KR102034160B1 - Method and apparatus for identifying communication links, and method of communication - Google Patents

Abstract

According to an embodiment of the present invention, a communication method of a third device for controlling a first link directly formed between a first device and a second device is provided. The third device assigns a first link identifier that identifies the first link. The third device transmits first information including the first link identifier to the first device and the second device. And the third device receives second information including allocation acceptance information indicating whether to accept the allocation of the first link identifier from the first device and the second device.

Description

METHOD AND APPARATUS FOR IDENTIFYING COMMUNICATION LINKS, AND METHOD OF COMMUNICATION}

The present invention relates to a communication method and a method and apparatus for identifying a communication link.

A communication link is required for a communication device to communicate with another communication device. If a plurality of communication devices are mixed, there may be a plurality of communication links, and various methods are used to distinguish the plurality of communication links. In the case of a cellular network, there is only a communication link between the base station (or repeater) and the terminal, so that the identifier of the terminal is used for communication link identification. In the case of a mesh (MESH) or ad hoc (AD-HOC) network, each communication device communicates with a plurality of adjacent communication devices, so that identifiers of the transmitting device and the receiving device are used for communication link identification. Recently, the cellular network standard (IEEE 802.16.1a) provides a direct communication function between terminals. Separate addresses of a transmitting terminal and a receiving terminal are used for link identification in direct communication, but are limited to direct communication between terminals in the same cell.

Meanwhile, the link identification information may be included in the control information or data information. Therefore, in order to reduce the overhead caused by link identification information, it is necessary to identify many links with link identification information having a minimum size.

On the other hand, if the identifier of the terminal is used directly for link identification may cause privacy and security issues. Therefore, another separate identification scheme for link identification is needed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for allocating, changing, and releasing communication link identification information, and a method for using communication link identification information in communication.

According to one embodiment of the present invention, there is provided a communication method of a third device for controlling a first link formed directly between a first device and a second device. The communication method may comprise: allocating a first link identifier identifying the first link; Transmitting first information including the first link identifier to the first device and the second device; And receiving second information from the first device and the second device, the second information including allocation acceptance information indicating whether to accept the allocation of the first link identifier.

The third apparatus may be any one of a base station and a repeater.

The transmitting of the first information comprises: a first device indicator identifying the first device on the first link and a second device indicator identifying the second device on the first link; Include in the step.

The communication method may include allocating a second link identifier identifying a second link directly formed between the first device and a fourth device; And transmitting third information including the second link identifier to the first device and the fourth device. And wherein transmitting the third information includes including the first device indicator in the third information to identify the first device on the second link.

The transmitting of the first information may further include including link information about the first link and period information about a period during which the first link identifier is available, in the first information.

The second information may further include link information about the first link and period information about a period during which the first link identifier may be used.

The communication method may determine that the first link is not received even when the second information is received or when the allocation acceptance information of the second information indicates the rejection of the allocation of the first link identifier. Assigning a second link identifier to identify; And when the second link identifier is allocated, transmitting third information including the second link identifier to the first device and the second device.

The communication method may further include transmitting, to the first device and the second device, third information for changing at least one of the allocated first link identifier and the period in which the allocated first link identifier is available. It may further include.

The communication method may further include transmitting third information for releasing the assigned first link identifier to the first device and the second device.

In addition, according to another embodiment of the present invention, there is provided a communication method of a second terminal forming a first link for direct communication with the first terminal. The communication method includes receiving first information from the base station, the first information including a first link identifier assigned by the base station; And transmitting second information including allocation acceptance information indicating whether to accept the allocation of the first link identifier to the base station. Wherein the first link identifier is a link identifier identifying the first link.

In addition, according to another embodiment of the present invention, a method is provided in which a first terminal identifies a first link directly formed between itself and a second terminal. The link identification method may include requesting transmission of at least one first link identifier assigned to the third terminal to at least one third terminal adjacent to the third terminal; Receiving the first link identifier from the third terminal; Assigning a second link identifier different from the first link identifier to identify the first link; Transmitting first information including the second link identifier to the first terminal; And receiving, from the first terminal, second information including allocation acceptance information indicating whether to accept the allocation of the second link identifier.

In addition, according to another embodiment of the present invention, there is provided a communication method of a base station for controlling N communication links formed directly between a first terminal and N (where N is a natural number) second terminals. The communication method includes transmitting a first message to the first terminal, the first message including N link identifiers identifying the N communication links; And receiving, from the first terminal, a second message including N allocation acceptance information indicating whether to accept the allocation of the N link identifiers.

According to an embodiment of the present invention, each communication link can be effectively identified even when a plurality of communication links exist.

In addition, according to the embodiment of the present invention, since a separate link identifier is used instead of the identifier of the terminal, privacy and security problems in the prior art can be prevented.

In addition, according to an embodiment of the present invention, since a large number of links can be identified using link identification information having a minimum size, overhead due to the link identification information can be minimized.

1 is a flowchart illustrating a process of dynamically allocating link identification information between devices forming a link according to an embodiment of the present invention.
2 is a flowchart illustrating a process of dynamically allocating link identification information by a tenth apparatus (eg, a base station) according to an embodiment of the present invention.
3 is a flowchart illustrating a process of dynamically changing link identification information by a tenth apparatus (eg, a base station) according to an embodiment of the present invention.
4 is a flowchart illustrating a process of dynamically releasing link identification information by a tenth apparatus (eg, a base station) according to an embodiment of the present invention.
5 is a diagram illustrating a configuration of a communication device according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, a terminal includes a mobile station (MS), a mobile terminal (MT), an advanced mobile station (AMS), a high reliability mobile station (HR-MS). ), A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE), or the like. It may include all or part of the functionality of AMS, HR-MS, SS, PSS, AT, UE, and the like.

In addition, the base station (BS) may be an advanced base station (ABS), a high reliability base station (HR-BS), a node B (node B), an advanced node B (evolved node B, eNodeB), access point (AP), radio access station (RAS), base transceiver station (BTS), mobile multihop relay (MMR) -BS, relay serving as a base station station, RS), a high reliability relay (HR-RS) serving as a base station, etc., and may also refer to ABS, Node B, eNodeB, AP, RAS, BTS, MMR-BS, RS, HR. It may include all or part of functions such as -RS.

A communication device (hereinafter referred to as a device) may form a communication link (hereinafter referred to as a link) with another device. A device in a cellular network or infrastructure network refers to a base station, repeater or terminal. Through a link formed by any two devices, one device can transmit a signal to another device. For example, assuming that a link is formed between a first device (eg, a terminal) and a second device (eg, a terminal), when the first device wants to transmit control information or data to the second device, the first The device and the second device may transmit / receive control information necessary for communication. The information necessary for communication may be generated by the first device and the second device and exchanged directly between the two devices. In the case where a third device (eg, a base station) can manage (or control) the communication between the first device and the second device, the information required for communication can be generated by the third device, which is then associated with the first device. It can be provided to the second device. The information necessary for communication may include synchronization related information, resource allocation related information, link adaptation related information (eg, modulation order, code rate), power control related information, and multiple-input multiple-output (MIMO). ) May be transmission control related information. Meanwhile, the first device may form a link with each of a plurality of devices (eg, terminals) other than the second device and transmit the same signal to the plurality of devices other than the second device by transmitting the same signal to the second device.

One device may form a link with each of a plurality of devices (eg, terminals), and communication may be simultaneously performed on a plurality of adjacent links. For example, at the same time, the first device transmits a signal to the second device, the fourth device (e.g., the terminal) transmits a signal to the fifth device (e.g., the terminal), and the sixth device (e.g., the terminal) The signal may be transmitted to the fifth device, and the second device may transmit a signal to the seventh device (eg, a terminal). As such, in a communication network, a link including the device itself and a link including the device itself may be mixed, and a plurality of links including the device itself may be present. Thus, each device must be able to identify each link in transmission or control.

The link may be identified using a specific identifier that is conventionally used for communication or using a separate link identifier.

1. If the link is identified without using a separate link identifier:

The device identifier of the device making up the link may be used for link identification. The device identifier may be a MAC address, a station ID, and a node ID. The device may identify the link using the device identifier of the device making up the link.

In addition, a flow identifier (FID, Flow ID) or a connection identifier (CID, Connection ID) may be used for link identification. In addition, when the FID or CID has no directionality for the uplink / downlink as in a cellular network or an infrastructure network, a combination of the FID and the uplink / downlink indicator (hereinafter referred to as the FID combination) or Links may be identified using a combination of a CID and an uplink / downlink indicator (hereinafter, referred to as a CID combination).

Before the separate link identifier is used or the separate link identifier is allocated, the link may be identified using the above-described device identifier, FID, or CID. Specifically, in transmitting a message including related information for managing or controlling a link (hereinafter referred to as a link control message), a device identifier, a FID, a CID, a FID combination, or a CID combination may be used to indicate a corresponding link. have. That is, the link control message may include a device identifier, an FID, a CID, an FID combination, or a CID combination to indicate a corresponding link when the link control message is transmitted. If the control target is a plurality of links, the link control message may include a plurality of device identifiers, FIDs, CIDs, FID combinations, or CID combinations to indicate each link. On the other hand, when a source device (eg, a source terminal) and a destination device (eg, a destination terminal) use different FIDs or CIDs in a cellular or infrastructure network, a link transmitted to each device Each control message may include a FID, a CID, a FID combination, or a CID combination corresponding to each device.

In the IEEE 802.16n standard, when a link is created for direct communication between two devices (eg, two terminals), the base station transmits a DC-LC-REQ message to the two terminals to request a link generation between the two terminals and responds thereto. Each of the two terminals transmits a DC-LC-RSP message. Here, the DC-LC-REQ message and / or the DC-LC-RSP message may include the CID of each terminal corresponding to the target link. If there are a plurality of target links, the DC-LC-REQ message and / or the DC-LC-RSP message may include the CID of each terminal corresponding to each of the plurality of links.

Meanwhile, the DC-LC-REQ message may have a format as shown in Table 1 below.

Format of DC-LC-REQ Message Syntax Bits Remarks Management Message Type 8 119 N-DC-LINK 2 Number of DC links Reserved 6 for (i = 0; i <N-DC-LINK; i ++) { CID assigned for transmitting 16 CID assigned for receiving
} 16

As shown in Table 1, the DC-LC-REQ message has a message type (Management Message Type, set to 119), the number of direct communication links (N-DC-Link), and the number of transmitting CIDs (for transmission). Assigned CID), and as many CIDs as received (the CID assigned for reception).

Meanwhile, the DC-LC-RSP message may have a format as shown in Table 2 below.

DC-LC-RSP Message Format Syntax Bits Remarks Management Message Type 8 120 N-DC-LINK 2 Number of DC links Reserved 6 for (i = 0; i <N-DC-LINK; i ++) { CID assigned to DC Link 16 CID assigned for transmission Confirmation Code One 0x00: Accept
0x01: Reject Reserved
} 7

As shown in Table 2, the DC-LC-RSP message is allocated as the message type (Management Message Type, set to 120), the number of direct communication links (N-DC-Link), and the number of transmitting CIDs (for transmission). CID), and a confirmation code as many as the number of direct communication links. The confirmation code in Table 2 is information indicating acceptance or rejection of the link generation request, and is set to 0x00 when the terminal accepts the link generation request of the base station, and the terminal selects the link generation request of the base station. If rejected, it is set to 0x01.

Meanwhile, in the IEEE 802.16.1a standard, when creating a link for direct communication between two terminals, the base station transmits an AAI-DC-LC-REQ message to the two terminals to request the creation of a link between the two terminals. The terminal transmits an AAI-DC-LC-RSP message. Here, the AAI-DC-LC-REQ message and / or the AAI-DC-LC-RSP message may include a combination of the FID and uplink / downlink indicator of each terminal corresponding to the target link. If there are a plurality of target links, the AAI-DC-LC-REQ message and / or the AAI-DC-LC-RSP message may include a combination of the FID and the uplink / downlink indicator of each terminal corresponding to each of the plurality of links. It may include.

2. If the link is identified using a separate link identifier:

The link can be identified by assigning the link a separate link identifier (a parameter for link identification) that is not a device identifier, an FID or a CID. Thus, the device may have a link identifier corresponding to each single link or each link combination (combination consisting of multiple links). Here, a multicast group may be formed through a plurality of links of one device. The link identifier according to the embodiment of the present invention has a different identification scheme from the above-described device identifier. The link identifier may correspond to not only a single link but also multiple links that make up a link group. Therefore, the link identifier may correspond to the device identifier of the device constituting the link corresponding to the link identifier. The link identifier may be unique in a group (eg, network, subnetwork, cell, sector) that the device configures. On the other hand, when each device is distinguishable by a group (eg, a network, a subnetwork, a cell or a sector), each device belonging to a different group may use the same link identifier. For example, when the first device and the second device form the first link in the first cell, and the third device and the fourth device form the second link in the second cell, the first link and the second link. Each may be assigned the same link identifier (eg, link identifier 1). On the other hand, even if each device is divided into groups (eg, networks, sub-networks, cells, sectors), if the two devices forming the link belong to different groups, each device configuring the link must use the same link identifier. . For example, when the first device of the first cell and the second device of the second cell form the first link, the first device and the second device have the same link identifier (eg, link identifier) for the first link. You must use 1).

On the other hand, in the case of identifying a link using the above-described link identifier, it is necessary to distinguish the devices configuring the link. As described above, a device may use a link identifier to identify at least one link, and device identification is required to control or transmit at least one link. A device indicator may be used to distinguish each device constituting the link corresponding to the link identifier. Specifically, the device may have a device indicator for each link identifier. Therefore, the device indicators of the devices configuring each link corresponding to the same link identifier may have uniqueness. Device indicators of devices constituting each link corresponding to different link identifiers may be used in duplicate. For example, the first device and the second device form a first link and are assigned a link identifier 1 for the first link, and the second device and the fourth device form a second link and a link identifier for the second link. 2, the first device is assigned device indicator 1 for link identifier 1, the fourth device is assigned device indicator 1 for link identifier 2, and the second device is assigned to both link identifier 1 and link identifier 2; Device indicator 0 can be assigned. The combination of the link identifier and the device indicator may refer to at least one link and the devices that make up the link. Meanwhile, the device indicator may refer to any one of a transmitting device and a receiving device, and may refer to a link direction. Specifically, when the device indicator refers to a transmitting device, the device (e.g., the first device) corresponding to the particular device indicator (e.g., device indicator 1) transmits and the link identifier (e.g., link identifier) of the device indicator 1 The link direction (direction from the first device to the second device) can be inferred by considering that the counterpart device (eg, the second device) in the link to which the first device belongs among the links corresponding to 2) receives. . Conversely, if the device indicator refers to a receiving device, the device (e.g., third device) corresponding to the device indicator (e.g., device indicator 2) is receiving and the link identifier (e.g., link identifier 3) of device indicator 2 is received. The link direction (direction from the fourth device to the third device) can be inferred by considering that the counterpart device (eg, the fourth device) on the link to which the third device belongs among the links corresponding to the transmission.

Link identification information for identifying a link may be configured as follows.

If the separate link identifier is not used (eg, before the separate link identifier is allocated), the link identification information may be configured as a device identifier of each device constituting the link. On the other hand, the link identification information may be composed of a specific identifier assigned to each device constituting the link. For example, the link identification information may be configured with a two-way direct communication (TWDC) address of the IEEE 802.16.1a standard, and may be configured with a CID of the IEEE 802.16n standard. Meanwhile, in the case of using a separate link identifier, the link identification information may be composed of a link identifier and a device indicator.

Link identification information may be assigned statically or dynamically.

1. If link identification information is statically assigned:

A link identifier may be fixedly assigned to each link between the device (eg, the first device) and all devices that may be the communication targets of the first device. The first device may have device information constituting each link and link identification information corresponding to each link for all links. Here, the device information may include a device indicator.

2. If link identification information is dynamically assigned:

Link identification information may be dynamically assigned by a single or multiple devices. Link identification information may be allocated when a corresponding link is generated. The assigned link identification information may be released by a single or multiple devices in the event of disconnection, link disconnection, or an event that satisfies a predetermined condition. Given a maintenance / expiration period for link identification information, the assigned link identification information may be released after being maintained for the maintenance period (or released after being maintained until the expiration period). Meanwhile, the maintenance / expiration period may be renewed (or changed) before the maintenance / expiration period expires, and the maintenance / expiration period may be renewed upon request. The link identification information maintenance / expiration period (hereinafter referred to as a maintenance period) may be predetermined or determined together with the assignment of the link identification information. The retention period may be changed (replaced or accumulated) with a change in the link identification information. Meanwhile, even if the link identification information is dynamically allocated, the assigned link identification information may not be changed and released. In this case, the link identification information may be considered to be statically allocated. That is, the dynamic allocation of link identification information may be performed with static allocation without changing and releasing the link identification information.

1 is a flowchart illustrating a process of dynamically allocating link identification information between devices forming a link according to an embodiment of the present invention. 1 illustrates a process of allocating link identification information for identifying a first link formed between a first device and a second device for convenience of description.

The first device requests transmission of link identification information to a neighboring device adjacent to the first device to obtain link identification information (that is, link identification information already assigned to the neighboring device) previously assigned (S110).

The neighboring device, which has been requested to transmit, transmits link identification information assigned thereto to the first device. The first device receives link identification information already assigned to the neighboring device from the neighboring device (S120).

The first device may allocate a link identifier (link identifier 4) other than the link identifier (eg, link identifier 1, link identifier 2, link identifier 3) of the link identification information received from the neighboring device for the first link. . In more detail, the first device requests allocation of link identification information including a link identifier 4 to a second device that is a counterpart device constituting the first link (S130). Upon receiving the allocation request, the second device may respond with an acceptance or rejection to the allocation of the received link identification information. The first device receives response information about the allocation of the link identification information from the second device (S140). When the first device receives an acknowledgment of the assignment of the link identification information from the second device, the first device determines that the link identification information including the link identifier 4 has been successfully allocated.

On the other hand, when the first device wants to change or release the allocated link identification information, the second device may request to change or release the assigned link identification information. The requested second device may respond with an acceptance or rejection to change or release of the link identification information. The first device determines that the link identification information has been successfully changed or released when the second device receives acceptance of the change or release request from the second device.

Meanwhile, the link identification information may be allocated, changed, or released by the tenth device rather than the device (eg, the first device and the second device) forming the first link. Here, the tenth apparatus may be a base station, a relay that performs a role of a base station, or a network equipment.

2 is a flowchart illustrating a process of dynamically allocating link identification information by a tenth apparatus according to an embodiment of the present invention. In FIG. 2, for convenience of description, a process of allocating link identification information for identifying a first link formed between a first device and a second device is a base station.

The base station transmits link identification information allocation information (hereinafter, referred to as allocation information) for allocating link identification information to the first and second devices to which the link identification information is assigned (S210). On the other hand, when link identification information is allocated together with link generation, link identification information may be included in link generation related information including link generation request information. The allocation information may include link identification information, target link information (eg, link information about the first link), and maintenance / expiration period information (hereinafter, referred to as maintenance period information) of the link identification information. The target link information may include the above-described FID, CID, FID combination, or CID combination. On the other hand, when the first device wants to create a link also with a device other than the second device (for example, the third device) or already forms a link, the base station simultaneously transmits a plurality of different allocation information to the first device. send. In this case, the allocation information includes link identification information allocation number (e.g., two), link identification information as many as link identification information allocation number, target link information as link identification information allocation number and holding period information as link identification information allocation number. It may include.

The device (eg, the first device and the second device) assigned with the link identification information receives the allocation information from the base station. The first device and the second device that receive the allocation information may use the received link identification information for the target link (that is, the first link) by using the received target link information and link identification information. The first device and the second device transmit link identification information allocation response information (hereinafter, assigned response information) to the base station in response to the reception of the allocation information (S220). On the other hand, in the case of responding to the link identification information allocation together in the link generation response, the assignment response information may be included in the link generation related information including the link assignment response information. The assignment response information may include target link information (eg, link information about the first link), assignment acceptance information indicating whether to accept the link identification information, and maintenance period information. On the other hand, when the first device wants to create a link also with a device other than the second device (for example, the third device) or already forms a link, the first device simultaneously transmits a plurality of different allocation response information to the base station. Can be sent. In this case, the allocation response information includes the number of responses to the allocation of the link identification information (hereinafter, referred to as the allocation response number), the target link information as many as the allocation response, the allocation acceptance information as the allocation response number, and the holding period information as the allocation response number. It may include. On the other hand, when the first device responds together with the link identification information allocation in the link generation response, the allocation response number may be replaced with the link generation response number.

On the other hand, when the device (eg, the first device or the second device) that has received the assignment information accepts the assignment of the received link identification information, the assignment acceptance information indicates that the assignment is made, and the received link identification information is allocated. In case of rejecting the information, whether to accept the assignment information indicates the rejection. The device (eg, the first device and the second device) that has received the allocation information may include the holding period information in the allocation response information when the allocation acceptance information is set to the acceptance. Meanwhile, the device (eg, the first device) that has received the allocation information may use the received link identification information (eg, the link identifier 1) for another link (eg, the second link formed between the first device and the fourth device). In use, the allocation of the received link identification information can be rejected. The device that has refused the assignment acceptance information does not use the link identification information received for the link (eg, the first link). On the other hand, the device (eg, the first device) that rejects the assignment acceptance information may include the scheduled time information for retrying allocation in the allocation response information. In this way, the first apparatus may induce the base station to retry the allocation of the link identification information after a predetermined time. On the other hand, when the device (eg, the first device or the second device) that has received the allocation information cannot form the corresponding link (eg, the first link), the device (eg, the first device) may reject the allocation of the received link identification information.

The base station receives assignment response information from the first and second devices. With respect to any link identification information transmitted by the base station (eg, link identifier 1 for identifying the first link), the base station receives all of the allocation response information from the first and second devices (S230). If the assignment acceptance information indicates acceptance (S240), it is determined that allocation of the link identification information (eg, link identifier 1 for identifying the first link) is successful (S250). On the other hand, with respect to any link identification information (for example, link identifier 1 for identifying the first link) transmitted by the base station, the base station does not receive allocation response information from the first and second devices (S230), or the allocation response. Even if the information is received, the base station reassigns the link identification information to the first and second devices using different link identification information (for example, link identifier 2) if the received information indicating whether to accept the allocation response information is rejected. Try (S260).

3 is a flowchart illustrating a process of dynamically changing link identification information by a tenth apparatus according to an embodiment of the present invention. In FIG. 3, for convenience of description, a process of changing a link identification information allocated for a first link formed between a first device and a second device as a base station is illustrated.

The base station transmits link identification information change information (hereinafter, referred to as change information) to change the link identification information to the first and second devices that have been previously assigned link identification information (eg, link identifier 1 identifying the first link). (S310). The change information may include pre-change link identification information (eg, link identifier 1), post-change link identification information (eg, link identifier 2), and target link information (eg, link information about the first link). On the other hand, when the change target is the maintenance period information, the change information may further include the maintenance period information after the change. On the other hand, when the first device also forms a link with a device other than the second device (for example, the third device), the base station can transmit a plurality of different change information to the first device at the same time. In this case, the change information includes link identification information change number, link identification information change number before change link identification information, link identification information change number change amount, and link identification information change amount and link identification information change amount change number. can do. On the other hand, when the change target is the sustain period information, the change information may further include post-change sustain period information by the number of link identification information changes.

The first and second devices receive change information from the base station. The device (e.g., the first device and the second device) that has received the change information includes the link identification information before the change (e.g., link identifier 1), the link identification information (e.g., link identifier 2) after the change, and the target link information (e.g., The link identification information of the corresponding link (eg, the first link) may be changed (eg, changed from link identifier 1 to link identifier 2) by using link information about the first link. In addition, the device (eg, the first device, the second device) that has received the change information may have the link identification information (eg, link identifier 1) before the change, the target link information (eg, link information about the first link), and the change after the change. The maintenance period information of the corresponding link (eg, the first link) may be changed (replaced or accumulated) using the retention period information.

The device (eg, the first device and the second device) receiving the change information transmits link identification information change response information (hereinafter referred to as change response information) to the base station in response to the reception of the change information (S320). On the other hand, when responding to the change in the link identification information in the link change response, the change response information may be included in the link change-related information including the link change response information. The change response information may include target link information (eg, link information about the first link), pre-change link identification information (eg, link identifier 1), post-change link identification information (eg, link identifier 2), and change of link identification information. It may include change acceptance information indicating whether or not to accept. On the other hand, when the first device also forms a link with a device other than the second device (for example, the third device), the first device can simultaneously transmit a plurality of different change response information to the base station. In this case, the change response information includes the number of responses to the change of the link identification information (hereinafter referred to as the change response number), the target link information by the change response number, the link identification information before the change by the change response number, and the change by the change response number. It may include post link identification information and change acceptance information as much as the number of change responses.

Meanwhile, the device (eg, the first device) receiving the change information may use the received link identification information (eg, the link identifier 2) for another link (eg, the second link formed between the first device and the fourth device). When in use, it rejects the change of the received link identification information. The device (e.g., the first device and the second device) that has received the change information does not change the link identification information (e.g., the link identifier) or the sustain period information when rejecting the change of the received link identification information.

The base station receives the change response information from the first and second devices. When the base station receives all the change response information from the first and the second device with respect to any change information transmitted by the base station (S330), and the change acceptance information of the received change response information indicates acceptance (S340). In operation S350, it is determined that the change of the link identification information (for example, the change from the link identifier 1 to the link identifier 2) or the change of the maintenance period information (for example, the change from the first period to the second period) is successful (S350). On the other hand, with respect to any change information transmitted by the base station, the base station does not receive the change response information from the first and the second device (S330), or even if the change response information receives the change acceptance information of the received change response information Indicates that the rejection is performed (S340), the base station may retry to change the link identification information by using different link identification information (eg, link identifier 3) to the first and second devices. Similarly, if the base station does not succeed in changing the holding period information, the base station may retry changing the holding period information to the first and second devices.

4 is a flowchart illustrating a process of releasing link identification information dynamically by a tenth apparatus according to an embodiment of the present invention. 4 illustrates a process of releasing link identification information allocated for a first link formed between a first device and a second device as a base station for convenience of description.

The base station transmits link identification information release information (hereinafter referred to as release information) to the first and second devices to release link identification information (eg, link identifier 1) allocated to the first and second devices (S410). . Meanwhile, when link identification information is released together with the link release, the release information may be included in the link release related information including the link release request information. The release information may include release target link identification information (eg, link identifier 1) and target link information (eg, link information about the first link). On the other hand, when the first device also forms a link with a device other than the second device (for example, the third device), the base station can simultaneously transmit a plurality of different release information to the first device. In this case, the release information may include the release identification link identification information as many as the link identification information release number, the release identification link identification information as many as the link identification information release number, and the target link information as many as the release number of the link identification information.

The first and second devices receive release information from the base station. The device (eg, the first device and the second device) receiving the release information may release the link identification information (eg, link identifier 1) of the corresponding link (eg, the first link). The device (eg, the first device and the second device) receiving the release information transmits link identification information release response information (hereinafter referred to as release response information) to the base station in response to the reception of the release information (S420). Meanwhile, when the link release response responds to the release of the link identification information, the release response information may be included in the link release related information including the link release response information. The release response information may include release linkage information (eg, link information about the first link), release target linkage identification information (eg, link identifier 1), and release acceptance information indicating whether acceptance of release of the linkage identification information is allowed. Can be. On the other hand, when the first device also forms a link with a device other than the second device (eg, the third device), the first device can simultaneously transmit a plurality of different release response information to the base station. In this case, the release response information includes the number of responses to the release of the link identification information (hereinafter referred to as the release response number), the target link information as many as the release response, the release target link identification information as the release response number, and the release response number as the release response number. It may include acceptance information. On the other hand, when the first device responds to the release of the link identification information in the link release response, the release response number may be replaced by the link release response number.

The device (e.g., the first device) that has received the release information causes the release acceptance information to indicate acceptance when accepting the release of the received link identification information, and releases when rejecting the release of the received link identification information. Allow acceptance information to indicate rejection. The device (eg, the first device) that rejects the release of the received link identification information does not release the link identification information (eg, link identifier 1) for the corresponding link (eg, the first link).

The base station receives the release response information from the first and second devices. If the base station receives all release response information from the first and second devices with respect to any release information transmitted by the base station (S430), and the release acceptance information of the received release response information indicates acceptance (S440). In operation S450, it is determined that the release of the link identification information (eg, the link identifier 1 for the first link) is successful. On the other hand, with respect to any release information transmitted by the base station, the base station does not receive the release response information from the first and second devices (S430) or even if receiving the release response information release acceptance information of the received release response information If (S440) indicates that the rejection, the base station can retry to release the link identification information to the first and second devices (S460).

Meanwhile, the release of the link identification information may be performed together with the release of the link by the base station.

On the other hand, the base station may determine whether to release the link by using the state information of the link corresponding to the link identification information. The base station is a device (e.g., a first device, a second device) constituting a link (e.g., a first link) with status information of a link (e.g., a first link) corresponding to link identification information (e.g., link identifier 1) Can be received from. The devices (e.g., the first device and the second device) constituting the link (e.g., the first link) corresponding to the specific link identification information (e.g., link identifier 1) are state information of the link (e.g., the first link). May be transmitted to the base station. Here, the link state information may include whether transmission / reception is possible on the link, channel state information and channel quality information of the link.

On the other hand, when two devices constituting the link (eg, the first device and the second device) are controlled by different base stations, information for allocating, changing, or releasing link identification information (ie, allocation information, change). Information, release information) may be transmitted to different devices by different base stations. For example, when a first device belonging to a first cell and a second device belonging to a second cell form a first link that is a direct communication link, the first device is controlled by the first base station of the first cell. And the second device is controlled by the second base station of the second cell, so that the first base station transmits allocation information, change information, or release information to the first device, and the second base station transmits allocation information, change information, Or transmit the release information to the second device. Each of the different base stations (eg, the first base station and the second base station) may exchange link identification information and maintenance period information of a link controlled by the base station for uniformity of the link identification information. Each of the different base stations (eg, the first base station and the second base station) may be assigned response information, change response information, or release response received from the device (eg, the first device and the second device) corresponding to the link identification information. Information can be exchanged with each other.

Meanwhile, different base stations (eg, the first base station and the second base station) may be controlled by the eleventh device for the uniformity of the link identification information. Here, the eleventh device is a device to which different base stations (eg, the first base station and the second base station) belong (or are connected) and may be network equipment. Each of the different base stations transmits link identification information and maintenance period information of the link controlled by the base station to the eleventh device. Each of the different base stations (eg, the first base station and the second base station) may be assigned response information, change response information, or release response received from the device (eg, the first device and the second device) corresponding to the link identification information. Information may be transmitted to the eleventh device. The eleventh device receives allocation response information, change response information, or release response information from different base stations (eg, the first base station and the second base station), and uses the received information to identify the link identification information and the sustain period information. Can control and manage

Meanwhile, the link information to be allocated, changed or released may include a device indicator of a device constituting the link, an IP address of a device constituting the link, an FID of the link, or a CID of the link. On the other hand, when communicating via a cellular link rather than a direct communication link, the link information may be an up / down link indicator, a transmit / receive indicator indicating whether the transmission / reception target is a target, or a partner constituting the link. The apparatus may further include reference signal information of the device. On the other hand, when the first device forms a link with a plurality of devices, and there are a plurality of FIDs (or FID combinations, CIDs, and CID combinations), the link information for each link is one FID (or FID) corresponding to the link. Combination, CID, CID combination). Meanwhile, the reference signal information of the counterpart device may include ranging transmission information (or discovery transmission information). The ranging transmission information may include ranging signal transmission opportunity, ranging signal transmission resource information, ranging signal code index, or ranging signal transmission period.

Meanwhile, the maintenance period information may be a period expressed in time (or time unit) or an expiration time expressed in time (or time unit). Where the time unit is a slot index (or slot number), symbol index (or symbol number), subframe index (or subframe number), frame index (or frame number), or super-frame index (super-frame number). Can be. The period expressed in units of time may be a frame duration represented by a frame index. The expiry time expressed in units of time may be a LSB (Least Significant Bit) of the frame index.

Meanwhile, information for allocating, changing, or releasing link identification information (ie, allocation information, change information, release information, allocation response information, change response information, and release response information) may be transmitted through a message, a MAC header, or a control channel. Can be sent.

In IEEE 802.16.1a, an AAI-DC-LC-REQ control message is sent to create a direct communication link. The AAI-DC-LC-REQ message is a link identification information for allocating link identification information, which is a combination of a link identifier (eg, a direct communication link ID) and a device indicator (eg, an HR-MS indicator). May be referred to as a combination). In addition, the AAI-DC-LC-REQ message may include a combination of a TWDC address for transmission and a TWDC address for reception (hereinafter, referred to as a TWDC address combination) as link identification information for allocation of link identification information. In addition, the AAI-DC-LC-REQ message may include a FID combination as link information of an assignment target link (generated link). Meanwhile, in order to support the creation of a plurality of links, the AAI-DC-LC-REQ message may include as many link identifier combinations as the link identification information allocation number (or generation link number) and the link identification information allocation number. In addition, in order to support the creation of a plurality of links, the AAI-DC-LC-REQ message may include a TWDC address combination as many as the link identification information allocation number and the link identification information allocation number. In addition, in order to support the creation of multiple links, the AAI-DC-LC-REQ message may include as many FID combinations as the number of link identification information allocation and the number of link identification information allocation.

Meanwhile, the AAI-DC-LC-REQ message and the AAI-DC-LC-RSP message may be configured as shown in Tables 3 and 4 below.

AAI-DC-LC-REQ Message Format Syntax Bits Note 1 Note 2 for (i = 0; i <N-DC-LINK; i ++) { N-DC-Link is the number of DC links and the range is 1 ~ 4. TWDC address for transmitting 12 Address assigned to the DC link Mandatory TWDC address for receiving
} 12 Address assigned to the DC link Mandatory

AAI-DC-LC-RSP Message Format Syntax Bits Note 1 Note 2 for (i = 0; i <N-DC-LINK; i ++) { TWDC address for transmitting 12 Mandatory Confirmation code
} One 0b0: Accept
0b1: Reject Mandatory

As shown in Table 3, the AAI-DC-LC-REQ message contains a TWDC transmission address (the TWDC address assigned to the link for transmission) by the number of direct communication links (N-DC-Link), and TWDC by the number of direct communication links. It may contain the destination address (the TWDC address assigned to the link for reception).

As shown in Table 4, the AAI-DC-LC-RSP message may include a TWDC transmission address as many as the number of N-DC-Links, and a confirmation code as many as the number of direct communication links. . The confirmation code in Table 4 is information indicating acceptance or rejection of the link generation request, and is set to 0b0 when the terminal accepts the link generation request of the base station, and the terminal selects the link generation request of the base station. If rejected, it is set to 0b1.

Meanwhile, the allocated link identification information may be included in the control information or data when transmitting control information or data for communication. The control information may be transmitted through a control message, a MAC header, or a control channel. The control message may be a MAC control message of the IEEE 802.16.1a standard. The MAC header may be a MAC signaling header or an extension header of the IEEE 802.16.1 standard. The control channel may be a DC Assignment A-MAP IE used for data transmission control in the IEEE 802.16.1a standard. The DC Assignment A-MAP IE is a control channel including a resource allocation area, MCS level, MIMO control information, etc. related to direct communication between terminals.

Meanwhile, the allocated link identification information may be included in the control information through calculation with the specific information of the control information. Alternatively, the assigned link identification information may be included in the control information as one piece of control information. Here, the specific information of the control information may be information used to determine whether the transmission of the control information is successful. Specifically, the specific information of the control information may be a cyclic redundancy check (CRC) code used for error detection. That is, the value obtained by performing XOR operation on the allocated link identification information and the CRC code may be included in the control information. Meanwhile, the CRC code of the DC Assignment A-MAP IE in the IEEE 802.16.1a standard may be masked by a link identifier, and the device indicator may be included in any field value of the DC Assignment A-MAP IE. On the other hand, in the case where a combination of TWDC addresses is used as link identification information in the IEEE 802.16.1a standard, the CRC code of the DC Assignment A-MAP IE is determined by the TWDC address for the transmission of the HR-MS. It may be masked.

Meanwhile, the device constituting the link (eg, the first device) may include the allocated link identification information in the control information or data when transmitting control information or data. When the device configuring the link (eg, the first device) receives control information or data, the link identification information is used to link the received control information or data to a link (eg, the first link) in which the received control information or data is included. Can be judged. In addition, when a device (e.g., a first device) forms a link with a plurality of devices, the device (e.g., the first device) uses the link identification information when receiving control information or data, and the received control information. Or, it can determine which of the plurality of links that the data is associated with. When the device constituting the link (eg, the first device) receives control information or data, the link identification information may be used to distinguish whether the link is included in the link (eg, the first link).

5 is a diagram illustrating a configuration of a communication device according to an embodiment of the present invention.

The communication device (eg, terminal, base station, repeater) includes a transmitter 300, a receiver 200, and a controller 100.

The transmitter 300 transmits the above-described control information, data, or information for allocating, changing, or releasing link identification information (ie, allocation information, change information, release information, allocation response information, change response information, and release response information). Send.

The receiving unit 200 receives the information for allocating, changing, or releasing the above-described control information, data, or link identification information (ie, allocation information, change information, release information, allocation response information, change response information, and release response information). Receive.

The controller 100 controls the transmission of the transmitter 300 and the reception of the receiver 200. In more detail, the controller 100 performs a control function related to the allocation, change, or release of the link identification information. The controller 100 is responsible for the MAC function.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (26)

A communication method of a third device for controlling a first link directly formed between a first device and a second device,
Assigning a first link identifier identifying the first link;
Transmitting first information including the first link identifier to the first device and the second device;
Receiving second information from the first device and the second device, the second information including allocation acceptance information indicating whether to accept or reject the assignment of the first link identifier;
Transmitting third information to the first device and the second device, the third information including a second period for changing a first period that is a period in which the first link identifier is available; And
Receiving fourth information from the first device and the second device, the fourth information including change acceptance information indicating acceptance or rejection of the change for the first period,
The second information includes allocation acceptance information indicating rejection of the allocation of the first link identifier, and scheduled time information for retrying the allocation.
Communication method. The method of claim 1,
The third device is any one of a base station and a repeater
Communication method. The method of claim 2,
The step of transmitting the first information,
Including in the first information a first device indicator identifying the first device assigned to the first link and a second device indicator identifying the second device assigned to the first link.
Communication method. delete delete delete The method of claim 1,
A second link identifying the first link when the acceptance information of the second information indicates rejection of the allocation of the first link identifier even if the second information is not received or the second information is received. Assigning an identifier; And
Transmitting fifth information including the second link identifier to the first device and the second device when the second link identifier is assigned.
Communication method. delete delete delete delete The method of claim 1,
Transmitting fifth information for releasing the assigned first link identifier to the first device and the second device.
Communication method. The method of claim 12,
The transmitting of the fifth information may include:
Including the first link identifier in the fifth information.
Communication method. The method of claim 13,
And receiving sixth information from the first device and the second device, the sixth information including release acceptance information indicating whether to accept the release of the first link identifier.
Communication method. In the communication method of the second terminal to form a first link for direct communication with the first terminal,
Receiving first information from the base station, the first information assigned by the base station and including a first link identifier that is a link identifier for identifying the first link;
Transmitting second information including allocation acceptance information indicating whether to accept or reject the allocation of the first link identifier to the base station;
Receiving third information from the base station, the third information including a second period for changing a first period, the period in which the first link identifier is usable; And
Transmitting to the base station fourth information including change acceptance information indicating acceptance or rejection of the change for the first period,
The second information includes allocation acceptance information indicating rejection of the allocation of the first link identifier, and scheduled time information for retrying the allocation.
Communication method. The method of claim 15,
The transmitting of the second information may include:
If the assignment acceptance information indicates an assignment acceptance when accepting the assignment of the first link identifier; And
Causing the assignment acceptance information to indicate an assignment rejection when rejecting the assignment of the first link identifier.
Communication method. delete delete A method for identifying a first link directly formed between a first terminal and a second terminal by the first terminal,
Requesting transmission of at least one first link identifier assigned to the third terminal to at least one third terminal adjacent to the first terminal;
Receiving the first link identifier from the third terminal;
Assigning a second link identifier different from the first link identifier to identify the first link;
Transmitting first information including the second link identifier to the second terminal;
Receiving second information from the second terminal, the second information including allocation acceptance information indicating whether to accept or reject the allocation of the second link identifier; And
Transmitting third information for changing the period in which the second link identifier can be used from the first period to the second period, to the second terminal,
The first terminal, the second terminal and the third terminal is different from the base station,
The second information includes allocation acceptance information indicating rejection of the allocation of the first link identifier, and scheduled time information for retrying the allocation.
Link Identification Method. The method of claim 19,
The step of transmitting the first information,
Including in the first information a first device indicator identifying the first terminal on the first link and a second device indicator identifying the second terminal on the first link.
Link Identification Method. A communication method of a base station for controlling N communication links directly formed between a first terminal and N second terminals, where N is a natural number of two or more,
A first message identifying the N communication links, the first message comprising a plurality of link identifiers corresponding to each of the N first link identifiers for transmission and the first link identifier and including N second link identifiers for reception; Transmitting to the first terminal; And
Receiving a second message from the first terminal including the N first link identifiers and the N link creation acceptance information indicating acceptance or rejection of the request to create the N communication links.
Communication method comprising a. The method of claim 21,
The transmitting step
Transmitting the first message to the first terminal upon request for creation of the N communication links.
Communication method. The method of claim 21,
Each of the N first link identifiers includes a two way direct communication (TWDC) address for transmission,
Each of the N second link identifiers includes a second bidirectional communication address for reception.
Communication method. delete The method of claim 21,
Each of the N first link identifiers includes a first connection identifier (CID) allocated for transmission;
The N second link identifiers include a second connection identifier allocated for reception.
Communication method.
delete

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