JP6867338B2 - Inter-operator D2D operation - Google Patents

Description

Various communication systems can enjoy the benefits of inter-operator device-to-device operation. For example, 3GPP Long Term Evolution (LTE) Advanced (LTE-A) Release 12/13 (Rel-12 / 13) or future releases of communication systems will be such for D2D communications. Operation may be used.

The carrier frequency shared between the transmitter and the receiver can be a prerequisite for the communication link. For inter-operator D2D (device-to-device) communication, the transmitter and receiver are user devices (UEs) serviced by different operators within different carriers and / or bands according to traditional deployment approaches.

There are several ways to establish a D2D link on the same carrier / band for UEs serviced by different operators within different carriers and / or bands. Such methods that support the establishment of D2D links can be useful in supporting inter-operator D2D operations, both in terms of discovery and communication.

One possible approach is for the two operators to share carriers and / or bandwidth for inter-operator D2D communication. However, there may be spectral regulatory policies in cellular communications that prevent multiple operators from sharing carriers and / or bandwidth for a particular service.

Another option is for the UE to roam from one operator's network (NW) to another operator's NW to perform D2D. After UE roaming, the inter-operator D2D operates in a similar or similar manner to the intra-operator D2D. This option has traditionally not been possible with current operator-to-operator roaming agreements. In addition, this option forces the UE to roam to another operator's NW, even if the UE is within its own serving operator's coverage. If the roaming rules were changed and the UE could roam autonomously to support D2D, the following consequences could occur.

First, users may incur high roaming charges. Users may be reluctant to accept such roaming charges solely for D2D communication. Second, there may be an uncontrolled load on the roaming operator, i.e., the operator whose resources may be used by the roaming D2D device. In other words, the roaming operator must manage the cellular links and traffic of the roaming UE. This is an additional uncontrollable burden for the roaming operator.

The above two consequences are partially resolvable when roaming is done under the supervision of two operators, although the UE is not allowed to roam freely just because of D2D. In this case, a special roaming fee can be applied and the operators can agree on a fair share of the load.

However, such cooperation between operators cannot address the fact that disconnecting the serving operator from the network and connecting to the roaming target network can affect the E-UTRAN service. 3GPP Technical Specifications (TS) 22,278, No. 7A. Section 1 states that "the impact of ProSe on the E-UTRAN service should be minimized." 3GPPTS 22,278 are incorporated herein by reference in their entirety. Therefore, these approaches may not be consistent with 3GPPTS 22,278.

According to certain embodiments, the method can include, in a network element operated by an operator, a step of creating radio resource information relating to one or more operators other than the operator. The method can also include the step of broadcasting radio resource information by a network element. This radio resource information is used by a user device serviced by a network element to discover D2D (between devices) and / or communicate with another user device serviced by at least one of one or more operators. Can be configured to be able to carry out.

In certain embodiments, the method can include creating a discovery information message that can be used for D2D (device-to-device) communication in the user equipment. Discovery can be a process independent of communication. A D2D communication link setup does not always exist after the discovery of D2D. The method can also include the step of broadcasting the discovery information message by the user equipment. The discovery information message may include discovery information related to the intra-operator D2D (device-to-device) operation and discovery information related to the inter-operator D2D (device-to-device) operation.

According to certain embodiments, the method can include monitoring the user equipment for discovery information messages available for D2D (device-to-device) communication. The method can include initiating D2D (device-to-device) communication based on the discovery information message. This monitoring step can be restricted to exclude discovery messages for inter-operator D2D (device-to-device) communication, or both inter-operator D2D (device-to-device) and intra-operator D2D (device-to-device) operations. It can include a step of monitoring for discovery messages about.

In certain embodiments, a non-transitory computer-readable medium can be encoded by instructions that perform the process when executed in hardware.

According to certain embodiments, a computer program product can encode instructions to carry out a process. This process is obtained by any of the methods described above.

In certain embodiments, the device can include at least one processor and at least one memory containing computer program code. At least one memory and computer program code uses at least one processor to create radio resource information related to one or more operators other than the operator in the device, at least in the network elements operated by the operator. Can be configured to allow. At least one memory and computer program code may also be configured to use at least one processor to cause the device to broadcast radio resource information, at least by network elements. The radio resource information is that a user device serviced by a network element discovers D2D (between devices) and / or communicates with another user device serviced by at least one of one or more operators. Can be configured to be able to carry out.

According to certain embodiments, the device can include at least one processor and at least one memory containing computer program code. At least one memory and computer program code is configured to use at least one processor to force the device to create a discovery information message that is available for D2D (device-to-device) communication, at least in the user equipment. Can be done. At least one memory and computer program code may also be configured to use at least one processor to cause the device to broadcast a discovery information message, at least by a user device. The discovery information message can include discovery information that may be related to the intra-operator D2D (device-to-device) operation and discovery information that is related to the inter-operator D2D (device-to-device) operation.

In certain embodiments, the device can include at least one processor and at least one memory containing computer program code. At least one memory and computer program code is configured to use at least one processor to cause the device to monitor at least discovery information messages that can be used by user equipment for D2D (device-to-device) communication. obtain. At least one memory and computer program code may be configured to use at least one processor to cause the device to initiate D2D (device-to-device) communication based on at least a discovery information message. The monitoring step can be restricted to exclude discovery messages for inter-operator D2D (device-to-device) communication, or for both inter-operator D2D (device-to-device) and intra-operator D2D (device-to-device) operations. It can include a step of monitoring for discovery messages.

According to certain embodiments, the device can include means for creating radio resource information relating to one or more operators other than the operator in the network element operated by the operator. The device can also include means for broadcasting radio resource information by means of network elements. Radio resource information is discovered by a user device serviced by a network element and / or D2D (device-to-device) communication with another user device serviced by at least one of one or more operators. It can be configured to be feasible.

In certain embodiments, the device can include means for creating a discovery information message that can be used for D2D (device-to-device) communication in the user equipment. The device can also include means for broadcasting the discovery information message by the user equipment. The discovery information message can include discovery information related to the intra-operator D2D (device-to-device) operation and discovery information related to the inter-operator D2D (device-to-device) operation.

According to certain embodiments, the device can include means for the user equipment to monitor discovery information messages that may be used for D2D (device-to-device) communication. The device may also include means for initiating D2D (device-to-device) communication based on the discovery information message. The monitoring step can be restricted to exclude discovery messages for inter-operator D2D (device-to-device) communication, or for both inter-operator D2D (device-to-device) and intra-operator D2D (device-to-device) operations. It can include a step of monitoring for discovery messages.

In order to properly understand the present invention, the accompanying drawings should be referred to.

Illustrate resource allocation for a D2D (between device) discovery message according to an embodiment. An example of a system architecture according to an embodiment. The method and signal flow according to an embodiment will be illustrated. An example of a method according to an embodiment. Illustrate another method according to one embodiment. A further method according to an embodiment is illustrated. An example of a system according to an embodiment.

Certain embodiments may involve proximity service (ProSe) / D2D (device-to-device) discovery and communication. More specifically, one embodiment is directed to how a user device (UE) can be serviced by a different operator and still perform D2D discovery and communication.

In certain embodiments, the operator's network (NW) elements include a terrestrial public land mobile network (PLMN) identifier (id) and a frequency band (single) / carrier for which the operator supports inter-operator D2D operations. Can broadcast radio resource information related to different operators. Not all operators can support inter-operator D2D operations. Therefore, such information can be useful in inter-operator D2D discovery and communication.

In certain embodiments, there may be two types of discovery messages in the discovery signal that the UE can select. One discovery message type can store information about both intra-operator and inter-operator D2Ds or, where applicable, other scenarios such as partial coverage cases. This type can be called type 1. This type of discovery message may contain information elements to support the inter-operator D2D, such as UE capabilities and resource constraints. The UE capability may include information about the frequency bands supported by the UE. UE capabilities can also include information about the capabilities of UEs operating simultaneously on two or more bands.

Another discovery message type can include information for intra-operator D2D only. This type of discovery message can be referred to as a type 2 message. This type of discovery message cannot store information about inter-operator operations.

It is possible to allocate two or more types of such discovery messages within different radio resources. For example, FIG. 1 illustrates resource allocation for a D2D (inter-device) discovery message according to an embodiment. As shown in FIG. 1, from the point of view of the receiving UE, there may be separate search spaces for type 1 discovery messages and type 2 discovery messages. Each operator can broadcast information about radio resources for type 1 and type 2 signals, eg, within a system information block (SIB).

Different types of discovery messages can share the same radio resources as well. Sharing can be complete in the sense that the radio resources used for Type 1 and Type 2 messages have exactly the same size but the information content of the messages is different. In this case, Type 1 and Type 2 messages are distinguished by different encodings or different reference symbols. It is believed that different encodings may include different code rates, different information bit scrambling or different periodic redundancy check (CRC) bit scrambling.

Resource sharing also means that a type 1 message can consist of two parts, the first part is identical to type 2 and the second part stores information related only to inter-operator discovery. , Can be partial. Detection of complete Type 1 messages is believed to be done using a two-step procedure. That is, it is considered that in the first stage, the message portion with the type 2 content is decoded, and in the second stage, the portion related to the inter-operator discovery transmitted separately is decoded. Some information from the first part can provide linking between the second part and the first part. Linking can be based on the radio resource in such a way that the radio resource used for the first part tells from which resource the decoding of the second part should be attempted. Linking can also be based on the content of the first part. As an example, an identity within the first part or a portion of the bit carrying the identity can be repeated within the second part. As another example, after decoding the first part, the identity in the first part or some of the bits that carry the identity are used to scramble the second part or its CRC bits. The second part can be decoded and the decoding can be successful in only one second part. The benefit of transmitting inter-operator discovery related information separately can optimize resource usage when some UEs, such as those in early standard releases, only recognize Type 2 messages. It will be possible. This is because in the absence of two-part transmission, late standard release UEs that support type 1 messages will have two, i.e. once for the early release UE and once for intercarrier quick-view, type 2. This is because it is necessary to transmit the content.

If the UE attempts to discover on another operator's bandwidth, the UE may discover / detect only discovery message type 1. In contrast, if the UE makes a discovery on the bandwidth of its serving operator, the UE can discover / detect both types of discovery messages, i.e. both type 1 and type 2.

FIG. 2 illustrates a system architecture according to an embodiment. As shown in FIG. 2, a UE in connected mode, such as UE1, is cellular to the UE with a serving operator of the UE, such as Operator 1, while switching to another operator's band for inter-operator D2D operation.・ You can keep the link. A cellular link to operator 1 may be provided via eNB 1. Similarly, the UE 2 can have a cellular link to the operator 2 provided by the eNB 2. The UE 2 can communicate with the UE 1 on the D2D link roamed by the operator 2 from the perspective of the UE 1.

For time division multiplexing (TDM) type switching for inter-operator D2D operations, the serving eNB may include inter-operator D2D, such as which subframes (SF) are available for inter-operator D2D. You can set UE-specific resource constraints for. The UE can insert such resource constraint information in its discovery message.

For D2D communication, the UE can be scheduled by its D2D pair UE. In the example in FIG. 2, UE1 may be scheduled by UE2, or more precisely by eNB2, in relation to the D2D link. In other words, the particular time-frequency radio resource used can follow the scheduling decision from the D2D pair UE. This is equally applicable to other scenarios. For example, in the case of partial coverage, UEs from NW coverage may be scheduled by coverage UEs that have more information about the use of cellular resources to reduce potential interference with cellular operations.

The scheduled UE can report the resource constraints of the UE configured by the serving eNB to the D2D pair UE at the beginning of establishing the D2D communication link.

Thus, in certain embodiments, only the D2D communication link of UE1 can be switched to the NW of the other operator, and the cellular link can always be kept within the NW of the home operator of the UE.

In certain embodiments, for inter-operator discovery, the UE can send discovery signals only on its home operator's NW. Thus, in certain embodiments, the UE can completely avoid sending any discovery signal over the NW and band of any other operator. This avoidance of transmitting over the network and bandwidth of another operator can avoid any regulatory and / or billing issues between different operators. At this time, the UE can switch to another operator's band to discover or detect the UE's discovery signal of the other operator, or if supported, the UE will perform cellular operations and D2D discovery. Two connections can be maintained for both. For power efficient discovery, avoid situations where the UE spends a lot of time searching for potential discovery signals over the bandwidth of other operators to support inter-operator D2D. May be good. For example, discovery resources can be pre-defined or configured, or can inform each other between operators. Such information may be delivered to the D2D enabled UE in the form of unicast, multicast or broadcast.

FIG. 3 illustrates a method and signal flow according to an embodiment. As shown in FIG. 3, at 310, each NW (eg, eNB1 and eNB2) can configure a particular radio resource for inter-operator discovery. A UE supporting the inter-operator D2D (eg, UE1) sends a discovery signal on the configured resource at 330. In addition, each operator can broadcast such radio resource information at 320, eg, within the SIB. Then, optionally at 340, another UE (eg, UE2) can initiate D2D communication with UE1. D2D communication may not always be performed after D2D is discovered.

When the UE (eg UE2) initiates inter-operator D2D discovery, the UE first synchronizes with another operator's NW (eg eNB1), listens to the broadcast message (eg SIB), and then discovers. Information about a particular radio resource can be found to search for signals.

When making a discovery on another operator's band, the UE can discover / detect only on the radio resource to which the discovery signal supporting the inter-operator is assigned.

Inter-operator D2D communication can relate to UE capabilities such as the ability of the UE to support different bands. The eNB may set constraints on the available resources for the inter-operator D2D to minimize the impact of the inter-operator D2D service on the cellular link or for other reasons. The UE can insert such UE capability information into its D2D discovery message to allow the discovering UE to obtain such information for D2D UE pairing. Thus, in more detail, the UE can insert its own UE capability information and resource constraints for the inter-operator D2D operation in the discovery message it sends.

Such UE capability and resource constraint information may not be needed for intra-operator D2D discovery. Thus, there can be at least two types of D2D discovery messages. That is, there are an intra-operator discovery type that does not store operator-related information and an inter-operator discovery type that stores UE intra-operator and resource constraint information.

The UE can avoid sending both types of discovery messages at the same time. Thus, the UE can choose between type 1 and type 2 messages, as described above. These two types of discovery messages can be allocated within different radio resources, as shown in one embodiment in FIG. Each operator can broadcast such radio resource information using, for example, SIB.

As noted above, if the UE attempts to discover on another operator's bandwidth, the UE may discover / detect only discovery message type 1. On the other hand, the UE can discover / detect both types of discovery messages, both type 1 and type 2, when making discoveries on the bandwidth of its serving operator.

Thus, for example, the discovering UE does not consider whether another UE is being serviced by that UE network or roaming to that UE's network for D2D purposes. Other UEs can be treated equally for the purpose.

For intra-operator discovery, the UE can simply ignore information related to UE capabilities and resource constraints. The UE can follow some default rules to make decisions about what type of message to send. For example, a UE can send this kind of discovery signal on a given resource if it has the capabilities to support the inter-operator D2D. Otherwise, the UE can simply send a discovery signal for intra-operator discovery. Alternatively, the function of whether to allow the inter-operator D2D may be, for example, a user-configurable operation in the operating system settings menu of the user equipment and / or approval from the operator.

If the discovering UE finds a suitable D2D target UE, the UE can report to its serving eNB. Once the two UEs are paired, the two operators can receive reports from the same UE pair. At this time, both UEs can receive the information of their respective home / serving operators and can proceed to the communication stage, for example, as discussed below.

For inter-operator D2D communication, one potential scenario is that the D2D link is controlled by one operator's NW and D2D communication can take place within the same operator's bandwidth. Nevertheless, the cellular link can still connect each of the UEs to the NW of its respective home operator. One embodiment is shown in FIG. 2, where the D2D link of UE1 switches to the NW / band of another operator while the cellular link of UE1 is still within its home operator. There is.

Thus, the D2D-switched UE can be scheduled by its D2D pair UE for D2D communication. One embodiment is shown in FIG. 2, in which UE1 is scheduled by UE2. However, the UE 2 can still be scheduled by the operator 2's eNB 2. The advantage of this arrangement may be that UE1 does not need to build a cellular link to eNB2 just to obtain scheduling information.

In certain embodiments, the D2D link may be under the control of the operator operating the eNB and bandwidth. In this way, the impact of ProSe on the E-UTRAN service can be minimized. The available resources used for D2D may have some constraints, for example, only some SFs are available for D2D.

According to the first aspect, one embodiment may insert a resource constraint in the discovery message. The serving eNB can notify the UE of such UE-specific resource constraints for the inter-operator D2D. The UE can insert such information in the discovery message. Thus, resource constraint information can be acquired by the discovering UE, which can then be useful for proper inter-operator UE pairing. When the operator manages the inter-operator D2D link, it follows the resource constraints obtained in the discovery message.

According to the second aspect, certain embodiments can include the step of reporting resource constraints using D2D links. Once the two D2D UEs have been paired, the eNB will indicate a resource constraint on the D2D UE. The D2D link is switched and the D2D UE can report or convey this constraint to its paired D2D UE at the beginning of the D2D link establishment.

FIG. 4 illustrates a method according to an embodiment. At 410, the method can include creating radio resource information relating to one or more other operators in a network element operated by one operator. At 420, this method can include the step of broadcasting radio resource information by a network element. The radio resource information allows a user device serviced by a network element to perform D2D (device-to-device) communication with another user device serviced by at least one of one or more operators. It is configured as follows.

The radio resource information can include the terrestrial public mobile network identifier of one or more operators and / or at least one operating frequency band of one or more operators.

The method can also include setting user device specific resource constraints for inter-operator D2D (device-to-device) communication at 430. The method can further include at 440 scheduling D2D (device-to-device) communication for a user equipment pair that includes one user equipment with different operators for cellular services.

FIG. 5 illustrates another method for some implementations. The method, at 510, can include the step of creating a discovery information message in the user equipment, optionally for D2D (device-to-device) communication. This method, as well as the step of broadcasting the discovery information message by the user equipment at 520, may also be included. The discovery information message can include discovery information related to intra-operator D2D (device-to-device) communication.

The discovery information message may also include discovery information related to inter-operator D2D (device-to-device) communication. For example, the discovery information message can be a type 1 message as described above.

Alternatively, the discovery information message can exclude discovery information related to inter-operator D2D (device-to-device) communication. For example, the discovery information message can be of the type described above.

The discovery information message can also include user equipment capabilities and resource constraint information. This information may be provided by the user equipment based on instructions received from a base station such as eNodeB.

The discovery information message can be transmitted within the allocated radio resource, where the allocated radio resource is selected depending on whether it contains intra-operator D2D (device-to-device) communication information.

The method further includes at 530 reporting its resource constraints to this other user device while initiating the establishment of a D2D (device-to-device) communication link with that other user device. Can be done.

The method can additionally include in 540 a step of scheduling D2D (device-to-device) communication for this other user device while performing D2D (device-to-device) communication with another user device. ..

FIG. 6 illustrates a further method according to an embodiment. As shown in FIG. 6, the method may include at 610 the step of monitoring the discovery information message regarding D2D (device-to-device) communication by the user equipment. The method can also include at 620 the step of initiating D2D (device-to-device) communication based on the discovery information message.

The method can also include, at 605, limiting the monitoring step to exclude discovery messages for inter-operator D2D (device-to-device) communication. For example, this method can include the step of monitoring only type 2 messages. Alternatively, the method can include at 607 monitoring for discovery messages for both inter-operator D2D (device-to-device) communication and intra-operator D2D (device-to-device) communication. For example, this method can include monitoring steps for both type 1 and type 2. The monitoring step can include searching for allocated radio resources depending on whether intra-operator D2D (device-to-device) communication information is desired by the user equipment. Thus, for example, if only type 2 messages are of interest, the search may be limited to a portion of the search space.

The method can also include at 630 the step of maintaining a cellular link with the serving operator of the user equipment while switching to another operator's band for inter-operator D2D operation.

The method further includes at 640 reporting its own resource constraints to this other user device while initiating the establishment of a D2D (device-to-device) communication link with that other user device. Can be done.

FIG. 7 illustrates a system according to an embodiment of the present invention. In one embodiment, the system may include multiple devices, such as a first network element 710, a first user device 720, a second network element 730 and a second user device 740. The system may include three or more user devices 720, 740 and three or more network elements 710, 730, one for each of which is illustrated for illustration purposes. Each of these devices may include at least one processor labeled as 714, 724, 734 and 744, respectively. At least one memory may be provided within each device and is labeled as 715, 725, 735 and 745, respectively. The memory may contain computer program instructions or computer code stored therein. One or more transmitters / receivers 716, 726, 736 and 746 may be provided, and each device may also include antennas exemplified as 717, 727, 737 and 747, respectively. Although only one antenna is shown for each, it is also possible to have many antennas and multiple antenna elements for each device. For example, other configurations of these devices may be provided. For example, the first network element 710, the first user device 720, the second network element 730, and the second user device 740 can be additionally configured for wired communication. In such a case, the antennas 717, 727, 737 and 747 are not limited to the antennas, and any form of communication hardware can be exemplified. For example, antennas 717, 727, 737 and 747 can exemplify any form of wired communication hardware such as a network interface card.

Transmitters 716, 726, 736, and 746 are each independently a transmitter, receiver or unit or device that can be configured for both transmitter and receiver, or both transmission and reception. obtain.

Processors 714, 724, 734 and 744 can be embodied by any computational or data processing device such as a central processing unit (CPU), application specific integrated circuit (ASIC), or comparable device. The processor can be implemented as a single controller or multiple controllers or processors.

The memories 715, 725, 735 and 745 can independently be any suitable storage device, such as a non-transient computer-readable medium. Hard disk drives (HDD), random access memory (RAM), flash memory or other suitable memory can be used. The memory can be combined as a processor on a single integrated circuit, or it can be separate. In addition, computer program instructions can be stored in memory and processed by the processor in any suitable form (CPC), eg, a compilation written in any suitable programming language. It can be a computer program that has been or translated.

Memory and computer program instructions use a processor for a particular device to provide hardware devices such as first network element 710, first user equipment 720, second network element 730 and second user equipment 740. Can be configured to perform any of the processes described above (see, eg, FIGS. 3-6). Thus, in certain embodiments, non-transitory computer-readable media may be encoded by computer instructions capable of performing a process, such as one of the processes described herein, when executed in hardware. Alternatively, it is possible to carry out certain embodiments of the invention entirely in hardware.

Further, FIG. 7 illustrates a system including a first network element 710, a first user device 720, a second network element 730 and a second user device 740, although embodiments of the present invention illustrate. It may also be applicable to other configurations and configurations involving additional elements as exemplified and discussed herein (see, eg, FIGS. 1-3).

Certain embodiments may have various advantages and / or advantages. For example, for inter-operator discovery, one embodiment may not involve any transmission over the NW or bandwidth of another operator. In addition, certain embodiments provide efficient discovery procedures. For inter-operator communication, some embodiments do not require switching cellular links to NWs and bands / carriers of other operators.

Those skilled in the art will readily appreciate that the invention as described above can be practiced by steps in a different order than those disclosed and / or using hardware elements of different configurations. Is. Thus, although the invention has been described on the basis of these preferred embodiments, those skilled in the art will readily understand some modifications, modifications and alternative structures while remaining within the spirit and scope of the invention. It seems clear that it can be done. Therefore, the accompanying claims should be referred to in order to determine the boundaries of the invention.

Claims (27)

Steps to prepare the discovery information message on the user device,
A method including a step of broadcasting the discovery information message by the user device.
The discovery information message includes discovery information related to the intra-operator D2D (device-to-device) operation and discovery information related to the inter-operator D2D (device-to-device) operation.
The inter-operator D2D (between devices) operation for D2D (between devices) operation, between the serving operator that the switching said user equipment in the band of another operator, cellular to the serving operator Including that the user device keeps the link,
Method. The method of claim 1, wherein the discovery information message includes user equipment capabilities and resource constraint information. The discovery information message is transmitted within the allocated radio resource and
The allocated radio resource is selected depending on whether the discovery information message contains information about the inter-operator D2D (device-to-device) operation.
The method according to claim 1 or 2. The step 1 or 2, wherein the resource constraint of the user is reported to the other user device while the establishment of the D2D (device-to-device) communication link with the other user device is started. Method. The method according to claim 1 or 2, wherein the D2D (device-to-device) communication for the other user device is scheduled while the D2D (device-to-device) communication with the other user device is being performed. The step of communicating with another user device by the inter-operator D2D (device-to-device) operation while the user device and the other user device} maintain their respective cellular links with one of their serving operators. The method according to claim 1, further comprising. With the step of preparing another discovery information message including the discovery information related to the intra-operator D2D (inter-device) operation without including the discovery information related to the inter-operator D2D (inter-device) operation in the user equipment. ,
The other discovery from the user device to the discovery information message containing discovery information related to the inter-operator D2D (inter-device) operation and discovery information related to the intra-operator D2D (inter-device) operation on different radio resources. Steps to broadcast informational messages and
The method according to claim 1 or 6. A step of detecting a discovery information message broadcast from a second user device having a cellular link to a first serving operator in a first user device having a cellular link to the first serving operator. It's a way to include
The discovery information message includes discovery information related to the intra-operator D2D (device-to-device) operation and discovery information related to the inter-operator D2D (device-to-device) operation.
The inter-operator D2D (between devices) operation for D2D (between devices) operations, while the first user equipment in the band of another operator is switching from the serving operator, to the serving operator Including that the first user device keeps the cellular link of
Method. The step of communicating with the second user device by the inter-operator D2D (device-to-device) operation while the first and second user devices maintain their respective cellular links with their serving operator. 8. The method of claim 8. A claim that further comprises a step of identifying a second operator as a network supporting inter-operator D2D (inter-device) operation from the information broadcast by the first serving operator in the first user device. 8. The method of claim 9. Having a cellular link from the message broadcast from the second operator to the second operator to broadcast a discovery information message related to the inter-operator D2D (device-to-device) operation-Radio resources of the user equipment 10. The method of claim 10, further comprising the step of identifying. In the first search space, a step of searching for discovery information messages including discovery information related to inter-operator D2D (inter-device) operation and discovery information related to intra-operator D2D (inter-device) operation.
A discovery that includes discovery information related to the intra-operator D2D (inter-device) operation without including discovery information about the inter-operator D2D (inter-device) operation in a second search space separate from the first search space. 8. The method of claim 8 or 9, further comprising searching for an informational message. A device comprising at least one processor and at least one memory containing computer program code.
The at least one memory and the computer program code are stored in the device at least by using the at least one processor.
It is configured to prepare a discovery information message and broadcast the discovery information message.
The discovery information message includes discovery information related to the intra-operator D2D (inter-device) operation and discovery information discovery information related to the inter-operator D2D (inter-device) operation.
The inter-operator D2D (device-to-device) operation is a cellular link to the serving operator while the device switches to a band of an operator different from the serving operator for the D2D (device-to-device) operation. Including that the device keeps
apparatus. The device of claim 13 , wherein the discovery information message includes user equipment capabilities and resource constraint information. The discovery information message is transmitted within the allocated radio resource and
13. The allocated radio resource is selected according to claim 13 or 14 , depending on whether the discovery information message contains information about the inter-operator D2D (device-to-device) operation. Equipment. The at least one memory and the computer program code have initiated the establishment of a D2D (device-to-device) communication link with the device at least with the other user equipment using at least one processor. The device according to claim 13 or 14 , which is configured to cause the other user device to report its own resource constraints in the meantime. The at least one memory and the computer program code are said to be different while the device is in at least D2D (device-to-device) communication with another user device using at least one processor. The device according to claim 13 or 14 , wherein the D2D (device-to-device) communication with respect to the user equipment of the above is configured to be scheduled. The at least one memory and the computer program code are cellular to the device using at least one processor, at least the device and the other user equipment with each of the operators servicing them. 13. The device of claim 13, configured to communicate with another user device by the inter-operator D2D (device-to-device) operation while maintaining the link. The at least one memory and the computer program code will use at least one processor and the device will contain at least the discovery information associated with the inter-operator D2D (device-to-device) operation. Prepare another discovery information message that contains discovery information related to operator D2D (device-to-device) operations.
Broadcast the other discovery information message to the discovery information message containing discovery information related to the inter-operator D2D (inter-device) operation and discovery information related to the intra-operator D2D (inter-device) operation on different radio resources. 13. The device of claim 13 or 18. A device comprising at least one processor and at least one memory containing computer program code.
The at least one memory and the computer program code are stored in the device at least by using the at least one processor.
It is configured to detect discovery information messages broadcast from another user device that has a cellular link to a different serving operator.
The discovery information message includes discovery information related to the intra-operator D2D (device-to-device) operation and discovery information related to the inter-operator D2D (device-to-device) operation.
The inter-operator D2D (device-to-device) operation is a cellular link to the serving operator while the device switches to a band of an operator different from the serving operator for the D2D (device-to-device) operation. Including that the device keeps
apparatus. The at least one memory and the computer program code are at least one processor, the apparatus, at least the apparatus and the other user equipment, each cellular link with their serving operator. 20. The device of claim 20, configured to communicate with the other user equipment by the inter-operator D2D (device-to-device) operation while maintaining. The at least one memory and the computer program code are stored in the device at least by using the at least one processor.
The device according to claim 20 or 21 , which is configured to identify the second operator as a network supporting inter-operator D2D (inter-device) operation from information broadcast from the first operator. .. The at least one memory and the computer program code are inter-operator D2D (device-to-device) operations from at least a message broadcast from the second operator to the device using at least one processor. 22. The apparatus of claim 22, which has a cellular link to said second operator to broadcast a discovery information message relating to the device, configured to identify the radio resource of the user equipment. The at least one memory and the computer program code are found information related to the inter-operator D2D (device-to-device) operation in the device, at least in the first search space, using at least one processor. And search for discovery information messages that include discovery information related to intra-operator D2D (device-to-device) operations.
In a second search space separate from the first search space, discovery information related to the intra-operator D2D (inter-device) operation without including discovery information related to the inter-operator D2D (inter-device) operation. The device according to claim 20 or 21 , which is configured to search for a discovery information message including. A device comprising means for detecting a discovery information message broadcast from another user device having a cellular link to a different serving operator.
The discovery information message includes discovery information related to the intra-operator D2D (device-to-device) operation and discovery information related to the inter-operator D2D (device-to-device) operation.
The inter-operator D2D (device-to-device) operation is a cellular link to the serving operator while the device switches to a band of an operator different from the serving operator for the D2D (device-to-device) operation. Including that the device keeps
apparatus. When executed in hardware, it claims 1 to non-transitory computer readable medium encoded with instructions to perform a process comprising a method according to any one of 12. It claims 1 to computer program comprising instructions for performing a process including a method according to any one of 12.

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