KR20150117600A - Method and system for providing data communication through a cluster head for machine type communication based group communication - Google Patents

Abstract

According to various embodiments of the present invention, disclosed are a method and a system for providing data communications for machine-type communications (MTC) devices. The method includes the operations of: selecting at least one cluster head from multiple clusters; receiving, by the cluster head, a data traffic transmission request from one or more MTC devices; determining availability of network resources for transmitting data traffic; and setting dedicated connection between the cluster head and a base station to transmit the data traffic from the one or more MTC devices to the base station. The data traffic transmission request includes at least one among an activated state of the one or more MTC devices, a buffer occupation state, and a delay allowance value.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and system for providing data communication through a cluster head for MTC-based group communication,

Field of the Invention The present invention relates to the field of machine type communications (MTC), and more particularly, to a method and system for enabling data communication via a cluster head through a dedicated connection for MTC based group communication.

Machine to Machine (M2M) / Machine Type Communication (MTC) applications are applications where machines communicate directly with each other without human intervention. Examples of applications include smart metering, safety applications, health monitoring, fleet management, data applications and remote applications.

The MTC device can be embedded in automobiles, consumer electronic devices, bending devices, and the like. These devices are large and widespread. Applications must communicate over widely deployed networks that connect MTC devices to the Internet to form the Internet of Things (IoT). It would be ideal to use a cellular network as some existing MTC deployments may use local communications while infrastructure may be set up in a stable manner and support multiple MTC devices.

The huge amount of signaling flow generated by the multiple MTC devices attempting to connect to the network at the same time leads to congestion of the radio access network (RAN) and the core network (CN). This in turn causes intolerable delays, packet loss and service unavailability. Congestion in the MTC also affects non-MTC devices.

Generally on the RAN side, this congestion occurs when multiple MTC devices want to communicate with the eNodeB at the same time. For example, MTC devices used for monitoring (bridge monitoring or rainfall / flood monitoring) transmit monitoring data at the same time. As devices are connected to the same eNodeB using the same common channel (random access), they can lead to congestion. As a result, the network must be optimized to support communication requests from devices at the same time.

In Release 11, 3GPP System Architecture Workgroup 1 (SA1) defined system aspects and technical specifications for MTC devices for possible improvements to network communications for device communications, group-based services, and MTC. Access class barring schemes, separate random access channel (RACH) resources for MTC, dynamic allocation of RACH resources, MTC specific backoff scheme, slotted access ) Are proposed by 3GPP to overcome this congestion problem. In 3GPP, these solutions will distribute the RACH load. However, ultra high density placement of Pico cells will damage either M2M devices or human-to-human (H2H) users.

The scenario employed here considers a combined environment with constant movement of the MTC device with a static MTC device. This creates congestion in the RAN due to random access contention during uplink transmissions in which multiple MTC devices attempt to transmit data to the network. In addition, capacity is improved during downlink transmission while supporting multiple MTC devices with existing H2H interactions in downlink transmission. In addition, the RACH burst from the MTC devices will overload the RACH accessing the eNodeB, thereby causing the cellular user to have normal service rights due to overloading of the RACH by the high density M2M devices .

In view of the foregoing, there is a need for an MTC device-friendly system and method that provides access to MTC devices by minimizing the RACH load in MTC-based communications.

Various embodiments of the present invention disclose a method and system for providing data communication for a machine type communications (MTC) device. The method includes selecting at least one cluster head, receiving a request to transmit data traffic from one or more MTC devices by the cluster head, and determining availability of one or more network resources to transmit data traffic . The cluster then establishes a dedicated connection with the base station to transmit data traffic from the one or more MTC devices to the base station based on availability of one or more network resources. The data transfer request includes at least one of an active state, a buffer occupancy state, and a delay tolerance of one or more MTC devices.

According to an embodiment of the present invention, the step of determining availability of base station resources for transmitting data traffic comprises: generating a priority list of active MTC devices based on the delay tolerance; Comparing the delay tolerance of the active MTC devices with a time required for establishing a connection with a base station; Triggering a connection request with the base station if the delay tolerance for the high priority MTC device is equal to a preset time, and establishing a dedicated connection with the base station to transmit the data traffic do. The delay tolerance here is defined as the total allowed communication time that does not affect the quality of service for the MTC device.

According to an embodiment of the present invention, the method further comprises: the cluster head transmitting at least one of ACK or NACK messages from the base station via the dedicated connection established between the cluster head and the base station; And relaying at least one of an ACK or NACK message from the base station to the MTC device.

According to an embodiment of the present invention, the cluster head establishes and cancels a dedicated connection with the base station based on traffic input from the one or more MTC devices.

According to an embodiment of the present invention, the predetermined time is a time interval required for establishing a dedicated connection between the cluster head and the base station.

According to an embodiment of the present invention, the method further comprises sub-clustering a plurality of MTC devices in the cluster based on the first set of parameters. The first set of parameters includes a congestion level and a signal-to-noise ratio (SINR) associated with the plurality of MTC devices.

According to one embodiment of the present invention, the congestion level based sub-cluster formation is performed based on a load index, and the load index is an average of resource utilization at the base station.

According to an embodiment of the present invention, the method comprises the steps of: calculating the load index of a selected base station; And redirecting one or more MTC devices from a first base station to a second base station if the load index of the second base station is greater than a previous load index and less than a maximum load index, Is associated with maximum availability of network resources.

According to one embodiment of the present invention, the method further comprises, when the load index of the first base station is less than the previous load index and less than or equal to the minimum load index, And redirecting to the second base station with a load index between the index and the minimum load index. The minimum load index is associated with the minimum availability of network resources.

According to one embodiment of the present invention, the method further comprises redirecting one or more MTC devices from the first base station to the second base station if the load index of the first base station is greater than the maximum load index; And shutting down the primary base station.

According to an embodiment of the present invention, the formation of the SINR-based sub-cluster includes: measuring SINR by each MTC apparatus for each base station; Reporting the SINR value to a serving base station; Sharing an SINR report with a plurality of neighbor base stations by the serving base station; Sorting, by each base station, the reported SINR for the one or more MTC devices for each base station; And generating a sub-cluster based on a common SINR sequence for the one or more MTC devices for each base station.

According to an embodiment of the present invention, the cluster head has a decreasing order of SINR (SINR) for neighboring base stations or cooperative base stations having the highest SINR and serving the cluster head jointly with the serving cell, Respectively.

Embodiments of the present disclosure also disclose a method for providing data communication for a Machine Type Communication (MTC) device for multiple base stations in wireless communication. The method comprising the steps of: informing, by the cluster head, the primary base station to which each MTC device is assigned to one or more MTC devices in the cluster; Updating the active state of the one or more MTC devices to the cluster head by each of the MTC devices; Requesting a network resource from a specific base station whenever transmission to the sub-cluster MTC apparatus is prepared; Requesting a secondary base station by the primary base station if communication is broken because network resources are not available; Shifting one or more MTC devices from a sub-cluster corresponding to the primary base station to a sub-cluster corresponding to the auxiliary base station, wherein the shifting comprises: Wherein the MTC device is not present in the network resources associated with the base station, and wherein the one or more MTC devices corresponding to the subcluster are notified by the cluster head of the subsidiary station Step < / RTI >

The various embodiments of the present disclosure also disclose a method for providing data communication for a Machine Type Communication (MTC) device for multiple base stations in wireless communication. The method comprising the steps of: informing one or more MTC devices in a cluster of a primary base station to which each MTC device is assigned, by a sub-cluster head; Updating the active state of the MTC apparatus to the sub-cluster head by each of the MTC apparatuses; Requesting a network resource from a specific base station whenever transmission to the sub-cluster MTC apparatus is prepared; Requesting, by the primary base station, a secondary base station in the case of a communication disconnection due to the inability to use the network resource; Providing information of the auxiliary base station from which the sub-cluster head can initiate MTC communication; Retrieving the sub-cluster head connected to the auxiliary base station from the grouping information; Shifting the one or more MTC devices from a sub-cluster corresponding to the primary base station to a sub-cluster corresponding to the secondary base station; Notifying by the sub-cluster head of the auxiliary base station that one or more MTC apparatuses corresponding to the sub-cluster can be shifted; And initiating data traffic transmission from the one or more MTC devices to the auxiliary base station via a connection established between the sub-cluster head and the auxiliary base station.

According to an embodiment of the present invention, when more than half of the delay tolerance associated with the one or more MTC devices and the MTC device does not have the network resources associated with the base station, the sub-cluster head requests the auxiliary base station .

According to an embodiment of the present invention, the method comprises the steps of: providing information of the one or more MTC devices requesting network resources to the sub-cluster corresponding to the auxiliary base station; Storing the one or more MTC devices requesting network resources as a sub-cluster member; And requesting network resources from the auxiliary base station by the sub-cluster head.

According to one embodiment of the invention, each sub-cluster head serving one or more associated MTC devices is connected to the serving base station via a dedicated connection.

According to an embodiment of the present invention, the method includes providing grouping information of auxiliary MTC devices to the plurality of MTC devices in the cluster. The grouping information informs the MTC device which base station is associated with which MTC device, and the method is further characterized in that the MTC devices of one subcluster communicate with one or more MTC devices via one or more MTC devices using d2d communication And making the connection to the cluster possible.

According to an embodiment of the present invention, the MTC apparatuses of the one subcluster are in a subcluster in which the delay tolerance expiration of the MTC apparatus and the MTC apparatus do not have resources from the associated base station; And the sub-cluster head connected to the macro base station can not serve the MTC apparatus in the sub-cluster.

The embodiments of the present disclosure also disclose a method for providing data communication for a machine type communication (MTC) device in group-based wireless communication. The method comprising: selecting at least one cluster head for a plurality of clusters, each cluster comprising one or more MTC devices that are members of a cluster associated with the cluster head; Receiving a message from the one or more MTC devices for transmitting data traffic if the one or more MTC devices are active, the message comprising at least one of an active state, a buffer occupancy state and a delay tolerance of the one or more MTC devices ; Determining availability of network resources for transmitting the data traffic based on the buffer occupancy state of the one or more MTC devices; Establishing a dedicated connection with a base station for transmitting the data traffic; And transmitting data traffic from the one or more MTC devices to the base station via a connection established between the cluster head and the base station.

Embodiments of the present disclosure also provide a system for providing data communication for a machine type communication (MTC) device in group-based wireless communication. The system comprising: at least one cluster head for a plurality of clusters; and each of the plurality of clusters comprises one or more MTC devices that are members of a cluster associated with the cluster head. Wherein the message comprises at least one of an activation state, a buffer occupancy state, and a delay tolerance of the one or more MTC devices when the at least one MTC device is activated; Determining availability of network resources to transmit the data traffic based on the buffer occupancy state of the one or more MTC devices, establishing a dedicated connection with the base station for data traffic transmission, establishing a dedicated connection between the cluster head and the base station And at least one network element configured to transmit the data traffic from the one or more MTC devices to the base station via a connection established in the network. The delay tolerance is defined as total allowed communication time that does not affect service quality for the MTC member device.

According to one embodiment of the present invention, the system further comprises at least one element configured to perform subclustering of the plurality of MTC devices in the cluster based on a first set of parameters. The first set of parameters includes a congestion and a signal-to-noise ratio (SNR) associated with the plurality of MTC devices.

The foregoing describes in general terms various aspects of the present invention and will serve to help a more thorough understanding of the following detailed description. With reference to these, it will be clear that the invention is not limited to the applications of the methods or applications described and illustrated herein. It is intended that the advantages and objects of the invention, which are apparent from the description or examples contained herein, are within the scope of the invention.

Other objects, features and advantages will be apparent to those skilled in the art from the following detailed description of the preferred embodiments,
Other objects, features and advantages will be apparent to those skilled in the art from the following detailed description of the preferred embodiments,
1 is a high level architecture of an LTE system illustrating a working environment according to an embodiment of the present invention.
2 is a scenario diagram illustrating a RAN overload problem due to a request from MTC devices according to the prior art;
3 is a scenario diagram illustrating a method for communicating data to MTC devices via a dedicated connection with a cluster head, in accordance with an embodiment of the present invention.
Figure 4 is a schematic diagram illustrating a RAN overload problem solved by a dedicated connection between an MTC device and a cluster head, in accordance with an embodiment of the present invention.
5 is a schematic diagram of a timing diagram for a single base station-based MTC communication, in accordance with an embodiment of the present invention.
6 is a scenario diagram illustrating data transmission for single base station based MTC communication, in accordance with an embodiment of the present invention.
7 is a flow diagram illustrating a messaging sequence for MTC-only connection based communication, in accordance with an embodiment of the present invention.
8 is a schematic diagram of a timing diagram for MTC dedicated connection based communication, in accordance with an embodiment of the present invention.
9 is a scenario diagram illustrating data transmission for multiple base station dedicated connection based communication for MTC devices, in accordance with an embodiment of the present invention.
10 is a schematic diagram showing load index and SINR-based sub-cluster information according to an embodiment of the present invention.
FIG. 11 is a scenario diagram illustrating data transmission over a cluster head dedicated connection-based communication for an MTC device to multiple base stations, in accordance with an embodiment of the present invention.
12 is a schematic diagram of a timing diagram for communication based on dedicated base station cluster head dedicated connections for MTC devices, in accordance with an embodiment of the present invention.
13 is a flow chart illustrating a messaging sequence for cluster head dedicated connection based communication for an MTC device, according to an embodiment of the present invention.
FIG. 14 is a scenario diagram illustrating data transmission through communication based on dedicated cluster-head dedicated sub-cluster heads for multiple base stations for an MTC apparatus according to an embodiment of the present invention.
15 is a flowchart illustrating a messaging sequence for communication based on dedicated cluster sub-cluster heads for an MTC apparatus, according to an embodiment of the present invention.
16 is a schematic representation of a timing diagram for communication based on dedicated base station sub-cluster heads dedicated to MTC devices, according to an embodiment of the present invention.
Although specific features of the present invention are shown in some drawings and not in different drawings, it is to be understood that each feature may be combined with any or all of the other features of the present invention.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. The present invention can be modified in various forms. Accordingly, embodiments of the present invention are provided only to illustrate the present invention to those skilled in the art. In the accompanying drawings, like reference numerals are used to denote like elements.

The specification may refer to an embodiment (s) of "an", "one", or "some" in various places. It is not necessarily to be understood that each such reference is the same embodiment (s), or that the function is applied to only a single embodiment. A single feature of other embodiments may also be combined to provide other embodiments.

As used herein, the singular forms "a," "an," and "the" are intended to include the plural, unless the context clearly dictates otherwise. In addition, where the terms "comprises", "includes", "comprises", "including" and / or "comprising" Elements and / or components, but does not preclude the presence or addition of one or more other features, numbers, steps, operations, components, components and / or groups. It will be appreciated that, where an element is referred to as being "connected" or "coupled" to another element, it may be present in a direct connection or through a bond or element to another element. Also, "connected" or "coupled ", as used herein, may include operatively connected or coupled. As used herein, the term "and / or" includes any and all combinations of one or more associated enumerated items and one or more combinations and arrangements.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. This should be interpreted as terms in the context of the relevant field which have the same meanings as their meanings, as defined in the commonly used dictionary, and are not to be construed as ideal or excessive formal meaning unless expressly defined herein I will not.

1 is a high-level architecture of an LTE system illustrating a working environment according to an embodiment of the present invention. The MTC gateway is a type of MTC device with 3GPP mobile communication capability. The MTC gateway connects to an MTC capillary network that includes local access devices that use local technologies for communication. The MTC gateway device serves as a middle agent between the local access device and the MTC server. The MTC server operates within the 3GPP network.

Figure 2 is a scenario diagram illustrating a RAN overload problem due to a request from MTC devices, in accordance with the prior art example. Many MTC devices are generally arranged in a vast number. As a result, the RACH burst from the MTC devices overloads the RACH accessing the eNodeB. As a result, due to the overload of the RACH caused by the high-density M2M device, the cellular user can not be served normally.

3 is a scenario diagram illustrating a method of communicating data to MTC devices through a dedicated connection to a cluster head, in accordance with an embodiment of the present invention. The user equipment (UE) establishes a dedicated connection from the cluster head to the eNodeB based on the pattern of data traffic received from the MTC devices. Similarly, the UE releases the dedicated connection based on the traffic pattern of the MTC device. Because most traffic is expected to be in nature intermittent, the traffic pattern provides the duration of a dedicated radio resource control (RRC) connection. To release the dedicated connection, the cluster head uses the RRC disconnect timer.

As shown in FIG. 3, a dedicated connection is established between the cluster head and the eNodeB, and by providing a continuous flow from the cluster head to the eNodeB, RACH access for RRC connection is minimized, and for MTC traffic between the MTC device and eNodeB Thereby providing more appropriate power control and reducing the latency to access the eNodeB.

4 is a schematic diagram illustrating a RAN overload problem solved by a dedicated connection between an MTC device and a cluster head, in accordance with an embodiment of the present invention. At time instance t1, it is assumed that a dedicated connection is established between the cluster head and the base station, and the MTC devices D1 and D2 will be activated for MTC transmission / reception. Where the data from the D2 and D1 devices will be transported or received through the cluster head. Embodiments herein prevent overload in the RAN by avoiding opportunistic RACH transmissions to the base station. A dedicated connection between the cluster head and the base station for data transport from the MTC devices associated with the cluster head is located around the cluster circuit.

5 is a schematic diagram of a timing diagram for a single base station based MTC communication, in accordance with an embodiment of the present invention. The MTC devices herein correspond to a cluster member of a cluster, and the cluster members update their active cluster head, occupied buffer and delay tolerance when the cluster member is activated. The cluster head prepares a priority list of the active MTC devices based on the residual delay tolerance of the MTC devices. For example, let TBS be the time required to establish a dedicated connection between the cluster head and the base station. The residual delay tolerance of the higher priority device is then associated with the TBS. The channel head triggers a connection request with the base station if the residual delay tolerance for the higher priority device equals the TBS. The channel head then requests network resources with buffer occupancy BOTotal. Here, the buffer occupancy rate is defined as follows:

Where i = 1 to N and N is the maximum number of active cluster members.

=

이다. 인스턴트 t2에서, 데이터 전송은 채널 헤드와 네트워크 사이에 형성된 전용 연결을 통해 발생한다.At instant tl, the channel head triggers a connection request to the base station as the residual delay tolerance for device 2 (the highest priority device at that moment) becomes equal to T _BS . At instant t2, the channel head sends a buffer occupancy report to the eNb and sums all buffer occupancies in the plurality of MTC devices at the eNb. For example, if the buffer occupancy for device Di is BOi,

=

to be. At instant t2, data transmission occurs through a dedicated connection formed between the channel head and the network.

6 is a scenario diagram illustrating a data transmission scenario for a single base station based MTC communication, in accordance with an embodiment of the present invention.

Acknowledgment (ACK) of packet transfer from the network 601 or disallowance of packet transfer (NACK) is received via a dedicated channel established between the cluster head 701 (see FIG. 7) and the network (eNb) 601 . The cluster head 701 then relays an ACK / NACK message from the network to each MTC device

7 is a flowchart illustrating a message sequence for communication based on MTC dedicated connection according to an embodiment of the present invention. Each of the one or more MTC device / cluster members (CM-1 701a, CM-2 701b and CM-3 701c) is connected to the selected cluster head 701 The channel head 701 generates a priority list of active MTC devices based on the delay tolerance, and the channel head 701 generates a priority list of the active MTC devices based on the delay tolerance The delay tolerance is defined as the total allowed communication time without affecting the quality of service for the MTC member device. The cluster head 701 compares the time required to establish a connection with the base station and the delay tolerance of active MTC devices And triggers a connection request with the base station if the delay tolerance for the MTC device of the higher priority is equal to the preset time. The head 701 also determines the availability of network resources for data traffic transmission based on the buffer occupancy state of the plurality of MTC devices and establishes a dedicated connection with the base station for data traffic transmission. The cluster head 701 transmits at least one of an ACK or NACK message from the base station through a dedicated connection established between the cluster head 701 and the base station 701 and transmits at least one of ACK or NACK messages from the base station to the corresponding MTC device.

8 is a schematic diagram of a timing diagram for MTC dedicated connection based communication, in accordance with an embodiment of the present invention. The timing diagrams depict various activities or operations performed by each of the cluster members or MTC devices, cluster heads and networks, and their time instances.

9 is a scenario diagram illustrating a data transmission scenario for multiple base station dedicated connection based communication for MTC devices, in accordance with an embodiment of the present invention. According to an embodiment of the present invention, the following factors are considered according to the specification for the clustering procedure in a multi-station based scenario. Where N i is the total number of MTC devices in the system and Ni is the number of devices in cluster i. Ni devices are connected to local communication using a single hop. It is assumed that the near-field technology that indicates the range of transmission between the devices is the metric TR. Among the Ni devices are an S device serving a safety application, a P device serving a periodic application, an NP device serving an aperiodic application, and a D device serving non-real-time and real-time applications. Each CHi keeps four queues for each application S, P, and NP D, one at a time. The MTC device may be in any one state, such as a cluster member (CLM) or a cluster head (CH). The MTC device may be either an active device with its own application executing service requests for data transmission or reception, or a passive device without current data transfer.

BSj, BSj + 1 ... Consider BSm as a base station in the system (where j = 1, 2, ... m). CHi is within the coverage range of a number of base stations BSk, where k? {J + 1, j + 2 ... m}. The method for selecting the cluster head considers four main parameters: device mobility, device drain rate, signal-to-noise ratio, and passive device. The weight factor is selected according to each metric based on system requirements and is effectively combined with system parameters. The method uses a combined weight metric of the four parameters described above to select the cluster head. The MTC apparatus having the highest weight is selected as the cluster head 701. To determine the SINR parameter, any device that is closer to the BS will be assumed to have a good SINR value and a high data rate and will be selected as a candidate for CH. In a multiple base station scenario, BSj with CHi having a larger SINR value is selected as the master BS. The remaining BS BSs covering CHi are considered as auxiliary BSs. The ranking table is generated by CHi having a list of BSs sorted into descending order of SINR (SINR) values. The first BSj in the list is the master BS, and the second BSj + 1 is the first auxiliary base station. This list will cover the entire base station that the CHi has jurisdiction. Also, the group of auxiliary base stations, called "candidate serving base stations, " is determined by the SINR ranking table, the QoS requirements of CHi, and resource availability at each secondary BS. For delay non-sensitive applications, a low SINR is acceptable, except that the SINR of the delay sensitive application takes precedence. Thus, all cooperation of the BS should be based on the characteristics of the application.

여기서 CHi 열에서 패킷의 도달 레이트의 합은 BSj에 의해 CHi로 제공된 평균 서비스 레이트보다 작거나 같아야 한다. Rai를, CHi, δS, δP, δNP 및 δD에 할당된 리소들이고, S, P, NP 및 D 애플리케이션에 대한 지연 허용오차, 및 E(DELa)를 애플리케이션에 대한 예상된 지연이라고 한다 (여기서, a ∈ {S, P, NP, D}). 이는 클러스터 헤드에서 큐잉 지연(queuing delay), 전송 지연 및 전파 지연의 합으로서 정의된다.The master base station together with the candidate auxiliary base station forms a virtual cell for CHi. The CSI (CQI / PMI / RI) of the UE is exchanged between the base stations of the virtual cell for co-ordination between the base stations. Ri is regarded as a data rate in units of bits / second between CHi and BSj. The rate Ri is determined based on the physical channel conditions between CHi and BSj, and lambda 1, lambda 2 ... lambda NI is the mean arrival rate at the devices served by Chi, and the arrival rate is Poisson process) and μi is the mean service rate for CHi provided by BSj.

Where the sum of the arrival rates of the packets in the CHi column must be less than or equal to the average service rate provided by CHj to BSj. Rai are the resources allocated to CHi, delta S, delta P, delta NP and delta D, the delay tolerance for the S, P, NP and D applications, and E (DELa) ∈ {S, P, NP, D}). This is defined as the sum of queuing delay, transmission delay and propagation delay at the cluster head.

a. E (DELa) for each application type must satisfy the following constraints:

a. E (DELS)?? S

b. E (DELP)?? P

c. E (DELNP) ≤

d. E (DELD) < = D

b. β S, β P, β NP and β D are referred to as packet loss ratio tolerances for the S, P, NP and D applications.

c. The EPLR (.) Is defined as the expected packet loss rate of the application and is defined as the ratio of the number of lost packets to the total number of packets transmitted.

d. The EPLR (.) For each application type must meet the following constraints:

a. EPLR (S)?? S

b. EPLR (P) < / = P

c. EPLR (NP)?? NP

d. EPLR (D)?? D

는 CHi에서 대기열들이 경계없이 증가하여 E (DEL_a)및 EPLR의 증가를 초래함을 의미한다. CHi의 주위에 클러스터 헤드 또는 서브 클러스터 헤드 중 어느 하나로부터 기지국 세트로의 전용 연결이 있을 것이다. 클러스터 장치는 서빙 또는 마스터 기지국으로부터 전송을 위한 리소스를 얻는다.In such a scenario, the average arrival rate of packets at the CH _i is greater than the service rate at a CH _i.

Means that queues in the CHi increase without bounds, resulting in an increase in E (DEL _a ) and EPLR. There will be a dedicated connection from the cluster head or sub-cluster head to the base station set around CHi. The cluster device obtains resources for transmission from the serving or master base station.

The secondary cluster device CMk (where k ∈ {1, 2 ... n}) is associated with a particular BSk (where k ∈ {j + 1, j + 2 ... m} Are grouped into subclusters (a group of sub-clusters), and the BSk (where k? {J + 1, j + 2 ... m}) is assumed to be descending in the SINR received by the cluster head CHi. The grouping of subclusters in a cluster includes congestion level based subcluster formation and SINR based subcluster formation.

10 is a schematic diagram showing load index and SINR-based index sub-cluster information according to an embodiment of the present invention. In network-assisted grouping, the network BS _j provides information on the congestion level of the base station BS _k (where k ∈ {j + 1, j + 2 ... m}). In accordance with the information provided by the network, the congestion level based grouping is based on the information of the load index (LI) of BS _k of the base station, where k? {J + 1, j + 2 ... m}. By definition, the load index provides a time average occupancy of physical resources at each base station. The primary network BS _j requests the load index from the auxiliary base station through the BACK HAUL link and transfers it to the CH (CHi), and calculates the load index value LI _k (where k ∈ {j + 1, j + 2 ... m} corresponds to the auxiliary BS through dedicated connection. The load index of a particular BS (LI, release ratio for allocated resources) is calculated considering the time averages of the 'n' samples of load index samples at specific time intervals.

If the load index of any network {(LI) retrieved} is too small, that is, if the network is too congested, it is difficult to provide resources to the MTC device. If the load index {(LI) retrieved} is very large, that is, very few devices use the network. For power optimization purposes, it is necessary to interrupt power to these base stations. MTC devices should not be assigned to the network if the load factor is very small or very large. Instead, movement of the current device to another base station helps to shut down the serving base station. If the load index value LIk (where k? {J + 1, j + 2 ... m}) is greater than the (Th) max load index or less than the (Th) min load index, , The threshold Th will be defined for the load index values.

When assigning an MTC device to a particular BS, the load index value LIk (where k ∈ {j + 1, j + 2 ... m}) shall be in the following range.

(Th) min load index <LIk <(Th) max load index (where k? {J + 1, j + 2 ... m}

The base station with the lowest congestion level is assigned a priority over the number of cluster units according to the load index (LIk) of the base station, and the units are selected based on the SINR values for the BS. The secondary MTC apparatuses in the cluster are assumed to transmit SINR values corresponding to all of the auxiliary base stations to the cluster head. The SINR values for the BSs of the devices may be as shown in Table 1.

Grouping of auxiliary MTC devices is performed at the cluster head:

If there are n MTC devices to be grouped at the base station, BSk (where k ∈ {j + 1, j + 2 ... m}) are grouped so that they are arranged in ascending congestion level order with information of the load index.

BSj + 1 → (LIj + 1) MTC devices

BSj + 2 → (LIj + 2) MTC devices

BSj + 3 → (LIj + 3) MTC devices

:

:

BSm → (n - ((LIj + 1) + (LIj + 2) + ... + (Lim-1)))

(CL) j + 1 < (CL) j + 2 < (CL) j + 3 < <(CL) m, and (Th) min load index <LIk (where k ∈ {j + 1, j + 2 ... m}) <(Th) max load index.

In addition, a trigger condition is added. The device CMk (k ∈ {1, 2 ... n}) first allocates to the BS having the lowest congestion BSj + 1 according to the SINR values for the base station. The number of allocated devices is the load index of BS (LIj + 1). Likewise, BSk of all BSs are assigned to secondary MTC devices in such a way that the BSk base station with the lowest congestion level moves first after being initially allocated. MTC devices are grouped into sub-clusters SCk (where k? {J + 1, j + 2 ... m}) based on SINR values corresponding to load index information of other BSKs and BSs. Since the load index of the BS continuously changes, the grouping of the devices needs to be updated corresponding to the new load index values of the BS. The next time interval (Tnew LI) and the grouping after the new load index is retrieved needs to be updated according to the scheduling mechanism.

Case 1 - LI new> LI previous

If the new load index LInew of a particular BS (BSj + 1) is greater than the number of devices assigned to it (previous load index), then it can allocate resources to more devices.

 (LInew) < (Th) max load index

In this case, (BSj + 1) can be allocated to more MTC devices, and MTC devices are allocated to base stations BSM and BSM-1 with high congestion for LIm, and LIm- The exponent is assigned to this base station BSj + 1.

Grouping can be done as follows. That is, 'n' MTC devices are grouped in the BSk of the BS (where k? {J + 1, j + 2 ... m}) j and the load index LIk, + 2 ... m}, the BSj + 1 may be further allocated to the 'x' devices.

             (BSj + 1)? ((LIj + 1) + x)

             (BSj + 2)? (LIj + 2) MTC device

                 :

                 :

              (Lim-1) - (Lim-1) MTC device

              (BSm)? ((LIm) - (LIm)) MTC device

 (CL) j + 1 < (CL) j + 2 < (CL) j + 3 < &Lt; (CL) m, and the x devices may be devices assigned to BSm-1 and BSm.

BSm-1 and BSm are removed from the cloud cell for this cluster, as previously allocated devices are now assigned to BSj + 1.

Case 2 - LI new <LI previous and LI new <(Th) min Load factor

If the load index LInew detected in a particular BS BSj + 1 is smaller than the previous load index LI previous, the load index LInew is calculated for all MTC devices previously assigned to BS BSj + 1 Resources can not be allocated efficiently. In this case, since the number of MTC devices allocated to BS (BSj + 1) is much larger than the resources that can be allocated to MTC devices, it is then assumed that the BS should have a larger load index than the resources allocated to it , The extra MTC devices capable of creating congestion on this BS will be shifted to the next BS.

If BS next to BSj + 1 also have a lower load index than needed, then the devices from BSj + 1 and BSj + 2 will move to BSj + 3.

Grouping can be done as follows. That is, if 'n' MTC devices are grouped in the BSk of the BS (where k ∈ {j + 1, j + 2 ... m}) j and the congestion sequence increases in accordance with the load index , And BSj + 1 may allocate 'x' devices among the previously allocated devices.

(BSj + 1)? ((LIj + 1) -x)

(BSj + 2)? ((LIj + 2) + x)

                 :

                 :

(BSm)? (LIm) MTC device

(CL) j + 1 < (CL) j + 2 < (CL) j + 3 < <(CL) m, (LI) New → (LIj + 1) - x, and BSj + 1 can allocate the x devices to BSj + 2.

Case 3 - LInew> (TH) max load index

(Lnew) retrieved from a particular BS (Bj + 1) is higher than the maximum bound of the load index, i. E., Includes very few devices. In this case, assuming that (BSj + 1) has a load index greater than the upper bound of the load index, the MTC apparatuses associated with this BS, assuming that the next BS should have a load index greater than the previous value It will move to the next BS (as proposed by 3GPP) for power optimization. In such a case (BSj + 1), the power may be terminated to optimize the BS power. BS j + 1 and BS j + 2 to BS j + 3 if BS also has a load index greater than the threshold value. Grouping can be done as follows. That is, if 'n' MTC devices are grouped in the BSk of the BS (where k ∈ {j + 1, j + 2 ... m}) j and the congestion sequence increases in accordance with the load index , The MTC devices associated with BSj + 1 will move to BSj + 2 for power optimization.

(BSj + 1)? ((LIj + 1) - (LIj + 1)

(BSj + 2)? ((LIj + 2) + (LIj + 1)

                 :

                 :

(BSm) - &gt; (LIm) MTC devices

(CL) j + 1 < (CL) j + 2 < (CL) j + 3 < &Lt; (CL) m, and (LI) New > (TH) max load index.

SINR based sub cluster formation (SINR based sub cluster formation)

If there is no information of the load index values of the BS from the network then the subcluster SCk (where k? {J + 1, j + 2 ... m} 1, j + 2, ..., m). CHi corresponds to the auxiliary MTC devices CMk (where k? {1, 2, ..., n}) corresponding to BS's BSk (where k? {J + 1, j + 2 ... m} And then divides the MTC devices into subclusters. The MTC devices of the formed sub-cluster (sub-cluster member) will have high SINR values corresponding to the particular BS assigned to them and the sub-cluster head sCHk, where k? {J + 1, j + ) Is also allocated to each sub-cluster SCk (where k? {J + 1, j + 2 ... m}) to perform contention resolution in the sub-cluster. The conditions for a cluster device to be a sub-cluster head will be the same as previously described in the cluster formation model for a single BS.

(j + 1, j + 2, ..., m) for the active devices in that subcluster. . m)} to the associated BS through a dedicated connection.

The grouping based on the SINR values for the auxiliary base station can be illustrated by the following example. It is assumed that '6' secondary MTC devices and '3' secondary BS and SINR values are shown in the cluster. The SINR values for the BSs of the respective devices may be as shown in Table 2.

(BS1) - &gt; {(SINR) _1,1 ; (SINR) _2,1 ; (SINR) _3.1 ; (SINR) _6,1 ; (SINR) _4,1 ; (SINR) _5,1}

(BS2) - &gt; {(SINR) _2,2 ; (SINR) _5,2 ; (SINR) _6.2 ; (SINR) _1,2 ; (SINR) _3,2 ; (SINR) _4,2 }

(BS3)? {(SINR) _4,3 ; (SINR) _3,3 ; (SINR) _2,3 ; (SINR) _1,3 ; (SINR) _5,3 ; (SINR) _6,3 }

The above example shows the SINR values corresponding to BS-1, BS-2 and BS-3, respectively, in descending order for BS-1, BS-2 and BS-3.

Device 1? {(SINR) _1,1 ; (SINR) _1,2 ; (SINR) _1,3 }

Device 2? {(SINR) _2,2 ; (SINR) _2,1 ; (SINR) _2,3 }

Device 3? {(SINR) _3,3 ; (SINR) _3.1 ; (SINR) _{3, 2} }

Device 4? {(SINR) _4,3 ; (SINR) _4,1 ; (SINR) _4,2 }

Device 5? {(SINR) _5.2 ; (SINR) _5,3 ; (SINR) _5,1}

Device 6? {(SINR) _6,2 ; (SINR) _6,1 ; (SINR) _6,3 }

The above example shows the SINR values for each BS of the devices in descending order.

Grouping based on SINR values for the auxiliary base station may be performed by 'AND'ing the sets shown in each of the above examples.

A group is formed based on a sequence of SINR values corresponding to a base station and a device:

           (BS) 1 → {device 1}

           (BS) 2 → {device 2, device 5, device 6}

           (BS) 3 → {device 4, device 3}

Devices 1, 2, and 4 are sCHs of the subclusters formed corresponding to the respective base stations 1, 2, and 3 because they have the highest SINR value corresponding to that BS. After grouping into any of the above methods, a grouping information message is transmitted from the cluster head CHi to all MTC devices.

Grouping information message: (BSK of the secondary BS, where k? (J + 1, j + 2 ... m)})

Device-coupled sub-cluster head to BS

{CM2, CM3, ... , CMm} BSj + 1 sCHj + 1 CM2

{CM1, CM5, ... , CMp} BSj + 2 sCHj + 2 CM1

       :

       :

{CMi, CM21, ... , CMz} BSm sCHm CMi

Hybrid Grouping:

Based on simultaneous optimization of SINR and load balancing, hybrid grouping is left for future work that is not within the scope of this document. Once the grouping is complete, there are two ways in which a dedicated channel from a sub-cluster to each base station can be formed with dedicated connections based on CH-based dedicated connections and sub-cluster heads (sCH), for example.

11 is a diagram illustrating a data transmission scenario through cluster head dedicated connection based communication of an MTC apparatus to a plurality of base stations according to an embodiment of the present invention. In a CH-based connection, there will be a dedicated connection from CHi to a plurality of base stations {BSK, where k ∈ (j + 1, j + 2 ... m)} and all communications from sub- Head. Each of the MTC devices in the cluster will update CHi with its activation information. The contention resolution of each sub-cluster will be handled in the CHi, that is, the CH will thereby request resources from a particular base station whenever transmission is ready for any sub-cluster device. There is likely to be congestion at each base station, and the sub-cluster devices do not have resources for communication and thus a disruption occurs in the MTC device. Each base station will have a secondary base station ('n' secondary BSs) capable of handing over the devices whenever there is a possibility of a disruption in the M2M communication. The device CM1 shifts from the sub-cluster corresponding to the serving BS (BS-2) to the sub-cluster corresponding to the secondary BS (BS-3). The shifting occurs when half of the delay tolerance interval and the device CM1 can not obtain the resources associated with the base station BS (BS-2). The secondary BS (BS-2) can notify the cluster head of the secondary BS (BS-3) and the devices (CM-1) corresponding to the subcluster can shift.

12 is a schematic diagram of a timing diagram for communication based on dedicated base station cluster head dedicated connection to an MTC device, in accordance with an embodiment of the present invention. Each of the MTC devices in the cluster will update the cluster head to the active state. Accordingly, the cluster head will request resources from a particular base station whenever a transfer is ready for any subcluster device. There is a possibility of congestion at each base station and a break occurs in the MTC because the sub-cluster device does not have resources for communication. The cluster head will then hand over the MTC devices from the first base station to the second base station if they do not have network resources in the first half of the delay tolerance. In addition, the second base station requests resources from the network that keeps the MTC devices at a high priority.

Figure 13 is a flow diagram illustrating a messaging sequence for cluster head dedicated connection based communication to an MTC device, in accordance with an embodiment of the present invention. The cluster head 701 notifies a plurality of MTC apparatuses to the cluster of the main base station 1301a to which each MTC apparatus is allocated. When the MTC apparatus is activated, the MTC apparatus updates the active state for each cluster head 701. Then, the cluster head 701 requests network resources from a specific base station whenever transmission to the sub-cluster MTC apparatus is ready. Next, the cluster head 701 requests the main base station (BS-2) 1301a to provide the auxiliary base station (BS-3) 1301b in case of interruption in communication due to the unavailability of network resources . The main base station 1301a notifies the cluster head 701 that the auxiliary base station 1301b can perform MTC communication. Then, the cluster head 701 transmits one or more MTC devices from the sub-cluster corresponding to the main base station (BS-2) 1301a to the sub-cluster corresponding to the sub-base station (BS-3) 1301b, Move to the cluster. If more than half of the delay tolerance associated with one or more MTC devices and the MTC device can not obtain the network resources associated with the base station, a migration occurs. Then, the cluster head 701 queries the auxiliary base station (BS-3) 1301b for network resources and initiates data communication with the MTC devices.

FIG. 14 is a scenario diagram illustrating data transmission through communication based on a sub-cluster head dedicated connection for an MTC apparatus to multiple base stations according to an embodiment of the present invention. In a subclass head (sCH) -based dedicated connection, a sub-cluster head sCHk of a specific sub-cluster SCk (where k ∈ (j + 1, j + 2 ... m) + 2 ... m)} to the associated base station. Since the dedicated connection is from the sCH to the base station, contention in each subcluster is handled at the sCH of the subcluster. The sCH immediately initiates a connection request for resources to the associated base station as soon as any UE in the subcluster is activated.

The CHi after the subcluster grouping transmits all information messages (grouping information of the secondary MTC apparatus) to all the MTC apparatuses so that each MTC apparatus knows which BS is associated with which apparatus. Each of the sCHs knows information on sCH's corresponding to other base stations (BS's). A handover message from a specific sCH (sCH1) to another sCH (sCH2) includes information of MTC devices to be handed over. The grouping information transmitted from each CHi to each of the MTC devices includes information as provided below.

Device-coupled sub-cluster head to BS

{CM2, CM3, ... , CMm} BS _{j + 1} sCH _{j + 1} CM2

{CM1, CM5, ... , CMp} BS _{j + 2} sCH _{j + 2} CM1

In the sCH based connection, the delay tolerance is updated to half of the original value for communication from the assigned primary BS. If the delay tolerance is exceeded and the MTC device still does not receive any resources at the associated BS (in the case of associated BS congestion), it will be handed over to the secondary BS for the resources. A secondary BS corresponding to each BS will be selected for handover of the device. sCH (SCH1) will send information about the device (sCM1) requesting resources for communication on the sCH (sCH2) corresponding to the auxiliary base station (BS3). The sCH (sCH2) handover the handover MTC devices sCM1 as sub-cluster members and initiates a request for resources from the base station.

15 is a flowchart illustrating a messaging sequence for communication based on subcluster head dedicated connection to an MTC device, in accordance with an embodiment of the present invention. The cluster head 701 notifies a plurality of MTC apparatuses in the cluster of grouping information that a certain base station is assigned to an MTC apparatus. The activation MTC device notifies the subcluster head of its activation status. The sub-cluster head requests a network resource from a specific base station whenever transmission to the sub-cluster MTC apparatus 1303 is prepared. The sub-cluster head requests the auxiliary base station (BS-3) 1301b if half of the delay tolerance is delivered and no resources are found for the MTC. Next, the main base station 1301a provides information of the auxiliary base station 1301b from which the sub-cluster head (sCH2) 1501 can initiate the MTC. Next, the sub-cluster head (sCH2) 1501 searches in the grouping information for the sub-cluster head connected to the auxiliary base station 1301b. Then, the subcluster performs handover of the MTC apparatus from the subcluster corresponding to the main base station 1301a to the subcluster 1501b corresponding to the auxiliary base station 1301b, as proposed by the network 601 . The sub-cluster head 1501 of the auxiliary base station 1301b indicates to which sub-cluster one or more MTC devices can move. Then, the sub-cluster head 1501b starts transmitting data traffic from one or more MTC devices to the auxiliary base station 1301b through the connection established between the sub-cluster head 1501b and the auxiliary base station 1301b.

According to an embodiment of the present invention, when more than half of the delay tolerance associated with one or more MTC devices and the MTC device does not have network resources associated with the base station, the sub-cluster head 1501b requests the auxiliary base station 1301b. Each sub-cluster head serving one or more associated MTC devices is connected to the serving base station via a dedicated connection.

According to an embodiment of the present invention, the MTC apparatuses of one sub-cluster are connected to each other when the delay tolerance of the MTC apparatus expires and when the MTC apparatus is in a sub-cluster having no resources from the associated base station, Clusters through at least one of at least one of the cases where the MTC device can not serve the MTC device in the sub-cluster via device to device communication.

16 is a schematic diagram of a timing diagram for communication based on dedicated base station sub-cluster head dedicated to MTC devices, in accordance with an embodiment of the present invention. As shown in FIG. 16, at t1, the sub-cluster head transmits grouping information to each of the cluster heads that transmit grouping information to each sub-cluster head. At t2, the MTC device of subcluster 2 is activated for communication. At t5, more than half of the grant delay and no resources are allocated from the network. At t6, the primary base station requests the secondary base station. At t8, the network notifies the sub-cluster head 2 of the sub-cluster head 2 so that the sub-cluster devices can be moved to the sub-cluster 3. Further, at t8, the sub-cluster head-2 retrieves the grouping information for the sub-cluster head corresponding to the base station. At t9, the sub-cluster head-2 hands over the server cluster devices to the sub-cluster head-3 as suggested by the network. At t11, the handover device obtains network resources from the auxiliary base station.

According to the present embodiment, the clustering-based mechanism provides a cluster head for establishing a dedicated connection with the eNB and other MTC devices for communicating only with the cluster head and not with the base station. Also, a semi-persistence scheduling grant is assigned to the cluster head, and the cluster head receives downlink data on behalf of all MTC devices. Then, the MTC cluster head shares the MTC downlink data with each MTC device.

It will be apparent that the embodiments have been described with reference to specific exemplary embodiments, and that various modifications and changes may be made to these embodiments without departing from the broader spirit and scope of the various embodiments.

601: Network 701: Cluster Head
701a: Cluster member-1 1301a: Primary base station
1301b: auxiliary base station 1303: subcluster MTC device

Claims (28)

A method for providing data communication for a machine type communication (MTC) device in a group-based wireless communication,
Receiving, by the cluster head, a data traffic transfer request from one or more MTC devices;
Determining availability of one or more network resources to transmit the data traffic; And
Establishing a dedicated connection with the base station for transmission of data traffic from the one or more MTC devices to the base station based on availability of the one or more network resources by the cluster head;
&Lt; / RTI &gt; 2. The method of claim 1, wherein the data transfer request comprises at least one of an activation state, a buffer occupancy status, and a delay tolerance of the one or more MTC devices. 3. The method of claim 2, wherein the determining the availability of base station resources for transmitting the data traffic comprises:
Generating a priority list of active MTC devices based on the delay tolerance;
Comparing the delay tolerance of the active MTC devices with a time required for establishing a connection with the base station; And
And triggering a connection request with the base station if the delay tolerance for a high priority MTC device is equal to a preset time;
Wherein the delay tolerance is a total allowed communication time that does not affect the quality of service for the MTC device. The method according to claim 1,
Transmitting at least one of an ACK or NACK message from the base station through the dedicated connection established between the cluster head and the base station by the cluster head; And
Further comprising relaying at least one of an ACK or NACK message from the base station to a corresponding MTC device. 2. The method of claim 1, wherein the cluster head establishes and releases the dedicated connection with the base station based on traffic input from the one or more MTC devices. 4. The method of claim 3, wherein the predetermined time is a time interval required for establishing a dedicated connection between the cluster head and the base station. The method according to claim 1,
Further comprising performing sub-clustering of the plurality of MTC devices in a cluster based on a first set of parameters,
Wherein the first set of parameters comprises a congestion level and a signal-to-noise ratio (SINR) associated with the plurality of MTC devices. 8. The method of claim 7,
Wherein the congestion level based sub-cluster formation is performed based on a load index, and wherein the load index is an average of resource utilization at the base station. 9. The method of claim 8,
Calculating the load index of the selected base station; And
Further comprising redirecting one or more MTC devices from the first base station to the second base station if the load index of the second base station is greater than the previous load index and less than the maximum load index,
Wherein the maximum load factor is associated with maximum availability of network resources. 9. The method of claim 8,
Load MTC devices from the first base station to a load factor between the maximum load index and the minimum load index when the load index of the first base station is less than the previous load index and less than or equal to the minimum load index, Further comprising redirecting to a second base station,
Wherein the minimum load factor is associated with a minimum availability of the network resources. 9. The method of claim 8,
Redirecting one or more MTC devices from the first base station to the second base station if the load index of the first base station is greater than the maximum load index; And
And shutting down the primary base station. 8. The method of claim 7,
The SINR-based subcluster forming operation includes:
Measuring, by each MTC device, an SINR for each base station;
Reporting the SINR value to a serving base station;
Sharing an SINR report with a plurality of neighbor base stations by the serving base station;
Sorting, by each base station, the reported SINR for the one or more MTC devices for each base station; And
Generating a sub-cluster based on a common SINR sequence for the one or more MTC devices for each base station. 8. The method of claim 7, wherein the cluster head has a decreasing order of SINR (SINR) for neighboring base stations or cooperative base stations that have the highest SINR with the serving cell and jointly serve the cluster head. A method for providing data communication for a machine type communication (MTC) device to multiple base stations in a wireless communication, the method comprising:
Notifying, by the cluster head, the primary base station to which each MTC device is assigned to one or more MTC devices in the cluster;
Updating the activation state of the one or more MTC devices to the cluster head by each of the MTC devices;
Requesting a network resource from a particular base station whenever transmission to the sub-cluster MTC apparatus is ready;
When the communication is interrupted due to unavailability of network resources, the main base station requests the auxiliary base station;
Shifting one or more MTC devices from a sub-cluster corresponding to the primary base station to a sub-cluster corresponding to the auxiliary base station, wherein the shifting operation is performed by shifting half of the delay tolerance associated with the one or more MTC devices And the MTC device does not have the network resources associated with the base station; And
And notifying by the cluster head of the subsidiary station that the one or more MTC devices corresponding to the subcluster are capable of shifting. A method for providing data communication for a machine type communication (MTC) device to multiple base stations in a wireless communication, the method comprising:
The subcluster head informing the one or more MTC devices in the cluster of the primary base station to which each MTC device is assigned;
Each of the MTC apparatuses updating the active state of the MTC apparatus to the sub-cluster head;
Requesting a network resource from a particular base station whenever transmission to the sub-cluster MTC apparatus is ready;
Requesting a secondary base station if the primary base station is unable to use network resources and there is a communication disruption;
Providing information of the sub-base station from which the sub-cluster head can initiate MTC communication;
Retrieving the sub-cluster head connected to the auxiliary base station from the grouping information;
Moving the one or more MTC devices from a sub-cluster corresponding to the main base station to a sub-cluster corresponding to the auxiliary base station;
An operation of informing by the sub-cluster head of the auxiliary base station that one or more MTC apparatuses corresponding to the sub-cluster can move; And
Initiating a data traffic transmission from the one or more MTC devices to the secondary database through a connection established between the subcluster head and the secondary base station. 15. The method of claim 14 wherein the sub-cluster head requests the auxiliary base station if more than half of the delay tolerance associated with the one or more MTC devices and the MTC device does not have the network resources associated with the base station. 15. The method of claim 14,
Providing information of the one or more MTC devices requesting network resources to the sub-cluster corresponding to the auxiliary base station;
Storing the one or more MTC devices requesting network resources as sub-cluster members; And
And requesting network resources from the auxiliary base station by the sub-cluster head. 15. The method of claim 14,
Wherein each sub-cluster head serving one or more associated MTC devices is connected to the serving base station via a dedicated connection. 15. The method of claim 14,
Providing grouping information of auxiliary MTC devices to the plurality of MTC devices in the cluster, the grouping information informing the MTC device which base station is associated with which MTC device; And
Further comprising enabling the MTC devices in one subcluster to connect to another subcluster via one or more MTC devices using device to device communication. 19. The apparatus of claim 18, wherein the MTC devices of the one sub-
The delay tolerance expiration of the MTC device and the MTC device are in a subcluster that does not have resources from the associated base station; And
When the sub-cluster head connected to the macro base station can not serve the MTC apparatus in the sub-cluster
Lt; RTI ID = 0.0 &gt; d2d &lt; / RTI &gt; A method for providing data communication for a machine type communication (MTC) device in group-based wireless communication, comprising:
Selecting at least one cluster head for a plurality of clusters, each of the plurality of clusters comprising one or more MTC devices that are members of a cluster associated with the cluster head;
The cluster head receiving a message from the one or more MTC devices for data traffic transmission if the one or more MTC devices are active, the message comprising an activation state, a buffer occupancy state and a delay tolerance of the one or more MTC devices, - &lt; / RTI &gt;
Determining availability of network resources for transmitting the data traffic based on the buffer occupancy state of the one or more MTC devices;
Establishing a dedicated connection with the base station for transmitting the data traffic; And
And transmitting data traffic from the one or more MTC devices to the base station via a connection established between the cluster head and the base station,
Wherein the delay tolerance is defined as a total allowed communication time that does not affect service quality for the MTC member device. A system for providing data communication for a machine type communication (MTC) device in group-based wireless communication, comprising:
The system comprises:
Selecting at least one cluster head for a plurality of clusters, each of the plurality of clusters comprising one or more MTC devices that are members of a cluster associated with the cluster head;
Wherein the message comprises at least one of an activation state, a buffer occupancy state, and a delay tolerance of the one or more MTC devices when the at least one MTC device is activated, ;
Determine availability of network resources for the data traffic transmission based on the buffer occupancy state of the one or more MTC devices;
Establishing a dedicated connection with the base station to transmit the data traffic; And
To transmit the data traffic from the one or more MTC devices to the base station via a connection established between the cluster head and the base station
At least one network element configured,
Wherein the delay tolerance is defined as total allowed communication time that does not affect service quality for the MTC member device. 22. The apparatus of claim 21, further comprising at least one element configured to perform sub-clustering of the plurality of MTC devices in a cluster based on a first set of parameters,
Wherein the first set of parameters comprises a congestion and a signal-to-noise ratio (SINR) associated with the plurality of MTC devices. A system for providing data communication for a machine type communication (MTC) device for multiple base stations in a wireless communication, the system comprising:
The system includes a cluster head,
The cluster head includes:
Informing one or more MTC devices in the cluster of the primary base station to which each MTC device is assigned;
Request network resources from a particular base station whenever transmission to a sub-cluster MTC device is ready;
If communication is interrupted due to unavailability of network resources, the primary base station requests a secondary base station;
Clusters corresponding to the primary base station and shifting one or more MTC devices from the sub-cluster corresponding to the primary base station to sub-clusters corresponding to the auxiliary base station, wherein the shifting is over half of the delay tolerance associated with the one or more MTC devices, Occurs when the mobile station does not have the network resources associated with the base station; And
And to inform the auxiliary station that the one or more MTC devices corresponding to the subcluster can move. A system for providing data communication for a machine type communication (MTC) device for multiple base stations in a wireless communication, the system comprising:
The system includes a sub-cluster head,
The sub-
Notifying one or more devices in the cluster of the primary base station to which each MTC device is assigned;
Request network resources from a particular base station whenever transmission to a sub-cluster MTC device is ready;
Requesting a supplementary base station if the main base station has a communication interruption due to the inability to use network resources;
The sub-cluster head providing information of the auxiliary base station capable of starting MTC communication;
Searching the grouping information for the sub-cluster head connected to the auxiliary base station;
Shifting the one or more MTC devices from a sub-cluster corresponding to the primary base station to a sub-cluster corresponding to the secondary base station;
Notify by the sub-cluster head of the auxiliary base station that one or more MTC apparatuses corresponding to the sub-cluster can move; And
And to initiate data traffic transmissions from the one or more MTC devices to the secondary database via a connection established between the subcluster head and the secondary base station. 25. The sub-cluster head according to claim 24,
Providing information of the one or more MTC devices requiring network resources to the sub-cluster corresponding to the auxiliary base station;
Storing the one or more MTC devices requiring network resources as sub-cluster members;
Requesting network resources from the auxiliary base station by the sub-cluster head;
Providing grouping information of auxiliary MTC devices to the plurality of MTC devices in the cluster, the grouping information informing the MTC device which base station is associated with which MTC device; And
Wherein the MTC devices of one subcluster are further configured to be connectable to other subclusters via one or more MTC devices using d2d communication. 25. The system of claim 24, wherein each sub-cluster head serving one or more associated MTC devices is connected to the serving base station via a dedicated connection. A system for providing data communication for a machine type communication (MTC) device in group-based wireless communication, comprising:
The system comprises:
Selecting at least one cluster head for a plurality of clusters, each of the plurality of clusters comprising one or more MTC devices that are members of a cluster associated with the cluster head;
Wherein the cluster head receives a message from the one or more MTC devices for transmitting data traffic when the one or more MTC devices are active and the message is one of an activation state, a buffer occupancy state and a delay tolerance of the one or more MTC devices At least one;
Determine availability of network resources for the data traffic transmission based on the buffer occupancy state of the one or more MTC devices;
Establishing a dedicated connection with the base station for transmitting the data traffic; And
Transmitting data traffic from the one or more MTC devices to the base station via a connection established between the cluster head and the base station
Wherein the at least one element is configured to &lt; RTI ID = 0.0 &gt;
Wherein the delay tolerance is defined as a total allowed communication time that does not affect the quality of service for the MTC member device.

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