JP7714733B2 - Communication control device and communication control method - Google Patents

Description

The present invention relates to a communication control device and a communication control method that controls communications between communication terminals.

When a calling terminal makes a voice call and transitions from RBT (Ringback Tone) to speech, the source of the voice packets sent by RTP (Real-time Transport Protocol) changes from the sound source device to the called terminal. At this time, the source of each voice packet independently assigns the source (SSRC: Synchronization Source), sequence number (SN), and timestamp (TS) information. The telephone gateway (GW) performs processing such as re-assigning the same SSRC value and re-assigning a continuous SN to the received voice packets (see non-patent document 1). The calling terminal references this source SSRC and sequence number SN to perform playback processing of the voice packets.

IETF RFC3550

In the above-mentioned non-patent document 1, the telephone gateway further generates a timestamp TS by adding a fixed value to the timestamp TS assigned by the sender. In recent years, specific terminals have been reproducing voice packets by referencing the timestamp TS. For example, when a specific terminal receives this voice packet, it considers it to be a continuous sequence of voice packets sent from the same device. However, if the timestamp TS is significantly different from the value of the timestamp TS of the earlier voice packet, the specific terminal will perform a process to wait for the reproduction of the later voice packet. As a result, the specific terminal will be unable to reproduce the voice, and will remain unable to make calls.

To solve the above-mentioned problems, the present invention aims to provide a communication control device and a communication control method that can avoid having to wait for audio playback at a terminal.

The communication control device of the present invention comprises a generation unit that generates a forwarded packet containing management information that has been modified so that the packet to be transmitted from a terminal is inconsistent with the management information contained in the most recent packet received immediately before the packet to be transmitted, and a transmission unit that transmits the generated forwarded packet to a terminal that is a communication partner of the terminal. The forwarded packet further contains timestamp information, and the communication partner terminal that receives the inconsistent management information processes the forwarded packet with the timestamp information reset.

This invention enables processing based on information that has been processed to be inconsistent with the most recent packet, thereby avoiding situations such as waiting for playback on the terminal.

This invention makes it possible to avoid situations such as waiting for playback on a terminal.

1 is a system configuration diagram of a communication system according to the present disclosure. FIG. 2 is a block diagram showing the functional configuration of the telephone GW 100. 10 is a flowchart showing the operation of the telephone GW 100. FIG. 1 is a diagram showing the overall sequence of a communication system. 10 is a flowchart showing the operation of the originating terminal 200. 1 is a diagram illustrating an example of a hardware configuration of a telephone GW 100 according to an embodiment of the present disclosure.

Embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, identical parts will be designated by the same reference numerals, and duplicate explanations will be omitted.

Figure 1 is a system configuration diagram of a communication system according to the present disclosure. As shown in the figure, Figure 1(a) shows the processing when a call is being made from the calling terminal 200 to the called terminal 300. Figure 1(b) shows the processing when the called terminal 300 responds to the call and starts a conversation.

As shown in FIG. 1(a), when the calling terminal 200 performs the outgoing call processing, the sound source device 400 transmits an RBT (Ringback Tone) packet P1 to the telephone GW 100 until the called terminal 300 responds to the call. This RBT packet P1 includes a source SSRC: A indicating the sound source device 400, a sequence number SN: O determined by the sound source device 400, and a timestamp TS: X according to a timer in the sound source device 400.

Then, when the telephone GW 100 receives the RBT packet P1, it generates an RBT packet P2. This RBT packet P2 includes a source SSRC:C indicating the telephone GW 100 and a sequence number SN:Q independently assigned by the telephone GW 100. The timestamp TS is x + α, which is the timestamp T:X included in the RBT packet P2 plus a predetermined value α. The telephone GW 100 generates an RBT packet P2 including this source SSRC, sequence number SN, and timestamp TS, and transmits it to the calling terminal 200.

Then, as shown in Figure 1(b), when the terminating terminal 300 responds to the call, the call begins. In Figure 1(b), after responding to the call, the terminating terminal 300 transmits voice packet P3 to the originating terminal 200. When the telephone GW 100 receives voice packet P3 indicating normal voice (not RBT) after responding to the call, it generates voice packet P4. This voice packet P4 includes Q+10000, which is obtained by adding a maximum value to the source SSRC:C indicating the telephone GW 100 and the sequence number SN:Q assigned independently by the telephone GW 100. Here, the maximum value is 10000. The timestamp TS is Y+α, which is obtained by adding α to the timestamp TS:Y of the voice packet P3.

In this way, the telephone GW 100 generates a voice packet P4 containing source SSRC: C, sequence number CN: Q+1000, and timestamp TS: Y+α, and transmits it to the originating terminal 200.

The originating terminal 200 plays back the voice packet P4 transmitted from the telephone GW 100. The originating terminal 200 receives the voice packet P4 after the RBT packet P2. At this time, the originating terminal 200 compares the RBT packet P2 with the voice packet P4. If the source SSRC:C is the same and the sequence numbers SN are consecutive, the originating terminal 200 checks the timestamp TS before performing the voice playback process. On the other hand, if the sequence numbers SN are not consecutive or there is a difference of a predetermined value or more, the originating terminal 200 performs the voice playback process without checking the timestamp TS. If the originating terminal 200 is a specific terminal that is expected in recent years, if the source SSRC:C is the same and the sequence numbers SN are consecutive, the originating terminal 200 checks the timestamp TS before performing the voice playback process. The timestamp TS uses information from the terminating terminal 300, and it is expected that recent terminals will perform such an operation to ensure continuity as voice packets. Therefore, if the timestamp TS is far into the future compared to the most recent packet, the system may be waiting for a later voice packet. In this disclosure, to resolve this voice packet waiting state, the telephone GW 100 performs specified processing on the voice packet.

The functions of the telephone GW 100, which operates in this manner, will be described in detail below. Figure 2 is a block diagram showing the functional configuration of the telephone GW 100. As shown in the figure, the telephone GW 100 is configured to include a communication unit 101, an incoming call response determination unit 102, and a packet generation unit 103.

The communication unit 101 receives packets (voice packets or RBT packets) from the receiving terminal 300 or the sound source device 400, and transmits packets based on these to the calling terminal 200. In addition, the communication unit 101 also performs reception processing of incoming call response signals.

The incoming call response determination unit 102 is a part that detects the sound source sender of a packet sent by the communication unit 101 from the receiving terminal 300, and determines that an incoming call response signal has been received if it determines that the sound source sender has changed.

The packet generation unit 103 is a part that generates packets based on packets (voice packets or RBT packets) transmitted from the terminating terminal 300 or the sound source device 400. When the communication unit 101 receives an RBT packet (including a source SSRC, sequence number SN, and timestamp TS) from the sound source device 400, the packet generation unit 103 assigns information indicating the telephone GW 100 to the source SSRC of the RBT packet to be forwarded to the originating terminal 200, and assigns an independently assigned value to the sequence number SN. The timestamp TS is the value obtained by adding a predetermined value α to the received RBT packet.

The incoming call response determination unit 102 determines that the communication unit 101 has received an incoming call response signal from the receiving terminal 300. When the communication unit 101 subsequently receives a new voice packet, the packet generation unit 103 assigns information indicating the telephone GW 100 as the source SSRC to the voice packet to be forwarded to the calling terminal 200, and assigns a sequence number SN equal to the most recently assigned sequence number plus a maximum value (e.g., 10,000). The timestamp TS is the value of the received voice packet plus a predetermined value α.

Next, we will explain the operation of the telephone GW 100 configured in this manner. Figure 3 is a flowchart showing the operation of the telephone GW 100.

The communication unit 101 receives a packet (voice packet or RBT packet) from the receiving terminal 300 (S101). Then, upon receiving the packet, the incoming call response determination unit 102 detects a change in the sound source sender from the SSRC and determines whether a change has occurred (S102). If the sound source sender has not changed (S102: NO), the packet generation unit 103 assigns a new sequence number SN or adds a predetermined value to the sequence number SN assigned to the most recently generated packet so that the SNs are consecutive (S103), and generates a new packet (RBT packet) (S105). More specifically, the packet generation unit 103 sets the source SSRC to the telephone GW 100, and assigns a new sequence number SN by the telephone GW 100, or adds a predetermined value (e.g., 1) to the sequence number SN of the most recent packet. Furthermore, the timestamp TS is set to a value based on the timestamp included in the packet (RBT packet) sent from the receiving terminal 300, and a packet containing these is generated. The packet in this case is an RBT packet, and the processes of S102 and S103 are repeated until the incoming call is responded to (i.e., the sound source is changed).

Then, the communication unit 101 transmits the RBT packet (RBT packet) to the originating terminal 200 (S106).

On the other hand, if it is determined that the sound source has changed (S102: YES), the packet generation unit 103 generates a voice packet. As described above, the packet generation unit 103 generates a packet (here, a voice packet) in which the source SSRC is set to the telephone GW 100, the sequence number SN is set to the sequence number SN used in the most recent packet generation plus the maximum value of 10,000, and the timestamp TS is set to a value (+α) based on the timestamp included in the voice packet sent from the receiving terminal 300 (S105).

Then, the communication unit 101 transmits the packet (voice packet or TBT packet) to the originating terminal 200 (S106).

Figure 4 shows the overall sequence of the communication system. The calling terminal 200 performs call processing to the called terminal 300 via the telephone gateway 100 (S201). Accordingly, the sound source device 400 transmits RBT packets to the calling terminal 200 via the telephone gateway 100 until the called terminal 300 responds to the call (S202, S203).

The telephone GW 100 generates an RBT packet P2 based on the RBT packet P1 through software (SW) processing and transmits the RBT packet P2 to the calling terminal 200. In this disclosure, since signals transmitted from each device are received in response to changes in the source of the signal, various processes other than the TS assignment process are performed through software processing.

When the receiving terminal 300 performs the call response process (S204), it transmits a call response signal to the telephone GW 100 (S205). The call response determination unit 102 of the telephone GW 100 detects a change in the sound source sender and determines whether the call response signal has been received.

Immediately thereafter, the receiving terminal 300 transmits voice packet P3 (S206). The telephone GW 100 generates voice packet P4 based on voice packet P3 and transmits it to the transmitting terminal 200 (S207). When generating voice packet P4, the telephone GW 100 sets the sequence number SN of voice packet P4 to the value obtained by adding the maximum value to the sequence number SN of RBT packet P2.

As a result, the sequence number SN of voice packet P4 is greater than the sequence number SN of the most recently received RBT packet P2, making them discontinuous, and the originating terminal 200 can perform voice playback processing without performing timestamp TS determination processing.

Now, the operation of the originating terminal 200 will be described. Figure 5 is a flowchart showing the operation of the originating terminal 200. When the originating terminal 200 receives a packet (voice packet or RBT packet), it determines whether the SSRC matches the source SSRC of the most recently received packet (S301). If it determines that there is a match, it then determines whether the sequence number SN of the received packet is contiguous with the sequence number SN of the most recently received packet (S302). If it determines that there is continuity, the originating terminal 200 then determines whether the timestamp TS is contiguous with the timestamp TS of the most recently received packet (S303). Note that in determining continuity, packet loss may be taken into account and a determination may be made that a sequence number SN is contiguous even if it skips within a predetermined value. In this disclosure, the predetermined value is 5000.

If the timestamp TS is smaller than the timestamp TS of the most recent packet, or if it is determined that the packets are consecutive, the originating terminal 200 performs audio playback processing using RTP playback (S304, S305). If the timestamp TS is smaller than that of the most recent packet, this may occur if the order in which packets were received has changed due to network delays or other reasons. In this case, the originating terminal 200 performs audio playback processing while ignoring this packet.

If the originating terminal 200 determines that the timestamp TS is greater than the timestamp TS of the most recent packet, it performs a MUTE process and waits for the playback of the subsequent voice packet (S306). A timestamp TS greater than that of the most recent packet can also occur if the order in which packets are received has changed due to network delays, etc. In this case, the difference in the timestamp TS is small and the playback wait time is short, so the caller does not recognize this as an unreachable state.

In this disclosure, after responding to an incoming call, the calling terminal 200 skips the timestamp TS determination process (S303) so that the MUTE state in step S306 does not last for a long time. Therefore, the calling terminal 200 processes the sequence number SN in the telephone GW 100 so that it determines that the sequence number SN is discontinuous (or has a predetermined difference value). In other words, the sequence number SN is processed so that the difference value from the sequence number SN of the most recently received packet is a predetermined value or more (for example, 5000 or more).

If the originating terminal 200 determines that the difference is equal to or greater than a predetermined value, the originating terminal 200 resets the timestamp TS (S307) and performs audio playback processing using RTP playback (S308). This makes it possible to avoid waiting for audio playback after answering a call. RFC3550 stipulates that the sequence number SN should be incremented by one, but if the increase is not monotonically significant, it also stipulates that packet loss should be detected and the packet sequence should be restored. The originating terminal 200 in this disclosure complies with the RFC3550 stipulations, thereby enabling audio packet playback processing when the timestamp TS is reset.

Next, the effects of the telephone GW 100 of the present disclosure will be described. This telephone GW 100 is a so-called communication control device. When this telephone GW 100 receives an incoming call response signal from the receiving terminal 300 in response to an outgoing call from the calling terminal 200, it processes the management information (sequence number SN in this disclosure) contained in the packet sent from the receiving terminal 300 into management information that is inconsistent (discontinuous in this case) with the management information (sequence number SN) contained in the most recently received packet, and generates a processed packet containing the processed management information. It also includes a packet generation unit 103 that generates a processed packet containing the processed management information, and a communication unit 101 that transmits the generated packet to the calling terminal 200.

This configuration allows the information contained in the packet to be inconsistent with the information of the most recent packet, thereby causing the originating terminal 200 to perform a specific operation. Recent communication terminals are expected to check the timestamp TS in addition to checking the sequence number SN when playing back audio. This is thought to be a specification that takes packet loss into consideration. In this case, as mentioned above, the communication terminal may have to wait for a later packet, which could result in the voice call being interrupted for an extended period of time. Therefore, when the communication terminal becomes the originating terminal 200, skipping the check of the timestamp TS can avoid voice call interruptions due to the check of the timestamp TS.

In this disclosure, the packet generation unit 103 processes the sequence number contained in the packet into a sequence number that has a predetermined difference from the sequence number contained in the most recently received packet, and generates the packet.

Specifically, the packet generation unit 103 can process a sequence number with the specified difference by adding a number equal to or greater than a specified value to the most recent sequence number.

RFC3550 stipulates that by checking the sequence number SN, the calling terminal 200 should perform a process to reset the timestamp TS, which is a so-called error process. Utilizing this can prevent call interruptions caused by waiting for audio playback due to checking the timestamp TS.

Note that while the RFC looks at the sequence number SN, it is expected that this will not be the only case in the future. This does not necessarily mean that the packet will be considered inconsistent if the other information contained in the packet is inconsistent when compared with other information in the most recent packet.

Furthermore, while the above disclosure has been described using an example of an incoming call response process, this is not limited to this, and similar processing can be applied to processes in which management information such as sequence numbers SN and timestamps TS is assigned by a device other than the source terminal.

In other words, when the packet generation unit 103 receives a response from the receiving terminal 300 to a call from the calling terminal 200, it generates a forwarding packet for the packet received after the response, and processes the packet into a forwarding sequence number SN that is consistent with the sequence number SN included in the most recently received packet until the response is received from the receiving terminal 300. However, this is not limited to this. The processing disclosed herein can also be applied when the sender is switched after the call response.

The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and/or software. Furthermore, there are no particular limitations on how each functional block is realized. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, using wires, wirelessly, etc.) and these multiple devices. A functional block may also be realized by combining software with the single device or multiple devices.

Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission functions is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

For example, the telephone GW 100 in one embodiment of the present disclosure may function as a computer that performs processing of the communication method of the present disclosure. Figure 6 is a diagram showing an example of the hardware configuration of the telephone GW 100 in one embodiment of the present disclosure. The telephone GW 100 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

In the following explanation, the term "device" can be interpreted as a circuit, device, unit, etc. The hardware configuration of the telephone GW 100 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

Each function of the telephone gateway 100 is realized by loading specific software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communications via the communication device 1004, and control at least one of reading and writing data from and to the memory 1002 and storage 1003.

The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) that includes an interface with peripheral devices, a control unit, an arithmetic unit, registers, etc. For example, the above-mentioned incoming call response determination unit 102 and packet generation unit 103 may be realized by the processor 1001.

The processor 1001 also reads programs (program code), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the incoming call response determination unit 102 and the packet generation unit 103 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks. While the above-described various processes have been described as being executed by a single processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented on one or more chips. The programs may also be transmitted from a network via a telecommunications line.

Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. Memory 1002 may also be called a register, cache, main memory (primary storage device), etc. Memory 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to one embodiment of the present disclosure.

Storage 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray® disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium that includes at least one of memory 1002 and storage 1003.

The communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, or communication module. The communication device 1004 may be configured to include a high-frequency switch, duplexer, filter, frequency synthesizer, etc. to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned communication unit 101 may be implemented by the communication device 1004. The communication unit 101 may be implemented as a physically or logically separated transmission unit and reception unit.

The input device 1005 is an input device (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

The telephone GW 100 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field-programmable gate array (FPGA), and some or all of the functional blocks may be realized by this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

The notification of information is not limited to the aspects/embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information may be performed using physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message.

Each aspect/embodiment described in this disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems enhanced based on these. Furthermore, multiple systems may be combined (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.).

The order of the procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

Specific operations described as being performed by a base station in this disclosure may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by at least one of the base station and other network nodes other than the base station (such as, but not limited to, an MME or S-GW). While the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (such as an MME and an S-GW) may also be used.

Information, etc., can be output from a higher layer (or lower layer) to a lower layer (or higher layer). It may also be input/output via multiple network nodes.

Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

Each aspect/embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of specified information (e.g., notification that "X is true") is not limited to being done explicitly, but may also be done implicitly (e.g., not notifying the specified information).

Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure, which are defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

Software, instructions, information, etc. may also be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and/or wireless technologies (such as infrared or microwave), these wired and/or wireless technologies are included within the definition of transmission media.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

As used in this disclosure, the terms "system" and "network" are used interchangeably.

Furthermore, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or other corresponding information. For example, radio resources may be indicated by an index.

The names used for the parameters above are not limiting in any way.

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching a table, database, or other data structure), and ascertaining something that is considered a "determination." Also, "determining" and "determining" may include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and other actions that are considered a "determination." Furthermore, "judgment" and "decision" can include regarding actions such as resolving, selecting, choosing, establishing, and comparing as having been "judgment" or "decision." In other words, "judgment" and "decision" can include regarding some action as having been "judgment" or "decision." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and/or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

In this disclosure, where articles are added by translation, such as a, an, and the in English, this disclosure may include the noun following these articles being plural.

In this disclosure, the term "A and B are different" may mean "A and B are different from each other." It should be noted that the term may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

101...Communication unit, 102...Incoming call response determination unit, 103...Packet generation unit.

Claims (2)

a generation unit that generates a forwarding packet including management information that has been processed so as to be inconsistent with management information included in a most recent packet received immediately before a packet to be transmitted from a terminal;
a transmitting unit that transmits the generated forwarding packet to a terminal that is a communication partner of the terminal,
The transfer packet further includes timestamp information;
In the terminal of the communication partner that has received the inconsistent management information, the communication interruption is avoided by processing the forwarded packet in which the timestamp information has been reset.
Communications control device. a generating step of generating a forwarding packet including management information processed so as to be inconsistent with management information included in a most recent packet received immediately before the packet to be transmitted from the terminal;
a transmitting step of transmitting the generated forwarding packet to a terminal that is a communication partner of the terminal;
The transfer packet further includes timestamp information;
In the terminal of the communication partner that has received the inconsistent management information, the communication interruption is avoided by processing the forwarded packet in which the timestamp information has been reset.
Communication control method.