KR101090543B1 - Method and apparatus for access control of mobile communication relay - Google Patents

Abstract

According to an aspect of the present invention, there is provided a mobile communication repeater comprising: a measuring unit measuring a utilization rate of radio resources in a link between a base station and the mobile communication repeater, an overload determining unit determining whether the link is overloaded based on the utilization rate, In the overload state, a transmitter for transmitting information indicating an overload to at least one terminal is proposed.

Mobile communication, wireless repeater, relay, access control

Description

METHOD AND APPARATUS FOR ACCESS CONTROL OF MOBILE COMMUNICATION RELAY}

The present invention relates to an access control method in a network, and more particularly, to an access control method and apparatus considering a load of a mobile communication repeater.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 2006-S-003-04, Task name: Development of next generation mobile communication service platform] .

Relays improve the cell-edge throughput and increase coverage. In addition, standardization is being considered as an element of the next generation mobile communication system because of the advantages of effectively supporting group mobility and enabling temporary network deployment.

According to the current standard in progress in 3GPP, the relay (relay) is wirelessly connected to the cellular base station, the base station (e-NodeB; eNB) connected to the repeater is called a donor eNB. When a radio path from a general base station to a terminal is called a network-to-UE link, a radio path configured from one donor eNB to a repeater is a network-to-relay link. The radio path set from the repeater to each terminal is called a relay-to-UE link.

The repeater is divided into in-band and out-band according to the frequency resource used by the link between the network and the repeater. In-band relay means a repeater whose network-to-relay link uses the same frequency as the network-to-terminal link, and an out-band relay uses different frequency resources. It means a repeater.

In one embodiment of the present invention, the performance of all existing terminals sharing a link between network-relays is caused by the terminal accessing and using a service additionally to a type-1 repeater using a network-relay link with a heavy load. An object of the present invention is to provide an access control method and apparatus for a mobile communication wireless repeater that can solve the problem.

The mobile communication repeater according to an embodiment of the present invention, a measurement unit for measuring the utilization rate of the radio resources in the link between the base station and the mobile communication repeater, an overload determination unit for determining whether the link is overloaded based on the utilization rate, And a transmitter for transmitting information indicating the overload to at least one terminal when the link is in the overload state.

In addition, the mobile communication terminal according to an embodiment of the present invention, a receiving unit for receiving information indicating that the link between the mobile communication repeater and the mobile communication terminal from the at least one mobile communication repeater, and the information indicating that the overload A mobile communication repeater other than the mobile communication repeater, wherein the mobile communication repeater and the other mobile communication repeater belong to the base station, among the mobile communication repeaters connected to the base station to which the mobile communication terminal belongs. do.

 In addition, the method for controlling a mobile communication relay (mobile communication relay) according to an embodiment of the present invention, measuring the utilization rate of the radio resource in the link between the base station and the mobile communication repeater, the link based on the utilization rate Determining whether is overloaded, and if the link is overloaded, transmitting information indicating overloading to at least one terminal.

In addition, the method for controlling a mobile communication terminal according to an embodiment of the present invention, receiving information indicating that the link between the mobile communication repeater and the mobile communication terminal is overloaded from at least one mobile communication repeater, and the And connecting to a mobile communication repeater other than the mobile communication repeater, wherein the mobile communication repeater and the other mobile communication repeater belong to the base station among mobile communication repeaters connected to the base station to which the mobile communication terminal belongs.

According to an embodiment of the present invention, it is possible to prevent the lack of radio resources of the network-to-relay link occurring in the type-1 relay and the performance degradation of the terminals connected to the repeater.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a wireless network according to an embodiment of the present invention.

Referring to FIG. 1, a repeater currently being standardized may be classified into a type 1 and a type 2.

The type-1 repeater 120 is an in-band repeater equipped with radio resource management and a layer 3 signal message processing function and the like, and has a capability of independently operating its own cell 160 in the same manner as a general base station.

That is, the type-1 repeater 120 broadcasts system information including a unique physical cell ID to the UE 130, and a unique synchronization channel and a reference signal. Broadcasts.

 In addition, it is recognized as an independent base station that is different from the base station (donor eNB) from the viewpoint of the terminal 130 such as operating independent scheduling (scheduling) information and the HARQ process different from the base station (donor eNB) 110.

Accordingly, the terminal 130 may select the type-1 repeater cell 160 using the same procedure and information as that of accessing the general eNB based on the synchronization channel of the type-1 repeater 120 and the system information broadcasted. Type 1 repeater 120.

On the other hand, a type 2 repeater is a repeater that transparently translates and transmits signals up to layer 2 of a donor eNB to a terminal and performs radio resource management and radio resource management, which are inherent to the base station. It refers to a simple repeater without layer 3 signal message processing such as control and independent cell operation.

Therefore, the terminal directly accesses the base station according to the system information broadcast from the base station, and combines the original signal received from the base station and the signal corrected and repeated from the repeater to obtain a signal having improved quality and a reduced error rate. have.

The network-repeater link 170 uses the same radio resources as the repeater-terminal link 180 with the same frequency and bandwidth.

Therefore, if an in-band repeater simultaneously transmits / receives data through these links, self-interference affects data transmission / reception of one link to data transmission / reception of another link. This may cause an error.

The repeater sends and receives data on only one link at a time. According to the current 3GPP TR 36.814 standard, MBMS subframe which is a dedicated radio frame used to transmit data to MBSFN (MBMS Single Frequency Network) terminal as shown in FIG. 2 in order to minimize the influence on the existing LTE terminal. Only data transmission between the eNB and the repeater through the network-relay link is performed.

2 is a diagram illustrating a normal subframe 210 and an MBSFN subframe 230 used in an access control method for a mobile communication wireless repeater according to an embodiment of the present invention.

Referring to FIG. 2, the normal subframe 210 may be used for relay-to-terminal communication, and the MBSFN subframe 230 may be used for eNodeB-repeater communication.

A plurality of terminals 130 may be connected to the type-1 repeater 120, and all data transmitted through the repeater-terminal link 180 between the repeater and each terminal may be connected to one network-relay unit as illustrated in FIG. 3. Relayed via link 170.

3 is a diagram illustrating a network-relay link 320 and a relay-terminal link 340 in an access control method for a mobile communication wireless repeater according to an embodiment of the present invention.

Referring to FIG. 3, the network-relay link 320 and the relay-terminal link 340 have a 1: N correspondence.

As the number of terminals 350 connected to the type-1 repeater 330 increases and the amount of data transmitted and received by the connected terminals increases, the traffic load of the network-relay link 320 increases rapidly. Bottlenecks can occur.

In addition, if the terminal 350 is continuously connected to the type-1 repeater 330 while the bottleneck occurs, and data transmission with the network is performed due to the service of the connected terminal 350, the network-relay This directly affects performance degradation of all existing terminals sharing the link 320.

Moreover, according to the current 3GPP standard, there are constraints as shown in FIG. 4 in the use of the MBSFN subframe.

4 is a diagram illustrating an MBSFN subframe 230 used to transmit data on a network-relay link in an access control method for a mobile communication wireless repeater according to an embodiment of the present invention.

Referring to FIG. 4, subframe # 0 and subframe # 5 in which the eNB broadcasts synchronization channel information to synchronize with the UE may not be used as the MBSFN subframe.

In addition, the use of the subframe # 4 and the subframe # 9 to which the paging message can be transmitted to the terminal is also excluded from the MBSFN subframe.

Therefore, only 60% of the repeated 10 subframes in units of 1 msec can be used as the MBSFN subframe. The limitation of the usable MBSFN subframe may also be a factor in deepening a bottleneck when a plurality of terminals access the type-1 repeater.

5 is a flowchart illustrating an access control method of a mobile communication repeater according to an embodiment of the present invention.

Referring to FIG. 5, the repeater measures the utilization of radio resources used for data transmission in the link between the base station and the mobile communication repeater (eg, the network-repeater link 320 of FIG. 3) (510).

In this case, the utilization rate measurement of the radio resource may be performed periodically every time the subframe is transmitted or every predetermined period such as a predetermined time unit (5 minutes, 10 minutes).

Also, for example, the wireless communication may be performed at a preset time such as an evening time zone and a night time zone where the wireless communication usage rate is high, and may be measured at a predetermined period of the preset time zone.

Here, the repeater is a device for performing wireless relay in communication, and is equipped with a management function of radio resources and a layer 3 signal message processing function and the like as a wireless general base station, and may have an ability to independently operate its own cell. For example, it may include the type-1 repeater described above.

In this case, the radio resource is a terminal that performs a communication function including transmission and reception of data through a wireless network, and may include, for example, a mobile phone, a smart phone, a PDA, a netbook, a notebook, and various terminals having other mobile communication functions. Can be.

When the utilization rate of the various radio resources is measured, the repeater determines whether the link between the network and the repeater is overloaded based on the utilization rate measured in step 510.

The determination of whether the link between the network and the relay is overloaded may be made by comparing the threshold and the utilization measured in step 510.

In this case, the threshold compared with the utilization may be input from the user, or the threshold of the network-relay link previously determined may be preset as the threshold for the comparison.

As a result of the determination in step 530, if the link between the network and the repeater is overloaded, the repeater transmits information indicating the overload to at least one terminal connected thereto (550).

In this case, the repeater may include an indicator indicating an overload in at least one of control channel information and system information broadcast from the mobile communication repeater to at least one terminal every subframe.

That is, for example, the repeater may insert and transmit an indicator indicating whether the system information is overloaded, such as a master information block or a system information block that is periodically broadcasted to its own cell.

In addition, the repeater may insert and transmit an indicator indicating whether the control channel information of the physical layer broadcast to its cell is overloaded in every subframe such as a physical downlink control channel (PDCCH).

At this time, the broadcast of its own cell may be performed periodically, or may be performed whenever necessary.

If the link between the network and the relay is out of the overload state, the repeater removes the indicator indicating the overload inserted in step 550 from the information broadcast to at least one terminal belonging to its cell, thereby overloading the respective terminals. It can inform that is released.

In this case, the terminal that receives the information indicating that the link between the base station and the repeater, that is, the network-relay link, is overloaded from the at least one mobile communication repeater, is other than the mobile communication repeater among the mobile communication repeaters connected to the base station to which the mobile communication terminal belongs. To another mobile communication repeater.

In this case, the mobile communication repeater and the other mobile communication repeater may correspond to the repeaters belonging to the same base station, and the terminal is directly connected to any other accessible repeater or base station other than the corresponding repeater broadcasting the information indicating that the overload condition is wireless. Perform communication.

Thereafter, the terminal may receive information indicating that the overload is released from the repeater, or if the indicator indicating the overload state is removed from the periodically broadcast subframe, the terminal may access the repeater again and perform wireless communication.

6 is a block diagram of a mobile communication repeater according to an embodiment of the present invention.

Referring to FIG. 6, the mobile communication repeater 600 includes a measuring unit 610, an overload determining unit 630, and a transmitting unit 650.

The measurement unit 610 measures the utilization rate of the radio resource in the link between the base station and the mobile communication repeater.

In addition, the measurement unit 610 may measure the utilization rate of the radio resource at a predetermined period or at a predetermined time.

In this case, the utilization rate of the radio resource may be measured periodically every time the subframe is transmitted or at a predetermined period such as a predetermined time unit (5 minutes or 10 minutes), or may be an evening time zone or a night time zone where the radio communication usage rate is high. As described above, the measurement may be performed at a preset time or may be measured at a predetermined period of a preset time zone.

The overload determination unit 630 determines whether the link between the base station and the mobile communication repeater is overloaded based on the usage rate measured by the measurement unit 610.

The overload determination unit 630 may determine whether the link between the base station and the mobile communication repeater is overloaded by comparing the utilization rate with a threshold.

At this time, the threshold compared with the utilization may be input from the user, or may be set in advance as a threshold for the comparison of the threshold of the network-relay link.

The transmitter 650 transmits information indicating the overload to at least one terminal when the link is overloaded.

The transmitter 650 may include an indicator indicating an overload in at least one of control channel information and system information broadcast from the mobile communication repeater to the terminals every subframe.

In addition, when the link between the base station to which the mobile communication repeater belongs and the mobile communication repeater is released from an overload state, the transmitter 650 indicates an overload from at least one of control channel information and system information broadcast from the mobile communication repeater. Can be removed to broadcast.

7 is a block diagram of a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 7, the mobile communication terminal for access control of the mobile communication repeater includes a receiver 710 and a connection 730.

The receiver 710 receives information indicating that the link between the mobile communication repeater and the mobile communication terminal is overloaded from at least one mobile communication repeater.

When the connection unit 730 receives the information indicating that the link between the mobile communication repeater and the mobile communication terminal is overloaded through the receiving unit 710, the mobile communication unit other than the mobile communication repeater among the mobile communication repeaters connected to the base station to which the mobile communication terminal belongs. Connect with a repeater.

In this case, the mobile communication repeater and the other mobile communication repeater may belong to the same base station.

Thereafter, the mobile communication terminal may receive information indicating that the overload state has been released from the repeater, or if the indicator indicating the overload state is removed from the periodically broadcast subframe, the mobile communication terminal may access the repeater again and perform wireless communication. .

In the description of the mobile communication repeater and the mobile communication terminal for access control of the mobile communication repeater in FIGS. 6 to 7, the components, terms, and other parts having the same names are described in FIGS. 1 to 5. See section.

The methods according to the invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the steps of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and various modifications and variations will be made to those skilled in the art to which the present invention pertains. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

1 is a diagram illustrating a wireless network according to an embodiment of the present invention.

2 illustrates a normal subframe and an MBSFN subframe used in an access control method for a mobile communication repeater according to an embodiment of the present invention.

3 is a diagram illustrating a link between a network and a repeater and a link between a repeater and a terminal in an access control method for a mobile communication repeater according to an embodiment of the present invention.

4 is a diagram illustrating an MBSFN subframe used for transmitting data through a network-relay link in an access control method for a mobile communication repeater according to an embodiment of the present invention.

5 is a flowchart illustrating an access control method of a mobile communication repeater according to an embodiment of the present invention.

6 is a block diagram of a mobile communication repeater according to an embodiment of the present invention.

7 is a block diagram of a mobile communication terminal according to an embodiment of the present invention.

Claims (10)

In mobile communication repeater, A measuring unit measuring a utilization rate of a radio resource in a link between a base station and the mobile communication repeater; An overload determining unit determining whether the link is overloaded based on the utilization rate; And If the link is in the overload state, at least one terminal includes information indicating an indicator indicating the overload in at least one of control channel information broadcast from the mobile communication repeater and periodically broadcast system information every subframe. Transmitter to transmit Mobile communication repeater comprising a. The method of claim 1, wherein the measuring unit, A mobile communication repeater for measuring the utilization of the radio resource at a predetermined period or at a predetermined time. The method of claim 1, wherein the overload determining unit, And comparing the utilization with a threshold to determine whether the link is overloaded. delete The method of claim 1, wherein the transmission unit, And removing the indicator indicating the overload from at least one of the control channel information and the system information broadcast from the mobile communication repeater when the link is released from the overload condition. In the mobile communication terminal, If the link between the mobile communication repeater and the mobile communication terminal is overloaded from at least one mobile communication repeater, the overload is applied to at least one of control channel information broadcast from the mobile communication repeater and periodically broadcast system information every subframe. A receiver configured to receive information including an indicator indicating an indicator; And When receiving the information indicating that the overload, a mobile communication repeater other than the mobile communication repeater of the mobile communication repeater connected to the base station to which the mobile communication terminal belongs-the mobile communication repeater and the other mobile communication repeater belongs to the base station- Connecting part to connect Mobile communication terminal comprising a. delete delete delete delete

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