Communication devices, systems and methods

Abstract

To provide a communication device, a system, a method and a program that can improve the degree of freedom in allocating radio resources to physical channels.SOLUTION: A communication device 1 determines an accommodation status of sessions in radio resources of a first physical channel out of the first physical channel and a second physical channel of the communication device 1. The communication device 1 instructs to change some of the radio resources of the first physical channel to radio resources of the second physical channel according to the above-described accommodation status.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates generally to mobile communication networks. [Background technology]

[0002] LTE Evolved Multimedia Broadcast Multicast Service (eMBMS) is a technology that uses Long Term Evolution (LTE) technology to simultaneously distribute data to an unspecified number of users (e.g., Non-Patent Documents 1 and 2). For example, in a situation where a large number of users gather in one place, such as a concert or a sporting event, a base station can use eMBMS to efficiently utilize the base station's radio resources and distribute content to the users. Normally, a base station that supports eMBMS supports unicast communication, which communicates with a specific single user, in addition to multicast communication, which distributes data to an unspecified number of users. For multicast communication, radio resources assigned to a physical channel for multicast are used, and for unicast communication, radio resources assigned to a physical channel for unicast are used. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] 3GPP www.3gpp.org / ftp / Specs / archive / 36_series / 36.743, [Retrieved March 29, 2021], Internet<URL:https: / / www.3gpp.org / ftp / Specs / archive / 36_series / 36.743 / 36743-010.zip> [Non-Patent Document 2] 3GPP www.3gpp.org / ftp / Specs / archive / 36_series / 36.440, [Retrieved March 29, 2021], Internet<URL:https: / / www.3gpp.org / ftp / / Specs / archive / 36_series / 36.440 / 36440-g00.zip> Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a base station that supports eMBMS, the allocation of subframes to the multicast physical channel and the unicast physical channel is semi-fixed, and the degree of freedom in the allocation of radio resources to the physical channels is low. Note that this issue is not limited to eMBMS, but applies to multiple physical channels to which radio resources are allocated semi-fixedly.

[0005] One of the objectives of the present disclosure has been made to solve the above-mentioned problems, and is to provide a communication device, system, method, and program that can improve the freedom of allocation of radio resources to physical channels.

[0006] It should be noted that this object is merely one of the objects to be achieved by the embodiments disclosed herein. Other objects or problems and novel features will become apparent from the description of this specification or the accompanying drawings. [Means for solving the problem]

[0007] A communication device according to a first aspect of the present disclosure is a communication device that supports LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), and includes: a determination unit that determines an accommodation status of a session in radio resources of a first physical channel out of a first physical channel and a second physical channel, one of which is a physical channel for unicast and the other is a physical channel for multicast; and an allocation instruction unit that instructs an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel in accordance with the accommodation status. Equipped with:

[0008] A communication device according to a first aspect of the present disclosure is a communication device that supports LTE Evolved Multimedia Broadcast Multicast Service (eMBMS) and includes an allocation unit that allocates radio resources to each of a first physical channel and a second physical channel, and the allocation unit receives instructions from an allocation instruction unit that instructs the allocation unit to change a portion of the radio resources of the first physical channel to the radio resources of the second physical channel, and executes the contents of the instructions.

[0009] A system according to a first aspect of the present disclosure is a system supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), and includes: a determination unit that determines a session accommodation status in radio resources of a first physical channel out of a first physical channel and a second physical channel, one of which is a physical channel for unicast and the other is a physical channel for multicast; an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel; and an allocation instruction unit that instructs the allocation unit to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel in accordance with the accommodation status.

[0010] A method according to a first aspect of the present disclosure is a method of a communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), which determines a session accommodation status in radio resources of a first physical channel out of a first physical channel and a second physical channel, one of which is a physical channel for unicast and the other is a physical channel for multicast, and instructs an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel to change part of the radio resources of the first physical channel to the radio resources of the second physical channel in accordance with the accommodation status.

[0011] A method according to a first aspect of the present disclosure is a method of a communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), which allocates radio resources to each of a first physical channel and a second physical channel, receives instructions from an allocation instruction unit that instructs a communication device to change part of the radio resources of the first physical channel to the radio resources of the second physical channel, and executes the contents of the instructions. Effect of the Invention

[0012] According to the present disclosure, it is possible to provide a communication device, a system, a method, and a program that can improve the degree of freedom in allocating radio resources to physical channels. [Brief description of the drawings]

[0013] [Figure 1] 1 is an explanatory diagram for explaining an example of a communication device 1 in a first embodiment. [Diagram 2] 2 is an explanatory diagram for explaining an example of a communication device 2 in the first embodiment. FIG. [Diagram 3] 4 is a sequence diagram for explaining an example of the operation of the communication device 1 in the first embodiment. FIG. [Figure 4] FIG. 11 is an explanatory diagram for explaining an example of a communication device 3 in a second embodiment. [Diagram 5] FIG. 11 is an explanatory diagram for explaining an example of a communication device 4 in the second embodiment. [Figure 6] 10 is a flowchart illustrating an example of an operation of the communication device 3 in the second embodiment. [Figure 7] FIG. 2 is an explanatory diagram for explaining a configuration example of a communication device in each embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] In the following, specific embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and in order to simplify the description, duplicated descriptions will be omitted as necessary.

[0015] The following embodiments may be implemented independently or in appropriate combination. These embodiments have different novel features. Therefore, these embodiments contribute to solving different objects or problems and provide different effects.

[0016] <First embodiment> FIG. 1 shows a configuration example of a communication device 1 in this embodiment, and FIG. 2 shows a configuration example of a communication device 2 in this embodiment. Each element shown in FIG. 1 and FIG. 2 can be implemented, for example, as dedicated hardware, as software running on dedicated hardware, or as a virtualization function instantiated on an application platform running on general-purpose hardware. For example, the communication device 2 may be a base station supporting a communication method defined in 3GPP (Third Generation Partnership Project) such as Long Term Evolution (LTE) and New Radio (NR), or a service such as LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), and the communication device 1 may be a communication device connected to this base station. The base station is connected to a terminal device and a core network supporting, for example, LTE, NR, and eMBMS.

[0017] In FIG. 1, the communication device 1 is a communication device that supports LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), and includes a determination unit 11 and an allocation instruction unit 12.

[0018] The determination unit 11 is configured to be able to determine the accommodation status of sessions in the radio resources of the first physical channel out of the first physical channel and the second physical channel included in the communication device 2. One of the first physical channel and the second physical channel is a physical channel for unicast, and the other is a physical channel for multicast.

[0019] The allocation instruction unit 12 is configured to be able to instruct the allocation unit 13, which allocates radio resources to each of the first physical channel and the second physical channel, to change a portion of the radio resources of the first physical channel to the radio resources of the second physical channel according to the above-mentioned accommodation situation.

[0020] 2, communication device 2 is a communication device that supports LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), and includes an allocation unit 13. Communication devices 1 and 2 constitute a system that supports LTE Evolved Multimedia Broadcast Multicast Service (eMBMS).

[0021] The allocation unit 13 is configured to be able to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel based on an instruction received from the allocation instruction unit 12. Note that the above "part of the radio resources" may be a subframe and is not limited thereto.

[0022] Next, an operation example of the communication device 1 according to the first embodiment will be described with reference to Fig. 3. Fig. 3 is a sequence diagram showing an operation example of the communication device 1 according to the first embodiment.

[0023] First, the determination unit 11 determines the accommodation status of the first physical channel 200 out of the first physical channel 200 and the second physical channel 201 provided in the communication device 2 (S101).

[0024] The allocation instruction unit 12 instructs the allocation unit 13, which allocates radio resources to each of the first physical channel and the second physical channel, to change some of the radio resources of the first physical channel to the radio resources of the second physical channel depending on the capacity (S102).

[0025] As described above, the communication device 1 can change part of the radio resources allocated to the first physical channel to radio resources of the second physical channel depending on the accommodation status of the first physical channel in the communication device 2. This can improve the degree of freedom in allocation of radio resources to physical channels.

[0026] In the above description, the determination unit 11, the allocation instruction unit 12, and the allocation unit 13 are assumed to be included in different devices (i.e., the communication device 1 and the communication device 2), but the present disclosure is not limited to this. For example, the determination unit 11, the allocation instruction unit 12, and the allocation unit 13 may all be included in one communication device. This one communication device may be a base station that supports LTE, NR, or eMBMS.

[0027] In short, regardless of whether the determination unit 11 and the allocation instruction unit 12 are included in the same device or in different devices, it is sufficient that the determination unit 11 determines the session accommodation status in the radio resources of the first physical channel out of the first physical channel and the second physical channel, and the allocation instruction unit 12 instructs the allocation unit 13, which allocates radio resources to each of the first physical channel and the second physical channel, to change part of the radio resources of the first physical channel to the radio resources of the second physical channel depending on the accommodation status.

[0028] <Second embodiment> Fig. 4 shows a configuration example of a communication device 3 according to this embodiment, and Fig. 5 shows a configuration example of a communication device 4 according to this embodiment. The communication device 3 corresponds to the communication device 1 in the first embodiment, and the communication device 4 corresponds to the communication device 2 in the first embodiment.

[0029] For example, the communication device 4 may be a base station supporting a communication method defined in 3GPP (Third Generation Partnership Project), such as Long Term Evolution (LTE) or New Radio (NR), or a service such as LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), and the communication device 3 may be a communication device connected to this base station. The base station is connected to a terminal device and a core network that support, for example, LTE, NR, or eMBMS.

[0030] 4, the communication device 3 includes a determination unit 31, an allocation instruction unit 32, and a session control unit 33.

[0031] The determination unit 31 corresponds to the determination unit 11 in the first embodiment. The determination unit 31 determines "the accommodation status of sessions in the radio resources of the first physical channel" of the first physical channel and the second physical channel included in the communication device 4. Hereinafter, this determination may be referred to as "accommodation status determination." One of the first physical channel and the second physical channel is a physical channel for unicast, and the other is a physical channel for multicast.

[0032] An example of the "accommodation status of sessions in the radio resources of the first physical channel" is a situation where, even if a part of the radio resources of the first physical channel is changed to the radio resources of the second physical channel, it is not necessary to release a session that is already accommodated in the radio resources of the first physical channel and corresponds to a priority higher than a predetermined level (hereinafter, this may be referred to as a "first accommodation status"). Also, an example of the "accommodation status of sessions in the radio resources of the first physical channel" is a situation where, even if a part of the radio resources of the first physical channel is changed to the radio resources of the second physical channel, it is necessary to release a session that is already accommodated in the radio resources of the first physical channel and corresponds to a priority higher than a predetermined level (hereinafter, this may be referred to as a "second accommodation status").

[0033] Here, the determination unit 31 may execute the above-mentioned "accommodation status determination" when a predetermined condition (hereinafter, sometimes referred to as "first condition") is satisfied as a trigger. The "first condition" may include, for example, one or both of a condition that the radio resources of the second physical channel have no room to accept a new session (hereinafter, sometimes referred to as "second condition") and a condition that the amount of the radio resources of the second physical channel before the change has not reached an "upper limit value" (hereinafter, sometimes referred to as "third condition"). The upper limit value may be a value specified by 3GPP, or may be a value set by an operator of the communication device 3. Note that, when the "first condition" includes the "second condition" and the "third condition", the order in which the "second condition" and the "third condition" are determined is not particularly limited, but may be determined in the order of the "second condition" and the "third condition". Then, when both the "second condition" and the "third condition" are satisfied, the "accommodation status determination" is executed. Furthermore, the determination unit 31 may execute the determination of the "first condition" and the "accommodation status determination" using as a trigger the fact that the first physical channel is a physical channel for unicast, the second physical channel is a physical channel for multicast, and there is an access to the second physical channel of a multicast session with a high priority (for example, high urgency). Alternatively, the determination unit 31 may execute the "accommodation status determination" using as a trigger the fact that the first physical channel is a physical channel for unicast, the second physical channel is a physical channel for multicast, and there is an access to the second physical channel of a multicast session with a high priority (for example, high urgency), without using the "first condition" as a trigger. This makes it possible to guarantee communication of users with high urgency. The determination of the priority of this session may use "information identifying the session" held in the session control unit 33 described later.

[0034] The allocation instruction unit 32 corresponds to the allocation instruction unit 12 in the first embodiment. When it is determined in the above-mentioned "accommodation status determination" that the "accommodation status of the session in the radio resource of the first physical channel" is the "first accommodation status", the allocation instruction unit 32 instructs the allocation unit 41 to change a part of the radio resource of the first physical channel to the radio resource of the second physical channel. As a result, for example, the allocation of the radio resource between the first physical channel and the second physical channel is readjusted. The allocation instruction unit 32 may specify a subframe assigned to the first physical channel that is to be changed to the radio resource of the second physical channel. That is, the allocation instruction unit 32 may control to change a part of the radio resource of the first physical channel to the radio resource of the second physical channel on a subframe basis. Note that the number of subframes assigned to the first physical channel that are changed to the radio resource of the second physical channel at one opportunity may be one or more.

[0035] Here, the allocation instruction unit 32 may instruct the allocation unit 41 to periodically change some or all of the radio resources of the second physical channel that do not accommodate a session to the first physical channel. This instruction periodically reviews the allocation of radio resources to the second physical channel. This ensures the allocation of radio resources to the first physical channel.

[0036] For example, the allocation instruction unit 32 may change the subframe of the second physical channel to the first physical channel when the following formula (1) is satisfied.

[0037]

number

[0038] Here, A m is the priority of the multicast session, and B m is the number of multicast sessions, and D mis the maximum number of sessions that can be accommodated in multicast, and E m is the maximum number of sessions that can be accommodated per subframe in multicast. That is, here, as an example, the first physical channel is a physical channel for unicast, and the second physical channel is a physical channel for multicast.

[0039] When the "accommodation status determination" determines that the "accommodation status of sessions in the radio resources of the first physical channel" is the "second accommodation status," the session control unit 33 releases a session accommodated in the second physical channel and corresponding to a "priority lower than a predetermined level," and accommodates a new session in the second physical channel. The above-mentioned "priority lower than a predetermined level" is, for example, a priority lower than the priority of a session to be newly accommodated in the second physical channel. That is, the session control unit 33 may release a session in consideration of the priority of the newly accommodated session. For example, the session control unit 33 may determine the priority of a session that needs to be newly accommodated in the second physical channel, and release a session in the second physical channel that has a lower priority than the priority of the session.

[0040] Moreover, the session control unit 33 is configured to be able to store information for identifying a session accommodated in the above-mentioned second physical channel.

[0041] In FIG. 5, the communication device 4 includes an allocation unit 41. The allocation unit 41 corresponds to the allocation unit 13 in the first embodiment. The allocation unit 41 changes a part of the radio resources of the first physical channel to the radio resources of the second physical channel based on an instruction received from the allocation instruction unit 32. As described above, the instruction from the allocation instruction unit 32 may indicate a subframe assigned to the first physical channel that is to be changed to the radio resources of the second physical channel. That is, the allocation unit 41 may change a part of the radio resources of the first physical channel to the radio resources of the second physical channel on a subframe-by-subframe basis based on an instruction received from the allocation instruction unit 32.

[0042] Next, an operation example of the communication device 3 according to the second embodiment will be described with reference to Fig. 6. Fig. 6 is a flowchart showing an operation example of the communication device 3 according to the second embodiment. Here, a specific example of a case where the first physical channel is a physical channel for unicast, the second physical channel is a physical channel for multicast, and there is access to the second physical channel for a multicast session (e.g., an eMBMS session) with a high priority (e.g., high urgency) will also be described.

[0043] First, the determination unit 31 determines (S201) whether the access session to the second physical channel (i.e., the session to be processed) is of high priority based on the information for identifying the session stored in the session control unit 33. If the access session to the second physical channel is not of high priority (NO in S201), the process flow ends.

[0044] If the access session to the second physical channel has a high priority (YES in S201), the determination unit 31 determines whether or not the above-mentioned "second condition" is satisfied (S202). As described above, the "second condition" is a condition that the radio resources of the second physical channel do not have room to accept a new session. For example, the determination unit 31 may determine whether or not the above-mentioned "second condition" is satisfied based on the following equation (2).

[0045]

number

[0046] Here, A m is the priority of the multicast session, and B m is the number of multicast sessions, and D m is the maximum number of sessions that can be accommodated in multicast.

[0047] If it is determined that the "second condition" is not satisfied (NO in S202), the session control unit 33 accommodates the session to be processed in the radio resources of the second physical channel (S203).

[0048] If it is determined that the "second condition" is satisfied (YES in S202), the determination unit 31 determines whether or not the above-mentioned "third condition" is satisfied (S204). As described above, the "third condition" is a condition that the allocated amount of radio resources of the second physical channel before the change has not reached the "upper limit value". For example, the determination unit 31 may determine whether or not the above-mentioned "third condition" is satisfied based on the following equation (3).

[0049]

number

[0050] Here, C m is the maximum number of subframes for eMBMS in the multicast channel, and 6.subframe indicates that the number of subframes is 6.

[0051] If it is determined that the "third condition" is not satisfied (S204 is NO), the session control unit 33 releases the session that is accommodated in the second physical channel and that corresponds to a "priority lower than a predetermined level," and accommodates the session to be processed in the second physical channel (S205).

[0052] If it is determined that the "third condition" is satisfied (YES in S204), the determination unit 31 executes "accommodation status determination" (S206). That is, the determination unit 31 determines whether or not the "accommodation status of the session in the radio resource of the first physical channel" is the "first accommodation status." For example, the determination unit 31 may execute the "accommodation status determination" based on the following formula (4).

[0053]

number

[0054] Here, A u is the priority of the unicast session, B u (A u ) is the number of unicast sessions of the given priority, and D u is the number of unicast sessions accommodated when the number of unicast subframes is n. In other words, equation (4) means that when n subframes are currently assigned to the first physical channel and one subframe is reduced to (n-1) subframes, a high priority session can be accommodated in the (n-1) subframe.

[0055] If it is determined that the "accommodation status of the session in the radio resources of the first physical channel" is the "first accommodation status" (YES in S206), the allocation instruction unit 32 instructs the allocation unit 41 to change part of the radio resources of the first physical channel to the radio resources of the second physical channel (S207). Then, the session control unit 33 accommodates the session to be processed in the radio resources of the second physical channel.

[0056] If it is determined that the "session accommodation status in the radio resources of the first physical channel" is not the "first accommodation status", that is, is the "second accommodation status" (S206 is NO), the session control unit 33 releases the session accommodated in the second physical channel and corresponding to a "priority lower than a predetermined level", and accommodates the session to be processed in the second physical channel (S208).

[0057] As described above, the communication device 3 can change part of the radio resources allocated to the first physical channel to radio resources of the second physical channel depending on the accommodation status of the first physical channel in the communication device 4. This can improve the degree of freedom in allocation of radio resources to physical channels.

[0058] In the above description, the determination unit 31, the allocation instruction unit 32, the session control unit 33, and the allocation unit 41 are assumed to be included in different devices (i.e., the communication device 3 and the communication device 4), but the present disclosure is not limited to this. For example, the determination unit 31, the allocation instruction unit 32, the session control unit 33, and the allocation unit 41 may all be included in one communication device. This one communication device may be a base station supporting LTE, NR, or eMBMS.

[0059] In short, regardless of whether the determination unit 31, allocation instruction unit 32, and session control unit 33 are included in the same device as the allocation unit 41 or in different devices, it is sufficient that the determination unit 31 determines the session accommodation status in the radio resources of the first physical channel out of the first physical channel and the second physical channel, the allocation instruction unit 32 instructs the allocation unit 41, which allocates radio resources to each of the first physical channel and the second physical channel, to change part of the radio resources of the first physical channel to the radio resources of the second physical channel depending on the accommodation status, and the session control unit 33 can release the session depending on the accommodation status.

[0060] Here, the above-mentioned determination unit 31, allocation instruction unit 32, and session control unit 33 may be included in an RRM (Radio Resource Management) functional unit. Also, the above-mentioned allocation unit 41 may be included in an O&M (Operation and Maintenance) functional unit.

[0061] <Other embodiments> The communication devices 1, 2, 3, and 4 (hereinafter referred to as communication device 1, etc.) according to the above-described embodiments may have the following hardware configuration. Fig. 7 is a block diagram illustrating an example of the hardware configuration of a computer (information processing device) capable of realizing the communication device according to each embodiment.

[0062] 7, a communication device 1 or the like includes a network interface 100, a processor 101, and a memory 102. The network interface 100 is used to communicate with other wireless communication devices including a plurality of communication terminals. The network interface 100 may include, for example, a network interface card (NIC) that complies with the IEEE 802.11 series, the IEEE 802.3 series, or the like.

[0063] The processor 101 reads out and executes software (computer programs) from the memory 102 to perform the processes of the communication device 1 and the like described using the flowcharts and sequence diagrams in the above-mentioned embodiments. The processor 101 may be, for example, a microprocessor, an MPU (Micro Processing Unit), or a CPU (Central Processing Unit). The processor 101 may include multiple processors.

[0064] The memory 102 is configured by a combination of volatile memory and non-volatile memory. The memory 102 may include storage located remotely from the processor 101. In this case, the processor 101 may access the memory 102 via an I / O interface (not shown).

[0065] 7, the memory 102 is used to store software modules. The processor 101 reads these software modules from the memory 102 and executes them to implement the communication device described in the above embodiment. 1 Processing such as the above can be performed.

[0066] As described with reference to FIG. 7, each of the processors included in the communication device 1 etc. executes one or more programs including a set of instructions for causing a computer to execute the algorithm described with reference to the drawing.

[0067] In the above example, the program can be stored and provided to the computer using various types of non-transitory computer readable media. The non-transitory computer readable media includes various types of tangible storage media. Examples of the non-transitory computer readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives) and magneto-optical recording media (e.g., magneto-optical disks). Further, examples of the non-transitory computer readable media include CD-ROM (Read Only Memory), CD-R, and CD-R / W. Further, examples of the non-transitory computer readable media include semiconductor memory. The semiconductor memory includes, for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, and RAM (Random Access Memory). The program may also be provided to the computer by various types of transitory computer readable media. Examples of the transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire or an optical fiber, or via a wireless communication path.

[0068] The present disclosure is not limited to the above-described embodiment, and may be modified as appropriate without departing from the spirit and scope of the present disclosure. In addition, the present disclosure may be implemented by appropriately combining the respective embodiments.

[0069] For example, some or all of the above embodiments may be described as, but are not limited to, the following supplementary notes. (Appendix 1) A communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), a determination unit that determines an accommodation status of a session in radio resources of a first physical channel out of a first physical channel and a second physical channel, one of which is a unicast physical channel and the other of which is a multicast physical channel; an allocation instruction unit that instructs an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel according to the accommodation situation; A communication device comprising: (Appendix 2) when the accommodation status indicates a status in which a session that is already accommodated in the radio resources of the first physical channel and corresponds to a priority higher than a predetermined level does not need to be released even if a part of the radio resources of the first physical channel is changed to the radio resources of the second physical channel, the allocation instruction unit instructs the allocation unit to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel. 2. The communication device of claim 1. (Appendix 3) a session control unit configured to release a session that is already accommodated in the radio resources of the second physical channel and that corresponds to a priority level lower than a predetermined level, and to accommodate a new session to be accommodated in the radio resources of the second physical channel in the radio resources of the second physical channel, when the accommodation status indicates a status in which a session that is already accommodated in the radio resources of the first physical channel and that corresponds to a priority level higher than a predetermined level needs to be released when a part of the radio resources of the first physical channel is changed to the radio resources of the second physical channel. 3. The communication device according to claim 1 or 2. (Appendix 4) The priority level lower than the predetermined level is lower than the priority level of a new session to be accommodated on the second physical channel. 4. The communication device of claim 3. (Appendix 5) The determination unit, the allocation instruction unit, and the session control unit Radio Resource Management ( RRM) It is included in the functional section, The allocation unit, Operation and Maintenance ( O&M ) Included in the functional section are 5. The communication device according to claim 3 or 4. (Appendix 6) The determination unit further determines whether a first condition is satisfied, and determines the accommodation status when the first condition is satisfied; The first condition includes a second condition that the radio resources of the second physical channel are not sufficient to accommodate a new session. 6. A communication device according to any one of claims 3 to 5. (Appendix 7) The first condition is that an amount of radio resources allocated to the second physical channel before the change has not reached an upper limit value, and a third condition is further included. 7. The communications device of claim 6. (Appendix 8) the determination unit determines whether the second condition is satisfied, and if it is determined that the second condition is satisfied, determines whether the third condition is satisfied, and if it is determined that the third condition is satisfied, determines the accommodation status. 8. The communication device of claim 7. (Appendix 9) the session control unit stores information for identifying a session to be accommodated in the second physical channel; the determination unit determines whether or not to determine the first condition based on information identifying the session. 9. A communication device according to any one of appendix 6 to 8. (Appendix 10) 10. The communication device according to claim 9, wherein the information for identifying the session is information for identifying an urgency of the session. (Appendix 11) the allocation instruction unit performs control so as to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel on a subframe basis. 11. A communication device according to any one of claims 1 to 10. (Appendix 12) 12. The communication device according to claim 1, wherein the allocation instruction unit periodically controls the allocation unit to change some or all of the radio resources of the second physical channel that do not accommodate a session to the radio resources of the first physical channel. (Appendix 13) the first physical channel is a physical channel for unicast; The second physical channel is a physical channel for multicast. 13. A communication device according to any one of claims 1 to 12. (Appendix 14) A communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), An allocation unit that allocates radio resources to each of a first physical channel and a second physical channel, the allocation unit receives an instruction from an allocation instruction unit to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel, and executes the instruction. Communications equipment. (Appendix 15) A system supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), a determination unit that determines an accommodation status of a session in radio resources of a first physical channel out of a first physical channel and a second physical channel, one of which is a unicast physical channel and the other of which is a multicast physical channel; an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel; an allocation instruction unit that instructs the allocation unit to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel according to the accommodation status; A system comprising: (Appendix 16) A method for a communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), comprising: determining an accommodation status of a session in a radio resource of a first physical channel out of a first physical channel and a second physical channel, one of which is a unicast physical channel and the other of which is a multicast physical channel; instructing an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel according to the accommodation status. method. (Appendix 17) A method for a communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), comprising: Allocating radio resources to each of the first physical channel and the second physical channel; receiving an instruction from an allocation instruction unit for instructing to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel; Execute the contents of said instructions; method. (Appendix 18) A program for a communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), determining an accommodation status of a session in a radio resource of a first physical channel out of a first physical channel and a second physical channel, one of which is a unicast physical channel and the other of which is a multicast physical channel; instructing an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel according to the accommodation status. program. (Appendix 19) A program for a communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), Allocating radio resources to each of the first physical channel and the second physical channel; receiving an instruction from an allocation instruction unit for instructing to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel; Execute the contents of said instructions; program. [Explanation of symbols]

[0070] 1. Communications equipment 2. Communications equipment 3. Communications equipment 4. Communications equipment 11 Judgment section 12 Allocation instruction section 13 Allocation Section 31 Judgment section 32 Allocation instruction section 33 Session Control Section 41 Allocation Section 100 Network Interfaces 101 Processor 102 Memory 200 1st Physical Channel 201 Second Physical Channel

Claims

1. A communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), a determination unit that determines an accommodation status of a session in radio resources of a first physical channel out of a first physical channel and a second physical channel, one of which is a unicast physical channel and the other of which is a multicast physical channel; an allocation instruction unit that instructs an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel according to the accommodation status; A communication device comprising:

2. When the accommodation status indicates a status in which a session that is already accommodated in the radio resources of the first physical channel and corresponds to a priority higher than a predetermined level does not need to be released even if a part of the radio resources of the first physical channel is changed to the radio resources of the second physical channel, the allocation instruction unit instructs the allocation unit to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel. The communication device according to claim 1 .

3. a session control unit configured to release a session that is already accommodated in the radio resources of the second physical channel and that corresponds to a priority level lower than a predetermined level, and to accommodate a new session to be accommodated in the radio resources of the second physical channel in the radio resources of the second physical channel, when the accommodation status indicates a status in which a session that is already accommodated in the radio resources of the first physical channel and that corresponds to a priority level higher than a predetermined level needs to be released when a part of the radio resources of the first physical channel is changed to the radio resources of the second physical channel.

3. A communication device according to claim 1 or 2.

4. the priority level lower than the predetermined level is lower than the priority level of a new session to be accommodated on the second physical channel; The communication device according to claim 3.

5. the determination unit, the allocation instruction unit, and the session control unit are included in a Radio Resource Management (RRM) functional unit, The allocation unit is included in an Operation and Maintenance (O&M) function unit.

5. A communication device according to claim 3 or 4.

6. The determination unit further determines whether a first condition is satisfied, and determines the accommodation status when the first condition is satisfied; the first condition includes a second condition that the radio resources of the second physical channel are not sufficient to accommodate a new session; A communication device according to any one of claims 3 to 5.

7. A system supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), comprising: a determination unit that determines an accommodation status of a session in radio resources of a first physical channel out of a first physical channel and a second physical channel, one of which is a unicast physical channel and the other of which is a multicast physical channel; an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel; an allocation instruction unit that instructs the allocation unit to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel according to the accommodation status; A system comprising:

8. A method for a communication device supporting LTE Evolved Multimedia Broadcast Multicast Service (eMBMS), comprising: determining an accommodation status of a session in a radio resource of a first physical channel out of a first physical channel and a second physical channel, one of which is a unicast physical channel and the other of which is a multicast physical channel; instructing an allocation unit that allocates radio resources to each of the first physical channel and the second physical channel to change a part of the radio resources of the first physical channel to the radio resources of the second physical channel according to the accommodation status. method.

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