DE102015203166B4 - Improved capture of a sync beacon - Google Patents

Abstract

A method of operating a UE device, the method comprising: at a user equipment device (UE) comprising a first radio, the first radio being configurable to operate according to a first radio access technology (RAT) and a second RAT:executing communicating in accordance with the first RAT at the first radio with a base station;receiving a request to perform a path setup to detect a synchronization beacon on the second RAT, the synchronization beacon recurring in successive first time periods;in response to the request, repetitive performing a search for the synchronization beacon in different subsections of the first time period over successive first time periods, the subsections each comprising one or more frames of the second RAT, the search being repeatedly performed until the synchronization beacon is located in a respective subsection of one of the successive time periods .

Description

field of invention

The present invention relates to wireless devices, and more specifically to a system and method for providing improved performance and/or reduced power consumption in wireless devices that support multiple radio access technologies (RATs).

Description of related art

Wireless communication systems are currently in rapid growth in use. Furthermore, wireless communication technology has evolved from voice-only communication to also include the transmission of data such as Internet and multimedia content. Therefore, improvements in wireless communications are desired. In particular, the large amount of functionality present in a user equipment (UE), e.g., a wireless device such as a cellular phone, can place a significant drain on the UE's battery life. Furthermore, where a UE is configured to support multiple Radio Access Technologies (RATs), certain performance degradations may occur on one or more of the RATs, such as due to path adjustment operations of the other RAT. As a result, techniques that provide power savings and/or improved performance in such wireless UE devices are desired.

New and improved cellular access technologies (RATs) are sometimes deployed in addition to existing RATs. For example, networks implementing Long Time Evolution (LTE) technology developed and standardized by the Third Generation Partnership Project (3GPP) are currently deployed. LTE and other newer RATs often support faster data rates than networks using legacy RATs, such as various Second Generation (2G) and Third Generation (3G) RATs.

However, in some applications, LTE and other new RATs cannot fully support some services that can be handled by legacy networks. Accordingly, LTE networks are often co-deployed in overlapping areas with legacy networks, and UE devices may transition between RATs as services or coverage may require. For example, in some applications, LTE networks are not able to support voice calls. Thus, for example, if a UE device receives or initiates a circuit-switched voice call while connected to an LTE network that does not support voice calls, the UE device may transition to a legacy network, such as one supporting GSM (Global System for Mobile Communications) RAT or a "1X" (Code Division Multiple Access 2000 (CDMA 2000) 1X) RAT that supports voice calls, among other possibilities.

Some UE devices use a single radio to support operation on multiple cellular RATs. For example, some UE devices use a single radio to support operation on both LTE and GSM networks. Using a single radio for multiple RATs adds complexity to roaming between networks, such as in response to a page message for an incoming voice call or circuit switched service. Additionally, using a single radio for multiple RATs presents certain power consumption and performance issues.

For example, in such systems the UE may periodically tune from the first network using a more advanced RAT to the second network using a legacy RAT, for example to listen to a paging channel for a voice call. However, such route setting operations from a more advanced RAT such as LTE to a legacy RAT such as GSM may lead to increased power consumption or performance degradation of the LTE network.

Therefore, it would be desirable to provide improved performance and power consumption in wireless communication systems where UE devices use a single radio to support operation on multiple cellular RATs.

The invention solves this problem by repeatedly searching in different subsections of the first time periods over successive first time periods, the subsections each having one or more frames.

U.S. 2009/0022062 A1 discloses a method and apparatus for performing Inter-Radio Access Technology (RAT) measurements that includes receiving a Long Term Evolution (LTE) metric. A measurement gap is received. Measurements are made for available GSM (Global System for Mobile Communication) cells and the measurement results are reported.

WO 2004/039017 A1 discloses a timing scheme is defined for searching for the GSM frequency correction channel from the CDMA system, comprising the steps of: setting a search window in each CDMA traffic frame; search for the FCCH of a neighboring GSM cell through the search window; if the search is successful, the search is terminated; otherwise the search is restarted.

DE 60107956 T2 discloses a method for observing signals between communication systems operating according to different time frames, wherein a receiving unit (R, R') of a monitoring communication system operating according to a first time frame uses empty windows in its frames to search for information which are sent out by at least one transmission unit (U1, U2...Un) of a monitored communication system which operates according to a second time grid which differs from the first and is asynchronous to it.

US8594021B2 discloses a method for effective measurement in a second radio access technology (eg TD-SCDMA) while receiving services in a first radio access technology (eg GSM).

US 2014 / 0036710 A1 discloses a method of wireless communication that includes monitoring a first RAT for a first paging message with a first receive chain, the method including monitoring a second RAT for a second paging message with a second receive chain, performing an inter-frequency/inter-RAT measurement for the first SIM for the first RAT, and performing an inter-frequency/inter-RAT measurement for the second SIM for the second RAT.

U.S. 2011/0 319 073 A1 discloses a method and a multi-mode mobile communication device that performs this method, the method comprising selecting, by a multi-mode mobile communication device, a first data connection while no data is to be transmitted, the first data connection over a first network using a first radio access technology (RAT) based on a first criterion, and the multi-mode mobile communication device selecting a second data connection while data is being transmitted, the second data connection occurring over a second network using a second RAT based on a second criteria .

Summary of the Invention

Embodiments described herein relate to a user equipment (UE) device and associated method for performing synchronization beacon detection. The UE may include a first radio supporting, for example, a first radio access technology (RAT) and a second RAT simultaneously. The UE can perform a transmission according to the first RAT on the first radio with a base station. The UE may receive a request to perform a path setup to detect a synchronization beacon on the second RAT. The synchronization beacon may occur repeatedly in successive first time periods. The UE may repeatedly search for the synchronization beacon in different subsections over successive first time periods. The search can be performed repeatedly until the synchronization beacon is located in a corresponding subsection of one of the successive time periods.

Embodiments described herein relate to a user equipment (UE) device and associated method for using a frequency error estimate of a first RAT for a second RAT. A first radio of the UE is operable according to a first radio access technology (RAT) and a second RAT. The first radio may have a lower frequency of sleep and wake-up cycles when operating under the first RAT than when operating under the second RAT. The first radio can use a first clock for each of the first RAT and the second RAT, and the first clock can be operated based on an oscillator in the UE. When the radio operates according to the first RAT, after a plurality of cycles of sleep and wake-up, the UE may perform a frequency error estimation (FEE) of the first clock signal and adjust the first clock based on the frequency error estimation. The radio operating according to the first RAT, performing the FEE and adjusting the first clock, is operable to reduce a frequency of the radio performing FEE and adjusting the first clock when operating according to the second RAT.

This summary is provided for the purpose of summarizing some example embodiments to provide a basic understanding of aspects of the subject matter described herein. Accordingly, the features described above are merely examples and should not be construed to limit the scope or spirit of the subject matter described herein in any way. Other Features, aspects, and advantages of the subject matter described herein will become apparent from the following detailed description, figures, and claims.

character list

• 1 zeigt eine beispielhafte Benutzerausrüstung (UE) gemäß einer Ausführungsform;
• 2 zeigt ein beispielhaftes Drahtloskommunikationssystem, wo eine UE mit zwei Basisstationen unter Verwendung zweier unterschiedlicher RATs kommuniziert;
• 3 ist ein beispielhaftes Blockdiagramm einer Basisstation gemäß einer Ausführungsform;
• 4 ist ein beispielhaftes Blockdiagramm einer UE gemäß einer Ausführungsform;
• 5A und 5B sind beispielhafte Blockdiagramme einer drahtloser Kommunikationsschaltung in der UE gemäß einer Ausführungsform;
• 6 ist ein Flussdiagramm, welches ein beispielhaftes Verfahren zum Ausführen einer unterbrochenen Synchronisierungsdetektion zeigt;
• 7 ist ein beispielhaftes Zeitdiagramm, das einer Ausführungsform der 6 entspricht; und
• 8 ist ein Flussdiagramm, welches ein beispielhaftes Verfahren zum Verwenden einer Frequenzfehlereinschätzung einer ersten RAT zeigt.

A better understanding of the present invention can be obtained by considering the following detailed description of the embodiments in conjunction with the following drawings.

• 1 Figure 12 shows an example user equipment (UE) according to one embodiment;
• 2 Figure 12 shows an exemplary wireless communication system where a UE communicates with two base stations using two different RATs;
• 3 12 is an exemplary block diagram of a base station according to one embodiment;
• 4 12 is an exemplary block diagram of a UE according to an embodiment;
• 5A and 5B 12 are example block diagrams of wireless communication circuitry in the UE, according to one embodiment;
• 6 Fig. 12 is a flow chart showing an example method for performing a broken sync detection;
• 7 FIG. 12 is an example timing diagram corresponding to an embodiment of FIG 6 corresponds; and
• 8th FIG. 12 is a flowchart showing an example method for using a frequency error estimate of a first RAT.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and are herein described in detail. However, it is to be understood that the drawings and detailed description thereof are not intended to limit the invention to the precise form disclosed, but on the contrary are intended to cover all modifications, equivalents, and alternatives as may fall within the spirit and scope of the present invention, as appropriate defined by the appended claims.

Detailed description of the embodiments

acronyms

• 3GPP: Third Generation Partnership Project
• 3GPP2: Third Generation Partnership Project 2
• GSM: Global System for Mobile Communications
• UMTS: Universal Mobile Telecommunications System
• LTE: Long Term Evolution
• RAT: Funkzugangstechnologie (Radio Access Technology)
• TX: Senden (Transmit)
• RX: Empfangen (Receive)

The following acronyms are used in the present disclosure.

• 3GPP: Third Generation Partnership Project
• 3GPP2: Third Generation Partnership Project 2
• GSM: Global System for Mobile Communications
• UMTS: Universal Mobile Telecommunications System
• LTE: Long Term Evolution
• RAT: Radio Access Technology
• TX: Send (Transmit)
• RX: Receive

expressions

• Speichermedium - Jede von verschiedenen Typen von Speichervorrichtungen oder Speicherungsvorrichtungen. Der Ausdruck „Speichermedium“ soll ein Installationsmedium umfassen, z.B. eine CD-ROM, Floppy-Disks, eine Bandvorrichtung; einen Computersystemspeicher oder Speicher mit wahlfreiem Zugriff wie beispielsweise DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM usw.; einen nicht-flüchtigen Speicher, wie beispielsweise einen Flash, magnetische Medien, z.B. ein Festplattenlaufwerk, oder optischen Speicher; Register oder andere ähnliche Typen von Speicherelementen usw. Das Speichern kann auch andere Typen von Speicher umfassen oder Kombinationen davon. Zusätzlich kann das Speichermedium in einem ersten Computersystem angeordnet sein, in welchem die Programme ausgeführt werden, oder kann in einem zweiten unterschiedlichen Computersystem angeordnet sein, welches mit dem ersten Computersystem über ein Netzwerk wie beispielsweise das Internet verbunden wird. In dem letzteren Beispiel kann das zweite Computersystem Programminstruktionen an den ersten Computer zur Ausführung bereitstellen. Der Ausdruck „Speichermedium“ kann zwei oder mehrere Speichermedien umfassen, welche sich an unterschiedlichen Orten befinden können, zum Beispiel in unterschiedlichen Computersystemen, welche über ein Netzwerk verbunden sind. Das Speichermedium kann Programminstruktionen speichern (z.B. verkörpert als Computerprogramme), welche durch einen oder mehrere Prozessoren ausgeführt werden können.
• Trägermedium - Ein Speichermedium wie oben beschrieben, sowie ein physisches Übertragungsmedium, wie beispielsweise ein Bus, Netzwerk und/oder andere physisches Übertragungsmedium, welches Signale übermittelt, wie beispielsweise elektrische, elektromagnetische oder digitale Signale.
• Programmierbares Hardwareelement - Umfasst verschiedene Hardwarevorrichtungen, welche mehrere programmierbare Funktionsblöcke aufweisen, welche über eine programmierbare Verbindung verbunden sind. Beispiele umfassen FPGAs (Field Programmable Gate Arrays), PLDs (Programmable Logic Devices), FPOAs (Field Programmable Object Arrays) und CPLDs (Complex PLDs). Die programmierbaren Funktionsblöcke können von feinkörnig (kombinatorische Logik- oder Nachschlagetabellen) zu grobkörnig (arithmetische Logikeinheiten oder Prozessorkerne) reichen. Ein programmierbares Hardwareelement kann auch bezeichnet werden als „rekonfigurierbare Logik“.
• Computersystem - jede von verschiedenen Typen von Rechen- oder Verarbeitungssystemen, umfassend ein Personal-Computer-System (PC), Mainframe-Computersystem, Workstation, Netzwerkgerät, Internetgerät, persönlicher digitaler Assistent (PDA), persönliche Kommunikationsvorrichtung, Smartphone, Fernsehsystem, Netz-Rechensystem, oder andere Vorrichtungen oder Kombinationen von Vorrichtungen. Im Allgemeinen kann der Ausdruck „Computersystem“ breit definiert werden als jede Vorrichtung (oder Kombination von Vorrichtungen) umfassend, welche zumindest einen Prozessor aufweist, welcher Instruktionen von einem Speichermedium ausführt.
• Benutzerausrüstung (UE) (oder „UE-Vorrichtung“) - Jede von verschiedenen Typen von Computersystemvorrichtungen, welche mobil oder tragbar sind und welche drahtlose Kommunikation ausführen. Beispiele von UE-Vorrichtungen umfassen Mobiltelefone oder Smartphones (z.B. iPhone™-, Android™-basierte Telefone), tragbare Spielvorrichtungen (z.B. Nintendo DS™, PlayStation Portable™, Gameboy Advance™, iPhone™), Laptops, PDAs, tragbare Internetvorrichtungen, Musikspieler, Datenspeicherungsvorrichtungen, oder andere handgehaltene Vorrichtungen sowie tragbare Vorrichtungen, wie beispielsweise Armbanduhren, Kopfhörer, Anhänger, Ohrstöpsel, usw. Im Allgemeinen kann der Ausdruck „UE“ oder „UE-Vorrichtung“ breit definiert sein als jede elektronische, Rechen- und/oder Telekommunikationsvorrichtung (oder Kombination von Vorrichtungen) umfassend, welche einfach durch einen Benutzer transportiert wird und fähig zur Drahtloskommunikation ist.
• Basisstation - der Ausdruck „Basisstation“ hat die volle Breite seiner gewöhnlichen Bedeutung und zumindest umfasst er eine Drahtloskommunikationsstation, welche an einem festen Ort installiert ist und verwendet wird zum Kommunizieren eines Teils eines Drahtlos-Telefonsystems oder Funksystems.
• Verarbeitungselement - bezieht sich auf verschiedene Elemente oder Kombinationen von Elementen. Verarbeitungselemente umfassen zum Beispiel Schaltungen, wie beispielsweise ein ASIC (Application Specific Integrated Circuit), Teile oder Schaltungen von individuellen Prozessorkernen, gesamte Prozessorkerne, individuelle Prozessoren, programmierbare Hardwarevorrichtungen, wie beispielsweise ein feldprogrammierbares Gate Array (FPGA), und/oder größere Teile von Systemen, welche mehrere Prozessoren umfassen.
• Automatisch - bezieht sich auf eine Aktion oder Operation, welche durch ein Computersystem (z.B. Software, welche durch das Computersystem ausgeführt wird) oder eine Vorrichtung (z.B. Schaltung, programmierbare Hardwareelemente, ASICs, usw.) ausgeführt wird, ohne Benutzereingabe, welche direkt die Aktion oder Operation spezifiziert oder ausführt. Damit steht der Ausdruck „automatisch“ in Kontrast zu einer Operation, welche manuell durch den Benutzer ausgeführt oder spezifiziert wird, wo der Benutzer Eingabe bereitstellt, um direkt die Operation auszuführen. Eine automatische Prozedur kann initiiert werden durch Eingabe, welche durch den Benutzer bereitgestellt wird, aber die nachfolgenden Aktionen, welche „automatisch“ ausgeführt werden, werden nicht durch den Benutzer spezifiziert, das heißt sie werden nicht „manuell“ ausgeführt, wo der Benutzer jede Aktion, welche auszuführen ist, spezifiziert. Zum Beispiel füllt ein Benutzer, welcher ein elektronisches Formular ausfüllt durch Auswählen jedes Feldes und Bereitstellen von Eingabe-spezifizierender Information (z.B. durch Eingeben von Information, Auswählen von Checkboxen, Funkauswahl, usw.) das Formular manuell aus, obwohl das Computersystem das Formular in Antwort auf die Benutzeraktionen aktualisieren muss. Das Formular kann automatisch durch das Computersystem ausgefüllt werden, wo das Computersystem (z.B. Software, welche auf dem Computersystem ausgeführt wird) die Felder des Formulars analysiert und das Formular ausfüllt, ohne irgendeine Benutzereingabe, welche die Antworten für die Felder spezifiziert. Wie oben angedeutet, kann der Benutzer das automatische Ausfüllen des Formulars aufrufen, aber ist nicht bei dem tatsächlichen Ausfüllen des Formulars involviert (z.B. der Benutzer spezifiziert nicht manuell Antworten für die Felder, sondern sie werden vielmehr automatisch vervollständigt). Die vorliegende Beschreibung stellt verschiedene Beispiele von Operationen bereit, welche automatisch ausgeführt werden in Antwort auf Aktionen, welche der Benutzer vorgenommen hat.

The following is a glossary of terms used in the present application:

• Storage Medium - Any of various types of storage devices or storage devices. The term "storage medium" is intended to include an installation medium, eg, a CD-ROM, floppy disks, a tape device; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory such as flash, magnetic media, eg, a hard disk drive, or optical memory; registers or other similar types of memory elements, etc. Storage may also include other types of memory or combinations thereof. In addition, the storage medium may be located in a first computer system in which the programs are executed, or may be located in a second different computer system that is connected to the first computer system via a network such as the Internet. In the latter example, the second computer system can provide program instructions to the first computer for execution. The term "storage medium" can include two or more storage media, which can be located in different locations, for example in different computer systems that are connected via a network. The storage medium can store program instructions (e.g. embodied as a compu terprograms) which can be executed by one or more processors.
• Carrier Medium - A storage medium as described above, and a physical transmission medium, such as a bus, network, and/or other physical transmission medium that conveys signals, such as electrical, electromagnetic, or digital signals.
• Programmable Hardware Element - Comprises various hardware devices that have multiple programmable functional blocks connected by a programmable link. Examples include FPGAs (Field Programmable Gate Arrays), PLDs (Programmable Logic Devices), FPOAs (Field Programmable Object Arrays), and CPLDs (Complex PLDs). The programmable function blocks can range from fine-grained (combinatorial logic or look-up tables) to coarse-grained (arithmetic logic units or processor cores). A programmable hardware element may also be referred to as "reconfigurable logic".
• Computer System - any of various types of computing or processing systems, including a personal computer system (PC), mainframe computer system, workstation, network device, Internet device, personal digital assistant (PDA), personal communication device, smartphone, television system, network computing system , or other devices or combinations of devices. In general, the term "computer system" can be broadly defined as including any device (or combination of devices) that has at least one processor that executes instructions from a storage medium.
• User Equipment (UE) (or "UE Device") - Any of various types of computing system devices that are mobile or portable and that perform wireless communications. Examples of UE devices include cell phones or smartphones (eg, iPhone™, Android™ based phones), portable gaming devices (eg, Nintendo DS™, PlayStation Portable™, Gameboy Advance™, iPhone™), laptops, PDAs, portable internet devices, music players , data storage devices, or other handheld devices, as well as wearable devices such as wristwatches, headphones, tags, earbuds, etc. In general, the term "UE" or "UE device" can be broadly defined as any electronic, computing, and/or telecommunications device (or combination of devices) that is easily carried by a user and capable of wireless communication.
• Base Station - the term "base station" has the full breadth of its ordinary meaning and at least includes a wireless communication station installed at a fixed location and used to communicate with part of a wireless telephone system or radio system.
• Processing Element - refers to various elements or combinations of elements. Processing elements include, for example, circuitry such as an ASIC (Application Specific Integrated Circuit), portions or circuitry of individual processor cores, entire processor cores, individual processors, programmable hardware devices such as a Field Programmable Gate Array (FPGA), and/or larger portions of systems that span multiple processors.
• Automatic - refers to an action or operation performed by a computer system (e.g., software executed by the computer system) or device (e.g., circuitry, programmable hardware elements, ASICs, etc.) without user input directly affecting the action or specifies or performs an operation. Thus, the term "automatic" is in contrast to an operation performed manually by the user or specified where the user provides input to directly perform the operation. An automatic procedure can be initiated by input provided by the user, but the subsequent actions that are performed "automatically" are not specified by the user, i.e. they are not performed "manually" where the user performs each action , which is to be executed. For example, a user who fills out an electronic form by selecting each field and providing entry-specifying information (e.g., entering information, selecting checkboxes, radio selection, etc.) fills out the form manually, even though the computer system returns the form in response to update user actions. The form can be filled out automatically by the computer system, where the computer system (eg, software running on the computer system) analyzes the fields of the form and fills out the form without any user input specifying the answers for the fields. As indicated above, the user can do that invoke automatic form filling, but is not involved in the actual filling of the form (e.g. the user does not manually specify answers for the fields, rather they are auto-completed). The present description provides various examples of operations that are performed automatically in response to actions taken by the user.

Figure 1 - User Equipment

1 10 shows an example user equipment (UE) 106 according to one embodiment. The term UE 106 can be any of various devices as defined above. The UE device 106 may include a housing 12, which may be constructed from any of a variety of materials. The UE 106 may include a display 14, which may be a touch screen incorporating capacitive touch electrodes. The display 14 can be based on any of a variety of display technologies. The housing 12 of the UE 106 may contain or have openings for any of various elements, such as the home button 16, speaker port 18, or other elements (not shown), such as a microphone, data port, and possibly various other types of buttons, for example Example volume buttons, bell button, etc.

The UE 106 can support multiple radio access technologies (RATs). For example, the UE 106 may be configured to communicate using any of various RATs, such as two or more of Global System for Mobile Communications (GSM), Universal Mode Telecommunication System (UMTS), Code Division Multiple Access (CDMA) (e.g., CDMA2000 1XRTT or other CDMA radio access technologies), Long Term Evolution (LTE), Advanced LTE, and/or other RATs. For example, the UE 106 can support at least two radio access technologies, such as LTE and GSM. Various different or different RATs may be supported as desired.

The UE 106 may include one or more antennas. The UE 106 may also have any of various radio configurations, such as various combinations of one or more transmitter (TX) chains and one or more receiver (RX) chains. For example, the UE 106 may have a radio that supports two or more RATs. The radio may have a single TX (transmit) chain and a single RX (receive) chain. Alternatively, the radio may have a single TX chain and two RX chains, for example, operating on the same frequency. In another embodiment, the UE 106 has two or more radios, ie two or more TX/RX chains (two or more TX chains and two or more RX chains).

In the embodiment described herein, the UE 106 has two antennas that communicate using two or more RATs. For example, the UE 106 may have a pair of cellular phone antennas coupled to a single radio or shared radio. The antennas may be coupled to the shared radio (shared wireless communication circuitry) using circuitry and other radio frequency front-end circuitry. For example, the UE 106 may have a first antenna coupled to a transceiver or radio, ie a first antenna associated with a transmitter (TX) chain for transmitting and with a first receiver (RX) chain for receiving is coupled. The UE 106 may also have a second antenna coupled to a second RX chain. The first and second receiver chains can share a common local oscillator, which means that both the first and second receiver chains tune to the same frequency. The first and second receiver chains may be referred to as the first receiver chain (PRX) and the diversity receiver chain (DRX).

In some embodiments, the PRX and DRX receiver chains operate as a pair and time-division multiplex between two or more RATs, such as LTE, and one or more other RATs, such as GSM or CDMA1x. In the primary embodiment described herein, the UE 106 has a transmitter chain and two receiver chains (PRX and DRX), where the transmitter chain and the two receiver chains (acting as a pair) time-multiplex between two (or more) RATs, such as LTE and GSM.

Each antenna can receive a wide range of frequencies, such as from 600 MHz to 3 GHz. This allows, for example, the local oscillator of the PRX and DRX receiver chains to tune to a specific frequency, such as an LTE frequency band, where the PRX receiver chain receives samples from antenna 1 and the DRX receiver chain receives samples from antenna 2, both on the same frequency (since they use the same local oscillator). The wireless circuitry in the UE 106 can be configured in real time depending on the desired mode of operation for the UE 106 the. In the exemplary embodiment described herein, the UE 106 is configured to support LTE and GSM radio access technologies.

Figure 2 - Communication System

2 Figure 1 shows an example (and simplified) wireless communication system. It is clear that the system of 2 is just one example of a possible system and embodiments can be implemented in any of various systems as desired.

As shown, the example wireless communication system includes base stations 102A and 102B that communicate with one or more user equipment (UE) devices, represented as UE 106, over a transmission medium. The base stations 102 may be base transceiver stations (BTS) or cell sites and may include hardware that enables wireless communication with the UE 106 . Each base station 102 may also be equipped to communicate with a core network 100. For example, base station 102A may be coupled to core network 100A, while base station 102B may be coupled to core network 100B. Each core network can be operated by a respective mobile service operator, or the plurality of core networks 100A can be operated by the same mobile service operator. Each core network 100 may also be coupled to one or more external networks (such as external network 108), which may include the Internet, a public switched telephone network (PSTN), and/or any other network. Thus, base stations 102 may enable communication between UE devices 106 and/or between UE devices 106 and networks 100A, 100B, and 108.

The base stations 102 and the UEs 106 may be configured to communicate over the transmission medium using any of various radio access technologies ("RATs", also referred to as wireless communication technologies or telecommunications standards), such as GSM, UMTS (WCDMA), LTE, LTE Advanced ( LTE-A), 3GPP2 CDMA2000 (e.g. 1xRTT, 1xEV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN or Wi-Fi), IEEE 802.16 (WiMAX), etc.

Base station 102A and core network 100A may operate under a first RAT (e.g., LTE), while base station 102B and core network 100B may operate under a second (e.g., different) RAT (e.g., GSM, CDMA2000, or other legacy or circuit-switched technologies ). The two networks can be controlled by the same network operator (e.g., wireless service provider or "provider"), or by different network operators, as desired. Additionally, the two networks can operate independently of each other (e.g., when operated according to different RATs), or can operate in a coupled or nearly coupled manner.

It should also be noted that while two different networks can be used to support two different RATs, for example as shown in the example network configuration shown in 2 as shown, other network configurations implementing multiple RATs are also possible. As an example, base stations 102A and 102B could operate under different RATs but be coupled to the same core network. As another example, the multi-mode base stations capable of simultaneously supporting different RATs (eg, LTE and GSM, LTE and CDMA2000 1xRTT, and/or any other combination of RATs) could be coupled to a core network that also supports the different Cellular communication technologies supported. In one embodiment, the UE 106 may be configured to use a first RAT that is a packet-switched technology (e.g., LTE) and a second RAT that is a circuit-switched technology (e.g., GSM or 1xRTT).

As discussed above, the UE 106 may be capable of communicating using multiple RATs, such as those within 3GPP, 3GPP2, or any desired cellular standard. The UE 106 may also be configured to communicate using WLAN, Bluetooth, one or more Global Navigational Satellite Systems (GNSS, e.g. GPS or GLONASS), one or more mobile television broadcasting standards (e.g. ATSC-M/H or DVB-H) , etc. Other combinations of network communication standards are also possible.

The base stations 102A and 102B and other base stations operating according to the same or different RATs or cellular communication standards can thus be deployed as a network of cells providing continuous or near-continuous overlapping service to the UE 106 and similar devices over a wide geographic area over one or more radio access technologies (RATs).

Figure 3 - base station

3 10 shows an exemplary block diagram of a base station 102. It is understood that the base station of FIG 3 is just an example of a possible base station. As shown, base station 102 may include processor(s) 504 that may execute program instructions for base station 102 . The processor(s) 504 may also be coupled to a memory management unit (MMU) 540, which may be configured to receive addresses from the processor(s) 504 and translate those addresses to locations in memory (e.g., memory 560 and read only memory (ROM) 550) or other circuits or devices.

The base station 102 may include at least one network port 570 . Network connector 570 may be configured to couple to a telephone network and provide access to the telephone network to a variety of devices, such as UE devices 106, as described above.

Network port 570 (or an additional network port) may also or alternatively be configured to couple to a cellular network, such as a core network of a cellular service provider. The core network may provide mobility-related services and/or other services to a variety of devices, such as UE devices 106 . In some cases, the outlet 570 may couple to a telephone network via the core network and/or the core network may provide a telephone network (e.g., between other UE devices 106 served by the cellular service provider).

The base station 102 can include at least one antenna 534 . The at least one antenna 534 may be configured to operate as a wireless transceiver and further configured to communicate with the UE devices 106 via the radio 530. The antenna 534 communicates with the radio 530 via the communication chain 532. The Communication chain 532 may be a receive chain, a transmit chain, or both. Radio 530 may be configured to communicate over various RATs including but not limited to LTE, GSM, WCDMA, CDMA2000, etc.

The processor(s) 504 of the base station 102 may be configured to implement some or all of the methods described herein, for example by executing program instructions stored on a storage medium (e.g., a non-transitory computer-readable storage medium). Alternatively, the processor 504 may be implemented as a programmable hardware element, such as an FPGA (Field Programmable Gate Array), or as an ASIC (Application Specific Integrated Circuit), or a combination thereof.

Figure 4 - User Equipment (UE)

4 10 shows an exemplary simplified block diagram of a UE 106. As shown, the UE 106 may include a system on chip (SOC) 400, which may include portions for various purposes. The SOC 400 may be coupled to various other circuits of the UE 106. For example, the UE 106 may include various types of memory (e.g., NAND flash 410), a connector interface 420 (e.g., for coupling to a computer system, dock, cradle, etc.), the display 460, the cellular communication circuitry 430, such as for LTE , GSM, etc., and short-range wireless communication circuitry 429 (eg, Bluetooth and WLAN circuitry). The UE 106 may further include one or more smart cards 310 having SIM (Subscriber Identity Module) functionality, such as one or more UICC(s) (Universal Integrated Circuit Card(s)) cards 310. The cellular communications circuitry 430 may coupled to one or more antennas, preferably two antennas 435 and 436 as shown. Short-range wireless communication circuitry 429 may also be coupled to either or both of antennas 435 or 436 (this connectivity is not shown for purposes of illustration).

As shown, the SOC 400 may include a processor(s) 402 capable of executing program instructions for the UE 106 and a display circuitry 404 capable of performing graphics processing and providing display signals to the display 460 . Processor(s) 402 may also be coupled to memory management unit (MMU) 440, which may be configured to receive addresses from processor(s) 402 and translate those addresses to locations in memory (e.g., memory 406, read only memory (ROM) 415, NAND flash memory 410), and/or to other circuits or devices such as display circuitry 404, cellular communication circuitry 430, short-range wireless communication circuitry 429, connector I/F 420, and/or display 460. The MMU 440 may be configured to perform memory protection and page table translation or adjustment. In some embodiments, MMU 440 may be included as part of processor(s) 402 .

In one embodiment as mentioned above, the UE 106 has at least one smart card 310, such as a UICC 310, that runs one or more Subscriber Identity Module (SIM) applications and/or otherwise implements SIM functionality. The at least one smart card 310 may be just a single smart card 310, or the UE 106 may have two or more smart cards 310. Each smart card 310 can be embedded, for example soldered onto a circuit board in the UE 106, or each smart card 310 can be implemented as a removable smart card. Thus, smart card(s) 310 may be one or more removable smart cards (such as UICC cards, sometimes referred to as "SIM cards") and/or smart card(s) 310 may be one or more embedded Cards (such as embedded UICCs (eUICCs), sometimes referred to as "eSIMs" or "eSIM cards"). In some embodiments (such as when the smart card(s) 310 includes an eUICC), one or more of the smart card(s) 310 may implement embedded SIM (eSIM) functionality; in such an embodiment, a single one of the smart card(s) 310 can run multiple SIM applications. Each of the smart card(s) 310 may include components such as a processor and memory; Instructions for executing SIM/eSIM functionality can be stored in memory and executed by the processor. In one embodiment, UE 106 may have a combination of removable smart cards and fixed/non-removable smart cards (such as one or more eUICC cards that implement eSIM functionality) as desired. For example, the UE 106 may have two embedded smart cards 310, two removable smart cards 310, or a combination of one embedded smart card 310 and one removable smart card 310. Various other SIM configurations are also included.

As mentioned above, in one embodiment, the UE 106 has two or more smart cards 310, each implementing SIM functionality. Including two or more SIM smart cards 310 in the UE 106 may allow the UE 106 to support two different phone numbers and may allow the UE 106 to communicate on corresponding two or more respective networks. For example, a first smart card 310 may have SIM functionality to support a first RAT, such as LTE, and a second smart card 310 may have SIM functionality to support a second RAT, such as GSM. Other implementations and RATs are of course possible. Where the UE 106 has two smart cards 310, the UE 106 may support Dual SIM Dual Active (DSDA) functionality. The DSDA functionality may allow the UE 106 to be connected to two networks at the same time (and to use two different RATs). The DSDA functionality may also allow the UE 106 to receive voice calls or data traffic on each of the phone numbers simultaneously. In another embodiment, the UE 106 supports dual SIM dual standby (DSDS) functionality. The DSDS functionality may allow each of the two smart cards 310 in the UE 106 to stand by, awaiting a voice call and/or a data connection. In DSDS, when a call/data is established on one SIM 310, the other SIM 310 is no longer active. In another embodiment, DSDx functionality (either DSDA or DSDS functionality) can be implemented with a single smart card (e.g. an eUICC) running multiple SIM applications for different carriers and/or RATs.

As mentioned above, the UE 106 may be configured to communicate wirelessly using multiple radio access technologies (RATs). As further noted above, in such cases, the cellular communications circuitry (radio(s)) 430 may include radio components that are shared between multiple RATs and/or include radio components that are dedicated exclusively for use pursuant to a single RAT. Where UE 106 has at least two antennas, antennas 435 and 436 may be configurable to implement MIMO (multiple input multiple output) communications.

As described herein, the UE 106 may include hardware and software components to implement features for communicating using two or more RATs such as those described herein. The processor 402 of the UE device 106 may be configured to implement some or all of the features described herein, for example by executing program instructions stored on a storage medium (e.g., a non-transitory computer-readable storage medium). Alternatively (or additionally), the processor 402 may be implemented as a programmable hardware element, such as an FPGA (Field Programmable Gate Array), or as an ASIC (Application Specific Integrated Circuit). Alternatively (or in addition), the processor 402 of the UE device 106 may be implemented in conjunction with one or more of the other components 400, 404, 406, 410, 420, 430, 435, 440, 450, 460, some or all of the to implement features described herein.

Figures 5A and 5B - UE transmit/receive logic

5A 10 shows a portion of UE 106 according to one embodiment. As shown, the UE 106 may include a control circuitry 42 configured to store and execute control code for implementing control algorithms in the UE 106. The control circuitry 42 may include storage and processing circuitry 28 (e.g., a microprocessor, memory circuitry, etc. ) and may include a baseband processor integrated circuit 58 . Baseband processor 58 may form part of wireless circuitry 34 and may include memory and processing circuitry (ie, baseband processor 58 may be considered to form part of the memory and processing circuitry of UE 106). The baseband processor 58 may include software and/or logic for handling various different RATs, such as GSM logic 72 and LTE logic 74, among others.

Baseband processor 58 may provide data to storage and processing circuitry 28 (e.g., a microprocessor, non-volatile memory, volatile memory, other control circuitry, etc.) via path 48 . The data on path 48 may include raw and processed data associated with UE cellular communications and operations, such as cellular communications data, wireless (antenna) performance metrics for received signals, information associated with path adjustment operations information associated with paging operations, etc. This information may be analyzed by storage and processing circuitry 28 and/or processor 58, and in response storage and processing circuitry 28 (or baseband processor 58, if desired) may Issue control commands to control wireless circuitry 34. For example, storage and processing circuitry 28 may issue control commands on path 52 and path 50 and/or baseband processor 58 may issue commands on path 46 and path 51.

Wireless circuitry 34 may include radio frequency transceiver circuitry, such as radio frequency transceiver circuitry 60 and radio frequency front end circuitry 62. Radio frequency transceiver circuitry 60 may include one or more radio frequency transceivers. In the embodiment shown, the radio frequency transceiver circuitry 60 includes a transceiver (TX) chain 59, receiver (RX) chain 61, and RX chain 63. FIG. As mentioned above, the two RX chains 61 and 63 can be a primary RX chain 61 and a diversity RX chain 63 . The two RX chains 61 and 63 can be connected to the same local oscillator (LO) and thus can be operated together at the same frequency for MIMO operations. Thus, the TX chain 59 and the two RX chains 61 and 63, along with other necessary circuitry, can be viewed as a single radio. Other embodiments are of course contemplated. For example, the radio frequency transceiver circuitry 60 may have only a single TX chain and only a single RX chain, also a single radio embodiment. Thus, the term "radio" can be defined to have the broadest scope of its ordinary and accepted meaning, and includes the circuitry normally found in a radio, including either a single TX chain and a single RX chain, or a single TX chain and two (or more) RX chains, for example connected to the same LO. The term radio can include the transmit and receive chains discussed above, and can also include digital signal processing coupled to the radio frequency circuitry (e.g., the transmit and receive chains) associated with performing wireless communications. As an example, the broadcast chain may include such components as amplifiers, mixers, filters, and digital-to-analog converters. Similarly, the receive chain(s) may include such components as amplifiers, mixers, filters, and analog-to-digital converters, for example. As mentioned above, multiple receive chains can share a LO, although in other embodiments they can have their own LO. The wireless communications circuitry may comprise a larger set of components, for example including one or more UE radios (transmission/reception chains, and/or digital signal processing), baseband processors, etc. The term "cellular wireless communications circuitry" encompasses various circuitry for Performing cellular communications, for example, in contrast to other protocols that are non-cellular in nature, such as Bluetooth. Certain embodiments of the invention described herein are operable to improve performance when a single radio (e.g., a radio with a single TX chain and a single RX chain; or a radio with a single TX chain and two RX chains, where the two RX chains are connected to the same LO) supports multiple RATs.

As shown in 5B , the radio frequency transceiver circuitry 60 may also include two or more TX chains and two or more RX chains. For example shows 5B an embodiment with a first radio device 57, wel ches has a TX chain 59 and an RX chain 61, and a second radio 63, which has a first TX chain 65 and a second TX chain 67. Embodiments are also contemplated where additional TX/RX receive chains are included in the embodiment of FIG 5A may be included, i.e. in addition to the one TX chain 59 and the two RX chains 61 and 63 shown. In those embodiments having multiple TX and RX chains, when only one radio is currently active, e.g., the second radio is powered off to conserve power, certain embodiments of the invention described herein may be operated to Improve the performance of the single active radio when it supports multiple RATs.

Baseband processor 58 may receive digital data to be transmitted from storage and processing circuitry 28 and may use path 46 and radio frequency transceiver circuitry 60 to transmit corresponding radio frequency signals. The radio frequency front end 62 may be coupled between the radio frequency transceiver 60 and the antennas 40 and may be used to transmit the radio frequency signals generated by the radio frequency transceiver circuitry 60 to the antennas 40. The radio frequency front end 62 may RF switches, impedance matching circuits, filters, and other circuitry for interfacing antennas 40 and RF transceiver 60.

Incoming radio frequency signals received by antennas 40 may be transmitted to baseband processor 58 via radio frequency front end 62, paths such as paths 54 and 56, receiver circuitry in radio frequency transceiver 60 and paths such as path 46, to be provided. For example, path 54 may be used in handling the signals associated with transceiver 57, whereas path 56 may be used in handling signals associated with transceiver 63. Baseband processor 58 may convert received signals into digital data, which is provided to storage and processing circuitry 28 . The baseband processor 58 can also extract information from the received signals indicative of the signal quality for the channel to which the transceiver is currently tuned. For example, baseband processor 58 and/or other circuitry within control circuitry 42 may analyze received signals to generate various measurements, such as bit error rate measurements, measurements of the amount of power associated with incoming wireless signals, strength indicators (RSSI) Information, Received Signal Code Power (RSCP) information, Reference Symbol Received Power (RSRP) information, Signal to Interference Ratio (SINR) information, Signal to Noise Ratio (SNR) information , channel quality measurements based on signal quality data such as Ec/Io or Ec/No data, etc.

The radio frequency front end 62 may include circuitry. Circuitry may be configured by control signals received from control circuitry 42 (e.g., control signals from storage and processing circuitry 28 via path 50 and/or control signals from baseband processor 58 via path 51). The circuitry may include a switch (circuitry) used to connect the TX and RX chain(s) to antennas 40a and 40b. Radio frequency transceiver circuitry 60 may be configured by control signals received from storage and processing circuitry over path 52 and/or control signals received from baseband processor 58 over path 46 .

The number of antennas used may depend on the mode of operation for the UE 106. For example, as shown in FIG 5A , in normal LTE operation, antennas 40a and 40b with respective receivers 61 and 63 can be used to implement a receive diversity scheme, such as for MIMO operations. With this type of arrangement, two LTE data streams can be received and processed simultaneously using the baseband processor 58. If it is desired to monitor a GSM paging channel for incoming GSM pages, one or both of the antennas can be used temporarily when receiving GSM paging channel signals.

The control circuitry 42 can be used to execute software to handle more than one radio access technology. For example, the baseband processor 58 may include memory and control circuitry for implementing multiple protocol stacks, such as a GSM protocol stack 72 and an LTE protocol stack 74. Thus, the protocol stack 72 may be associated with a first radio access technology, such as GSM (as an example) , and a protocol stack 74 may be associated with a second radio access technology, such as LTE (as an example). During operation, the UE 106 can use the GSM protocol stack 72 ver use to handle GSM functions, and may use the LTE protocol stack 74 to handle LTE functions. Additional protocol stacks, additional transceivers, additional antennas 40, and other additional hardware and/or software can be used in the UE 106 if desired. The arrangement of 5A and 5B is illustrative only. In one embodiment, one or both of the protocol stacks may be configured to implement the methods described in the flowcharts below.

In one embodiment of 5A (or 5B), the cost and complexity of the UE 106 can be minimized by implementing the wireless circuitry of FIG 5A (or 5B) using an arrangement in which the baseband processor 58 and the radio transceiver circuitry 60 are used to support both LTE and GSM traffic.

GSM radio access technology can generally be used to carry voice traffic, whereas LTE radio access technology can generally be used to carry data traffic. To ensure that the GSM voice calls are not interrupted due to LTE data traffic, GSM operations can take priority over LTE operations. To ensure that the operations, such as monitoring a GSM paging channel for incoming paging signals, do not unnecessarily interfere with LTE operations, whenever possible the control circuitry 42 may set up the wireless circuitry of UE 106 to Wireless resources are shared between the LTE and GSM functions.

When a user has an incoming GSM call, the UE 106 GSM network may send a paging signal (sometimes referred to as a page) on the GSM paging channel using the base station 102 . When the UE 106 detects an incoming page, the UE 106 can perform appropriate actions (e.g., call establishment procedures) to set up and receive the incoming GSM call. Pages are typically sent multiple times at fixed intervals through the network, so devices such as UE 106 will have multiple opportunities to successfully receive a page.

Proper GSM page reception may require the wireless circuitry of the UE 106 to be periodically tuned to the GSM paging channel, referred to as a path setting operation. If the transceiver circuitry 60 is unable to tune to the GSM paging channel, or if the GSM protocol stack 72 in the baseband processor 58 is unable to monitor the paging channel for incoming messages, the Missed GSM pages. On the other hand, excessive monitoring of the GSM paging channel can have an adverse effect on an active LTE data session. Embodiments of the invention may include improved methods for handling path adjustment operations, as described below.

In some embodiments, to save power for the UE 106, the GSM and LTE protocol stacks 72 and 74 may support idle mode operations. Also, either or both of protocol stacks 72 and 74 may support discontinuous reception (DRX) mode and/or connected discontinuous reception (CDRX) mode. DRX mode refers to a mode that turns off at least part of the UE circuitry when there is no data (or voice) to be received. In the DRX and CRDX modes, the UE 106 synchronizes with the base station 102 and wakes up at specific times or intervals to listen to the network. DRX is present in some wireless standards, such as UMTS, LTE (Long-term evolution), WiMAX, etc. The terms "idle mode", "DRX" and "CDRX" are explicitly intended to include at least the full extent of their ordinary meaning, and are intended to include similar types of modes in future standards.

Collection of a synchronization beacon

As described above, a UE may use a single radio (e.g., with a single transmit chain and a single receive chain, although a single transmit chain and dual receive chains are contemplated) to communicate using two different RATs. For example, the UE may use a single radio to communicate using a first RAT and may periodically off-set to perform different actions for a second RAT, such as page decoding, measurement, synchronization, etc. In this example, the UE may do so be considered as maintaining a connection to both RATs using the same radio, even though it can only communicate using a single RAT. It should be noted that the radio can be the sole cellular radio for the UE or can be one of a variety of cellular radios. In a multiple radio embodiment, one of the cellular radios may be used to time-share the first RAT and the second RAT. In addition, the UE Implement Dual SIM Dual Active (DSDA) and/or Dual SIM Dual Standby (DSDS) as desired.

In one embodiment, the first RAT can be LTE and the second RAT can be GSM, although other combinations of RAT are contemplated. In certain cases it may be typical to periodically off set to perform synchronization for the second RAT (e.g. for neighboring base stations of the current base station of the second RAT). In the following, the first RAT can be described as LTE and the second RAT can be described as GSM, but these descriptions can be applied to other RATs as desired.

Compared to CDMA 2000 1x, SRLTE for GSM can show significant differences. For example, GSM path adjustment (e.g. for side decoding) may be 10 times more frequent (e.g. at least once every 470 ms) than 1x path adjustment, which occurs once every 5.21 s. In addition, in most cases, the duration of each GSM path setup can be very short, e.g. B. 10-20 ms, while the duration of 1x travel adjustment can be 90-100 ms in most cases.

However, there may be situations where synchronization procedures for GSM may take a significant amount of time, which may reduce LTE throughput, because the LTE network interprets the radio's path setting to GSM as a deep fading event and uses coding and modulation schemes and/or or reduce resource block allocation. As an example, in an area where GSM coverage is weak, or many GSM cells are accumulated (e.g. in a typical urban area), GSM tone detection can take a long time to search many new or lost GSM cells take to complete. For example, to detect a GSM cell, the UE may need to continuously receive radio frequency signals of at least 10 GSM frames (total 46ms) and search for the location of the FCCH slot or burst within these 10 frames. In addition, to typically avoid missing detection of the FCCH slot, multiple (e.g., two or three) 10-GSM frames are required. However, as mentioned above, LTE phasing out for this period of time can cause significant throughput problems for LTE when using one radio for both LTE and GSM. For example, the LTE network may throttle grant/MCS allocation dramatically when a large burst of missed LTE frames occur in a row or over a short period of time. Thus, some of these problems can be solved by spreading the GSM tone detection from one long path setup to several shorter path setups over a longer period of time. For example, by spreading the tone detection, the LTE network can detect multiple fast fading over a longer period of time than continuous deep fading, which can result in a lower mean block error rate (BLER). This lower BLER can avoid triggering a dramatic drop in grant or MCS for LTE.

In one embodiment, the first 10 GSM frame period may be continuously sampled for lower GSM received signal strength indicators (RSSI) (e.g., less than or equal to -90 dBm). FCCH tone detection can be performed on the samples and then confirmed for the second and third 10 GSM frame periods. However, to confirm, the UE may read different 10ms long samples from each 10GSM frame period within a set of five 10GSM frame periods. Then these four pieces of 10ms samples can be combined to form a 50ms sample that can be used for tone detection, e.g. B. as a single 10 GSM period.

For higher GSM RSSI even the first 10 GSM frame period samples can be read over several 10 GSM frame periods if desired.

In addition, the tone detection can be routed via a line. For example, according to the 10ms samples, tone detection can be performed on each available received 10ms sample while the next 10ms samples are received or sampled. Thus, when all samples are collected, the final tone detection can be used as a quick confirmation of the tone detection already performed on the 10ms samples.

According to these embodiments, there can be a dramatic improvement in LTE throughput for this situation, e.g. e.g. a deterioration of 40-50% can be reduced to below 20%.

Figure 6 - Intermittent capture of synchronization beacons

6 Figure 12 is a flow chart illustrating a method for performing an interrupted detection of a synchronization beacon. The method may be performed by a UE device (such as UE 106) using a first radio for both a first RAT and a second RAT (e.g. LTE and GSM, although other combinations of RAT are contemplated) . This in 6 The method shown may be used in conjunction with any of the systems or devices shown in the figures above, among other devices. In various embodiments, some of the method elements shown may be performed simultaneously, in a different order than shown, or may be omitted. It must be noted that additional procedural elements can also be performed as desired. The method may be performed as follows: As shown in 602, the UE may communicate using a first RAT via the first radio. For example, the UE may perform data communication using the first RAT, or more generally, the first radio may be currently used for first RAT communication. In 604, the UE can send a request to perform synchronization, e.g. B. for neighboring base stations, the second RAT received. To perform synchronization, the UE may perform synchronization beacon detection (e.g., tone detection such as detecting an FCCH burst for GSM). As described above, the synchronization beacon can be retransmitted in a periodic manner. For example, the synchronization beacon may appear once during each repeated time period or time period (as an "on first time period" or "first time period" with respect to 6 denotes how every 10 GSM frames are transmitted in GSM embodiments).

In 606, the UE may repeatedly search for the synchronization beacon in different sub-parts of the first time period over successive transmissions. More specifically, the UE may search for the synchronization beacon over the first time period, but may not need to search for a single instance of the first time period (in other words, the search may be over multiple first time periods). As a specific example, the UE may continue to search first n-frames of the first time period in a first instance of the time period, the second n-frames in a second instance of the second time period, and so on until the entire time period has been searched, over a plurality of instances of the time period.

7 FIG. 12 illustrates an example timing diagram showing the difference of continuous detection and intermittent detection of the synchronization beacon. In particular, 700 illustrates continuous detection of the synchronization beacon. In this example, the UE may perform synchronization beacon detection over the first 10 frames (e.g., according to a GSM embodiment). As shown, the FCCH beacon may be transmitted between the 6th and 8th frames of the 10 frames, every 10 frames (e.g., an exemplary first time period as described above). In contrast, 750 shows an example interrupted detection. In this example, the UE may perform a sampling or measurement for only one frame every 10 frames and combine these samples together to perform synchronization beacon detection. In this example, the UE may sample the first frame of the first 10 frames, the second frame of the second 10 frames, the third frame of the third 10 frames, etc. to generate a 'stitched' 10-frame period used for detection a synchronization beacon can be used (in this case detection of the FCCH beacon). As another example, a 10ms sample can be run that uses multiple frames instead of the ones in 7 single frames shown. In general, any desired scanning can be used, and the scanning described and illustrated in FIG 7 is only an example.

In one embodiment, the detection of a synchronization beacon can be passed over a wire, e.g. B. it may include sampling a portion of the first time period and performing detection of a synchronization beacon from that sample before the next sample is performed (although there may be other delays, such as performing detection on a sample two samples earlier was received). In this embodiment, it may be possible to detect the synchronization beacon without having to sample the entire first period. In one embodiment, when the synchronization beacon is detected, the search can be changed.

In some embodiments, upon detection of the synchronization beacon, an acknowledgment of the synchronization beacon may be performed. For example, the location of the synchronization beacons can be sampled one or more times in subsequent first time periods to confirm the synchronization beacon. Alternatively or additionally, the search can be simply confirmed or performed over multiple instances of the first time period (e.g. by combining more than a single amount of a first time period together, such as 10-frames for GSM).

In one embodiment, the method can use both continuous and intermittent detection. For example, an initial continuous detection may be performed followed by an intermittent detection to acknowledge the synchronization beacon. As a specific example for GSM, the 10 frames can initially be sampled continuously be detected, followed by detection of the synchronization beacons within the sampled 10 frames. After this detection, an acknowledgment of the synchronization beacon can be performed for two additional 10-frame periods, but in an intermittent manner (e.g., each sampled 10-frame period is formed from a plurality of 10-frame periods). Alternatively or additionally, the UE may simply perform acknowledgment by sampling the particular frame(s) of the 10-frame period corresponding to the location of the detected synchronization beacon, rather than performing intermittent detection over the entire 10-frame period.

In one embodiment, this continuous detection followed by an intermittent detection may be performed when a channel quality indicator (e.g., a signal quality indicator such as an RSSI, among other indicators) of the second RAT is below a threshold. If the channel quality indicator is above the threshold, an interrupted detection can be performed, e.g. B. for both initial detection and confirmation without using continuous detection. In one embodiment, the threshold may be an RSSI value of approximately -90 dBm. For example, this approximate value can vary +/- 10dBm from -90dBm if desired.

During intermittent detection, the UE may alternate between using the first radio for the first RAT (e.g. for data communication) using the first radio to perform the synchronization beacon search (and possibly other activities such as side detection) for the second RAT . As a result, the UE can avoid deep fading conditions in the first RAT due to a long path setup to perform continuous detection of a synchronization beacon in the second RAT, which can avoid a significant throughput loss for the first RAT.

Using a frequency error estimate of a first RAT for a second RAT

As described above, a UE can use a single radio (e.g., with a single transmit chain and a single receive chain) to communicate using two different RATs. For example, the UE may use a single radio to communicate using a first RAT and may periodically off-set to perform different actions for a second RAT, such as page decoding, measurement, synchronization, etc. In this example, the UE may do so be considered as maintaining a connection to both RATs using the same radio, even though it can only communicate using a single RAT. It must be noted that the radio can be the sole cellular radio for the UE or can be one of a variety of cellular radios. In a multiple radio embodiment, a cellular radio may be used to time share the first RAT and second RAT. Additionally, the UE can implement Dual SIM Dual Active (DSDA) and/or Dual SIM Dual Standby (DSDS), as desired.

In one embodiment, the first RAT can be LTE and the second RAT can be GSM, although other combinations of RAT are contemplated. In some cases, it may be typical to periodically off-tune to perform synchronization for the second RAT (e.g., for neighboring base stations of the second RAT's current base station).

In the following, the first RAT can be described as LTE and the second RAT can be described as GSM, but these descriptions can be applied to other RATs as desired. The LTE DRX cycle can be around 1.28s. In addition, the GSM DRX cycle can take place every 470 ms. A GSM frequency error estimation (FEE) typically takes 200-500 ms and can be performed after several cycles of GSM DRX sleep and wake-up. The FEE is generally performed because there are frequency errors from the crystal oscillator used when GSM is sleeping (e.g. the GSM associated software stack, GSM associated radio frequency circuitry, and/or other portions of the UE). On wakeup, if the frequency error is greater than a threshold and is not corrected, GSM TX/RX will be tuned to an incorrect frequency and the network may not be able to decode the UE's transmission. Similarly, the UE may not be able to decode the network's response. Although GSM FEE is not common, e.g. B. typically occurring every 10-50 s, if it occurs it can have a major impact on the LTE performance for GSM-SRLTE or DSDS/DSDA. In particular, this extremely long path setting of LTE can dramatically decrease LTE throughput performance.

• In SRLTE mit GSM, weil LTE und GSM dieselbe Funkfrequenzschaltung (oder zumindest einen Teil der Funkfrequenzschaltung) zeitlich teilen, können sie auch denselben Kristalloszillator verwenden, wenn sie schlafen. Zusätzlich führt LTE auch FEE nach mehreren Zyklen von LTE Sleep und Wake-up durch. Somit, wenn LTE aktiv ist, obwohl GSM mehrere Zyklen von Sleep und Wake-up hat, braucht GSM nicht, FEE selber zu machen, sondern GSM kann direkt das FEE-Ergebnis für LTE verwenden (oder die Effekte von FEE von LTE können auch den Bedarf adressieren, FEE für GSM durchzuführen). Zum Beispiel, in diesen Ausführungsformen, wenn FEE für LTE durchgeführt wird, kann der mit der Durchführung von GSM FEE assoziierte Takt zurückgesetzt werden, weil LTE FEE für GSM FEE verwendet werden kann.

Thus, reducing the number of times GSM FEE is performed can improve this performance, especially for LTE when both GSM and LTE are used over the same radio. The following embodiments may be useful in reducing the frequency or occurrences of GSM FEE:

• In SRLTE with GSM, because LTE and GSM share the same radio frequency circuit (or at least part of the radio frequency circuit) in time, they can also use the same crystal oscillator when sleeping. Additionally, LTE also performs FEE after multiple cycles of LTE sleep and wake-up. Thus, when LTE is active, although GSM has several cycles of sleep and wake-up, GSM does not need to make FEE itself, but GSM can directly use the FEE result for LTE (or the effects of FEE of LTE can also use the Address need to perform FEE for GSM). For example, in these embodiments, when FEE is performed for LTE, the clock associated with performing GSM FEE may be reset because LTE FEE may be used for GSM FEE.

However, when LTE (e.g. the software stack associated with LTE, the radio frequency circuitry associated with LTE, and/or other portions of the UE) is asleep and when the GSM FEE timer expires, i. H. the maximum time has been reached that GSM has not performed FEE since the last FEE and Sleep, GSM can perform its FEE.

The above embodiments can limit the occurrence of GSM FEE to the cases where LTE is in sleep and as a result can almost eliminate the influence of a FEE long path setting on the LTE throughput performance. Thus, the above embodiments can limit degradation to access delay when LTE is sleep wakeup from CDRX.

Figure 8 - Using frequency error estimation of a first RAT for a second RAT

8th Figure 12 is a flow chart illustrating a method for using a frequency error estimate of a first RAT for a second RAT. The procedure of 8th can be performed by a UE device (such as UE 106) using a first radio for both the first RAT and the second RAT (e.g., LTE and GSM, although other combinations of RAT are contemplated). This in 8th The method shown may be used in conjunction with any of the systems or devices shown in the figures above, among other devices. In various embodiments, some of the method elements shown may be performed simultaneously, in a different order than shown, or may be omitted. It must be noted that additional process elements can also be performed as desired. The procedure can be carried out as follows. In 802, the UE may operate the first radio according to the first RAT. For example, a software stack associated with the first RAT may periodically use the first radio in performing communications using the first RAT. References to the first RAT performing actions or sleeping may refer to that first RAT software stack being executed to perform those actions or sleeping.

In 804, the UE may operate the first radio according to the second RAT. For example, similar to the above, a software stack associated with the second RAT may periodically use the first radio in performing communications using the second RAT. References to the first RAT performing actions or sleeping may refer to this second software stack being executed to perform those actions or sleeping.

When operating under the first RAT, the first radio may have a lower frequency (or periodicity) of sleep and wake-up cycles than when operating under the second RAT, which has a greater frequency (or periodicity) of sleep and wake-up -Cycles may have. For example, the first RAT may have a cycle (e.g., a DRX cycle) that lasts 1.28 s, while the second RAT may have a cycle (e.g., a DRX cycle) that lasts 470 ms . Additionally, the first radio may use a first clock to operate according to both the first RAT and the second RAT. For example, the first clock may be used for the first RAT during sleep cycles and may also be used for the second RAT during sleep cycles. The first clock can be operated based on an oscillator (e.g. a crystal oscillator) of the UE.

A frequency error estimation (FEE) may be performed periodically for both the first RAT and the second RAT to ensure that the first clock is within an appropriate tolerance for communicating using the first RAT and/or the second RAT, for example at wake up from sleep. However, since the first clock is shared between the first RAT and the second RAT, it may be possible to use the results of the FEE for one of the RATs for the other RAT without having to perform the FEE for both RATs.

Thus, if the first radio is used for both the first RAT and the second RAT, a FEE of the first RAT can use it for the second Allow RAT to skip performing a FEE of the second RAT. For example, the first RAT can be LTE and the second RAT can be GSM. In one embodiment, a FEE for the first RAT (in this example, LTE) may be performed during operation (e.g., this FEE may be performed periodically, such as according to a FEE timer of the first RAT). For example, the FEE for the first RAT may be performed after multiple sleep and wake-up cycles associated with the first RAT, e.g. B. a predefined number of cycles.

During this period, the first radio can be used for both the first RAT and the second RAT. The second RAT can also be configured to perform the FEE for the second RAT periodically, e.g. B. according to their own FEE timer. For example, the timer can be used to indicate when a FEE can be performed for the second RAT. If the FEE is performed for the first RAT, however, the need to perform the FEE for the second RAT may no longer be necessary, e.g. B. because the results of the FEE can adjust the first clock or be used by the second RAT to adjust the first clock or another clock if desired. For example, in one embodiment, adjusting the first clock based on the FEE of the first RAT may resolve a need to perform FEE and a first clock adjustment for the second RAT. In one embodiment, the timer for the second RAT can be reset simply when performing the FEE for the first RAT. Alternatively, measurements or adjustments determined by the FEE of the first RAT may be usable for measurements or adjustments for the second RAT without having to perform a new FEE for the second RAT. Even further if separate clocks are used for the first and second RAT, e.g. B., and they are based on the same oscillator, the FEE of the first RAT can be used to adjust the clock of the second RAT. Thus, in this embodiment, the results of the FEE of the first RAT can be used for the second RAT without performing a separate FEE for the second RAT, resulting in path settings of the first radio from the first RAT to the second RAT for the purpose of performance of FEE of the second RAT can significantly reduce or eliminate, which can reduce throughput degradation of the first RAT.

Thus, in 806, a FEE can be performed for the first RAT and thus a FEE for the second RAT can potentially be avoided, as described above. Later, in 808, a FEE can be performed for the second RAT. In one embodiment, the FEE for the second RAT may be performed in situations where the RAT is dormant or has not been used recently and a FEE for the first RAT was not recent enough. For example, if the first RAT is sleeping and a timer to perform FEE for the second RAT expires, the FEE for the second RAT can be performed.

Exemplary Embodiments

1. 1. Verfahren zum Betreiben einer UE-Vorrichtung, wobei das Verfahren folgendes umfasst: bei einer Benutzerausrüstungsvorrichtung (UE) umfassend ein erstes Funkgerät, wobei das erste Funkgerät dazu konfigurierbar ist, gemäß einer ersten Funkzugangstechnologie (RAT) und einer zweiten RAT betrieben zu werden: Ausführen von Kommunikation gemäß der ersten RAT auf dem ersten Funkgerät mit einer Basisstation; Empfangen einer Anfrage, eine Weg-Einstellung durchzuführen, um einen Synchronisierungsbeacon auf der zweiten RAT zu detektieren, wobei der Synchronisierungsbeacon in sukzessiven ersten Zeitperioden wiederholt auftritt; in Antwort auf die Anfrage, wiederholtes Ausführen einer Suche nach dem Synchronisierungsbeacon in unterschiedlichen Unterabschnitten der ersten Zeitperiode über sukzessive erste Zeitperioden, wobei die Suche wiederholt ausgeführt wird, bis der Synchronisierungsbeacon in einem jeweiligen Unterabschnitt einer der sukzessiven Zeitperioden lokalisiert ist.
2. 2. Verfahren nach Absatz 1, weiterhin umfassend: Bestimmen einer Kanalqualität der zweiten RAT; und Vergleichen der Kanalqualität mit einem Schwellenwert; wobei das wiederholte Ausführen der Suche nach dem Synchronisierungsbeacon basierend auf dem Vergleichen der Kanalqualität mit dem Schwellenwert ausgeführt wird.
3. 3. Verfahren nach Absatz 2, bei welchem der Schwellenwert ungefähr -90dBm ist.
4. 4. Verfahren nach Absatz 2, bei welchem das Bestimmen der Kanalqualität ein Bestimmen eines empfangenen Signalstärkenindikators (RSSI) der zweiten RAT umfasst.
5. 5. Verfahren nach Absatz 2, bei welchem, wenn die Kanalqualität weniger als der Schwellenwert ist, das Verfahren folgendes umfasst: Ausführen einer Suche nach dem Synchronisierungsbeacon in einer einzigen ersten Zeitperiode; wobei das wiederholte Ausführen der Suche nach dem Synchronisierungsbeacon in unterschiedlichen Unterabschnitten der ersten Zeitperiode über sukzessive erste Zeitperioden zusätzlich zur Suche nach dem Synchronisierungsbeacon in der einzigen ersten Zeitperiode durchgeführt wird.
6. 6. Verfahren nach Absatz 5, bei welchem, wenn die Kanalqualität über dem Schwellenwert liegt, das wiederholte Ausführen der Suche durchgeführt wird, statt die Suche nach dem Synchronisierungsbeacon in einer einzigen ersten Zeitperiode durchzuführen.
7. 7. Verfahren nach einem beliebigen der Absätze 1-6, bei welchem das wiederholte Ausführen der Suche folgendes umfasst: Abtasten eines ersten Unterabschnitts der ersten Zeitperiode in einer ersten sukzessiven Zeitperiode; Ausführen der Detektion des Synchronisierungsbeacons des ersten Unterabschnitts der ersten Zeitperiode in der ersten sukzessiven Zeitperiode; und gleichzeitig mit dem Ausführen der Detektion des Synchronisierungsbeacons, Abtasten eines zweiten Unterabschnitts der ersten Zeitperiode in einer zweiten sukzessiven ersten Zeitperiode.
8. 8. Verfahren nach einem beliebigen der Absätze 1-7, bei welchem das wiederholte Ausführen eine Basisstation der ersten RAT dazu veranlasst, mehrere Quick Fading-Instanzen für die UE über die erste Zeitperiode zu beobachten, was zu einer niedrigeren mittleren Blockfehlerrate (BLER) als beim Ausführen der Detektion des Synchronisierungsbeacon in einer einzigen ersten Zeitperiode führt.
9. 9. Verfahren nach einem beliebigen der Absätze 1-8, bei welchem die erste RAT Long Term Evolution (LTE) umfasst, und bei welchem die zweite RAT Global System for Mobile Communications (GSM) umfasst.
10. 10. Verfahren nach einem beliebigen der Absätze 1-9, bei welchem der Synchronisierungsbeacon einen Burst auf einem Frequenzkorrekturkanal (FCCH) der zweiten RAT umfasst.
11. 11. Benutzerausrüstungsvorrichtung (UE), die dazu eingerichtet ist, eine selektive Nachbarschaftszellenmessung durchzuführen, umfassend: ein erstes Funkgerät, wobei das erste Funkgerät dazu eingerichtet ist, Kommunikation unter Verwendung von Long Term Evolution (LTE) und Gobal System for Mobile Communications (GSM) durchzuführen und eine Verbindung zu sowohl LTE als auch GSM aufrechtzuerhalten; und einen oder mehrere Prozessoren, die mit dem ersten Funkgerät gekoppelt sind, wobei der eine oder die mehreren Prozessoren und das erste Funkgerät eingerichtet sind zum: Ausführen von LTE-Kommunikation mit einer LTE-Basisstation unter Verwendung des ersten Funkgeräts; während des Ausführens von LTE-Kommunikation mit der LTE-Basisstation, wiederholtes Ausführen einer Suche nach einem Synchronisierungsbeacon für GSM in unterschiedlichen Unterabschnitten der ersten Zeitperiode über sukzessive erste Zeitperioden, wobei die Suche wiederholt ausgeführt wird, bis der Synchronisierungsbeacon in einem jeweiligen Unterabschnitt einer der sukzessiven Zeitperioden lokalisiert wird, wobei das Ausführen der Suche nach dem Synchronisierungsbeacon unter Verwendung des ersten Funkgeräts durchgeführt wird und wobei der Synchronisierungsbeacon von einer Basisstation von GSM übertragen wird.
12. 12. UE nach Absatz 11, wobei der eine oder die mehreren Prozessoren weiterhin eingerichtet sind zum: Bestimmen einer Kanalqualität von GSM; und Vergleichen der Kanalqualität mit einem Schwellenwert; wobei das wiederholte Ausführen der Suche nach dem Synchronisierungsbeacon basierend auf einem Vergleichen der Kanalqualität mit dem Schwellenwert durchgeführt wird.
13. 13. UE nach Absatz 12, wobei das Bestimmen der Kanalqualität ein Bestimmen einer Signalstärke der Basisstation von GSM umfasst.
14. 14. UE nach Absatz 12, wobei, wenn die Kanalqualität weniger als der Schwellenwert ist, das Verfahren folgendes umfasst: Ausführen einer Suche nach dem Synchronisierungsbeacon in einer einzigen ersten Zeitperiode; wobei das wiederholte Ausführen der Suche nach dem Synchronisierungsbeacon in den unterschiedlichen Unterabschnitten der ersten Zeitperiode über sukzessive erste Zeitperioden zusätzlich zur Suche nach dem Synchronisierungsbeacon in der einzigen ersten Zeitperiode durchgeführt wird.
15. 15. UE nach einem beliebigen der Absätze 11-12, wobei die erste Zeitperiode 10-GSM-Frames umfasst, wobei das Synchronisierungsbeacon einen Frequenzkorrekturkanal (FCCH)-Burst umfasst.
16. 16. UE nach einem beliebigen der Absätze 11-15, wobei das wiederholte Ausführen der Suche folgendes umfasst: Abtasten eines ersten Unterabschnitts der ersten Zeitperiode in einer ersten sukzessiven ersten Zeitperiode; Ausführen einer Detektion eines Synchronisierungsbeacons des ersten Unterabschnitts der ersten Zeitperiode in der ersten sukzessiven ersten Zeitperiode; und, gleichzeitig mit dem Ausführen der Detektion eines Synchronisierungsbeacons, Abtasten eines zweiten Unterabschnitts der ersten Zeitperiode in einer zweiten sukzessiven ersten Zeitperiode.
17. 17. UE nach einem beliebigen der Absätze 11-16, wobei die UE zwei Smartcards umfasst, die je dazu eingerichtet sind, SIM (Subscriber Identity Module)-Funktionalität zu implementieren, wobei die UE dazu eingerichtet ist, DSDA (Dual SIM Dual Active)-Funktionalität unter Verwendung des ersten Funkgeräts zu implementieren.
18. 18. Nicht transitorisches, computerzugängliches Speichermedium zum Speichern von Programminstruktionen zum Ausführen einer selektiven Messung durch eine Benutzerausrüstungsvorrichtung (UE), wobei die UE ein erstes Funkgerät zum Kommunizieren unter Verwendung einer ersten Funkzugangstechnologie (RAT) und einer zweiten RAT umfasst, wobei die Programminstruktionen durch einen Prozessor ausführbar sind zum: Ausführen einer ersten RAT-Übertragung mit einer ersten RAT-Basisstation unter Verwendung des ersten Funkgeräts; Empfangen einer Anfrage, eine zweite RAT Weg-Einstellung auszuführen, um nach einem zweiten RAT Synchronisierungsbeacon zu suchen; in Antwort auf die Anfrage, Ausführen einer Vielzahl von zweiten RAT Weg-Einstellungsoperationen, die über eine erste Zeitperiode verteilt sind, wobei jede der Vielzahl von zweiten RAT Weg-Einstellungsoperationen kürzer als eine Standard zweite RAT Weg-Einstellungsoperation zum Suchen nach dem zweiten RAT Synchronisierungsbeacon ist, wobei die erste Zeitperiode länger als die Standard zweite RAT Weg-Einstellungsoperation zum Suchen nach dem zweiten RAT Synchronisierungsbeacon ist.
19. 19. Nicht transitorisches, computerzugängliches Speichermedium nach Anspruch 18, wobei die zweite RAT Gobal System for Mobile Communications (GSM) umfasst, und wobei das Synchronisierungsbeacon einen Burst auf einem Frequenzkorrekturkanal (FCCH) umfasst.
20. 20. Nicht transitorisches, computerzugängliches Speichermedium nach Anspruch 18, wobei der Synchronisierungsbeacon alle n-Frames wiederholt gesendet wird, wobei das Ausführen einer Vielzahl von zweiten RAT Weg-Einstellungsoperationen folgendes umfasst: Abtasten eines ersten Unterabschnitts eines ersten Satzes von n-Frames; Ausführen einer Detektion eines Synchronisierungsbeacons des ersten Unterabschnitts des ersten Satzes von n-Frames; und, gleichzeitig mit dem Ausführen der Detektion des Synchronisierungsbeacons, Abtasten eines zweiten Unterabschnitts eines zweiten Satzes von n-Frames, wobei der erste Unterabschnitt ein unterschiedlicher Unterabschnitt des ersten Satzes von n-Frames ist, als der zweite Unterabschnitt im zweiten Satz von n-Frames ist.
21. 21. Verfahren umfassend: Bei einer Benutzerausrüstungsvorrichtung (UE) umfassend ein erstes Funkgerät, wobei das erste Funkgerät dazu konfigurierbar ist, gemäß einer ersten Funkzugangstechnologie (RAT) und einer zweiten RAT betrieben zu werden: Betreiben des ersten Funkgeräts der UE gemäß der ersten RAT, wobei das erste Funkgerät eine niedrigere Frequenz von Sleep- und Wake-up-Zyklen beim Betrieb gemäß der ersten RAT aufweist; Betreiben des ersten Funkgeräts gemäß der zweiten RAT, wobei das erste Funkgerät eine größere Frequenz von Sleep- und Wake-up-Zyklen beim Betrieb gemäß der zweiten RAT aufweist; wobei das erste Funkgerät einen ersten Takt für jede der ersten RAT und der zweiten RAT verwendet, wobei der erste Takt basierend auf einem Oszillator in der UE betrieben wird; wenn das Funkgerät gemäß der ersten RAT betrieben wird, nach einer Vielzahl von Zyklen von Sleep und Wake-up für die erste RAT, Ausführen einer Frequenzfehlereinschätzung (FEE) des ersten Takts und Einstellen des ersten Takts basierend auf der FEE, wobei das Ausführen der FEE und das Einstellen des ersten Takts während des Betriebs gemäß der ersten RAT betrieben wird, um eine Frequenz des Funkgeräts zu reduzieren, das eine FEE ausführt und den ersten Takt beim Betrieb gemäß der zweiten RAT einstellt.
22. 22. Verfahren nach Absatz 21, weiterhin umfassend: Betreiben einer zweiten RAT FEE-Schaltuhr, die bei Ablauf anzeigt, dass eine FEE- und Takteinstellung ausgeführt werden sollte, wobei die zweite RAT FEE-Schaltuhr bei Ausführen der FEE des ersten Takts für die erste RAT zurückgesetzt wird.
23. 23. Verfahren nach Absatz 22, weiterhin umfassend: wobei, wenn die erste RAT in einem Schlafabschnitt ihrer Sleep- und Wake-up-Zyklen bei Ablauf der zweiten RAT FEE-Schaltuhr ist, Ausführen einer FEE des ersten Takts in Antwort darauf, dass die erste RAT in einem Schlafabschnitt ihrer Sleep- und Wake-up-Zyklen bei Ablauf der zweiten RAT FEE-Schaltuhr ist.
24. 24. Verfahren nach einem beliebigen der Absätze 21-23, weiterhin umfassend: Verwenden der FEE der ersten RAT, um den ersten Takt für die zweite RAT einzustellen.
25. 25. Verfahren nach einem beliebigen der Absätze 21-24, wobei das erste Funkgerät den ersten Takt für die erste RAT während Sleep-Zyklen verwendet, die mit der ersten RAT assoziiert sind, und für die zweite RAT während Sleep-Zyklen, die mit der zweiten RAT assoziiert sind.
26. 26. Verfahren nach einem beliebigen der Absätze 21-25, wobei die UE nur ein einziges Funkgerät zum Ausführen von zellularer Kommunikation umfasst, wobei das erste Funkgerät das einzige Funkgerät ist.
27. 27. Verfahren nach einem beliebigen der Absätze 21-26, wobei die UE zwei Smartcards umfasst, die je dazu eingerichtet sind, SIM (Subscriber Identity Module)-Funktionalität zu implementieren, wobei die UE dazu eingerichtet ist, DSDA (Dual SIM Dual Active)-Funktionalität unter Verwendung des ersten Funkgeräts zu implementieren.
28. 28. Verfahren nach einem beliebigen der Absätze 21-27, wobei die erste RAT Long Term Evolution (LTE) umfasst.
29. 29. Verfahren nach einem beliebigen der Absätze 21-28, wobei die zweite RAT Global System for Mobile Communications (GSM) umfasst.
30. 30. Verfahren nach einem beliebigen der Absätze 21-29, wobei der Oszillator einen Kristalloszillator umfasst.
31. 31. Benutzerausrüstungsvorrichtung (UE), die dazu eingerichtet ist, eine selektive Nachbarschaftszellenmessung durchzuführen, umfassend: einen Oszillator; ein erstes Funkgerät, das mit dem Oszillator gekoppelt ist, wobei das erste Funkgerät dazu eingerichtet ist, Kommunikation unter Verwendung einer ersten Funkzugangstechnologie (RAT) und einer zweiten RAT durchzuführen und eine Verbindung mit sowohl der ersten RAT als auch der zweiten RAT aufrechtzuerhalten, und wobei das erste Funkgerät den Oszillator für sowohl die erste RAT als auch die zweite RAT verwendet; und einen oder mehrere Prozessoren, die mit dem ersten Funkgerät gekoppelt sind, wobei der eine oder die mehreren Prozessoren und das erste Funkgerät dazu eingerichtet sind zum: Einrichten des ersten Funkgeräts unter Verwendung einer ersten Software, die mit der ersten RAT assoziiert ist; Einrichten des ersten Funkgeräts unter Verwendung einer zweiten Software, die mit der zweiten RAT assoziiert ist, wobei die erste Software das erste Funkgerät mit einer niedrigeren Frequenz von Sleep- und Wake-up-Zyklen für die erste RAT betreibt als die zweite Software das erste Funkgerät für die zweite RAT betreibt; wenn das Funkgerät unter Verwendung der ersten Software und beim Betrieb gemäß der ersten RAT eingerichtet ist, führt die erste Software eine Frequenzfehlereinschätzung (FEE) an dem ersten Takt durch, der auf dem Oszillator, basiert und stellt den ersten Takt basierend auf der FEE ein, wobei die erste Software die FEE betreibt, um eine Frequenz der zweiten Software zu reduzieren, die eine FEE durchführt.
32. 32. UE nach Absatz 31, wobei das erste Funkgerät den ersten Takt für sowohl die erste RAT als auch die zweite RAT verwendet, wobei das Ausführen der FEE ein Einstellen des ersten Takts umfasst.
33. 33. UE nach einem beliebigen der Absätze 31-32, wobei das erste Funkgerät den ersten Takt während Sleep-Zyklen verwendet, die mit der ersten RAT assoziiert sind, und wobei das erste Funkgerät den ersten Takt während Sleep-Zyklen verwendet, die mit der zweiten RAT assoziiert sind.
34. 34. UE nach einem beliebigen der Absätze 31-33, wobei die zweite Software dazu eingerichtet ist, eine zweite RAT FEE-Schaltuhr zu betreiben, die bei Ablauf anzeigt, dass eine FEE durchgeführt werden sollte, wobei die zweite RAT FEE-Schaltuhr bei Ausführen der FEE des ersten Takts für die erste RAT zurückgesetzt wird.
35. 35. UE nach Absatz 34, wobei, wenn die erste RAT in einem Sleep-Abschnitt ihrer Sleep- und Wake-up-Zyklen bei Ablauf der zweiten RAT FEE-Schaltuhr ist, die zweite Software dazu eingerichtet ist, eine FEE in Antwort darauf auszuführen, dass die erste RAT in einem Sleep-Abschnitt ihrer Sleep- und Wake-up-Zyklen bei Ablauf der zweiten RAT FEE-Schaltuhr ist.
36. 36. UE nach einem beliebigen der Absätze 31-35, wobei die zweite Software dazu eingerichtet ist, Ergebnisse der FEE zu verwenden, um einen Takt für die zweite RAT einzustellen.
37. 37. UE nach einem beliebigen der Absätze 31-36, wobei die UE nur ein einziges Funkgerät zum Ausführen von zellularer Kommunikation umfasst, wobei das erste Funkgerät das einzige Funkgerät ist.
38. 38. UE nach einem beliebigen der Absätze 31-37, wobei die UE zwei Smartcards umfasst, die je dazu eingerichtet sind, SIM (Subscriber Identity Module)-Funktionalität zu implementieren, wobei die UE dazu eingerichtet ist, DSDA (Dual SIM Dual Active)-Funktionalität unter Verwendung des ersten Funkgeräts zu implementieren.
39. 39. UE nach einem beliebigen der Absätze 31-38, wobei die erste RAT Long Term Evolution (LTE) umfasst, und wobei die zweite RAT Global System for Mobile Communications (GSM) umfasst.
40. 40. Nicht transitorisches, computerzugängliches Speichermedium zum Speichern von Programminstruktionen zum Ausführen einer selektiven Messung durch eine Benutzerausrüstungsvorrichtung (UE), wobei die UE ein erstes Funkgerät zum Kommunizieren unter Verwendung einer ersten Funkzugangstechnologie (RAT) und einer zweiten RAT umfasst, wobei die Programminstruktionen durch einen Prozessor ausführbar sind zum: Betreiben des ersten Funkgeräts der UE gemäß der ersten RAT; Betreiben des ersten Funkgeräts gemäß der zweiten RAT, wobei das erste Funkgerät eine niedrigere Frequenz von Sleep- und Wake-up-Zyklen beim Betrieb gemäß der ersten RAT aufweist als beim Betrieb gemäß der zweiten RAT, wobei das erste Funkgerät einen ersten Takt für jede der ersten RAT und der zweiten RAT verwendet; wenn das Funkgerät gemäß der ersten RAT betrieben wird, Ausführen einer Frequenzfehlereinschätzung (FEE) des ersten Takts und Einstellen des ersten Takts basierend auf der FEE, wobei das Ausführen der FEE und das Einstellen des ersten Takts beim Betrieb gemäß der ersten RAT betrieben wird, um eine Frequenz des Funkgeräts zu reduzieren, das eine FEE durchführt, und Einstellen des ersten Takts beim Betrieb gemäß der zweiten RAT.
41. 41. Verfahren zum Betreiben einer UE-Vorrichtung, wobei das Verfahren folgendes umfasst: auf einer UE-Vorrichtung, die ein erstes Funkgerät umfasst, das gleichzeitig eine erste Funkzugangstechnologie (RAT) und eine zweite RAT unterstützt: Ausführen, durch die UE, einer Übertragung gemäß der ersten RAT auf dem ersten Funkgerät mit einer Basisstation; Empfangen einer Anfrage, eine Weg-Einstellung durchzuführen, um einen Synchronisierungsbeacon auf der zweiten RAT zu detektieren, wobei der Synchronisierungsbeacon in sukzessiven ersten Zeitperioden wiederholt auftritt; wiederholtes Ausführen einer Suche nach dem Synchronisierungsbeacon in unterschiedlichen Unterabschnitten über sukzessive erste Zeitperioden; wobei die Suche wiederholt ausgeführt wird, bis der Synchronisierungsbeacon in einem jeweiligen Unterabschnitt einer der sukzessiven Zeitperioden lokalisiert ist.
42. 42. Verfahren nach Anspruch 41, wobei das wiederholte Ausführen die LTE-Basisstation dazu veranlasst, mehrere Quick Fading-Instanzen über die erste Zeitperiode zu beobachten, was zu einer niedrigeren mittleren Blockfehlerrate (BLER) führt.
43. 43. Verfahren zum Betreiben einer UE-Vorrichtung, wobei das Verfahren folgendes umfasst: Auf einer UE-Vorrichtung, die zumindest eine Sende-/Empfangskette umfasst, und die gleichzeitig LTE-Datenübertragung und GSM-Übertragung unterstützt: Ausführen durch die UE, von LTE-Übertragung auf der zumindest einen Sende-/Empfangskette mit einer LTE-Basisstation; Empfangen einer Anfrage, eine GSM Weg-Einstellung durchzuführen, um nach einer GSM-Zelle zu suchen; Ausführen einer Vielzahl von GSM Weg-Einstellungsoperationen, die über eine erste Zeitperiode verteilt sind, wobei jede der Vielzahl von GSM Weg-Einstellungsoperationen kürzer als eine Standard GSM Weg-Einstellungsoperation ist, wobei die erste Zeitperiode länger als die Standard GSM Weg-Einstellungsoperation ist; wobei das Ausführen der Vielzahl von GSM Weg-Einstellungsoperationen die LTE-Basisstation dazu veranlasst, mehrere Quick Fading-Instanzen über die erste Zeitperiode zu beobachten, was zu einer niedrigen mittleren Blockfehlerrate (BLER) führt.
44. 44. Verfahren zum Betreiben einer Benutzerausrüstung (UE), wobei das Verfahren folgendes umfasst: Betreiben eines ersten Funkgeräts der UE gemäß einer ersten Funkzugangstechnologie (RAT), wobei das erste Funkgerät eine niedrigere Frequenz von Sleep- und Wake-up-Zyklen beim Betrieb gemäß der ersten RAT aufweist; Betreiben des ersten Funkgeräts gemäß einer zweiten RAT, wobei das erste Funkgerät eine größere Frequenz von Sleep- und Wake-up-Zyklen beim Betrieb gemäß der zweiten RAT aufweist; wobei das erste Funkgerät einen ersten Takt für jede der ersten RAT und der zweiten RAT verwendet, wobei der erste Takt basierend auf einem Oszillator in der UE betrieben wird; wenn das Funkgerät gemäß der ersten RAT betrieben wird, nach einer Vielzahl von Zyklen von Sleep und Wake-up, Ausführen einer Frequenzfehlereinschätzung (FEE) des ersten Taktsignals und Einstellen des ersten Takts basierend auf der Frequenzfehlereinschätzung; wobei das Funkgerät, das gemäß der ersten RAT betrieben wird, das die FEE durchführt, und den ersten Takt einstellt, dazu betrieben wird, um eine Frequenz des Funkgeräts zu reduzieren, das eine Frequenzfehlereinschätzung durchführt und den ersten Takt beim Betrieb gemäß der zweiten RAT einstellt.
45. 45. Verfahren nach Absatz 44, wobei die UE eine zweite RAT FEE-Schaltuhr betreibt, die bei Ablauf anzeigt, dass eine Frequenzfehlereinschätzung und Takteinstellung durch Software durchgeführt werden sollte, die das erste Funkgerät gemäß der zweiten RAT einrichtet; wobei, wenn Software, die das erste Funkgerät gemäß der ersten RAT einstellt, in einem Sleep-Abschnitt des Zyklus ist, und bei Ablauf der zweiten RAT FEE-Schaltuhr, die zweite RAT FEE durchgeführt wird.
46. 46. Verfahren zum Betreiben einer Benutzerausrüstung (UE), wobei das Verfahren folgendes umfasst: Einrichten eines ersten Funkgeräts der UE mit erster Software gemäß einer ersten Funkzugangstechnologie (RAT), wobei die erste Software eine niedrigere Frequenz von Sleep- und Wake-up-Zyklen aufweist; Einrichten des ersten Funkgeräts mit zweiter Software gemäß einer zweiten RAT, wobei die zweite Software eine größere Frequenz von Sleep- und Wake-up-Zyklen aufweist; wobei das erste Funkgerät einen ersten Takt für jede der ersten RAT und der zweiten RAT verwendet, wobei der erste Takt basierend auf einem Oszillator in der UE betrieben wird; wenn das Funkgerät gemäß der ersten Software eingerichtet ist und gemäß der ersten RAT betrieben wird, nach einer Vielzahl von Zyklen von Sleep und Wake-up, die erste Software eine Frequenzfehlereinschätzung (FEE) des ersten Taktsignals ausführt und den ersten Takt basierend auf der Frequenzfehlereinschätzung einstellt; wobei die erste Software, die die Frequenzfehlereinschätzung durchführt und den ersten Takt einstellt, betrieben wird, um eine Frequenz der zweiten Software zu reduzieren, die eine Frequenzfehlereinschätzung durchführt und den ersten Takt einstellt, wenn das Funkgerät gemäß der zweiten RAT betrieben wird.
47. 47. Verfahren nach einem beliebigen der vorherigen Ansprüche, wobei die UE zwei Smartcards umfasst, die je SIM (Subscriber Identity Module)-Funktionalität implementieren; wobei die UE DSDA (Dual SIM Dual Active)-Funktionalität implementiert.
48. 48. Verfahren, das jede Handlung oder Kombination von Handlungen enthält, wie sie im Wesentlichen hier in der detaillierten Beschreibung beschrieben sind.
49. 49. Verfahren wie im Wesentlichen hier in Bezug auf jede oder eine beliebige Kombination von 1 bis 8 oder in Bezug auf jeden oder eine Kombination von Absätzen in der detaillierten Beschreibung beschrieben.
50. 50. Drahtlose Vorrichtung, die dazu eingerichtet ist, jede Handlung oder Kombination von Handlungen durchzuführen, wie sie hier in der detaillierten Beschreibung im Wesentlichen beschrieben sind.
51. 51. Drahtlose Vorrichtung, die jede Komponente oder Kombination von Komponenten enthält, wie sie hier in der detaillierten Beschreibung beschrieben sind, wie in einer drahtlosen Vorrichtung enthalten.
52. 52. Nicht flüchtiges, computerlesbares Medium, das Instruktionen speichert, die, wenn sie ausgeführt werden, die Ausführung einer beliebigen Handlung oder Kombination von Handlungen veranlassen, wie sie im Wesentlichen hier in der detaillierten Beschreibung beschrieben sind.
53. 53. Integrierte Schaltung, die dazu eingerichtet ist, eine beliebige Handlung oder Kombination von Handlungen durchzuführen, wie sie im Wesentlichen hier in der detaillierten Beschreibung beschrieben sind.

The following numbered paragraphs describe example embodiments of the following disclosure.

1. 1. A method of operating a UE device, the method comprising: at a user equipment device (UE) comprising a first radio, the first radio being configurable to operate according to a first radio access technology (RAT) and a second RAT: performing communication according to the first RAT on the first radio with a base station; receiving a request to perform a path adjustment to detect a synchronization beacon on the second RAT, the synchronization beacon recurring in successive first time periods; in response to the query, repeatedly performing a search for the synchronization beacon in different sub-portions of the first time period for successive first time periods, the search being repeatedly performed until the synchronization beacon is located in a respective sub-portion of one of the successive time periods.
2. 2. The method of paragraph 1, further comprising: determining a channel quality of the second RAT; and comparing the channel quality to a threshold; wherein repeatedly performing the search for the synchronization beacon is performed based on comparing the channel quality to the threshold.
3. 3. The method of paragraph 2, wherein the threshold is approximately -90dBm.
4. 4. The method of paragraph 2, wherein determining the channel quality comprises determining a received signal strength indicator (RSSI) of the second RAT.
5. 5. The method of paragraph 2, wherein when the channel quality is less than the threshold, the method comprises: performing a search for the synchronization beacon in a single first time period; wherein repeatedly performing the search for the synchronization beacon in different sub-parts of the first time period successive first time periods is performed in addition to searching for the synchronization beacon in the single first time period.
6. 6. The method of paragraph 5, wherein if the channel quality is above the threshold, instead of performing the search for the synchronization beacon in a single first time period, performing the search repeatedly is performed.
7. 7. The method of any one of paragraphs 1-6, wherein repeatedly performing the search comprises: sampling a first sub-portion of the first time period in a first successive time period; performing the detection of the synchronization beacon of the first sub-portion of the first time period in the first successive time period; and concurrently with performing the detection of the synchronization beacon, sampling a second sub-portion of the first time period in a second successive first time period.
8. 8. The method of any one of paragraphs 1-7, wherein repeatedly executing the first RAT causes a base station to observe multiple quick fading instances for the UE over the first time period, resulting in a lower mean block error rate (BLER) than in performing the detection of the synchronization beacon in a single first time period.
9. 9. The method of any one of paragraphs 1-8, wherein the first RAT includes Long Term Evolution (LTE), and wherein the second RAT includes Global System for Mobile Communications (GSM).
10. 10. The method of any one of paragraphs 1-9, wherein the synchronization beacon comprises a burst on a frequency correction channel (FCCH) of the second RAT.
11. A user equipment device (UE) configured to perform a selective neighborhood cell measurement, comprising: a first radio, the first radio configured to communicate using Long Term Evolution (LTE) and Global System for Mobile Communications (GSM) perform and maintain connectivity to both LTE and GSM; and one or more processors coupled to the first radio, the one or more processors and the first radio configured to: perform LTE communication with an LTE base station using the first radio; while performing LTE communication with the LTE base station, repeatedly performing a search for a synchronization beacon for GSM in different subsections of the first time period over successive first time periods, the search being repeatedly performed until the synchronization beacon in a respective subsection of one of the successive periods of time, wherein the search for the synchronization beacon is performed using the first radio, and wherein the synchronization beacon is transmitted from a base station of GSM.
12. 12. The UE of paragraph 11, wherein the one or more processors are further configured to: determine a channel quality of GSM; and comparing the channel quality to a threshold; wherein the repetitively performing the search for the synchronization beacon is performed based on comparing the channel quality to the threshold.
13. 13. The UE according to paragraph 12, wherein determining the channel quality comprises determining a signal strength of the base station of GSM.
14. 14. The UE of paragraph 12, wherein if the channel quality is less than the threshold, the method comprises: performing a search for the synchronization beacon in a single first time period; wherein repeatedly performing the search for the synchronization beacon in the different sub-portions of the first time period over successive first time periods is performed in addition to searching for the synchronization beacon in the single first time period.
15. 15. The UE of any one of paragraphs 11-12, wherein the first time period comprises 10 GSM frames, wherein the synchronization beacon comprises a frequency correction channel (FCCH) burst.
16. 16. The UE of any one of paragraphs 11-15, wherein repeatedly performing the search comprises: sampling a first sub-portion of the first time period in a first successive first time period; performing a detection of a synchronization beacon of the first sub-portion of the first time period in the first successive first time period; and, concurrently with performing the detection of a synchronization beacon, sampling a second sub-portion of the first time period in a second successive first time period.
17. 17. The UE according to any one of paragraphs 11-16, wherein the UE comprises two smart cards, each configured to implement SIM (Subscriber Identity Module) functionality, wherein the UE is configured to implement DSDA (Dual SIM Dual Active) - implement functionality using the first radio.
18. 18. A non-transitory, computer-accessible storage medium for storing program instructions for performing a selective measurement by a user equipment device (UE), the UE comprising a first radio for communicating using a first radio access technology (RAT) and a second RAT, the program instructions being executed by a Processor operable to: perform a first RAT transmission with a first RAT base station using the first radio; receiving a request to perform a second RAT path setup to look for a second RAT synchronization beacon; in response to the request, performing a plurality of second RAT path setup operations distributed over a first time period, each of the plurality of second RAT path setup operations shorter than a standard second RAT path setup operation for searching for the second RAT synchronization beacon wherein the first time period is longer than the default second RAT path setup operation for searching for the second RAT synchronization beacon.
19. The non-transitory computer-accessible storage medium of claim 18, wherein the second RAT comprises Global System for Mobile Communications (GSM), and wherein the synchronization beacon comprises a burst on a Frequency Correction Channel (FCCH).
20. 20. The non-transitory computer-accessible storage medium of claim 18, wherein the synchronization beacon is sent repeatedly every n-frames, wherein performing a plurality of second RAT path adjustment operations comprises: sampling a first subsection of a first set of n-frames; performing a synchronization beacon detection of the first subsection of the first set of n-frames; and, concurrently with performing the detection of the synchronization beacon, sampling a second subsection of a second set of n-frames, the first subsection being a different subsection of the first set of n-frames than the second subsection in the second set of n-frames is.
21. 21. A method comprising: at a user equipment device (UE) comprising a first radio, the first radio being configurable to operate in accordance with a first radio access technology (RAT) and a second RAT: operating the first radio of the UE in accordance with the first RAT, wherein the first radio has a lower frequency of sleep and wake-up cycles when operating according to the first RAT; operating the first radio in accordance with the second RAT, the first radio having a greater frequency of sleep and wake-up cycles when operating in accordance with the second RAT; wherein the first radio uses a first clock for each of the first RAT and the second RAT, the first clock being operated based on an oscillator in the UE; when the radio is operating according to the first RAT, after a plurality of cycles of sleep and wake-up for the first RAT, performing a frequency error estimation (FEE) of the first clock and adjusting the first clock based on the FEE, wherein performing the FEE and adjusting the first clock while operating according to the first RAT is operated to reduce a frequency of the radio performing FEE and adjusting the first clock while operating according to the second RAT.
22. 22. The method of paragraph 21, further comprising: operating a second RAT FEE timer that when expired indicates that a FEE and clock adjustment should be performed, the second RAT FEE timer upon executing the FEE of the first clock for the first RAT is reset.
23. 23. The method of paragraph 22, further comprising: wherein if the first RAT is in a sleep portion of its sleep and wake-up cycles upon expiration of the second RAT FEE timer, executing a FEE of the first clock in response to the first RAT is in a sleep portion of its sleep and wake-up cycles at the expiration of the second RAT FEE timer.
24. 24. The method of any one of paragraphs 21-23, further comprising: using the FEE of the first RAT to set the first clock for the second RAT.
25. 25. The method of any one of paragraphs 21-24, wherein the first radio uses the first clock for the first RAT during sleep cycles associated with the first RAT and for the second RAT during sleep cycles associated with the second RAT are associated.
26. 26. The method of any one of paragraphs 21-25, wherein the UE has only one A radio for performing cellular communications, wherein the first radio is the only radio.
27. 27. The method of any one of paragraphs 21-26, wherein the UE comprises two smart cards, each configured to implement SIM (Subscriber Identity Module) functionality, wherein the UE is configured to implement DSDA (Dual SIM Dual Active) - implement functionality using the first radio.
28. 28. The method of any one of paragraphs 21-27, wherein the first RAT comprises Long Term Evolution (LTE).
29. 29. The method of any one of paragraphs 21-28, wherein the second RAT comprises Global System for Mobile Communications (GSM).
30. 30. The method of any one of paragraphs 21-29, wherein the oscillator comprises a crystal oscillator.
31. A user equipment device (UE) configured to perform selective neighborhood cell measurement, comprising: an oscillator; a first radio coupled to the oscillator, the first radio configured to communicate using a first radio access technology (RAT) and a second RAT and to maintain a connection with both the first RAT and the second RAT, and wherein the first radio uses the oscillator for both the first RAT and the second RAT; and one or more processors coupled to the first radio, the one or more processors and the first radio configured to: configure the first radio using first software associated with the first RAT; setting up the first radio using second software associated with the second RAT, the first software operating the first radio with a lower frequency of sleep and wake-up cycles for the first RAT than the second software operates the first radio operates for the second RAT; when the radio is set up using the first software and operating in accordance with the first RAT, the first software performs a frequency error estimation (FEE) on the first clock based on the oscillator and adjusts the first clock based on the FEE, wherein the first software operates the FEE to reduce a frequency of the second software performing a FEE.
32. 32. The UE of paragraph 31, wherein the first radio uses the first clock for both the first RAT and the second RAT, wherein performing the FEE includes adjusting the first clock.
33. 33. The UE of any of paragraphs 31-32, wherein the first radio uses the first clock during sleep cycles associated with the first RAT, and wherein the first radio uses the first clock during sleep cycles associated with the second RAT are associated.
34. 34. The UE of any one of paragraphs 31-33, wherein the second software is configured to operate a second RAT FEE timer that when expired indicates that a FEE should be performed, the second RAT FEE timer when performed the FEE of the first clock for the first RAT is reset.
35. 35. The UE of paragraph 34, wherein if the first RAT is in a sleep portion of its sleep and wake-up cycles upon expiration of the second RAT FEE timer, the second software is operable to execute a FEE in response that the first RAT is in a sleep portion of its sleep and wake-up cycles upon expiry of the second RAT FEE timer.
36. 36. The UE of any of paragraphs 31-35, wherein the second software is configured to use results from the FEE to set a clock for the second RAT.
37. 37. The UE of any one of paragraphs 31-36, wherein the UE comprises only a single radio for performing cellular communication, the first radio being the single radio.
38. 38. The UE of any one of paragraphs 31-37, wherein the UE comprises two smart cards, each configured to implement SIM (Subscriber Identity Module) functionality, wherein the UE is configured to implement DSDA (Dual SIM Dual Active) - implement functionality using the first radio.
39. 39. The UE of any one of paragraphs 31-38, wherein the first RAT comprises Long Term Evolution (LTE), and wherein the second RAT comprises Global System for Mobile Communications (GSM).
40. 40. A non-transitory, computer-accessible storage medium for storing program instructions for performing a selective measurement by a user equipment device (UE), the UE including a first radio for communicating using comprising a first radio access technology (RAT) and a second RAT, the program instructions being executable by a processor to: operate the first radio of the UE in accordance with the first RAT; operating the first radio in accordance with the second RAT, the first radio having a lower frequency of sleep and wake-up cycles when operating in accordance with the first RAT than in operating in accordance with the second RAT, the first radio having a first clock for each of the first RAT and the second RAT used; when the radio is operating in accordance with the first RAT, performing a frequency error estimation (FEE) of the first clock and adjusting the first clock based on the FEE, wherein performing the FEE and adjusting the first clock when operating in accordance with the first RAT is operated to reducing a frequency of the radio performing FEE and adjusting the first clock when operating according to the second RAT.
41. 41. A method of operating a UE device, the method comprising: on a UE device comprising a first radio that simultaneously supports a first radio access technology (RAT) and a second RAT: performing, by the UE, a transmission according to the first RAT on the first radio with a base station; receiving a request to perform a path adjustment to detect a synchronization beacon on the second RAT, the synchronization beacon recurring in successive first time periods; repeatedly performing a search for the synchronization beacon in different subsections over successive first time periods; wherein the search is repeatedly performed until the synchronization beacon is located in a respective sub-section of one of the successive time periods.
42. 42. The method of claim 41, wherein the repeated execution causes the LTE base station to observe multiple quick fading instances over the first time period, resulting in a lower mean block error rate (BLER).
43. 43. A method of operating a UE device, the method comprising: on a UE device that comprises at least one transmit/receive chain and that simultaneously supports LTE data transmission and GSM transmission: executing by the UE, of LTE - transmission on the at least one transmission/reception chain with an LTE base station; receiving a request to perform GSM path setup to search for a GSM cell; performing a plurality of GSM path setup operations distributed over a first time period, each of the plurality of GSM path setup operations being shorter than a standard GSM path setup operation, the first time period being longer than the standard GSM path setup operation; wherein performing the plurality of GSM path setting operations causes the LTE base station to observe multiple quick fading instances over the first time period, resulting in a low mean block error rate (BLER).
44. 44. A method of operating user equipment (UE), the method comprising: operating a first radio of the UE according to a first radio access technology (RAT), the first radio having a lower frequency of sleep and wake-up cycles when operating according to the first RAT comprises; operating the first radio in accordance with a second RAT, the first radio having a greater frequency of sleep and wake-up cycles when operating in accordance with the second RAT; wherein the first radio uses a first clock for each of the first RAT and the second RAT, the first clock being operated based on an oscillator in the UE; when the radio is operating according to the first RAT, after a plurality of cycles of sleep and wake-up, performing a frequency error estimation (FEE) of the first clock signal and adjusting the first clock based on the frequency error estimation; wherein the radio operating in accordance with the first RAT performing the FEE and adjusting the first clock is operable to reduce a frequency of the radio performing frequency error estimation and adjusting the first clock in operating in accordance with the second RAT .
45. 45. The method of paragraph 44, wherein the UE operates a second RAT FEE timer that when expired indicates that frequency error estimation and clock adjustment should be performed by software that sets up the first radio according to the second RAT; wherein if software that sets up the first radio according to the first RAT is in a sleep portion of the cycle and upon expiry of the second RAT FEE timer, the second RAT FEE is performed.
46. 46. A method of operating user equipment (UE), the method comprising: deploying a first radio of the UE with first software according to a first radio access technology (RAT), the first software having a lower frequency of sleep and wake-up cycles having; Setting up the first radio with second soft ware according to a second RAT, the second software having a greater frequency of sleep and wake-up cycles; wherein the first radio uses a first clock for each of the first RAT and the second RAT, the first clock being operated based on an oscillator in the UE; when the radio is set up according to the first software and operated according to the first RAT, after a plurality of cycles of sleep and wake-up, the first software performs a frequency error estimation (FEE) of the first clock signal and adjusts the first clock based on the frequency error estimation ; wherein the first software that performs the frequency error estimation and adjusts the first clock operates to reduce a frequency of the second software that performs a frequency error estimation and adjusts the first clock when the radio operates according to the second RAT.
47. 47. The method of any of the preceding claims, wherein the UE comprises two smart cards each implementing SIM (Subscriber Identity Module) functionality; where the UE implements DSDA (Dual SIM Dual Active) functionality.
48. 48. A method, including any act or combination of acts substantially as described in the detailed description herein.
49. 49. Methods substantially as herein with respect to any or any combination of 1 until 8th or described with respect to each or combination of paragraphs in the detailed description.
50. 50. A wireless device configured to perform any act or combination of acts substantially as described in the detailed description herein.
51. 51. Wireless device, including any component or combination of components described in the detailed description herein, as included in a wireless device.
52. 52. A non-transitory computer-readable medium storing instructions that, when executed, cause the performance of any act or combination of acts substantially as described in the detailed description herein.
53. 53. An integrated circuit configured to perform any act or combination of acts substantially as described in the detailed description herein.

Embodiments of the present invention can be embodied in various forms. For example, in some embodiments, the present invention may be embodied as a computer-implemented method, a computer-readable storage medium, or a computer system. In other embodiments, the present invention may be implemented using one or more custom hardware devices such as an ASIC. In other embodiments, the present invention may be implemented using one or more programmable hardware elements, such as an FPGA.

In some embodiments, a non-transitory, computer-readable storage medium may be adapted to store program instructions and/or data, the program instructions, when executed by a computer system, causing the computer system to perform a method, such as any of those described herein method embodiments, or any combination of the method embodiments described herein, or any subset of any of the method embodiments described herein, or any combination of such subsets.

In certain embodiments, a device (e.g., a UE) may be configured to include a processor (or a set of processors) and a storage medium, the storage medium storing program instructions, the processor being configured to read the program instructions from the read and execute a storage medium, the program instructions being executable to implement any of the various method embodiments described herein (or a combination of the method embodiments described herein, or a subset of any of the method embodiments described herein, or a combination of such subsets). The device can be implemented in various forms.

Although the above embodiments have been described in considerable detail, many variations and modifications will become apparent to those skilled in the art once the above disclosure is fully understood. It is intended that the following claims be construed as covering all such variations and modifications.

Claims (12)

A method of operating a UE device, the method comprising: at a user equipment device (UE) comprising a first radio, the first radio being configurable to operate according to a first radio access technology (RAT) and a second RAT: performing communication according to the first RAT on the first radio with a base station; receiving a request to perform a path adjustment to detect a synchronization beacon on the second RAT, the synchronization beacon recurring in successive first time periods; in response to the request, repeatedly performing a search for the synchronization beacon in different sub-sections of the first time period over successive first time periods, the sub-sections each comprising one or more frames of the second RAT, the search being repeatedly performed until the synchronization beacon in a respective subsection of one of the successive time periods is located. procedure after claim 1 , further comprising: determining a channel quality of the second RAT; and comparing the channel quality to a threshold; wherein repeatedly performing the search for the synchronization beacon is performed based on comparing the channel quality to the threshold. procedure after claim 2 , at which the threshold is between 80 and 100 dBm. procedure after claim 2 wherein determining the channel quality comprises determining a received signal strength indicator (RSSI) of the second RAT. procedure after claim 2 wherein if the channel quality is less than the threshold, the method comprises: performing a search for the synchronization beacon in a single first time period; wherein repeatedly performing the search for the synchronization beacon in different sub-parts of the first time period over successive first time periods is performed in addition to searching for the synchronization beacon in the single first time period. procedure after claim 5 wherein if the channel quality is above the threshold then performing the search repeatedly is performed instead of performing the search for the synchronization beacon in a single first time period. procedure after claim 1 wherein repeatedly performing the search comprises: sampling a first sub-portion of the first time period in a first successive time period; performing the detection of the synchronization beacon of the first sub-portion of the first time period in the first successive time period; and concurrently with performing the detection of the synchronization beacon, sampling a second sub-portion of the first time period in a second successive first time period. procedure after claim 1 , wherein repeatedly executing the first RAT causes a base station to observe multiple quick fading instances for the UE over the first time period. procedure after claim 1 , in which the first RAT includes Long Term Evolution (LTE), and in which the second RAT includes Global System for Mobile Communications (GSM). procedure after claim 1 wherein the synchronization beacon comprises a burst on a frequency correction channel (FCCH) of the second RAT. User equipment device (UE) configured to implement the method according to any one of Claims 1 - 10 to execute. Computer program that is set up to carry out the method according to one of Claims 1 - 10 to execute.

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