Apparatus, method, and computer program

Abstract

An apparatus comprising: means for allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment 5 associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and means for controlling steering, switching or splitting of traffic, using one or more rules associated with the first and / orsecond allocated identities, to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the 10 respective access network.

Description

Technical Field This disclosure relates to methods, apparatus and computer programs and in particular but not exclusively to methods, apparatus and computer program relating to dual steering. Background A communication system can be seen as a facility that enables communication sessions between two or more entities such as communication devices, base stations and / or other nodes by providing carriers between the various entities involved in the communications path. The communication system and associated entities typically operate in accordance with a given standard or specification which sets out what the associated entities are permitted to do and how that should be achieved. Communication protocols and / or parameters that shall be used for the connection are also typically defined. Examples of standard include the so-called 5G standards. Summary Some example embodiments of this disclosure will be described with respect to certain aspects. These aspects are not intended to indicate key or essential features of the various example embodiments of this disclosure, nor are they intended to be used to limit the scope of thereof. Other features, aspects, and elements will be readily apparent to a person skilled in the art in view of this disclosure. According to a first aspect, there is provided an apparatus comprising: means for allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and means for controlling steering, switching or splitting of traffic, using one or more rules associated with the first and / or second allocated identities, to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network. The apparatus may comprise the first user equipment and the second user equipment. The first user equipment may be configured to transmit traffic provided to the first user equipment via the first access network and the second user equipment maybe configured to transmit traffic steered to the second user equipment via the second access network. The apparatus may comprise means for receiving the one or more rules associated with one or more of the first and / or second allocated identities. The receiving means may be for receiving the rules for one or more of the first and second user equipment via the respective access networks. The one or more rules may comprise one or more of the first and second allocated identities. The means for controlling steering, switching or splitting of traffic may be for using one or more first and second identities to determine to which one or more of the first and second user equipment the traffic is to be provided. The apparatus may comprise means for storing a mapping between first user equipment and the first allocated identifier and a mapping between the second user equipment and the second allocated identifier. The first network access may comprise a first 3GPP access and the second network access may comprise a second 3GPP access. The first and second subscriber identities may be associated with a common subscriber profile. The first subscriber identity may be a first subscription permanent identifier SUPI and the second subscriber identity may be a second subscription permanent identifier SUPI. The apparatus may be a controller. The apparatus may provide a dual steer control layer. According to a second aspect, there is provided a method comprising: allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and controlling steering, switching or splitting of traffic, using one or more rules associated with the first and / or second allocated identities, to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network. The method may comprise transmitting via the first access network by the first user equipment traffic provided to the first user equipment and transmitting via the second access network by the second user equipment traffic provided to the second user equipment via the second access network. The method may comprise receiving the one or more rules associated with one or more of the first and / or second allocated identities. The method may comprise receiving the rules for one or more of the first and second user equipment via the respective access networks. The one or more rules may comprise one or more of the first and second allocated identities. The method may comprise using one or more first and second identities to determine to which one or more of the first and second user equipment the traffic is to be provided. The method may comprise storing a mapping between first user equipment and the first allocated identifier and a mapping between the second user equipment and the second allocated identifier. The first network access may comprise a first 3GPP access and the second network access may comprise a second 3GPP access. The first and second subscriber identities may be associated with a common subscriber profile. The first subscriber identity may be a first subscription permanent identifier SUPI and the second subscriber identity may be a second subscription permanent identifier SUPI. The apparatus may comprise the first user equipment and the second user equipment. The method may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the second aspect. The apparatus may be a controller. The apparatus may provide a dual steer control layer. The apparatus may comprise or be a first user equipment of the dual steer device, the first user equipment being associated with the first subscription. The apparatus may be the dual steer device and may further comprise a second user equipment, the second user equipment being associated with the second subscription. The apparatus may comprise or be a user equipment of the dual steer device, the first subscription and the second subscription being associated with the user equipment. According to a third aspect, there is provided an apparatus comprising: means for allocating a first identity, said first identity being associated with a first subscriber identity and for allocating a second identity, said second identity being associated with a second subscriber identity; and means for controlling the steering, switching and / or splitting of traffic using one or more rules associated with the first and second identities, the traffic being sent via one or more of a first access network associated with the first subscriber identifier and a second access network associated with the second subscriber identifier. The first subscriber identifier may be associated with a first user equipment and the second subscriber identifier may be associated with a second user equipment. The apparatus may comprise the first user equipment and the second user equipment. The means for controlling the steering, switching or splitting of traffic may be for providing the traffic to one or more of the first user equipment and the second user equipment based on the respective allocated first and / or second identities in the one or more rules. The first subscriber and the second subscriber identifier may be associated with one user equipment. The apparatus may comprise or is the one user equipment. The apparatus may be a controller. The apparatus may provide a dual steer control layer. According to a fourth aspect, there is provided a method comprising: allocating a first identity, said first identity being associated with a first subscriber identity and allocating a second identity, said second identity being associated with a second subscriber identity; and controlling the steering, switching and / or splitting of traffic using one or more rules associated with the first and second identities, the traffic being sent via one or more of a first access network associated with the first subscriber identifier and a second access network associated with the second subscriber identifier. The first subscriber identifier may be associated with a first user equipment and the second subscriber identifier may be associated with a second user equipment. The method may comprise providing the traffic to one or more of the first user equipment and the second user equipment based on the respective allocated first and / or second identities in the one or more rules. The method may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the fourth aspect. The apparatus may be a controller. The apparatus may provide a dual steer control layer. The apparatus may comprise or be a first user equipment of the dual steer device, the first user equipment being associated with the first subscription. The apparatus may be the dual steer device and may further comprise a second user equipment, the second user equipment being associated with the second subscription. The apparatus may comprise or be a user equipment of the dual steer device, the first subscription and the second subscription being associated with the user equipment. According to a fifth aspect, there is provided an apparatus comprising: means for allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and means for receiving from one or more of the first and second user equipment, one or more rules for controlling steering of uplink traffic via one or more of the first and second user equipment identified by first allocated identity or second allocated identity. The apparatus may comprise means for providing the first user equipment with the first allocated identity and the second user equipment with the second allocated identity. The apparatus may comprise the first user equipment and the second user equipment. The first user equipment may be configured to receive one or more of the one or more rules and provide the one or more rules received by the first user equipment, with the first identity, to the means for receiving; and / or the second user equipment may be configured to receive one or more of the one or more rules and provide the one or more rules received by the second user equipment, with the second identity, to the means for receiving. The first user equipment may be configured to receive the one or more rules with a first network allocated identity and a second network allocated identity, and to replace the first network allocated identity with the first identity; and / or the second user equipment may be configured to receive the one or more rules with a first network allocated identity and a second network allocated identity and to replace the second network allocated identity with the second identity. The first and second network allocated identifiers may comprise temporary identifiers. The temporary identifier comprise a 5G globally unique temporary identifier. The first user equipment may be configured to provide to a network, via the first access network, the first allocated identifier, and / or the second user equipment may be configured to provide to the network, via the second access network, the second allocated identifier. The first user equipment may be configured to provide to the network, via the first access network, the first identifier in a registration message or in a packet data unit session establishment request, and / or the second user equipment may be configured to provide to the network, via the second access network, the second identifier in a registration message or in a packet data unit session establishment request. One of the first user equipment and the second user equipment may be configured to receive the one or more rules for controlling the steering of the uplink traffic, the one or more rules defining combined one or more rules for both the first user equipment and the second user equipment, the combined one or more rules including the first allocated identifier and the second allocated identifier. The apparatus may comprise means for controlling steering, switching and / or splitting of uplink traffic, using one or more of the received one or more rules, to one or more of the first and second user equipment is for transmitting of the traffic by the respective user equipment via the respective user access network. The means for controlling steering switching and / or splitting of traffic may be using one or more of the allocated first and second identities to determine to which one or more of the first and second user equipment the traffic is to be steered, switched and / or split. The first user equipment may be configured to transmit traffic steered switched and / or split to the first user equipment via the first access network and the second user equipment may be configured to transmit traffic steered switched and / or split to the second user equipment via the second access network. The apparatus may comprise means for storing a mapping between the first subscriber identity of the first user equipment and the first allocated identifier and a mapping between the second subscriber identity of the second user equipment and the second allocated identifier. The first network access may comprise a first 3GPP access and the second network access may comprise a second 3GPP access. The first and second subscriber identities may be associated with a common subscriber profile. The first subscriber identity may be a first subscription permanent identifier and the second subscriber identity may be a second subscription permanent identifier. According to a sixth aspect, there is provided a method comprising: allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and receiving from one or more of the first and second user equipment, one or more rules for controlling steering of uplink traffic via one or more of the first and second user equipment identified by first allocated identity or second allocated identity. The method may comprise providing the first user equipment with the first allocated identity and the second user equipment with the second allocated identity. The method may comprise receiving by the first user equipment one or more of the one or more rules and providing the one or more rules received by the first user equipment, with the first identity; and / or receiving by the second user equipment one or more of the one or more rules and provide the one or more rules received by the second user equipment, with the second identity. The method may comprise receiving by the first user equipment the one or more rules with a first network allocated identity and a second network allocated identity, and to replace the first network allocated identity with the first identity; and / or receiving by the second user equipment receive the one or more rules with a first network allocated identity and a second network allocated identity and to replace the second network allocated identity with the second identity. The first and second network allocated identifiers may comprise temporary identifiers. The temporary identifier comprise a 5G globally unique temporary identifier. The method may comprise providing by the first user equipment to a network, via the first access network, the first allocated identifier, and / or providing by the second user equipment to the network, via the second access network, the second allocated identifier. The method may comprise providing to the network by the first user equipment, via the first access network, the first identifier in a registration message or in a packet data unit session establishment request, and / or the second user equipment may be configured to provide to the network, via the second access network, the second identifier in a registration message or in a packet data unit session establishment request. The method may comprising receiving by one of the first user equipment and the second user equipment the one or more rules for controlling the steering of the uplink traffic, the one or more rules defining combined one or more rules for both the first user equipment and the second user equipment, the combined one or more rules including the first allocated identifier and the second allocated identifier. The method may comprise controlling steering, switching and / or splitting of uplink traffic, using one or more of the received one or more rules, to one or more of the first and second user equipment via the respective user access network. The method may comprise controlling steering switching and / or splitting of traffic may be using one or more of the allocated first and second identities to determine to which one or more of the first and second user equipment the traffic is to be steered, switched and / or split. The method may comprise transmitting by the first user equipment traffic steered switched and / or split to the first user equipment via the first access network and transmitting by the second user equipment traffic steered switched and / or split to the second user equipment via the second access network. The method may comprise storing a mapping between the first subscriber identity of the first user equipment and the first allocated identifier and a mapping between the second subscriber identity of the second user equipment and the second allocated identifier. The first network access may comprise a first 3GPP access and the second network access may comprise a second 3GPP access. The first and second subscriber identities may be associated with a common subscriber profile. The first subscriber identity may be a first subscription permanent identifier and the second subscriber identity may be a second subscription permanent identifier. The method may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the sixth aspect. The apparatus may comprise or be a first user equipment of the dual steer device, the first user equipment being associated with the first subscription. The apparatus may be the dual steer device and may further comprise a second user equipment, the second user equipment being associated with the second subscription. The apparatus may comprise or be a user equipment of the dual steer device, the first subscription and the second subscription being associated with the user equipment. According to an seventh aspect, there is provided an apparatus comprising: means for receiving a request for a first data session of a dual steer device, the first data session being associated with a first subscriber identifier and providing a first allocated identifier associated with the first subscriber identifier to a policy control function; means for receiving a request for a second data session of the dual steer device., the second data session being associated with a second subscriber identifier and providing a second allocated identifier associated with the second subscriber identifier to the policy control function; and means receiving one or more dual steer policies associated with the first and second allocated identifiers. The apparatus may comprise means for providing the one or more dual steer policies to one or more of the dual steer device and a user plane function for the first and second session. The apparatus may comprise means for retrieving from a user data management function the first allocated identifier associated with the first subscriber identifier and retrieving from the user data management function the second allocated identifier associated with the second subscriber identifier. The request for the first data session may comprise the first allocated identifier and the request for the second data session comprises the second allocated identifier, The apparatus may comprise means for obtaining from access and mobility function the first allocated identifier associated with the first subscriber identifier and obtaining from the access and mobility function the second allocated identifier associated with the second subscriber identifier, the first and second allocated identifiers comprising temporary identifiers. The apparatus of the seventh aspect may comprise means for implementing a session management function. The apparatus may be a session management function. According to an eighth aspect, there is provided a method comprising: receiving a request for a first data session of a dual steer device, the first data session being associated with a first subscriber identifier and providing a first allocated identifier associated with the first subscriber identifier to a policy control function; receiving a request for a second data session of the dual steer device, the second data session being associated with a second subscriber identifier and providing a second allocated identifier associated with the second subscriber identifier to the policy control function; and receiving one or more dual steer policies associated with the first and second allocated identifiers. The method may comprise providing the one or more dual steer policies to one or more of the dual steer device and a user plane function for the first and second session. The method may comprise retrieving from a user data management function the first allocated identifier associated with the first subscriber identifier and retrieving from the user data management function the second allocated identifier associated with the second subscriber identifier. The request for the first data session may comprise the first allocated identifier and the request for the second data session comprises the second allocated identifier. The method may comprise obtaining from access and mobility function the first allocated identifier associated with the first subscriber identifier and retrieving from the access and mobility function the second allocated identifier associated with the second subscriber identifier, the first and second allocated identifiers comprising temporary identifiers. The method of the eighth aspect may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the eighth aspect. The apparatus may implement a session management function. According to a ninth aspect there is provided an apparatus comprising: means for receiving a first allocated identifier associated with a first subscriber of a dual steer device; means for receiving a second allocated identifier associated with a second subscriber identifier of the dual steer device; and means for providing one or more dual steer policies associated with the first and second allocated identifiers for the dual steer device. The apparatus of the ninth aspects may comprise means for implementing a session management function. The apparatus may be a policy control function. According to a tenth aspect there is provided a method comprising: receiving a first allocated identifier associated with a first subscriber of a dual steer device; receiving a second allocated identifier associated with a second subscriber identifier of the dual steer device; and providing one or more dual steer policies associated with the first and second allocated identifiers for the dual steer device. The method of the tenth aspect may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the tenth aspect. The apparatus may implement a policy control function. According to an eleventh aspect, there is provide an apparatus comprising: means for receiving from one or more of the first and / or second user equipment, one or more rules for controlling steering of uplink traffic via one or more of the first and second user equipment, the one or more rules being associated with a first identity of the first user equipment and / or a second identity of the second user equipment, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and means for controlling the steering of traffic using one or more rules associated with the first and second identities, the traffic being steered to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network. The apparatus may comprise the first user equipment and the second user equipment. The first user equipment may be configured to receive the first identity of the first user equipment from a network and the second user equipment may be configured to receive the second identity of the second user equipment from the network. The first user equipment may be configured to receive from the network the first identifier in a registration message or in a packet data unit session establishment message, and / or the second user equipment may be configured to receive from the network the second identifier in a registration message or in a packet data unit session establishment message. The one or more rules may comprise one or more of the first and second identities. The first user equipment may be configured to transmit the traffic steered, switched or split to the first user equipment via the first access network and the second user equipment may be configured to transmit the traffic steered, switched or split to the second user equipment via the second access network. The means for controlling steering of application traffic may be for using one or more first and second identities to determine to which one or more of the first and second user equipment the traffic is to be steered, switched or split. The apparatus may comprise means for storing a mapping between a first subscriber identifier of the first user equipment and the first identifier and a mapping between a second subscriber identifier of the second user equipment and the second identifier. One of the first user equipment and the second user equipment may be configured to receive the one or more rules for controlling the steering of the uplink traffic, the one or more rules defining combined one or more rules for both the first user equipment and the second user equipment, the combined one or more rules including the first identifier and the second identifier. The first network access may comprises a first 3GPP access and the second network access may comprise a second 3GPP access. The first user equipment may be associated with a first subscriber identifier and the second user equipment is associated with a second subscriber identifier. The first and second subscriber identifiers may be associated with a common subscriber profile, The first subscriber identifier may be a first subscription permanent identifier and the second subscriber identifier may be a second subscription permanent identifier. According to an eleventh aspect, there is provide an apparatus comprising: means for receiving from one or more of the first and / or second user equipment, one or more rules for controlling steering of uplink traffic via one or more of the first and second user equipment, the one or more rules being associated with a first identity of the first user equipment and / or a second identity of the second user equipment, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and means for controlling the steering of traffic using one or more rules associated with the first and second identities, the traffic being steered to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network. The apparatus may comprise the first user equipment and the second user equipment. The first user equipment may be configured to receive the first identity of the first user equipment from a network and the second user equipment may be configured to receive the second identity of the second user equipment from the network. The first user equipment may be configured to receive from the network the first identifier in a registration message or in a packet data unit session establishment message, and / or the second user equipment may be configured to receive from the network the second identifier in a registration message or in a packet data unit session establishment message. The one or more rules may comprise one or more of the first and second identities. The first user equipment may be configured to transmit the traffic steered, switched or split to the first user equipment via the first access network and the second user equipment may be configured to transmit the traffic steered, switched or split to the second user equipment via the second access network. The means for controlling steering of application traffic may be for using one or more first and second identities to determine to which one or more of the first and second user equipment the traffic is to be steered, switched or split. The apparatus may comprise means for storing a mapping between a first subscriber identifier of the first user equipment and the first identifier and a mapping between a second subscriber identifier of the second user equipment and the second identifier. One of the first user equipment and the second user equipment may be configured to receive the one or more rules for controlling the steering of the uplink traffic, the one or more rules defining combined one or more rules for both the first user equipment and the second user equipment, the combined one or more rules including the first identifier and the second identifier. The first network access may comprises a first 3GPP access and the second network access may comprise a second 3GPP access. The first user equipment may be associated with a first subscriber identifier and the second user equipment is associated with a second subscriber identifier. The first and second subscriber identifiers may be associated with a common subscriber profile, The first subscriber identifier may be a first subscription permanent identifier and the second subscriber identifier may be a second subscription permanent identifier. The apparatus may be a dual steer device. The apparatus may be a controller. The apparatus may provide a dual steer control layer. According to an twelfth aspect, there is provided a method comprising: receiving from one or more of the first and / or second user equipment, one or more rules for controlling steering of uplink traffic via one or more of the first and second user equipment, the one or more rules being associated with a first identity of the first user equipment and / or a second identity of the second user equipment, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; and controlling the steering of traffic using one or more rules associated with the first and second identities, the traffic being steered to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network. The method may comprise receiving by first user equipment the first identity of the first user equipment from a network and receiving by the second user equipment the second identity of the second user equipment from the network. The method may comprise receiving by first user equipment from the network the first identifier in a registration message or in a packet data unit session establishment message, and / or receiving by the second user equipment from the network the second identifier in a registration message or in a packet data unit session establishment message. The one or more rules may comprise one or more of the first and second identities. The method may comprise transmitting by the first user equipment the traffic steered, switched or split to the first user equipment via the first access network and transmitting by the second user equipment the traffic steered, switched or split to the second user equipment via the second access network. The controlling steering of application traffic may be for using one or more first and second identities to determine to which one or more of the first and second user equipment the traffic is to be steered, switched or split. The method may comprise storing a mapping between a first subscriber identifier of the first user equipment and the first identifier and a mapping between a second subscriber identifier of the second user equipment and the second identifier. The method may comprise receiving by one of the first user equipment and the second user equipment the one or more rules for controlling the steering of the uplink traffic, the one or more rules defining combined one or more rules for both the first user equipment and the second user equipment, the combined one or more rules including the first identifier and the second identifier. The first network access may comprises a first 3GPP access and the second network access may comprise a second 3GPP access. The first user equipment may be associated with a first subscriber identifier and the second user equipment is associated with a second subscriber identifier. The first and second subscriber identifiers may be associated with a common subscriber profile, The first subscriber identifier may be a first subscription permanent identifier and the second subscriber identifier may be a second subscription permanent identifier. The method may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the twelfth aspect. The apparatus may be a controller. The apparatus may provide a dual steer control layer. The apparatus may comprise or be a first user equipment of the dual steer device, the first user equipment being associated with the first subscription. The apparatus may be the dual steer device and may further comprise a second user equipment, the second user equipment being associated with the second subscription. The apparatus may comprise or be a user equipment of the dual steer device, the first subscription and the second subscription being associated with the user equipment. The apparatus may be a dual steer device. The apparatus may be a controller. The apparatus may provide a dual steer control layer. According to a thirteenth aspect, there is provided an apparatus comprising: means for: receiving a request for a first data session of a dual steer device, the first data session being associated with a first subscriber identifier and providing a first allocated identifier associated with the first subscriber identifier to the dual steer device; and receiving a request for a second data session of the dual steer device., the second data session being associated with a second subscriber identifier and providing a second allocated identifier associated with the second subscriber identifier to the dual steer device. The apparatus may comprise means for obtaining the first allocated identifier associated with the first subscriber identifier from a policy control function and obtaining the second allocated identifier associated with the second subscriber identifier from the policy control function. The apparatus of the thirteenth aspects may comprise means for implementing a session management function. The apparatus may be a session management function. According to a fourteenth aspect, there is provided a method comprising: receiving a request for a first data session of a dual steer device, the first data session being associated with a first subscriber identifier and providing a first allocated identifier associated with the first subscriber identifier to the dual steer device; and receiving a request for a second data session of the dual steer device., the second data session being associated with a second subscriber identifier and providing a second allocated identifier associated with the second subscriber identifier to the dual steer device. The method may comprise obtaining the first allocated identifier associated with the first subscriber identifier from a policy control function and obtaining the second allocated identifier associated with the second subscriber identifier from the policy control function. The method of the fourteenth aspect may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the fourteenth aspect. The apparatus may implement a session management function. According to a fifteenth aspect, there is provided an apparatus comprising: means for: allocating a first allocated identifier to a first subscriber identifier associated with a dual steer device and providing the first allocated identifier to a session management function; and allocating a second allocated identifier to a second subscriber identifier associated with the dual steer device and providing the second allocated identifier to the session management function; and means for providing one or more dual steer policies associated with the first and second allocated identifiers for the dual steer device. The apparatus of the fifteenth aspect may comprise means for implementing a policy control function. The apparatus may be a policy control function. According to a sixteenth aspect, there is provided a method comprising: allocating a first allocated identifier to a first subscriber identifier associated with a dual steer device and providing the first allocated identifier to a session management function; and allocating a second allocated identifier to a second subscriber identifier associated with the dual steer device and providing the second allocated identifier to the session management function; and providing one or more dual steer policies associated with the first and second allocated identifiers for the dual steer device. The method of the sixteenth aspect may be performed by an apparatus. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform any of the methods discussed in relation to the sixteenth aspect. The apparatus may implement a policy control function. According to an aspect, there is provided a computer readable medium comprising program instructions stored thereon for performing at least one of the above methods. According to an aspect, there is provided a non-transitory computer readable medium comprising program instructions stored thereon for performing at least one of the above methods. According to an aspect, there is provided a non-volatile tangible memory medium comprising program instructions stored thereon for performing at least one of the above methods. In the above, many different aspects have been described. It should be appreciated that further aspects may be provided by the combination of any two or more of the aspects described above. Various other aspects are also described in the following detailed description and in the attached claims. Brief Description of the Figures Some example, embodiments will now be described, by way of example only, with reference to the accompanying Figures in which: Fig. 1 shows a schematic representation of a 5G system; Fig. 2 shows schematically a first example of a dual steer device and a UPF of a 5GC; Fig. 3 shows schematically a second example of a dual steer device and a UPF of a zr'r'. Fig. 4 shows a schematic representation of an apparatus; Fig. 5 schematically shows a first procedure in which an identifier is allocated by the dual steer device; Fig. 6 schematically shows a second procedure in which an identifier is allocated by the dual steer device; Fig. 7 schematically shows a third procedure in which an identifier is allocated by the dual steer device; Fig. 8 schematically shows a procedure in which an identifier is allocated by unified data management function; Fig. 9 schematically shows a second procedure in which an identifier is allocated by unified data management function; Fig. 10 schematically shows a procedure in which an identifier is allocated by a policy control function; Fig. 11 shows a first method of some example embodiments: Fig. 12 shows a second method of some example embodiments; Fig. 13 shows a third method of some example embodiments; Fig. 14 shows a fourth method of some example embodiments; Fig. 15 shows a fifth method of some example embodiments; Fig. 16 shows a sixth method of some example embodiments; Fig. 17 shows a seventh method of some example embodiments; Fig. 18 shows an eighth method of some example embodiments. Detailed Description In the following certain example embodiments are explained with reference to communication devices capable of communication via a wireless communication system (e.g., a cellular system or a mobile communication system) serving such communication devices. An example wireless communication system is shown in Fig. 1. FIG. 1 shows a schematic representation of a deployment comprising a 5G system (5GS). The 5GS may comprise multiple public land mobile networks (PLMNs). Each PLMN may comprise a wireless access network comprising a plurality of 5G (radio) access network (R)AN 3GPP-1 and 3GPP2, a 5G core network (5GC), one or more application functions (AF) and one or more data networks (DN) 210. In the example shown in Fig. 1, a dual steer device 200 / 300 of some embodiments is connected to the 5GC via two different RANs 3GPP-1 and 3GPP2. The dual steer devices 200 / 300 of some embodiments are described in more detail later. However, it should be appreciated that the dual steer device may be connected via one or one or more different access networks to the example RANs shown in Figure 1. Some examples of an access network is a 5G (radio) access network, for example a3GPP RAN. Other examples of access networks may be untrusted or wireline non 3GPP access to a 3GPP core (N3IWF -Non-3GPP Inter-Working Function or W-AGF- wireline5G access gateway function). In another example, one RAN may correspond to a terrestrial (radio access) network while the other RAN may correspond to a terrestrial (radio access) network. In another example, the two (R)AN may be operated by different operators e.g. different PLMN(s), thus possibly controlled by different AMF(s). A 5G RAN may comprise one or more base stations. A base station may be an evolved NodeB (eNB) or a gNodeB (gNB). A gNB may comprise distributed units connected to one or more centralized units. The 5GC shown in Fig. 1 comprises network functions (NF). The network functions shown in Fig. 1 comprise a unified data repository (UDR), a network exposure function (NEF), a network repository function (NRF), a user data management (UDM) function, a policy control function (PCF), an access and mobility management function (AMF), an authentication server function (AUSF), a session management function (SMF), and a user plane function (UPF) 206. It should be appreciated that more than one of a given type of network function may be provided in the 5GC. It should be appreciated that 5GC shown in Fig. 1 may comprise other network functions (NF). Some embodiments relate to a so-called “ dual steer device”. A dual steer device is a device supporting traffic steering, traffic splitting and / or traffic switching, of user data across two access networks. The user data may relate to a user equipment data session. The two access networks may be different access networks. The access networks may be two 3GPP access networks. For example, in some embodiments, the two access networks may be two different 3GPP access networks. For example, the two different access networks may be provided by different RANs. Traffic steering may steer the traffic to one or other or both of the two access networks. Traffic may be split between both of the two access networks. In another example, the traffic may be directed to only one of the access networks. In another example, the traffic may be switched from one of the two access networks to the other of the two access networks. A dual steer device may be associated with a first subscription and a second subscription. The first subscription is associated with a first subscriber identifier and the second subscription is associated with a second subscriber identifier. The first and second subscriber identifiers are different subscriber identifiers. The first and second subscriber identifiers may be unique identifiers which are used to represent the identity of a subscriber in a network . The first and second subscriber identifiers may comprise a SUPI (subscription permanent identifier) or any other suitable subscriber identifier. Each of the first and second identifiers may be stored in a respective subscriber identity module SIM. For example, the SIM may be store in a universal SIM (USIM). The first and second subscriber identities may be linked to a single subscription profile. When a dual steer device provides dual steering, the dual steer device has a first session with a network associated with the first subscriber identifier and via a first access network and a second session associated with the second subscriber identifier and via a second access network. Traffic such as user data may be sent to the network via the first and second sessions. The traffic may be steered, switched and / or split between the first and second sessions.. The traffic may, for example, comprise data from an application of the dual steer device. The first and second sessions may be packet data unit (PDU) sessions. Reference is made to Figure 2 which shows a first example of a dual steer device 200. The dual steer device 200 in this example comprises a first UE, UE1 and a second UE, UE2. The first UE, UE 1 is associated with the first subscriber identifier, SUPI-land the second UE is associated with a second subscriber identifier, SUPI-2. For example, the first UE, UE1 may have a first SIM, e.g. a USIM, storing the first subscriber identifier, SUPI-1 and the second UE may have a second SIM, e.g. a USIM, storing the second subscriber identifier SUPI-2. A so-called dual steer layer 204 is provided. The dual steer layer comprises a controlling function. The dual steer layer may be implemented by computer executable code running on at least one processor. The dual steer layer may be referred to a controller. The dual steer layer may be implemented by an apparatus such as shown in Figure 4. The first UE. UE 1 has network access via first access network 3GPP1 and the second UE, UE2 has network access via a second access network 3GPP2. The first and second access networks are different. The dual steer layer will manage the steering, switching and / or splitting of traffic to one or other or both of the two access networks via the first and second UEs. The dual steer device may support, if required, simultaneous data transmission over both of the two access networks. The traffic which is managed by the dual steer layer may comprise application traffic from an application 202 or any other suitable traffic. In some embodiments the dual steer device may be provided, for example, within a single housing. In other embodiments, the dual steer device may be implemented as a system. Where the dual steer device is implemented as a system, the dual steer layer part of the system is arranged to communicate with the application, for example, and the first and second UEs. That communication may be wired and / or wireless. Reference is made to Figure 3 which shows a second example of a dual steer device 300. The dual steer device in this example comprises a one UE 302. The UE 302 is associated with the first subscriber identifier SUPI-2 and the second subscriber identifier SUPI-2. For example, the UE may have a first SIM, e.g. a USIM, storing the first subscriber identifier SUP1-land a second SIM, e.g. a USIM, storing the second subscriber identifier SUPI-2. Again a dual steer layer 204 is provided, as discussed in relation to Figure 2. In some embodiments, the dual steer layer and the application may be provided within the UE. The dual steer device may be implemented within the UE In other embodiments, the application and / or the dual steer layer may be outside the UE. The UE has a first network access associated with the first subscriber identifier via a first access network 3GPP1 and a second network access associated with the second subscriber identifier via a second access network 3GPP2. The first and second access networks are different. Regardless of the implementation of the dual-steer device, the dual steer layer 204 may be provided with one or more rules / policies for controlling the steering, switching and / or splitting of the traffic. The dual steer layer is responsible for steering of UL (uplink) data, that is the data from the dual steer device to the network. As shown in both Figures 2 and 3, a user plane function UPF 206 is provided which responsible for steering DL (downlink) data, that is the data from the network to the dual steer device. The UPF is provided with one or more rules / policies 208 for controlling the steering, switching and / or splitting of the DL traffic. The traffic from the dual steer device may be provided by the UPF 206 to a DN 210. The DN 210 may provide traffic to the UPF which is for the dual steer device. In some embodiments, the dual-steer device may support traffic steering, splitting, and / or switching of the user data across two access networks. Data anchoring may be provided in the HPLMN (home public land mobile network) or in the SNPN (Standalone Non Public Network). The user data may be for different services or for the same service. In some embodiments, the dual-steer device may aim to minimize service interruption when switching the user data, between the two access networks. In some embodiments, the dual-steer device may support changing one 3GPP access network to a non-3GPP access network of the same subscription (and vice versa). One or more of the following traffic steering, switching and / or splitting examples may be supported by a dual steer device of some embodiments: traffic steering, switching and / or splitting between two 3GPP access networks belonging to the same or different PLMN(s) or SNPN. The two 3GPP access networks may be associated with the same or with different RAT (radio access technology). An example of usage of different kinds of 3GPP access is where one corresponds to a terrestrial access network (TNT) and the other to a non terrestrial access network; traffic steering , switching and / or splitting between two 3GPP access networks of one PLMN and one PNI-NPN (public network integrated non-public network). The two 3GPP access networks may be associated with the same or with different RAT (radio access technology); and / or traffic steering, switching and / or splitting across LTEZEPC (long term evolution / evolved packet core) and NR / 5GC (new radio / 5G core), with anchoring in 5GC. In other words one access network may be a 4G access network and the other access network may be a 5G access network. The dual steer rules may comprise, for example, traffic descriptors defining for which traffic the rule(s) apply, information about how to send the LJL / DL traffic, conditions about when to switch traffic to another path, and / or the like. In some example embodiments, the dual steer rules need to be consumed by the dual steer layer in the dual steer device which is above the two parts of the dual steer device associated with the respective subscriber identifiers SUPIs of the dual steer device. In some example embodiments, the dual steer layer may need to uniquely identify each of the UEs in the case of a dual steer device comprises 2 UEs. Where the dual steer device comprises a common UE, the dual steer layer needs to be able to identify the different parts (communication capabilities) of the common UE associated with different subscriber identifiers. It may be undesirable to expose the two subscriber identifiers associated with a dual steer device to a dual steer layer. This may be to protect the security of the subscriber identifiers. In the following examples, a dual steer device with two UEs each having its own subscriber identifier is used to illustrate some example embodiments. However, it should be appreciated that the example embodiments may also be used with a dual steer device having a UE with one part (communication capabilities) associated with one subscriber identifier and one part (communication capabilities) associated with the other subscriber identifier. In the following references to parts of the UE are to a dual steer device which has a UE with one part associated with the first subscriber identifier and one part associated with the second subscriber identifier. In some example embodiments, the network sends rules to via a path associated with one or both the subscriber identifiers of the dual steer device. The PCF may send the rules to the dual steer device. The rules that are sent to an UE or a part of the dual steer device associated with one of the subscriber identifiers are propagated to the dual steer layer . The dual steer layer will use the rules to steer the traffic. The rules may identify an access network. For example, a dual steer rule may be per access network (per subscriber identifier). By way of example, in case of active-standby, a dual steer rule may ensure that all traffic of all PDU (packet data unit) sessions is sent via the same network access associated with one of the subscriber identifiers. In one example embodiment, an identifier is allocated by the dual steer device to each of the two UEs or each part of the UE and is not known to the network. For example, the dual steer device assigns an identifier to each subscriber identifier. The dual steer layer may assign an identifier to each subscriber identifier. Each identifier uniquely identifies the subscriber identifier within the dual steer device. Where the dual steer device comprises two UEs, one identifier is assigned to each UE. The allocated identifiers are stored in each UE. Where dual steer device comprises one UE, a respective identifier is assigned to each of the subscriber identifiers. The network may send the dual steer rules to one or both of the subscriber identifiers via the respective network access. The dual steer rules may comprise an with an indication that it is a rule for dual steering. A UE route selection policy (URSP) rule may contains a traffic descriptor (TD) that identifies the application and for each TD a one / more corresponding route selection descriptor (RSD) which provides the PDU session parameters e.g. PDU session type, DNN (data network name) / S-NSSAI (single network slice selection assistance information) to be used, preferred access type and / or the like. The URSP may include a dual steer indication in a RSD parameter. If a dual steer indication is present in the RSD parameter, this indicates to a UE or relevant part (communication capabilities) of the UE that for a PDU session to a DNN / S-NSSAI combination, the UE can request a dual steer PDU session. The UE route selection policy (URSP) may include a dual steer parameter “DualSteer Active = YES / NO” in a RSD, which indicates to the UE or relevant part (communication capabilities) of the UE whether this UE or the relevant part (communication capabilities) of the UE is the preferred active path or a standby path for the application identified by the TD. When the part of the dual steer device associated with the respective subscriber identity receives the rules, the rules are provided to the dual steer layer along with identifier assigned to the respective subscriber identity by the dual steer layer. Based on this identifier, the dual steer layer can identify from which UE or which part of the UE the rules are coming from and hence for which UE or which part of the UE the rules are associated with. The dual steer device may refresh an allocated identifier based on the local policy. Once the dual steer layer has provided the new identifier associated with the respective subscriber, the new identifier is stored by the respective UE or part of the UE. In this example, the rules sent by the network via one of two network accesses implicitly identify this UE or part of the UE. The received rules are then provided to the and dual steer layer. In one example of rules, if the first subscriber identifier is be associated with an session which is to be active flow while the second subscriber identifier is be associated with a session having a standby status , the network sends a rule (traffic filter, status = active) to the first UE, UE1 or the part of the UE associated with the first subscriber identifier and another rule (same traffic filter, status = stand-by) to the second UE, UE2 or the part of the UE associated with the second subscriber identifier In another example of rules, if the sessions associated with the first and second subscriber identifiers, are to load share a flow, the network sends a rule (traffic filter, load sharing X%) to the first UE, UE I or the part of the UE associated with the first subscriber identifier and a rule (same traffic filter, load sharing 100-X%)) to the second UE2or the part of the UE associated with the second subscriber identifier. In another example of rules, if the sessions associated with the first and second subscriber identifiers, are to be in a lowest delay mode for a flow, the network sends a rule (traffic filter, lowest delay) to the first UE, UE 1 or the part of the UE associated with the first subscriber identifier and to the second UE, UE2 or the part of the UE associated with the second subscriber identifier. In another example embodiment, an respective identifier is allocated by the dual steer device which is associated with a respective one of the subscriber identifiers. The respective allocated identifiers are stored by the respective UE or the part of the UE. Each UE or the part of the UE provides the respective allocated identifier to the network. The dual steer device assigns an identifier which is associated with a respective one of the subscriber identifiers. This identifier may be unique registration identity (Reg-Id) or other suitable identifier that is generated by the dual steer layer of the dual steer device and provided to each UE or the part of the UE. A different unique registration identifier or other suitable identifier associated with a respective one of the subscriber identifiers is generated by the dual steer device. The allocated identifier may then be provided by a UE or respective part of the UE to the network. This may be during a registration process or during a PDU session establishment process. The network uses the allocated identifiers to generate the dual steer rules for the dual steer device. In this example, the rules may only need to be provided by the network via one of the subscriber identifiers. The rule content may identify which part of the UL traffic each UE or respective part of the dual steer device, needs to handle. In another example of a rule, if session associated with the first subscriber identifier is to be active for a flow while a session associated with the second subscriber identifier is on stand-by, the network sends a rule (traffic filter, UE1 identified by its Registration ID, status active) to either of the UE(s) or either part of the UE. The network may send in the same rule or a different rule (traffic filter, UE2 identified by its Registration ID, status standby). This may be sent to either of the UE(s) or either part of the UE. In another example of rules, if the sessions associated with the first and second subscriber identifier, are to load share a flow, the network sends a rule ((traffic filter, load sharing X% for the first UE,UE1 or respective part of the UE identified by its Registration ID, 100-X% for the second UE,UE2 or respective part of the UE identified by its Registration ID) to either of the UE(s) or either part of the UE. In this regard, reference is made to Fig. 5 which shows a procedure in which an identifier is allocated by the dual steer device to each of the two UEs or parts of the UE and each UE or part of the UE provides the allocated identifier to the network in a registration procedure. As referenced at 0, the dual steer layer in the dual steer device generates a first identifier, for example Reg-Id-1, and provides the first identifier to the first UE, UE-1 or the part of the UE associated with the first subscriber identifier. The dual steer layer in the dual steer device generates a second identifier, for example Reg-Id-2, and provides the identifier to the second UE-2 or the part of the UE associated with the second subscriber identifier. As referenced at 1, the first UE, UE-1 or the part of the UE associated with the first subscriber identifier triggers a registration procedure and provides the first generated identifier, Reg-Id-1, and the first subscriber identifier, SUPI-1, to the AMF. The AMF provides the first generated identifier, Reg-Id-1, and the first subscriber identifier, SUPI-1 to the UDM. The UDM stores the first generated identifier, Reg-Id-1, with the first subscriber identifier, SUPI-1. As referenced at 2, the second UE, UE-2 or the part of the UE associated with the second subscriber identifier triggers a registration procedure and provides the second generated identifier, Reg-Id-2, and the second subscriber identifier, SUPI-2, to the AMF. The AMF provides the second generated identifier, Reg-Id-2, and the second subscriber identifier, SUPI-2 to the UDM. The UDM stores the second generated identifier, Reg-Id-2, with the second subscriber identifier, SUPI-2. As referenced at 3, the first UE, UE1 or the part of the UE associated with the first subscriber identifier sends a PDU session establishment request to the AMF. The AMF provides the PDU session establishment request to the SMF. As referenced at 4, the SMF retrieves the subscription data associated with the first subscriber identifier. The UDM provides the first generated identifier, Reg-Id-1, associated with the first subscriber identifier, SUP1-1 to the SMF. As referenced at 5, the SMF provides the first generated identifier, Reg-Id-1, associated with the first subscriber identifier, SUPI-1 to the PCF during the SM (session management) policy association establishment. As referenced at 6, the second UE, UE2 or the part of the UE associated with the second subscriber identifier sends a PDU session establishment request to the AMF. The AMF provides the PDU session establishment request to the SMF. As referenced at 7, the SMF retrieves the subscription data associated with the second subscriber identifier. The UDM provides the second generated identifier, Reg-Id-2, associated with the second subscriber identifier, SUPI-2 to the SMF. As referenced at 8, the SMF provides the second generated identifier, Reg-Id-2, associated with the second subscriber identifier, SUPI-2 to the PCF during the SM policy association establishment. As referenced at 9, the PCF considers the first and second generated identifiers, Reg-Id-1 and Reg-Id-2 during the generation of the dual steer rules / policies. Some examples of the generated dual steer rules / policies by PCF are as following: Example-1: Steering mode: Active-standby: The network access associated with the first generated identifier Reg-Id-1 is Active, and the network access associated with the second generated identifier Reg-Id-2 is standby. Example-2: Steering mode: Load-balancing: Send X% of traffic to the network access associated with the first generated identifier Reg-Id-1, and 100-X% of traffic to the network access associated with the second generated identifier Reg-Id-2 Example-3: Steering mode: smallest delay: Use the network access with the smallest delay. In this example, there is no need to use the generated identifiers in the rules. As referenced at 10, the PCF provides the generated dual steer rules / policies to the SMF. As referenced at 11, the SMF provides the dual steer rules / policies to one or both of the first and second UEs, UE1 and UE2 or one or more both parts of the UE. The delivery of the dual steer rules / policies can be done as part of the PDU session establishment accept message for one or both of the sessions associated with the first and second identifiers. Alternatively, the delivery of the dual steer rules / policies can be done as part of a DL NAS (non-access stratum) transport message generated by the AMF upon a request from SMF. In some example embodiments, the SMF may provide the dual steer rules / policies to the UPF (not shown). The part or parts of the UE, or the one or more UEs which received the dual steer rules / policies, provide those dual steer rules / policies to the dual steer layer. The dual steer layer of the dual steer device then uses the provided dual steer rules / policies for steering the UL traffic. The UPF then uses the provided dual steer rules / policies for steering the downlink traffic. Reference is made to Fig. 6 which shows a procedure in which an identifier is allocated by the dual steer device to each of the two UEs or each part of the UE. Each UE or each part of the UE provides the allocated identifier to the network in a PDU session establishment procedure. As referenced at 0, the dual steer layer in the dual steer device generates an identifier, for example the first generated identifier Reg-Id-1, and provides the first subscriber identifier to the first UE-1 or first part of the UE. The dual steer layer in the dual steer device generates a s second identifier, for example Reg-Id-2, and provides the subscriber identifier to the second UE-2 or second part of the UE. As referenced at 1, the first UE, UE1 or first part of the UE sends a PDU session establishment request to the AMF. The AMF provides the PDU session establishment request to the SMF. The PDU session establishment request provides the first generated identifier, Reg-Id-1, and the first subscriber identifier, SUPI-1. As referenced at 2, the SMF provides the first generated identifier, Reg-Id-1, associated with the first subscriber identifier, SUPI-1 to the PCF during the SM policy association establishment. As referenced at 3, the second UE, UE2 or second part of the UE sends a PDU session establishment request to the AMF. The AMF provides the PDU session establishment request to the SMF. The PDU session establishment request provides the second generated identifier, Reg-Id-2, and the second subscriber identifier, SUPI-2. As referenced at 4, the SMF provides the second generated identifier, Reg-Id-2, associated with the second subscriber identifier, SUPI-2 to the PCF during the SM policy association establishment. As referenced at 5, the PCF considers the generated identifiers, Reg-Id-1 and Reg-Id-2 during the generation of the dual steer rules / policies. This may be as described in relation to the corresponding part of the procedure of Fig. 5. As referenced at 6, the PCF provides the generated dual steer rules / policies to the SMF. As referenced at 7, the SMF provides the dual steer rules / policies to one or both of the first and second UEs, UE1 and UE2 or one or both of the respective parts of the UE. The delivery of the dual steer rules / policies can be done as part of the PDU session establishment accept message for one or both of the respective sessions for the first and second subscriber identifiers . Alternatively, the delivery of the dual steer rules / policies can be done as part of a DL NAS (non-access stratum) transport message generated by the AMF upon a request from SMF. In some example embodiments, the SMF may provide the dual steer rules / policies to the UPF (not shown). In a modification to the procedure of Fig. 6, the generated identifier may be provided by a respective UE or respective part of the UE as part of the UL NAS transport sent from a UE or respective part of a UE to the AMF that carries the PDU Session Establishment. In this example, the AMF provides the generated identifier to the SMF. In another example embodiment, an identifier is allocated by the dual steer device to each of the two UEs or each of the two parts of the UE. The respective identifiers are stored by the respective UE or respective part of the UE. Each UE or part of the UE maps the allocated identifier to the 5G-GUTI (5G globally unique temporary identifier) or other temporary identifier assigned by the network. Each UE or part of the UE provides the allocated identifier to the network. In this example, the dual steer device assigns an identifier for each UE or part of the UE. This identifier can be, for example, a unique registration ID (Reg-Id) that is generated by the dual steer layer of the dual steer device and provided to each UE or part of the UE. The network (for example, the AMF) assigns a temporary identifier 5G-GUTI for subscriber identifier. This 5G-GUTI may be assigned as a part of a registration accept. Each UE or part of the UE maps the 5G-GUTI to the identifier assigned by the dual steer device and stores the mapping between the 5G-GUTI and the identifier. When the network assigns new dual steer rules associated with a respective subscriber identifier, upon receipt, the UE includes the corresponding allocated identifier to associate the rules to the corresponding UE / 5G-GUTI. Fig. 7 which shows a procedure in which an identifier is allocated by the dual steer device to each of the two UEs or each part of the UE and each UE or part of the UE stores the allocated identifier. The identifier is mapped by the respective UE or part of the UE to the respective 5G-GUTI assigned by the network to the respective UE or part of the UE. The 5G-GUTI is used as the identifier that distinguishes each UE or each part of the UE and hence the dual steer rules / policies. It should be appreciated that in other example embodiments, any other suitable temporary identifier allocated by the network may be used instead of the 5G-GUTI. As referenced at 0, the dual steer layer in the dual steer device generates a first identifier, for example Reg-Id-1, and provides the first identifier to the first UE,UE1 or respective part of the UE . The dual steer layer in the dual steer device generates a second identifier, for example Reg-Id-2, and provides the identifier to the second UE,UE2 or respective part of the UE Alternatively, the first identifier is allocated by the first UE or the part of the UE associated with the first subscriber identifier and the second identifier is allocated by the second UE or the part of the UE associated with the second subscriber identifier. Each UE or part of the UE provides their respective identifier to the dual steer layer. As referenced at 1, the first UE, UE-1 or the part of the UE associated with the first subscriber identifier sends a registration request, with the first subscriber identifier, SUPI-1, to the AMF. The AMF provides the first subscriber identifier, SUPI-1 to the UDM. As referenced at 2, the second UE, UE-2 or the part of the UE associated with the second subscriber identifier sends a registration request, with the subscriber identifier, SUPI-2, to the AMF. The AMF provides the second subscriber identifier, SUPI-2 to the UDM. As referenced at 3, the AMF allocates a first temporary identifier 5G-GUTI-1 to the first subscriber identity The AMF provides the first temporary identifier 5G-GUTI-1 to the first UE, UE-1 or the part of the UE associated with the first subscriber identifier. This may be in a registration accept message. As referenced at 4, the AMF allocates a second temporary identifier 5G-GUTI-2 to the second subscriber identity . The AMF provides the second temporary identifier 5G-GUTI-2 to the second UE, UE-2 or the part of the UE associated with the second subscriber identifier. This may be in a registration accept message. As referenced at 5, the first UE, UE1 or the part of the UE associated with the first subscriber identifier sends a PDU session establishment request to the AMF. The AMF provides the PDU session establishment request to the SMF. As referenced at 6, the SMF obtains the first temporary identifier 5G-GUTI-1 for the first subscriber identifier, SUPI-1. As referenced at 7, the SMF provides the first temporary identifier 5G-GUTI-1, associated with the subscriber identifier, SUPI-1 to the PCF during the SM (session management) policy association establishment. As referenced at 8, the second UE, UE2 or the part of the UE associated with the second subscriber identifier sends a PDU session establishment request to the AMF. The AMF provides the PDU session establishment request to the SMF. As referenced at 9, the SMF obtains the second temporary identifier 5G-GUTI-2 for the second subscriber identifier, SUPI-2. As referenced at 10, the SMF provides the second temporary identifier 5G-GUTI-2, associated with the second subscriber identifier, SUPI-2 to the PCF during the SM (session management) policy association establishment. As referenced at 11, the PCF considers the first and second temporary identifiers, 5G-GUTI-1 and 5G-GUTI-2 during the generation of the dual steer rules / policies. As referenced at 12, the PCF provides the generated dual steer rules / policies to the SMF. As referenced at 13, the SMF provides the dual steer rules / policies to one or both of the first and second UEs, UE1 and UE2 or one or both of the respective parts of the UE.. The dual steer rules / policies may also be provided to the UPF. One or both of the UEs or one or both of the respective parts of the UE provide the dual steer rules to the dual steer layer. However the values of the first temporary identifier 5G-GUTI-1 are replaced by the first identifier Reg-Id-1. The values of the second temporary identifier 5G-GUTI-2 are replaced by the second identifier Reg-Id-2. In the way the 5G-GUTI values are not exposed to the dual steer layer. In another example embodiment, the identifiers for the first and second UEs or parts of the UE are allocated by the network. The UDM may be aware of the dual steer device based on the indication from one or both of the UEs or one or both parts of the UE and associated subscription data. The UDM may generates an identifier which is associated with each subscriber identifier. The UDM may provide the generated identifiers to the AMF during registration and / or to the SMF during PDU session establishment, The generated identifiers may be provided as part of the subscription data. The generated identifier may be a temporarily generated identifier valid for the current subscriber identifier registration or the generated identifier can be a static value provisioned as part of the subscription data. The AMF or the SMF may provide the generated identifier to the respective UE or part of the UE as a part of the registration accept message or as part of the PDU Session establishment accept message (NAS) or in any other message. Each UE or part of the UE stores the respective generated identifier. Each UE or part of the UE provides the respective generated identifier to the dual steer layer. The network uses the generated identifier to generate the dual steer rules for the dual steer device. The steering rules sent by the network to the UE or part of the UE may be as previously discussed. Fig. 8 shows a procedure in which an identifier is allocated by the UDM to each of the subscriber identifiers. As referenced at 1, the first UE, UE-1 or the part of the UE associated with the first subscriber identifier sends a registration request, with the first subscriber identifier, SUPI-1, to the AMF. The registration request may include an indication that the subscriber identifier is associated with a dual steer device. As referenced at 2, the AMF provides the first subscriber identifier, SUPI-1 and the indication of dual steer device to the UDM and the UDM generates the first identifier, Reg-Id-1, for the first UE, UE1 or the part of the UE associated with the first subscriber identifier. The UDM provides the first identifier, Reg-Id-1, associated with the first subscriber identifier, SUPI-1 to the AMF. As referenced at 3, the AMF sends the first generated identifier, Reg-Id-1, to the first UE or the part of the UE associated with the first subscriber identifier. This may be in a registration accept message. As referenced at 4, the second UE, UE-2 or the part of the UE associated with the second subscriber identifier sends a registration request, with the second subscriber identifier, SUPI-2, to the AMF. The registration request may include an indication that the subscriber identifier is associated with a dual steer device. As referenced at 5, the AMF provides the second subscriber identifier, SUPI-2 and the indication of dual steer device to the UDM and the UDM generates the second identifier, Reg-Id-2, for the second UE, UE2 or the part of the UE associated with the second subscriber identifier. The UDM provides the second generated identifier, Reg-Id-2, associated with the second subscriber identifier, SUPI-2 to the AMF. As referenced at 6, the AMF sends the second identifier, Reg-Id-2, to the second UE or the part of the UE associated with the second subscriber identifier. This may be in a registration accept message. This may be followed for example by the part of the procedure referenced 3 to 11 of Fig. 5. Fig. 9 shows another procedure in which an identifier is allocated by the UDM to each of the two UEs or each part of the UE and each UE or part of the UE stores the allocated identifier. As referenced at 1, the first UE, UE1 or the part of the UE associated with the first subscriber identifier sends a PDU session establishment request to the AMF in the signalling connection of the first subscriber identifier, SUPI-1. The PDU session establishment request may include an indication that the subscriber identifier is associated with a dual steer device. The AMF provides the PDU session establishment request to the SMF. As referenced at 2, the UDM provides the first generated identifier, associated with the first subscriber identifier, SUPI-1 to the SMF. The UDM generates the first identifier. As referenced at 3, the SMF provides the first generated identifier associated with the subscriber identifier, SUPI-1 to the PCF during the SM policy association establishment. As referenced at 4, the SMF sends a PDU session establishment accepted message to the first UE or the part of the UE associated with the first subscriber identifier with the first generated identifier associated with the first subscriber identifier, SUPI-1. As referenced at 5, the second UE, UE2 or the part of the UE associated with the second subscriber identifier sends a PDU session establishment request to the AMF in the signalling connection of the second subscriber identifier, SUPI-2. The PDU session establishment request may include an indication that the subscriber identifier is associated with a dual steer device. The AMF provides the PDU session establishment request to the SMF. As referenced at 6, the UDM provides the second identifier, associated with the second subscriber identifier, SUPI-2 to the SMF. The UDM generates the second identifier. As referenced at 7, the SMF provides the second generated identifier associated with the subscriber identifier, SUPI-2 to the PCF during the SM policy association establishment. As referenced at 8, the SMF sends a PDU session establishment accepted message to the second UE or the part of the UE associated with the second subscriber identifier with the second generated identifier associated with the second subscriber identifier, SUPI-2. As referenced at 9 the PCF uses the first and second generated identifiers during the generation of the dual steer rules / policies. As referenced at 10, the PCF provides the generated dual steer rules / policies to the SMF. As referenced at 11, the SMF provides the dual steer rules / policies to one or both of the first and second UEs, UE1 and UE2 or one or both of the respective parts of the UE. In some example embodiments, the SMF may provide N4 rules related to the dual steer rules / policies to the UPF (not shown). The UE or UEs, or part or parts of the UE which received the dual steer rules / policies, provide those dual steer rules / policies to the dual steer layer. The dual steer layer of the dual steer device then uses the provided dual steer rules / policies for steering the UL traffic. The UPF then uses the provided dual steer rules / policies for steering the downlink traffic. It has to be noted that the procedure shown in Fig. 9 may have a relatively limited or no impact on the AMF. In another example embodiment, the PCF may allocate temporary identifiers associated with the first subscriber identifier and the second subscriber identifier. This may be based on an indication from a respective UE or part of the UE indicating support of dual steering and / or subscription data. The subscription data may be associated with the common subscription profile. The PCF may provide the respective generated identifier to an SMF. The SMF may deliver the respective generated identity to the respective UE or part of the UE via NAS messaging. In this regard, reference is made to Fig. 10 which shows a procedure in which an identifier is allocated by the PCF. As referenced at 1, the PCF is configured with or generates a first identifier, for the first subscriber identifier, SUPI-1 and a second identifier, for the second subscriber identifier, SUPI-2. As referenced at 2, the first UE, UE1 or the part of the UE associated with the first subscriber identifier sends a PDU session establishment request to the AMF with the first subscriber identifier, SUPI-1. The request may include an indication that the subscriber identifier is associated with a dual steer device. The AMF provides the PDU session establishment request to the SMF. As referenced at 3, the PCF provides the first generated identifier associated with the subscriber identifier, SUPI-1 to the SMF during the SM policy association establishment. As referenced at 4, the SMF sends a PDU session establishment accepted message to the first UE or the part of the UE associated with the first subscriber identifier, with the first generated identifier associated with the first subscriber identifier, SUPI-1. As referenced at 5, the second UE, UE2 or the part of the UE associated with the second subscriber identifier sends a PDU session establishment request to the AMF with the second subscriber identifier, SUPI-2. The request may include an indication that the subscriber identifier is associated with a dual steer device. The AMF provides the PDU session establishment request to the SMF. As referenced at 6, the PCF provides the second generated identifier associated with the subscriber identifier, SUPI-2 to the SMF during the SM policy association establishment. As referenced at 7, the SMF sends a PDU session establishment accepted message to the second UE or the part of the UE associated with the second subscriber identifier with the second generated identifier associated with the second subscriber identifier, SUPI-2. As referenced at 8, the PCF uses the first and second generated identifiers during the generation of the dual steer rules / policies. As referenced at 9, the PCF provides the generated dual steer rules / policies to the SMF. As referenced at 10, the SMF provides the dual steer rules / policies to one or both of the first and second UEs, UE1 and UE2 or one or both parts of the UE. In some example embodiments, the SMF may provide the dual steer rules / policies to the UPF (not shown). The UE or UEs, or part or parts of the UE which received the dual steer rules / policies, provide those dual steer rules / policies to the dual steer layer. The dual steer layer of the dual steer device then uses the provided dual steer rules / policies for steering the UL traffic. The UPF then uses the provided dual steer rules / policies for steering the downlink traffic. It has to be noted that the procedure shown in Fig. 10 may have a relatively limited or no impact on the AMF In some of the examples, a Registration ID (Reg-Id) is used as the identifier. However this is by way of example and any other suitable identifier may be used. FIG. 4 illustrates an example of an apparatus 201. The apparatus 201 may comprise or implement one or more of the network functions shown in FIG. 1. The apparatus 201 may have at least one processor and at least one memory storing instructions of one or more the network functions shown in FIG. 1 that, when executed by at least one of the at least one processor cause operations or actions of the one or more network functions to be performed. Alternatively, the apparatus 201 may comprise or implement at least a part of the dual steer device of Fig. 2 or of Fig. 3. The apparatus 201 may have at least one processor and at least one memory storing instructions that, when executed by at least one of the at least one processor cause operations or actions of at least a part of the dual steer device to be performed. In this example, the apparatus 201 may comprise at least one random access memory (RAM) 211a, and / or at least one read only memory (ROM) 211b. The apparatus 201 may comprise at least one processor 212, 213 and / or a network interface 214. The at least one processor 212, 213 may be coupled to the at least one memory which in this example is the RAM 211a and the ROM 211b. The at least one processor 212, 213 may be configured to execute an appropriate software code 215. The software code 215 may, for example, include software code of one or more of the network functions or at least a part of the dual steer device. The software code may include software code which allows the apparatus to perform one or more operations of one or more of the present aspects. Reference is made to Fig. 11 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may be provided in a dual steer device. The apparatus may comprise a dual steer device. The apparatus may comprise or be a controller of a dual steer device (e.g. a dual steer layer). The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 2, 3 or 4, The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced Al, allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network.. The method may comprise as referenced A2, controlling steering, switching or splitting of traffic, using one or more rules associated with the first and / or second allocated identities, to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network. It should be appreciated that the method outlined in Fig. 11 may be modified to include any of the previously described features. Reference is made to Fig. 12 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may be provided in a dual steer device. The apparatus may comprise a dual steer device. The apparatus may comprise or be a controller of a dual steer device (e.g. a dual steer layer). The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 2, 3 or 4. The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced Bl, allocating a first identity, said first identity being associated with a first subscriber identity and for allocating a second identity, said second identity being associated with a second subscriber identity. The method may comprise as referenced B2, controlling the steering, switching and / or splitting of traffic using one or more rules associated with the first and second identities, the traffic being sent via one or more of a first access network associated with the first subscriber identifier and a second access network associated with the second subscriber identifier. It should be appreciated that the method outlined in Fig. 12 may be modified to include any of the previously described features. Reference is made to Fig. 13 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may comprise or implement a session management function. The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 4, The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced Cl, receiving a request for a first data session of a dual steer device, the first data session being associated with a first subscriber identifier and providing a first allocated identifier associated with the first subscriber identifier to a policy control function. The method may comprise as referenced C2, receiving a request for a second data session of the dual steer device, the second data session being associated with a second subscriber identifier and providing a second allocated identifier associated with the second subscriber identifier to the policy control function. The method may comprise as referenced C3, receiving one or more dual steer policies associated with the first and second allocated identifiers. It should be appreciated that the method outlined in Fig. 13 may be modified to include any of the previously described features. Reference is made to Fig. 14 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may comprise or implement a policy control function. The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 4, The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced DI, receiving a first allocated identifier associated with a first subscriber of a dual steer device. The method may comprise as referenced D2, receiving a second allocated identifier associated with a second subscriber identifier of the dual steer device. The method may comprise as referenced D3, providing one or more dual steer policies associated with the first and second allocated identifiers for the dual steer device. It should be appreciated that the method outlined in Fig. 14 may be modified to include any of the previously described features. Reference is made to Fig. 15 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may be provided in a dual steer device. The apparatus may comprise a dual steer device. The apparatus may comprise or be a controller of a dual steer device (e.g. a dual steer layer). The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 2, 3 or 4. The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced El allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network. The method may comprise as referenced E2, receiving from one or more of the first and second user equipment, one or more rules for controlling steering of uplink traffic via one or more of the first and second user equipment identified by first allocated identity or second allocated identity. It should be appreciated that the method outlined in Fig. 15 may be modified to include any of the previously described features. Reference is made to Fig. 16 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may be provided in a dual steer device. The apparatus may comprise a dual steer device. The apparatus may comprise or be a controller of a dual steer device (e.g. a dual steer layer). The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 2, 3 or 4. The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced Fl, receiving from one or more of the first and / or second user equipment, one or more rules for controlling steering of uplink traffic via one or more of the first and second user equipment, the one or more rules being associated with a first identity of the first user equipment and / or a second identity of the second user equipment, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network. The method may comprise as referenced F2, controlling the steering of traffic using one or more rules associated with the first and second identities, the traffic being steered to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network. It should be appreciated that the method outlined in Fig. 16 may be modified to include any of the previously described features. Reference is made to Fig. 17 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may comprise or implement a session management function. The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 4, The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced Gl, receiving a request for a first data session of a dual steer device, the first data session being associated with a first subscriber identifier and providing a first allocated identifier associated with the first subscriber identifier to the dual steer device. The method may comprise as referenced G2, receiving a request for a second data session of the dual steer device., the second data session being associated with a second subscriber identifier and providing a second allocated identifier associated with the second subscriber identifier to the dual steer device. It should be appreciated that the method outlined in Fig. 17 may be modified to include any of the previously described features. Reference is made to Fig. 18 which shows a method of some example embodiments. This method may be performed by an apparatus. The apparatus may comprise or implement a policy control function. The apparatus may comprise suitable means, such as circuitry for providing the method. Alternatively or additionally, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor cause the apparatus at least to provide the method below. Alternatively or additionally, the apparatus may be such as discussed in relation to Fig. 4, The method may be provided by computer program code or computer executable instructions. The method may comprise as referenced Hl, allocating a first allocated identifier to a first subscriber identifier associated with a dual steer device and providing the first allocated identifier to a session management function. The method may comprise as referenced H2, allocating a second allocated identifier to a second subscriber identifier associated with the dual steer device and providing the second allocated identifier to the session management function. The method may comprise as referenced H3, providing one or more dual steer policies associated with the first and second allocated identifiers for the dual steer device. It should be appreciated that the method outlined in Fig. 18 may be modified to include any of the previously described features. Computer program code may be downloaded and stored in one or more memories of the apparatus described herein. Therefore, although certain example embodiments were described above by way of example and with reference to certain example architectures for communication systems operated by mobile network operators, technologies and standards, further example embodiments may be applied to any other suitable forms of communication systems than those illustrated and described herein. For example, some example embodiments have been described in relation to a 5G communication system (5GS). It should be appreciated that other embodiments may be provided in any other suitable communication system(s) or in any suitable combination with a 5GS. As used herein, “at least one of the following: ” and “at least one of ” and similar wording, where the list of two or more elements are joined by “and” or “or”, mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements. As used herein, the expression “and / or” includes any and all combinations of the listed terms, including at least any one of the elements, or at least any two or more of the elements, or at least all of the elements. As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs as one or more intervening steps may be included therebetween. Analogously, performing a step or functionality “based on A” does not indicate that the step or functionality is performed solely based on “A” as one or more additional conditions may be included in addition to “A”. In general, the various example embodiments of this disclosure may be implemented in hardware or special purpose circuitry, software, logic or any combination thereof. Some aspects of this disclosure may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the disclosure is not limited thereto. While various aspects of this disclosure may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof. As used herein, the term “circuitry” may refer to one or more or all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and (b) combinations of hardware circuits and software, such as (as applicable): (i) a combination of analog and / or digital hardware circuit(s) with software / firmware and (ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.” This definition of circuitry applies to all uses of this term herein, including in any claims. As a further example, as used here, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, an integrated circuit such as a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, and / or other computing or network device. The various example embodiments of this disclosure may be implemented by computer software executable by a data processor of the mobile device, such as in the processor entity, or by hardware, or by a combination of software and hardware. Computer software or program, also called program product, including software routines, applets and / or macros, may be stored in any apparatus-readable data storage medium and they comprise program instructions to perform particular tasks. A computer program product may comprise one or more computerexecutable components which, when the program is run, are configured to carry out the various example embodiments of this disclosure. The one or more computer-executable components may be include software code or any portion(s ) thereof. Further in this regard it should be noted that any blocks of the logic flow as in the Figures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions. The software may be stored on physical media such as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media ( for example DVD and the data variants thereof, CD). The physical media is a non-transitory media. The term “non-transitory,” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM). The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The data processors may be of any type suitable to the local technical environment, and may comprise one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), FPGA, gate level circuits and processors based on multi core processor architecture, as non-limiting examples. Embodiments of the disclosure may be practiced in various components such as integrated circuit modules. The design of integrated circuits is by and large a highly automated process. Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate. The foregoing description has provided, by way of non-limiting examples, a full and informative description of the various example embodiments of this disclosure. However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings and the claims. Indeed, there are further example embodiments comprising a combination of one or more example embodiments with any of the other example embodiments described herein. The scope of protection sought for some of the various example embodiments of this disclosure is set out by the claims. The various example embodiments in addition to its respective aspects and features thereof described herein that do not fall under the scope of the claims (if any) are to be interpreted as examples useful for understanding the various example embodiments of this disclosure. It should be noted that different claims with differing claim scope may be pursued in related applications, such as divisional or continuation applications.

Claims

1. An apparatus comprising:means for allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; andmeans for controlling steering, switching or splitting of traffic, using one or more rules associated with the first and / or second allocated identities, to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network.

2. The apparatus as claimed in claim 1, wherein the apparatus comprises the first user equipment and the second user equipment.

3. The apparatus as claimed in claim 2, wherein the first user equipment is configured to transmit traffic steered to the first user equipment via the first access network and the second user equipment is configured to transmit traffic steered to the second user equipment via the second access network.

4. The apparatus as claimed in any preceding claim, comprising means for receiving the one or more rules associated with one or more of the first and / or second allocated identities.

5. The apparatus as claimed in claim 4, wherein the receiving means is for receiving the rules to one or more of the first and second user equipment via the respective access networks.

6. The apparatus as claimed in claim 4 or 5, wherein the one or more rules comprise one or more of the first and second allocated identities.

7. The apparatus as claimed in any preceding claim, wherein the means for controlling steering, switching or splitting of traffic is for using one or more first and second identities to determine to which one or more of the first and second user equipment the traffic is to be provided.

8. The apparatus as claimed in any preceding claim, comprising means for storing a mapping between first user equipment and the first allocated identifier and a mapping between the second user equipment and the second allocated identifier.

9. The apparatus as claimed in any preceding claim, wherein the first network access comprises a first 3GPP access and the second network access comprises a second 3GPP access.

10. The apparatus as claimed in any preceding claim, wherein the first and second subscriber identities are associated with a common subscriber profile11. The apparatus as claimed in any preceding claim, wherein the first subscriber identity is a first subscription permanent identifier SUPI and the second subscriber identity is a second subscription permanent identifier SUPI.

12. An apparatus comprising:means for allocating a first identity, said first identity being associated with a first subscriber identity and for allocating a second identity, said second identity being associated with a second subscriber identity; andmeans for controlling the steering, switching and / or splitting of traffic using one or more rules associated with the first and second identities, the traffic being sent via one or more of a first access network associated with the first subscriber identifier and a second access network associated with the second subscriber identifier.

13. The apparatus as claimed in claim 12, wherein the first subscriber identifier is associated with a first user equipment and the second subscriber identifier is associated with a second user equipment.

14. The apparatus as claimed in claim 12, wherein the apparatus comprises the first user equipment and the second user equipment.

15. The apparatus as claimed in claim 13 or 14, wherein the means for controlling the steering, switching or splitting of traffic is for steering the traffic to one or more of the first user equipment and the second user equipment based on the respective allocated first and / or second identities in the one or more rules.

16. The apparatus as claimed in claim 12, wherein the first subscriber and the second subscriber identifier are associated with one user equipment.

17. The apparatus as claimed in claim 16, wherein the apparatus comprises or is the one user equipment.

18. A method comprising:allocating a first identity to a first user equipment associated with a first subscriber identity and a second identity to a second user equipment associated with second subscriber identity, the first user equipment being associated with a first access network and the second user equipment being associated with a second access network; andcontrolling steering, switching or splitting of traffic, using one or more rules associated with the first and / or second allocated identities, to one or more of the first and second user equipment for transmitting of the traffic by the respective user equipment via the respective access network.

19. A method comprising:allocating a first identity, said first identity being associated with a first subscriber identity and for allocating a second identity, said second identity being associated with a second subscriber identity; andcontrolling the steering, switching and / or splitting of traffic using one or more rules associated with the first and second identities, the traffic being sent via one or more of a first access network associated with the first subscriber identifier and a second access network associated with the second subscriber identifier.

20. A computer program comprising computer executable instructions which when run cause the method of claim 18 or 19 to be performed.

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