KR101867592B1 - Method for transmitting signal in machine to machine comunication - Google Patents

Abstract

A method for relaying a base station according to the present invention is a method for a first base station operating as a relay station to communicate with a second base station connected to a backhaul, the first base station forming a relay link with the second base station, And the first base station starts the relay mode.

Description

[0001] METHOD FOR TRANSMITTING SIGNAL IN MACHINE TO MACHINE COMUNICATION [0002]

The present invention relates to a transmission method in inter-machine communication.

In machine-to-machine communication system, machine-to-machine (M2M) communication is a system that implements the concept of Internet of Thing. It exchanges information between terminals and base stations, or exchanges information between terminals, Means a communication to be performed. Services that can be implemented using machine-to-machine communications include secured access, surveillance, tracking, tracing, recovery services, public safety services, payment services, healthcare services, remote maintenance and control services, and smart metering services.

In such an inter-machine communication system, an application program provided by a specific subscriber requires efficient transmission of common data to a plurality of terminals. For example, in a plurality of terminal apparatuses, when " report current state "is transmitted, data traffic of the same content is simultaneously transmitted to a plurality of other terminal apparatuses. In the existing communication standard, There is no way to effectively transmit data, so even if the same data is transmitted to each terminal individually, radio resources are wasted.

 Also, in an inter-machine communication system having a plurality of terminals coexisting, it is necessary to efficiently manage and control a plurality of terminals. However, since the current communication system can not support such a control method, individual control signals are transmitted to a plurality of terminals to waste wireless resources.

An object of the present invention is to provide an efficient scheme for simultaneously controlling a plurality of terminals and a scheme for efficiently transmitting common data to terminals.

A transmission method according to the present invention is a method for a base station to transmit to a plurality of terminals in a machine to machine (M2M) communication system, comprising the steps of binding at least one terminal among the plurality of terminals to a group terminal belonging to one group , And allocating a terminal group identifier (M2M device group ID, MGID) indicating the group terminal.

And transmitting the common data to the group terminal at one time.

The step of transmitting common data to the group terminal may include transmitting a paging broadcast message to the group terminal when the group terminal is in an idle state.

The paging broadcast message may be transmitted in a multicast manner.

The paging broadcast message may include information indicating a transmission time point of a burst including the common data.

The paging broadcast message may be transmitted through a broadcast MAP information element (MAP IE).

A code for multicast assignment information may be used as a code for cyclic redundancy check masking in the broadcast MAP IE.

The paging broadcast message may be transmitted through the multicast MAP IE.

After the group terminal receives the common data, the group terminal can be switched to the connected state.

A transmission method according to another embodiment of the present invention is a method in which a base station transmits to a plurality of terminals in a machine to machine (M2M) communication system, in which at least one of the plurality of terminals is divided into a group And transmitting the common data to the group terminal at one time.

The step of transmitting common data to the group terminal may include transmitting a paging broadcast message to the group terminal when the group terminal is in an idle state.

The paging broadcast message may be transmitted in a multicast manner.

The paging broadcast message may include information indicating a transmission time point of a burst including the common data.

The paging broadcast message may be transmitted through a broadcast MAP information element (MAP IE).

A code for multicast assignment information may be used as a code for cyclic redundancy check masking in the broadcast MAP IE.

The paging broadcast message may be transmitted through the multicast MAP IE.

After the group terminal receives the common data, the group terminal can be switched to the connected state.

According to the present invention, in the inter-machine communication system according to the present invention, when common data is transmitted to a plurality of new terminals in a conventional communication system by including them in one burst for each group, common data can be efficiently transmitted to a plurality of terminals Thereby reducing the data transmission load and wasting radio resources.

In addition, a plurality of terminals can be efficiently controlled by guiding a plurality of terminals in an idle state to enter a connection state by transmitting one paging signal for each group.

1 is a diagram showing an inter-machine communication system according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method of assigning an identifier of a terminal in an inter-machine communication system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, a mobile station (MS) is referred to as a terminal, a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) terminal, an AT, a user equipment (UE), or the like, and may include all or some of functions of a terminal, MT, SS, PSS, AT, UE,

In addition, a base station (BS) includes a node B, an evolved node B, an eNodeB, an access point (AP), a radio access station (RAS) a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may include all or some of functions of a Node B, an eNodeB, an AP, a RAS, a BTS, and an MMR-BS.

A machine to machine (M2M) communication system according to an embodiment of the present invention will now be described in detail.

1 is a diagram illustrating a basic M2M service system architecture according to an embodiment of the present invention.

Referring to FIG. 1, an inter-machine communication system includes a plurality of terminals 100, a base station 200, and an M2M server 300.

The following are the features and requirements differentiating from the existing standards for such inter-machine communication systems, for example, communication systems conforming to IEEE (Institute of Electrical and Electronic Engineers) 802.16e and IEEE 802.16m.

First, extreme low power consumption is required. Equipment used for machine-to-machine communications must be capable of operating in extreme low-power conditions for extended periods of time. This is indispensable because it is difficult to supply power directly to the machine-to-machine communication system, there should be no human interaction for a long time, and the battery must be operated for a long time even when the exchange of plural sensor devices is difficult.

Next, high reliability is required. This is a factor required to enable a reliable connection and transmission between the terminal 100 and the server at any time during communication between the machines. That is, even when the terminal 100 moves or the channel quality changes, the terminal 100 and the server must be able to connect with high reliability. This may be required for applications that transmit emergency data or sensitive data during inter-machine communication services, such as health care, security control, monitoring, public safety, payment, remote management and control services.

The following requires improved access priority. The improved access priority means that the terminal 100 should be able to provide priority among the terminals 100 when accessing the server through the network. The priority access can be used for all of the terminals 100 requiring alert communication, emergency communication, or immediate attention. This element may also be required in health care, security access, surveillance, public safety, remote management and control services.

Next, transmission of the plurality of terminals 100 is required. Since the terminal 100 requires little human interaction, a plurality of terminals 100 can be operated in one service at the same time. Accordingly, an efficient transmission scheme of the plurality of terminals 100 is a key element in the inter-machine communication system. That is, a plurality of terminals 100 must be able to smoothly connect to a network through a base station at the same time.

Next, a plurality of terminal (100) address systems are required. In the inter-machine communication system, since a plurality of terminals 100 can be operated, an appropriate terminal 100 address system is required.

Next, group control is required. In order to efficiently control and operate the plurality of terminals 100, there is a need for a method of efficiently controlling and transmitting data by grouping a plurality of terminals 100 in an inter-machine communication system.

The following security is required. In other words, security is required to provide integrity and confidentiality in an inter-machine communication system. In a remote network, a malicious security threat can be seen in all directions, regardless of hardware, software, and firmware. Thus, in a remote network, the inter-machine communication system must be equipped with an appropriate security mechanism to authenticate and authorize the devices 100 and the network devices with the devices.

The following requires a small size transmission. Data transmission of very small size can be a phenomenon that frequently occurs due to the characteristics of an inter-machine system including a plurality of sensors. Therefore, the inter-machine communication system should be designed so that very small data transmissions can be transmitted with very little load.

The following requires low mobility. Some of the inter-machine communication services require very low power operation, which also affects machine mobility. That is, in order to operate the terminals 100 with very low power, there is no movement of the terminals 100 or it is required to be limited within a certain distance. Accordingly, the inter-machine communication system that provides such a service can simplify the operations for moving the terminal 100, thereby minimizing the system load.

The following requires time-varying operation. The inter-machine communication system can be implemented in the direction of increasing the efficiency of the system through low access priority or delayed data transmission for time-varying services.

Next, unidirectional data traffic transmission is required. The inter-machine communication system can transmit data only to the terminal 100 or transmit data only to the server according to the targeted service. At this time, the control data can be transmitted in both directions.

The following requires extremely low latency. The inter-machine communication system may require that the desired data be transmitted in an extremely low latency depending on the target service. To implement this, the inter-machine communication system requires a greatly reduced network access delay and data transmission delay.

The following requires an extremely long control range. A particular machine-to-machine communication service wants to include very large areas at once. This element is not a requirement that an inter-machine communication system must include, but it can maximize the economic effect if it is included.

The following requires rare traffic transmission. A specific inter-machine communication service may require only the transmission of very irregular data traffic from or to the terminal 100. Therefore, an efficient power strategy method is needed.

Now, a method of grouping a plurality of terminals 100 according to services in an inter-machine communication system and effectively transmitting common data and control signals to terminals 100 belonging to the group will be described in detail.

According to an embodiment of the present invention, at least one terminal of a plurality of terminals 100 may be grouped into one group 10 by a subscriber providing a service to the terminal 100 in the inter-machine communication system And an identifier according to the identifier can be assigned to the group 10. This identifier is referred to as an M2M device group ID (MGID) in the inter-machine communication system. When the terminal 100 first registers with the communication system, the identifier is associated with the individual identifier (M2M Device ID, MDID) . The individual identifier of the terminal 100 in the inter-machine communication system is an identifier for distinguishing the terminal 100 in the connected state from the terminal 100 uniquely in the base station and is returned to the base station when the terminal 100 is changed to the idle state. During the process of entering the communication system, the terminal 100 may use a temporary MDID until a registration is completed, and it uses a part of the individual identifier (MDID) area of the terminal 100. The individual identifier (MDID) of the terminal 100 in the inter-machine communication system is connected and disconnected to the system of the terminal 100 by the base station in the same manner as the terminal identifier (STID) of the conventional communication system, For example.

Now, an identifier allocation method of a terminal will be described in detail with reference to FIG.

2 is a flowchart illustrating a method of allocating an identifier of a terminal according to an embodiment of the present invention.

Referring to FIG. 2, the terminal 100 to which the terminal 100 accesses the system obtains downlink synchronization (comments) and system information (S210). Then, the terminal 100 performs initial ranging an initial ranging procedure is performed (S220).

After the ranging procedure is successfully performed, the terminal 100 is allocated a temporary terminal identifier (TMDID) from the base station 200 (S230). Then, the terminal 100 performs an initial network connection procedure, for example, capacity negotiation, authorization, and key exchange using the assigned temporary terminal identifier (S240). When the terminal 100 is registered in the network, the terminal 100 receives the terminal identifier (MDID) from the base station 200 (S250). At this time, the temporary terminal identifier is deallocated.

Meanwhile, the individual identifier (MDID) of the terminal 100 can be set to the same length (12 bits) as the terminal identifier (STID) of the conventional communication system in consideration of backward compatibility. (DID registration ID, DID) of a conventional communication system, for example, IEEE 802.16m, is added when an idle state is entered with an individual terminal identifier in the idle state in addition to the individual identifier (MDID) in the connected state of the terminal 100 Lt; / RTI >

In the inter-machine communication system, the group identifier (MGID) of the terminal 100 is maintained in an idle state in which the terminal 100 is disconnected from the system, and can be updated by the system or the base station 100 . The length of the group identifier (MGID) of the terminal 100 in the inter-machine communication system may be determined according to the manner in which the group identifier (MGID) is used. In the case of using only a group of idle terminals, the conventional communication system, for example, the same length as the individual terminal identifier (DID) in the idle state of IEEE 802.16m or other conventional communication system such as IEEE 802.16e medium It can be equal to 24 bits, which is the length of the media access control (MAC) address hash. When the group identifier (MGID) is used for control and data transmission of terminals in a connected state as well as in an idle state, the terminal identifiers (STID) in a conventional communication system, for example, a connected state of IEEE 802.16m The length can be given as 12 bits. Even when the same terminal ID (STID) of the conventional communication system is allocated, a different identifier allocation area is used for the terminal individual identifier (MDID). The terminal group 10 classified by the terminal group identifier (MGID) may be generated for each terminal type, user, and application program in addition to the terminal subscriber. Also, the base station 20, the control network, and the like perform allocation according to the uniqueness range of the terminal group identifier.

The base station 200 includes data to be transmitted as a payload in a control message when it is necessary to transmit the same data to a plurality of terminals 100 belonging to the same group 10 divided by a group identifier (MGID) And transmits the control message to all the terminals 100 in the group 10 through one transmission.

The base station 200 transmits scheduling information to be received by a plurality of terminals 100 belonging to the same group 10 in a control message. The scheduling information is radio resource information to which a plurality of terminals (100) belonging to the same group (10) are allocated data bursts to be received. The MS 100 receiving the control message can receive the broadcast data burst using the scheduling information included in the control message. The control message used at this time may be different according to the current state of the terminal 100. This will be described in detail.

Is a method for efficiently transmitting common data to the terminal 100 in a connected state.

The IEEE 802.16m standard uses an AAI_L2-XFER (Advanced Air Interface_L2_Transfer) message to efficiently transmit less than 140 bytes of data, such as short message service (SMS) messages, to the terminal 100 in the connected state. SMS and can be transmitted on the control channel without connection setup with the terminal 100. However, in the IEEE 80216.m standard, the AAI_L2-XFER message is transmitted to the terminal 100 by a unicast method It is not effective to transmit common data to a plurality of terminals 100. [

Therefore, in one embodiment of the present invention, the AAI_L2-XFER-GRP (advanced air interface_L2_transfer_group) message is transmitted to the group 10 in a multicast manner, and the common data is efficiently transmitted to the plurality of UEs 110. [ The AAI_L2-XFER-GRP message transmitted in units of the group 10 includes information indicating the actual transmission time of the individual data or common data that can be transmitted to the UE 100, that is, scheduling information of the data burst. A scheme of transmitting the AAI_L2-XFER-GRP message on a group-by-group basis includes a method of transmitting through a broadcast MAP information element (MAP IE) and a method of transmitting through a multicast map information element (MAP IE).

The following is a method for effectively transmitting common data to the terminal 100 in an idle state.

In order to transmit data to the terminal 100 in an idle state, the terminal 100 must first inform the terminal 100 of the existence of data to be received through paging. In the communication system, when there is no data to be transmitted / received from the base station 200 in order to save power consumption, the terminal 100 enters the idle state and periodically supplies power to the base station 200 for data transmission / Thereby reducing the power consumption of the terminal 100. FIG. That is, the idle terminal 100 periodically powers the transmitting and receiving device to check whether there is data corresponding to itself from the base station 200, and when there is no data, the power supply to the transmitting and receiving device is blocked until the next waking period Power consumption is reduced. In this situation, when there is data to be sent to the terminal 100 in the idle state, the base station 200 informs the terminal 100 of this fact as paging.

The base station 200 transmits a paging signal, for example, a paging message (AAI-PAG) to the terminal 100 in accordance with a listening interval in which the terminal 100 wakes up and receives a paging channel signal from the base station 200. [ -ADV) message. The terminal 100 receiving the paging signal during the monitoring period checks whether the received signal is a signal for itself according to whether the terminal identifier (DID) in the paging signal is included or not.

If the signal is a signal for the terminal 100, the terminal 100 returns to the connected state in which it can enter the network to the corresponding base station 200 and smoothly send and receive data.

As described above, in order to transmit data to the terminal 100 in the idle state, the base station 200 must first send a paging signal to the terminal 100 to establish a connection state. The IEEE 802.16m standard provides a method for receiving data while small amount of data, for example, data of less than 140 bytes, while the terminal 100 remains in an idle state without entering a connection state. However, since the method uses a unicast method, when the common data is transmitted to the plurality of idle terminals 110, the base station 200 can transmit the same data to the plurality of the terminals 110 to waste resources.

Therefore, according to an embodiment of the present invention, when transmitting common data to a plurality of idle terminals 110, the base station 200 can transmit data to the plurality of terminals 110 in a multicast manner .

Methods for transmitting a paging signal in a multicast manner include an SMS extension scheme and a paging message extension scheme, which will be described in detail.

First, the SMS extension method will be described in detail.

In the SMS extension method, the terminal 110 in the idle state in the existing IEEE 802.16m or IEEE 802.16e standard receives a control message including simple data such as SMS, for example, a ranging response (AAI_RNG-RSP) control message And extracting the data contained therein is extended to multicast. That is, the SMS extension scheme is a group SMS control message that is similar to an SMS control message and is delivered in a multicast manner when the base station 200 transmits common data to the idle MSs 110, for example, a ranging response group AAI_RNG-RSP-GRP) message. The group SMS control message includes position information of a burst containing information indicating a transmission time point of a burst containing common data or common data to be transmitted to all terminals 110 belonging to the group 10. Since the group SMS control message is transmitted on a group basis, the base station 200 can efficiently transmit data at one time without the terminal 110 in the idle state entering the connection state.

The group SMS control message may be transmitted via the broadcast MAP IE or via the multicast MAP IE. In this case, by including the terminal group identifier (MGID) in the broadcast MAP IE or the multicast MAP IE instead of the conventional individual terminal identifier (DID), the corresponding information is transmitted to all the terminals 110 belonging to the specific group 10 .

The paging message expansion method will now be described in detail.

The paging message extension scheme is a method of multicasting a paging message to a plurality of idle terminals 110. For example, a paging broadcast group (AAI_PAG-ADV-GRP) message, in order to transmit a paging signal to the idle terminal 110 in the group 10 in a multicast manner. The paging broadcast group (AAI_PAG-ADV-GRP) message includes common data to be received by the entire group 10 or information indicating a transmission time point of a burst including common data. Thus, the base station 200 can efficiently transmit common data at a time without the terminal 110 in the idle state entering the connection state.

The paging broadcast group (AAI_PAG-ADV-GRP) message may be transmitted via the broadcast MAP IE or through the multicast MAP IE. In this case, by including the group identifier (MGID) in the broadcast MAP IE or the multicast MAP IE instead of the conventional individual terminal 100 identifier (DID), the corresponding information is transmitted to all the terminals 110 belonging to the specific group 10 Lt; / RTI >

When a paging signal or data to be received after paging is transmitted to the terminal 110 using the paging broadcast group (AAI_PAG-ADV-GRP) message, a plurality of terminals 110 belonging to the same group 10 in the idle state ) Can be switched to the connection state at a time.

On the other hand, it is not necessary to use the paging broadcast group (AAI_PAG-ADV-GRP) message in order to transmit the paging signal in units of the group (10). In the IEEE 802.16m, an existing paging signal transmission message, for example, a paging broadcast (AAI_PAG-ADV, PAG-ADV) message used in the existing IEEE 802.16m or IEEE 802.16e is provided in order to transmit a paging signal in units of a group Or a multicast data traffic transmission method using a broadcast MAP IE.

Now, a method of transmitting a message on a group basis through multicast will be described in detail.

As described above, there are a method using a broadcast MAP IE and a method using a multicast MAP IE in the following method of transmitting a message in units of groups (10) using multicast technology.

First, the method using the broadcast MAP IE transmits a message for the group 10 via the broadcast MAP IE. If AAI_L2XFER, AAI_RNG-RSP and AAI_PAG-ADV messages are to be used instead of AAI_L2-XFER-GRP, AAI_RNG-RSP-GRP or AAI_PAG-ADV- A code for cyclic redundancy check (CRC) masking in the broadcast MAP IE is used as a code for multicast assignment information designed for multicast data transmission in the IEEE 802.16m system . In the broadcast MAP IE, a value indicating that the corresponding burst is multicast assignment information is used to indicate that the content in the burst indicated by the MAP IE is multicast data. In this case, the terminal group identifier (MGID) may include a newly defined inter-machine terminal group identifier in a field indicating a corresponding multicast identifier in the broadcast MAP IE, for example, a Multicast Group Identification (MGID) field. Accordingly, the UE 110 checks the MGID included in the broadcast MAP IE to determine whether to receive the MGID. Unlike the multicast identifier of the conventional system, the newly defined terminal 100 group identifier may include not only a connected state but also an idle terminal group.

If they use control messages (AAI_L2-XFER-GRP, AAI_RNGRSP-GRP, AAI_PAG-ADV-GRP) for group transmission, they can be transmitted in the form of broadcast bursts in the broadcast MAP IE. Therefore, the code for CRC masking is also set as the code for the broadcast burst. When control messages (AAI_L2-XFER-GRP, AAI_RNGRSP-GRP, AAI_PAG-ADV-GRP) are transmitted in a broadcast burst, other messages may be transmitted in the same broadcast burst. At this time, the terminal group identifier (MGID) is included in each control message and transmitted. Accordingly, after receiving all the broadcast bursts transmitted through the broadcast MAP IE, the UE 110 decodes the message included in the burst, checks the group identifier (MGID) included in the message, .

Next, a method of transmitting a multicast MAP IE is a method of creating a multicast-specific MAP IE and transmitting a group-based control message or data to the UEs 110 grouped by the multicast-specific MAP IE. The multicast MAP IE may have a structure similar to a broadcast MAP IE, for example, a broadcast A-MAP IE of IEEE 802.16m, a broadcast MAP IE of IEEE 802.16e, or a unicast assignment MAP IE of IEEE 802.16e. In the multicast MAP IE, a corresponding group ID (MGID) may be delivered to the UE 100 through the CRC masking as in the multicast MAP IE, or may be added to the UE 110 as a field of the broadcast MAP IE.

The multicast MAP IE may be implemented through an EA (Extended Assignment) A-MAP IE of the IEEE 802.16m standard. At this time, the multicast MAP IE is distinguished by the EA A-MAP IE Type field of the EA A-MAP IE.

The control message and the data transmitted through the multicast MAP IE can all be the destinations of the group 10 as a whole. Therefore, control messages and data other than the paging signal can also be transmitted to the entire group 10 at once through the multicast MAP IE.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (17)

A method for a base station to transmit to a plurality of terminals in a machine to machine (M2M) communication system,
Grouping at least one terminal among the plurality of terminals into a group terminal belonging to one group;
Assigning a terminal group identifier (M2M device group ID, MGID) indicating the group terminal; And
And transmitting a paging broadcast message to the group terminal when the group terminal is in an idle state,
And when the group terminal receives the common data, the group terminal is switched to the connected state. delete delete The method of claim 1,
Wherein the paging broadcast message is transmitted in a multicast manner. 5. The method of claim 4,
The paging broadcast message
And information indicating a transmission time point of a burst including the common data. The method of claim 5,
Wherein the paging broadcast message is transmitted through a broadcast MAP information element (MAP IE). The method of claim 6,
And a code for multicast assignment information is used as a code for cyclic redundancy check masking in the broadcast MAP IE. The method of claim 5,
Wherein the paging broadcast message is transmitted through a multicast MAP IE. delete delete delete delete delete delete delete delete delete

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