UEs 115. The SI may be transmitted as a broadcast or broad-beam operation without any need for a request sent by a UE 115. In this example, the SI transmission mode module 1435 may indicate to the SI transmit module 1445 that SI is to be transmitted via a broadcast or a broad-beam operation. The SI transmit module 1445 may then facilitate transmission ofthe SI in accordance with information included with the periodic sync signal 310, such as on a predetermined channel or timing of the SI broadcast. In another example, the SI may be transmitted as either a broadcast or a unicast (or a broad-beam operation or a narrow-beam operation) in response to a request sent by a UE 115. In these examples, the SI transmission mode module 1435 may indicate to the SI transmit module 1445 that SI is to be transmitted as either a broadcast or a unicast (or a broad-beam operation or a narrow-beam operation) in response to a request. The SI transmit module 1445 may then facilitate transmission of the SI in accordance with information included with the periodic sync signais 335, 360, 385, such as use of a predetermined channel or timing of the SI broadcast or unicast (or broad-beam operation or narrow-beam operation).

[0195] FIG. 15 shows a block diagram 1500 of a base station 105-f for use in wireless communication, in accordance with various examples. The base station 105-f may be an example of one or more aspects of a base station 105 described with reference to FIGs. 1-6

V 55 and 14. The base station 105-f may include a base station (or RRH) receiver module 1410-a, an SI transmission module 1420-a, or a base station (or RRH) transmitter module 1430-a, which may be examples ofthe corresponding modules ofbase station 105-e (of FIG. 14). The base station 105-f may also include a processor (not shown). Each of these components may be in communication with each other. The SI transmission module 1420-a may include an SI transmission mode module 1435-a, a base station SI request module 1440-a, or an SI transmit module 1445-a. The SI transmission mode module 1435-a may further include a sync signal transmit module 1505 or an SI transmission mode détermination module 1510. The base station receiver module 1410-a and the base station transmitter module 1430-a may perform the fùnctions of the base station receiver module 1410 and the base station transmitter module 1430, ofFIG. 14, respectively. In configurations ofthe base station 105-f including one or more RRHs, aspects of one or more of the modules 1410-a, 1420-a, or 1430a may be moved to each of the one or more RRHs.

[0196] The modules of the base station 105-f may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail of the applicable fùnctions in hardware. Altematively, the fùnctions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The fùnctions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0197] The sync signal transmit module 1505 of the SI transmission mode module 1435-a may be used by the base station 105-f to transmit a periodic sync signal to indicate to UEs

115 whether SI acquisition is to be performed via a fixed periodic mode or via an on-demand mode. The sync signal transmit module 1505 may transmit a periodic sync signal 310,335, 360, 385, as illustrated in FIG. 3, for example.

[0198] The base station 105-f may further operate in a spécifie SI transmission mode, which may be determined through the use of the SI transmission mode détermination module

1510. Examples of the different transmission modes may be illustrated and described above with relation to FIG. 3. For example, one transmission mode may include an SI broadcast having fixed periodic scheduling and targeting a cell edge, as illustrated in the

transmission/reception timeline 305 of FIG. 3. In this example, the base station 105-f may transmit a periodic sync signal 310 which may indicate to UEs 115 that SI information is to be periodically broadcast without the need for the UEs 115 to transmit a spécifie request for SI.

[0199] Another transmission mode may include an SI broadcast having an on-demand periodic scheduling and that targets a cell edge, as illustrated in the transmission/reception timeline 330 of FIG. 3. In this example, the base station 105-f may transmit a periodic sync signal 335 which may indicate to UEs 115 that SI information is to be periodically broadcast in response to an MSIB transmission request signal 345.

[0200] Yet another transmission mode may include an SI broadcast having an on-demand aperiodic scheduling and that targets a group of UEs 115, as illustrated in the transmission/reception timeline 355 of FIG. 3. In this example, the base station 105-f may transmit a periodic sync signal 360 which may indicate to UEs 115 that SI information is to be aperiodically broadcast in response to an MSIB transmission request signal 370.

[0201] A fourth transmission mode may include an SI unicast having on-demand aperiodic scheduling and that targets a single UE 115, as illustrated in the transmission/reception timeline 380 of FIG. 3. In this example, the base station 105-f may transmit a periodic sync signal 385 which may indicate to UEs 115 that SI information is to be aperiodically unicast in response to an MSIB transmission request signal 395.

[0202] The transmission modes described above hâve been generally described using the terms broadcast and unicast, which may be most appropriately used when the network in which the base station 105-f is participating is a non-massive ΜΙΜΟ network. On the other hand, if a massive ΜΙΜΟ environment is configured, broad-beam and narrow-beam transmissions may be used in place of broadcast or unicast transmissions. A broad-beam transmission may provide wide coverage which can serve more than one UE 115, though a broad-beam transmission may require additional radio resources with respect to a narrowbeam transmission which serves only a single UE 115.

[0203] In general, a broad-beam or broadcast operation offers better efficiency in situations where there are many UEs 115 attempting to acquire SI, while a narrow-beam or unicast operation offers better efficiency in situations where there are a smaller number of UEs 115 attempting to acquire SI.

• 57 [0204] The SI transmission mode détermination module 1510 may facilitate a transition between transmission modes, for example. One implémentation may include the changing of transmission modes based on a number of UEs 115 requesting SI acquisition, network load, congestion status, or available radio resources.

[0205] For example, in a non-massive ΜΙΜΟ situation, if the number of UEs 115 requesting SI acquisition is greater than a predetermined threshold number N, then the SI transmission mode détermination module 1510 may détermine to include an indicator in a periodic sync signal 310 that indicates that the SI will be periodically broadeast (e.g., the indicator may indicate that SI transmission is fixed). In this situation, the base station 105-f may periodically broadeast the SI without requiring a spécifie SI request from a UE 115, and

UEs 115 may acquire the SI by monitoring an SI-RNTI and/or an RNTI assigned for the concemed UE (e.g., a C-RNTI/Z-RNTI) if présent, for example, and as described above.

[0206] If, however, in the non-massive ΜΙΜΟ situation, the number of UEs 115 requesting SI acquisition is not greater than or equal to the predetermined threshold number N, or is smaller than the predetermined threshold number N₂, the SI transmission mode détermination module 1510 may détermine to include an indicator in a periodic sync signal 335,360, 385 that indicates that the SI will be transmitted in response to a request (e.g., the indicator may indicate that SI transmission is on-demand). In this situation, the base station 105-f may transmit the SI in response to a spécifie SI request from a UE 115, and UEs 115 may acquire the SI by monitoring an SI-RNTI and/or an RNTI assigned for the concemed UE (e.g., a CRNTI/Z-RNTI) if présent, for example, and as described above. In this situation, the basestation 105-f may transmit the SI by either broadeasting the SI in accordance with on-demand periodic scheduling targeting a cell edge, broadeasting the SI in accordance with on-demand aperiodic scheduling targeting a group of UEs 115, or unicasting the SI in accordance with on-demand aperiodic scheduling targeting a single UE 115.

[0207] In a massive ΜΙΜΟ situation, if the number of UEs 115 requesting SI acquisition is greater than a predetermined threshold number N, then the SI transmission mode détermination module 1510 may détermine to include an indicator in a periodic sync signal 310 that indicates that the SI will be periodically transmitted via a broad-beam operation (e.g., the indicator may indicate that SI transmission is fixed). In this situation, the base station 105-f may periodically transmit via broad-beam the SI without requiring a spécifie SI request from a UE 115, and UEs 115 may acquire the SI by monitoring an SI-RNTI and/or an

RNTI assigned for the concemed UE (e.g., a C-RNTI/Z-RNTI) if présent, for exemple, and as described above.

[0208] If, however, in the massive ΜΙΜΟ situation, the number of UEs 115 requesting SI acquisition is not greater than or equal to the predetermined threshold number N, or is smaller than the predetermined threshold number N2, the SI transmission mode détermination module 1510 may détermine to include an indicator in a periodic sync signal 335,360,385 that indicates that the SI will be transmitted in response to a request (e.g., the indicator may indicate that SI transmission is on-demand). The SI transmission may be either broad-beam or narrow-beam. In this situation, the base station 105-f may transmit the SI in response to a spécifie SI request from a UE 115, and UEs 115 may acquire the SI by monitoring an SIRNTI and/or an RNTI assigned for the concemed UE (e.g., a C-RNTI/Z-RNTI) if présent, for example, and as described above. In this situation, the base-station 105-f may transmit the SI by either using a broad-beam transmission of the SI in accordance with on-demand periodic scheduling targeting a cell edge, using a broad-beam transmission of the SI in accordance with on-demand aperiodic scheduling targeting a group of UEs 115, or by using a narrowbeam transmission of the SI in accordance with on-demand aperiodic scheduling targeting a single UE 115.

[0209] In the event that the base station 105-f is operating in a network using an ondemand SI mode, meaning that the base station 105-f is to receive a request from a UE 115 prior to the base station 105-f transmitting SI, the base station SI request module 1440-a may be used to facilitate the receipt of such a request. As an example, the base station SI request module 1440-a may be used to receive any one of the MSIB transmission request signais 345, 370, 395 of FIG. 3. The MSIB transmission request signais 345,370, 395 may be sent in accordance with information included with the periodic sync signais 335, 360, 385, such as destination and/or timing to be used for the MSIB transmission request signais 345,370, 395.

[0210] The SI transmit module 1445-a may be used to facilitate the transmission of SI to the UEs 115. The SI may be transmitted as a broadcast or broad-beam operation without any need for a request sent by a UE 115. In this example, the SI transmission mode module 1435-a may indicate to the SI transmit module 1445-a that SI is to be transmitted via a broadcast or a broad-beam operation. The SI transmit module 1445-a may then facilitate transmission of the SI in accordance with information included with the periodic sync signal 310, such as on a predetermined channel or timing of the SI broadcast. In another example, ♦ 59 the SI may be transmitted as either a broadcast or a unicast (or a broad-beam operation or a narrow-beam operation) in response to a request sent by a UE 115. In these examples, the SI transmission mode module 1435-a may indicate to the SI transmit module 1445-a that SI is to be transmitted as either a broadcast or a unicast (or a broad-beam operation or a narrow-beam 5 operation) in response to a request. The SI transmit module 1445-a may then facilitate transmission of the SI in accordance with information included with the periodic sync signais

335,360,385, such as use of a predetermined channel or timing ofthe SI broadcast or unicast (or broad-beam operation or narrow-beam operation).

[0211] FIG. 16 shows a block diagram 1600 of a base station 105-g for use in wireless communication, in accordance with various aspects of the présent dîsclosure. The base station 105-g may be an example of aspects of one or more ofthe base stations 105 described with reference to FIGs. 1-6 and 14-15. The base station 105-g may include a base station (or RRH) receiver module 1410-b, an SI transmission module 1420-b, or a base station (or RRH) transmitter module 1430-b, which may be examples ofthe corresponding modules of base station 105-e (of FIG. 14). The base station 105-g may also include a processor (not shown).

Each of these components may be in communication with each other. The SI transmission module 1420-b may include a master SI transmission management module 1605, an SI request processing module 1610, or another SI transmission management module 1615. The base station receiver module 1410-b and the base station transmitter module 1430-b may perform the functions of the base station receiver module 1410 and the base station transmitter module 1430, of FIG. 14, respectively. In addition, the base station receiver module 1410-b may be used to receive SI signais such as the MSIB transmission request signal 345, 370,395,415, or 615 of FIGs. 3,4, and 6, or the OSIB transmission request 430 or 630 of FIGs. 4 and 6; and the base station transmitter module 1430-b may be used to transmit SI signais such as the OSIB 440,445,640, or 645 of FIGs. 4 and 6. In configurations of the base station 105-g including one or more RRHs, aspects of one or more of the modules 1410-b, 1420-b, or 1430-b may be moved to each of the one or more RRHs.

[0212] The modules of the base station 105-g may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail ofthe applicable functions in hardware. Altematively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other

Semi-Custom ICs), which may be programmée! in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0213] The master SI transmission management module 1605 may be used to transmit a first set of system information (e.g., master system information, such as the master system information included in the MSIB transmitted at 420 in FIG. 4).

[0214] The SI request processing module 1610 may be used to receive a request (e.g., the OSIB transmission request received at 430 in FIG. 4) for additional system information (e.g., non-master system information, such as the other information described with reference to

FIG. 4).

[0215] The other SI transmission management module 1615 may be used to transmit the additional system information based at least in part on the request (e.g., to transmit the other system information included in the OSIB transmitted at 440 or 445 in FIG. 4).

[0216] In some embodiments, transmitting the first set of system information using the master SI transmission management module 1605 may include transmitting an indication of one or more sets of additional system information that are available. In some embodiments, receiving the request for the additional system information using the SI request processing module 1610 may include receiving one or multiple requests for additional system information corresponding to multiple sets of additional system information to be transmitted. For example, the SI request processing module 1610 may receive a single OSIB transmission request indicating one or a plurality of éléments of additional system information that a UE would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of additional system information that the UE would like to receive).

In other examples, a UE may request some types of additional system information in different OSIB transmission requests, and the SI request processing module 1610 may receive a plurality of OSIB transmission requests.

[0217] In some embodiments, transmitting the additional system information using the other SI transmission management module 1615 may include at least one of: transmitting system information indicating which RATs are available in a région and how a UE is to select an available RAT; transmitting system information indicating which services are available in • 61 a région and how a UE is to obtain an available service; transmitting System information relating to an MBMS or a PWS service; transmitting system information relating to location, positioning, or navigation services; or transmitting system information based at least in part on a determined location of a UE.

[0218] In some embodiments, receiving the request for additional system information using the SI request processing module 1610 may include receiving, in the request, one or more capabilities of a UE transmitting the request. In these embodiments, transmitting the additional System information using the other SI transmission management module 1615 may include transmitting system information based at least in part on the one or more capabilities of the base station 105-g included in the request.

[0219] In some embodiments, receiving the request for additional system information using the SI request processing module 1610 may include receiving, in the request, a location of a UE transmitting the request. In these embodiments, the other SI transmission management module 1615 may identify the additional system information to transmit based at least in part on the location of the UE included in the request. Altematively, the other SI transmission management module 1615 may détermine a location ofthe UE transmitting the request, and identify the additional System information to transmit based at least in part on the location of the UE.

[0220] In some embodiments, receiving the request for additional system information using the SI request processing module 1610 may include receiving, in the request, an identification of a UE transmitting the request. In these embodiments, the other SI transmission management module 1615 may identify the additional system information to transmit based at least in part on the identification of the UE included in the request. In some cases, the additional System information may be îdentified by accessing a database that includes the identification of the UE transmitting the request and one or more capabilities of the UE.

[0221] FIG. 17 shows a block diagram 1700 of a base station 105-h for use in wireless communication, in accordance with various aspects of the présent disclosure. The base station 105-h may be an example of aspects of one or more of the base stations 105 described with reference to FIGs. 1-6 and 14-16. The base station 105-h may include a base station (or RRH) receiver module 1410-c, an SI transmission module 1420-c, or a base station (or RRH) transmitter module 1430-c, which may be examples of the corresponding modules of base station 105-e or 105-g (of FIG. 14 or 16). The base station 105-h may also include a processor (not shown). Each of these components may be in communication with each other. The SI transmission module 1420-c may include a sync signal transmission management module 1705, a master SI transmission management module 1605-a, an SI request processing module 1610-a, or another SI transmission management module 1615-a. The base station receiver module 1410-c and the base station transmitter module 1430-c may perform the fonctions of the base station receiver module 1410 and the base station transmitter module 1430, of FIGs. 14 or 16, respectively. In configurations ofthe base station 105-h including one or more RRHs, aspects of one or more ofthe modules 1410-c, 1420-c, or 1430-c may be moved to each of the one or more RRHs.

[0222] The modules of the base station 105-h may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail of the applicable fonctions in hardware. Altematively, the fonctions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The fonctions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0223] The sync signal transmission management module 1705 may be used to broadcast information on a downlink channel. The information may indicate that master system information (e.g., an MSIB) is transmitted in response to a master system information request (e.g., an MSIB transmission request such as the MSIB transmission request received at 415 in FIG. 4) received from a UE. In some examples, the downlink channel may include a synchronization signal (e.g., the instance of the periodic sync signal transmitted at 405 in FIG. 4). The information may be included in (or associated with) the synchronization signal.

[0224] The SI request processing module 1610-a may be used to receive a master system information request (e.g., in accordance with the information broadcast on the downlink channel). In some cases, receiving the master system information request may include receiving, in the request, an identification of one or more capabilities of a UE transmitting the request.

[0225] The master SI transmission management module 1605-a may be used to transmit, in response to receiving the master system information request, the master system information (e.g., the master system information included in the MSIB received at 420 in FIG. 4. In some cases, the master system information may include system information that allows a UE to perform an initial access of a network using one or more of an identification of the network, an identification of the base station, cell sélection configuration and access restrictions, or a network access configuration.

[0226] The SI request processing module 1610-a may also be used to receive a request for additional system information (e.g., the OSIB transmission request received at 430 in FIG. 4).

[0227] In some examples, the other SI transmission management module 1615-a may be used to transmit the additional System information (e.g., non-master System information, such as the other system information described with reference to FIG.4) based at least in part on the request. In some cases, the additional system information may be identified based at least in part on one or more capabilities of the UE identified in the master system information request. The additional system information may also be identified based at least in part on information received in the request.

[0228] In some embodiments, transmitting the first set of System information using the master SI transmission management module 1605-a may include transmitting an indication of one or more sets of additional system information that are available. In some embodiments, receiving the request for the additional system information by the SI request processing module 1610-a may include receiving multiple requests for additional system information corresponding to multiple sets of additional system information to be transmitted. For example, the SI request processing module 1610-a may receive a single OSIB transmission request indicating one or a plurality of éléments of additional system information that a UE would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of additional system information that the UE would like to receive). In other examples, a UE may request some types of additional system information in different OSIB transmission requests, and the SI request processing module 1610-a may receive a plurality of OSIB transmission requests.

[0229] FIG. 18 shows a block diagram 1800 of a base station 105-i for use in wireless communication, in accordance with various aspects of the présent disclosure. The base station 105-i may be an example of aspects of one or more of the base stations 105 described with reference to FIGs. 1-6 and 14-17. The base station 105-i may include a base station (or RRH) receiver module 1410-d, an SI transmission module 1420-d, or a base station (or RRH) transmitter module 1430-d, which may be examples of the corresponding modules of base station 105-e (of FIG. 14). The base station 105-i may also include a processor (not shown). Each of these components may be in communication with each other. The SI transmission module 1420-d may include an SI transmission management module 1805 or an SI request processing module 1810. The base station receiver module 1410-d and the base station transmitter module 1430-d may perform the functions of the base station receiver module 1410 and the base station transmitter module 1430, of FIG. 14, respectively. In addition, the base station receiver module 1410-d may be used to receive SI signais such as the MSIB transmission request signal 345, 370, 395,415, or 615 ofFIGs. 3,4, and 6, or the OSIB transmission request 430 or 630 ofFIGs. 4 and 6; and the base station transmitter module 1430-d may be used to transmit SI signais such as the OSIB 440,445, 640, or 645 ofFIGs. 4 and 6, a value tag associated with SI, or a zone identifier. In configurations ofthe base station 105-i including one or more RRHs, aspects of one or more of the modules 1410-d, 1420-d, or 1430-d may be moved to each of the one or more RRHs.

[0230] The modules of the base station 105-i may, individually or collectlvely, be implemented using one or more ASICs adapted to perform some or ail of the applicable functions in hardware. Altematively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0231] The SI transmission management module 1805 may be used to transmit a first signal (e.g., a sync signal or paging message such as the Instance of the periodic sync signal or paging message transmitted at 605 in FIG. 6 or the MSIB transmitted at 620 in FIG. 6) from a base station to a UE. At the time of transmission ofthe first signal, the UE may communîcate with a network using first system information. The first signal may include information to allow the UE to détermine to request updated system information.

[0232] The SI request processing module 1810 may be used to receive a request from the UE for updated system information (e.g., the MSIB transmission request received at 615 in FIG. 6 or the OSIB transmission request received at 630 in FIG. 6).

[0233] The SI transmission management module 1805 may also be used to transmit the updated system information (e.g., the MSIB transmitted at 620 in FIG. 6 or the OSIB transmitted at 640 or 645 in FIG. 6) based at least in part on the request.

[0234] In some embodiments, transmitting the first signal using the SI transmission management module 1805 may include transmitting a zone identifier (e.g., an area code, a BSIC, or another cell identifier). In some cases, the zone identifier may be transmitted as part of a synchronization signal. In some cases, the zone identifier may identify one of the neighbor RATs of zones 510, 515, or 520 described with reference to FIG. 5.

[0235] FIG. 19 shows a block diagram 1900 of a base station 105-j for use in wireless communication, in accordance with various aspects of the présent disclosure. The base station 105-j may be an example of aspects of one or more of the base stations 105 described with reference to FIGs. 1-6 and 14-18. The base station 105-j may include a base station (or

RRH) receiver module 1410-e, an SI transmission module 1420-e, or a base station (or RRH) transmitter module 1430-e, which may be examples ofthe corresponding modules ofbase station 105-e or 105-i (of FIG. 14 or 18). The base station 105-j may also include a processor (not shown). Each of these components may be in communication with each other. The SI transmission module 1420-e may include an SI transmission management module 1805-a or an SI request processing module 1810-a. The base station receiver module 1410-e and the base station transmitter module 1430-e may perform the functions ofthe base station receiver module 1410 and the base station transmitter module 1430, ofFIGs. 14 or 18, respectively.

In configurations ofthe base station 105-j including one or more RRHs, aspects ofone or 25 more of the modules 1410-e, 1420-e, or 1430-e may be moved to each of the one or more

RRHs.

[0236] The modules of the base station 105-j may, individually or collectively, be implemented using one or more ASICs adapted to perform some or ail ofthe applicable functions in hardware. Alternatively, the functions may be performed by one or more other 30 processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, FPGAs, a SoC, or other

Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or applicationspecific processors.

[0237] The SI transmission management module 1805-a may be used to transmit a first signal (e.g., a sync signal or paging message such as the instance of the periodic sync signal or paging message transmitted at 605 in FIG. 6, or the MSIB transmitted at 620 in FIG. 6) from a base station to a UE. At the time of transmission of the first signal, the UE may communicate with a network using first system information. The first signal may include information to allow the UE to détermine to request updated system information. The first signal may also include an indication that at least a portion of the first system information has changed.

[0238] The SI transmission management module 1805-a may include a modification flag or value tag transmission management module 1905. The modification flag or value tag transmission management module 1905 may be used, in some examples, to transmit one or more modification flags, each of which indicates, by a counter value or Boolean variable (e.g., a binary value), that a corresponding portion of the first system information has changed. In some examples, the corresponding portion of the first system information may include a portion of master system information, such as an MSIB or element of an MSIB, In other examples, the corresponding portion of the first system information may include additional non-master system information, such as an OSIB or element of an OSIB. The master system information may include one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. The master system information may also or altematively include, for example, one or more other éléments ofthe master system information described with reference to FIG. 3. The additional non-master system information may include one or more éléments of the other system information described with reference to FIG. 4 or 6. In some embodiments, the modification flag may be transmitted with (or as a part of) the first signal.

[0239] The modification flag or value tag transmission management module 1905 may also be used, in some examples, to transmit one or more value tags corresponding to at least a portion (or different portions) of the first system information that has/have changed. In some ♦ 67 examples, the one or more value tags may correspond to one or more portions of master system information (e.g., one or more MSIBs, or one or more éléments of one or more MSIBs), one or more portions of additional non-master system information(e.g., one or more OSIBs, or one or more éléments of one or more OSIBs), or a combination thereof. The master system information may include one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. The master system information may also or altematively include, for example, one or more other éléments of the master system information described with reference to FIG. 3. The additional non-master system information may include one or more éléments of the other system information described with reference to FIG. 4 or 6. In some embodiments, one or more value tags may be transmitted with (or as a part of) the first signal.

[0240] The SI request processing module 1810-a may be used to receive a request from the UE for updated system information (e.g., to receive the MSIB transmission request at 615 in

FIG. 6, to receive the OSIB transmission request at 630 in FIG. 6).

[0241] The SI transmission management module 1805-a may also be used to transmit the updated system information (e.g., the MSIB transmitted at 620 in FIG. 6 or the OSIB transmitted at 640 or 645 in FIG. 6) based at least in part on the request.

[0242] FIG. 20A shows a block diagram 2000 of a base station 105-k (e.g., a base station 20 forming part or ail of an eNB) for use in wireless communication, in accordance with various aspects of the présent disclosure. In some examples, the base station 105-k may be an example of one or more aspects of the base station 105 described with reference to FIGs. 1-6 and 14-19. The base station 105-k may be configured to implement or facilitate at least some of the base station features and fùnctions described with reference to FIGs. 1-6 and 14-19.

[0243] The base station 105-k may include a base station processor module 2010, a base station memory module 2020, at least one base station transceiver module (represented by base station transceiver module(s) 2050), at least one base station antenna (represented by base station antenna(s) 2055), or a base station SI transmission module 1420-f. The base station 105-k may also include one or more of a base station communications module 2030 or a network communications module 2040. Each of these components may be in communication with each other, directly or indirectly, over one or more buses 2035.

[0244] The base station memory module 2020 may include RAM or ROM. The base station memory module 2020 may store computer-readable, computer-executable code 2025 containing instructions that are configured to, when executed, cause the base station processor module 2010 to perform various functions described herein related to wireless communication, including, for example, transmission of a synchronization signal. Alternatively, the code 2025 may not be directly exécutable by the base station processor module 2010 but be configured to cause the base station 105-k (e.g., when compiled and executed) to perform various of the functions described herein.

[0245] The base station processor module 2010 may include an intelligent hardware device, e.g., a CPU, a microcontroller, an ASIC, etc. The base station processor module 2010 may process information received through the base station transceiver module(s) 2050, the base station communications module 2030, or the network communications module 2040. The base station processor module 2010 may also process information to be sent to the base station transceiver module(s) 2050 for transmission through the base station antenna(s) 2055, to the base station communications module 2030, for transmission to one or more other base stations 105-1 and 105-m, or to the network communications module 2040 for transmission to a core network 13 0-a, which may be an example of one or more aspects of the core network 130 described with reference to FIG. 1. The base station processor module 2010 may handle, alone or in connection with the base station SI transmission module 1420-f, various aspects of communicating over (or managing communications over) a wireless medium.

[0246] The base station transceiver module(s) 2050 may include a modem configured to modulate packets and provide the modulated packets to the base station antenna(s) 2055 for transmission, and to demodulate packets received from the base station antenna(s) 2055. The base station transceiver module(s) 2050 may, in some examples, be implemented as one or more base station transmitter modules and one or more separate base station receiver modules. The base station transceiver module(s) 2050 may support communications on one or more wireless channels. The base station transceiver module(s) 2050 may be configured to communicate bi-directionally, via the base station antenna(s) 2055, with one or more UEs, such as one or more of the UEs 115 described with reference to FIG. 1,2, 4, 6, 7, 8,9,10,11,

12, or 13. The base station 105-k may, for example, include multiple base station antennas

2055 (e.g., an antenna array). The base station 105-k may communicate with the core network 130-a through the network communications module 2040. The base station 105-k may also communicate with other base stations, such as the base stations 105-1 and 105-m, using the base station communications module 2030.

[0247] The base station SI transmission module 1420-f may be configured to perform or control some or ail of the base station features or functions described with reference to FIGs. 1-6 and 14-19 related to transmission of system information. The base station SI transmission module 1420-f, or portions of it, may include a processor, or some or ail of the functions of the base station SI transmission module 1420-f may be performed by the base station processor module 2010 or in connection with the base station processor module 2010. In some examples, the base station SI transmission module 1420-f may be an example of the SI transmission module described with reference to FIGs. 14-19.

[0248] FIG. 20B shows a block diagram 2005 of a base station 105-n (e.g., a base station forming part or ail of an eNB) for use in wireless communication, in accordance with various aspects of the présent disclosure. In some examples, the base station 105-n may be an example of one or more aspects of the base station 105 described with reference to FIGs. 1-6 and 14-19. The base station 105-n may be configured to implement or facilitate at least some of the base station features and functions described with reference to FIGs. 1-6 and 14-19.

[0249] The base station 105-n may include a central node (or base station server) 2015 and one or more RRHs 2045. The central node 2015 may include a central node processor module 2010-a, a central node memory module 2020-a, a central node SI transmission module 1420-g, or a RRH interface module 2095. In some cases, the central node memory module 2020-a may include code 2025-a. The central node 2015 may also include one or more of a central node communications module 2030-a that may communicate with one or more other central nodes or base stations, such as base stations 105-O or 105-p, or a network communications module 2040-a that may communicate with a core network 130-b. Each of these components may be in communication with each other, directly or indirectly, over one or more buses 2035-a. The central node processor module 2010-a, central node memory module 2020-a, central node SI transmission module 1420-g, central node communications module 2030-a, network communications module 2040-a, and one or more buses 2035-a may perform the functions of the base station processor module 2010, base station memory module 2020, base station SI transmission module 1420, base station communications module 2030, network communications module 2040, and buses 2035, of FIG. 20A, respectively.

Φ 70 [0250] Each of the one or more RRHs 2045 may include a central node interface module 2090, at least one RRH transceiver module (represented by RRH transceiver module(s) 2080), and at least one RRH antenna (represented by RRH antenna(s) 2085), Each of these components may be in communication with each other, directly or indirectly, over one or more RRH buses 2075. The RRH transceiver module(s) 2080 and RRH antenna(s) 2085 may perform the functions of the base station transceiver module(s) 2050 and base station antenna(s) 2055, of FIG. 20A, respectively.

[0251] The RRH 2045 may also include one or more of a RRH processor module 2060, a RRH memory module 2065 (possibly storing code 2070), or a RRH SI transmission module 10 1420-h. Each of the RRH processor module 2060, RRH memory module 2065, and RRH SI transmission module 1420-h may communicate with other modules of the RRH 2045 via the one or more buses 2075. In some examples, some of the functions of the central node processor module 2010-a, central node memory module 2020-a, or central node SI transmission module 1420-g may be ofïloaded to (or replicated in) the RRH processor module 2060, RRH memory module 2065, or RRH SI transmission module 1420-h, respectively.

[0252] The RRH interface module 2095 and central node interface module 2090 may provide a communications interface, between the central node 2015 and RRH 2045, and establish a bi-directional communication link 2098 between the central node 2015 and RRH 20 2045. The communication link 2098 may in some cases be an optical communication link, but may also take other forms.

[0253] The deployment of one or more RRHs 2045 in communication with central node 2015 may be used, for example, to increase the coverage area ofthe base station 105-n or position the central node 2015 and RRHs 2045 in more useful locations. For example, the 25 RRH 2045 may be positioned at a location free of RF obstructions or on a smaller cell tower.

[0254] FIG. 21 is a block diagram of a ΜΙΜΟ communication system 2100 including a base station 105-q and a UE 115-k, in accordance with various aspects of the présent disclosure. The ΜΙΜΟ communication system 2100 may illustrate aspects ofthe wireless communication system 100 described with reference to FIG. 1. The base station 105-q may be an example of aspects of the base station 105 described with reference to FIG. 1,2,4,6,

14, 15,16,17, 18, 19, or 20. The base station 105-q may be equipped with antennas 2134

through 2135, and the UE 115-kmay be equipped with antennas 2152 through 2153. In the ΜΙΜΟ communication System 2100, the base station 105-q may be able to send data over multiple communication links at the same time. Each communication link may be called a “layer” and the “rank” of the communication link may indicate the number of layers used for communication. For example, in a 2x2 ΜΙΜΟ communication System where base station 105-q transmits two “layers,” the rank of the communication link between the base station 105-q and the UE 115-k is two. In some examples, the ΜΙΜΟ communication System 2100 may be configured for communication using non-massive ΜΙΜΟ techniques. In other examples, the ΜΙΜΟ communication System 2100 may be configured for communication using massive ΜΙΜΟ techniques.

[0255] At the base station 105-q, a transmit (Tx) processor 2120 may receive data from a data source. The transmit processor 2120 may process the data. The transmit processor 2120 may also generate control symbols or reference symbols. A transmit ΜΙΜΟ processor 2130 may perform spatial processing (e.g., precoding) on data symbols, control symbols, or reference symbols, if applicable, and may provide output symbol streams to the transmit modulators 2132 through 2133. Each modulator 2132 through 2133 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 2132 through 2133 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink (DL) signal. In one example,

DL signais from modulators 2132 through 2133 may be transmitted via the antennas 2134 through 2135, respectively.

[0256] The UE 115-k may be an example of aspects of the UEs 115 described with reference to FIG. 1,2, 4, 6, 7, 8, 9,10,11,12, or 13. At the UE 115-k, the UE antennas 2152 through 2153 may receive the DL signais from the base station 105-q and may provide the received signais to the modulator/demodulators 2154 through 2155, respectively. Each modulator/demodulator 2154 through 2155 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each modulator/demodulator 2154 through 2155 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A ΜΙΜΟ detector 2156 may obtain received symbols from ail the modulator/demodulators 2154 through 2155, perform ΜΙΜΟ détection on the received symbols, if applicable, and provide detected symbols. A receive (Rx) processor 2158 may process (e.g., demodulate, deinterleave, and décodé) the detected

symbols, providing decoded data for the UE 115-k to a data output, and provide decoded control information to a processor 2180, or memory 2182.

[0257] The processor 2180 may in some cases execute stored instructions to instantiate an SI acquisition module 720-g. The SI acquisition module 720-g may be an example of aspects of the SI acquisition module 720 described with reference to FIGs. 7-13.

[0258] On the uplink (UL), at the UE 115-k, a transmit processor 2164 may receive and process data from a data source. The transmit processor 2164 may also generate reference symbols for a reference signal. The symbols from the transmit processor 2164 may be precoded by a transmit ΜΙΜΟ processor 2166 if applicable, further processed by the modulator/demodulators 2154 through 2155 (e.g., for SC-FDMA, etc.), and be transmitted to the base station 105-q in accordance with the communication parameters received from the base station 105-q. At the base station 105-q, the UL signais from the UE 115-k may be received by the antennas 2134 through 2135, processed by the demodulators 2132 through 2133, detected by a ΜΙΜΟ detector 2136 if applicable, and further processed by a receive (Rx) processor 2138. The receive processor 2138 may provide decoded data to a data output and to the processor 2140 or memory 2142.

[0259] The processor 2140 may in some cases execute stored instructions to instantiate an SI transmission module 1420-h. The SI transmission module 1420-h may be an example of aspects of the SI transmission module 1420 described with reference to FIGs. 14-20.

[0260] The components ofthe UE 115-k may, individually or collectively, be implemented with one or more ASICs adapted to perform some or ail of the applicable fonctions in hardware. Each ofthe noted modules may be a means for performing one or more fonctions related to operation of the ΜΙΜΟ communication system 2100. Similarly, the components of the base station 105-q may, individually or collectively, be implemented with one or more

ASICs adapted to perform some or ail of the applicable fonctions in hardware. Each of the noted components may be a means for performing one or more fonctions related to operation of the ΜΙΜΟ communication system 2100.

[0261] FIG. 22 is a flow chart illustratîng an example of a method 2200 for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure. For clarity, the method 2200 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-8,13, or 21. In some examples a UE may

execute one or more sets of codes to control the functional éléments of the UE to perform the functions described below. In some examples, the method 2200 may be performed by a UE during an initial access procedure.

[0262] At block 2205, a UE may receive a first signal, the first signal including an indication of whether SI is to be requested by the UE. The first signal may, in some examples, be a periodic sync signal, and may indicate to the UE that SI is to be acquired through a fixed periodic broadcast or broad-beam transmission or through an on-demand broadcast, unicast, broad-beam transmission or narrow-beam transmission. The operations at block 2205 may be performed using the SI acquisition module 720 described with reference to FIGs. 7, 8,13, or 21, the SI acquisition mode module 735 described with reference to FIGs. 7 or 8, or the sync signal receipt module 805 described with reference to FIG. 8.

[0263] At block 2210, a UE may obtain SI in accordance with the indication. Thus, if the indication indicates that SI is to be broadcast without the UE requesting the SI, then the UE may receive the SI in a periodic broadcast or broad-beam transmission. If the indication indicates that SI is to be transmitted in response to a UE request, then the UE may receive the SI after the UE has submitted a request for the SI. The operations at block 2210 may be performed using the SI acquisition module 720 described with reference to FIGs. 7, 8,13, or 21, or the SI receipt module 745 described with reference to FIGs. 7 or 8.

[0264] Thus, the method 2200 may provide for wireless communication, and in particular, for SI acquisition. It should be noted that the method 2200 is just one implémentation and that the operations of the method 2200 may be rearranged or otherwise modified such that other implémentations are possible.

[0265] FIG. 23 is a flow chart illustrating an example of a method 2300 for wireless communication at a UE, in accordance with various aspects of the présent disclosure. For clarity, the method 2300 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-8, 13, or 21. In some examples a UE may execute one or more sets of codes to control the functional éléments of the UE to perform the functions described below. In some examples, the method 2300 may be performed by a UE during an initial access procedure.

[0266] At block 2305, a UE may receive a first signal, the first signal including an indication of whether SI is to be requested by the UE. The first signal may, in some examples, be a periodic sync signal, and may indicate to the UE that SI is to be acquired through an on-demand broadcast, unicast, broad-beam transmission or narrow-beam transmission. The operations at block 2305 may be performed using the SI acquisition module 720 described with reference to FIGs. 7, 8, 13, or 21, the SI acquisition mode module 735 described with reference to FIGs. 7 or 8, or the sync signal receipt module 805 described with reference to FIG. 8.

[0267] At block 2310, a UE may send a request for SI in accordance with the indication. The request may be sent in accordance to information included within the first signal, such as destination and/or timing information. The operations at block 2310 may be performed using the SI acquisition module 720 described with reference to FIGs. 7, 8,13, or 21, or the UE SI request module 740 described with reference to FIGs. 7 or 8.

[0268] At block 2315, a UE may receive SI in response to the request. The SI may be received as an on-demand periodic broadcast or broad-beam transmission, an on-demand aperiodic broadcast or broad-beam transmission, or an on-demand aperiodic unicast or narrow-beam transmission. The operations at block 2315 may be performed using the SI acquisition module 720 described with reference to FIGs. 7, 8,13, or 21, or the SI receipt module 745 described with reference to FIGs. 7 or 8.

[0269] Thus, the method 2300 may provide for wireless communication, and in particular, for SI acquisition. It should be noted that the method 2300 is just one implémentation and that the operations ofthe method 2300 may be rearranged or otherwise modified such that other implémentations are possible.

[0270] FIG. 24 is a flow chart illustrating an example of a method 2400 for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure. For clarity, the method 2400 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-8,13, or 21. In some examples a UE may execute one or more sets of codes to control the functional éléments ofthe UE to perform the functions described below. In some examples, the method 2400 may be performed by a UE during an initial access procedure.

[0271] At block 2405, a UE may receive a first signal, the first signal including an indication of whether SI is to be requested by the UE. The first signal may, in some examples, be a periodic sync signal, and may indicate to the UE that SI is to be transmitted

without a need for the UE to request the SI. The operations at block 2405 may be performed using the SI acquisition module 720 described with reference to FIGs. 7, 8,13, or 21, the SI acquisition mode module 735 described with reference to FIGs. 7 or 8, or the sync signal receipt module 805 described with reference to FIG. 8.

[0272] At block 2410, a UE may receive SI via a second signal in accordance with the indication, the second signal being transmitted via a broadcast or broad-beam operation. The SI may be received as a fixed periodic broadcast or broad-beam transmission. The operations at block 2410 may be performed using the SI acquisition module 720 described with reference to FIGs. 7, 8,13, or 21, or the SI receipt module 745 described with reference to

FIGs. 7 or 8.

[0273] Thus, the method 2400 may provide for wireless communication, and in particular, for SI acquisition. It should be noted that the method 2400 is just one implémentation and that the operations of the method 2400 may be rearranged or otherwise modified such that other implémentations are possible.

[0274] FIG. 25 is a fiow chart illustrating an example of a method 2500 for wireless communication at a base station, in accordance with various aspects of the présent disclosure. For clarity, the method 2500 is described below with reference to aspects of one or more of the base stations 105 described with reference to FIGs. 14,15, 20, or 21. In some examples a base station may execute one or more sets of codes to control the functional éléments of the base station to perform the fonctions described below. In some examples, the method 2500 may be performed by a base station during an initial access procedure of a UE.

[0275] At block 2505, a base station may transmit a first signal, the first signal including an indication of whether SI is to be requested by a UE. The first signal may, in some examples, be a periodic sync signal, and may indicate to a UE that SI is to be acquired through a fixed periodic broadcast or broad-beam transmission or through an on-demand broadcast, unicast, broad-beam transmission or narrow-beam transmission. The operations at block 2505 may be performed using the SI transmission module 1420 described with reference to FIGs. 14, 15,20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or 15, or the sync signal transmit module 1505 described with reference 30 to FIG. 15.

[0276J At block 2510, a base station may transmit SI in accordance with the indication.

Thus, if the indication indicates that SI is to be broadcast without a UE requesting the SI, then the base station may transmit the SI in a periodic broadcast or broad-beam transmission. If the indication indicates that SI is to be transmitted in response to a UE request, then the base station may transmit the SI after a UE has submitted a request for the SI. The operations at block 2510 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,20, or 21, or the SI transmit module 1445 described with reference to FIGs. 14 or 15.

[0277] Thus, the method 2500 may provide for wireless communication, and in particular, for SI transmission. It should be noted that the method 2500 is just one implémentation and that the operations ofthe method 2500 may be rearranged or otherwise modified such that other implémentations are possible.

[0278] FIG. 26 is a flow chart illustrating an example of a method 2600 for wireless communication at a base station, in accordance with various aspects ofthe présent disclosure.

For clarity, the method 2600 is described below with reference to aspects of one or more of the base stations 105 described with reference to FIGs. 14,15,20, or 21. In some examples a base station may execute one or more sets of codes to control the functional éléments of the base station to perform the functions described below. In some examples, the method 2600 may be performed by a base station during an initial access procedure of a UE.

[0279] At block 2605, a base station may transmit a first signal, the first signal including an indication of whether SI is to be requested by a UE. The first signal may, in some examples, be a periodic sync signal, and may indicate to a UE that SI is to be acquired through an on-demand broadcast, unicast, broad-beam transmission or narrow-beam transmission. The operations at block 2605 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or 15, or the sync signal transmit module 1505 described with reference to FIG. 15.

[0280] At block 2610, a base station may receive a request for SI in accordance with the indication. The request may be received in accordance to information included within the 30 first signal, such as destination and/or timing information. The operations at block 2610 may be performed using the SI transmission module 1420 described with reference to FIGs. 14, • 77

15,20, or 21, or the base station SI request module 1440 described with reference to FIGs. 14 or 15.

[0281] At block 2615, a base station may transmit SI in response to the request. The SI may be transmitted as an on-demand periodic broadcast or broad-beam transmission, an on5 demand aperiodic broadcast or broad-beam transmission, or an on-demand aperiodic unicast or narrow-beam transmission. The operations at block 2615 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,20, or 21, or the SI transmit module 1445 described with reference to FIGs. 14 or 15.

[0282] Thus, the method 2600 may provide for wireless communication, and in particular, for SI transmission. It should be noted that the method 2600 is just one implémentation and that the operations of the method 2600 may be rearranged or otherwise modified such that other implémentations are possible.

[0283] FIG. 27 is a flow chart illustrating an example of a method 2700 for wireless communication at a base station, in accordance with various aspects of the présent disclosure.

For clarity, the method 2700 is described below with reference to aspects of one or more of the base stations 105 described with reference to FIGs. 14,15,20, or 21. In some examples a base station may execute one or more sets of codes to control the functional éléments of the base station to perform the functions described below. In some examples, the method 2700 may be performed by a base station during an initial access procedure of a UE.

[0284] At block 2705, a base station may transmit a first signal, the first signal including an indication of whether SI is to be requested by a UE. The first signal may, in some examples, be a periodic sync signal, and may indicate to a UE that SI is to be transmitted without a need for the UE to request the SI. The operations at block 2705 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or 15, or the sync signal transmit module 1505 described with reference to FIG. 15.

[0285] At block 2710, a base station may transmit SI via a second signal in accordance with the indication, the second signal being transmitted via a broadcast or broad-beam operation. The SI may be transmitted as a fixed periodic broadcast or broad-beam transmission. The operations at block 2710 may be performed using the SI transmission

module 1420 described with reference to FIGs. 14,15,20, or 21, or the SI transmit module 1445 described with reference to FIGs. 14 or 15.

[0286] Thus, the method 2700 may provide for wireless communication, and in particular, for SI transmission. It should be noted that the method 2700 is just one implémentation and that the operations of the method 2700 may be rearranged or otherwise modified such that other implémentations are possible.

[0287] FIG. 28 is a flow chart illustrating an example of a method 2800 for wireless communication at a base station, in accordance with various aspects of the présent disclosure. For clarity, the method 2800 is described below with reference to aspects of one or more of 10 the base stations 105 described with reference to FIGs. 14,15, 16,20, or 21. In some examples a base station may execute one or more sets of codes to control the functional éléments of the base station to perform the functions described below. In some examples, the method 2800 may be performed by a base station during an initial access procedure of a UE.

[0288] At block 2805, a base station may transmit a first signal, the first signal including an indication of whether SI is to be requested by a UE. The first signal may, in some examples, be a periodic sync signal, and may indicate to a UE that SI is to be acquired through a fïxed periodic broadcast or broad-beam transmission or through an on-demand broadcast, unicast, broad-beam transmission or narrow-beam transmission. The operations at block 2805 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,16, 20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or 15.

[0289] At block 2810, a base station may transmit SI in accordance with the indication and a transmission mode. Thus, if the indication and transmission mode indicates that SI is to be broadcast without a UE requesting the SI, then the base station may transmit the SI in a periodic broadcast or broad-beam transmission. If the indication and transmission mode indicates that SI is to be transmitted in response to a UE request, then the base station may transmit the SI after a UE has submitted a request for the SI. Depending on the transmission mode, the base station may transmit the SI as either a fïxed periodic broadcast or broad-beam transmission, an on-demand periodic broadcast or broad-beam transmission, an on-demand aperiodic broadcast or broad-beam transmission, or an on-demand aperiodic unicast or narrow-beam transmission. The operations at block 2810 may be performed using the SI φ 79 transmission module 1420 described with reference to FIGs. 14,15,16,20, or 21, or the SI transmit module 1445 described with reference to FIGs. 14 or 15.

[0290] At blocks 2815,2820,2825, or 2830, the base station may change its transmission mode. Thus, the base station may perform any one or more of blocks 2815,2820,2825, or

2830. Changes in transmission mode may be made in response to, for example, changes in the numbers of UEs requesting SI from the base station, network load, congestion status or available radio resources.

[0291] At block 2815, a base station may change the transmission mode to be a broadcast or broad-beam mode targeting a cell edge and having fixed periodic scheduling. Changing of the transmission mode may be based on one or more of a number of UEs requesting SI acquisition, network load, congestion status, or available radio resources. The operations at block 2815 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,16,20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or 15, or the SI transmission mode détermination module 1510 described with reference to FIG. 15.

[0292] At block 2820, a base station may change the transmission mode to be a broadcast or broad-beam mode targeting a cell edge and having an on-demand periodic scheduling triggered by a request for system information in accordance with the indication. Changing of the transmission mode may be based on one or more of a number of UEs requesting SI acquisition, network load, congestion status, or available radio resources. The operations at block 2820 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,16,20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or 15, or the SI transmission mode détermination module 1510 described with reference to FIG. 15.

[0293] At block 2825, a base station may change the transmission mode to be a broadcast or broad-beam mode having an on-demand aperiodic scheduling triggered by a request for system information in accordance with the indication. Changing ofthe transmission mode may be based on one or more of a number of UEs requesting SI acquisition, network load, congestion status, or available radio resources. The operations at block 2825 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15, 16,20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or

15, or the SI transmission mode détermination module 1510 described with reference to FIG.

15.

[0294] At block 2830, a base station may change the transmission mode to be a unicast or narrow-beam mode having an on-demand aperiodic scheduling triggered by a request for system information in accordance with the indication. Changing of the transmission mode may be based on one or more of a number of UEs requesting SI acquisition, network load, congestion status, or available radio resources. The operations at block 2830 may be performed using the SI transmission module 1420 described with reference to FIGs. 14,15,

16, 20, or 21, the SI transmission mode module 1435 described with reference to FIGs. 14 or

15, or the SI transmission mode détermination module 1510 described with reference to FIG.

15.

[0295] The operations at blocks 2815,2820,2825,2830 may ail be performed by a base station. Altematively, a base station may perform any one or more of the operations described at blocks 2815, 2820,2825,2830.

[0296] Thus, the method 2800 may provide for wireless communication, and in particular, for SI transmission. It should be noted that the method 2800 is just one implémentation and that the operations of the method 2800 may be rearranged or otherwise modified such that other implémentations are possible.

[0297] FIG. 29 is a fiow chart illustrating an example of a method 2900 for wireless communication at a UE, in accordance with various aspects of the présent disclosure. For clarity, the method 2900 is described below with reference to aspects of one or more ofthe UEs 115 described with reference to FIGs. 1-13 and 21. In some examples a UE may execute one or more sets of codes to control the functional éléments of the UE to perform the functions described below. In some examples, the method 2900 may be performed by a UE receiving system information in a unicast, narrow-beam, broadeast, or broad-beam manner.

[0298] At block 2905, a UE may receive a first set of system information (e.g., master system information, such as master system information included in an MSIB). The operation(s) at block 2905 may be performed using the SI acquisition module 720 described with reference to FIG. 9, 10,13, or 21, or the master SI acquisition module 905 described 30 with reference to FIG. 9 or 10.

φ 81 [0299] At block 2910, the UE may détermine, based at least in part on the first set of system information, that additional System information (e.g., non-master system information, such as information included in an OSIB) is available. The operation(s) at block 2910 may be performed using the SI acquisition module 720 described with reference to FIG. 9,10,13, 5 or 21, or the SI processing module 910 described with reference to FIG. 9 or 10.

[0300] At block 2915, the UE may transmit a request (e.g., an OSIB transmission request) for the additional system information. In some examples, the UE may transmit a plurality of requests for the additional system information. In some examples, a single OSIB transmission request may indicate one or a plurality of éléments of additional system information that the UE would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of additional system information that the UE would like to receive). In other examples, the UE may request some types of additional system information in different OSIB transmission requests, a plurality of OSIB transmission requests may be transmitted. The operation(s) at block 2915 may be performed using the SI 15 acquisition module 720 described with reference to FIG. 9,10,13, or 21, or the UE SI request module 915 described with reference to FIG. 9 or 10. .

[0301] At block 2920, the UE may receive the additional system information. The operation(s) at block 2920 may be performed using the SI acquisition module 720 described with reference to FIG. 9,10,13, or 21, or the other SI acquisition module 920 described with 20 reference to FIG. 9 or 10.

[0302] In some embodiments of the method 2900, receiving the first set of system information may include receiving an indication of one or more sets of additional system information that are available. In some embodiments of the method 2900, transmitting the request for the additional system information may include identifying, in the request for the 25 additional system information, one or more sets of additional system information. In some embodiments, the one or more sets of additional system information identified in the request for the additional system information may include one or more sets of additional system information indicated in the first set of system information.

[0303] In some embodiments of the method 2900, receiving the additional system 30 information, at block 2920, may include at least one of: receiving system information indicatîng which RATs are available in a région and how the UE is to select an available

RAT; receiving system information indicating which services are available in a région and how the UE is to obtain an available service; receiving system information relating to an MBMS or a PWS service; receiving System information relating to location, positioning, or navigation services; or receiving system information based at least in part on a determined location of the UE.

[0304] In some embodiments of the method 2900, transmitting the request for the additional system information may include including one or more capabilities ofthe UE in the request. In these embodiments, receiving the additional system information may include receiving system information based at least in part on the one or more capabilities of the UE included in the request.

[0305] In some embodiments of the method 2900, transmitting the request for the additional system information may include including a location of the UE in the request. In these embodiments, receiving the additional system information may include receiving system information based at least in part on the location of the UE included in the request.

[0306] In some embodiments of the method 2900, transmitting the request for the additional system information may include including an identification ofthe UE in the request. In these embodiments, receiving the additional system information may include receiving the additional system information based at least in part on the identification ofthe UE included in the request.

[0307] Thus, the method 2900 may provide for wireless communication. It should be noted that the method 2900 is just one implémentation and that the operations of the method 2900 may be rearranged or otherwise modified such that other implémentations are possible.

[0308] FIG. 30 is a flow chart illustrating an example of a method 3000 for wireless communication at a UE, in accordance with various aspects of the présent disclosure. For clarity, the method 3000 is described below with reference to aspects of one or more ofthe UEs 115 described with reference to FIGs. 1-13 and 21. In some examples a UE may execute one or more sets of codes to control the functional éléments of the UE to perform the functions described below. In some examples, the method 3000 may be performed by a UE receiving system information in a unicast, narrow-beam, broadcast, or broad-beam manner.

[0309] At block 3005, a UE may décodé information received from a downlink channel. The decoded information may indicate that master system information (e.g., an MSIB) is received in response to a master system information request (e.g., an MSIB transmission request). In some examples, the downlink channel may include a synchronization signal.

The decoded information may include information decoded from the synchronization signal. The operation(s) at block 3005 may be performed using the SI acquisition module 720 described with reference to FIG. 9,10,13, or 21, or the sync signal processing module 1005 described with reference to FIG. 10.

[0310] At block 3010, the UE may transmit a master system information request in accordance with the information decoded from the downlink channel. The operation(s) at block 3010 may be performed using the SI acquisition module 720 described with reference to FIG. 9, 10, 13, or 21, or the UE SI request module 915 described with reference to FIG. 9 or 10.

[0311] At block 3015, the UE may receive the master system information. The master system information may include system information that allows the UE to perform an initial access of a network using one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or a network access configuration. The operation(s) at block 3015 may be performed using the SI acquisition module 720 described with reference to FIG. 9,10, 13, or 21, or the master SI acquisition module 905 described with reference to FIG. 9 or 10.

[0312] At block 3020, the UE may détermine, based at least in part on the master system information, that addîtional system information is available. The operation(s) at block 3020 may be performed using the SI acquisition module 720 described with reference to FIG. 9, 10,13, or 21, or the SI processing module 910 described with reference to FIG. 9 or 10.

[0313] At block 3025, the UE may transmit a request (e.g., an OSIB transmission request) for the addîtional system information. In some examples, the UE may transmit a plurality of requests for the addîtional system information. In some examples, a single OSIB transmission request may indicate one or a plurality of éléments of addîtional system information that the UE would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of addîtional system information that the UE would like to receive). In other examples, the UE may request some types of addîtional

system information in different OSIB transmission requests, a pluralîty of OSIB transmission requests may be transmitted. The operation(s) at block 3025 may be performed using the SI acquisition module 720 described with reference to FIG. 9,10,13, or 21, or the UE SI request module 915 described with reference to FIG. 9 or 10.

[0314] At block 3030, the UE may receive the additional system information. The operation(s) at block 3030 may be performed using the SI acquisition module 720 described with reference to FIG. 9, 10,13, or 21, or the other SI acquisition module 920 described with reference to FIG. 9 or 10.

[0315] In some embodiments of the method 3000, receiving the master system information may include receiving an indication of one or more sets of additional system information that are available. In some embodiments of the method 3000, transmitting the request for the additional system information may include identifying, in the request for the additional system information, one or more sets of additional system information. In some embodiments, the one or more sets of additional system information îdentified in the request for the additional system information may include one or more sets of additional system information indicated in the master system information.

[0316] Thus, the method 3000 may provide for wireless communication. It should be noted that the method 3000 is just one implémentation and that the operations of the method 3000 may be rearranged or otherwise modified such that other implémentations are possible.

[0317] FIG. 31 is a flow chart illustratîng an example of a method 3100 for wireless communication at a base station, in accordance with various aspects of the présent disclosure. For clarity, the method 3100 is described below with reference to aspects of one or more of the base stations 105 described with reference to FIGs. 1-6 and 14-21. In some examples a base station may execute one or more sets of codes to control the functional éléments of the base station to perform the fonctions described below. In some examples, the method 3100 may be performed by a base station transmitting system information in a unicast, narrowbeam, broadeast, or broad-beam manner.

[0318] At block 3105, a base station may transmit a first set of system information (e.g., master system information, such as master system information included in an MSIB). The operation(s) at block 3105 may be performed using the SI transmission module 1420

described with reference to FIG. 16,17,20, or 21, or the master SI transmission management module 1605 described with reference to FIG. 16 or 17.

[0319] At block 3110, the base station may receive a request for additional System information (e.g., non-master System information, such as information included in an OSIB).

The operation(s) at block 3110 may be performed using the SI transmission module 1420 described with reference to FIG. 16, 17,20, or 21, or the SI request processing module 1610 described with reference to FIG. 16 or 17.

[0320] At block 3115, the base station may transmit the additional System information based at least in part on the request. The operation(s) at block 3115 may be performed using 10 the SI transmission module 1420 described with reference to FIG. 16,17,20, or 21, or the other SI transmission management module 1615 described with reference to FIG. 16 or 17.

[0321] In some embodiments of the method 3100, transmitting the first set of system information may include transmitting an indication of one or more sets of additional system information that are available. In some embodiments ofthe method 3100, receiving the request for the additional system information may include receiving multiple requests for additional system information corresponding to multiple sets of additional system information to be transmitted. For example, the method 3100 may include receiving a single OSIB transmission request indicating one or a plurality of éléments of additional system information that a UE would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of additional system information that the UE would like to receive). In other examples, the method 3100 may include receiving requests for some types of additional system information in different OSIB transmission requests. [0322] In some embodiments of the method 3100, transmitting the additional system information, at block 3115, may include at least one of: transmitting system information indicating which RATs are available in a région and how a UE is to select an available RAT; transmitting system information indicating which services are available in a région and how a UE is to obtain an available service; transmitting system information relating to an MBMS or a PWS service; transmitting system information relating to location, positioning, or navigation services; or transmitting system information based at least in part on a determined 30 location of a UE.

[0323] In some embodiments of the method 3100, receiving the request for the additional System information may include receiving, in the request, one or more capabilities of a UE transmitting the request. In these embodiments, transmitting the additional system information may include transmitting System information based at least in part on the one or 5 more capabilities of the UE included in the request.

[0324] In some embodiments of the method 3100, receiving the request for the additional system information may include receiving, in the request, a location of a UE transmitting the request. In these embodiments, the method 3100 may include identifying the additional system information to transmit based at least in part on the location ofthe UE included in the 10 request. Altematively, the method 3100 may include determining a location of a UE transmitting the request, and identifying the additional System information to transmit based at least in part on the location of the UE.

[0325] In some embodiments of the method 3100, receiving the request for the additional System information may include receiving, in the request, an identification of a UE transmitting the request. In these embodiments, the method 3100 may include identifying the additional System information to transmit based at least in part on the identification of the UE included in the request. In some cases, the additional System information may be identified by accessing a database that includes the identification of the UE transmitting the request and one or more capabilities of the UE.

[0326] Thus, the method 3100 may provide for wireless communication. It should be noted that the method 3100 is just one implémentation and that the operations of the method 3100 may be rearranged or otherwise modified such that other implémentations are possible.

[0327] FIG. 32 is a flow chart illustratîng an example of a method 3200 for wireless communication at a base station, in accordance with various aspects ofthe présent disclosure.

For clarity, the method 3200 is described below with reference to aspects of one or more of the base stations 105 described with reference to FIGs. 1-6 and 14-21. In some examples a base station may execute one or more sets of codes to control the functional éléments ofthe base station to perform the functions described below. In some examples, the method 3200 may be performed by a base station transmitting system information in a unicast, narrow30 beam, broadcast, or broad-beam manner.

[0328] At block 3205, the base station may broadcast information on a downlink channel. The information may indicate that master system information (e.g., an MSIB) is transmitted in response to a master system information request (e.g., an MSIB transmission request) received from a UE. In some examples, the downlink channel may include a synchronization signal. The information may be included in (or associated with) the synchronization signal. The operation(s) at block 3205 may be performed using the SI transmission module 1420 described with reference to FIG. 16, 17,20, or 21, or the sync signal transmission management module 1705 described with reference to FIG. 17.

[0329] At block 3210, the base station may receive a master system information request (e.g., in accordance with the information broadcast on the downlink channel). In some cases, receiving the master system information request may include receiving, in the request, an identification of one or more capabilities of a UE transmitting the request. The operation(s) at block 3210 may be performed using the SI transmission module 1420 described with reference to FIG. 16,17,20, or 21, or the SI request processing module 1610 described with reference to FIG. 16 or 17.

[0330] At block 3215, the base station may transmit, in response to receiving the master system information request, the master system information. In some cases, the master system information may include system information that allows a UE to perform an initial access of a network using one or more of an identification of the network, an identification of the base station, cell sélection configuration and access restrictions, or a network access configuration. The operation(s) at block 3215 may be performed using the SI transmission module 1420 described with reference to FIG. 16,17,20, or 21, or the master SI transmission management module 1605 described with reference to FIG. 16 or 17.

[0331] At block 3220, the base station may receive a request for additional system information. The operation(s) at block 3220 may be performed using the SI transmission module 1420 described with reference to FIG. 16,17,20, or 21, or the SI request processing module 1610 described with reference to FIG. 16 or 17.

[0332] At block 3225, the base station may transmit the additional system information based at least in part on the request for the additional system information. In some cases, the additional system information may be identified based at least in part on one or more capabilities ofthe UE identified in the master system information request. The additional

system information may also be identified based at least in part on information received in the request for additional system information, or in other ways (e.g., as described with reference to FIG. 30). The operation(s) at block 3225 may be performed using the SI transmission module 1420 described with reference to FIG. 16,17,20, or 21, or the other SI transmission management module 1615 described with reference to FIG. 16 or 17.

[0333] In some embodiments of the method 3200, transmitting the master system information may include transmitting an indication of one or more sets of additional system information that are available. In some embodiments of the method 3200, receiving the request for the additional system information may include receiving multiple requests for additional system information corresponding to multiple sets of additional system information to be transmitted. For example, the method 3200 may include receiving a single OSIB transmission request indicating one or a plurality of éléments of additional system information that a UE would like to receive (e.g., a binary value in the OSIB transmission request may be set to TRUE for each element of additional system information that the UE would like to receive). In other examples, the method 3100 may include receiving requests for some types of additional system information in different OSIB transmission requests.

[0334] Thus, the method 3200 may provide for wireless communication. It should be noted that the method 3200 is just one implémentation and that the operations of the method 3200 may be rearranged or otherwise modified such that other implémentations are possible.

[0335] FIG. 33 is a flow chart illustrating an example of a method 3300 for wireless communication at a UE, in accordance with various aspects ofthe présent disclosure. For clarity, the method 3300 is described below with reference to aspects of one or more ofthe UEs 115 described with reference to FIGs. 1-13 and 21. In some examples a UE may execute one or more sets of codes to control the functional éléments of the UE to perform the 25 functions described below.

[0336] At block 3305, a UE may receive a first signal (e.g., a sync signal, a paging message, or another type of transmission (e.g., an MSIB)). At the time of receiving the first signal, the UE may communicate with a network using first system information. The first signal may include an indication of whether system information is to be requested by the UE.

The operation(s) at block 3305 may be performed using the SI acquisition module 720

described with reference to FIG. 11,12,13, or 21, or the signal processing module 1105 described with reference to FIG. 11 or 12.

[0337] At block 3310, the UE may détermine, based at least in part on the first signal, to request updated system information. The operation(s) at block 3310 may be performed using the SI acquisition module 720 described with reference to FIG. 11, 12,13, or 21, or the signal processing module 1105 described with reference to FIG. 11 or 12.

[0338] At block 3315, the UE may request updated system information based at least in part on the determining. The operation(s) at block 3315 may be performed using the SI acquisition module 720 described with reference to FIG. 11,12, 13, or 21, or the UE SI request module 1110 described with reference to FIG. 11 or 12.

[0339] In some embodiments of the method 3300, receiving the first signal may include receiving an indication that at least a portion of the first system information has changed. In some examples, the indication may include a modification flag. The modification flag may indicate, by a counter value or Boolean variable (e.g., a binary value), that a corresponding 15 portion of system information has changed. In some examples, the indication may include one or more value tags, as described in more detail with reference to FIG. 6 or 35.

[0340] In some embodiments of the method 3300, determining to request updated system information, at block 3310, may include at least one of: identifying that the UE has moved into a zone using second system information that is different from the first system information; identifying that the network has changed at least a portion of the first System information; or identifying that the UE has moved more than a predetermined distance from a location where the UE obtained the first System information a previous time (e.g., from the location where the UE obtained the first System information last time).

[0341] In some embodiments of the method 3300, receiving the first signal, at block 3305, 25 may include receiving a zone identifier (e.g., an area code, a BSIC, or another cell identifier).

In some cases, the zone identifier may be received as part of a synchronization signal. In these embodiments, the method 3300 may include using the zone identifier to identify that the UE has moved from a first zone to a second zone.

[0342] In some embodiments of the method 3300, determining to request updated System 30 information, at block 3310, may include identifying a distance between a current location of

the UE and a location where the UE obtained the first System information a previous time (e.g., the last time), and determining that the identified distance exceeds a predetermined threshold. In some cases, the predetermined threshold may be received from the network. In some cases, a location signal identifying a location ofthe UE may also be received. The location signal may be received, for example, as part of receiving the first signal. The location signal may also be received in other ways, such as via a GNSS (e.g., GPS, Galileo, GLONASS or BeiDou).

[0343] Thus, the method 3300 may provide for wireless communication. It should be noted that the method 3300 isjust one implémentation and that the operations ofthe method 10 3300 may be rearranged or otherwise modified such that other implémentations are possible.

[0344] FIG. 34 is a flow chart illustrating an example of a method 3400 for wireless communication at a UE, in accordance with various aspects of the présent disclosure. For clarity, the method 3400 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-13 and 21. In some examples a UE may execute one or more sets of codes to control the functional éléments of the UE to perform the functions described below.

[0345] At block 3405, a UE may receive a first signal (e.g., a sync signal, a paging message, or another type of transmission (e.g., an MSIB)). At the time of receiving the first signal, the UE may communîcate with a network using first system information. The first signal may include an indication of whether System information is to be requested by the UE. The first signal may include an indication that at least a portion ofthe first system information has changed. The operation(s) at block 3405 may be performed using the SI acquisition module 720 described with reference to FIG. 11,12,13, or 21, or the signal processing module 1105 described with reference to FIG. 11 or 12.

[0346] At block 3410, the UE may receive one or more modification flags, each of which indicates, by a counter value or Boolean variable (e.g., a binary value), that a corresponding portion ofthe first system information has changed. In some examples, the corresponding portion of the first system information may include a portion of master system information, such as an MSIB or element ofan MSIB, In other examples, the corresponding portion ofthe first system information may include additional non-master system information, such as an OSIB or element of an OSIB. The master system information may include one or more of an

identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. The master system information may also or alternatively include, for example, one or more other éléments of the master system information described with reference to FIG. 3. The additional 5 non-master System information may include one or more éléments of the other system information described with reference to FIG. 4 or 6. In some embodiments, the modification flag received at block 3410 may be received with (or as part of) the first signal received at block 3405. The operation(s) at block 3410 may be performed using the SI acquisition module 720 described with reference to FIG. 11, 12,13, or 21, the signal processing module 10 1105 described with reference to FIG. 11 or 12, or the modification flag or value tag processing module 1205 described with reference to FIG. 12.

[0347] At block 3415, the UE may détermine, based at least in part on the first signal or a modification flag (e.g., when a modification flag is set to TRUE), to request updated System information. The operation(s) at block 3415 may be performed using the SI acquisition 15 module 720 described with reference to FIG. 11,12,13, or 21, the signal processing module

1105 described with reference to FIG. 11 or 12, or the modification flag or value tag processing module 1205 described with reference to FIG. 12.

[0348] At block 3420, the UE may request updated system information (e.g., an updated MSIB or OSIB) based at least in part on the determining. The operation(s) at block 3420 20 may be performed using the SI acquisition module 720 described with reference to FIG. 11,

12, 13, or 21, or the UE SI request module 1110 described with reference to FIG. 11 or 12.

[0349] Thus, the method 3400 may provide for wireless communication. It should be noted that the method 3400 isjust one implémentation and that the operations ofthe method 3400 may be rearranged or otherwise modified such that other implémentations are possible.

[0350] FIG. 35 is a flow chart illustrating an example of a method 3500 for wireless communication at a UE, in accordance with various aspects of the présent disclosure. For clarity, the method 3500 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-13 and 21. In some examples a UE may execute one or more sets of codes to control the functional éléments of the UE to perform the 30 functions described below.

[0351] At block 3505, a UE may receive a first signal (e.g., a sync signal, a paging message, or another type of transmission (e.g., an MSIB)). At the time of receiving the first signal, the UE may communicate with a network using first system information. The first signal may include an indication of whether system information is to be requested by the UE. The first signal may include an indication that at least a portion of the first system information has changed. The operation(s) at block 3505 may be performed using the SI acquisition module 720 described with reference to FIG. 11,12, 13, or 21, or the signal processing module 1105 described with reference to FIG. 11 or 12.

[0352] At block 3510, the UE may receive one or more value tags corresponding to at least a portion (or different portions) of the first system information that hâve changed. In some examples, the one or more value tags may correspond to one or more portions of master system information, one or more portions of additional non-master system information, or a combination thereof. The master system information may include one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. The master system information may also or altematively include, for example, one or more other éléments of the master system information described with reference to FIG. 3. The additional non-master system information may include one or more éléments of the other system information described with reference to FIG. 4 or 6. In some embodiments, one or more value tags received at block 3510 may be received with (or as part of) the first signal received at block 3505. The operation(s) at block 3510 may be performed using the SI acquisition module 720 described with reference to FIG. 11,12,13, or 21, the signal processing module 1105 described with reference to FIG. 11 or 12, or the modification fiag or value tag processing module 1205 described with reference to FIG. 12.

[0353] At block 3515, the UE may détermine, based at least in part on the first signal or the one or more value tags, to request updated System information. In some cases, determining to request updated system information may include comparing a received value tag (e.g., a received value tag associated with an element of non-master system information included in an OSIB) with a previously received value tag (e.g., a previously received value tag for the element of non-master system information), and determining to request the updated system information based at least in part on the comparison (e.g., determining to request the updated system information when the value tags do not match). When a received value tag

corresponds to an element of system information that the UE is not monitoring, the UE may not compare the value tag to a previously received value tag, or may not request the element of system information. The operation(s) at block 3515 may be performed using the SI acquisition module 720 described with reference to FIG. 11,12,13, or 21, the signal processîng module 1105 described with reference to FIG. 11 or 12, or the modification flag or value tag processîng module 1205 described with reference to FIG. 12.

[0354] At block 3520, the UE may request updated system information (e.g., a particular OSIB or element of an OSIB) based at least in part on the determining. The operation(s) at block 3520 may be performed using the SI acquisition module 720 described with reference 10 to FIG. 11,12,13, or 21, or the UE SI request module 1110 described with reference to FIG.

or 12.

[0355] Thus, the method 3500 may provide for wireless communication. It should be noted that the method 3500 is just one implémentation and that the operations ofthe method 3500 may be rearranged or otherwise modified such that other implémentations are possible.

[0356] FIG. 36 is a fiow chart illustrating an example of a method 3600 for wireless communication at a base station, in accordance with various aspects of the présent disclosure. For clarity, the method 3600 is described below with reference to aspects of one or more of the base stations 105 described with reference to FIG. 1,2,4, 6,14,15,16,17,18,19,20, or 21. In some examples a base station may execute one or more sets of codes to control the functional éléments of the base station to perform the functions described below.

[0357] At block 3605, the method 3600 may include transmitting a first signal (e.g., a sync signal, a paging message, or another type of transmission (e.g., an MSIB)) from a base station to a UE. At the time of transmission of the first signal, the UE may communicate with a network using first system information. The first signal may include an indication of whether 25 system information is to be requested by the UE. The first signal may include information to allow the UE to détermine to request updated system information. The operation(s) at block 3605 may be performed using the SI transmission module 1420 described with reference to FIG. 18,19,20, or 21, or the SI transmission management module 1805 described with reference to FIG. 18 or 19.

[0358] At block 3610, the method 3600 may include receiving a request from the UE for updated system information. The operation(s) at block 3610 may be performed using the SI

transmission module 1420 described with reference to FIG. 18,19, 20, or 21, or the SI request processing module 1810 described with reference to FIG. 18 or 19.

[0359] At block 3615, the method 3600 may include transmitting the updated System information based at least in part on the request. The operation(s) at block 3615 may be performed using the SI transmission module 1420 described with reference to FIG. 18, 19, 20, or 21, or the SI transmission management module 1805 described with reference to FIG. 18 or 19.

[0360] In some embodiments of the method 3600, transmitting the first signal may include transmitting an indication that at least a portion of the first System information has changed.

In some examples, the indication may include a modification flag. The modification flag may indicate, by a counter value or Boolean variable (e.g., a binary value), that a corresponding portion of system information has changed. In some examples, the indication may include one or more value tags, as described in more detail with reference to FIG. 38.

[0361] In some embodiments of the method 3600, transmitting the first signal, at block

3605, may include transmitting a zone identifier (e.g., an area code, a BSIC, or another cell identifier). In some cases, the zone identifier may be transmitted as part of a synchronization signal.

[0362] Thus, the method 3600 may provide for wireless communication. It should be noted that the method 3600 is just one implémentation and that the operations of the method 20 3600 may be rearranged or otherwise modified such that other implémentations are possible.

[0363] FIG. 37 is a flow chart illustrating an example of a method 3700 for wireless communication at a base station, in accordance with various aspects ofthe présent disclosure. For clarity, the method 3700 is described below with reference to aspects of one or more of the base stations 105 described with reference to FIG. 1, 2,4, 6,14,15,16,17,18,19, 20, or

21. In some examples a base station may execute one or more sets of codes to control the functional éléments ofthe base station to perform the functions described below.

[0364] At block 3705, the method 3700 may include transmitting a first signal (e.g., a sync signal, a paging message, or another type of transmission (e.g., an MSIB)) from a base station to a UE. At the time oftransmission ofthe first signal, the UE may communicate with a network using first System information. The first signal may include an indication of whether ® 95

System information is to be requested by the UE. The first signal may include information to allow the UE to détermine to request updated system information. The first signal may also include an indication that at least a portion of the first system information has changed. The operation(s) at block 3705 may be performed using the SI transmission module 1420 described with reference to FIG. 18, 19,20, or 21, or the SI transmission management module 1805 described with reference to FIG. 18 or 19.

[0365] At block 3710, the method 3700 may include transmitting one or more modification flags, each of which indicates, by a counter value or Boolean variable (e.g., a binary value), that a corresponding portion of the first system information has changed. In some examples, the corresponding portion of the first system information may include a portion of master system information, such as an MSIB or element of an MSIB, In other examples, the corresponding portion of the first system information may include additional non-master system information, such as an OSIB or element of an OSIB. The master system information may include one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration information. The master system information may also or altematively include, for example, one or more other éléments of the master system information described with reference to FIG. 3. The additional non-master system information may include one or more éléments ofthe other system information described with reference to FIG. 4 or 6. In some embodiments, the modification flag transmitted at block 3710 may be transmitted with (or as a part of) the first signal transmitted at block 3705. The operation(s) at block 3710 may be performed using the SI transmission module 1420 described with reference to FIG. 18,19, 20, or 21, the SI transmission management module 1805 described with reference to FIG. 18 or 19, or the modification flag or value tag transmission management module 1905 described 25 with reference to FIG. 19.

[0366] At block 3715, the method 3700 may include receiving a request from the UE for updated system information (e.g., an updated MSIB or OSIB). The operation(s) at block 3715 may be performed using the SI transmission module 1420 described with reference to FIG. 18,19,20, or 21, or the SI request processing module 1810 described with reference to 30 FIG. 18 or 19.

[0367] At block 3720, the method 3700 may include transmitting the updated system information based at least in part on the request. The operation(s) at block 3720 may be

V 96 performed using the SI transmission module 1420 described with reference to FIG. 18,19,

20, or 21, or the SI transmission management module 1805 described with reference to FIG. 18 or 19.

[0368] Thus, the method 3700 may provide for wireless communication. It should be noted that the method 3700 is just one implémentation and that the operations of the method 3700 may be rearranged or otherwise modified such that other implémentations are possible.

[0369] FIG. 38 is a flow chart illustrating an example of a method 3800 for wireless communication at a base station, in accordance with various aspects of the présent dîsclosure. For clarity, the method 3800 is described below with reference to aspects of one or more of 10 the base stations 105 described with reference to FIG. 1,2, 4, 6,14, 15, 16, 17,18,19,20, or

21. In some examples a base station may execute one or more sets of codes to control the functional éléments of the base station to perform the functions described below.

[0370] At block 3805, the method 3800 may include transmitting a first signal (e.g., a sync signal, a paging message, or another type of transmission (e.g., an MSIB)) from a base station 15 to a UE. At the time of transmission of the first signal, the UE may communicate with a network using first system information. The first signal may include an indication of whether system information is to be requested by the UE. The first signal may include information to allow the UE to détermine to request updated system information. The first signal may also include an indication that at least a portion of the first system information has changed. The operation(s) at block 3805 may be performed using the SI transmission module 1420 described with reference to FIG. 18, 19,20, or 21, or the SI transmission management module 1805 described with reference to FIG. 18 or 19.

[0371] At block 3810, the method 3800 may include transmitting one or more value tags corresponding to at least a portion (or different portions) of the first system information that 25 has/have changed. In some examples, the one or more value tags may correspond to one or more portions of master system information, one or more portions of additional non-master system information, or a combination thereof. The master system information may include one or more of an identification of the network, an identification of a base station in the network, cell sélection configuration and access restrictions, or network access configuration 30 information. The master system information may also or altematively include, for example, one or more other éléments of the master system information described with reference to

W 97

FIG. 3. The additional non-master system information may include one or more éléments of the other System information described with reference to FIG. 4 or 6. In some embodiments, one or more value tags transmitted at block 3810 may be transmitted with (or as a part of) the first signal transmitted at block 3805. The operation(s) at block 3810 may be performed using the SI transmission module 1420 described with reference to FIG. 18,19,20, or 21, the SI transmission management module 1805 described with reference to FIG. 18 or 19, or the modification flag or value tag transmission management module 1905 described with reference to FIG. 19.

[0372] At block 3815, the method 3800 may include receiving a request from the UE for 10 updated System information (e.g., a particular OSIB or element of an OSIB). The operation(s) at block 3815 may be performed using the SI transmission module 1420 described with reference to FIG. 18,19,20, or 21, or the SI request processing module 1810 described with reference to FIG. 18 or 19.

[0373] At block 3820, the method 3800 may include transmitting the updated system 15 information based at least in part on the request. The operation(s) at block 3820 may be performed using the SI transmission module 1420 described with reference to FIG. 18, 19, 20, or 21, or the SI transmission management module 1805 described with reference to FIG. 18 or 19.

[0374] Thus, the method 3800 may provide for wireless communication. It should be 20 noted that the method 3800 is just one implémentation and that the operations of the method

3800 may be rearranged or otherwise modified such that other implémentations are possible.

[0375] The detailed description set forth above in connection with the appended drawings describes examples and does not represent the only examples that may be implemented or that are within the scope of the claims. The terms “example” and “exemplary,” when used in 25 this description, mean “serving as an example, instance, or illustration,” and not “preferred” or “advantageous over other examples.” The detailed description includes spécifie details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these spécifie details. In some instances, well-known structures and apparatuses are shown in block diagram form in order to avoid obscuring the 30 concepts of the described examples.

[0376] Information and signais may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signais, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, 5 optical fields or particles, or any combination thereof.

[0377] The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a digital signal processor (DSP), an ASIC, an FPGA, an SoC, or another programmable logic device, discrète gâte or transistor logic, discrète hardware components, or any combination 10 thereof designed to perform the fonctions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional 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, multiple microprocessors, one or more microprocessors in conjunction with 15 a DSP core, or any other such configuration.

[0378] The fonctions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the fonctions may be stored on or transmitted over as one or more instructions or code on a non-transitory computer-readable medium. Other examples and 20 implémentations are within the scope of the disclosure and appended claims. For example, due to the nature of software, fonctions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing fonctions may also be physically located at various positions, including being distributed such that portions of fonctions are implemented at different 25 physical locations. Also, as used herein, including in the claims, “or” as used in a list of items prefaced by “at least one of ’ indicates a disjunctive list such that, for example, a list of “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

[0379] Computer-readable media includes both computer storage media and communication media including any medium that facilitâtes transfer of a computer program from one place to another. A storage medium may be any available medium that can be accessed by a general purpose or spécial purpose computer. By way of example, and not

limitation, computer-readable media can comprise RAM, ROM, electrically erasable programmable ROM (EEPROM), compact disk ROM (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data 5 structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. 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, radio, and microwave, then 10 the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the définition of medium. Disk and dise, as used herein, include CD, laser dise, optical dise, digital versatile dise (DVD), floppy disk and Blu-ray dise where disks usually reproduce data magnetically, while dises reproduce data optically with lasers. Combinations of the above are also included within the scope of 15 computer-readable media.

[0380] The previous description of the disclosure is provided to enable a person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the common principles defined herein may be appiied to other variations without departing from the scope of the disclosure. Throughout this disclosure the term “example” or “exemplary” indicates an example or instance and does not imply or require any preference for the noted example. Thus, the disclosure is not to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

100 Claims

1. A method for wireless communication, comprising:

2. The method of claim 1, wherein determining to request updated

System information comprises one of:

identifying that the UE has moved into a zone using second system information that is different from the first system information;

identifying that the network has changed at least a portion of the first

20 system information;

identifying that the UE has moved more than a predetermined distance from a location where the UE obtained the first system information; or identifying a distance between a current location of the UE and the location where the UE obtained the first system information; and

25 determining that the identified distance exceeds a predetermined threshold.

3. The method of claim 1, wherein receiving the first signal further

30 comprises:

receiving a zone identifier.

4. The method of claim 1, wherein receiving the first signal further

35 comprises:

receiving a value tag associated with master system information that includes one or more of an identification of the network, an identification of a base

101 station in the network, cell sélection configuration and access restrictions, or network access configuration information.

5 information and an indication of a portion of the first system information that has changed;

means for receiving, at the base station, a request from the UE for updated system information; and means for transmitting, from the base station, the updated system

5. An apparatus for wireless communication, comprising:

means for receiving a first signal at a user equipment (UE), the UE communicating with a network using first system information, the first signal including an indication of whether system information is to be requested by the UE and an indication of a portion of the first system information that has changed;

means for determining, at the UE, based at least in part on the first signal, to request updated System information; and means for requesting, at the UE, updated system information based at least in part on the determining.

5 receiving a first signal at a user equipment (UE), the UE communicating with a network using first system information, the first signal including an indication of whether system information is to be requested by the UE and an indication of a portion of the first system information that has changed;

determining, at the UE, based at least in part on the first signal, to îo request updated system information; and requesting, at the UE, updated system information based at least in part on the determining.

15

6. The apparatus of claim 15, wherein the means for determining to request updated System information comprises one of:

means for identifying that the UE has moved into a zone using second system information that is different from the first System information;

means for identifying that the network has changed at least a portion of the first system information;

means for identifying that the UE has moved more than a predetermined distance from a location where the UE obtained the first system information; or means for identifying a distance between a current location of the UE and the location where the UE obtained the first system information; and means for determining that the identified distance exceeds a predetermined threshold.

7. The apparatus of claim 15, wherein the means for receiving the first signal further comprises:

means for receiving a zone identifier.

8. A method for wireless communication, comprising:

J

102 transmitting a first signal from a base station to a user equipment (UE), the UE communicating with a network using fïrst system information, the first signal including an indication of whether system information is to be requested by the UE and information to allow the UE to détermine to request updated System information and 5 an indication of a portion of the first system information that has changed;

receiving, at the base station, a request from the UE for updated system information; and transmitting, from the base station, the updated system information based at least in part on the request.

îo

9. The method of claim 8, wherein transmitting the first signal comprises one of:

transmitting a zone identifier;

15 transmitting an indication that at least a portion of the first system information has changed; or transmitting one or more value tags corresponding to different portions of the first system information that hâve changed.

10 information based at least in part on the request.

10. The method of claim 9, wherein transmitting the zone identifier comprises one of:

transmitting an area code, a base station identify code (BSIC), or other cell identifier; or

25 transmitting the zone identifier as part of a synchronization signal.

11. The method of claim 8, wherein transmitting the first signal further comprises:

30 transmitting a value tag associated with master system information that includes one or more of an identification of the network, an identification of the base station, cell sélection configuration and access restrictions, or network access configuration.

12. An apparatus for wireless communication, comprising:

J

103 means for transmitting a first signal from a base station to a user equipment (UE), the UE communicating with a network using first system information, the first signal including an indication of whether system information is to be requested by the UE and information to allow the UE to détermine to request updated system

13. The apparatus of claim 12, wherein the means for transmitting the first signal comprises one of:

15 means for transmitting a zone identifier; or means for transmitting one or more value tags corresponding to different portions of the first system information that hâve changed.

20

14. The apparatus of claim 13, further comprising:

means for transmitting a value tag associated with master system information that includes one or more of an identification of the network, an identification of the base station, cell sélection configuration and access restrictions, or network access configuration.

15. A computer program comprising instructions for performing a method according to any of the claims 1-4 or 8-11.