Patent Description:
Wireless communication devices may be referred to as mobile telephones, user equipments (UE), wireless terminals, mobile terminals, mobile stations, cellular telephones, smart phones, laptops, tablets and phablets, i.e. a combination of a smartphone and a tablet with wireless capability. Wireless communication devices are enabled to communicate or operate wirelessly in a wireless communication system comprising multiple networks or Heterogeneous Networks (HetNet) with access nodes or access points. The heterogeneous networks may comprise, e.g. a cellular communications network comprising Second /Third Generation (<NUM>/<NUM>) network, such as Global System for Mobile Communications (GSM), Wideband Code Division Multiple Access (WCDMA) or High Speed Packet Access (HSPA) etc., <NUM> Long Term Evolution (LTE) network, Worldwide interoperability for Microwave Access (WiMAX) network, Wireless Local Area Network (WLAN) or WiFi etc. for proving different type of radio access technologies (RATs). A wireless communications network may cover a geographical area which is divided into cells or cover areas, wherein each cell is served by a network node, which may also be referred to as a serving network node, an access node, an access point or a base station, e.g. eNodeB (eNB) or NodeB.

The development of new generations of cellular systems simultaneously with upgrading existing generations allows for a wider range of accessible networks and RATs. In an environment where e.g., both LTE and HSPA co-exist, data rates for the two RATs are comparable. Furthermore, both LTE and HSPA allow for multi carrier signalling. In LTE this capability is denoted as Carrier Aggregation (CA), allowing for up to five LTE carriers to be aggregated, whereas in HSPA it is denoted as Multi Carrier (MC), allowing for up to eight HSPA carriers to be aggregated.

Further, specifications for the Evolved Packet System (EPS), also called a Fourth Generation (<NUM>) network, have been completed within the <NUM>rd Generation Partnership Project (3GPP) and this work continues in the coming 3GPP releases, for example to specify a Fifth Generation (<NUM>) network. This will provide more accessible networks and RATs.

An arising scenario today is multiple Subscriber Identity Modules (SIMs) devices, such as UEs may carry two or more SIMs from a single or multiple operators in the same device. Particularly in Asia this has become de facto standard, although it has not been standardized by the 3rd Generation Partnership Project (3GPP). On many markets it is hard to get operator approval and volumes for a mid-end device without the capability of supporting at minimum Dual SIM Dual Standby (DSDS). The capability of supporting DSDS allows a UE to camp on two cells simultaneously, or be connected to one cell and camp on another cell. In case both SIMs are from the same operator, the UE may occasionally camp on the same cell but with two different identities and associated paging occasions. In order to qualify for high-end device approval, it is generally required to support Dual SIM Dual Activity (DSDA), whereby the UE can be independently connected towards two cells simultaneously.

The popularity of DSDS/DSDA devices on Asian markets depends on several factors. One factor may be that operators have different price plans e.g. for data and voice, or may have different price plans depending on calling subscribers in same or other network. Other factors may be, e.g. different coverage by different operators, i.e. spotty coverage, or that a mobile phone number cannot move between operators. The trend is towards to support even more than two SIMs simultaneously, and UEs with support for three and four SIMs, Triple SIM, Triple Standby (TSTS) and Quad SIM Quad Standby (QSQS) have been announced by some UE vendors.

For DSDA UEs in active mode, it is required for the UE to use separate receivers for each connection, since it e.g. may use a Packet Switched (PS) service simultaneously for both SIMs, or may use PS service for one and a Circuit Switched (CS) service for the other. Therefore to support DSDS/DSDA, TSTS/QSQS and different RATs, the wireless communication devices usually comprise multiple receiving paths.

Moreover multi-antenna UEs have been introduced in LTE network. Although not explicitly stated, requirements that were defined for Evolved Universal Terrestrial Radio Access (E-UTRA) in the 3GPP LTE specification Release <NUM> were impossible to pass without two antennas. In parallel, UEs with dual antennas were introduced also in the previous generation of cellular systems, such as in WCDMA.

3GPP's Radio Access Network Working Group <NUM> (RAN <NUM>) is responsible for defining the requirements for transmission and reception parameters, channel demodulation and radio resource management. Although the functionality of up to eight Multi-input Multi-output (MIMO) streams has been specified in 3GPP RAN <NUM> since Release <NUM>, it is not until the ongoing Release <NUM> that the work on the requirements specification was instigated for up to <NUM> MIMO streams.

Four downlink receive antennas (DL <NUM> RX) increases the spatial diversity allowing for more parallel streams to be transmitted when conditions allow, or for the UE to being able to cancel out interferers while receiving data allowing for higher modulation orders or code rates although not necessarily using more parallel layers. All in all this will result in significantly higher data rates compared to a standard DL <NUM> RX UE. Future UEs may very well be equipped with even more antennas, in particular considering the increased carrier frequencies that are being introduced in future standards, allowing for smaller but more antennas on the same space.

MIMO allows multiple layers to be transmitted in parallel streams over the same physical time-frequency resource. The number of parallel streams are, however, limited to the lesser number of the number of transmit antennas and the number of receive antennas. Quite often, in practice the number of streams is even less than that. The actual value depending on several factors such as radio propagation environment, as well as the antenna design of both the eNB and the UE.

For improving the performance of wireless communication devices with multiple SIMs and multiple antennas and receiving paths, it is desirable to handle the operating modes and schedule the connections of the multiple SIMs to the networks. One of present solutions for scheduling between multiple SIMs in e.g. a dual-SIM UE, is to share the existing RX chains or paths. However, the receiving paths are typically a limiting resource in the sense that full functionality with multiple antennas for several connected SIMs at the same time is typically not possible. Hence in case both SIMs request high activity connection, a control unit in the wireless communication device needs to prioritize the limited resources. In some prior art solutions one of the SIMs have a hard coded priority, while in other prior art approaches a random SIM is getting prioritized. These priority methods may be not optimum for some use case scenarios where one of the SIMs may have higher priority than other SIMs, and therefore may cause problems for the SIM which is not prioritized and its connection may be interrupted undesirably.

<CIT> discloses an apparatus configured to establish a first call for a first subscription, and accept a second call for a second subscription while maintaining the first call. A single transmit chain may be used to transmit uplink traffic associated with the first call and uplink traffic associated with the second call.

A timesharing schedule for the transmit chain may determine when the uplink traffic associated with the first call is transmitted and when the uplink traffic associated with the second call is transmitted on the transmit chain.

<CIT> discloses various user interfaces and other technologies for interacting with devices that support multiple SIM cards can be implemented in order to deal with multiple SIM card scenarios.

<CIT> discloses a method for facilitating call back from a communication device with multiple subscriber identities comprising at least a first subscriber identity and a second subscriber identity. The method comprises receiving a telephone call on a first subscription associated with the first subscriber identity from another communication device. The method also comprises determining an order of prioritization among the subscriber identities according to at least one parameter for establishing the telephone call with the other communication device on the subscription associated with the respective subscriber identities. The method further comprises facilitating call back to the other communication device using the second subscriber identity when it is determined that the second subscriber identity is more prioritized than the first subscriber identity.

<CIT> discloses a SIM selection method of a wireless communication device connectable to a first SIM associated with a first subscription in relation to a first wireless communication system and a second SIM associated with a second subscription in relation to a second wireless communication system. The method comprises obtaining current values of first second and third parameters. The first parameters are applicable in relation to the first SIM and in relation to the second SIM, and comprise a geographical location of the wireless communication device. The second and third parameters obtained for the first SIM are applicable in relation to the first SIM only and the second and third parameters obtained for the second SIM are applicable in relation to the second SIM only. The current values of the third parameters are based on values of the third parameters associated with the geographical location and uploaded to a server by a plurality of other wireless communication devices. The method also comprises receiving a SIM utilization request from an application of the wireless communication device and selecting one of the first SIM and the second SIM for utilization by the application based on the current values of the first parameters, the second parameters, and the third parameters.

It is therefore an object of embodiments herein to provide an improved prioritization method and connection management for a wireless communication device with multiple SIMs and multiple receiving paths in a wireless communication system.

According to a first aspect of embodiments herein, the object is achieved by a method performed in a wireless communication device for managing connection states in a wireless communication system. The wireless communication device comprises at least two Subscriber Identity Modules, SIMs, in which a first SIM is associated to a first original connection state towards a first network node, a second SIM is associated to a second original connection state towards a second network node. The wireless communication device first obtains a position of the wireless communication device. Then the wireless communication device determines a priority list for the at least two SIMs based on the obtained position. The wireless communication device further determines whether the respective connection states of the first and second SIMs have conflicting needs in radio resources. When the respective connection states of the first and second SIMs have conflicting needs in radio resources, the wireless communication device performs a connection state change for the SIM that has lower priority from its original connection state to a third connection state.

According to a second aspect of embodiments herein, the object is achieved by a wireless communication device for managing connection states in a wireless communication system. The wireless communication device comprises at least two Subscriber Identity Modules, SIMs, in which a first SIM is associated to a first original connection state towards a first network node, a second SIM is associated to a second original connection state towards a second network node. The wireless communication device is configured to obtain a position of the wireless communication device. The wireless communication device is further configured to determine a priority list for the at least two SIMs based on the obtained position. The wireless communication device is further configured to determine whether the respective connection states of the first and second SIMs have conflicting needs in radio resources. When the respective connection states of the first and second SIMs have conflicting needs in radio resources, the wireless communication device is configured to perform a connection state change for the SIM that has lower priority from its original connection state to a third connection state.

According to the embodiments herein, the prioritization of SIMs is made based on the position of the wireless communication device in case two or all SIMs request the limited radio resources at the same time. The position may be in time and/or space, so the SIM has a natural priority, e.g. a SIM with an office subscription is at office during office hours, or a SIM with a private subscription during non-office hours, may get the highest priority. Then the connection states s of the SIMs are managed based on the determined priority. The connection state associated to non-prioritized SIMs may be forced to change to a third sate, e.g. a lower active state, idle state or detached state etc.. In this way, an automatic prioritization of SIMs based on time and/or localization of the wireless communication device is achieved. This improves user experience with less need of manual parameter settings or priority list settings.

Therefore, the embodiments herein provide an improved wireless communication device and method therein for prioritizing and managing connections and operations for all supported SIMs and an optimized management of radio resources in the wireless communication device.

Examples of embodiments will be described in more detail with reference to attached drawings in which:.

The claimed invention corresponds to <FIG> and to the related text in the description. The remaining figures and the text of the description are intended to better explain the invention. <FIG> depicts an example of a wireless communication system <NUM> in which embodiments herein may be implemented. The wireless communication system <NUM> may comprise one or more wireless communication networks such as e.g. any <NUM>, <NUM>, <NUM> or LTE, <NUM> networks, Wimax, WLAN or WiFi , Bluetooth, sensor networks etc. for providing different RATs.

Each wireless communication network may cover a geographical area which is divided into cells or coverage areas. Each cell area is served by a network node operating in the respective wireless communication network. One network node may serve several cells. In <FIG>, three network nodes are shown, network node <NUM>, network node <NUM>, and network node <NUM>. The term network node as used herein may also be referred to as a serving network node, an access node, an access point or a base station. Therefore the wireless communication system <NUM> may comprise a number of network nodes serving cells with RATs which may be different, and support communications for a number of wireless communication devices located therein. The network node <NUM> serves a cell <NUM> and provides a first RAT, RAT1, the network node <NUM> serves a cell <NUM> and provides a second RAT, RAT2, and the network node <NUM> serves a cell <NUM> and provides a third RAT, RAT3. The RAT1, RAT2 and RAT3 may be same or different RATs, e.g. LTE, WCDMA/HSPA, GSM or Enhanced Data GSM Evolution (EDGE) etc..

A number of wireless communication devices operate in the wireless communication system <NUM>, whereof one, a wireless communication device <NUM>, is shown in <FIG>.

The wireless communication device <NUM> may be, e.g. a mobile terminal or station, a wireless terminal, a user equipment, a mobile phone, a computer such as e.g. a laptop, a Personal Digital Assistants (PDAs) or a tablet computer etc. The wireless communication device <NUM> comprises at least two SIMs, whereof the wireless communication device <NUM> shown in <FIG> comprises SIM1, SIM2, SIM3. The at least two SIMs may belong to different operators, e.g. which may provide different subscriptions, or provide different RATs or use different spectrum, i.e. different carrier frequencies, in different coverage areas or cells, e.g. in cities or countryside. Further, the service subscriptions of the two or more SIMs may differ, such as one SIM may provide an all-exclusive service whereas the other may provide only fundamental past generation service. The at least two SIMs may also associate to different subscriptions, e.g. an office or job subscription, a private subscription etc..

The wireless communication device <NUM> comprises multiple radio receiving paths, whereof the wireless communication device <NUM> shown in <FIG> comprises e.g. four radio receiving paths RX1, RX2, RX3, RX4. A radio receiving path converts received RF signals to baseband signals, and it may comprise e.g. band selective filters, low noise amplifier, mixer, analog to digital converter etc. The wireless communication device <NUM> may have multiple antennas and capability of MIMO. The multiple radio receiving paths may have its own antenna.

In order to optimally utilize the spectrum, the wireless communication device <NUM> reports Channel State Information (CSI) to the network node <NUM>, <NUM>, <NUM> and the network node <NUM>, <NUM>, <NUM> will base subsequent transmissions on the reported CSI. CSI typically includes a channel quality indicator (CQI) representing certain setups of the modulation and coding scheme (MCS), a precoding matrix indicator (PMI) representing the preferred precoding matrix, and a rank indicator (RI) representing the number of parallel spatial streams that the wireless communication device <NUM> can resolve. CQI and PMI may be conditioned on a certain rank. Further CQI and RI may be adjusted to a higher value in order to influence link adaption to increase data rates faster following an interrupt.

Example embodiments of a method performed in the wireless communication device <NUM> for managing connection states in the wireless communication system <NUM> will now be described with reference to <FIG>. The wireless communication device <NUM> comprises multiple receiving paths or branches RX1, RX2, RX3, RX4 and at least two SIMs, a first and second SIM SIM1 and SIM2. The first SIM is associated to a first original connection state towards the first network node <NUM>. The second SIM is associated to a second original connection state towards the second network node <NUM>. The respective SIM may be associated to different subscriptions, for example one SIM may be associated with an office or job subscription and another SIM may be associated with a private subscription. Some SIMs may have subscriptions associated to the same operator or to different operators. For example, the first network node <NUM> may be same as the second network node <NUM>. According to the embodiments herein, the method comprises the following actions, which actions may be taken in any suitable order.

In order to prioritize and manage connection states of the multiple SIMs and improve the performance of the wireless communication device <NUM> for the respective SIMs based on its localization and time, the wireless communication device <NUM> needs to obtain a position of the wireless communication device <NUM>. The wireless communication device <NUM> obtains at regular basis its position. The position may be a position in space, i.e. a geographical localization or position. The position may be a position in time, e.g. day time, office hours, weekend, during night etc. In some embodiments it may be both in time and space, e.g. at office during day time, at home outside office hours etc. The wireless communication device <NUM> may obtain its position based on a geographical position determined, for instance by Global Navigation Satellite System (GNSS), Global Position System (GPS), cellular/wireless Network assisted -GPS, i.e. A-GPS or by sensor networks. In other embodiments, the wireless communication device <NUM> may obtain its position based on a geographical position determined by a proximity detection by a proximity sensor, where the proximity here is a detection of certain beacons or sync signals transmitted from specific access points (AP) via low power wireless communication system, like Bluetooth low energy or WLAN.

The wireless communication device <NUM> may also obtain its position in space based on a position of its serving network node in a cellular network of the wireless communication system <NUM>, or based on a position derived from triangulation using several network nodes.

Once the position is obtained, the wireless communication device <NUM> determines a priority list for the at least two SIMs based on the obtained position. The priority list may be determined beforehand and stored as a look-up table in the wireless communication device <NUM>. In other embodiments, the priority list may be stored in a cloud and an over-the-top application may report the position, using one of the SIM connection, to a server in the cloud and the server reports to the wireless communication device <NUM> the priority of SIMs at the current position.

Typical examples of SIM prioritizations, depending on a type of subscription in combination with the localization and time, may be at least one or a combination of:.

These are some examples of use case scenarios where one of the SIMs has a natural prioritization. Some other rules may be used when the wireless communication device <NUM> determines a priority list for the at least two SIMs based on the obtained position.

In order to manage connection states of the SIMs and to know if prioritization is needed, the wireless communication device <NUM> determines whether the respective connection states of the first and second SIMs have conflicting needs in radio resources. This may be done by a control unit in the wireless communication device <NUM> which continuously monitors the radio resource need for the connections associated to the respective SIMs in order to see whether there is a risk for radio resource conflicts. The radio resources may comprise receiver branches or paths, digital processing units or dedicated hardware blocks, e.g. hardware accelerators, decoders or Fast Fourier transforms (FFTs). They are limited radio resources in the wireless communication device <NUM>. For example, a number of receiving paths needed for a connection state associated with a SIM is determined based on the type of the connection, the RAT and radio link conditions associated with the SIM towards its network node.

When the respective connection states of the first and second SIMs have conflicting needs in radio resources, for example, both SIMs are in active mode and request full use of RX branches RX1, RX2, RX3, RX4 and hence a total of <NUM> RX is requested while only <NUM> RX exists, prioritization is needed and one of the SIM has to change its connection state. The wireless communication device <NUM> performs a connection state change for the SIM that has lower priority from its original connection state to a third connection state.

A connection state change may be any one of:.

Further, a third connection state may be any one of:.

The connection state change may be triggered by transmitting a request to the serving node of the SIM that has lower priority or triggered by the wireless communication device <NUM>. In the case where the connection state of the SIM that has lower priority is changed from idle mode to a detached state, the wireless communication device <NUM> informs the corresponding network node that it is going to turn off the connection prior to actual detach.

According to some embodiments herein, the connection state change may be a change of RAT. In case the the wireless communication device <NUM> has detected other RATs on other carrier frequencies, e.g. detected via well-known Inter RAT (IRAT) measurements or by autonomous search. The wireless communication device <NUM> may choose one of the detected RATs which uses less radio resources, and the connection for the SIM that has lower priority may be changed to use this RAT.

According to some embodiments herein, more than one SIMs may be selected to perform a connection state change according to the priority list for the SIMs. For example, if <NUM> SIMs are in a connection state at the same time, and a state change for one of the SIM is not enough to release necessary radio resources for the SIM has the highest priority, another SIM which has lower priority may be selected to perform a state change to release more radio resources.

The wireless communication device <NUM> may report a connection state change of the connection associated with the SIM to its associated network node. This may be done by a CSI report. For example, SIM1 is performing CSI reporting at regular intervals to the first network node <NUM>. The CSI may include RANK information with the maximum reported rank conditioned on the number of allocated RX paths to SIM1. It may be assumed that a full rank reporting is performed, i.e., requiring all <NUM> RX paths when it is in the original connection state. After a state change, the wireless communication device <NUM> starts to report CSI based on only two RX paths instead of four for SIM1. For example a maximum RANK of <NUM>, i.e. only <NUM> MIMO layers can be transmitted on the connection associated with SIM1. This is in order for the network node <NUM> not to allocate number of MIMO layers more than what the wireless communication device <NUM> can handle for SIM1. In order for the connection state change to be performed in a secure manner, a Radio Resource Control (RRC) signaling to the network node associated to the SIM may be performed.

To summarize, the method according to embodiments herein provides an improved prioritization and connection management for a wireless communication device <NUM> with multiple SIMs. A prioritization is made for the multiple SIMs based on the position of the wireless communication device <NUM> when connections associated with the respective SIMs require limited radio resources at the same time. The connections associated to non-prioritized SIMs may be forced to a lower active state, idle state, detached state or a dormant state. A restricted set of RX branches including antennas may be allocated to the connection associated to the non-prioritized SIMs. The position may be time, localization or both time and localization. In this way, it allows for automatic prioritization of the multiple SIMs based on time and localization of the wireless communication device <NUM>. Further the SIM which has a natural priority, e.g. a SIM with an office subscription at office during office hours, or a SIM with a private subscription during non-office hours, may get the highest priority. This will improve user experience with less undesired interruptions, less missed important messages or calls, less need of manual parameter settings or priority list settings. Further, this also provides an optimized management of radio resources in the wireless communication device <NUM>.

To perform the method actions in the wireless communication device <NUM> for managing connection states in the wireless communication system <NUM> as described above in relation to <FIG>, the wireless communication device <NUM> comprises the following circuits, units or modules depicted in <FIG>. As mentioned above, the wireless communication system <NUM> comprises any one or more <NUM>, <NUM>, <NUM> or LTE, <NUM> networks, Wimax, WLAN or WiFi, Bluetooth, sensor networks etc. The wireless communication device <NUM> comprises multiple receiving paths and at least two Subscriber Identity Modules, SIMs. The first SIM1 is associated to a first original connection state towards the first network node <NUM>. The second SIM2 is associated to a second original connection state towards the second network node <NUM>.

The wireless communication device <NUM> may comprise, e.g. a control unit <NUM>, a determining unit <NUM>, a RF unit <NUM>, a SIM1 manager unit <NUM>, a SIM2 manager unit <NUM>, etc. The RF unit <NUM> may represent any radio resources or radio interfaces, e.g. radio receivers or transmitters etc. for receiving and transmitting radio signals from/to network nodes. The RF unit <NUM> comprises multiple receiving paths RX1, RX2, RX3, RX4 as shown in <FIG>.

According to the embodiments herein, the communication device <NUM> is configured to, e.g. by means of the control unit <NUM> being configured to, obtain a position of the wireless communication device <NUM>.

The communication device <NUM> is further configured to, e.g. by means of the determining unit <NUM> being configured to, determine a priority list for the at least two SIMs based on the obtained position. The communication device <NUM> is further configured to determine whether the respective connection states of the first and second SIMs have conflicting needs in radio resources. When the respective connection states of the first and second SIMs have conflicting needs in radio resources, the communication device <NUM> is configured to, e.g. by means of the SIM1 manager unit <NUM> or the SIM2 manager unit <NUM> being configured to, perform a connection state change for the SIM that has lower priority from its original connection state to a third connection state.

According to some embodiments herein, the wireless communication device <NUM> may be configured to obtain a position based on any one of a GNSS position, a proximity detected by a proximity sensor, a position of a serving network node in a cellular network of the wireless communication system <NUM>, or a position derived from triangulation using several network nodes.

According to some embodiments herein, the wireless communication device <NUM> may be configured to, e.g. by means of the control unit <NUM> being configured to, perform a connection state change for more than one SIMs according to the priority list for the SIMs.

According to some embodiments herein, the wireless communication device <NUM> may be configured to, e.g. by means of the control unit <NUM> being configured to, report the connection state change of the connection associated with the SIM to its associated network node.

Those skilled in the art will appreciate that the control unit <NUM>, the determining unit <NUM>, the SIM1 manager unit <NUM> and SIM2 manager unit <NUM> described above may be referred to one unit, a combination of analog and digital circuits, one or more processors, such as processor <NUM>, depicted in <FIG>, configured with software and/or firmware and/or any other digital hardware performing the function of each unit. One or more of these processors, the combination of analog and digital circuits as well as the other digital hardware, may be included in a single application-specific integrated circuitry (ASIC), or several processors and various analog/digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a-chip (SoC).

The wireless communication device <NUM> may further comprise a memory <NUM> comprising one or more memory units. The memory <NUM> is arranged to be used to store information, e.g. the priority list, CSI, CQI, RI and data, as well as configurations to perform the methods herein when being executed in the communication device <NUM>.

The embodiments herein in the wireless communication device <NUM> for managing connection states in the wireless communication system <NUM>, may be implemented through one or more processors, such as the processor <NUM> in the wireless communication device <NUM> together with computer program code <NUM> for performing the functions and actions of the embodiments herein. The program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier <NUM> carrying computer program code <NUM> for performing the embodiments herein when being loaded into the wireless communication device <NUM>. One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick. The computer program code may furthermore be provided as pure program code on a server and downloaded to the wireless communication device <NUM>.

When using the word "comprise" or "comprising" it shall be interpreted as nonlimiting, i.e. meaning "consist at least of".

Claim 1:
A method performed in a wireless communication device (<NUM>) for managing connection states in a wireless communication system (<NUM>), wherein the wireless communication device (<NUM>) comprises at least two Subscriber Identity Modules, SIMs, in which a first SIM is associated to a connection state towards a first network node (<NUM>), a second SIM is associated to a connection state towards a second network node (<NUM>), the method being characterized in comprising:
obtaining (<NUM>) a position of the wireless communication device (<NUM>);
determining (<NUM>) a priority for the at least two SIMs based on the obtained position;
determining (<NUM>) whether the connection state of the first SIM and the connection state of the second SIMs have conflicting needs in radio resources; and if so
performing (<NUM>) a connection state change for the SIM of the first SIM and the second SIM that has lower priority from its connection state to a further connection state which needs less resources, wherein in the further connection state the connection is maintained.